Patent Publication Number: US-2022217226-A1

Title: Terminal device, and display screen and application thereof

Description:
FIELD OF THE INVENTION 
     The present invention relates to the field of electronic devices, and in particular, to a terminal device having a full screen, and a display screen thereof and application thereof. 
     BACKGROUND OF THE INVENTION 
     Current electronic devices usually have a camera function. To this end, conventional mobile phone terminals generally have a front camera module and a rear camera module. The front camera module is provided on the same side of a display screen for meeting the requirements of users for taking a selfie, etc. A front camera module occupies a large screen space, which is contrary to a current trend of pursuing a full screen. 
     The currently adopted measure is to design a camera module as a telescopic camera module so as to hide and use a camera function. When a camera function of an electronic device needs to be used, at least a part of the camera module is controlled to extend out of a housing of the electronic device. When the camera function is finished to be used, at least a part of the camera module is controlled to retract into the housing of the electronic device. However, the camera module is a relatively precise component, the service life of the camera module in a high-frequency back-and-forth motion needs to be tested, and the camera module is likely to be damaged due to the blocking of an external force in a moving process. 
     Therefore, how to ensure a front camera function of the electronic device and give consideration to the pursuit of a full screen is still an urgent problem to be solved. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a terminal device, and a display screen thereof and application thereof. A camera module of the terminal device can collect sufficient light and a screen-to-body ratio of the terminal device can be improved. 
     Another object of the present invention is to provide a terminal device, and a display screen thereof and application thereof. A camera module of the terminal device is configured as an under-screen camera module and can receive sufficient light via a light through hole of the display screen. 
     Another object of the present invention is to provide a terminal device, and a display screen thereof and application thereof. A camera module of the terminal device is configured as an under-screen camera module and can receive sufficient light via a light through hole at an edge of the display screen. 
     Another object of the present invention is to provide a terminal device, and a display screen thereof and application thereof. Light passing through a light through hole can be guided to a camera module along a preset path to be received by the camera module. 
     Another object of the present invention is to provide a terminal device, and a display screen thereof and application thereof. A camera module and the display screen can be assembled together to facilitate holding relative positions of the camera module and the display screen. 
     Another object of the present invention is to provide a terminal device, and a display screen thereof and application thereof. A camera module of the terminal device can be designed in a small size to facilitate reduction of an overall height of the display screen and the camera module located below the display screen. 
     According to an aspect of the present invention, the present invention provides an assembly system, which includes: a clamping apparatus for clamping at least one camera module, a test unit for testing an imaging effect of the camera module receiving light via a through hole of a display screen, and a support platform for supporting the display screen with the through hole. 
     According to an embodiment of the present invention, the clamping apparatus clamps the camera module and the camera module is held above the display screen. 
     According to an embodiment of the present invention, the test unit includes a light source, a target plate, and a sensing device, the light source and the target plate are located below the display screen, and the sensing device detects the imaging effect of the camera module. 
     According to an embodiment of the present invention, the support platform has a mounting space and a test hole, the test hole penetrates through the mounting space, the through hole of the display screen is aligned with the test hole when the display screen is accommodated in the mounting space, and light emitted from the light source sequentially passes through the test hole and the through hole and is then received by the camera module. 
     According to an embodiment of the present invention, the test hole is conical in shape and has a smaller aperture at a position closer to the camera module. 
     According to an embodiment of the present invention, the support platform includes a platform body, a fixing assembly, and a mounting space in which the display screen is accommodated, the mounting space is formed in the fixing assembly, and the fixing assembly is provided to the platform body. 
     According to an embodiment of the present invention, the fixing assembly is integrally formed on the platform body. 
     According to an embodiment of the present invention, the fixing assembly is detachably mounted to the platform body. 
     According to an embodiment of the present invention, the assembly system further includes a limiting mechanism provided to the display screen, wherein relative positions of the camera module and the display screen are limited by the limiting mechanism when the camera module is mounted to the display screen. 
     According to an embodiment of the present invention, the assembly system further includes a limiting mechanism provided to the camera module, wherein relative positions of the camera module and the display screen are limited by the limiting mechanism when the camera module is mounted to the display screen. 
     According to an embodiment of the present invention, the assembly system further includes a limiting mechanism provided to a base which is aligned with the display screen, and the camera module is aligned with the display screen by the limiting mechanism. 
     According to an embodiment of the present invention, the limiting mechanism is adhesively fixed to the display screen. 
     According to an embodiment of the present invention, the limiting mechanism includes a sleeve having a free end and a connecting end, and a connecting portion extending outward from the connecting end of the sleeve in a radial direction of the sleeve, and the connecting portion is attached to a back side of the display screen when the sleeve is mounted to the display screen. 
     According to an embodiment of the present invention, the limiting mechanism includes a sleeve having a free end and a connecting end, and at least one connecting pin extending outward from the connecting end of the sleeve in an axial direction of the sleeve, and the connecting pin extends into the display screen when the sleeve is mounted to the display screen. 
     According to an embodiment of the present invention, the display screen has at least one embedded channel, and the connecting pin of the limiting mechanism is embedded in the embedded channel, the display screen includes a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, a pixel layer, and a drive circuit layer, which are overlapped with each other in a height direction, the drive circuit layer is formed on a bottom side of the pixel layer and electrically connected to the pixel layer to drive the pixel layer to operate, the encapsulation layer is formed on a top side of the pixel layer and configured to encapsulate the pixel layer, wherein the through hole penetrates through the touch layer, the polarization layer, the encapsulation layer, the pixel layer, and the drive circuit layer in the height direction, the drive circuit layer includes a substrate base and a plurality of TFT structures provided to the substrate base, and the embedded channel is located between the adjacent TFT structures. 
     According to an embodiment of the present invention, the display screen has a mounting channel communicated with the through hole, and at least a part of the limiting mechanism is accommodated in the mounting channel. 
     According to an embodiment of the present invention, an inner diameter of the mounting channel is larger than the through hole. 
     According to another aspect of the present invention, the present application provides a terminal device, which includes: a terminal device body, a display screen, a camera module, and a limiting mechanism, wherein the display screen is mounted to the terminal device body and has a through hole penetrating from top to bottom, the camera module is held below the display screen and aligned with the through hole, the limiting mechanism is connected to the camera module and the display screen respectively, and the camera module is fixed to the display screen by the limiting mechanism. 
     According to an embodiment of the present invention, the limiting mechanism is adhesively fixed to the display screen. 
     According to an embodiment of the present invention, the limiting mechanism includes a sleeve having a free end and a connecting end, and a connecting portion extending outward from the connecting end of the sleeve in a radial direction of the sleeve, and the connecting portion is attached to a back side of the display screen when the sleeve is mounted to the display screen. 
     According to an embodiment of the present invention, the limiting mechanism includes a sleeve having a free end and a connecting end, and at least one connecting pin extending outward from the connecting end of the sleeve in an axial direction of the sleeve, and the connecting pin extends into the display screen when the sleeve is mounted to the display screen. 
     According to an embodiment of the present invention, the display screen has at least one embedded channel, the connecting pin of the limiting mechanism is embedded in the embedded channel, the display screen includes a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, a pixel layer, and a drive circuit layer, which are overlapped with each other in a height direction, the drive circuit layer is formed on a bottom side of the pixel layer and electrically connected to the pixel layer to drive the pixel layer to operate, the encapsulation layer is formed on a top side of the pixel layer and configured to encapsulate the pixel layer, wherein the through hole penetrates through the touch layer, the polarization layer, the encapsulation layer, the pixel layer, and the drive circuit layer in the height direction, the drive circuit layer includes a substrate base and a plurality of TFT structures provided to the substrate base, and the embedded channel is located between the adjacent TFT structures. 
     According to an embodiment of the present invention, the display screen has a mounting channel communicated with the through hole, and at least a part of the limiting mechanism is accommodated in the mounting channel. 
     According to another aspect of the present invention, the present invention provides an assembly method of a camera module, which includes the following steps: 
     mounting a camera module on a limiting mechanism, wherein the camera module and the limiting mechanism are located below a through hole of a display screen; 
     adjusting a position of the camera module to achieve a desired effect based on an imaging effect of the camera module; and 
     fixing the camera module and the display screen to the adjusted position. 
     According to an embodiment of the present invention, in the above method, the limiting mechanism is provided to the display screen. 
     According to an embodiment of the present invention, in the above method, the limiting mechanism is provided to a base, and the camera module is located between the base and the display screen. 
     According to an embodiment of the present invention, in the above method, relative positions of the camera module and the display screen are adjusted by adjusting relative positions of the camera module and the limiting mechanism. 
     According to an aspect of the present invention, the present invention provides a terminal device, which includes: a terminal device body, a display screen, a camera module, and at least one light through hole, wherein the display screen is mounted to the terminal device body, the camera module is held below the display screen and aligned with the through hole, the light through hole penetrates through at least a part of the display screen in a height direction, light outside the display screen is conducted to the camera module below the display screen via the light through hole, and the light through hole is designed as a virtual diaphragm of the camera module. 
     According to an embodiment of the present invention, the terminal device further includes a housing, wherein one of the light through holes penetrates from a side surface of the display screen to a bottom surface of the display screen in a gap between the housing and the display screen. 
     According to an embodiment of the present invention, the camera module includes a photosensitive unit, an optical mechanism held in a photosensitive path of the photosensitive unit and receiving light passing through the light through hole, and a diaphragm mounted to the optical mechanism. 
     According to an embodiment of the present invention, the camera module includes a photosensitive unit aligned with the light through hole, and an optical unit held in the light through hole. 
     According to an embodiment of the present invention, the optical unit includes an optical lens which includes a lens barrel and a plurality of lenses, the lens barrel includes a lens barrel wall and an extension wall, the lenses are mounted to the lens barrel wall, and the extension wall extends vertically upward for a preset distance from an end of the lens barrel wall close to the display screen. 
     According to an embodiment of the present invention, the extension wall is configured to extend vertically upward and then inward from the lens barrel wall. 
     According to an embodiment of the present invention, the extension wall is configured to extend upward from the lens barrel wall, and has a smaller inner diameter as being closer to the lens barrel wall. 
     According to an embodiment of the present invention, the extension wall has consistent inner diameters at each position. 
     According to an embodiment of the present invention, the extension wall has a smaller outer diameter as being closer to the lens barrel wall; or, the extension wall has a larger outer diameter as being closer to the lens barrel wall. 
     According to an embodiment of the present invention, the display screen includes a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, a pixel layer, and a drive circuit layer, which are overlapped with each other in a height direction, the drive circuit layer is formed on a bottom side of the pixel layer and electrically connected to the pixel layer to drive the pixel layer to operate, the encapsulation layer is formed on a top side of the pixel layer for encapsulating the pixel layer, the polarization layer is configured to polarize passing light, and wherein the light through hole penetrates through the touch layer, the polarization layer, the encapsulation layer, the pixel layer, and the drive circuit layer other than the cover plate layer of the display screen in the height direction. 
     According to an embodiment of the present invention, the drive circuit layer includes a substrate base and a plurality of TFT structures provided to the substrate base, and the light through hole is located between the adjacent TFT structures. 
     According to an embodiment of the present invention, the pixel layer includes a plurality of pixels, and the light through hole is located between the adjacent pixels. 
     According to an embodiment of the present invention, the drive circuit layer includes a substrate base and a plurality of TFT structures provided to the substrate base, and the light through hole is located between the adjacent TFT structures. 
     According to an embodiment of the present invention, the terminal device is provided with a protective material, which is located in the light through hole and coated on the pixel layer and/or the drive circuit layer. 
     According to an embodiment of the present invention, the pixel layer includes an anode layer, a light emitting layer, a cathode layer, and a protective layer, the anode layer is located above the drive circuit layer, the light emitting layer is located between the anode layer and the cathode layer, and the cathode layer is located above the light emitting layer and below the protective layer. 
     According to an embodiment of the present invention, the terminal device is provided with a protective material, which is located in the light through hole, and is extended downward from the protective layer to the cathode layer or extended downward from the protective layer to the light emitting layer or extended downward from the protective layer to the anode layer. 
     According to an embodiment of the present invention, the terminal device includes a back plate layer, which is located below the drive circuit layer and configured to emit light, wherein the pixel layer includes a filter layer and a liquid crystal located between the filter layer and the drive circuit layer, the pixel layer is provided with a sealing material located between the filter layer and the drive circuit layer, and the liquid crystal is blocked by the sealing material so as not to leak to the light through hole. 
     According to an embodiment of the present invention, the terminal device is provided with a protective material, which is located in the light through hole and coated on the pixel layer and/or the drive circuit layer. 
     According to an embodiment of the present invention, the terminal device further includes a light guide conduit, wherein the light guide conduit is accommodated in the light through hole. 
     According to an embodiment of the present invention, the light guide conduit is made of a transparent material. 
     According to an embodiment of the present invention, the light guide conduit is coated with an opaque material. 
     According to an embodiment of the present invention, the terminal device further includes a limiting mechanism, wherein one end of the limiting mechanism is connected to the camera module, the other end of the limiting mechanism is connected to the display screen, and the camera module is fixed to the display screen by the limiting mechanism. 
     According to an aspect of the present invention, the present invention provides a display unit for matching with a camera module. The display unit includes: a display screen, a light supplementing unit, and a light through hole, wherein the light through hole penetrates through at least a part of the display screen in a height direction, the light supplementing unit is capable of radiating light to the outside of the display screen and forms a light hole when the camera module is in a working state, and light from the outside of the display screen is received by the camera module after being constrained by the light through hole and the light hole. 
     According to an embodiment of the present invention, the light supplementing unit is provided to the display screen. 
     According to an embodiment of the present invention, the light supplementing unit is provided inside the display screen. 
     According to an embodiment of the present invention, the display screen includes a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, a pixel layer, and a drive circuit layer, the cover plate layer is located on a top side, the drive circuit layer is formed on a bottom side of the pixel layer and electrically connected to the pixel layer to drive the pixel layer to operate, the encapsulation layer is formed on a top side of the pixel layer, and the light supplementing unit is located at the drive circuit layer. 
     According to an embodiment of the present invention, the display screen includes a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, a pixel layer, a drive circuit layer, and a back plate layer, the cover plate layer is located on a top side, the back plate layer is located on a bottom side, the drive circuit layer is formed on a bottom side of the pixel layer and electrically connected to the pixel layer to drive the pixel layer to operate, the encapsulation layer is formed on a top side of the pixel layer, and the light supplementing unit is located at the back plate layer. 
     According to an embodiment of the present invention, the light supplementing unit is held between the display screen and the camera module. 
     According to an embodiment of the present invention, the light supplementing unit is detachably mounted to the display screen. 
     According to an embodiment of the present invention, the light supplementing unit includes a diaphragm structure and a light emitting structure, the diaphragm structure includes a diaphragm moving portion and a diaphragm driving portion, the diaphragm moving portion is drivingly connected to the diaphragm driving portion in a manner of forming a light hole of a variable size, and the light emitting structure is located at the diaphragm moving portion. 
     According to an embodiment of the present invention, the light emitting structure is located on an upper surface of the diaphragm moving portion. 
     According to an embodiment of the present invention, a lower surface of the diaphragm moving portion is configured to be light-shielding when the light emitting structure is located on the upper surface of the diaphragm moving portion. 
     According to an embodiment of the present invention, the light supplementing unit further includes a reflecting structure, which is located below the light emitting structure to reflect light of the light emitting structure toward the outside of the display screen. 
     According to an embodiment of the present invention, the reflecting structure is stretchable to be deformably provided to the diaphragm structure, and a reflectivity of the reflecting structure changes when the reflecting structure is deformed as the diaphragm moving portion moves. 
     According to an embodiment of the present invention, the light emitting structure includes a light emitting element, the diaphragm moving portion has a hole, a size of the hole changes to form the light hole of a variable size during the movement of the diaphragm moving portion driven by the diaphragm driving portion, and the light emitting element is provided to the diaphragm moving portion. 
     According to an embodiment of the present invention, the light emitting structure includes a plurality of pixels, the diaphragm moving portion includes a plurality of blades drivingly connected to the diaphragm driving portion, and at least one of the pixels is provided to the at least one blade. 
     According to an embodiment of the present invention, a plurality of pixels are provided to one of the blades. 
     According to an embodiment of the present invention, the light emitting structure is located inside the diaphragm moving portion. 
     According to an embodiment of the present invention, the light supplementing unit includes a diaphragm moving portion and a diaphragm driving portion, the diaphragm moving portion is drivingly connected to the diaphragm driving portion in a manner of forming a light hole of a variable size, and the diaphragm moving portion is configured to emit light. 
     According to another aspect of the present invention, the present invention provides a terminal device, which includes: 
     a terminal device body; 
     the above display unit; and 
     a camera module, located below the display unit and having a front end, wherein the front end of the camera module is mounted to the display screen of the display unit and the camera module is aligned with the light through hole of the display screen, so that light outside the display screen is received by the camera module via the light through hole. 
     According to another aspect of the present invention, the present invention provides an operating method of a display unit, which includes the following steps: 
     operating, when a display screen with a light through hole works, a light supplementing unit to emit light so as to supplement a light intensity of a position of the light through hole. 
     According to an embodiment of the present invention, the operating method further includes the following steps: 
     operating, when a camera module which is located below the display screen and aligned with the light through hole works, a diaphragm structure of a light supplementing unit above the camera module to form a light hole, light reaching the camera module after being constrained by means of the light through hole and the light supplementing unit. 
     According to an aspect of the present invention, the present invention provides a terminal device, which includes: a terminal device body, a display screen, a camera module, a housing, and a light guide channel, wherein at least a part of the light guide channel is located between the display screen and the housing, at least a part of the light guide channel penetrates through the display screen, the display screen is mounted to the terminal device body, the camera module is located below the display screen and mounted to the display screen, the light guide channel is aligned with the camera module, and light is capable of imaging after reaching the camera module via the light guide channel. 
     According to an embodiment of the present invention, the light guide channel extends from a side surface of the display screen to a bottom surface of the display screen, and the camera module is attached to the bottom surface of the display screen. 
     According to an embodiment of the present invention, the display screen includes, from top to bottom, a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, a pixel layer, a drive circuit layer, and a back plate layer, the drive circuit layer is formed on a bottom side of the pixel layer and electrically connected to the pixel layer to drive the pixel layer to operate, the encapsulation layer is formed on a top side of the pixel layer for encapsulating the pixel layer, the polarization layer is configured to polarize light, the drive circuit layer is supported on the back plate layer, and the light guide channel penetrates through one or more of the touch layer, the polarization layer, the encapsulation layer, the pixel layer, the drive circuit layer, and the back plate layer. 
     According to an embodiment of the present invention, the terminal device includes an optical unit, wherein the optical unit is held in the light guide channel and allows light to be transmitted therethrough. 
     According to an embodiment of the present invention, the display screen has a light through hole penetrating from top to bottom, and the light through hole is aligned with the camera module. 
     According to an embodiment of the present invention, the light guide channel and the light through hole at least partially coincide, and an image obtained by light reaching the camera module via the light guide channel and an image obtained by light reaching the same camera module via the light through hole are consistent. 
     According to an embodiment of the present invention, the terminal device further includes a light guide assembly, wherein the light guide assembly forms the light guide conduit and penetrates through the display screen. 
     According to an embodiment of the present invention, the light guide assembly is made of a light transmitting material. 
     According to an embodiment of the present invention, the light guide assembly is a light guide conduit coated with an opaque material. 
     According to an embodiment of the present invention, the terminal device includes an optical unit, wherein the optical unit is located at the light guide assembly and held in the light guide channel, and allows light to be transmitted therethrough. 
     According to an embodiment of the present invention, the display screen has a light through hole penetrating from top to bottom, and the light through hole is aligned with the camera module. 
     According to an embodiment of the present invention, the light guide channel and the light through hole at least partially coincide, and an image obtained by light reaching the camera module via the light guide channel and an image obtained by light reaching the same camera module via the light through hole are consistent. 
     According to an embodiment of the present invention, one of the light guide assemblies is accommodated in the light through hole. 
     According to another aspect of the present invention, the present invention provides a manufacturing method of a display screen, which includes the following steps: 
     forming a light guide channel extending from a side surface of a display screen to a bottom surface of the display screen. 
     According to an embodiment of the present invention, the above method further includes the following steps: 
     correspondingly forming holes at a preset position of each layer of the display screen; and 
     mounting the layers of the display screen so that the corresponding holes form the light guide channel. 
     According to an embodiment of the present invention, the above method further includes the following steps: 
     forming a hole penetrating through a drive circuit layer in the drive circuit layer; 
     providing a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, and a pixel layer above the drive circuit layer respectively to obtain the display screen; and 
     perforating the display screen in alignment with the hole of the drive circuit layer to obtain the light guide channel. 
     According to an embodiment of the present invention, the above method further includes the following steps: 
     forming the pixel layer on the drive circuit layer with a hole; 
     forming a hole penetrating through the pixel layer and the drive circuit layer in the pixel layer and the drive circuit layer; and 
     providing a cover plate layer, a touch layer, a polarization layer, and an encapsulation layer above the pixel layer respectively. 
     According to another aspect of the present invention, the present invention provides a manufacturing method of a display screen, which includes the following steps: 
     providing a cover plate layer, a touch layer, a polarization layer, an encapsulation layer, and a back plate layer on both sides of a liquid crystal layer respectively to obtain a display screen; and 
     perforating the display screen in alignment with a sealing region of the liquid crystal layer on a side surface or a bottom surface of the display screen to obtain a light guide channel penetrating through the side surface to the bottom surface of the display screen. 
     According to an embodiment of the present invention, in the above method, the method for manufacturing the liquid crystal layer further includes the following steps: 
     providing a sealing material between a filter layer and a drive circuit layer to form the sealing region; and 
     filling a liquid crystal outside the sealing region. 
     According to an embodiment of the present invention, a hole is pre-formed in the liquid crystal layer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of a terminal device according to the prior art. 
         FIG. 2  is a schematic diagram of a display screen and a camera module according to the prior art. 
         FIG. 3  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 4A  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 4B  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 5A  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 5B  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 6A  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 6B  is a schematic diagram of the above display screen according to the above preferred embodiment of the present invention. 
         FIG. 7  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 8  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 9  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 10  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 11  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 12  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 13  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 14A  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 14B  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 15  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 16  is a schematic diagram of manufacture of a display screen according to a preferred embodiment of the present invention. 
         FIG. 17  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 18A  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 18B  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 19  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 20  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 21  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 22  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 23  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 24  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 25  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 26  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 27  is a schematic diagram of application of a display screen according to a preferred embodiment of the present invention. 
         FIG. 28  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 29  is a schematic diagram of a display screen according to a preferred embodiment of the present invention. 
         FIG. 30  illustrates a specific example of a camera module according to an embodiment of the present application. 
         FIG. 31  illustrates another specific example of a camera module according to an embodiment of the present application. 
         FIG. 32  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 33  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 34  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 35  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 36  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 37  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 38  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 39  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 40  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 41  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 42  illustrates yet another specific example of a camera module according to an embodiment of the present application. 
         FIG. 43  is a schematic diagram of a conventional camera module based on a molding process. 
         FIG. 44  is a specific schematic diagram of a photosensitive chip of the camera module. 
         FIG. 45  is another specific schematic diagram of a photosensitive chip of the camera module. 
         FIG. 46  is a specific schematic diagram of a photosensitive layer of a photosensitive chip of the camera module. 
         FIG. 47  is another specific schematic diagram of a photosensitive layer of a photosensitive chip of the camera module. 
         FIG. 48A  is a schematic diagram of an assembly system according to a preferred embodiment of the present invention. 
         FIG. 48B  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 49  is a schematic diagram of a support platform of the assembly system according to a preferred embodiment of the present invention. 
         FIG. 50  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 51A  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 51B  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 51C  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 52  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 53  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 54  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 55  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 56  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 57  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 58  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 59  is a schematic diagram of an assembly process according to a preferred embodiment of the present invention. 
         FIG. 60A  is a schematic diagram of a lens barrel according to a preferred embodiment of the present invention. 
         FIG. 60B  is a schematic diagram of a lens barrel according to a preferred embodiment of the present invention. 
         FIG. 60C  is a schematic diagram of a lens barrel according to a preferred embodiment of the present invention. 
         FIG. 60D  is a schematic diagram of a lens barrel according to a preferred embodiment of the present invention. 
         FIG. 60E  is a schematic diagram of a lens barrel according to a preferred embodiment of the present invention. 
         FIG. 61A  is a schematic diagram of a terminal device according to a preferred embodiment of the present invention. 
         FIG. 61B  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 61C  is a partial schematic diagram of another operating state of the display unit according to the above preferred embodiment of the present invention. 
         FIG. 62A  is a partial schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 62B  is a partial schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 62C  is a partial schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 63  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 64  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 65  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 66  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 67  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 68  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 69  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 70  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
         FIG. 71  is a schematic diagram of a display unit according to a preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The following description is used to disclose the present invention to enable those skilled in the art to implement the present invention. The preferred embodiments in the following description are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention as defined in the following description may be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions without departing from the spirit and scope of the present invention. 
     It should be understood by those skilled in the art that in the disclosure of the present invention, the orientation or positional relationship indicated by terms “longitudinal”, “transverse”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc. is based on the orientation or positional relationship shown in the drawings, which is merely for the convenience of describing the present invention and for the simplification of the description, and not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms shall not be construed as a limitation of the present invention. 
     It will be understood that the term “a/an” is construed as “at least one” or “one or more”, that is, in one embodiment, the number of an element may be one, and in another embodiment, the number of elements may be plural, and the term “a/an” cannot be construed as limiting the quantity. 
     Although ordinals such as “first” and “second” will be used to describe various assemblies, those components are not limited herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component without departing from the teachings of the inventive concept. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     The term used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, singular forms are also intended to include plural forms as well, unless the context clearly dictates otherwise. It will be further understood that when used in this specification, the terms “including” and/or “having” specify the presence of the features, numbers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or combinations thereof. 
     The terms used herein, including technical and scientific terms, have the same meaning as commonly understood by those skilled in the art, so long as the terms are not defined differently. It will be understood that the terms defined in commonly used dictionaries have meanings consistent with the meanings of the terms in the prior art. 
     The present invention will now be described in further detail with reference to the accompanying drawings and detailed description. 
     SUMMARY OF THE APPLICATION 
     In recent years, a technical solution of an under-screen camera module is proposed. The camera module is held below a display screen, mounted to a motherboard of an electronic device such as a mobile phone. And, limited to a manufacturing process, a large light transmitting region is reserved on the display screen, so that the camera module can normally find a view through the light transmitting region. The size of the light transmitting region is much larger than that of a light receiving region of the camera module, and once a field angle θ of the camera module is set larger, the light transmitting region needs to be set larger so as to meet the view-finding requirements of the camera module in the process of moving back and forth. The light receiving region of the camera module refers to a region where a lens portion of the camera module is used for light entering. 
     Referring to  FIGS. 1A and 1B , schematic diagrams of a conventional under-screen camera module  30 P are shown. As shown in  FIG. 1 , a display screen  20 P has a light transmitting region S. The light transmitting region S is much larger than a light receiving region P of the camera module  30 P due to limitation to an early manufacturing process, and the light transmitting region S needs to be made larger when the camera module  30 P needs to move back and forth relative to the display screen  20 P. 
     Viewed from above the display screen  20 P, the light transmitting region S will occupy a larger region of the display screen  20 P. Further, since the light transmitting region S cannot be used for displaying in order to ensure light entering of the module in the prior art, it is not advantageous for improving a screen-to-body ratio of the entire display screen  20 P. 
     The present invention provides a display screen  20 P. The display screen  20 P can satisfy imaging light required by the camera module  30 P below the display screen  20 P and improve the screen-to-body ratio of the display screen  20 P as much as possible. 
     Referring to  FIGS. 2-5B , schematic diagrams of the display screen  20  and a manufacturing method thereof according to some embodiments of the present invention are shown. 
     The display screen  20  has a light through hole  200 . The light through hole  200  serves as the light transmitting region. The camera module  30  is located below the display screen  20 . The camera module  30  images by receiving light passing through the light through hole  200 . 
     It is worth mentioning that the camera module  30  can be fixed to the display screen  20 , so that no space needs to be reserved between the camera module  30  and the display screen  20 , an overall height can be reduced, and since the camera module  30  is closely attached to the display screen  20 , the requirement of the camera module  30  on the area of the light transmitting region S can also be reduced. The camera module  30  can also, certainly, be moved relative to the display screen  20 , but the light transmitting region of the display screen  20  can be made smaller. 
     The light transmitting region, i.e., the light transmitting hole  200 , can be designed smaller, and higher requirements are imposed on a manufacturing process of the display screen  20 . 
     In the present example, the display screen  20  is implemented as an organic light-emitting diode (OLED) display screen  20 . The display screen  20  includes a cover plate layer  21 , a touch layer  22 , a polarization layer  23 , an encapsulation layer  24 , a pixel layer  25 , a drive circuit layer  26 , and a back plate layer  27 , which are arranged from top to bottom. The cover plate layer  27  is located on a top side. The back plate layer is located on a bottom side. The drive circuit layer  26  is formed on a bottom side of the pixel layer  25  and electrically connected to the pixel layer  25  to drive the pixel layer  25  to operate. The encapsulation layer  24  is formed on a top side of the pixel layer  25  for encapsulating the pixel layer  25 . The pixel layer  25  includes pixels arranged in an array, and gaps are formed between the pixels, so that light sequentially transmitted through the cover plate layer  21 , the touch layer  22 , the polarization layer  23 , and the encapsulation layer  24  can pass through the pixel layer  25  via the gaps. 
     In particular, the display screen  20  also has the light through hole  200 . The light through hole  200  penetrates through the touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , and the drive circuit layer  26 . It is worth noting that the light through hole  200  may penetrate through the cover plate layer  21  or may not penetrate through the cover plate layer  21 . The cover plate layer  21  is generally made of a material having a good light transmittance, such as glass, so that the cover plate layer  21  can allow light to pass therethrough efficiently without perforating. 
     Further, the cover plate layer  21  is located above the display screen  20 . If the cover plate layer  21  is a complete structure, the cover plate layer  21  located above each layer of the display screen  20  may protect other layers from contaminants such as moisture or dust entering the other layers of the display screen  20 . In the present example, preferably, the light through hole  200  does not penetrate through the cover plate layer  21 . 
     The camera module  30  can be mounted below the display screen  20 , and receives sufficient amount of light above the display screen  20  via the light through hole  200 . 
     Further, the camera module  30  is fixedly mounted to the display screen  20 , and the size of the light through hole  200  of the display screen  20  can be designed to be small. 
     As shown in  FIGS. 3A and 3B , in the present embodiment, the display screen  20  is implemented as an OLED display screen  20 . Those skilled in the art would know that the OLED display screen  20  has the advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, high reaction speed, full coloring, etc. 
     The cover plate layer  21  is usually implemented as a glass layer, which is located on the topmost layer of the display screen  20  for protecting the layers below the cover plate layer  21 . It will be understood that the glass layer is made of a glass material, which is a material having a high light transmittance. 
     The touch layer  22  is located below the cover plate layer  21 , and the cover plate layer  21  and the touch layer  22  are usually connected by an adhesive. Those skilled in the art would know that the touch layer  22  is an indispensable configuration for realizing the display screen  20  having a touch function. 
     The polarization layer  23  is located below the touch layer  22 . The polarization layer  23  is usually implemented as circularly polarized light, etc. 
     The encapsulation layer  24  is located below the polarization layer  23 . The encapsulation layer  24  serves to encapsulate the pixel layer  25  located below the encapsulation layer  24  so that the pixel layer  25  is in a sealed environment to prevent organic material in the pixel layer  25  from being polluted by the outside or volatilized. Specifically, the encapsulation layer  24  has two types. When the display screen  20  is a rigid screen, the encapsulation layer  24  is made of a rigid light-transmittable material such as glass or plastic. When the display screen  20  is a flexible screen, the encapsulation layer  24  is made of a flexible light-transmittable material such as a polyimide (PI) film. 
     The pixel layer  25  is wrapped by the encapsulation layer  24  and located below the encapsulation layer  24 . For the OLED display screen  20 , a pixel unit in the pixel layer  25  is implemented as an OLED, i.e. organic light-emitting diode. 
     The drive circuit layer  26  is located below the pixel layer  25 . The drive circuit layer  26  can be electrically connected to the pixel layer  25  to drive the pixel layer  25  to operate. 
     The back plate layer  27  is located below the drive circuit layer  26 . The back plate layer  27  can enhance the structural strength of the entire display screen  20 . The back plate layer  27  is usually made of a plastic material. 
     For the OLED display screen  20 , it is necessary to avoid the pixel layer  25  and the drive circuit layer  26  in a perforating process. The drive circuit layer  26  is provided with a circuit structure, the pixel layer  25  includes a plurality of pixels, and once the light through hole  200  destroys the circuit structure of the drive circuit layer  26  or a pixel structure of the pixel layer  25 , it is likely to affect the working performance of the OLED display screen  20 . 
     There are mainly three ways to perforate the OLED display screen  20 . The first way is to uniformly perforate the layers of the OLED display screen  20  after the layers of the OLED display screen  20  are assembled. The second way is to perforate the layers of the OLED display screen  20  layer by layer. The third way is to perforate some layers of the OLED display screen  20  such as the pixel layer  25  and/or the drive circuit layer  26  in advance, and then perform uniformly perforating after the other layers are mounted to form the OLED display screen  20 . 
     It is worth noting that the perforating herein refers not only to forming actual small holes, but may also refer to the display screen  20  forming regions having a function similar to holes. For example, the display screen  20  may be first perforated and then filled with a transparent material at the perforated position so that the region can have a hole-like light through function. 
     It is worth mentioning that when the display screen  20  with the light through hole  200  is obtained in the first way, a perforated region may be reserved during the manufacturing of the drive circuit layer  26  and the pixel layer  25 , and the circuit structure of the drive circuit layer  26  and the pixels of the pixel layer  25  are not within the perforated region, thereby reducing the influence of the light through hole  200  on the working performance of the OLED display screen  20  after subsequent perforating. 
     The pixel layer  25  is formed on the drive circuit layer  26  by evaporation. The pixel layer  25  includes an anode layer  251 , a light emitting layer  252 , a cathode layer  253 , and a protective layer  254 . The anode layer  251  is located above the drive circuit layer  26 . The light emitting layer  252  is located between the anode layer  251  and the cathode layer  253 . The cathode layer  253  is located above the light emitting layer  252  and below the protective layer  254 . 
     The light through hole  200  penetrates through the pixel layer  25 . Specifically, the light through hole  200  penetrates through the layers of the pixel layer  25  and the display screen  20  in a direction perpendicular to each layer of the pixel layer  25 , other than the cover plate layer  21  of the display screen  20 . 
     The pixel layer  25  may also include other film layers, such as a planarization layer and a passivation layer, without limitation herein. While the light through hole  200  may be provided in a display region of the display screen  20  in the present example, since the diameter of the light through hole  200  involved in the present invention is less than or equal to 3.99 mm, preferably less than or equal to 2 mm, and the light through hole  200  does not affect the normal display of the display screen  20 , the camera module  30  is mounted at a preset position below the display screen  20  corresponding to the light through hole  200 . 
     It is worth mentioning that the preset position should be determined according to the diameter of the light through hole  200  and optical path parameters of the camera module  30 . That is, the camera module  30  is provided to the preset position to receive light via the light through hole  200  on the display screen  20  and perform normal imaging. Since the light through hole  200  is of a smaller size compared with a conventional light through hole, the display region is enlarged, thereby facilitating the manufacture of a full screen. 
     It is worth noting that the light through hole  200  may be triangular, rectangular, or circular. In the present example, the light through hole  200  is preferably circular. 
     Referring to  FIG. 4A , a specific implementation of a single perforating process for the OLED display screen  20  to perforate the entire OLED display screen  20  is illustrated. 
     After the pixel layer  25  is formed by the drive circuit layer  26 , at least a part of the protective layer  254  of the pixel layer  25  may be removed by etching, direct perforating, etc. to form a groove which may be filled with at least a part of a marker substance available for prompting the perforated region. The marker substance may be a transparent material, and the position of the marker substance may be determined based on the difference in light transmittance between the marker substance and a surrounding material. 
     Other layers of the OLED display screen  20  are mounted to the drive circuit layer  26  or the pixel layer  25  to obtain the complete OLED display screen  20 . The perforated region may be determined above the OLED display screen  20  based on the marker substance, and the OLED display screen  20  may be then perforated. In the perforating process, the light through hole  200  may have a larger range than the size of an area occupied by the marker substance, so that the marker substance may be completely removed after the perforating is completed. 
     It will be understood that the manner of positioning the perforated region by using the marker substance is by way of example only. It will be understood by those skilled in the art that the manner of perforating the OLED display screen  20  and bypassing the circuit structure of the drive circuit layer  26  and/or the pixel structure of the pixel layer  25  is not limited to the above example. 
     Referring to  FIG. 4B , a specific implementation mode of multiple single perforating processes for the OLED display screen  20  to perforate the entire OLED display screen  20  is illustrated. 
     In the present example, the drive circuit layer  26  and the pixel layer  25  are perforated, and other layers of the OLED display screen  20  are then perforated to obtain the display screen  20  with the light through hole  200 . 
     A region encircled by a dotted frame is the position of the light through hole  200 . The light through hole  200  penetrates through the display screen  20  in a direction perpendicular to the pixel layer  25  and the drive circuit layer  26 . Those skilled in the art would know that the structure of the pixel layer  25  in the figures is merely illustrative, that various functional layers may be provided as required, and that specific positions through which the light through hole  200  penetrate may be provided as required and are not limited to the positions shown in the figures. 
     Further, the drive circuit layer  26  includes a plurality of TFT structures  261  and a substrate base  262 . The TFT structures  261  are sequentially provided to the substrate base  262  to form a TFT array. The substrate base  262  is located below the TFT structures  261 . The TFT structures  261  are located below the pixel layer  25 . 
     The light through hole  200  penetrates from the pixel layer  25  to the substrate base  262  of the drive circuit layer  26 . 
     The pixel layer  25  further includes a planarization layer  255  and a pixel definition layer  256 . The planarization layer  255  is located between the TFT structure  261  and the anode layer  251 . The pixel definition layer  256  is located between the anode layer  251  and the light emitting layer  252 . The pixel definition layer  256  has at least one pixel trench  2560 . At least a part of the light emitting layer  252  and at least a part of the anode layer  251  are recessed formed in the pixel trench  2560  so that the pixel definition layer  256  can be used to define a pixel  257 . 
     In the present example, the light through hole  200  is formed between two of the TFT structures  261  so that circuit influence on the drive circuit layer  26  is reduced, and at least a part of the protective layer  254  covers around the light through hole  200  so that the anode layer  251 , the light emitting layer  252 , and the cathode layer  253  near the light through hole  200  are not exposed, thereby reducing external influence on the anode layer  251 , the light emitting layer  252 , and the cathode layer  253  such as air and moisture, or dust. 
     The light through hole  200  may be formed by first pre-designing a small hole in the process of manufacturing the drive circuit layer  26 . The small hole may be positioned as far away from the TFT structure  261  as possible to avoid damaging the structure of the drive circuit layer  26 . The small hole may be formed in the drive circuit layer  26  by direct laser drilling or etching, etc. 
     After the small hole is formed in the drive circuit layer  26 , the pixel layer  25  is formed on the drive circuit layer  26 . At this moment, the small hole in the drive circuit layer  26  is covered. Then, the drive circuit layer  26  and the pixel layer  25  may be perforated in alignment with the position of the small hole of the drive circuit layer  26  so that the drive circuit layer  26  and the pixel layer  25  are penetrated through. 
     The encapsulation layer  24  is mounted to the drive circuit layer  26  and the pixel layer  25 , and the encapsulation layer  24  may be perforated in alignment with the drive circuit layer  26  and the pixel layer  25 . The polarization layer  23 , the touch layer  22 , the cover plate layer  21 , and the back plate layer  27  are continuously mounted to the drive circuit layer  26  and the pixel layer  25 , and the polarization layer  23 , the touch layer  22 , and the back plate layer  27  are perforated layer by layer to obtain the display screen  20  with the light through hole  200 . 
     According to other embodiments of the present invention, the small hole in the drive circuit layer  26  is covered by the pixel layer  25  at this moment, the encapsulation layer  24 , the polarization layer  23 , the touch layer  22 , the cover plate layer  21 , and the back plate layer  27  are continuously mounted, and the display screen  20  is perforated in a thickness direction in alignment with the small hole after the complete display screen  20  is obtained, thereby obtaining the light through hole  200  penetrating through the display screen  20 . It will be understood that the layers of the display screen  20  may first be mounted to obtain a complete display screen  20 , and the layers other than the cover plate layer  21  may be then uniformly perforated. It is also possible to mount the layers of the display screen  20  other than the cover plate layer  21 , then perforate, and finally mount the cover plate layer  21  to obtain the complete display screen  20 . 
     According to other embodiments of the present invention, it will be certainly understood that the light through hole  200  may be formed by first pre-designing a small hole in the process of manufacturing the drive circuit layer  26 . The small hole may be positioned as far away from the TFT structure  261  as possible to avoid damaging the structure of the drive circuit layer  26 . Then the pixel layer  25  is formed on the basis of the drive circuit layer  26 . The pixel layer  25  may be perforated in alignment with the drive circuit layer  26 , and the encapsulation layer  24 , the polarization layer  23 , the touch layer  22 , the cover plate layer  21 , and the back plate layer  27  are then mounted, and the display screen  20  is perforated in a thickness direction in alignment with the small hole after the complete display screen  20  is obtained, thereby obtaining the light through hole  200  penetrating through the layers of the display screen  20  other than the cover plate layer  21 . It will be understood that the layers of the display screen  20  may first be mounted to obtain a complete display screen  20 , and the layers other than the cover plate layer  21  may be then uniformly perforated. It is also possible to mount the layers of the display screen  20  other than the cover plate layer  21 , then perforate, and finally mount the cover plate layer  21  to obtain the complete display screen  20 . 
     Referring to  FIGS. 5A and 5B , a specific implementation mode of multiple single perforating processes for the OLED display screen  20  to perforate the entire OLED display screen  20  is illustrated. 
     In the present example, the drive circuit layer  26  and the pixel layer  25  are obtained first, and the drive circuit layer  26  and the pixel layer  25  are then simultaneously perforated. 
     Specifically, the anode layer  251 , the light emitting layer  252 , and the cathode layer  253  of the pixel layer  25  are formed on the drive circuit layer  26 , and at least a part of the cathode layer  253  is then removed by means of etching to form a perforated region on the cathode layer  253 . 
     At least a part of the pixel layer  25  is exposed from the perforated region. Specifically, at least a part of the pixel definition layer  256  of the pixel layer  25  is exposed from the perforated region. Preferably, a projection of the perforated region in a vertical direction of the pixel layer  25  and the drive circuit layer  26  is located between the adjacent TFT structures  261  to minimize the circuit influence on the display screen  20 . 
     After forming the perforated region, the protective layer  254  is continuously formed over the cathode layer  253  and at least a part of the pixel definition layer  256 . A protective material of the protective layer  254  fills the perforated region, and a region around the perforated region is also filled with the protective material of the protective layer  254 . 
     At least a part of the light through hole  200  is then formed in the perforated region by means of drilling or cutting. At least a part of the pixel layer  25  and the drive circuit layer  26  are cut away in a height direction of the drive circuit layer  26  in the perforated region, for example, by using a laser cutting process, so that light above the pixel layer  25  passes through the pixel layer  25  and the drive circuit layer  26  to reach below the drive circuit layer  26 . A specific perforating method may include: etching the layers corresponding to the perforated region by means of a centrally-opened mask, and covering the other parts. 
     In the present example, at least a part of the cathode layer  253  needs to be removed before forming the protective layer  254 . In other embodiments of the present invention, at least a part of the cathode layer  253  and at least a part of the light emitting layer  252  need to be removed before forming the protective layer  254 . Specifically, it may be removed by means of dry etching. For example, a dry etching process may be completed by a plasma enhanced chemical vapor deposition etching device or by an inductively coupled plasma etching device. Etching gases may be oxygen-containing gases which can react with organic matters in the light emitting layer  252  or the cathode layer  253 , such as oxygen, nitrous oxide, or carbon dioxide. Or, etching gases are an oxygen-containing gas and an inert gas nitrogen, which are used simultaneously. 
     It is worth noting that the sizes of the perforated region and the light through hole  200  may be different. When the perforated region is larger than the light through hole  200  and the light through hole  200  is located within the perforated region, the cathode layer  253  located around the light through hole  200  can be protected from being exposed by the protective layer  254 . When the sizes of the perforated region and the light through hole  200  are consistent or the light through hole  200  is larger than the perforated region, the cathode layer  253  around the light through hole  200  may exposed. 
     After the pixel layer  25  is formed on the drive circuit layer  26 , the light through hole  200  can penetrate through the drive circuit layer  26  and the pixel layer  25 . 
     Further, the encapsulation layer  24 , the polarization layer  23 , the touch layer  22 , and the cover plate layer  21  can be mounted to the pixel layer  25  and the drive circuit layer  26  in a certain order. After the encapsulation layer  24 , the polarization layer  23 , the touch layer  22 , and the cover plate layer  21  are fixedly mounted to the pixel layer  25  and the drive circuit layer  26  respectively, the light through hole  200  penetrates through the layers of the entire display screen  20  other than the cover plate layer  21  by drilling or cutting. 
     When the display screen  20  includes the back plate layer  27 , the back plate layer  27  is mounted to the drive circuit layer  26 , and the light through hole  200  penetrates through the back plate layer  27  in the height direction of the display screen  20 . 
     It will be, certainly, understood that the encapsulation layer  24 , the polarization layer  23 , the touch layer  22 , and the back plate layer  27  may be perforated after being fixedly mounted to the drive circuit layer  26  and the pixel layer  25 , respectively. In other words, when the encapsulation layer  24  is mounted to the pixel layer  25 , the encapsulation layer  24  may be perforated in alignment with the pixel layer  25 . After the polarization layer  23  is mounted to the encapsulation layer  24 , the polarization layer  23  may be perforated. After the touch layer  22  is mounted to the polarization layer  23 , the touch layer  22  may be perforated. After the back plate layer  27  is mounted to the drive circuit layer  26 , the back plate layer  27  may be perforated. 
     The perforating timing of the display screen  20  other than the drive circuit layer  26  and the pixel layer  25  is not limited to the above illustration. For example, the encapsulation layer  24 , the polarization layer  23 , and the touch layer  22  are located on the same side of the pixel layer  25  and may be simultaneously perforated. The back plate layer  27  is located on the other side of the pixel layer  25  and may be perforated separately or together with the encapsulation layer  24 , the polarization layer  23 , and the touch layer  22 . 
     It is worth mentioning that other layers of the display screen  20  may be drilled or cut layer by layer before or after the drive circuit layer  26  forms the pixel layer  25 , and the small holes in the layers are then aligned by adjusting relative positions of the layers and can thus penetrate through each other. 
     Further, the inner diameters of the portions of the light through hole  200  corresponding to the layers of the display screen  20  may be different. For example, the inner diameter of the portion of the light through hole  200  corresponding to the touch layer  22  located above may be larger than the inner diameter of the portion of the light through hole  200  corresponding to the back plate layer  27  located below. Each of the small holes corresponding to the layers of the display screen  20  may be made independently, so that the inner diameters of the finally-formed light through holes  200  corresponding to the layers may be different. 
     Further, for each layer of the display screen  20 , taking the drive circuit layer  26  as an example, the small holes of the drive circuit layer  26  may be cylindrical. That is, the small holes have the same inner diameter at different height positions of the drive circuit layer  26 . The small holes of the drive circuit layer  26  may also be conical. That is, the small holes have different inner diameters at different height positions of the drive circuit layer  26 . For example, the inner diameters of the small holes are gradually reduced from top to bottom. 
     It will be understood by those skilled in the art that the shape of the small holes is not limited to the above example. 
     Referring to  FIGS. 6A, 6B, 5A, and 5B , another specific implementation of the display screen  20  according to the present invention is illustrated. In the present example, a protective material  2812  is provided near the position of the light through hole  200  of the display screen  20 . In particular, the protective material is provided near the position of the light through hole  200  corresponding to the pixel layer  25  and the drive circuit layer  26 . The protective material  2812  may be of the same material as the protective layer  254  of the pixel layer  25  or of a different material than the protective layer  254  of the pixel layer  25 . 
     The protective material  2812  is located near the position of the light through hole  200  to protect an internal structure of the exposed layers of the display screen  20 , in particular for the pixel layer  25  and the drive circuit layer  26 . The internal structures of the pixel layer  25  and the drive circuit layer  26  are exposed in the light through hole  200 . The pixel layer  25  and the drive circuit layer  26  may be damaged when dust, moisture, or air enters into the light through hole  200 . The protective material  2812  can cover the exposed portions of the pixel layer  25  and the drive circuit layer  26  at the positions of the light through hole  200 , thereby protecting the pixel layer  25  and the drive circuit layer  26  so that the pixel layer  25  and the drive circuit layer  26  can be in a relatively stable working environment. 
     After obtaining the display screen  20  with the light through hole  200 , the protective material  2812  may be poured into the light through hole  200  of the display screen  20 , and the protective material  2812  may be then perforated to form a new light through hole  200 . The protective material  2812  can cover each layer of the display screen  20 . A filling height of the protective material  2812  in the light through hole  200  may be, certainly, controlled according to the requirements of users, thereby selecting a covering position of the protective material  2812 . The protective material  2812  may not completely fill the light through hole  200 . For example, the position of the back plate layer  27  corresponding to the light through hole  200  may not be protected by the protective material. 
     It is worth noting that the cover plate layer  21  is not perforated in the present example. The cover plate layer  21  is generally made of glass and has a good light transmitting property per se, so that the cover plate layer  21  may not be perforated, and the cover plate layer  21  may be located above to protect other layers of the display screen  20 . 
     In this way, the original light through hole  200  may be made larger in advance, and the light through hole  200  is then controlled by cutting or drilling the protective material  2812  at a later stage so that the light through hole  200  is of a desired size. It is worth noting that the protective material  2812  around the light through hole  200  may be of the same material as the protective layer  254  or may be of different materials from the protective layer. 
     Referring to  FIG. 6B , a specific manufacturing method of the display screen  20  is illustrated. 
     In the present example, the layers constituting the display screen  20  are first perforated and then filled with the protective material  2812 . The protective material  2812  is a transparent material. That is, the original position of the light through hole  200  corresponding to the display screen  20  is filled with the transparent material. 
     Specifically, the touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27  may be perforated respectively, and the protective material  2812  may be then filled at the perforating position. 
     The touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27  are then mounted together in alignment to form the display screen  20 . At this moment, the display screen  20  may be used as a display screen with a “hole”. Transparent materials corresponding to the touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27  may function as holes. 
     Further, the touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27  are perforated simultaneously, and a portion of the protective material  2812  may be left around the light through hole  200 . The cover plate layer  21  is then mounted to obtain the display screen  20  shown in  FIG. 6A . 
     Referring to  FIG. 7 , another specific implementation mode of the display screen  20  according to the present invention is illustrated. 
     In the present example, at least a part of the protective material  2812  is formed around the light through hole  200  of the display screen  20 . The protective material  2812  can protect critical layers around the light through hole  200 , such as the cathode layer  253 , the pixel definition layer  256 , or the TFT structure  261 . 
     The protective material  2812  around the light through hole  200  may be positioned as required. For example, after obtaining the display screen  20  with the light through hole  200 , the diameter of the light through hole  200  may be slightly larger than a desired design value, the light through hole  200  is filled with the protective material  2812  until the entire light through hole  200  is filled, and the position of the light through hole  200  is cut to obtain the light through hole  200  of a desired size as required. 
     In the present example, the drive circuit layer  26  and the pixel layer  25  in the display screen  20  may selectively be protected separately. 
     Specifically, the drive circuit layer  26  is obtained first. The drive circuit layer  26  may be obtained by the steps of film forming on a base, photoresist coating, exposing, developing, etching, peeling, etc. After the drive circuit layer  26  is prepared, a small hole penetrating in the height direction may be prepared in the drive circuit layer  26  by means of etching or drilling. Preferably, the small hole is formed between the adjacent TFT structures  261  of the drive circuit layer  26 . 
     The pixel layer  25  is then formed on the drive circuit layer  26 , during which the small hole is filled. A material corresponding to the position of the small hole in the pixel layer  25  and the drive circuit layer  26  may be removed to obtain the light through hole  200 . 
     The protective material  2812  is then filled in the light through hole  200  corresponding to the pixel layer  25  and the drive circuit layer  26 , and the protective material  2812  in the light through hole  200  is then perforated to regain a hole slightly smaller than the original light through hole  200 . 
     At this moment, portions of the pixel layer  25  and the drive circuit layer  26  exposed in the light through hole  200  may be coated with the protective material  2812  so as to be protected by the protective material  2812 . 
     The other layers of the display screen  20  are then mounted to the drive circuit layer  26  and the pixel layer  25 . Each layer may selectively be drilled or cut after mounting so that the light through hole  200  penetrates through the display screen  20 , or drilled or cut in alignment with the small hole after each layer is mounted so that the light through hole  200  penetrates through each layer of the display screen  20 . 
     Referring to  FIGS. 8 and 2-5B , another specific implementation mode of the display screen  20  according to the present invention is illustrated. 
     In the present example, at least a part of the protective material  2812  is filled around the light through hole  200  of the display screen  20  corresponding to the pixel layer  25 . 
     A manufacturing method of the display screen  20  may include the following steps. The TFT structure  261 , the anode layer  251 , the light emitting layer  252 , and the cathode layer  253  are sequentially formed on the substrate base  262 . Further, the planarization layer  255  is formed after the TFT structure  261  is formed on the substrate base  262  and before the anode layer  251 . At least a part of the planarization layer  255  in a thickness direction is removed by using one patterning process, and one of the light through holes  200  is formed. The light through hole  200  is formed through the drive circuit layer  26  and the planarization layer  255 , and the anode layer  251 , the pixel definition layer  256 , and the cathode layer  253  are then formed on the planarization layer  255 . 
     At least parts of the light emitting layer  252  and the cathode layer  253  corresponding to the perforated region in the thickness direction are removed by using an etching process. Specifically, at least parts of the pixel definition layer  256 , the light emitting layer  252 , and the cathode layer  253  corresponding to the perforated region may be removed by using an etching process so that at least a part of the planarization layer  255  is exposed. 
     The pixel layer  25  is then encapsulated with the protective material  2812 , at least a part of the planarization layer  255  is covered with the protective material  2812 , and the light through hole  200  is formed in the perforated region by means of cutting or drilling, so that the planarization layer  255  and the pixel definition layer  256  at an edge of the light through hole  200  may be covered with the protective material  2812 . 
     In this way, the pixel layer  25  and the drive circuit layer  26  corresponding to the edge of the light through hole  200  may be selectively covered with the protective material  2812  as required. The protective material  2812  not only serves to protect the pixel layer  25 , but also controls the size of the light through hole  200  by controlling a radial thickness of the protective material  2812 . 
     In the present example, the light through hole  200  may be positioned in advance, and are preferably provided between the adjacent TFT structures  261  or between adjacent pixels to avoid influence on the performance of the entire display screen  20  while the light through hole  200  is provided. 
     Further, after the pixel layer  25  and the drive circuit layer  26  with the light through hole  200  are manufactured, the encapsulation layer  24 , the polarization layer  23 , the touch layer  22 , and the cover plate layer  21  or the back plate layer  27  may be continuously mounted to the pixel layer  25  and the drive circuit layer  26  as required. The encapsulation layer  24 , the polarization layer  23 , the touch layer  22 , and the cover plate layer  27  may be perforated in advance, may be perforated after being mounted to the pixel layer  25  and the drive circuit layer  26 , or may be perforated uniformly after the entire display screen  20  is mounted. 
     It is worth noting that the cover plate layer  21  is not perforated, and the layers of the display screen  20  other than the cover plate layer  21  may be uniformly perforated from one side of the back plate layer  27  of the display screen  20  after the layers of the display screen  20  are mounted together. 
     Further, the cover plate layer  21  may be partially perforated. Specifically, at least a part of the cover plate layer  21  in the thickness direction may be perforated. For example, at least a part of the cover plate layer  21  in the thickness direction may be removed when the display screen  20  is perforated from the back plate layer  27  to the cover plate layer  21  on one side of the back plate layer  27  of the display screen  20 . However, when viewed inward from one side of the cover plate layer  21  of the display screen  20 , the cover plate layer  21  still completely covers the touch layer  22 . The cover plate layer  21  may still protect the other layers of the display screen  20 . 
     Referring to  FIG. 9 , a specific implementation mode of the display screen  20  with the camera module  30  according to the present invention is illustrated. 
     The camera module  30  is fixedly mounted to the display screen  20 , and the camera module  30  is aligned with the light through hole  200 . 
     Specifically, the display screen  20  has a mounting channel  201 , and at least a part of the camera module  30  can be accommodated in the mounting channel  201 . The display screen  20  with the back plate layer  27  is described as an example. The mounting channel  201  is formed in the back plate layer  27 . 
     The mounting channel  201  is located at a position corresponding to the light through hole  200 , the mounting channel  201  is communicated with the light through hole  200 , and the mounting channel  201  and the light through hole  200  are located in the height direction of the display screen  20 . Preferably, an inner diameter of the mounting channel  201  is larger than that of other positions of the light through hole  200 . At this moment, a cross-sectional size of the light through hole  200  of the display screen  20  is non-constant. 
     When the camera module  30  is mounted to the display screen  20  and partially accommodated in the mounting channel  201 , the overall height of the camera module  30  and the display screen  20  can be reduced, thereby facilitating reduction of a height size of a mobile terminal. 
     The mounting channel  201  is slightly larger than the camera module  30 , and a part of the mounting channel  201  not filled by the camera module  30  may be filled with a colloid so that the camera module  30  can be more firmly fixed to the display screen  20 . 
     For example, a side surface of the camera module  30  may be adhered to the back plate layer  27  by a glue so that the camera module  30  is fixedly held in the mounting channel  201 . A top surface of the camera module  30  may also be fixed to a back surface of the drive circuit layer  26  by means of an adhesive substance such as a glue, so as to facilitate the camera module  30  to be stably held in the mounting channel  201 . 
     At least a part of the camera module  30  extends into the light through hole  200  of the display screen  20 . When the camera module  30  extends into the light through hole  200 , the size of the light through hole  200  corresponding to each layer of the display screen  20  may control the depth of the camera module  30  entering the light through hole  200 . 
     In the present example, at least a part of the camera module  30  is accommodated in a part of the light through hole  200  corresponding to the back plate layer  27 . A part of the light through hole  200  corresponding to each layer above the back plate layer  27  such as the drive circuit layer  26  and the pixel layer  25  may be smaller than the part of the light through hole  200  corresponding to the back plate layer  27 , so that when viewed from a front side of the display screen  20 , the light through hole  200  occupies a small area of the display screen  20 . The front side of the display screen  20  is referred to herein as a side facing a user during normal use. 
     In other embodiments of the present invention, a front end portion of the camera module  30  may extend to the drive circuit layer  26 , or even a part of the light through hole  200  corresponding to a part of the pixel layer  25 . By controlling the size of the light through hole  200  corresponding to each layer, the depth of the camera module  30  extending into the display screen  20  may be controlled, so that an overall size of the camera module  30  and the display screen  20 , in particular height sizes of the camera module  30  and the display screen  20 , is controlled by designing the size of the light through hole  200  corresponding to each layer of the display screen  20 . 
     Referring to  FIG. 10 , a display screen  20 A with a light through hole  200 A according to a preferred embodiment of the present invention is illustrated. 
     In the present example, the display screen  20 A is implemented as a liquid crystal display (LCD) screen  20 A. The display screen  20  includes a cover plate layer  21 A, a touch layer  22 A, a polarization layer  23 A, an encapsulation layer  24 A, a pixel layer  25 A, a drive circuit layer  26 A, and a back plate layer  27 A. The drive circuit layer  26 A is formed on a bottom side of the pixel layer  25 A and electrically connected to the pixel layer  25 A to drive the pixel layer  25 A to operate. The encapsulation layer  24 A is formed on a top side of the pixel layer  25 A for encapsulating the pixel layer  25 A. The pixel layer  25 A includes pixels arranged in an array, and gaps are formed between the pixels, so that light sequentially transmitted through the cover plate layer  21 A, the touch layer  22 A, the polarization layer  23 A, and the encapsulation layer  24 A can pass through the pixel layer  25 A via the gaps. 
     For the LCD screen  20 A, liquid crystals of the pixel layer  25 A are arranged orderly when energized. 
     In particular, the display screen  20 A also has the light through hole  200 A. The light through hole  200 A penetrates through the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, and the drive circuit layer  26 A. 
     The polarization layer  23 A may be respectively located on both sides of the pixel layer  25 A and implemented as a first polarizer and a second polarizer. 
     The pixel layer  25 A includes a filter layer  251 A (CF) and a liquid crystal  252 A. The liquid crystal  252 A is between the filter layer  251 A and the drive circuit layer  26 A. Taking a TFT-LCD as an example, the drive circuit layer  26 A may include a plurality of TFT structures and a substrate base. The TFT structures are formed on the substrate base by the steps of thin film forming, yellow lighting, etching, stripping, etc. 
     The light through holes  200 A are formed in the layers of the display screen  20 A other than the cover plate layer  21 A, and penetrate through the layers of the display screen  20 A other than the cover plate layer  21 A in a height direction of the display screen  20 A. 
     Light above the display screen  20 A or outside the display screen  20 A may pass through the light through hole  200 A to be received by the camera module  30  located below the display screen  20 A or inside the display screen  20 A. 
     A sealing material is provided around the light through hole  200 A, so that the liquid crystal  252 A cannot flow into the light through hole  200 A, so as to avoid influence on the working performance of the camera module  30  or the display performance of the display screen  20 A. 
     Further, the LCD screen  20 A includes a liquid crystal layer  28 A. The liquid crystal layer  28 A includes the liquid crystal  252 A, the filter layer  251 A, and the drive circuit layer  26 A. 
     There are mainly three manufacturing methods of the LCD screen  20 A with the light through hole  200 A. The first method is to uniformly perforate the layers of the LCD screen  20 A after the layers of the LCD screen  20 A are assembled together. The second method is to separately perforate the liquid crystal layer  28 A of the LCD screen  20 A, mount other layers of the LCD screen  20 A on the liquid crystal layer  28 A, and then uniformly perforate other layers of the LCD screen  20 A. The third method is to separately perforate the liquid crystal layer  28 A of the LCD screen  20 A, mount other layers of the LCD screen  20 A on the liquid crystal layer  28 A layer by layer, and then perforate the layers of the LCD screen  20 A layer by layer. 
     Those skilled in the art would know that the above is by way of example only and that the manufacturing methods of the LCD screen  20 A with the light through hole  200 A are not limited to the above examples. 
     Referring to  FIG. 11 , a specific manufacturing method of the LCD screen  20 A with the light through hole  200 A according to the present invention is illustrated. 
     In the present example, the LCD screen  20 A with the light through hole  200 A may be obtained by single perforating. 
     Specifically, in the process of manufacturing the liquid crystal layer  28 A, a sealing region  281 A is formed between the drive circuit layer  26 A and the filter layer  251 A of the liquid crystal layer  28 A. The sealing region  281 A may be surrounded by a sealing material  2811 A. The liquid crystal  252 A of the liquid crystal layer  28 A is mainly provided outside the sealing region  281 A. 
     The layers of the LCD screen  20 A are then assembled into a complete LCD screen  20 A. The LCD screen  20 A is perforated based on the sealing region  281 A. 
     The LCD screen  20 A has a perforated region  282 A. The perforated region  282 A overlaps the sealing region  281 A and is not larger than the sealing region  281 A. After the LCD screen  20 A is perforated, at least a part of the sealing region  281 A is removed, and the liquid crystal  252 A located between the sealing regions  281 A is blocked by the sealing material  2811 A and thus cannot pass over the sealing material  2811 A, so that the liquid crystal  252 A cannot overflow to the position of the light through hole  200 A. 
     In this way, the LCD screen  20 A may obtain the light through hole  200 A by a single perforating operation. 
     More specifically, the sealing material  2811 A may be provided to a preset position of the drive circuit layer  26 A of the liquid crystal layer  28 A to form the sealing region  281 A, and the sealing region  281 A may be circular, triangular, or rectangular. The liquid crystal  252 A is then filled at a position outside the sealing region  281 A of the drive circuit layer  26 A. 
     After the liquid crystal  252 A is filled, the filter layer  251 A may be mounted to the drive circuit layer  26 A. The liquid crystal  252 A is located between the drive circuit layer  26 A and the filter layer  251 A and is limited to a fixed region. 
     After the liquid crystal layer  28 A is perforated, the perforated region  282 A is smaller than the sealing region  281 A, and at least a part of the sealing material  2811 A can be held between the drive circuit layer  26 A and the filter layer  251 A, so that the liquid crystal  252 A does not overflow at the position of the sealing material  2811 A. The liquid crystal  252 A can still be limited within the original fixed region. 
     In this way, the liquid crystal layer  28 A can be perforated while keeping the liquid crystal  252 A of the liquid crystal layer  28 A from overflowing. 
     It is worth noting that after the display screen  20 A is mounted, if the perforating can be performed outside the display screen  20 A in alignment with the sealing region  281 A, the perforating may be performed directly. For example, the sealing region  281 A may be observed outside the display screen  20 A. 
     If the sealing material  2811 A is an opaque material and the position of the sealing region  281 A cannot be determined outside the display screen  20 A, a mark may be provided in the sealing region  281 A so that the position of the sealing region  281 A may be determined outside the display screen  20 A. 
     It is worth noting that the sealing material  2811 A may be positioned so as to avoid a corresponding circuit portion of the drive circuit layer  26 A in the height direction to reduce the circuit influence on the drive circuit layer  26 A. 
     Referring to  FIG. 12 , a specific manufacturing method of the LCD screen  20 A with the light through hole  200 A according to the present invention is illustrated. 
     In the present example, the liquid crystal layer  28 A is first perforated, and the other layers of the display screen  20 A are then perforated. 
     Specifically, the sealing region  281 A is provided to a preset region of the drive circuit layer  26 A to prevent the liquid crystal  252 A outside the sealing region  281 A from flowing into the sealing region  281 A during subsequent filling of the liquid crystal  252 A. The drive circuit layer  26 A may be perforated along a perforated region  282 A after the sealing region  281 A is provided. The perforated region  282 A is located within the sealing region  281 A. The drive circuit layer  26 A and the filter layer  251 A may be simultaneously perforated along the perforated region  282 A after the filter layer  251 A is mounted to the drive circuit layer  26 A. 
     According to some embodiments of the present invention, the order of perforating the liquid crystal layer  28 A may be: perforating the drive circuit layer  26 A and then perforating the filter layer  251 A. 
     For example, the drive circuit layer  26 A within the sealing region  281 A is first perforated based on the sealing region  281 A, a preset region of the drive circuit layer  26 A is filled with the liquid crystal  252 A, the filter layer  251 A is mounted to the drive circuit layer  26 A, and the filter layer  251 A is then perforated. 
     Further, after perforating the drive circuit layer  26 A within the sealing region  281 A, a region outside the sealing region  281 A of the drive circuit layer  26 A needs to be filled with the liquid crystal  252 A so that the display screen  20 A can operate normally in a subsequent step. 
     Further, according to other embodiments of the present invention, a perforated region  282 A of the drive circuit layer  26 A may be perforated, and a sealing material  2811 A may be provided around the perforated region  282 A to form the sealing region  281 A. The liquid crystal  252 A is filled outside the sealing region  281 A and cannot flow into the sealing region  281 A through the sealing material  2811 A under the obstruction of the sealing material  2811 A. That is, the liquid crystal  252 A cannot flow to the position of the light through hole  200 A after the perforating so as to help ensure a lighting effect of the light through hole  200 A in a subsequent step. 
     The filter layer  251 A is then mounted to the drive circuit layer  26 A and perforated in alignment with the perforated region  282 A of the drive circuit layer  26 A. At this moment, the liquid crystal  252 A between the filter layer  251 A and the drive circuit layer  26 A is still held outside the sealing region  281 A and does not flow to the position of the light through hole  200 A. 
     The other layers of the display screen  20 A, such as the encapsulation layer  24 A, the polarization layer  23 A, the touch layer  22 A, and the cover plate layer  21 A, may be then mounted to the liquid crystal layer  28 A in a certain order, respectively. The functional layers may be perforated layer by layer at the time of being mounted, or the layers may be simultaneously perforated after the other layers are mounted. 
     Preferably, in the present example, the cover plate layer  21 A of the display screen  20 A is not perforated. The manner of obtaining the display screen  20 A with the light through hole  200 A may be: first mounting each layer of the display screen  20 A to obtain a complete display screen  20 A, and then uniformly perforating the layers other than the cover plate layer  21 A. Alternatively, the layers of the display screen  20 A other than the cover plate layer  21 A may be mounted and then perforated, and finally the cover plate layer  21 A may be mounted to obtain the complete display screen  20 A. 
     It is worth noting that it is also possible to perforate the cover plate layer  21 A of the display screen  20 A and then fill the cover plate layer  21 A with a transparent material to prevent contaminants such as dust or moisture from entering the other layers of the display screen  20 A through a part of the light through hole  200 A corresponding to the cover plate layer  21 A located at the outermost side. 
     It is worth noting that the perforated region  282 A may be positioned in a variety of ways to facilitate subsequent accurate perforating before the layers are mounted to be uniformly perforated or before the layers are perforated layer by layer. The perforated region  282 A may be positioned, for example, by mechanical identification, and the other layers are perforated at the same position based on the data. 
     It is worth noting that the sealing material  2811 A for separating the light through hole  200 A and the liquid crystal  252 A may be provided to the drive circuit layer  26 A, or the filter layer  251 A, or both of the drive circuit layer  26 A and the filter layer  251 A. 
     According to other embodiments of the present invention, for example, the sealing material  2811 A is provided to the filter layer  251 A. After the drive circuit layer  26 A is filled with the liquid crystal  252 A, the filter layer  251 A provided with the sealing material  2811 A covers the drive circuit layer  26 A. The liquid crystal  252 A is separated within the sealing region  281 A and outside the sealing region  281 A by the sealing material  2811 A. The sealing material  2811 A provided to the filter layer  251 A is closely attached to the drive circuit layer  26 A, and the liquid crystal  252 A located outside the sealing region  281 A cannot pass into the sealing region  281 A through the sealing material  2811 A. The drive circuit layer  26 A and the filter layer  251 A are then perforated within the sealing region  281 A to obtain the light through hole  200 A penetrating through the drive circuit layer  26 A and the filter layer  251 A. 
     According to other embodiments of the present invention, the order of perforating the liquid crystal layer  28 A may be: perforating the filter layer  251 A and then perforating the drive circuit layer  26 A. 
     For example, a perforated region  282 A of the filter layer  251 A may be perforated, and a sealing material  2811 A may be then provided around the perforated region  282 A to form the sealing region  281 A. The liquid crystal  252 A is filled outside the sealing region  281 A and cannot flow into the sealing region  281 A through the sealing material  2811 A under the obstruction of the sealing material  2811 A. That is, the liquid crystal  252 A cannot flow to the position of the light through hole  200 A after the perforating so as to help ensure a lighting effect of the light through hole  200 A in a subsequent step. 
     After the filter layer  251 A is perforated, the filter layer  251 A is mounted to the drive circuit layer  26 A while the sealing material  2811 A provided to the filter layer  251 A is closely attached to the drive circuit layer  26 A, and the sealing material  2811 A forms the sealing region  281 A. 
     The drive circuit layer  26 A is then perforated in alignment with the perforated region  282 A of the filter layer  251 A. After the drive circuit layer  26 A is perforated, the liquid crystal  252 A in the sealing region  281 A can flow to the outside. 
     Further, the entire display screen  20 A may be perforated after mounting other layers of the display screen  20 A, for example, the encapsulation layer  24 A, the polarization layer  23 A, the touch layer  22 A, and the back plate layer  27 A, so that the light through hole  200 A of the filter layer  251 A penetrates through the layers of the display screen  20 A other than the cover plate layer  21 A. 
     In the process of mounting other layers of the display screen  20 A, the layers which have been mounted in alignment are perforated. For example, after the polarization layer  23 A and the touch layer  22 A are mounted, the polarization layer  23 A and the touch layer  22 A are perforated so that the light through hole  200 A of the filter layer  251 A penetrates through the layers of the display screen  20 A other than the cover plate layer  21 A. The cover plate layer  21 A is then mounted to obtain the complete display screen  20 A. 
     According to other embodiments of the present invention, the order of perforating the liquid crystal layer  28 A may be: perforating the filter layer  251 A and the drive circuit layer  26 A simultaneously. 
     For example, the sealing material  2811 A is provided between the filter layer  251 A and the drive circuit layer  26 A. The sealing material  2811 A may be provided to the filter layer  251 A or the drive circuit layer  26 A or both of the filter layer  251 A and the drive circuit layer  26 A. 
     The perforated region  282 A is formed within the sealing region  281 A. After the liquid crystal layer  28 A is perforated, at least a part of the sealing material  2811 A remains between the filter layer  251 A and the drive circuit layer  26 A to prevent the liquid crystal  252 A between the filter layer  251 A and the drive circuit layer  26 A from flowing out. 
     The process of perforating the liquid crystal layer  28 A may be: providing the sealing material  2811 A on the drive circuit layer  26 A and then filling the drive circuit layer  26 A with a liquid crystal  252 A material. The liquid crystal  252 A material is located outside the sealing region  281 A formed by the sealing material  2811 A. 
     It will be understood that the sealing material  2811 A may be transparent or have a high transmittance to facilitate the propagation of light at the position of the light through hole  200 A corresponding to the liquid crystal layer  28 A. The sealing material  2811 A may be a light-shielding material to reduce the influence of stray light near the position of the light through hole  200 A corresponding to the liquid crystal layer  28 A on the light through effect of the light through hole  200 A. That is, the type of the sealing material  2811 A may be selectively set as required. 
     The filter layer  251 A is then mounted to the drive circuit layer  26 A. The sealing material  2811 A, the drive circuit layer  26 A, and the filter layer  251 A form one sealing region  281 A therebetween. For the sealing region  281 A, the liquid crystal  252 A outside the sealing region  281 A cannot flow into the sealing region  281 A. 
     After the filter layer  251 A and the drive circuit layer  26 A are mounted together to form the liquid crystal layer  28 A, the liquid crystal layer  28 A may be perforated, or after the entire display screen  20 A is mounted, the entire display screen  20 A is perforated in alignment with the sealing region  281 A. 
     Further, it will be understood that after the liquid crystal layer  28 A is perforated, the order of perforating the other layers of the display screen  20 A may be selected as required. The encapsulation layer  24 A may be mounted to the liquid crystal layer  28 A, and the encapsulation layer  24 A is then perforated in alignment with the liquid crystal layer  28 A. The touch layer  22 A is then mounted to the encapsulation layer  24 A, and the touch layer  22 A is then perforated in alignment with the liquid crystal layer  28 A and the encapsulation layer  24 A. 
     After the layers above the liquid crystal layer  28 A are mounted, the layers above the liquid crystal layer  28 A may be uniformly perforated. After the layers below the liquid crystal layer  28 A are mounted, the layers below the liquid crystal layer  28 A are then uniformly perforated. 
     The layers of the display screen  20 A may also be pre-drilled and then mounted in alignment with the liquid crystal layer  28 A. 
     Further, if the entire LCD screen  20 A needs to be perforated, that is, when the entire LCD screen  20 A is perforated in the case where the cover plate layer  21 A is also perforated, the polarization layer  23 A is made of an opaque material, and the cover plate layer  21 A and the touch layer  22 A may be made of a light transmitting material. The opaque material obstructs the view of the sealing region  281 A of the liquid crystal layer  28 A from the outside of the display screen  20 A, thereby not facilitating perforating in alignment with the sealing region  281 A. Therefore, the polarization layer  23 A may be perforated. The cover plate layer  21 A is then perforated so that the cover plate layer  21 A can be perforated based on the portion of the light through hole  200 A of the polarization layer  23 A at the time of being perforated, and the portions of the light through hole  200 A of the layers can be aligned with each other. 
     Referring to  FIG. 13 , a specific implementation mode of the LCD screen  20 A according to the present invention is illustrated. In the above embodiment, the inner diameters of the portions of the light through hole  200 A corresponding to the layers of the LCD screen  20 A are of the same size. 
     In the present embodiment, the inner diameters of the portions of the light through hole  200 A corresponding to the layers of the LCD screen  20 A are of different sizes. 
     After the liquid crystal layer  28 A is formed, the encapsulation layer  24 A, the polarization layer  23 A, the touch layer  22 A, and the cover plate layer  21 A may be mounted above the liquid crystal layer  28 A, and another polarization layer  23 A and the back plate layer  27 A may be mounted below the liquid crystal layer  28 A. The back plate layer  27 A of the LCD screen  20 A is indispensable, and the back plate layer  27 A can emit light when energized. 
     The liquid crystal layer  28 A may be perforated in advance, and the encapsulation layer  24 A, the polarization layer  23 A, the touch layer  22 A, and the cover plate layer  21 A are then mounted. The encapsulation layer  24 A, the polarization layer  23 A, and the touch layer  22 A may be perforated in advance or may be uniformly perforated after being mounted together. Another polarization layer  23 A mounted below the liquid crystal layer  28 A may be perforated in advance or perforated after being mounted to the liquid crystal layer  28 A. The cover plate layer  21 A may be mounted to the touch layer  22 A after the other layers of the display screen  20 A are perforated, or after the layers including the cover plate layer  21 A are mounted together, the layers of the display screen  20 A other than the cover plate layer  21 A may be perforated. 
     The inner diameter of the portion of the light through hole  200 A corresponding to the liquid crystal layer  28 A may be different from the inner diameters of the other layers of the display screen  20 A. For example, in the present example, the inner diameter of the portion of the light through hole  200 A corresponding to the liquid crystal layer  28 A is slightly smaller than that corresponding to the encapsulation layer  24 A, the polarization layer  23 A, and the touch layer  22 A. 
     In other embodiments of the present invention, the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, and the liquid crystal layer  28 A of the LCD screen  20 A from top to bottom may obtain the light through hole  200 A with a uniform inner diameter by a process of laser cutting, drilling, etc. 
     For the back plate layer  27 A located below the liquid crystal layer  28 A, the back plate layer  27 A may be separately perforated, and the inner diameter of the portion of the light through hole  200 A corresponding to the back plate layer  27 A may be different from the inner diameters of the portions of the light through hole  200 A corresponding to the liquid crystal layer  28 A, the touch layer  22 A, and the polarization layer  23 A. 
     In the present example, the inner diameter of the portion of the light through hole  200 A corresponding to the back plate layer  27 A is larger than that of the portion of the light through hole  200 A corresponding to the liquid crystal layer  28 A. The portion of the light through hole  200 A corresponding to the back plate layer  27 A is communicated with the portion of the light through hole  200 A corresponding to the liquid crystal layer  28 A. 
     The display screen  20 A has a mounting channel  201 A. The mounting channel  201 A is formed on the back plate layer  27 A and is communicated with the light through hole  200 A. 
     Optionally, the portion of the light through hole  200 A corresponding to the back plate layer  27 A is larger than the sealing region  281 A. At least a part of the camera module  30  may be accommodated in the back plate layer  27 A to facilitate reduction of the height sizes of the camera module  30  and the display screen  20 A. 
     Further, with reference to  FIG. 9 , a mounting end of the camera module  30  includes a portion of lens and lens barrel. The portion of the light through hole  200 A of the back plate layer  27 A may be designed to be large enough to accommodate the portions of the lens and the lens barrel. For the portions of the light through hole  200 A corresponding to the liquid crystal layer  28 A and each layer above the liquid crystal layer  28 A, the aperture size of the light through hole  200 A may meet the light entering requirements of the camera module  30 . In other words, when the camera module  30  extends into the LCD screen  20 A, the camera module  30  is mounted in the LCD screen  20 A, so that the mounting height of the camera module  30  and the LCD screen  20 A is reduced. The light through hole  200 A located above can still be designed to be small enough so that the light through hole  200 A is not easily observed outside the display screen  20 A, and the light through hole  200 A may provide a sufficient mounting space for the camera module  30 . 
     It will be understood that the camera module  30  can not only be accommodated in the portion of the light through hole  200 A corresponding to the back plate layer  27 A, and the camera module  30  can also penetrate further into the LCD screen  20 A. For example, the camera module  30  may be further accommodated in the portion of the light through hole  200 A corresponding to the drive circuit layer  26 A. 
     Referring to  FIG. 14A , a specific implementation mode of the LCD screen  20 A according to the present invention is illustrated. 
     In the present embodiment, the cover plate layer  21 A of the display screen  20 A is not perforated. The touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27  may be perforated respectively, and the protective material  2812  may be then filled at the perforating position. 
     The light entering quality of the camera module  30  is influenced by the light through hole  200 A. Specifically, the materials of the layers of the LCD screen  20 A around the light through hole  200 A may reflect and refract light entering the light through hole  200 A, so that light entering the camera module  30  is influenced by the materials around the light through hole  200 A. 
     Based on different materials of the layers and different positions of the light through holes  200 A, it is difficult to achieve the same level of the materials around each of the light through holes  200 A on the production line, that is, it is difficult to keep the light entering quality of the light through holes  200 A consistent, debugging is required at a later stage. 
     In the present example, after obtaining the LCD screen  20 A with the light through hole  200 A, certain amount of protective material  2812 A may be poured into the light through hole  200 A. The protective material  2812 A may protect the layers around the light through hole  200 A, such as the drive circuit layer  26 A, to reduce corrosion of the drive circuit layer  26 A by water and oxygen. 
     After the protective material  2812 A is filled in the light through hole  200 A, at least a part of the protective material  2812 A may be removed by means of drilling or laser cutting so that at least a part of the position around the light through hole  200 A is filled with the protective material  2812 A. 
     The protective material  2812 A may be a light transmitting material, and light may be transmitted through the protective material  2812 A. The protective material  2812 A may be an opaque material, and stray light around the light through hole  200 A may not be received by the camera module  30  through the protective material  2812 A. The material of the protective material  2812 A may be selected based on requirements to control the light entering quality of the light through hole  200 A by controlling the protective material  2812 A in the light through hole  200 A. 
     It is worth mentioning that when there is a certain deviation in the portions of the light through hole  200 A corresponding to the layers due to a machining process or a mounting process, the portions of the light through hole  200 A corresponding to the layers may be compensated to a certain extent by the protective material  2812 A. 
       FIG. 14B  is another implementation mode of the LCD screen  20 A according to the present invention. The difference from the display screen  20 A shown in  FIG. 14A  is that in the present implementation mode, the layers of the display screen  20 A are separately perforated and then filled with the protective material  2812 A. 
     Specifically, the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A may be perforated respectively, and the protective material  2812 A may be then filled at the perforating position. 
     The touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A are then mounted together in alignment to form the display screen  20 A. At this moment, the display screen  20 A may be used as a display screen with a “hole”. Transparent materials corresponding to the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A may function as holes. 
     Further, the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A are perforated simultaneously, and a part of the protective material  2812 A may be left around the light through hole  200 A. The cover plate layer  21 A is then mounted to obtain the display screen  20 A. 
     Referring to  FIGS. 15 and 16 , a specific implementation mode of the LCD screen  20 A according to the present invention is illustrated. 
     The portion of the light through hole  200 A corresponding to the liquid crystal layer  28 A, the portion of the light through hole  200 A corresponding to the polarization layer  23 A, and the portion of the light through hole  200 A corresponding to the cover plate layer  21 A are not aligned, which may be caused by various factors such as factors that control the accuracy of a perforating position in the perforating process, or factors that control the accuracy of alignment in the mounting process, or factors that cause deviation when fixing in the mounting process. 
     The protective material  2812 A is poured into the light through hole  200 A, the protective material  2812 A fills the light through hole  200 A, and at least a part of the protective material  2812 A is then removed according to a certain perforating region  282 A to reform the light through hole  200 A. At this moment, the inner diameter of the light through hole  200 A can be kept uniform. 
     It will be certainly understood that in the present example, after the entire LCD screen  20 A is mounted, the light through hole  200 A is re-processed. In other embodiments of the present invention, the light through hole  200 A may be adjusted after some functional layers of the LCD screen  20 A are mounted together. 
     For example, when the liquid crystal layer  28 A, the polarization layer  23 A, and the touch layer  22 A are assembled together, the portions of the light through hole  200 A corresponding to the liquid crystal layer  28 A, the polarization layer  23 A, and the touch layer  22 A have a certain deviation, the portions of the light through hole  200 A corresponding to the liquid crystal layer  28 A, the polarization layer  23 A, and the touch layer  22 A may be filled with the protective material  2812 A, and the light through hole  200 A is then formed secondarily. Another polarization layer  23 A and a backlight plate are then mounted to the liquid crystal layer  28 A. 
     The protective material  2812 A may not cover the portions of the light through hole  200 A corresponding to the polarization layer  23 A and the back plate layer  27 A, referring to  FIG. 15 . 
     In this way, the protective material  2812 A may selectively cover the layers of the LCD screen  20 A. 
     Referring to  FIG. 17 , a specific implementation mode of the LCD screen  20 A according to the present invention is illustrated. 
     The LCD screen  20 A has a light through hole  200 A, and a light guide assembly  50 A is provided in the light through hole  200 A. The light guide assembly  50 A has a light guide channel  500 A, and light can pass through the LCD screen  20 A along the light guide channel  500 A. 
     Specifically, the LCD screen  20 A includes a cover plate layer  21 A, a touch layer  22 A, a polarization layer  23 A, an encapsulation layer  24 A, a pixel layer  25 A, a drive circuit layer  26 A, and a back plate layer  27 A. The polarization layer  23 A is located on opposite sides of the pixel layer  25 A respectively. 
     The cover plate layer  21 A is located on the top of the LCD screen  20 A. The touch layer  22 A can transmit a signal when being touched. The encapsulation layer  24 A is used for encapsulation. The pixel layer  25 A includes a filter layer  251 A (CF) and a liquid crystal  252 A. The liquid crystal  252 A is located between the filter layer  251 A and the drive circuit layer  26 A. The drive circuit layer  26 A includes a plurality of TFT structures and the substrate base. The TFT structures are formed on the substrate base by the steps of thin film forming, yellow lighting, etching, stripping, etc. The back plate layer  27 A is configured to emit light. 
     The LCD screen  20 A further includes a liquid crystal layer  28 A. The liquid crystal layer  28 A includes the liquid crystal  25 A and the drive circuit layer  26 A. The liquid crystal  252 A is located between the filter layer  251 A and the drive circuit layer  26 A. 
     The light through hole  200 A penetrates through the layers of the LCD screen  20 A, and the light guide assembly  50 A is accommodated in the light through hole  200 A. 
     The light through hole  200 A may be formed by perforating each layer of the LCD screen  20 A, or formed by perforating the liquid crystal layer  28 A of the LCD screen  20 A, closing the liquid crystal layer  28 A to prevent the liquid crystal  252 A in the liquid crystal layer  28 A from leaking to the outside, and then perforating the other layers of the LCD screen  20 A. 
     In the former manner, specifically, the liquid crystal layer  28 A is pre-processed during manufacturing to form a sealing region  281 A. The sealing region  281 A is unfilled with the liquid crystal  252 A. The liquid crystal  252 A is located outside the sealing region  281 A. For example, a sealing material  2811 A may be provided between the filter layer  251 A and the drive circuit layer  26 A to form the sealing region  281 A. 
     In the latter manner, specifically, the liquid crystal layer  28 A is pre-processed during manufacturing to form a sealing region  281 A. The sealing region  281 A is unfilled with the liquid crystal  252 A. The liquid crystal  252 A is located outside the sealing region  281 A. For example, a sealing material  2811 A may be provided between the filter layer  251 A and the drive circuit layer  26 A to form the sealing region  281 A. 
     The liquid crystal layer  28 A is then perforated based on the sealing region  281 A. The other layers of the LCD screen  20 A are then aligned with the liquid crystal layer  28 A for perforating. 
     In the present example, the inner diameter of the light through hole  200 A may be set slightly larger to accommodate the light guide assembly  50 A. It is worth noting that when the portions of the light through hole  200 A corresponding to the layers of the LCD screen  20 A slightly deviate, the light guide assembly  50 A can supplement, to some extent, the deviation between the layers caused by the LCD screen  20 A during mounting. 
     Specifically, when the portions of the light through hole  200 A corresponding to the layers of the LCD screen  20 A slightly deviate, at least a part of light entering the light through hole  200 A is lost when being transferred in the light through hole  200 A. When the light guide assembly  50 A is provided in the light through hole  200 A, most of the light can propagate directly along the light guide channel  500 A of the light guide assembly  50 A, thereby reducing the loss of light in the LCD screen  20 A due to a mounting deviation between the layers. 
     The light guide performance of the light guide assembly  50 A may be set based on requirements. When the light guide efficiency requirement for the light guide assembly  50 A is high, the light guide assembly  50 A may be provided as a transparent material. When it is required to reduce the influence of external stray light on the light in the light guide channel  500 A, an outer wall of the light guide assembly  50 A may be coated with a light-shielding material. 
     Referring to  FIGS. 18A and 18B , an implementation mode of the terminal device  1  based on the present invention is illustrated. 
     The terminal device  1  includes a terminal device body  10 , a display screen  20 , and a camera module  30 . The display screen  20  and the camera module  30  are provided to the terminal device body  10  respectively. The display screen  20  is configured to display an image, and the camera module  30  is held below the display screen  20  to facilitate the design of the display screen  20  as a full screen. 
     The terminal device  1  further includes a housing  40  and has a light guide channel  500 . The display screen  20  is mounted to the housing  40 . The housing  40  is located at the periphery of the display screen  20  for supporting the display screen  20  and also protecting the display screen  20 . 
     The light guide channel  500  is formed between the display screen  20  and the housing  40 . The light guide channel  500  conducts the outside and the camera module  30 , so that external light is conducted to the camera module  30  via the light guide channel  500 . 
     In this way, the camera module  30  can be provided below the display screen  20  without occupying a display region of the display screen  20 , so that the display screen  20  can achieve the effect of a full screen. 
     Specifically, the terminal device  1  has at least one light guide channel  500 . At least a part of the light guide channel  500  is formed between the display screen  20  and the housing  40 , and at least a part of the light guide channel  500  is formed in the display screen  20 , so as to transfer light to the camera module  30  located below the display screen  20 . Some light guide elements may be provided in the light guide channel  500  so that a propagation direction of light linearly propagating can be changed, and the light is conducted from the outside of the display screen  20  to the camera module  30  located inside the display screen  20  via the light guide channel  500 . The light guide element may be a reflecting film or a reflecting mirror. 
     In other embodiments of the present invention, at least a part of the light guide channel  500  is located between the display screen  20  and the housing  40 , and the remaining part may be located below the display screen  20 . That is, the light guide channel  500  bypasses the side surface of the display screen  20  to reach below the display screen  20 , and then guides light to the camera module  30 . 
     In the present example, taking an OLED display screen  20  as an example, the light guide channel  500  may selectively be formed on the layers of the OLED display screen  20 , such as the pixel layer  25 , the drive circuit layer  26 , or the back plate layer  27 . Preferably, when the light guide channel  500  penetrates through the pixel layer  25 , the light guide channel  500  is provided between the adjacent pixels to reduce the influence on an imaging effect. Preferably, when the light guide channel  500  penetrates through the drive circuit layer  26 , the light guide channel  500  is provided to a non-circuit part of the drive circuit layer  26  to reduce the influence on the working performance of the drive circuit layer  26 . 
     In the present example, the light guide channel  500  penetrates through the back plate layer  27 , and light is then transferred to the camera module  30  located below the display screen  20  via the light guide channel  500 . 
     The light guide channel  500  includes a first partial light guide channel  501 , a second partial light guide channel  502 , and a third partial light guide channel  503 . The first partial light guide channel  501  is located between the display screen  20  and the housing  40 . It is worth noting that when the display screen  20  is mounted to the housing  40 , a gap naturally exists between the display screen  20  and the housing  40 . The desired first partial light guide channel  501  may be obtained by designing an edge of the display screen  20  or an edge of the housing  40 . 
     The second partial light guide channel  502  is located in the display screen  20 , and the third partial light guide channel  503  is located in the display screen  20 . The second partial light guide channel  502  is configured to transfer light from the outside into the display screen  20  via the first partial light guide channel  501 . The third partial light guide channel  503  is configured to transfer light in the display screen  20  outward to the camera module  30 . 
     The second partial light guide channel  502  may conduct light along a length-width direction of the display screen  20 , and the third partial light guide channel  503  may conduct light along a height direction of the display screen  20 . 
     Further, the first partial light guide channel  501  of the light guide channel  500  may serve to converge light so that more light enters the second partial light guide channel  502  after passing through the first partial light guide channel  501 . The second partial light guide channel  502  may serve to transfer light. 
     In the present example, the camera module  30  is mounted to the display screen  20  and located below the display screen  20 . The camera module  30  images based on the light of the light guide channel  500 . The third partial light guide channel  503  may be configured to diffuse light so that the diffused light matches a light receiving region of the camera module  30 . 
     The first partial light guide channel  501  may be provided with a micro-convex lens to converge light. The second partial light guide channel  502  may be provided with at least one reflecting mirror or other modulating devices so that light is transferred along the second partial light guide channel  502  to the third partial light guide channel  503 . The third partial light guide channel  503  may be provided with a micro-concave lens to enable light to be diffused. 
     Further, the camera module  30  includes an optical unit  31 A and a photosensitive unit  32 A. The optical unit  31 A collects light, and the photosensitive unit  32 A receives the light collected by the optical unit  31 A and converts an optical signal into an electrical signal based on photoelectric conversion for subsequent imaging. The optical unit  31 A may include a converging member  311 A, a modulating member  312 A, and a diffusing member  313 A. The converging member  311 A can converge light. The modulating member  312 A can modulate light, such as filtering, dispersing, or collimating. The diffusing member  313 A can diffuse light. 
     The optical unit  31 A may be provided to the light guide channel  500 , such as the first partial light guide channel  501 , the second partial light guide channel  502 , and the third partial light guide channel  503 . The photosensitive unit  32 A is provided directly to the display screen  20  and located below the display screen  20 . After the light is collected by the optical unit  31 A, the photosensitive unit  32 A converts an optical signal into an electrical signal. 
     Specifically, the converging member  311 A may be provided to the first partial light guide channel  501  for converging light entering the light guide channel  500  from the outside so that an inner diameter of the second partial light guide channel  502  can be designed to be small while transferring more light. The modulating member  312 A may be provided to the second partial light guide channel  500 . The diffusing member  313 A may be provided to the third partial light guide channel  503  to diffuse light to a photosensitive region corresponding to the photosensitive unit  32 A of the camera module  30 . 
     In this way, the portion of the light guide channel  500  in the display screen  20  may be set to a small size to reduce the influence of the light guide channel  500  on the imaging of the display screen  20 . The manufacture and formation of the light guide channel  500  in the display screen  20  may be as previously described. 
     The optical unit  31 A may include, but is not limited to, a concave lens, a convex lens, and other optical components. 
     Further, in other embodiments of the present invention, the concave lens located in the third partial light guide channel  503  may be provided to the display screen  20 . For example, taking the encapsulation layer  24  as an example, the diffusing member  313 A is provided to the encapsulation layer  24 . External light is diffused after passing through the diffusing member  313 A of the encapsulation layer  24 , and then transferred to the photosensitive unit  32 A of the camera module  30  via the third partial light guide channel  503 , thereby being converted into an electrical signal. 
     The diffusing member  313 A may be integrally formed on the encapsulation layer  24 . The encapsulation layer  24  is usually made of glass. According to some embodiments of the present invention, the diffusing member  313 A may be concavely integrally formed on a top surface of the encapsulation layer  24 . 
     Referring to  FIGS. 19 and 18A , another specific implementation mode of the terminal device  1  according to the present invention is illustrated. 
     In the present example, the terminal device  1  includes a terminal device body  10 , a display screen  20 , and a camera module  30 . The display screen  20  and the camera module  30  are provided to the terminal device body  10  respectively. The display screen  20  is configured to display an image, and the camera module  30  is held below the display screen  20  to facilitate the design of the display screen  20  as a full screen. 
     The terminal device  1  further includes a housing  40  and has a light guide channel  500 . The display screen  20  is mounted to the housing  40 . The housing  40  is located at the periphery of the display screen  20  for supporting the display screen  20  and also protecting the display screen  20 . 
     At least a part of the light guide channel  500  is located between the display screen  20  and the housing  40 , and extends to the display screen  20 . External light passes through the gap between the display screen  20  and the housing  40 , reaches the display screen  20 , and is then received by the camera module  30  located below the display screen  20 . 
     The terminal device  1  further includes an optical unit  31 A. The optical unit  31 A is provided to the light guide channel  500 . The optical unit  31 A may serve to converge, diffuse, or collimate light. 
     The camera module  30  includes an optical mechanism  31 A′ and a photosensitive unit  32 A. The optical mechanism  31 A′ is held in a photosensitive path of the photosensitive unit  32 A. The photosensitive unit  32 A can convert an optical signal into an electrical signal based on photoelectric conversion. The optical mechanism  31 A′ may include an optical lens or other elements. 
     In the present example, the camera module  30  is a single complete camera module  30 . With the optical unit  31 A not provided in the light guide channel  500 , the camera module  30  may still image based on light passing through the light guide channel  500 . 
     Some light guide elements may be provided in the light guide channel  500  so that a propagation direction of light linearly propagating can be changed, and the light is conducted from the outside of the display screen  20  to the camera module  30  located inside the display screen  20  via the light guide channel  500 . The light guide element may be a reflecting film or a reflecting mirror. 
     The light guide channel  500  may include a first partial light guide channel  501 , a second partial light guide channel  502 , and a third partial light guide channel  503 . The first partial light guide channel  501  is located between the housing  40  and the display screen  20 . The second partial light guide channel  502  guides light of the first partial light guide channel  501  into the display screen  20 . The third partial light guide channel  503  guides light of the second partial light guide channel  502  out of the display screen  20  to be received by the camera module  30 . 
     The optical unit  31 A may be provided to the first partial light guide channel  501 , the second partial light guide channel  502 , and the third partial light guide channel  503 . 
     It will be understood that the type and position of the optical unit  31 A may be selected as required so that light can be adjusted to meet the light entering requirements of the camera module  30  under the action of the optical unit  31 A when passing through the light guide channel  500  of the light guide assembly  50 . 
     Referring to  FIGS. 20 and 18A , another preferred implementation mode of the terminal device  1  according to the present invention is illustrated. 
     In the present example, the terminal device  1  includes a terminal device body  10 , a display screen  20 , a camera module  30 , a housing  40 , and a light guide assembly  50 . The display screen  20  is mounted to the terminal device body  10 . The display screen  20  and the terminal device body  10  are mounted to the housing  40 . The camera module  30  is mounted to the display screen  20  and held below the display screen  20 . The light guide assembly  50  is configured to conduct external light to the camera module  30  below the display screen  20 . 
     Specifically, the terminal device  1  has a light guide channel  500 . At least a part of the light guide channel  500  is formed in the light guide assembly  50 . 
     At least a part of the light guide channel  500  is located between the display screen  20  and the housing  40 , and extends to the display screen  20 . External light passes through the gap between the display screen  20  and the housing  40 , reaches the display screen  20 , and is then received by the camera module  30  located below the display screen  20 . 
     The light guide assembly  50  includes a light guide conduit which has a certain shape and size. The light guide conduit may extend from the outside of the display screen  20  to the display screen  20  between the display screen  20  and the housing  40 . 
     The entire light guide conduit may be light-transmitting or opaque. The light guide conduit may be made of a light-transmitting material. Then, in order to prevent stray light around the light guide conduit from entering the light guide channel  500 , the light guide conduit may be coated with a light-shielding material so as to reduce the influence of stray light around. 
     Preferably, when the light guide assembly  50  needs to penetrate through the pixel layer  25 , the light guide assembly  50  is provided between two adjacent pixels of the pixel layer  25 . 
     For the same display screen  20 , there may be a plurality of light guide assemblies  50 , there may be a plurality of corresponding light guide channels  500 , and at least a part of the plurality of light guide channels  500  coincide with each other. 
     The light guide assembly  50  may conduct the interior of the display screen  20  to a plurality of positions outside the display screen  20 , e.g., in front of the display screen  20 , to the left side of the display screen  20 , or to the right side of the display screen  20 . The light guide channel  500  of the light guide assembly  50  can conduct light passing through the gap between the display screen  20  and the housing  40  to the camera module  30 . 
     When there are a plurality of light guide channels  500 , the light entering amount of the camera module  30  may be increased. 
     Referring to  FIGS. 21 and 18A , another implementation mode of the terminal device  1  according to the present invention is illustrated. 
     The terminal device  1  includes a terminal device body  10 , a display screen  20 , a camera module  30 , a housing  40 , and a light guide assembly  50 . The display screen  20  is mounted to the terminal device body  10 . The display screen  20  and the terminal device body  10  are mounted to the housing  40 . The camera module  30  is mounted to the display screen  20  and held below the display screen  20 . The light guide assembly  50  is configured to conduct external light to the camera module  30  below the display screen  20 . 
     The terminal device  1  has at least one light guide channel  500  and a light through hole  200 . The light through hole  200  penetrates through the display screen  20  of the terminal device  1  from top to bottom. The light guide channel  500  is formed on the light guide assembly  50 . The light guide channel  500  extends downward from the gap between the display screen  20  and the housing  40  of the terminal device  1  to the display screen  20 . 
     Both of the light guide channel  500  and the light through hole  200  may be configured to conduct light. The light through hole  200  penetrates through the display screen  20 , and the camera module  30  aligned with the light through hole  200  of the display screen  20  can receive light from the outside of the display screen  20  via the light through hole  200 . The camera module  30  aligned with the light guide channel  500  can receive light from the outside of the display screen  20  via the light guide channel  500 . 
     It is worth noting that the light guide channel  500  and the light through hole  200  may be independent from each other, and the light guide channel  500  and the light through hole  200  may be aligned with different camera modules  30  respectively. In other words, the plurality of camera modules  30  may be mounted to the display screen  20  and located below the display screen  20 . 
     In the present example, the light guide channel  500  and the light through hole  200  at least partially coincide with each other, so that light received by the light guide channel  500  and the light through hole  200  may enter the same camera module  30  and be received by the same photosensitive unit  32 A, so as to image. 
     Specifically, at least a part of the light guide channel  500  is located between the display screen  20  and the housing  40 , and at least a part of the light guide channel  500  is located in the display screen  20 . 
     The light guide channel  500  may include a first partial light guide channel  501 , a second partial light guide channel  502 , and a third partial light guide channel  503 . The first partial light guide channel  501  is located between the display screen  20  and the housing  40 . The second partial light guide channel  502  and the third partial light guide channel  503  are located within the display screen  20  respectively. 
     The light guide channel  500  is communicated with the light through hole  200 , and the third partial light guide channel  503  and the light through hole  200  coincide. 
     The first partial light guide channel  501  is located on one side of the display screen  20 , the second partial light guide channel  502  extends inward from the side surface of the display screen  20 , and the third partial light guide channel  503  extends from the interior of the display screen  20  to the back side of the display screen  20 . 
     The terminal device  1  further includes an optical unit  31 A. The optical unit  31 A is provided to the light guide channel  500 . The optical unit  31 A may include a converging member  311 A, a modulating member  312 A, and a diffusing member  313 A. The converging member  311 A may be provided to the first partial light guide channel  501  for converging external light. The modulating member  312 A may be provided to the second partial light guide channel  502  for modulating light from the first partial light guide channel  501 . The diffusing member  313 A may be provided to the third partial light guide channel  503  for diffusing and transferring light to the camera module  30 . 
     It is worth noting that since the paths of light entering the camera module  30  for imaging through the light guide channel  500  and the light through hole  200  are different, light of different paths has an optical path difference when reaching the camera module  30 . Beams simultaneously reaching a photosensitive chip of the camera module  30  have different phases and may eventually present different images. In order to avoid this problem, the optical path formed by the optical unit  31 A in the display screen  20  is designed such that light reaching the camera module  30  may present consistent images. 
     In the present example, the camera module  30  includes an optical mechanism  31 A′ and a photosensitive unit  32 A. The optical mechanism  31 A′ is aligned with the light through hole  200  and the light guide channel  500 , and the optical mechanism  31 A′ is held in a photosensitive path of the photosensitive unit  32 A. At least parts of the light through hole  200  and the light guide channel  500  are shared by each other. 
     In other embodiments of the present invention, the camera module  30  includes the optical unit  31 A and a photosensitive unit  32 A. The optical unit  31 A is provided to the light guide channel  500  and the photosensitive unit  32 A is mounted on a back side of the display screen  20 . 
     In the case where the light guide channel  500  and the light through hole  200  coexist, since the camera module  30  receives light via the light guide channel  500 , the light through hole  200  may be design to be smaller. 
     The light guide channel  500  may not be observed from the outside of the display screen  20 . For example, when the second partial light guide channel  502  is located at the encapsulation layer  24  of the display screen  20 , the light guide channel  500  may not be observed outside the display screen  20  due to the polarization layer located above the encapsulation layer  24 . Therefore, the inner diameter of at least a part of the light guide channel  500  may be designed to be slightly larger than the inner diameter of the light through hole  200 , so that a part of the optical element may be placed in the light guide channel  500 . 
     When the light through hole  200  is designed to be small size, it is more difficult to observe the light through hole  200  from the outside of the display screen  20 , so as to facilitate increase of a screen-to-body ratio of the display screen  20 . 
     Further, for the light through hole  200 , the inner diameter of the light through hole  200  may be set to be gradually increased from top to bottom. A part of the optical elements of the optical unit  31 A may be provided to the light through hole  200 , e.g., the diffusing member  313 A. 
     For example, when a light through region provided by the light through hole  200  is smaller than a light receiving region of the photosensitive unit  32 A of the camera module  30 , one of the diffusing members  313 A may be provided to the light through hole  200 . The diffusing member  313 A may diffuse light in the light through hole  200  so that the light through region provided by the light through hole  200  matches the light receiving region of the photosensitive unit  32 A. 
     Referring to  FIGS. 22 and 18A , an implementation mode of a display screen assembly according to the present invention is illustrated. 
     In the present embodiment, the present invention provides a display screen assembly, which includes a display screen  20  and a light guide assembly  50 . The display screen  20  has a light through hole  200  penetrating from top to bottom, and the light guide assembly  50  is partially accommodated in the light through hole  200 . 
     The light guide assembly  50  provides a light guide channel  500 . The desired light guide channel  500  may be obtained by designing the shape and structure of the light guide assembly  50 . 
     The light guide assembly  50  includes two light guide conduits. One of the light guide conduits is accommodated in the light through hole  200 , and the other light guide conduit extends from the gap between the display screen  20  and the housing  40  to the position of the light through hole  200 . That is, one of the light guide conduits can guide light above the display screen  20  to pass through the display screen  20  from top to bottom and then to reach the camera module  30 . The other light guide conduit can guide light between the display screen  20  and the housing  40  to reach the camera module  30 . The way in which the light through hole  200  is made may be described with reference to the foregoing description. 
     The light guide conduit may be cylindrical, triangular prism-shaped, or quadrangular prism-shaped. The inner diameters corresponding to all positions of the light guide conduit may be different. 
     The light guide conduit may be made of a light-transmitting material, so that the light guide conduit is difficult to observe from the outside of the display screen  20 . Meanwhile, in order to reduce the influence of stray light, e.g., the influence of light from the pixel layer  25  of the display screen  20 , the light guide conduit may be coated with a light-shielding material. 
     Further, the light guide assembly  50  includes an optical unit  31 A. The optical unit  31 A is held in a light through path of the light through hole  200 . The optical element may be a filtering member, a diffusing member  313 A, or a modulating member  312 A. The optical unit  31 A may pre-process light to achieve desired light entering the camera module  30 . 
     It is worth noting that since the paths of light entering the camera module  30  for imaging through the different light guide channels  500  are different, light of different paths has an optical path difference when reaching the camera module  30 . Beams simultaneously reaching a photosensitive chip of the camera module  30  have different phases and may eventually present different images. In order to avoid this problem, the optical path formed by the optical unit  31 A in the display screen  20  is designed such that light reaching the camera module  30  may present consistent images. 
     Referring to  FIGS. 23, 18A, and 10 , another implementation mode of the display screen assembly according to the present invention is illustrated. 
     In the present example, a display screen  20  is implemented as an LCD screen  20 A. The LCD screen  20 A has a light guide channel  500 . The light guide channel  500  can guide light outside the LCD screen  20 A to the interior of the LCD screen  20 A or to the inside of the LCD screen  20 A. 
     Specifically, at least a part of the light guide channel  500  is located between the LCD screen  20 A and a housing  40 , and at least a part of the light guide channel  500  is located inside the LCD screen  20 A. 
     The portion of the light guide channel  500  located between the LCD screen  20 A and the housing  40  may guide external light from the outside of the LCD screen  20 A to one side surface of the LCD screen  20 A. The light is then guided into the interior of the LCD screen  20 A by other portions of the light guide channel  500 , and the light reaches the camera module  30  after passing through the interior of the LCD screen  20 A. Thus, the camera module  30  located below the display screen  20 A can receive light above the display screen  20 A, so that the camera module  30  located below the display screen  20 A can use the light to image, and further, the camera module  30  located below the display screen  20 A can obtain sufficient light imaging via the light guide channel  500 . 
     More specifically, the light guide channel  500  includes a first partial light guide channel  501 , a second partial light guide channel  502 , and a third partial light guide channel  503 . The first partial light guide channel  501  is located between the LCD screen  20 A and the housing  40 . The second partial light guide channel  502  is located inside the LCD screen  20 A and guides light from the first partial light guide channel  501  to the inside of the LCD screen  20 A. The third partial light guide channel  503  is located inside the LCD screen  20 A and guides light from the second partial light guide channel  502  to the outside of the LCD screen  20 A. 
     The LCD screen  20 A further includes at least one optical unit  31 A. The optical unit  31 A may be provided to the light guide channel  500  so that light can propagate in the light guide channel  500  according to the user&#39;s expectations. The optical unit  31 A may include a converging member  311 A, a modulating member  312 A, and a diffusing member  313 A. The converging member  311 A can converge light. The modulating member  312 A can modulate light, such as filtering, dispersing, or collimating. The diffusing member  313 A can diffuse light. 
     The converging member  311 A may be provided to the first partial light guide channel  501  of the light guide channel  500 , e.g., at a light entrance of the light guide channel  500 . The converging member  311 A is located at the light entrance. The modulating member  312 A may be provided to the second partial light guide channel  502  of the light guide channel  500  to modulate light passing through the second partial light guide channel  502 . The diffusing member  313 A may be provided to the third partial light guide channel  503  of the light guide channel  500 , e.g., a light exit of the light guide channel  500 . The diffusing member  313 A located at the light exit may diffuse light, so that the light can be adapted to a photosensitive surface of the camera module  30 . Thus, when the photosensitive surface of the camera module  30  is large, the light may be diffused by the diffusing member  313 A to increase a photosensitive region of the entire photosensitive surface, thereby improving the working efficiency of the camera module  30 . 
     The camera module  30  has a light entrance and includes a photosensitive unit  32 A. The size of the light entrance corresponds to the photosensitive region of the photosensitive unit  32 A so that the photosensitive region of the photosensitive unit  32 A receives light as much as possible and the photosensitive region of the photosensitive unit  32 A can be utilized as much as possible. 
     Further, the LCD screen  20 A includes the cover plate layer  21 A, the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A. The polarization layer  23 A may be respectively located on both sides of the pixel layer  25 A. 
     The LCD screen  20 A has a side surface, a front surface, and a back surface. The front surface of the LCD screen  20 A faces a user. The back surface of the LCD screen  20 A faces away from the user. The side surface is connected to the front surface and the back surface, respectively. The light guide channel  500  extends from the gap between the LCD screen  20 A and the housing  40  to the side surface of the LCD screen  20 A, and then extends to the back surface of the LCD screen  20 A. Light can pass through the LCD screen  20 A from the side surface of the LCD screen  20 A to the back surface of the LCD screen  20 A via the light guide channel  500 . 
     The LCD screen  20 A is a multi-layer structure. The light guide channel  500  may penetrate through one or more of the cover plate layer  21 A, the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A. 
     The light guide channel  500  may penetrate through the cover plate layer  21 A and the back plate layer  27 A, e.g., sequentially penetrate through the cover plate layer  21 A, the touch layer  22 A, a polarize sheet of the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, another polarize sheet of the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A described herein is illustrative only and is not limiting of the present invention. 
     The light guide channel  500  may penetrate through the touch layer  22 A and the back plate layer  27 A. For example, the light guide channel  500  sequentially penetrates through the gap between the display screen  20 A and the housing  40 , the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light guide channel  500  may penetrate through the polarization layer  23 A and the back plate layer  27 A. For example, the light guide channel  500  sequentially penetrates through the gap between the display screen  20 A and the housing  40 , the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light guide channel  500  may penetrate through the encapsulation layer  24 A and the back plate layer  27 A. For example, the light guide channel  500  sequentially penetrates through the gap between the display screen  20 A and the housing  40 , the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light guide channel  500  may extend from the pixel layer  25 A to the back plate layer  27 A. For example, the light guide channel  500  sequentially penetrates through the gap between the display screen  20 A and the housing  40 , the pixel layer  25 A, the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light guide channel  500  may extend from the drive circuit layer  26 A to the back plate layer  27 A. For example, the light guide channel  500  sequentially penetrates through the gap between the display screen  20 A and the housing  40 , the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light guide channel  500  may extend from the polarization layer  23 A located below the pixel layer  25 A to the back plate layer  27 A. For example, the light guide channel  500  sequentially penetrates through the polarization layer  23 A and the back plate layer  27 A below the pixel layer  25 A. 
     The light guide channel  500  may penetrate through the back plate layer  27 A. For example, the light guide channel  500  extends from a gap between the back plate layer  27 A and the polarization layer  23 A or a connecting medium to the back plate layer  27 A and penetrates through the back plate layer  27 A. 
     The light guide channel  500  is illustrated as penetrating through the pixel layer  25 A. The pixel layer  25 A includes the filter layer  251 A and the liquid crystal  252 A. The LCD screen  20 A includes a liquid crystal layer  28 A. The liquid crystal layer  28 A includes the liquid crystal  252 A, the filter layer  251 A, and the drive circuit layer  26 A. 
     The liquid crystal  252 A is held between the filter layer  251 A and the drive circuit layer  26 A. The light guide channel  500  penetrates through the liquid crystal layer  28 A, and the liquid crystal  252 A does not leak into the light guide channel  500 . 
     The liquid crystal layer  28 A with a hole may be first manufactured. The hole is at least a part of the light guide channel  500 . Corresponding positions on the layers of the LCD screen  20 A are then perforated to form at least a part of the light guide channel  500 . 
     The hole of the liquid crystal layer  28 A may be located in the height direction of the liquid crystal layer  28 A. The hole may also be obliquely formed on the liquid crystal layer  28 A along a certain oblique angle to adapt to the requirements of the arrangement of the light guide channel  500 . 
     Specifically, a sealing material  2811 A is provided on the drive circuit layer  26 A or the filter layer  251 A of the liquid crystal layer  28 A, so that when the drive circuit layer  26 A and the filter layer  251 A are attached to each other, the sealing material  2811 A forms a sealing region  281 A, and the liquid crystal  252 A cannot enter the sealing region  281 A. In a subsequent step, the liquid crystal  252 A of the liquid crystal layer  28 A does not leak out as long as the liquid crystal layer  28 A is perforated within the sealing region  281 A. 
     The layers mounted above the liquid crystal layer  28 A of the LCD screen  20 A may be perforated respectively to form the light through hole  200  extending from the side surface of the LCD screen  20 A to the back surface of the LCD screen  20 A. In this way, the LCD screen  20 A may be provided with the hole penetrating through the side surface of the LCD screen  20 A and the back surface of the LCD screen  20 A. 
     Further, a part of the light guide channel  500  is located between the display screen  20 A and the housing  40 . A part of the light guide channel  500  is provided inside the LCD screen  20 A. It can be achieved that the light guide channel  500  is not visible from the front side of the LCD screen  20 A, thereby achieving a full screen. 
     Further, after forming the part of the light guide channel  500  in the LCD screen  20 A, the optical unit  31 A may be mounted to the light guide channel  500 . 
     It will be understood that the optical element may be mounted to the light guide channel  500  after the entire LCD screen  20 A has been manufactured, or the optical unit  31 A may be mounted to a preset position on each layer of the LCD screen  20 A in the process of mounting the LCD screen  20 A layer by layer or in the process of forming the portion of the light guide channel  500  corresponding to each layer of the LCD screen  20 A, the functional layers are then assembled to form the complete LCD screen  20 A, and at least a part of the optical unit  31 A may be formed in the process of manufacturing the LCD screen  20 A. 
     For example, firstly, a micro-lens layer is integrally formed on the encapsulation layer  24 A, and the encapsulation layer  24 A is then provided above the pixel layer  25 A. The micro-lens layer corresponds to the light through hole  200  of the pixel layer  25 A. The drive circuit layer  26 A is provided on the bottom side of the pixel layer  25 A. The drive circuit layer  26 A is electrically connected to the pixel layer  25 A for driving the pixel layer  25 A to operate. The polarization layer  23 A, the touch layer  22 A, and the cover plate layer  21 A are sequentially provided on the encapsulation layer  24 A. 
     The through light guide channel  500  is formed among the cover plate layer  21 A, the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, and the drive circuit layer  26 A. The micro-lens layer is held in the light guide channel  500 . 
     The optical unit  31 A may be provided inside the LCD screen  20 A or formed on each layer of the LCD screen  20 A in other ways. It will be understood by those skilled in the art that the above manufacturing method of the optical unit  31 A is by way of example only and is not limited to the above example. 
     Referring to  FIG. 24 , another implementation mode of the LCD screen  20 A according to the present invention is illustrated. 
     In the present example, the camera module  30  includes the photosensitive unit  32 A. The photosensitive unit  32 A directly receives light from the light guide channel  500 . The light may be received by the photosensitive unit  32 A after being processed by the optical unit  31 A located in the light guide channel  500 . 
     In this way, the optical mechanism  31 A′ of the camera module  30  may be provided in the light guide channel  500 , or the optical unit  31 A located in the light guide channel  500  serves as the optical mechanism  31 A′ of the camera module  30  so as to reduce the height size of the camera module  30 , thereby further facilitating reduction of the height sizes of the LCD screen  20 A and the camera module  30 . 
     Referring to  FIG. 25 , another implementation mode of the LCD screen  20 A according to the present invention is illustrated. 
     In the present example, the LCD screen  20 A has at least one light guide channel  500  and the LCD screen  20 A further includes at least one light guide assembly  50 . The light guide channel  500  is formed in the light guide assembly  50 . 
     The LCD screen  20 A provides another light through hole  200 A. The light through hole  200 A is used for mounting the light guide assembly  50 . 
     The LCD screen  20 A is a multi-layer structure. The light through hole  200 A may penetrate through one or more of the cover plate layer  21 A, the touch layer  22 A, the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A. 
     The light through hole  200  may pass through the cover plate layer  21 A and the back plate layer  27 A, e.g., sequentially pass through the cover plate layer  21 A, the touch layer  22 A, a polarize sheet of the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, another polarize sheet of the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A described herein is illustrative only and is not limiting of the present invention. 
     The light through hole  200 A may penetrate through the touch layer  22 A and the back plate layer  27 A. For example, the light through hole  200 A sequentially penetrates through the touch layer  22 A, a polarize sheet of the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, another polarize sheet of the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light through hole  200 A may penetrate through the polarization layer  23 A and the back plate layer  27 A. For example, the light through hole  200 A sequentially penetrates through a polarize sheet of the polarization layer  23 A, the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, another polarize sheet of the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light through hole  200 A may penetrate through the encapsulation layer  24 A and the back plate layer  27 A. For example, the light through hole  200 A sequentially penetrates through the encapsulation layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light through hole  200 A may extend from the pixel layer  25 A to the back plate layer  27 A. For example, the light through hole  200 A sequentially penetrates through the pixel layer  25 A, the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light through hole  200 A may extend from the drive circuit layer  26 A to the back plate layer  27 A. For example, the light through hole  200 A sequentially penetrates through the drive circuit layer  26 A, the polarization layer  23 A, and the back plate layer  27 A from top to bottom. It will be understood by those skilled in the art that the configuration of the layers of the LCD screen  20 A at this moment is illustrative only and is not limiting of the present invention. 
     The light through hole  200 A may extend from the polarization layer  23 A located below the pixel layer  25 A to the back plate layer  27 A. For example, the light through hole  200 A sequentially penetrates through the polarization layer  23 A and the back plate layer  27 A below the pixel layer  25 A. 
     The light through hole  200 A may penetrate through the back plate layer  27 A. For example, the light through hole  200 A extends from a gap between the back plate layer  27 A and the polarization layer  23 A or a connecting medium to the back plate layer  27 A and penetrates through the back plate layer  27 A. 
     The light through hole  200 A is illustrated as penetrating through the pixel layer  25 A. The pixel layer  25 A includes the liquid crystal  252 A and the filter layer  251 A. The LCD screen  20 A includes a liquid crystal layer  28 A. The liquid crystal layer  28 A includes the liquid crystal  252 A, the filter layer  251 A, and the drive circuit layer  26 A. 
     The liquid crystal  252 A is held between the filter layer  251 A and the drive circuit layer  26 A. The light through hole  200  penetrates through the liquid crystal layer  28 A and the liquid crystal  252 A does not leak into the light through hole  200 . 
     The liquid crystal layer  28 A with the light through hole  200  may be first manufactured. Corresponding positions on the layers of the LCD screen  20 A are then perforated to form at least a part of the light through hole  200 . 
     The part of the light through hole  200  of the liquid crystal layer  28 A may be located in the height direction of the liquid crystal layer  28 A. The light through hole  200 A may also be obliquely formed on the liquid crystal layer  28 A along a certain oblique angle to adapt to the arrangement requirements of the light through hole  200 A. 
     Specifically, a sealing material  2811  is provided on the drive circuit layer  26 A or the filter layer  251 A of the liquid crystal layer  28 A, so that when the drive circuit layer  26 A and the filter layer  251 A are attached to each other, the sealing material  2811 A forms a sealing region  281 A, and the liquid crystal  252 A cannot enter the sealing region  281 A. In a subsequent step, the liquid crystal  252 A of the liquid crystal layer  28 A does not leak out as long as the liquid crystal layer  28 A is perforated within the sealing region  281 A. 
     The layers above the liquid crystal layer  28 A of the LCD screen  20 A may be perforated respectively to form the light through hole  200  facing the liquid crystal layer  28 A of the LCD screen  20 A from the side surface of the LCD screen  20 A. In this way, the LCD screen  20 A may be provided with the light through hole  200 A penetrating through the side surface of the LCD screen  20 A and the back surface of the LCD screen  20 A. 
     A part of the light guide assembly  50  is mounted between the LCD screen  20 A and the housing  40 , and a part of the light guide assembly  50  is mounted in the light through hole  200 A of the LCD screen  20 A. 
     The light guide assembly  50  may include at least one light guide conduit. There may be a plurality of light guide conduits to adapt to the light through holes  200 A of different shapes. The light through hole  200 A may be straight or curved. 
     When there are a plurality of light guide conduits, the light guide conduits may be mounted to the light through hole  200 A in a certain order one by one, or the light guide conduits may be mounted to the LCD screen  20 A in a certain order one by one. For example, when the liquid crystal layer  28 A is mounted to the polarization layer  23 A, one light guide conduit may be mounted to the portion of the light through hole  200  corresponding to the liquid crystal layer  28 A and the polarization layer  23 A. Then, when the back plate layer  27 A is mounted to the liquid crystal layer  28 A, another light guide conduit is mounted to the portion of the light through hole  200 A corresponding to the back plate layer  27 A. 
     The shape and position of the entire light through hole  200 A may be provided to the LCD screen  20 A according to the user&#39;s requirements. The shape and position of the light guide assembly  50  may be designed according to the desired requirements of the light guide channel  500 . 
     External light propagates along the light guide channel  500  to the camera module  30  located on one side of the back surface of the LCD screen  20 A. In this process, light may be reflected, diffused, or collimated in the light guide channel  500  of the light guide assembly  50 . 
     Further, the optical unit  31 A may be provided in the light guide channel  500  of the light guide assembly  50 . The optical unit  31 A may be integrally formed with the light guide assembly  50 , or the optical unit  31 A may also be provided in the light guide channel  500  of the light guide assembly  50 . 
     The light guide assembly  50  may be made of a transparent material, such as glass or resin. The light guide assembly  50  may also be non-transparent. For example, an outer wall of the light guide assembly  50  may be coated with an opaque material to reduce the influence of light outside the light guide assembly  50  on light in the light guide channel  500  of the light guide assembly  50 . 
     Referring to  FIGS. 26, 18A, and 10 , another implementation mode of the LCD screen  20 A according to the present invention is illustrated. 
     In the present example, the LCD screen  20 A has a light through hole  200  and a light guide channel  500 . The light through hole  200  penetrates through the display screen  20 A of the terminal device  1  from top to bottom. The light guide channel  500  extends downward from the gap between the display screen  20 A and the housing  40  of the terminal device  1  to the display screen  20 A. It will be understood that there may be a plurality of light through holes  200 , the light through holes  200  may penetrate through the display screen  20 A from top to bottom, and the light through holes  200  may also penetrate through the interior of the display screen  20 A from the side surface of the display screen  20 A to the bottom surface of the display screen  20 A. 
     Both of the light guide channel  500  and the light through hole  200  may be configured to conduct light. The light through hole  200  penetrates through the display screen  20 A, and the camera module  30  aligned with the light through hole  200  of the display screen  20 A can receive light from the outside of the display screen  20 A via the light through hole  200 . The camera module  30  aligned with the light guide channel  500  can receive light from the outside of the display screen  20 A via the light through hole  200 . 
     It is worth noting that the light guide channel  500  and the light through hole  200  may be independent from each other, and the light guide channel  500  and the light through hole  200  may be aligned with different camera modules  30  respectively. In other words, the plurality of camera modules  30  may be mounted to the display screen  20 A and located below the display screen  20 A. 
     In the present example, the light guide channel  500  and the light through hole  200  at least partially coincide with each other, so that light received by the light guide channel  500  and the light through hole  200  may enter the same camera module  30  and be received by the same photosensitive unit  32 A, so as to image. 
     Specifically, at least a part of the light guide channel  500  is located between the display screen  20 A and the housing  40 , and at least a part of the light guide channel  500  is located in the display screen  20 A. 
     The light guide channel  500  may include a first partial light guide channel  501 , a second partial light guide channel  502 , and a third partial light guide channel  503 . The first partial light guide channel  501  is located between the display screen  20 A and the housing  40 . The second partial light guide channel  502  and the third partial light guide channel  503  are located within the display screen  20 A respectively. 
     The light guide channel  500  is communicated with the light through hole  200 , and the third partial light guide channel  503  and the light through hole  200  coincide. 
     The first partial light guide channel  501  is located on one side surface of the display screen  20 A, the second partial light guide channel  502  extends inward from the side surface of the display screen  20 A, and the third partial light guide channel  503  extends downward from the interior of the display screen  20 A. 
     The terminal device  1  further includes an optical unit  31 A. The optical unit  31 A is provided to the light guide channel  500 . The optical unit  31 A may include a converging member  311 A, a modulating member  312 A, and a diffusing member  313 A. The converging member  311 A may be provided to the first partial light guide channel  501  for converging external light. The modulating member  312 A may be provided to the second partial light guide channel  502  for modulating light from the first partial light guide channel  501 . The diffusing member  313 A may be provided to the third partial light guide channel  503  for diffusing and transferring light to the camera module  30 . 
     It is worth noting that since the paths of light entering the camera module  30  for imaging through the light guide channel  500  and the light through hole  200  are different, light of different paths has an optical path difference when reaching the camera module  30 . Beams simultaneously reaching a photosensitive chip of the camera module  30  have different phases and may eventually present different images. In order to avoid this problem, the optical path formed by the optical unit  31 A in the display screen  20  is designed such that light reaching the camera module  30  may present consistent images. 
     In other embodiments of the present invention, the camera module  30  includes an optical mechanism  31 A′ and a photosensitive unit  32 A. The optical mechanism  31 A′ is aligned with the light through hole  200  and the light guide channel  500 , and the optical mechanism  31 A′ is held in a photosensitive path of the photosensitive unit  32 A. At least parts of the light through hole  200  and the light guide channel  500  are shared by each other. 
     In the present example, the camera module  30  includes the optical unit  31 A and a photosensitive unit  32 A. The optical unit  31 A is provided to the light guide channel  500  and the photosensitive unit  32 A is mounted on a back side of the display screen  20 A. 
     In the case where the light guide channel  500  and the light through hole  200  coexist, since the camera module  30  receives light via the light guide channel  500 , the light through hole  200  may be designed to be smaller. 
     The light guide channel  500  may not be observed from the outside of the display screen  20 A. For example, when the second partial light guide channel  502  is located at the encapsulation layer  24 A of the display screen  20 A, the light guide channel  500  may not be observed outside the display screen  20 A due to the polarization layer located above the encapsulation layer  24 A. Therefore, the inner diameter of at least a part of the light guide channel  500  may be designed to be slightly larger than the inner diameter of the light through hole  200 , so that a part of the optical element may be placed in the light guide channel  500 . 
     When the light through hole  200  is small-sized, it is more difficult to observe the light through hole  200  from the outside of the display screen  20 A, so as to facilitate increase of a screen-to-body ratio of the display screen  20 A. 
     Further, for the light through hole  200 , the inner diameter of the light through hole  200  may be set to be gradually increased from top to bottom. A part of the optical element of the optical unit  31 A may be provided to the light through hole  200 , e.g., the diffusing member  313 A. 
     For example, when a light through region provided by the light through hole  200  is smaller than a light receiving region of the photosensitive unit  32 A of the camera module  30 , one of the diffusing members  313 A may be provided to the light through hole  200 . The diffusing member  313 A may diffuse light in the light through hole  200  so that the light through region provided by the light through hole  200  matches the light receiving region of the photosensitive unit  32 A. 
     Referring to  FIGS. 27 and 18A , another implementation mode of the LCD screen  20 A according to the present invention is illustrated. 
     In the present example, the LCD screen  20 A has a light through hole  200 . The light through hole  200  penetrates through the LCD screen  20 A in the height direction. At least a part of the light guide assembly  50  is provided in the light through hole  200 . 
     The light guide assembly  50  provides a light guide channel  500 . The desired light guide channel  500  may be obtained by designing the shape and structure of the light guide assembly  50 . 
     The light guide assembly  50  includes two light guide conduits. One of the light guide conduits is accommodated in the light through hole  200 , and the other light guide conduit extends from the gap between the display screen  20 A and the housing  40  to the position of the light through hole  200 . That is, one of the light guide conduits can guide light above the display screen  20 A to pass through the display screen  20 A from top to bottom and then to reach the camera module  30 . The other light guide conduit can guide light between the display screen  20 A and the housing  40  to reach the camera module  30 . The way in which the light through hole  200  is made may be described with reference to the foregoing description. 
     The light guide conduit may be cylindrical, triangular prism-shaped, or quadrangular prism-shaped. The inner diameters corresponding to all positions of the light guide conduit may be different. 
     The light guide conduit may be made of a light-transmitting material, so that the light guide conduit is difficult to observe from the outside of the display screen  20 A. Meanwhile, in order to reduce the influence of stray light, e.g., the influence of light from the pixel layer  25 A of the display screen  20 A, the light guide conduit may be coated with a light-shielding material. 
     Further, the LCD screen  20 A includes an optical unit  31 A. The optical unit  31 A is held in the light guide channel  500  of the light guide assembly  50 . The optical unit  31 A may be a filtering member, a diffusing member  313 A, or a modulating member  312 A. The optical unit  31 A may pre-process light to achieve desired light entering the camera module  30 . 
     It is worth noting that since the paths of light entering the camera module  30  for imaging through the different light guide channels  500  are different, light of different paths has an optical path difference when reaching the camera module  30 . Beams simultaneously reaching a photosensitive chip of the camera module  30  have different phases and may eventually present different images. In order to avoid this problem, the optical path formed by the optical unit  31 A in the display screen  20  is designed such that light reaching the camera module  30  may present consistent images. 
     In order to further reduce the overall height size of the terminal device  1 , a camera module  30  having a low height size is adopted preferably in the present invention. 
       FIG. 28  illustrates a specific example of the camera module  30  according to the present invention. The camera module  30  includes an optical mechanism  31 A′ and a photosensitive unit  32 A. The camera module  30  may further include a diaphragm  33 A. The diaphragm  33 A is located at the position of the light through hole  200 . The optical mechanism  31 A′ is held in a photosensitive path of the photosensitive unit  32 A. 
     The diaphragm  33 A may serve to constrain light passing through the optical mechanism  31 A′. Specifically, it is possible to control the light entering amount of the optical mechanism  31 A′ by controlling the size of a light through aperture of the diaphragm  33 A. 
     The diaphragm  33 A may be circular, triangular, or rectangular. The diaphragm  33 A is sized to limit light entering the optical mechanism  31 A′ by the diaphragm  33 A. 
     In the present example, the display screen  20  is provided with the light through hole  200 , and the camera module  30  is mounted below the display screen  20 . The light through hole  200  allows light to penetrate through the display screen  20  and then to reach the camera module  30 . 
     The light through hole  200  can function as the diaphragm  33 A of the camera module  30 , so that for the camera module  30 , the camera module  30  does not need to be separately provided with the diaphragm  33 A. The amount of light entering the camera module  30  may be controlled by the size control over the light through hole  200  of the display screen  20 . The light through hole  200  acts as the diaphragm  33 A. 
     In this way, the height size of the camera module  30  can be reduced, so that the height sizes of the display screen  20  and the camera module  30  can also be reduced, thereby facilitating thinning of the terminal device  1 . 
     Furthermore, before the camera module  30  is mounted to the display screen  20 , the optical path design of the camera module  30  is fixed, and parameters such as the light entering amount and the exposure time required by the camera module  30  may be determined. Based on these parameters, the size of the diaphragm  33 A may be determined. Therefore, in the process of manufacturing and forming the light through hole  200  in the display screen  20 , the light through hole  200  meeting the requirements may be obtained by manufacturing according to the requirements of the camera module  30 . Reference may be made to the above manufacturing method of the light through hole  200 , and the aperture size and position of the light through hole  200  may be designed as required. 
     Furthermore, the distance between the camera module  30  and the diaphragm  33 A in the photosensitive path of the photosensitive unit  32 A is determined based on the optical path design according to the optical requirements of the camera module  30 . When the camera module  30  is assembled on the display screen  20 , the distance between the camera module  30  and the diaphragm  33 A may be adjusted as required by adjusting relative positions of the camera module  30  and the display screen  20  so as to meet the optical path requirements of the camera module  30 . 
       FIG. 29  illustrates a specific embodiment mode of the camera module  30  according to the present invention. 
     The camera module  30  includes an optical mechanism  31 A′, a photosensitive unit  32 A, and a diaphragm  33 A′. The diaphragm  33 A′ is provided to the optical mechanism  31 A′. The optical mechanism  31 A′ is held in a photosensitive path of the photosensitive unit  32 A. The light through amount of the optical mechanism  31 A′ may be controlled by controlling the size of the diaphragm  33 A′. 
     When the camera module  30  is mounted to the display screen  20 , the light through hole  200  of the display screen  20  allows light to pass through the light through hole  200  from the outside of the display screen  20  and then to reach the camera module  30 . The light through hole  200  can influence an imaging result of the camera module  30 . 
     The light through hole  200  acts like a diaphragm, and by controlling the aperture of the light through hole  200 , an imaging beam may be controlled. The light through hole  200  of the display screen  20  may serve to constrain the imaging beam of the camera module  30 . The diaphragm  33 A′ of the camera module  30  also serves to constrain the imaging beam. The light through hole  200  of the display screen  20  and the diaphragm  33 A′ of the camera module  30  may operate in cooperation. 
     Before the camera module  30  is mounted to the display screen  20 , the optical path design of the camera module  30  may be roughly determined so that the size of the light through hole  200  of the display screen  20  may be set based on the requirements of the camera module  30 . After the camera module  30  is mounted to the display screen  20 , the size of the light through hole  200  is fixed. The relative positions between the camera module  30  and the light through hole  200  may be fixed. The imaging beam may be further controlled by controlling the diaphragm  33 A′ of the camera module  30 . 
     Further, the light through hole  200  of the display screen  20  may serve to constrain the imaging beam. The diaphragm  33 A′ of the camera module  30  may also serve to constrain the imaging beam, or may also be provided as a diaphragm capable of eliminating stray light. The stray light is removed from a beam after passing through the light through hole  200 . In other words, the light through hole  200  of the display screen  20  and the diaphragm  33 A′ of the camera module  30  may cooperate with each other to limit the imaging beam. The light through hole  200  of the display screen  20  and the diaphragm  33 A′ of the camera module  30  may also serve different functions, and is specifically set according to the light path requirements of the camera module  30 . 
     It is worth noting that the diaphragm  33 A′ of the camera module  30  may be a variable diaphragm, and the aperture of the diaphragm  33 A′ may be adjusted, so that the light through amount of the camera module  30  is controlled by adjusting the aperture thereof. 
       FIG. 30  illustrates a specific example of the camera module  30  according to the present invention. As shown in  FIG. 30 , in this specific implementation mode, the camera module  30  includes a circuit board  31 , a photosensitive chip  32 , and a light transmitting assembly  33 . The circuit board  31  has a groove  310 . The photosensitive chip  32  is provided in the groove  310  and electrically connected to the circuit board  31 . The light transmitting assembly  33  is located in a photosensitive path of the photosensitive chip  32 . Thus, imaging light transmitted through the display screen  20  reaches the light transmitting assembly  33  and then reaches the photosensitive chip  32  to be sensed by the photosensitive chip  32  for performing an imaging reaction. 
     Those skilled in the art would know that in a conventional camera module based on a COB process, a circuit board has a flat surface, and a photosensitive chip is directly attached and electrically connected to the flat surface of the circuit board. Since each camera module has a preset optical back focus requirement, a mounting reference height of the photosensitive chip directly determines an overall height size of the camera module  30 . 
     Accordingly, in this specific example, the circuit board  31  is provided with the groove  310  so as to reduce the mounting reference height of the photosensitive chip  32  by the groove  310 , as compared with the conventional camera module based on the COB process. In other words, in the present invention, a top surface of the circuit board  31  is a non-flat surface. A region for mounting the photosensitive chip  32  in the circuit board  31  is recessed downward so that the mounting reference height of the photosensitive chip  32  is reduced. It will be understood that the mounting height of an optical lens  332  relative to the circuit board  31  can be reduced if the optical back focus requirements remain unchanged, so that the overall height size of the camera module  30  can be reduced. 
     Preferably, in this specific example, the size of the groove  310  corresponds to the size of the photosensitive chip  32  so that the groove  310  may be used to position and limit the photosensitive chip  32 . Specifically, during mounting of the photosensitive chip  32  in the groove  310 , the photosensitive chip  32  may be snugly inserted directly into the groove  310 . There is no need to continuously calibrate and position the photosensitive chip at a mounting position of the circuit board in the conventional camera module based on the COB process. Further, after the photosensitive chip  32  is mounted in the groove  310  and electrically connected to the circuit board  31 , the photosensitive chip  32  is “defined” in the groove  310  so as to prevent the photosensitive chip  32  from being detached or deviating from the groove  310 . 
     Further, the camera module  30  further includes a group of leads  34 . An electrical connection between the photosensitive chip  32  and the circuit board  31  is achieved by the leads  34  after the photosensitive chip  32  is attached in the groove  310  of the circuit board  31 . Since the distance between an upper surface of the photosensitive chip  32  and an upper surface of the circuit board  31  is reduced, an arc height of a gold wire between pads connecting the photosensitive chip  32  and the circuit board  31  is also reduced, and the difficulty of wire bonding is reduced. 
     Specifically, each of the leads  34  extends in a curved manner between the photosensitive chip  32  and the circuit board  31  to connect the photosensitive chip  32  to the circuit board  31  by the leads  34 , so that the circuit board  31  may supply power to the photosensitive chip  32  according to the leads  34 , and the photosensitive chip  32  may transmit collected signals according to the leads  34 . 
     It is worth mentioning that the type of the leads  34  in this specific example is not limited by the present application. For example, the leads  34  may be gold wires, silver wires, or copper wires. Also, the leads  34  may be mounted between the circuit board  31  and the photosensitive chip  32  by means of a “gold wire bonding” process for achieving an electrical connection therebetween. 
     Specifically, the “gold wire bonding” process is generally divided into two types: a “forward gold wire bonding” process and a “reverse gold wire bonding” process. The “forward gold wire bonding” process refers to: in the process of laying the lead  34 , first forming one end of the lead  34  on a conductive end of the circuit board  31 , then extending the lead  34  in a curved manner, and finally forming the other end of the lead  34  on a conductive end of the photosensitive chip  32 . In this way, the lead  34  is formed between the photosensitive chip  32  and the circuit board  31 . The “reverse gold wire bonding” process refers to: in the process of laying the lead  34 , first forming one end of the lead  34  on the conductive end of the photosensitive chip  32 , then extending the lead  34  in a curved manner, and finally forming the other end of the lead  34  on the conductive end of the circuit board  31 . In this way, the lead  34  is formed between the photosensitive chip  32  and the circuit board  31 . It is worth mentioning that an upward protrusion height of the lead  34  formed by the “reverse gold wire bonding” process is smaller than that of the lead  34  formed by the “forward gold wire bonding” process. Therefore, preferably, in this specific implementation, the lead  34  is formed by using the “reverse gold wire bonding” process. 
     Further, the camera module  30  further includes a base  35 . The base  35  is provided to the circuit board  31  for supporting the light transmitting assembly  33 . The light transmitting assembly  33  includes a color filter element  331  and an optical lens  332 . The color filter element  331  and the optical lens  332  are sequentially provided in the photosensitive path of the photosensitive chip  32 . It is worth noting that when the arc height of the lead  34  is reduced, an inner cavity height of the base  35  may also be appropriately reduced, and the height of the base  35  may also be further reduced. Further, the overall height of the camera module  30  may also be appropriately reduced. 
     Specifically, in this specific example, the base  35  may be implemented as a conventional plastic bracket, which is preformed and attached to the top surface of the circuit board  31 ; or, the base  35  may be implemented as a molded base, which may be integrally formed at a corresponding position of the circuit board  31  and/or the photosensitive chip  32  by means of molding on board (MOB) and molding on chip (MOC) processes. Those skilled in the art would know that the MOB process refers to: integrally forming the molded base on the circuit board  31  by a molding process. The formed molded base integrally embeds the circuit board  31 , electronic components  312  located on the circuit board  31 , and the leads  34 . The MOC process refers to: integrally forming the molded base on the circuit board  31  by a molding process. The formed molded base embeds the circuit board  31  and electronic components  312  located on the circuit board  31  as well as at least a part of the leads  34 , or embeds the leads  34  and at least a part of the photosensitive chip  32  (wherein at least one region of the photosensitive chip  32  is a non-photosensitive region of the photosensitive chip  32 ). 
     In this specific example, the color filter element  331  is provided between the optical lens  332  and the photosensitive element so that light entering the camera module  30  from the optical lens  332  is filtered by the color filter element  331  and can be received and subjected to photoelectric conversion by the photosensitive chip  32  to improve the imaging quality of the camera module  30 . For example, the color filter element  331  may be configured to filter an infrared part of light entering the camera module  30  from the optical lens  332 . 
     Those skilled in the art would know that the color filter element  331  can be implemented as a variety of types, including, but not limited to, infrared cutoff filters, full-transmission spectral filters, and other filters or combinations of a plurality of filters. Specifically, for example, the color filter element  331  is implemented as a combination of an infrared cutoff filter and a full-transmission spectral filter. That is, the infrared cutoff filter and the full-transmission spectrum filter can be switched to be selectively located in the photosensitive path of the photosensitive chip  32 . Thus, when the camera module  30  is used in a light-sufficient environment such as daytime, the infrared cutoff filter may be switched to the photosensitive path of the photosensitive chip  32  to filter infrared rays in light reflected by an object entering the camera module  30  by the infrared cutoff filter, and when the camera module  30  is used in a dark environment such as night, the full-transmission spectral filter may be switched to the photosensitive path of the photosensitive chip  32  to allow partial light transmission of infrared rays in light reflected by an object entering the camera module  30 . 
     It is worth mentioning that the color filter element  331  may also be provided at other positions in the photosensitive path of the photosensitive chip  32 . For example, the color filter element  331  is provided at the bottom portion of the optical lens  332 , the bottom side of the optical lens  332 , etc. which is not limited by the present application. 
     In addition, it is also worth mentioning that in this specific example, the camera module  30  may be implemented as a fixed focus module or a dynamic focus module. When the camera module  30  is a dynamic focus module, the camera module  30  further includes a driver  36  connected to the circuit board  31 . The driver  36  is configured to controllably drive the lens to move so as to realize auto-focus. 
       FIG. 31  illustrates another specific example of the camera module  30  according to the present invention. The camera module  30  illustrated in  FIG. 31  is a modified implementation mode of the camera module  30  illustrated in  FIG. 30 . 
     Specifically, as shown in  FIG. 31 , in this specific example, the camera module  30  includes a circuit board  31 , a photosensitive chip  32 , a light transmitting assembly  33 , and a reinforcing plate  37 . The circuit board  31  has an opening  310 A penetratingly formed in the circuit board  31 . The reinforcing plate  37  is attached to a bottom surface of the circuit board  31 . The photosensitive chip  32  is provided at the opening  310 A of the circuit board  31  and attached to the reinforcing plate  37 . The photosensitive chip  32  may be conductively connected to the circuit board  31 . The light transmitting assembly  33  is provided in a photosensitive path of the photosensitive chip  32 . Thus, imaging light transmitted through the display screen  20  reaches the light transmitting assembly  33  and then reaches the photosensitive chip  32  to be sensed by the photosensitive chip  32  for performing an imaging reaction. 
     The reinforcing plate  37  may be implemented as a steel plate, which has a more flat surface than the circuit board  31 . When the photosensitive chip  32  is attached thereto, the plate is more flat and has a better imaging effect. In addition, the thermal conductivity of metal is better, and the steel plate may be used for heat dissipation. 
     In other words, in this specific example, the circuit board  31  has the opening  310 A that is penetratingly formed in the circuit board  31  to reduce the mounting reference height of the photosensitive chip  32  by the opening  310 A, as compared with the camera module  30  illustrated in  FIG. 30 . In other words, in the present invention, a top surface of the circuit board  31  is a non-flat surface. A region for mounting the photosensitive chip  32  in the circuit board  31  is recessed downward and penetrates through the circuit board  31  so that the mounting reference height of the photosensitive chip  32  is further reduced. It will be understood that each camera module has a preset optical back focus requirement, so that the mounting height of an optical lens  332  relative to the circuit board  31  can be further reduced if the optical back focus requirements remain unchanged, and the overall height size of the camera module  30  can be further reduced. 
     As shown in  FIG. 31 , it should be particularly noted that in this specific example, a bottom surface of the photosensitive chip  32  is flush with the bottom surface of the circuit board  31 . That is, the mounting reference height of the photosensitive chip  32  is the height of the bottom surface of the circuit board  31 , so that the mounting position of the photosensitive chip  32  can be further reduced on the premise of ensuring a preset optical back focus, and the overall height size of the camera module  30  can be further reduced. 
     Preferably, in this specific example, the size of the opening  310 A corresponds to the size of the photosensitive chip  32  so that the opening  310 A may be used to position and limit the photosensitive chip  32 . Specifically, during mounting of the photosensitive chip  32  in the opening  310 A, the photosensitive chip  32  may be snugly inserted directly into the opening  310 A and finally attached to the reinforcing plate  37 . There is no need to continuously calibrate and position the photosensitive chip  32  at a mounting position of the circuit board  31  in the conventional camera module based on the COB process. Further, after the photosensitive chip  32  is mounted in the opening  310 A and electrically connected to the circuit board  31 , the photosensitive chip  32  is “defined” in the opening  310 A so as to prevent the photosensitive chip  32  from being detached or deviating from the opening  310 A. 
     Further, the camera module  30  further includes a group of leads  34 . An electrical connection between the photosensitive chip  32  and the circuit board  31  is achieved by the leads  34  after the photosensitive chip  32  is mounted in the opening  310 A of the circuit board  31 . Specifically, each of the leads  34  extends in a curved manner between the photosensitive chip  32  and the circuit board  31  to connect the photosensitive chip  32  to the circuit board  31  by the leads  34 , so that the circuit board  31  may supply power to the photosensitive chip  32  according to the leads  34 , and the photosensitive chip  32  may transmit collected signals according to the leads  34 . 
     It is worth mentioning that the type of the leads  34  in this specific example is not limited by the present application. For example, the leads  34  may be gold wires, silver wires, or copper wires. Also, the leads  34  may be mounted between the circuit board  31  and the photosensitive chip  32  by means of a “gold wire bonding” process for achieving an electrical connection therebetween. 
     Specifically, the “gold wire bonding” process is generally divided into two types: a “forward gold wire bonding” process and a “reverse gold wire bonding” process. The “forward gold wire bonding” process refers to: in the process of laying the lead  34 , first forming one end of the lead  34  on a conductive end of the circuit board  31 , then extending the lead  34  in a curved manner, and finally forming the other end of the lead  34  on a conductive end of the photosensitive chip  32 . In this way, the lead  34  is formed between the photosensitive chip  32  and the circuit board  31 . The “reverse gold wire bonding” process refers to: in the process of laying the lead  34 , first forming one end of the lead  34  on the conductive end of the photosensitive chip  32 , then extending the lead  34  in a curved manner, and finally forming the other end of the lead  34  on the conductive end of the circuit board  31 . In this way, the lead  34  is formed between the photosensitive chip  32  and the circuit board  31 . It is worth mentioning that an upward protrusion height of the lead  34  formed by the “reverse gold wire bonding” process is smaller than that of the lead  34  formed by the “forward gold wire bonding” process. Therefore, preferably, in this specific implementation, the lead  34  is formed by using the “reverse gold wire bonding” process. 
     Further, the camera module  30  further includes a base  35 . The base  35  is provided to the circuit board  31  for supporting the light transmitting assembly  33 . The light transmitting assembly  33  includes a color filter element  331  and an optical lens  332 . The color filter element  331  and the optical lens  332  are sequentially provided in the photosensitive path of the photosensitive chip  32 . 
     Specifically, in this specific example, the base  35  may be implemented as a conventional plastic bracket, which is preformed and attached to the top surface of the circuit board  31 ; or, the base  35  may be implemented as a molded base, which may be integrally formed at a corresponding position of the circuit board  31  and/or the photosensitive chip  32  by means of MOB and MOC processes. Those skilled in the art would know that the MOB process refers to: integrally forming the molded base on the circuit board  31  by a molding process. The formed molded base integrally embeds the circuit board  31 , electronic components  312  located on the circuit board  31 , and the leads  34 . The MOC process refers to: integrally forming the molded base on the circuit board  31  by a molding process. The formed molded base embeds the circuit board  31  and electronic components  312  located on the circuit board  31  as well as at least a part of the leads  34 , or embeds the leads  34  and at least a part of the photosensitive chip  32  (wherein at least one region of the photosensitive chip  32  is a non-photosensitive region of the photosensitive chip  32 ). 
     In this specific example, the color filter element  331  is provided between the optical lens  332  and the photosensitive element so that light entering the camera module  30  from the optical lens  332  is filtered by the color filter element  331  and can be received and subjected to photoelectric conversion by the photosensitive chip  32  to improve the imaging quality of the camera module  30 . For example, the color filter element  331  may be configured to filter an infrared part of light entering the camera module  30  from the optical lens  332 . 
     Those skilled in the art would know that the color filter element  331  can be implemented as a variety of types, including, but not limited to, infrared cutoff filters, full-transmission spectral filters, and other filters or combinations of a plurality of filters. Specifically, for example, the color filter element  331  is implemented as a combination of an infrared cutoff filter and a full-transmission spectral filter. That is, the infrared cutoff filter and the full-transmission spectrum filter can be switched to be selectively located in the photosensitive path of the photosensitive chip  32 . Thus, when the camera module  30  is used in a light-sufficient environment such as daytime, the infrared cutoff filter may be switched to the photosensitive path of the photosensitive chip  32  to filter infrared rays in light reflected by an object entering the camera module  30  by the infrared cutoff filter, and when the camera module  30  is used in a dark environment such as night, the full-transmission spectral filter may be switched to the photosensitive path of the photosensitive chip  32  to allow partial light transmission of infrared rays in light reflected by an object entering the camera module  30 . 
     It is worth mentioning that the color filter element  331  may also be provided at other positions in the photosensitive path of the photosensitive chip  32 . For example, the color filter element  331  is provided at the bottom part of the optical lens  332 , the bottom side of the optical lens  332 , etc. which is not limited by the present application. 
     It is also worth mentioning that in this specific example, the camera module  30  may be implemented as a fixed focus camera module or a dynamic focus camera module. When the camera module  30  is a dynamic focus camera module, the camera module  30  further includes a driver  36  electrically connected to the circuit board  31 . The driver  36  is configured to controllably drive the lens to move so as to realize auto-focus. 
       FIG. 32  is yet another specific illustration of the camera module  30  according to the present invention. The camera module  30  illustrated in  FIG. 32  is a modified implementation mode of the camera module  31  illustrated in  FIG. 30 . 
     Specifically, in this specific example, the base  35  is directly mounted to the reinforcing plate  37 , as compared with the camera module  30  illustrated in  FIG. 31 . In other words, in this specific example, the mounting reference height of the base  35  is reduced, so that the mounting reference height of the optical lens  332  mounted to the base  35  is reduced, and the overall height size of the camera module  30  is reduced. 
     Accordingly, in this specific embodiment, the base  35  may be implemented as a conventional plastic bracket, which is preformed and attached to a top surface of the reinforcing plate  37 ; or, the base  35  may be implemented as a molded base, which may be integrally formed at a corresponding position of the reinforcing plate  37 , the circuit board  31 , and/or the photosensitive chip  32  by means of MOB and MOC processes. Those skilled in the art would know that the MOB process refers to: integrally forming the molded base on the circuit board  31  by a molding process. The formed molded base integrally embeds the reinforcing plate  37 , the circuit board  31 , electronic components  312  located on the circuit board  31 , and the leads  34 . The MOC process refers to: integrally forming the molded base on the circuit board  31  by a molding process. The formed molded base embeds the reinforcing plate  37 , the circuit board  31 , and electronic components  312  located on the circuit board  31  as well as at least a part of the leads  34 , or embeds the leads  34  and at least a part of the photosensitive chip  32  (wherein at least one region of the photosensitive chip  32  is a non-photosensitive region of the photosensitive chip  32 ). 
       FIG. 33  illustrates yet another specific example of the camera module  30  according to the present invention. The camera module  30  illustrated in  FIG. 33  is another modified implementation mode of the camera module  31  illustrated in  FIG. 30 . 
     Specifically, in this specific example, the base  35  has at least two positioning columns  351  extending downward, as compared with the camera module  30  illustrated in  FIG. 31 . The circuit board  31  has at least two openings  311 . The positioning columns  351  are provided to the reinforcing plate  37  by penetrating through the openings  311  in such a manner that the mounting reference height of the base  35  can be reduced and the overall height of the camera module  30  can be reduced. 
       FIGS. 34 and 35  illustrate yet another specific example of the camera module  30  according to the present invention. The camera module  30  illustrated in  FIGS. 34 and 35  is yet another modified implementation mode of the camera module  31  illustrated in  FIG. 30 . 
     As shown in  FIGS. 34 and 35 , in this specific example, the reinforcing plate  37  has a boss  371 A or a groove  371  at the opening  310 A of the circuit board  31  to adjust the mounting reference height of the photosensitive chip  32  by the boss  371 A or the groove  371 . In other words, in this specific example, the bottom surface of the photosensitive chip  32  is not flush with the bottom surface of the circuit board  31 . 
     Specifically, as shown in  FIG. 34 , when the reinforcing plate  37  has a groove  371  at the opening  310 A of the circuit board  31 , the mounting reference height of the photosensitive chip  32  is further reduced, so that the overall height size of the camera module  30  is further reduced when meeting the design requirements of a preset optical back focus. It should be noted that when the reinforcing plate  37  has a groove  371  at the opening  310 A of the circuit board  31 , the photosensitive chip  32  is attached to the reinforcing plate  37 , at which time the bottom surface of the photosensitive chip  32  is lower than the bottom surface of the circuit board  31 . 
     Specifically, as shown in  FIG. 35 , when the reinforcing plate  37  has a boss  371 A at the opening  310 A of the circuit board  31 , the mounting reference height of the photosensitive chip  32  is reduced as compared with the conventional camera module based on the COB process, so that the overall height size of the camera module  30  is reduced when meeting the design requirements of a preset optical back focus. It should be noted that when the reinforcing plate  37  has a boss  371 A at the opening  310 A of the circuit board  31 , the photosensitive chip  32  is attached to the reinforcing plate  37 , at which time the bottom surface of the photosensitive chip  32  is higher than the bottom surface of the circuit board  31  but lower than the top surface of the circuit board  31 . 
       FIG. 36  illustrates yet another specific example of the camera module  30  according to the present invention. The camera module  30  illustrated in  FIG. 36  is a modified implementation mode of the camera module  33  illustrated in  FIG. 30 . 
     Specifically, as shown in  FIG. 36 , in this specific example, the camera module  30  includes a circuit board  31 , a photosensitive chip  32 , a base  35 , an optical lens  332 , a color filter element  331 , and a reinforcing plate  37 . The circuit board  31  has an opening  310 A penetratingly formed in the circuit board  31 . The reinforcing plate  37  is attached to a bottom surface of the circuit board  31 . The photosensitive chip  32  is provided at the opening  310 A of the circuit board  31  and attached to the reinforcing plate  37 . The photosensitive chip  32  may be conductively connected to the circuit board  31 . The color filter element  331  and the optical lens  332  are sequentially provided in a photosensitive path of the photosensitive chip  32 . Thus, imaging light transmitted through the display screen  20  reaches the optical lens  332 , and is filtered by the color filter element  331 , and then reaches the photosensitive chip  32  to be sensed by the photosensitive chip  32  for performing an imaging reaction. 
     In particular, in this specific implementation mode, the optical lens  332  and the base  35  have an integrated structure. That is, the optical lens  332  and the base  35  have been integrated before participating in the assembly of the camera module  30 . In other words, in this specific example, the optical lens  332  is an integrated lens  333  that is assembled with the base  35  to form an element unit. Further, in this specific example, the base  35  has at least two positioning columns extending downward. The circuit board  31  has at least two openings. The positioning columns are provided to the reinforcing plate  37  by penetrating through the openings in such a manner that the integrated lens  333  and the photosensitive chip  32  have the same mounting reference plane (i.e., the top surface of the reinforcing plate  37 ). Thus, the overall height size of the camera module  30  is reduced to meet the design requirements of a preset optical back focus. 
     It is worth mentioning that in this specific example of the application, the integrated lens  333  may further include the color filter unit  331 . That is, in this specific implementation mode, the optical lens  332 , the base  35 , and the color filter unit  331  have an integrated structure. That is, the optical lens  332 , the base  35 , and the color filter unit  331  have been integrated before participating in the assembly of the camera module  30 . Thus, it is possible to make the assembly of the camera module  30  more compact, so that the overall height size of the camera module  30  is reduced. 
       FIG. 37  illustrates yet another specific example of the camera module  30  according to the present invention. As shown in  FIG. 37 , in this specific example, the camera module  30  includes an optical lens  332 , a base  35 , a color filter element  331 , a photosensitive chip  32 , and a circuit board  31 . The photosensitive chip  32  is conductively provided to the circuit board  31 . The base  35  is provided to the circuit board  31 . The lens and the color filter element  331  are sequentially provided in a photosensitive path of the photosensitive chip  32 . The base  35  is configured to support the color filter element  331 . Thus, imaging light transmitted through the display screen  20  reaches the optical lens  332 , and is filtered by the color filter element  331 , and then reaches the photosensitive chip  32  to be sensed by the photosensitive chip  32  for performing an imaging reaction. 
     Further, the camera module  30  further includes a group of leads  34 . An electrical connection between the photosensitive chip  32  and the circuit board  31  is achieved by the leads  34  after the photosensitive chip  32  is attached in the circuit board. Specifically, each of the leads  34  extends in a curved manner between the photosensitive chip  32  and the circuit board  31  to connect the photosensitive chip  32  to the circuit board  31  by the leads  34 , so that the circuit board  31  may supply power to the photosensitive chip  32  according to the leads  34 , and the photosensitive chip  32  may transmit collected signals according to the leads  34 . 
     It is worth mentioning that the type of the leads  34  in this specific example is not limited by the present application. For example, the leads  34  may be gold wires, silver wires, or copper wires. Also, the leads  34  may be mounted between the circuit board  31  and the photosensitive chip  32  by means of a “gold wire bonding” process for achieving an electrical connection therebetween. 
     Specifically, the “gold wire bonding” process is generally divided into two types: a “forward gold wire bonding” process and a “reverse gold wire bonding” process. The “forward gold wire bonding” process refers to: in the process of laying the lead  34 , first forming one end of the lead  34  on a conductive end of the circuit board  31 , then extending the lead  34  in a curved manner, and finally forming the other end of the lead  34  on a conductive end of the photosensitive chip  32 . In this way, the lead  34  is formed between the photosensitive chip  32  and the circuit board  31 . The “reverse gold wire bonding” process refers to: in the process of laying the lead  34 , first forming one end of the lead  34  on the conductive end of the photosensitive chip  32 , then extending the lead  34  in a curved manner, and finally forming the other end of the lead  34  on the conductive end of the circuit board  31 . In this way, the lead  34  is formed between the photosensitive chip  32  and the circuit board  31 . It is worth mentioning that an upward protrusion height of the lead  34  formed by the “reverse gold wire bonding” process is smaller than that of the lead  34  formed by the “forward gold wire bonding” process. Therefore, preferably, in this specific implementation, the lead  34  is formed by using the “reverse gold wire bonding” process. 
     A group of electronic components  312  is further provided on the circuit board  31 . Each of the electronic components  312  may be attached to an edge region of the circuit board  31  at intervals (as compared with an attachment position of the photosensitive chip  32 ) by a process such as a surface mount technology (SMT). The electronic components  312  include, but are not limited to, resistors, capacitors, inductors, etc. It is worth mentioning that the photosensitive chip  32  and each of the electronic components  312  may be located on the same side or opposite sides of the circuit board  31 , respectively. For example, the photosensitive chip  32  and each of the electronic components  312  may be located on the same side of the circuit board  31 , respectively, and each of the electronic components  312  may be attached to an edge region of the circuit board  31  at intervals. 
     In particular, as shown in  FIG. 37 , in this specific example, the base  35  is supported on the top surface of the circuit board  31 , and the base  35  includes a body  352  and a side wall  353  extending downward along the body  352 . The body  352  and the side wall  353  define an accommodation cavity  354 . When the base  35  is provided to the circuit board  31 , the side wall  353  is supported on the circuit board  31 , the bottom surface of the base  35 , the upper surface of the circuit board  31 , and the side wall  353  together define the accommodation cavity  354 . The electronic components  312  provided to the circuit board  31  are accommodated in the accommodation cavity  354 . Preferably, the height size of the accommodation cavity  354  is less than 0.2 mm, such as 0.1 mm. 
     Further, as shown in  FIG. 37 , in this specific example, the base  35  also has at least one accommodation hole  355 . The accommodation hole  355  penetrates through the base  35  to be communicated with the accommodation cavity  354  and an external environment. It will be understood that in this specific embodiment, the height of the accommodation cavity  354  is lower than that of a high-sized electronic component  312 , such as a capacitor. Therefore, when the base  35  is provided to the circuit board  31 , the height from the bottom surface of the body  352  of the base  35  to the top surface of the circuit board  31  is less than a high-sized electronic component  312  such as a capacitor. If the accommodation hole  355  is not provided, the electronic component  312  cannot be accommodated. That is, the accommodation hole  355  serves to avoid the high-sized electronic component  312  so that the electronic component  312  may be accommodated in the base  35  with the height of the base  35  reduced. In other words, by providing the accommodation hole  355  in the base  35 , the overall design height of the base  35  can be reduced so that the overall height size of the camera module  30  is reduced. 
     By way of example and not limitation, for example, the height of the capacitor in the electronic component  312  is 0.38 mm, the height of the accommodation cavity  354  is 0.1 mm, and the thickness of the body  352  of the base  35  is set to 0.4 mm, that is, the height of the accommodation hole  355  is 0.4 mm. Thus, when the base  35  is provided to the circuit board  31 , the capacitor in the electronic component  312  cannot be completely accommodated in the accommodation cavity  354 . Accordingly, an upper end of the capacitor in the electronic component  312  extends into the accommodation hole  355  and is accommodated in the accommodation hole  355 . It will be understood that in the present invention, the accommodation hole  355  should be configured to match the electronic component  312  of the circuit board  31 . A horizontal size of the electronic component  312  determines the size of the accommodation hole  355 . That is, the electronic component  312  should be ensured to be accommodated in the accommodation hole  355 . 
     Further, as shown in  FIG. 37 , in this specific example, the base  35  further has a light through hole  356 . The light through hole  356  is formed in the body  352  of the base  35  and corresponds to the photosensitive chip  32 . The light through hole  356  is configured to place the color filter element  331 . Accordingly, the body  352  of the base  35  also has a cantilever  357 . The cantilever  357  extends integrally to the body  352  and defines the size of the light through hole  356 . The color filter element  331  is placed on the cantilever  357  and filters light received by the module. It should be particularly noted that in this specific example, when the base  35  is provided to the circuit board  31 , the color filter element  331  is placed on the cantilever  357  of the body  352 . When the upper end of at least one of the electronic components  312  is accommodated in the accommodation hole  355 , the top surface of a portion of the electronic component  312  is observed to be higher than the bottom surface of the color filter element  331 . 
     It is worth mentioning that in this specific example, the color filter element  331  can be implemented as a variety of types, including, but not limited to, infrared cutoff filters, full-transmission spectral filters, and other filters or combinations of a plurality of filters. Specifically, for example, the color filter element  331  is implemented as a combination of an infrared cutoff filter and a full-transmission spectral filter. That is, the infrared cutoff filter and the full-transmission spectrum filter can be switched to be selectively located in the photosensitive path of the photosensitive chip  32 . Thus, when the camera module  30  is used in a light-sufficient environment such as daytime, the infrared cutoff filter may be switched to the photosensitive path of the photosensitive chip  32  to filter infrared rays in light reflected by an object entering the camera module  30  by the infrared cutoff filter. And when the camera module  30  is used in a dark environment such as night, the full-transmission spectral filter may be switched to the photosensitive path of the photosensitive chip  32  to allow partial light transmission of infrared rays in light reflected by an object entering the camera module  30 . 
     The color filter element  331  may also be, certainly, provided at other positions in the photosensitive path of the photosensitive chip  32 . For example, the color filter element  331  is provided at the bottom part of the optical lens  332 , the bottom side of the optical lens  332 , etc. which is not limited by the present application. 
     In particular, as shown in  FIG. 37 , in this specific example, the base  35  may be implemented as a conventional plastic bracket, which is preformed and attached to the top surface of the circuit board  31 ; or, the base  35  may be implemented as a molded base, which may be integrally formed by a molding process and attached to the top surface of the circuit board  31 . However, due to the limited molding process of the base  35 , the accommodation hole  355  is provided as a light through hole. That is, the accommodation hole  355  is communicated with the accommodation cavity  354  and the external environment. It should be appreciated that when the camera module  30  is assembled, dirt easily enters through the accommodation hole  355  to cause stain to the photosensitive chip  32 . 
     Therefore, as shown in  FIG. 37 , in this specific example, the camera module  30  further includes a protecting member  38 . The protecting member  38  integrally extends downward from the body  352 . When the base  35  is provided to the circuit board  31 , the protecting member  38  surrounds the photosensitive chip  32 , and the protecting member  38 , the body  352  of the base  35 , and the color filter element  331  provided to the body  352  form a sealed space to prevent dirt from entering the photosensitive chip  32 . 
     In specific implementations, the protecting member  38  may be implemented as a part of the body  352  of the base  35 , which integrally extends downward from the body  352 . When the base  35  is provided to the circuit board  31 , the protecting member  38  surrounds the photosensitive chip  32 , and the protecting member  38 , the body  352  of the base  35 , and the color filter element  331  provided to the body  352  form a sealed space to prevent dirt from entering the photosensitive chip  32 . Or, the protecting member  38  and the base  35  are provided separately. As shown in  FIG. 38 , for example, the protecting member  38  is attached to the base  35  by means of bonding or the like, thereby reducing the difficulty of forming the base  35 . 
     Preferably, the upper end of the accommodation hole  355  may be sealed with a film or a glue, etc., thereby preventing, on one hand, the electronic component  312  from being damaged and further enhancing, on the other hand, the sealing effect to prevent dirt from entering the photosensitive chip  32 . 
     It is worth mentioning that in this specific example, the camera module  30  may be implemented as a fixed focus module or a dynamic focus module. When the camera module  30  is a dynamic focus module, the camera module  30  further includes a driver  36  (the driver may be implemented as, for example but not limited to, a motor, etc.) electrically connected to the circuit board  31 . The driver  36  is configured to controllably drive the lens to move so as to realize auto-focus, as shown in  FIG. 39 . 
     In particular, as shown in  FIG. 39 , the driver  36  includes at least one positioning column  361  extending to a lower end of the driver  36 , and, at least one of the positioning columns  361  is formed at the position of the driver  36  and corresponds to at least one of the accommodation holes  355 , so that when the driver  36  is mounted to the base  35 , the positioning columns are clamped into the accommodation holes  355  in a latching manner. Thus, the mounting accuracy of the driver can be improved by the cooperation of the positioning columns  361  and the accommodation holes  355 , and the reliability of the driver  36  can be improved by the cooperation between the positioning columns and the accommodation holes  355 . 
       FIG. 40  illustrates yet another specific example of the camera module  30  according to the present invention. The camera module  30  illustrated in  FIG. 40  is a modified implementation mode of the camera module  37  illustrated in  FIG. 30 . 
     Specifically, as shown in  FIG. 40 , in this specific example, the protecting member  38  is implemented as a protective film which is attached to the upper end (the top surface of the body  352 ) of the accommodation hole  355 . Thus, when the base  35  is provided to the circuit board  31 , the protective film ensures that the accommodation hole  355  and the accommodation cavity  354  are an enclosed space, so that dirt can be prevented from entering the photosensitive chip  32 , and the protective film may also protect the electronic component  312 . For example, the protective film may be implemented as a film, or the protective film may be formed on the upper end of the accommodation hole  355  by a process such as glue pouring to seal the accommodation hole  355 . 
       FIG. 41  illustrates yet another specific example of the camera module  30  according to the present invention. The camera module  30  illustrated in  FIG. 41  is a modified implementation mode of the camera module  37  illustrated in  FIG. 30 . 
     Specifically, as shown in  FIG. 41 , in this specific example, the electronic components  312  provided to the circuit board  31  are provided on both sides of the circuit board  31 , that is, the photosensitive chip  32  is provided to the circuit board  31 , and the electronic components  312  are located on both sides of the photosensitive chip  32 . Those skilled in the art would know that most of the electronic components  312  located on a circuit board  31  in a conventional camera module are arranged around (or on four sides of) the circuit board  31 . 
     Further, as shown in  FIG. 41 , in this specific example, the protecting member  38  is integrally formed on the body  352  and extends downward from the body  352 . Preferably, the protecting member  38  extends downward from the body  352  in parallel relative to the side wall  353  to form a receiving cavity  358  between the side wall  353  and the protecting member  38 , and, the accommodation hole  355  is formed between the side wall  353  and the protecting member  38  and is communicated with the receiving cavity  358 . 
     Specifically, as shown in  FIG. 41 , in this specific example, the electronic component  312  is arranged at a position on the circuit board  31  such that when the base  35  is attached to the top surface of the circuit board  31 , the electronic component  312  is received in the receiving cavity  358 , and a portion of the electronic component  312  higher than the height of the receiving cavity  358  may be received in the accommodation hole  355 . 
     It should be understood that in this specific example, the position of the side wall  353  and the protecting member  38  should be determined by the manner in which the electronic component  312  is arranged on the circuit board  31 . For example, when the electronic components  312  are arranged in a matrix on both sides of the circuit board  31 , the protecting member  38  extends downward from the body  352  in parallel relative to the side wall  353 , and is formed between the electronic component  312  and the photosensitive chip  32  for isolating the photosensitive chip  32  and preventing dirt from entering the photosensitive chip  32  through the accommodation hole  355 . 
     It is worth noting that in this specific example, the protecting member  38  only needs to be respectively formed between the photosensitive chip  32  and the electronic component  312  for isolating the photosensitive chip  32 , that is, the protecting member  38  does not need to be provided around the photosensitive chip  32  and only needs to be formed on both sides of the photosensitive chip  32 . In other words, in this specific example, the camera module  30  has an extremely narrow side which is formed on a side of the circuit board  31  where the electronic component  312  is not arranged. The mounting positions of the photosensitive chip  32  and the optical lenses  332  are close to an edge of the circuit board  31 . In particular, the extremely narrow side may allow the camera module  30  to be provided at an edge of a smart phone. 
       FIG. 42  illustrates yet another specific example of the camera module  30  according to the present invention. As shown in  FIG. 42 , in this specific example, the camera module  30  includes an optical lens  332 , a base  35 , a color filter element  331 , a photosensitive chip  32 , and a circuit board  31 . The photosensitive chip  32  is conductively provided to the circuit board  31 . The base  35  is integrally formed on the circuit board  31  by means of a molding process. The optical lens  332  and the color filter element  331  are sequentially provided in a photosensitive path of the photosensitive chip  32 . The base  35  is configured to support the color filter element  331 . Thus, imaging light transmitted through the display screen  20  reaches the optical lens  332 , and is filtered by the color filter element  331 , and then reaches the photosensitive chip  32  to be sensed by the photosensitive chip  32  for performing an imaging reaction. 
     In particular, this specific example is an optimization solution of a conventional camera module based on a molding process. Those skilled in the art would know that in the conventional camera module based on the molding process, a photosensitive chip and an electronic component are usually attached to a circuit board, a molded base is formed on the circuit board by a molding process, a filter is attached to a lens base, and a lens is then attached to a filter assembly so that the lens is held in a photosensitive path of the chip, as shown in  FIG. 42 . However, the assembly mode of the prior art greatly limits the height of the camera module. 
     In detail, although the lateral size and height of the camera module can be reduced by replacing the conventional lens base with a molded base, a mold used in the molding process needs to avoid electronic components such as a capacitor and a resistor on the circuit board (especially the size of the capacitor is large, and the height of the smallest capacitor at present is also 0.38 mm), and a certain safety distance is also reserved between the mold and various electronic components. Therefore, the height of the molded base is also at least greater than 0.4 mm. On the other hand, a filter is usually formed into a filter assembly together with a support member, and the filter assembly is then attached to the molded base. Since the support member is usually made by an injection molding process, the thickness of the portion of the support member supporting the filter is required to be substantially greater than 0.15 mm, while the thickness of the filter is usually more than 0.21 mm. Therefore, the thickness of the filter assembly is at least greater than 0.36 mm. 
     That is, the distance between the lens and the circuit board  31  is equal to the sum (at least greater than 0.76 mm) of the height of the molded base and the thickness of the filter assembly. The distance between the lens and the circuit board  31  of the camera module in the prior art cannot be further reduced due to all the above-described factors, that is, the height of the camera module in the prior art cannot be further reduced, so that the market requirements for lightness, thinness, and miniaturization of the camera module cannot be met. 
     Accordingly, as shown in  FIG. 43 , in this specific example, the molded base has a recessed step portion for mounting the color filter element  331  thereon. That is, in this specific example, the top surface of the molded base is a non-flat surface having a recessed step portion, as compared with a conventional camera module based on a molding process. Accordingly, by mounting the color filter element  331  on the recessed step portion of the molded base, it is possible to eliminate a color filter element support member and reduce the distance between the color filter element  331  and the circuit board  31 , thereby achieving the effect of reducing the height of the module. 
     Specifically, as shown in  FIG. 43 , in this specific example, the molded base has a stepped peripheral groove  350 . The color filter element  331  of the light transmitting assembly  33  is provided in the stepped peripheral groove  350  of the molded base. In this way, the distance between the optical lens  332  and the circuit board  31  is no longer limited by the thickness of the color filter element  331 . That is, the distance between the optical lens  332  and the circuit board  31  can be reduced to be smaller than the sum of the thickness of the color filter element  331  and the height of the molded base, and the overall height size of the camera module  30  is reduced. 
       FIG. 44  illustrates yet another specific implementation of the photosensitive chip  32 B according to the present invention. As shown in  FIG. 44 , in this specific example, optimization is performed from the perspective of the structure of the photosensitive chip to reduce the overall height size of the camera module  30 . In other words, in this specific implementation, the camera module  30  may be implemented as a camera module and modified implementation modes thereof as described in any of  FIGS. 39-43 . 
     Specifically, in this specific example, the camera module  30  adopts a quantum dot thin film photosensitive chip  32 A instead of a conventional CMOS/CCD photosensitive chip. The quantum dot thin film photosensitive chip  32 B has dual advantages of a planar size and a height size as compared with the conventional CMOS/CCD photosensitive chip. 
     First, the use of the quantum dot thin film photosensitive chip  32 B enables the size of the photosensitive chip in a Z-axis direction to be reduced. As shown in  FIG. 44 , the quantum dot thin film photosensitive chip  32 B respectively includes, from top to bottom, a color filter  321 B, a top electrode  322 B, a quantum dot thin film  323 B, a bottom electrode  324 B, and a pixel circuit  325 B. The top electrode  322 B, the quantum dot thin film  323 B, and the bottom electrode  324 B constitute a photosensitive layer of the quantum dot thin film photosensitive chip  32 B. The quantum dot thin film  323 B is electrically connected to two electrodes. The current and/or voltage between the two electrodes is related to the intensity of light received by the quantum dot thin film  323 B. The pixel circuit  325 B includes a charge storage and read circuit. In particular, the color filter may be implemented as a Bayer filter or a Mono filter, which is not limited by the present application. 
     In the working process, light passing through the color filter  321 B irradiates the photosensitive layer. The photosensitive layer generates a charge between the top electrode and the bottom electrode at a given bias voltage such that the voltage accumulates in charge storage for an integration period. The pixel circuit  325 B reads an electrical signal transmitted to the chip. The electrical signal reflects a signal of the light intensity absorbed by the photosensitive layer during the integration period. The electrical signal is the light intensity generated by the light passing through the color filter  321 B. Therefore, the electric signal can correspond to the light passing through the color filter  321 B. That is, if the color filter  321 B is red, it means that only red light can be transmitted. The electrical signal generated by the corresponding photosensitive layer under the color filter  321 B is then representative of the intensity of the red light in light at this position. 
     The quantum dot thin film photosensitive chip  32 B has a relatively small thickness size as compared with the conventional CMOS or CCD chip. 
       FIG. 45  is yet another specific illustration of the photosensitive chip  32 B of the camera module  30  according to the present invention. The photosensitive chip  32 B illustrated in  FIG. 45  is a modified implementation mode of the photosensitive chip illustrated in  FIG. 44 . 
     Specifically, as shown in  FIG. 45 , in this specific example, the quantum dot thin film  323 B of the photosensitive layer is configured to respond to light of a selected color or group of colors. For example, color sensitivity can be achieved by combining a photoconductive material and a wavelength selective absorbing material (e.g. a material forming a color filter  321 B array) to form a color sensitive pixel. Accordingly, the quantum dot thin film  323 B may be configured to be sensitive to three colors of red (R), green (G), and blue (B), respectively, so that the color filter  321 B in the photosensitive chip may be directly eliminated. 
     In the working process, when light passes through the color sensitive pixel, the color sensitive pixel will absorb the corresponding light, convert the light intensity of the light of this wavelength or waveband into an electrical signal, and transmit the electrical signal to the chip via the pixel circuit  325 B for processing and imaging, while the remaining light continues to propagate forward, so that the photoelectric conversion of the pixel point is not influenced. Accordingly, the Z-direction size of the photosensitive chip can be reduced by adopting this technical solution, and meanwhile, the photosensitive chip may receive more light and may image clearer since there is no filtering of light by the color filter  321 B. 
     Further, the use of the quantum dot thin film photosensitive chip  32 B enables the size of the photosensitive chip in X/Y-axis directions to be reduced. Specifically, since the light transmittance of the quantum dot thin film  323 B is high, after a material sensitive to a certain wavelength or waveband is configured, the quantum dot thin film  323 B may only absorb the corresponding light, while other light may transmit the thin film and continue to propagate forward. Therefore, a plurality of quantum dot thin films  323 B sensitive to a certain wavelength or waveband of light may be vertically arranged. 
     In other words, light intensity information of multiple wavelengths or wavebands may be acquired simultaneously at a pixel point position. For example, three quantum dot thin films  323 B of a red color sensitive pixel, a green color sensitive pixel and a blue color-sensitive pixel are vertically arranged. When light passes through the red color sensitive pixel, red light is absorbed and converted into an electrical signal, and the remaining light continues to propagate forward. When light passes through the green color sensitive pixel, green light is absorbed and converted into an electrical signal, and the remaining light continues to propagate forward. After reaching the blue color sensitive pixel, blue light is also absorbed and converted into an electrical signal. Therefore, the light intensity information of multiple wavelengths or wavebands of light may be acquired simultaneously at a pixel-sized point. 
     It is worth mentioning that three colors RGB described in this specific example of the present application are not limiting, and each quantum dot thin film  323 B may absorb and convert any desired light, only the quantum dot thin film  323 B needs to be configured to be sensitive to the desired light. 
     Also, in this specific example, since the conventional color filter  321 B is not used, it is possible to obtain not only a stronger light intensity but also a higher resolution of the photosensitive chip of the same specification. In other words, at the same resolution, the method adopted in the present solution may reduce the XY-direction size of the photosensitive chip, thereby further reducing the planar size of the camera module  30 . 
     Also, the quantum dot thin film  323 B in the quantum dot thin film chip referred to in the present application may be prepared by means of the following process. 
     In one form, a quantum dot material may be processed by molten pool casting to form the quantum dot thin film  323 B. The molten pool casting may include: depositing a measured quantum dot material onto a substrate and allowing a solution to evaporate. A generated film may or may not crack. 
     In one form, a quantum dot material may be processed by electro-deposition to form the quantum dot thin film  323 B. 
     In one form, a quantum dot material may be processed by vapor deposition to form the quantum dot thin film  323 B. 
     In one form, a quantum dot material may be processed by gun spraying to form the quantum dot thin film  323 B. The gun spraying may include processing from a gas. The gun spraying may include entrainment in a solvent. 
     In one form, a quantum dot material may be processed by growth from a solution to form the quantum dot thin film  323 B. The growth of a film from a solution may include cross-linking. A cross-linking agent may be attached to at least a part of a substrate to cross-link quantum dots. When a substrate having an attached cross-linking agent is immersed in a solution of quantum dots, the quantum dots may become cross-linked and grow at a position on the substrate where the cross-linking agent is attached, and the process of growth may be similar to that of seed growth. Since growth occurs where the cross-linking agent has been attached, the formation of a patterned film on the substrate may be achieved by depositing the cross-linking agent along the patterned substrate. 
     In one form, a film may be formed by processing a quantum dot material by means of a drainage system. The drainage system may enable deposition of a single layer of the quantum dot thin film  323 B of quantum dots, and the quantum dot thin film  323 B may be deposited in a pattern. 
     In one form, a quantum dot material may be processed by vapor acceleration or evaporation to form the quantum dot thin film  323 B. 
     In one form, a quantum dot material may be processed by screen-printing to form the quantum dot thin film  323 B. 
     In one form, a quantum dot material may be processed by ink-jet printing to form the quantum dot thin film  323 B. 
     In summary, the camera module  30  provided below the display screen can be implemented by using, but not limited to, the technical solutions listed above and modified implementation modes thereof, so that the size of the camera module  30  in the height direction thereof is reduced, so as to meet the requirements of thin smart phones. 
       FIG. 46  is a specific illustration of the photosensitive layer of the above photosensitive chip  32 B. The photosensitive layer includes the top electrode  322 B, the quantum dot thin film  323 B, and the bottom electrode  324 B. 
     In the present example, the top electrode  322 B and the bottom electrode  324 B of the photosensitive layer are provided to be distributed horizontally, thereby reducing the influence on light propagation. 
     Specifically, the photosensitive layer further includes a nanocrystal film  326 B and a substrate  327 B. The nanocrystal film  326 B is located above the top electrode  322 B and the bottom electrode  324 B. The nanocrystal film  326 B is a transparent material. The substrate  327 B is located at the lowermost end of the photosensitive layer. 
     The top electrode  322 B and the bottom electrode  324 B are located between the nanocrystal film  326 B and the substrate  327 B, and at least a part of the nanocrystal film  326 B extends to the substrate  327 B. 
     The entire photosensitive layer may be a laterally stacked structure. The top electrode  322 B of the photosensitive layer is located between the nanocrystal film  326 B and the substrate  327 B. The bottom electrode  324 B of the photosensitive layer is located between the nanocrystal film  326 B and the substrate  327 B. The bottom electrode  324 B and the top electrode  322 B are respectively supported on the substrate  327 B. The top electrode  322 B and the bottom electrode  324 B do not overlap in the height direction. The top electrode  322 B and the bottom electrode  324 B are horizontally provided between the nanocrystal film  326 B and the substrate  327 B. The substrate  327 B may be a glass substrate  327 B, the top electrode  322 B may be a metal contact, and the bottom electrode  324 B may be a metal contact. 
     The quantum dot thin film  323 B covers the top of the substrate  327 B and the bottom electrode  324 B is located on the top of the quantum dot thin film  323 B. 
       FIG. 47  is a specific illustration of the photosensitive layer of the above photosensitive chip  32 B. The photosensitive layer includes the top electrode  322 B, the quantum dot thin film  323 B, and the bottom electrode  324 B. 
     The top electrode  322 B and the bottom electrode  324 B at least partially overlap in the height direction. 
     In the present example, the top electrode  322 B is located on the top of the photosensitive layer, and the bottom electrode  324 B is located below the top electrode  322 B. 
     The photosensitive layer further includes a nanocrystal film  326 B and a substrate  327 B. The nanocrystal film  326 B is located between the top electrode  322 B and the bottom electrode  324 B. The substrate  327 B is located below the bottom electrode  324 B. 
     The top electrode  322 B is provided as a transparent material to reduce the influence of light passing through the top electrode  322 B. 
     Further, the quantum dot thin film  323 B is located between the substrate  327 B and the bottom electrode  324 B. 
     Referring to  FIGS. 48A to 51C , an assembling method of the camera module  30  and the display screen  20  with the light through hole  200  according to the present invention is illustrated. It will be understood that the display screen  20  may also be provided with the light guide channel  500  and/or the light through hole  200 . The light through hole  200  penetrating in the height direction is exemplified herein. 
     The present invention provides an assembly system  60 . The assembly system  60  includes a clamping device  61 , a test unit  62 , and a support platform  63 . The clamping device  61  is located above the support platform  63  for clamping the camera module  30 . The display screen  20  is supported on the support platform  63 . 
     The clamping device  61  can clamp the camera module  30  so as to drive the camera module  30  to move so as to change relative positions of the camera module  30  and the display screen  20  supported on the support platform  63 . Thus, an imaging effect of the camera module  30  when the camera module  30  and the display screen  20  are at various positions is obtained by the test unit  62 , and mounting positions of the camera module  30  and the display screen  20  are further determined. The assembly system  60  further includes a loading unit  64 . After determining the relative positions of the camera module  30  and the display screen  20  based on the test unit  62 , the loading unit  64  may load materials to the camera module  30  and/or the display screen  20  so that the camera module  30  and the display screen  20  can be fixed at a proper mounting position to be confirmed. 
     Further, the test unit  62  includes a light source  621 , a target plate  622 , and a sensing device  623 . The light source  621  is provided near a light entering position of the camera module  30 . The target plate  622  may be located in front of the light source  621 . That is, the light source  621  is located between the target plate  622  and the camera module  30 . The target plate  622  may also be located behind the light source  621 . That is, the target plate  622  is located between the light source  621  and the camera module  30 . The light source  621  may also be located on the target plate  622  to provide uniform light to the target plate  622 . 
     The light source  621  emits light when in operation, and the sensing device  623  obtains a real-time working image about the target plate  622  from the camera module  30 , and adjusts the position of the camera module  30  based on the working image to obtain a desired imaging effect of the camera module  30 . 
     Specifically, the display screen  20  may be assembled by first adjusting the distance from the camera module  30  to the display screen  20  to an appropriate value, and then adjusting an optical axis of the camera module  30  to coincide with the center of the light through hole  200  of the display screen  20 . The adjustment may be as follows. 
     When the camera module  30  is located at a position relative to the display screen  20 , the sensing device  623  may sense the optimum position of the camera module and the display screen, particularly the coincidence of the optical axes, calculate a relative adjustment amount (an adjustment amount of the camera module  30  relative to the display screen  20 ) of the other one of the camera module and the display screen on the basis of one of the camera module and the display screen (e.g., the display screen  20 ), and then make corresponding adjustment according to the adjustment amount. After the adjustment, the optical axis conditions of the camera module and the display screen are calculated again. If a desired detection result is obtained, a module is assembled at the position, otherwise, the adjustment is continued until the positions of the camera module and the display screen reach an optimal state, that is, the imaging of the camera module  30  has an optimal state. Meanwhile, the assembly of the camera module  30  and the display screen  20  does not influence the mounting and working of other components. The position adjustment of the camera module  30  relative to the display screen  20  is also, certainly, within a range that allows the camera module  30  to be mounted. 
     Further, in the present example, the camera module  30  is located above the display screen  20 , and the camera module  30  is located above the support platform  63 . The light source  621  and the target plate  622  are located below the display screen  20 . In other words, the display screen  20  is supported on the support platform  63  with a back side facing upward. The camera module  30  is mounted on the back side of the display screen  20  in a subsequent step. 
     The clamping device  61  and the loading unit  64  operate above the support platform  63 , so that the relative positions of the camera module  30  and the display screen  20  may be observed in time above the support platform  63 , thereby facilitating operation, especially in the case of manual operation. It will be, certainly, understood by those skilled in the art that the assembly process of the camera module  30  and the display screen  20  may be accomplished by a complete set of automated device. 
     In other embodiments of the present invention, the camera module  30  is located below the display screen  20 , the light source  621  and the target plate  622  are located above the display screen  20 , and the camera module  30  receives light from top to bottom for photoelectric conversion. At this moment, if it is necessary to observe the relative positions of the camera module  30  and the display screen  20 , it is necessary to observe below the support platform  63 . 
     Further, preferably, the display screen  20  is located at a horizontal position, and the camera module  30  may be located above the display screen  20  or below the display screen  20  depending on different orientations of the back side of the display screen  20 . 
     It will be certainly understood that the display screen  20  may be located at an oblique position. For example, the support platform  63  is oblique. The position of the camera module  30  relative to the position of the display screen  20  may be adjusted by the clamping device  61 . The display screen  20  may also be located at a vertical position. For example, the support platform  63  is located at a vertical position. The camera module  30  and the display screen  20  are adjusted relatively at the vertical position, respectively. 
     Further, the support platform  63  has a mounting space  630 . The mounting space  630  is located on the support platform  63 . The display screen  20  can be fixedly accommodated in the mounting space  630 . 
     The support platform  63  has a test hole  6300 . The mounting space  630  is communicated with the test hole  6300 . When the display screen  20  is fixed in the mounting space  630 , the test hole  6300  corresponds to the light through hole  200  of the display screen  20 , so that light can enter the light through hole  200  of the display screen  20  via the test hole  6300 , and then reach the camera module  30  via the light through hole  200 . 
     The test hole  6300  penetrates through the support platform  63  so that light on one side of the support platform  63  can reach the other side of the support platform  63  via the test hole  6300 . 
     The test hole  6300  may be configured in a certain shape according to the test requirements. For example, in the present example, the shape of the test hole  6300  is conical. As the test hole is closer to the display screen  20 , an inner diameter of the test hole  6300  is smaller, and as the test hole is farther away from the display screen  20 , the inner diameter of the test hole  6300  is larger. 
     The test hole  6300  may serve to converge light. 
     The support platform  63  includes a platform body  631  and a fixing assembly  632 . The fixing assembly  632  is provided to the platform body  631 , and the fixing assembly  632  is configured to fix the display screen  20 . 
     In the present example, the fixing member  632  is integrally formed on the platform body  631 . The mounting space  630  is formed on the platform body  631 . The fixing member  632  is provided to the platform body  631  and accommodated in the mounting space  630 . 
     The display screen  20  can be mounted to the fixing assembly  632 , and the relative positions of the display screen  20  and the platform body  631  are fixed with the aid of the fixing assembly  632 . Thus, only the position of the camera module  30  is required to realize the adjustment of the relative positions of the display screen  20  and the camera module  30 , until a position of the camera module  30  with a better imaging effect relative to the display screen  20  is found. 
     In other embodiments of the present invention, the fixing assembly  632  is detachably mounted to the platform body  631 . The fixing assembly  632  may be sized to adapt to the size of the display screen  20 . For example, if the mounting space  630  provides an area of 7 inches, the fixing assembly  632  may provide an area of about 7 inches for mounting the display screen  20 . If the display screen  20  of 5 inches needs to be assembled, the fixing assembly  632  may be replaced with a fixing assembly  632  capable of providing an area of about 5 inches to adapt to the size adjustment of the display screen  20 . 
     Further, in other embodiments of the present invention, the clamping device  61  clamps the camera module  30  and the display screen  20 , respectively, and then finds an appropriate assembly position by changing the relative positions of the camera module  30  and the display screen  20 . 
     In other embodiments of the present invention, the support platform  63  supports the camera module  30 , the clamping device  61  clamps the display screen  20 , and the clamping device  61  then drives the display screen  20  to move so as to change the position of the display screen  20 . Thus, while keeping the camera module  30  fixed, the relative positions of the camera module  30  and the display screen  20  are changed until a satisfactory imaging effect is obtained. 
     Further, in the present example, the assembly system  60  includes a limiting mechanism  65 . The limiting mechanism  65  is provided to the display screen  20  and located near the position of the light through hole  200  of the display screen  20 . 
     The limiting mechanism  65  is configured to limit the position of the camera module  30  so as to improve the alignment accuracy of the camera module  30  and the display screen  20 . 
     Specifically, when the relative positions of the camera module  30  and the display screen  20  are changed to test an imaging effect, the limiting mechanism  65  may play a limiting role on the position change of the camera module  30 , so that the position adjustment of the camera module  30  is controlled within a certain range, and the position adjustment amplitude of the camera module  30  at a single time is avoided to be too large, thereby facilitating improvement of the alignment accuracy of the camera module  30  and the display screen  20 . 
     The limiting mechanism  65  is provided on the back side of the display screen  20  and aligned with the light through hole  200  of the display screen  20 , so that when the camera module  30  is mounted to the limiting mechanism  65 , the camera module  30  can be aligned with the light through hole  200  of the display screen  20 . 
     The camera module  30  is then mounted to the limiting mechanism  65 . The camera module  30  mounted to the limiting mechanism  65  is aligned with the light through hole  200  of the display screen  20  and the relative positions of the camera module  30  and the limiting mechanism  65  can be finely adjusted. 
     Then, an image formed by the camera module  30  is acquired by a test device, and the camera module  30  and the limiting mechanism  65  are adjusted based on the imaging effect of the camera module  30  so as to change the relative positions of the camera module  30  and the display screen  20 . The adjustment space provided by the limiting mechanism  65  is limited, and the relative positions of the camera module  30  and the display screen  20  can only be adjusted within a small range, so that the position of the camera module  30  is not greatly shifted during this adjustment process, thereby facilitating improvement of the alignment accuracy of the camera module  30  and the display screen  20 . 
     After determining the relative positions of the camera module  30  and the display screen  20  based on the imaging effect of the camera module  30 , the relative positions of the camera module  30  and the limiting mechanism  65  are fixed, thereby fixing the relative positions of the camera module  30  and the display screen  20 . The camera module  30  is assembled on the display screen  20 , and the camera module  30  can obtain sufficient light through the light through hole  200  of the display screen  20  and obtain a desired imaging effect. 
     Further, in other embodiments of the present invention, the limiting mechanism  65  is provided to the camera module  30 . Specifically, the limiting mechanism  65  and the camera module  30  are first mounted to each other, the limiting mechanism  65  is fixed to the display screen  20 , and the camera module  30  located on the limiting mechanism  65  can correspond to the light through hole  200  of the display screen  20 . 
     The limiting mechanism  65  provides a certain adjustment space for the camera module  30  mounted to the limiting mechanism  65 . 
     After the limiting mechanism  65  is mounted to the display screen  20 , the relative positions of the camera module  30  and the limiting mechanism  65  may be adjusted based on the imaging effect of the camera module  30 , thereby confirming the relative positions of the camera module  30  and the display screen  20 . 
     It is worth mentioning that when the limiting mechanism  65  is mounted to the display screen  20 , the camera module  30  has been mounted to the limiting mechanism  65 . Therefore, the relative positions of the limiting mechanism  65  and the display screen may be determined based on the imaging effect of the camera module  30 , and the limiting mechanism  65  is then positioned on the display screen  20 . The limiting mechanism  65  and the display screen  20  may be fixed by means of gluing or welding. 
     In other words, the limiting mechanism  65  may be mounted to the camera module  30  or the display screen  20  before the camera module  30  is mounted to the display screen  20 . The relative positions of the camera module  30  and the limiting mechanism  65  may be then adjusted within an adjustable range of the limiting mechanism  65  based on the imaging effect of the camera module  30 , thereby adjusting the relative positions of the camera module  30  and the display screen  20 . 
     Further, the limiting mechanism  65  has a limiting channel  650 . The lens assembly of the camera module  30  may be at least partially accommodated in the limiting channel  650 . 
     When the limiting mechanism  65  is located on the display screen  20 , the limiting channel  650  of the limiting mechanism  65  is aligned with the light through hole  200  of the display screen  20 . 
     The limiting mechanism  65  and the camera module  30  cooperate with each other so that when the camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  may play a limiting role for the camera module  30 . Meanwhile, the camera module  30  may make an adjustment within a certain range in the limiting channel  650  provided by the limiting mechanism  65  so as to change the relative positions of the camera module  30  and the display screen  20 . 
     Specifically, the limiting mechanism  65  may include a sleeve  651  and a limiting assembly  652 . The sleeve  651  surrounds the limiting channel  650 . The limiting assembly  652  includes a first limiting member  6521  and a second limiting member  6522 . The first limiting member  6521  is provided to an inner wall of the sleeve  651 , and the second limiting member  6522  is provided to an outer wall of the lens assembly of the camera module  30 . 
     When the camera module  30  is mounted to the limiting mechanism  65 , the first limiting member  6521  and the second limiting member  6522  relatively cooperate to define the position of the camera module  30 . 
     The first limiting member  6521  may be a directional groove, and the second limiting member  6522  may be a protrusion. When the camera module  30  is mounted to the limiting mechanism  65 , the second limiting member  6522  extends into the first limiting member  6521 . 
     The first limiting member  6521  may be a protrusion, and the second limiting member  6522  may be a groove. When the camera module  30  is mounted to the limiting mechanism  65 , the first limiting member  6521  extends into the second limiting member  6522 . 
     It is worth noting that when the camera module  30  is mounted to the limiting mechanism  65 , the first limiting member  6521  and the second limiting member  6522  are not completely fixedly clamped with each other. A certain movable space is also left between the first limiting member  6521  and the second limiting member  6522 , so that the position of the camera module  30  relative to the sleeve  651  may be further adjusted while being limited by the limiting assembly  652 . 
     Further, the inner wall of the sleeve  651  may be provided in a threaded structure, and an outer wall of an upper portion of the camera module  30 , i.e. an outer wall of a lens barrel of the lens assembly, may be at least partially provided in a threaded structure. 
     When the camera module  30  is mounted to the limiting mechanism  65 , not only the relative positions of the camera module  30  and the limiting mechanism  65 , in particular, the axis of the camera module  30  and the center of the light through hole  200  of the display screen  20  may be adjusted relatively, and the distance between the camera module  30  and the display screen  20  may also be adjusted. 
     It will be certainly understood that if the limiting mechanism  65  needs to be mounted to the display screen  20 , the distance between the camera module  30  and the display screen  20  may be adjusted by controlling the distance between the limiting mechanism  65  and the display screen  20  during the mounting of the limiting mechanism  65  to the display screen  20 . 
     Preferably, the center of the sleeve  651  of the limiting mechanism  65  is aligned with the center of the light through hole  200  of the display screen  20 . Further, preferably, the center of the sleeve  651  of the limiting mechanism  65  is aligned with the center of the test hole  6300  of the test platform  63 . 
     Referring to  FIGS. 51A to 51C , a specific implementation of the limiting mechanism  65  according to the present invention is illustrated. In the present example, the limiting mechanism  65  needs to be mounted to the display screen  20 . That is, the limiting mechanism  65  and the display screen  20  are originally independent of each other. 
     The assembly method of the camera module  30  includes the following steps. The limiting mechanism  65  is mounted to the display screen  20 , the camera module  30  is mounted to the limiting mechanism  65 , the position of the camera module  30  is adjusted relative to the limiting mechanism  65  so as to achieve the purpose of adjusting the position of the camera module  30  relative to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are confirmed on the basis of the imaging effect of the camera module  30 , and the camera module  30  and the display screen  20  are fixed at an adjusted position by fixing the camera module  30  to the limiting mechanism  65 . 
     It is worth noting that the limiting mechanism  65  may be mounted to the display screen  20  by aligning the limiting mechanism  65  with the light through hole  200  of the display screen  20 . 
     It will be understood that in the mounting process of the limiting mechanism  65  to the display screen  20 , the limiting mechanism  65  may be fixed to the display screen  20  based on the degree of alignment of the limiting channel  650  of the limiting mechanism  65  with the light through hole  200  of the display screen  20 . In this way, adjustment of the relative positions between the camera module  30  and the display screen  20  during subsequent adjustments only requires adjustment of the relative positions between the camera module  30  and the limiting mechanism  65 . 
     The assembly method of the camera module  30  may also be implemented as the following steps. The camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  is mounted to the display screen  20 , the position of the camera module  30  is adjusted relative to the limiting mechanism  65  so as to achieve the purpose of adjusting the position of the camera module  30  relative to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are confirmed on the basis of the imaging effect of the camera module  30 , and the camera module  30  and the display screen  20  are fixed at an adjusted position by fixing the camera module  30  to the limiting mechanism  65 . 
     It will be understood that in the mounting process of the limiting mechanism  65  to the display screen  20 , the limiting mechanism  65  may be mounted to the display screen  20  based on the imaging effect of the camera module  30 . 
     The assembly method of the camera module  30  may also be implemented as the following steps. The relative positions of the camera module  30  and the display screen  20  are adjusted to a more satisfactory position. The limiting mechanism  65  is mounted to the display screen  20 , and the relative positions of the camera module  30  and the limiting mechanism  65  are then adjusted within a range of the limiting mechanism  65  where the camera module  30  may be adjusted, thereby adjusting the relative positions of the camera module  30  and the display screen  20 . 
     It will be understood that after the camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  may be fixed to the display screen  20 , so that the camera module  30  can be adjusted within a relatively small range by the limiting mechanism  65  so as to improve the adjustment accuracy of the camera module  30  and the limiting mechanism  65 . Or, after the camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  is temporarily not fixed to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are continuously changed to obtain a relatively satisfactory imaging effect, and the limiting mechanism  65  is then fixed to the display screen  20 . 
     Further, in the present example, the back side of the display screen  20  is implemented as a planar structure. That is, the back plate of the display screen  20  is a planar structure, and the limiting mechanism  65  is mounted to the back plate of the display screen  20 . When the relative positions between the limiting mechanism  65  and the display screen  20  need to be adjusted, the limiting mechanism  65  is freely adjusted on the display screen  20  until the limiting channel  650  of the limiting mechanism  65  is aligned with the light through hole  200  of the display screen  20 , or the camera module  30  mounted to the limiting mechanism  65  obtains a desired imaging effect. 
     It will be certainly understood that the relative positions of the camera module  30  and the display screen  20  may also be adjusted directly. When the relative positions between the camera module  30  and the display screen  20  are determined, the camera module  30  may be directly fixed to the display screen  20  by means of gluing or welding, etc., and the positions of the camera module and the display screen may be maintained at the adjusted position. 
     Furthermore, after the relative positions of the limiting mechanism  65  and the camera module  30  are confirmed based on the imaging effect of the camera module  30 , the limiting mechanism  65  and the camera module  30  may be fixed by means of gluing, welding, etc. 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, the space of the limiting channel  650  of the limiting mechanism  65  not occupied by the camera module  30  may be filled with a colloid to fix the relative positions of the camera module  30  and the limiting mechanism  65 . 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, an insert piece may be inserted between the camera module  30  and the sleeve  651  of the limiting mechanism  65  to fix the relative positions of the camera module  30  and the limiting mechanism  65 . The insert piece limits the displacement of the camera module  30  relative to the limiting mechanism  65 . 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, a welding pad may be provided on the outer side of the lens barrel of the camera module  30  or the inner wall of the sleeve  651  of the limiting mechanism  65 , and the camera module  30  and the limiting mechanism  65  are then fixed by means of welding. 
     It will be understood that the colloid used for fixing the camera module  30  and the limiting mechanism  65  may be a thermoplastic fluid, and when the thermoplastic fluid fills the gap between the camera module  30  and the limiting mechanism  65 , the thermoplastic fluid of the camera module  30  and the limiting mechanism  65  may be cured by means of heating. 
     Further, the sleeve  651  of the limiting mechanism  65  is provided with an opaque material to reduce the influence of external light on the camera module  30  located in the limiting channel  650  of the limiting mechanism  65 . Especially when the display screen  20  is an LCD screen  20 , the back plate layer  27  can actively emit light, and the opaque limiting mechanism  65  can reduce the influence of the light-emitting back plate layer  27  on the camera module  30 . 
     Referring to  FIG. 52 , a specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. In the present example, the limiting mechanism  65  further includes a connecting portion  653 . The connecting portion  653  is configured to connect the sleeve  651  to the display screen  20 . 
     Specifically, the sleeve  651  has a free end  6511  and a connecting end  6512 . The free end  6511  and the connecting end  6512  are respectively located at both ends, and the connecting portion  653  is located at the connecting end  6512  of the sleeve  651 . 
     The connecting portion  653  may be configured to extend outward from the connecting end  6512  of the sleeve  651 . When the limiting mechanism  65  and the display screen  20  are mounted, the connecting portion  653  of the limiting mechanism  65  can be connected to the display screen  20 . Meanwhile, the connecting portion  653  increases the area size of the limiting mechanism  65  connectable to the display screen  20 , so as to facilitate the stable connection of the limiting mechanism  65  and the display screen  20 . Thus, it is advantageous to stably mount the camera module  30  to the display screen  20  by the limiting mechanism  65 . 
     Referring to  FIG. 53 , a specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. In the present example, the relative positions of the limiting mechanism  65  and the display screen  20  are fixed in advance, and it is only necessary to adjust the relative positions of the camera module  30  and the limiting mechanism  65 . 
     The limiting mechanism  65  is combined to the display screen  20  to facilitate enhancement of the combination strength of the limiting mechanism  65  to the display screen  20 . 
     In the present example, the limiting mechanism  65  is embedded into the display screen  20 . 
     For example, when the display screen  20  is an OLED display screen  20 , the display screen  20  includes the cover plate layer  21 , the touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27 , referring to the previous figures. The back side of the display screen  20  is a planar structure, that is, the back plate layer  27  is a planar structure, and the display screen  20  has the light through hole  200  penetrating through at least a part of the display screen. For example, the light through hole  200  penetrates through the layers other than the cover plate layer  21  in the height direction. The light through hole  200  may, certainly, penetrate through the layers of the display screen  20  completely in the height direction. 
     At least a part of the limiting mechanism  65  is embedded into the drive circuit layer  26  and the back plate layer  27 . 
     The limiting mechanism  65  further includes at least one connecting pin  654 . The connecting pin  654  extends from the connecting end  6512  of the sleeve  651  along the length direction of the sleeve  651 . Preferably, there may be a plurality of connecting pins  654 . 
     The display screen  20  has at least one embedded channel  203 . The embedded channel  203  is located around the light through hole  200  of the display screen  20 , and the embedded channel  203  is matched to the connecting pin  654  of the limiting mechanism  65 . 
     The embedded channel  203  extends from the back plate layer  27  to the drive circuit layer  26 . Preferably, the embedded channel  203  is provided to avoid the circuit structure of the drive circuit layer  26  to reduce the influence on the working efficiency of the display screen  20 . 
     When the limiting mechanism  65  is mounted to the display screen  20 , the connecting pin  654  of the limiting mechanism  65  extends into the embedded channel  203  of the display screen  20 . The connecting pin  654  may be embedded into the embedded channel  203 . The embedded channel  203  may also be slightly larger than the connecting pin  654 . When the connecting pin  654  extends into the embedded channel  203 , a gap remains in the embedded channel  203 . At this moment, a colloid may be filled inward, so that the connecting pin  654  of the limiting mechanism  65  can be fixed to the embedded channel  203  of the display screen  20 , thereby facilitating the limiting mechanism  65  to be stably mounted to the display screen  20 . 
     Further, the embedded channel  203  may be formed on the back plate layer  27  and the drive circuit layer  26  of the display screen  20  by means of perforating. For example, a hole is drilled from the back plate layer  27  of the display screen  20  to the drive circuit layer  26 . 
     It will be understood by those skilled in the art that the manner in which the embedded channel  203  is formed or the position of the embedded channel  203  is not limited to the above examples. 
     Furthermore, according to other embodiments of the present invention, the embedded channel  203  may be formed on the sleeve  651 , and the connecting pin  654  may be formed on the display screen  20 . 
     When the limiting mechanism  65  is mounted to the display screen  20 , the connecting pin  654  located on the display screen  20  extends into the embedded channel  203  of the sleeve  651 , thereby facilitating fixation between the limiting mechanism  65  and the display screen  20 . 
     The connecting pin  654  may be formed on the display screen  20  by means of deposition, evaporation, etc. The connecting pin  654  may be integrally formed on the display screen  20 . 
     Furthermore, according to other embodiments of the present invention, the embedded channels  203  may be formed on the sleeve  651  and the display screen  20 , respectively, and the connecting pins  654  can be embedded into the sleeve  651  and the display screen  20 , respectively. For example, one end of the connecting pin  654  extends into the embedded channel  203  of the display screen  20 , and the other end of the connecting pin  654  then extends into the embedded channel  203  of the sleeve  651 . The connecting pin  654  and the display screen  20  and the connecting pin  654  and the sleeve  651  are respectively fixed, thereby fixing the sleeve  651  to the display screen  20 . 
     Referring to  FIG. 54 , another specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. 
     In the present example, the display screen  20  has a mounting channel  201 . The light through hole  200  penetrates through the mounting channel  201 . The light through hole  200  penetrates through the layers of the display screen  20  other than the cover plate layer  21  in the height direction, and the mounting channel  201  is exposed on the back side of the display screen  20 . 
     The inner diameter of the mounting channel  201  is larger than that of the light through hole  200 . At least a part of the limiting mechanism  65  can be accommodated in the mounting channel  201 . 
     For example, the mounting channel  201  is formed on the back plate layer  27  of the display screen  20 . 
     The mounting channel  201  penetrates through the back plate layer  27 , and the inner diameter of the mounting channel  201  is larger than that of the light through hole  200 . The mounting channel  201  penetrates through the light through hole  200  of the back plate layer  27  in the height direction. Light from the outside of the display screen  20  passes through the light through hole  200  and the mounting channel  201 , and is then received by the camera module  30 . 
     The mounting channel  201  has a certain size, and the limiting mechanism  65  has a certain size. The size of the mounting channel  201  is larger than that of the limiting mechanism  65  so that at least a part of the limiting mechanism  65  can be accommodated in the mounting channel  201 . 
     In the present example, the limiting mechanism  65  needs to be mounted to the display screen  20 . That is, the limiting mechanism  65  and the display screen  20  are originally independent of each other. 
     The assembly method of the camera module  30  includes the following steps. The limiting mechanism  65  is mounted to the mounting channel  201  of the display screen  20 , the camera module  30  is mounted to the limiting mechanism  65 , the position of the camera module  30  is adjusted relative to the limiting mechanism  65  so as to achieve the purpose of adjusting the position of the camera module  30  relative to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are confirmed on the basis of the imaging effect of the camera module  30 , and the camera module  30  and the display screen  20  are fixed at an adjusted position by fixing the camera module  30  to the limiting mechanism  65 . 
     The limiting mechanism  65  may be limited to some extent by the size control over the mounting channel  201  of the display screen  20  to facilitate improvement of the positioning accuracy of the limiting mechanism  65  and the display screen  20 . 
     It will be understood that in the mounting process of the limiting mechanism  65  to the mounting channel  201  of the display screen  20 , the limiting mechanism  65  may be fixed to the display screen  20  based on the degree of alignment of the limiting channel  650  of the limiting mechanism  65  with the light through hole  200  of the display screen  20 . In this way, adjustment of the relative positions between the camera module  30  and the display screen  20  during subsequent adjustments only requires adjustment of the relative positions between the camera module  30  and the limiting mechanism  65 . 
     The assembly method of the camera module  30  may also be implemented as the following steps. The camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  is mounted to the mounting channel  201  of the display screen  20 , the position of the camera module  30  is adjusted relative to the limiting mechanism  65  so as to achieve the purpose of adjusting the position of the camera module  30  relative to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are confirmed on the basis of the imaging effect of the camera module  30 , and the camera module  30  and the display screen  20  are fixed at an adjusted position by fixing the camera module  30  to the limiting mechanism  65 . 
     The limiting mechanism  65  may be limited to some extent by the size control over the mounting channel  201  of the display screen  20  to facilitate improvement of the positioning accuracy of the limiting mechanism  65  and the display screen  20 . 
     It will be understood that in the mounting process of the limiting mechanism  65  to the display screen  20 , the limiting mechanism  65  may be mounted to the display screen  20  based on the imaging effect of the camera module  30 . 
     The assembly method of the camera module  30  may also be implemented as the following steps. The relative positions of the camera module  30  and the display screen  20  are adjusted to a more satisfactory position. The camera module  30  is mounted to the limiting mechanism  65  so that the camera module  30  can be fixed to the position. The limiting mechanism  65  is mounted to the mounting channel  201  of the display screen  20 , and the relative positions of the camera module  30  and the limiting mechanism  65  are then adjusted within a range of the limiting mechanism  65  where the camera module  30  may be adjusted, thereby adjusting the relative positions of the camera module  30  and the display screen  20  mechanism. 
     It will be understood that after the camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  may be fixed to the display screen  20 , so that the camera module  30  can be adjusted within a relatively small range by the limiting mechanism  65  so as to improve the adjustment accuracy of the camera module  30  and the limiting mechanism  65 . Or, after the camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  is temporarily not fixed to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are continuously changed to obtain a relatively satisfactory imaging effect, and the limiting mechanism  65  is then fixed to the display screen  20 . 
     Further, in the present example, the back side of the display screen  20  is implemented as a planar structure. That is, the drive circuit layer  26  of the display screen  20  is a planar structure, and the limiting mechanism  65  is mounted to the drive circuit layer  26  of the display screen  20 . When the relative positions between the limiting mechanism  65  and the display screen  20  need to be adjusted, the position adjustment of the limiting mechanism  65  on the display screen  20  is limited by the mounting channel  201  of the display screen  20 . 
     It will be certainly understood that the relative positions of the camera module  30  and the display screen  20  may also be adjusted directly. When the relative positions between the camera module  30  and the display screen  20  are determined, the camera module  30  may be directly fixed to the display screen  20  by means of gluing or welding, etc., and the positions of the camera module and the display screen may be maintained at the adjusted position. 
     Furthermore, after the relative positions of the limiting mechanism  65  and the camera module  30  are confirmed based on the imaging effect of the camera module  30 , the limiting mechanism  65  and the camera module  30  may be fixed by means of gluing, welding, etc. 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, the space of the limiting channel  650  of the limiting mechanism  65  not occupied by the camera module  30  may be filled with a colloid to fix the relative positions of the camera module  30  and the limiting mechanism  65 . 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, an insert piece may be inserted between the camera module  30  and the sleeve  651  of the limiting mechanism  65  to fix the relative positions of the camera module  30  and the limiting mechanism  65 . The insert piece limits the displacement of the camera module  30  relative to the limiting mechanism  65 . 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, a welding pad may be provided on the outer side of the lens barrel of the camera module  30  or the inner wall of the sleeve  651  of the limiting mechanism  65 , and the camera module  30  and the limiting mechanism  65  are then fixed by means of welding. 
     It will be understood that the colloid used for fixing the camera module  30  and the limiting mechanism  65  may be a thermoplastic fluid, and when the thermoplastic fluid fills the gap between the camera module  30  and the limiting mechanism  65 , the thermoplastic fluid of the camera module  30  and the limiting mechanism  65  may be cured by means of heating. 
     Further, the sleeve  651  of the limiting mechanism  65  is configured as an opaque material to reduce the influence of external light on the camera module  30  located in the limiting channel  650  of the limiting mechanism  65 . Especially when the display screen  20  is an LCD screen  20 , the back plate layer  27  can actively emit light, and the opaque limiting mechanism  65  can reduce the influence of the light-emitting back plate layer  27  on the camera module  30 . 
     The limiting mechanism  65  may be fixed to the drive circuit layer  26  by means of gluing, welding, etc. 
     Referring to  FIG. 55 , a specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. In the present example, the limiting mechanism  65  further includes a connecting portion  653 . The connecting portion  653  is configured to connect the sleeve  651  to the display screen  20 . 
     Specifically, the sleeve  651  has a free end  6511  and a connecting end  6512 . The free end  6511  and the connecting end  6512  are respectively located at both ends, and the connecting portion  653  is located at the connecting end  6512  of the sleeve  651 . 
     The connecting portion  653  may be configured to extend outward from the connecting end  6512  of the sleeve  651 . When the limiting mechanism  65  and the display screen  20  are mounted, the connecting portion  653  of the limiting mechanism  65  can be connected to the display screen  20 . Meanwhile, the connecting portion  653  increases the area size of the limiting mechanism  65  connectable to the display screen  20 , so as to facilitate the stable connection of the limiting mechanism  65  and the display screen  20 . Thus, it is advantageous to stably mount the camera module  30  to the display screen  20  by the limiting mechanism  65 . 
     More specifically, taking the mounting channel  201  formed on the back plate layer  27  as an example, the drive circuit layer  26  is at least exposed. The connecting portion  653  of the limiting mechanism  65  extends horizontally along the surface of the drive circuit layer  26 , and the limiting mechanism  65  and the display screen  20  may be fixed by fixing the connecting portion  653  and the drive circuit layer  26  of the display screen  20 . 
     The mounting channel  201  may be designed to be slightly larger to accommodate the connecting portion  653 . 
     It is worth mentioning that in this way, the height sizes of the display screen  20  and the camera module  30  can be reduced to facilitate the reduction of the thickness size of the terminal device. 
     Referring to  FIG. 56 , a specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. In the present example, the relative positions of the limiting mechanism  65  and the display screen  20  are fixed in advance, and it is only necessary to adjust the relative positions of the camera module  30  and the limiting mechanism  65 . 
     The limiting mechanism  65  is combined to the display screen  20  to facilitate enhancement of the combination strength of the limiting mechanism  65  to the display screen  20 . 
     In the present example, the display screen  20  has a mounting channel  201 . The light through hole  200  penetrates through the mounting channel  201 . The light through hole  200  penetrates through the layers of the display screen  20  in the height direction, and the mounting channel  201  is exposed on the back side of the display screen  20 . 
     The inner diameter of the mounting channel  201  is larger than that of the light through hole  200 . At least a part of the limiting mechanism  65  can be accommodated in the mounting channel  201 . 
     In the present example, the limiting mechanism  65  is embedded into the display screen  20 . 
     For example, when the display screen  20  is an OLED display screen  20 , the display screen  20  includes the cover plate layer  21 , the touch layer  22 , the polarization layer  23 , the encapsulation layer  24 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27 . For example, the mounting channel  201  is formed on the back plate layer  27  and at least a part of the drive circuit layer  26  is exposed on the mounting channel  201 . 
     At least a part of the limiting mechanism  65  penetrates through the mounting channel  201  and embedded into the drive circuit layer  26 . 
     The limiting mechanism  65  further includes at least one connecting pin  654 . The connecting pin  654  extends from the connecting end  6512  of the sleeve  651  along the length direction of the sleeve  651 . Preferably, there may be a plurality of connecting pins  654 . 
     The display screen  20  has at least one embedded channel  203 . The embedded channel  203  is located around the light through hole  200  of the display screen  20 , and the embedded channel  203  is matched to the connecting pin  654  of the limiting mechanism  65 . 
     The embedded channel  203  extends to the drive circuit layer  26 . Preferably, the embedded channel  203  is configured to avoid the circuit structure of the drive circuit layer  26  to reduce the influence on the working efficiency of the display screen  20 . 
     It will be certainly understood by those skilled in the art that the embedded channel  203  may continue to extend upward from the drive circuit layer  26  to other layers of the display screen  20 . 
     When the limiting mechanism  65  is mounted to the display screen  20 , the connecting pin  654  of the limiting mechanism  65  extends into the embedded channel  203  of the display screen  20 . The connecting pin  654  may be embedded into the embedded channel  203 . The embedded channel  203  may also be slightly larger than the connecting pin  654 . When the connecting pin  654  extends into the embedded channel  203 , a gap remains in the embedded channel  203 . At this moment, a colloid may be filled inward, so that the connecting pin  654  of the limiting mechanism  65  can be fixed to the embedded channel  203  of the display screen  20 , thereby facilitating the limiting mechanism  65  to be stably mounted to the display screen  20 . 
     Further, when the mounting channel  201  of the display screen  20  is slightly larger than the sleeve  651  of the limiting mechanism  65 , the limiting mechanism  65  may be fixed to a portion of the display screen  20  corresponding to the mounting channel  201 , e.g., the back plate layer  27 , by means of filling the mounting channel  201  with a colloid or mounting an insertion piece or welding. In this way, the limiting mechanism  65  and the display screen  20  can be combined firmly to facilitate stable combination between the limiting mechanism  65  and the camera module  30 . 
     Further, the embedded channel  203  may be formed on the drive circuit layer  26  of the display screen  20  by means of perforating. The drive circuit layer  26  of the display screen  20  is drilled, for example, in the mounting channel  201 . The embedded channel  203  may also be formed by means of etching. 
     It will be understood by those skilled in the art that the manner in which the embedded channel  203  is formed or the position of the embedded channel  203  is not limited to the above examples. 
     Furthermore, according to other embodiments of the present invention, the embedded channel  203  may be formed on the sleeve  651 , and the connecting pin  654  may be formed on the display screen  20 . 
     When the limiting mechanism  65  is mounted to the display screen  20 , the connecting pin  654  located on the display screen  20  extends into the embedded channel  203  of the sleeve  651 , thereby facilitating fixation between the limiting mechanism  65  and the display screen  20 . 
     The connecting pin  654  may be formed on the display screen  20  by means of deposition, evaporation, etc. The connecting pin  654  may be integrally formed on the display screen  20 . The connecting pin  654  may be formed on a portion of the drive circuit layer  26  of the display screen  20  exposed to the mounting channel  201 . 
     Furthermore, according to other embodiments of the present invention, the embedded channels  203  may be formed on the sleeve  651  and the display screen  20 , respectively, and the connecting pins  654  can be embedded into the sleeve  651  and the display screen  20 , respectively. For example, one end of the connecting pin  654  extends into the embedded channel  203  of the display screen  20 , and the other end of the connecting pin  654  then extends into the embedded channel  203  of the sleeve  651 . The connecting pin  654  and the display screen  20  and the connecting pin  654  and the sleeve  651  are respectively fixed, thereby fixing the sleeve  651  to the display screen  20 . 
     Referring to  FIG. 57 , another specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. 
     The mobile terminal includes a base plate  70 . The base plate  70  is configured to mount the camera module  30 . The camera module  30  is located between the base plate  70  and the display screen  20 . 
     A position between the base plate  70  and the display screen  20  can be relatively fixed, for example, by a housing  40  of the mobile terminal. The base plate  70  may be mounted to the mobile terminal after the camera module  30  is mounted to the mobile terminal, the housing  40  is then mounted to the mobile terminal, and the mobile terminal may provide a sufficient operating space when the camera module  30  is mounted. 
     The limiting mechanism  65  is located on the base plate  70  so as to limit the relative displacement of the camera module  30  and the display screen  20  by limiting the relative displacement of the camera module  30  and the base plate  70 . 
     In the present example, the limiting mechanism  65  needs to be mounted to the display screen  20 . That is, the limiting mechanism  65  and the base plate  70  are originally independent of each other. 
     The assembly method of the camera module  30  includes the following steps. The limiting mechanism  65  is mounted to the base plate  70 , the camera module  30  is mounted to the limiting mechanism  65 , the position of the camera module  30  is adjusted relative to the limiting mechanism  65  so as to achieve the purpose of adjusting the position of the camera module  30  relative to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are confirmed on the basis of the imaging effect of the camera module  30 , and the camera module  30  and the display screen  20  are fixed at an adjusted position by fixing the camera module  30  to the limiting mechanism  65 . It will be understood that in the mounting process of the limiting mechanism  65  to the base plate  70 , the limiting mechanism  65  may be fixed to the display screen  20  based on the degree of alignment of the limiting channel  650  of the limiting mechanism  65  with the light through hole  200  of the base plate  70 . That is, a mounting position of the limiting mechanism  65  on the base plate  70  is judged according to an alignment state of the limiting channel  650  of the limiting mechanism  65  with the light through hole  200  of the display screen  20 . In this way, adjustment of the relative positions between the camera module  30  and the display screen  20  during subsequent adjustments only requires adjustment of the relative positions between the camera module  30  and the limiting mechanism  65 . 
     The assembly method of the camera module  30  may also be implemented as the following steps. The camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  is mounted to the base plate  70 , the position of the camera module  30  is adjusted relative to the limiting mechanism  65  so as to achieve the purpose of adjusting the position of the camera module  30  relative to the display screen  20 , the relative positions of the camera module  30  and the display screen  20  are confirmed on the basis of the imaging effect of the camera module  30 , and the camera module  30  and the display screen  20  are fixed at an adjusted position by fixing the camera module  30  to the limiting mechanism  65 . 
     It will be understood that in the mounting process of the limiting mechanism  65  to the base plate  70 , the limiting mechanism  65  may be mounted to the base plate  70  based on the imaging effect of the camera module  30 . 
     The assembly method of the camera module  30  may also be implemented as the following steps. The relative positions of the camera module  30  and the display screen  20  are adjusted to a more satisfactory position. The camera module  30  is mounted to the limiting mechanism  65  so that the camera module  30  can be fixed to the position. The limiting mechanism  65  is mounted to the base plate  70 , and the relative positions of the camera module  30  and the limiting mechanism  65  are then adjusted within a range of the limiting mechanism  65  where the camera module  30  may be adjusted, thereby adjusting the relative positions of the camera module  30  and the display screen  20 . 
     It will be understood that after the camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  may be fixed to the base plate  70 , so that the camera module  30  can be adjusted within a relatively small range by the limiting mechanism  65  so as to improve the adjustment accuracy of the camera module  30  and the limiting mechanism  65 . Or, after the camera module  30  is mounted to the limiting mechanism  65 , the limiting mechanism  65  is temporarily not fixed to the base plate  70 , the relative positions of the camera module  30  and the display screen  20  are continuously changed to obtain a relatively satisfactory imaging effect, and the limiting mechanism  65  is then fixed to the base plate  70 . 
     Further, in the present example, one side of the base plate  70  is implemented as a planar structure, and the limiting mechanism  65  is mounted to the side of the base plate  70 . When the relative positions between the limiting mechanism  65  and the display screen  20  need to be adjusted, the limiting mechanism  65  is freely adjusted on the base plate  70  until the limiting channel  650  of the limiting mechanism  65  is aligned with the light through hole  200  of the display screen  20 , or the camera module  30  mounted to the limiting mechanism  65  obtains a desired imaging effect. 
     It will be certainly understood that the relative positions of the camera module  30  and the display screen  20  may also be adjusted directly. When the relative positions between the camera module  30  and the display screen  20  are determined, the camera module  30  may be directly fixed to the display screen  20  by means of gluing or welding, etc., and the positions of the camera module and the display screen may be maintained at the adjusted position. 
     Furthermore, after the relative positions of the limiting mechanism  65  and the camera module  30  are confirmed based on the imaging effect of the camera module  30 , the limiting mechanism  65  and the camera module  30  may be fixed by means of gluing, welding, etc. 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, the space of the limiting channel  650  of the limiting mechanism  65  not occupied by the camera module  30  may be filled with a colloid to fix the relative positions of the camera module  30  and the limiting mechanism  65 . 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, an insert piece may be inserted between the camera module  30  and the sleeve  651  of the limiting mechanism  65  to fix the relative positions of the camera module  30  and the limiting mechanism  65 . The insert piece limits the displacement of the camera module  30  relative to the limiting mechanism  65 . 
     For example, when the camera module  30  is mounted to the limiting mechanism  65  and the relative positions of the camera module  30  and the limiting mechanism  65  are adjusted, the limiting channel  650  of the limiting mechanism  65  has a gap for fine adjustment between the camera module  30  and the limiting mechanism  65 . 
     When the relative positions between the camera module  30  and the limiting mechanism  65  are confirmed, a welding pad may be provided on the outer side of the lens barrel of the camera module  30  or the inner wall of the sleeve  651  of the limiting mechanism  65 , and the camera module  30  and the limiting mechanism  65  are then fixed by means of welding. 
     It will be understood that the colloid used for fixing the camera module  30  and the limiting mechanism  65  may be a thermoplastic fluid, and when the thermoplastic fluid fills the gap between the camera module  30  and the limiting mechanism  65 , the thermoplastic fluid of the camera module  30  and the limiting mechanism  65  may be cured by means of heating. 
     Further, the sleeve  651  of the limiting mechanism  65  is configured as an opaque material to reduce the influence of external light on the camera module  30  located in the limiting channel  650  of the limiting mechanism  65 . Especially when the display screen  20  is an LCD screen  20 , the back plate layer can actively emit light, and the opaque limiting mechanism  65  can reduce the influence of the light-emitting back plate layer on the camera module  30 . 
     It is worth noting that the camera module  30  has a high end and a low end. When the limiting mechanism  65  is located on the display screen  20 , the high end of the camera module  30  is mounted to the limiting mechanism  65 . The high end of the camera module  30  is a light entering position of the camera module  30 , and the low end of the camera module  30  is a photosensitive position of the camera module  30 . When the limiting mechanism  65  is located on the base plate  70 , the bottom end of the camera module  30  is mounted to the limiting mechanism  65 . 
     In the present embodiment, the lower end of the camera module  30  is mounted to the limiting mechanism  65 . When the relative positions of the camera module  30  and the limiting mechanism  65  are determined, that is, when the relative positions of the camera module  30  and the display screen  20  are determined, the high end of the camera module  30  may be mounted to the display screen  20 . 
     Referring to  FIG. 58 , a specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. In the present example, the limiting mechanism  65  further includes a connecting portion  653 . The connecting portion  653  is configured to connect the sleeve  651  to the base plate  70 . 
     Specifically, the sleeve  651  has a free end  6511  and a connecting end  6512 . The free end  6511  and the connecting end  6512  are respectively located at both ends, and the connecting portion  653  is located at the connecting end  6512  of the sleeve  651 . 
     The connecting portion  653  may be configured to extend outward from the connecting end  6512  of the sleeve  651 . When the limiting mechanism  65  and the base plate  70  are mounted, the connecting portion  653  of the limiting mechanism  65  can be connected to the base plate  70 . Meanwhile, the connecting portion  653  increases the area size of the limiting mechanism  65  connectable to the base plate  70 , so as to facilitate the stable connection of the limiting mechanism  65  and the base plate  70 . Thus, it is advantageous to stably mount the camera module  30  to the display screen  20  by the limiting mechanism  65 . 
     Referring to  FIG. 59 , a specific implementation mode of the limiting mechanism  65  according to the present invention is illustrated. In the present example, the relative positions of the limiting mechanism  65  and the base plate  70  are fixed in advance, and it is only necessary to adjust the relative positions of the camera module  30  and the limiting mechanism  65 . 
     The limiting mechanism  65  is combined to the base plate  70  to facilitate enhancement of the combination strength of the limiting mechanism  65  to the base plate  70 . 
     In the present example, the limiting mechanism  65  is embedded into the base plate  70 . 
     The limiting mechanism  65  further includes at least one connecting pin  654 . The connecting pin  654  extends from the connecting end  6512  of the sleeve  651  along the height direction of the sleeve  651 . Preferably, there may be a plurality of connecting pins  654 . 
     The base plate  70  has at least one embedded channel  203 . The embedded channel  203  is located around the light through hole  200  of the display screen  20 , and the embedded channel  203  is matched to the connecting pin  654  of the limiting mechanism  65 . 
     Preferably, the embedded channel  203  is configured to avoid a circuit structure of the base plate  70  to reduce the influence on the working efficiency of the base plate  70 . 
     When the limiting mechanism  65  is mounted to the base plate  70 , the connecting pin  654  of the limiting mechanism  65  extends into the embedded channel  203  of the base plate  70 . The connecting pin  654  may be embedded into the embedded channel  203 . The embedded channel  203  may also be slightly larger than the connecting pin  654 . When the connecting pin  654  extends into the embedded channel  203 , a gap remains in the embedded channel  203 . At this moment, a colloid may be filled inward, so that the connecting pin  654  of the limiting mechanism  65  can be fixed to the embedded channel  203  of the base plate  70 , thereby facilitating the limiting mechanism  65  to be stably mounted to the base plate  70 . 
     Further, the embedded channel  203  may be formed on the base plate  70  by means of perforating. For example, the embedded channel is formed by drilling inward from the surface of the base plate  70 . 
     It will be understood by those skilled in the art that the manner in which the embedded channel  203  is formed or the position of the embedded channel  203  is not limited to the above examples. 
     Furthermore, according to other embodiments of the present invention, the embedded channel  203  may be formed on the sleeve  651 , and the connecting pin  654  may be formed on the base plate  70 . 
     When the limiting mechanism  65  is mounted to the base plate  70 , the connecting pin  654  located on the base plate  70  extends into the embedded channel  203  of the sleeve  651 , thereby facilitating fixation between the limiting mechanism  65  and the base plate  70 . 
     The connecting pin  654  may be formed on the base plate  70  by means of deposition, evaporation, etc. The connecting pin  654  may be integrally formed on the base plate  70 . 
     Furthermore, according to other embodiments of the present invention, the embedded channels  203  may be formed on the sleeve  651  and the base plate  70 , respectively, and the connecting pins  654  can be embedded into the sleeve  651  and the base plate  70 , respectively. For example, one end of the connecting pin  654  extends into the embedded channel  203  of the base plate  70 , and the other end of the connecting pin  654  then extends into the embedded channel  203  of the sleeve  651 . The connecting pin  654  and the base plate  70  and the connecting pin  654  and the sleeve  651  are respectively fixed, thereby fixing the sleeve  651  to the base plate  70 . 
     Furthermore, in other embodiments of the present invention, the base plate  70  may have at least one mounting channel  201 . The base plate  70  is recessed to form the mounting channel  201 . At least a part of the limiting mechanism  65  may be accommodated in the mounting channel  201 , and the base plate  70  and the limiting mechanism  65  may be then fixed by filling the gap between the base plate  70  and the limiting mechanism  65  with a colloid. 
     In order to reduce the requirements for the assembly accuracy of the camera module  30  and the display screen  20 , a lens barrel of the camera module  30  is preferably specially designed. Referring to  FIGS. 60A, 60B, and 28 , the camera module  30  includes an optical mechanism  31 A′ and a photosensitive unit  32 A. The optical mechanism  31 A′ includes an optical lens  311 A′. The optical lens  311 A′ is held in a photosensitive path of the photosensitive unit  32 A. 
     The optical mechanism  31 A′ may also include components such as a motor, a base, and a filter element. 
     The optical lens  311 A′ includes the lens barrel  3111 A′ and a plurality of lenses. The plurality of lenses are held on the lens barrel  3111 A′. 
     The lens barrel  3111 A′ has an end face. When the camera module  30  is mounted to the display screen  20 , the end face of the lens barrel  3111 A′ is adapted to be close to the display screen  20  and then fixed to the display screen  20 . 
     One of the lenses is a first lens  3112 A′. The first lens  3112 A′ is generally closest to the end face of the lens barrel  3111 A′ relative to the other lenses. 
     In the present example, the first lens  3112 A′ and the end face of the lens barrel  3111 A′ are provided at a large distance. 
     Specifically, the lens barrel  3111 A′ includes a lens barrel wall  31111 A′ and a lens barrel cavity  31110 A′. The lens  3112 A′ is accommodated in the lens barrel cavity  31110 A′. The lens barrel wall  31111 A′ surrounds the lens barrel cavity  31110 A′. 
     The lens barrel  3111 A′ further includes an extension wall  31112 A′. The extension wall  31112 A′ extends vertically upward from one end of the lens barrel wall  31111 A′. The lens barrel wall  31111 A′ has a high end and a low end. The extension wall  31112 A′ extends for a certain distance upward from the high end of the lens barrel wall  31111 A′ to increase the distance between the first lens  3112 A′ and the end face of the lens barrel  3111 A′. 
     The camera module  30  can be assembled directly to the display screen  20  and avoids the influence on the first lens  3112 A′. 
     In this way, the requirements for assembly accuracy between the camera module  30  and the display screen  20  can be reduced. The camera module  30  may be supported directly on the display screen  20  and the relative positions between the camera module  30  and the display screen  20  are then adjusted. 
     Further, in the example shown in  FIG. 60A , the extension wall  31112 A′ is provided so as to extend horizontally inward after extending for a certain distance from the lens barrel wall  31111 A′. In the example shown in  FIG. 60B , the extension wall  31112 A″ may extend all the way upward from the lens barrel wall  31111 A′. 
     Referring to  FIG. 60C , another implementation mode of the optical mechanism  31 A′ according to the above embodiment of the present invention is shown. In the present embodiment, the extension wall  31112 A′ extends upward for a certain distance from the high end of the lens barrel wall  31111 A′, and the inner diameter of the extension wall  31112 A′ is set to be gradually reduced from top to bottom. As it is closer to the high end of the lens barrel wall  31111 A′, the inner diameter of the extension wall  31112 A′ is smaller. That is, as it is closer to the high end of the lens barrel wall  31111 A′, the lens barrel cavity  31110 A′ is smaller. Meanwhile, the outer diameter of the extension wall  31112 A′ is also set to be gradually reduced from top to bottom. 
     Referring to  FIG. 60D , another implementation mode of the optical mechanism  31 A′ according to the above embodiment of the present invention is shown. In the present embodiment, the extension wall  31112 A′ extends upward for a certain distance from the high end of the lens barrel wall  31111 A′, and the inner diameter of the extension wall  31112 A′ is set to remain constant from top to bottom. However, the outer diameter of the extension wall  31112 A′ is set to be gradually reduced from top to bottom. As it is closer to the high end of the lens barrel wall  31111 A′, the outer diameter of the extension wall  31112 A′ is smaller. 
     Referring to  FIG. 60E , another implementation mode of the optical mechanism  31 A′ according to the above embodiment of the present invention is shown. In the present embodiment, the extension wall  31112 A′ extends upward for a certain distance from the high end of the lens barrel wall  31111 A′, and the inner diameter of the extension wall  31112 A′ is set to be gradually increased from top to bottom. Also, the outer diameter of the extension wall  31112 A′ is set to be gradually increased from top to bottom. As it is closer to the high end of the lens barrel wall  31111 A′, both the inner and outer diameters of the extension wall  31112 A′ are increased. 
     Further, for the display screen  20  with the light through hole  200 , an edge of the light through hole  200 , i.e., a transition region between a display screen and a non-display region of the display screen  20 , may have a black edge due to the presence of the light through hole  200 , thereby influencing the normal display of the entire display screen  20 . The light through hole  200  penetrates through at least a part of the display screen  20 , e.g., a pixel layer of the display screen  20 , in the height direction. 
     According to another aspect of the present invention, referring to  FIGS. 61A to 61C , a terminal device  1  is provided according to the present invention. The terminal device  1  includes a terminal device body  10 , a display unit, and a camera module  30 . The camera module  30  is located below the display unit. The camera module  30  has a front end. The front end of the camera module  30  is mounted to a display screen  20  of the display unit and the camera module  30  is aligned with a light through hole  200  of the display screen  20 , so that light outside the display screen  20  is received by the camera module  30  via the light through hole  200 . 
     The display unit includes the display screen  20  with the light through hole  200  and a light supplementing unit  80 . The light supplementing unit  80  can supplement light to the position of the light through hole  200  of the display screen  20  to facilitate a display effect of the entire display screen  20 . 
     In the present implementation, the light supplementing unit  80  is located between the display screen  20  and the camera module  30 , and may be mounted to a bottom surface of the display screen  20 . Light from the outside of the display screen  20  passes through the light through hole  200  of the display screen  20  and the light supplementing unit  80 , and then reaches the camera module  30 . 
     Further, in the present example, the display screen  20  is exemplified as an OLED display screen, and the light through hole  200  penetrates through the layers of the display screen other than the cover plate layer  21 . It will be certainly understood by those skilled in the art that the type of display screen  20  is not limited to OLED display screens and that the position of the light through hole  200  inside the display screen  20  may not be limited to the above examples. 
     The light supplementing unit  80  can not only supplement light to the light through hole  200  of the display screen  20 , but also control the light entering amount of the camera module  30 . 
     Specifically, the light supplementing unit  80  includes a diaphragm structure  81  and a light emitting structure  82 . The light emitting structure  82  is provided to the diaphragm structure  81 . 
     The light emitting structure  82  can radiate light outward, and at least a part of the diaphragm structure  81  is located on the light through hole  200  or aligned with the light through hole  200 . At least a part of the light emitting structure  82  provided to the diaphragm structure  81  is configured so as to be able to be located at the light through hole  200  or near the light through hole  200  or to be aligned with the light through hole  200 . Therefore, when the light emitting structure  82  emits light, the problem of insufficient illumination of the display region and the non-display region of the display screen  20  corresponding to the position of the light through hole  200  can be compensated. 
     The diaphragm structure  81  includes a diaphragm moving portion  811 , a diaphragm carrier  812 , and a diaphragm driving portion  813 . The diaphragm moving portion  811  is supported on the diaphragm carrier  812 , and the diaphragm moving portion  811  is drivable connected to the diaphragm driving portion  813 . The diaphragm moving portion  811  can move under the action of the diaphragm driving portion  813  to form a light hole  810  of a variable size. 
     Specifically, the diaphragm moving portion  811  moves under the drive of the diaphragm driving portion  813 , and the size of an optical path corresponding to the camera module  30  can be changed as the relative positions of the diaphragm moving portion  811  and the light through hole are changed. 
     The light emitting structure  82  is provided to the diaphragm moving portion  811 . Specifically, the diaphragm moving portion  811  has an upper surface facing the outside of the display screen  20  and a lower surface facing the camera module  30 . The light emitting structure  82  is located on the upper surface of the diaphragm moving portion  811  so as to supplement light to a side of the display screen  20  facing the outside when the light emitting structure  82  emits light. 
     The entire diaphragm moving portion  811  may be opaque. When the light emitting structure  82  emits light, it is difficult for light emitted by the light emitting structure  82  to reach the camera module  30  located below the display screen  20 . When the camera module  30  operates, the amount of light entering through the diaphragm moving portion  811  may be controlled based on the size of the light hole  810 . 
     The entire diaphragm moving portion  811  may also be light-transmitting, but the lower surface of the diaphragm moving portion  811  may be provided with an opaque material. When the light emitting structure  82  emits light, it is difficult for light emitted by the light emitting structure  82  to reach the camera module  30  located below the display screen  20 . When the camera module  30  operates, the amount of light entering through the diaphragm moving portion  811  may be controlled based on the size of the light hole  810 . 
     After passing through the light through hole  200  of the display screen  20 , the light passes through the light hole  810  of the diaphragm structure  81  and is received by the camera module  30 . The light hole  810  of the diaphragm structure  81  is aligned with the through hole  200  of the display screen  20 . Further, the light hole  810  of the diaphragm structure  81  and the light through hole  200  of the display screen  20  may be located on the same axis. 
     The light emitting structure  82  includes at least one light emitting element  821 . The light emitting element  821  is arranged on the upper surface of the diaphragm moving portion  811  of the diaphragm structure  81 . The light emitting element  821  may be one pixel or more pixels. When one of the light emitting elements  821  is energized, the light emitting element  821  emits light. When the plurality of light emitting elements  821  are energized, the illumination amplitude of the light emitting structure  82  is enhanced. The luminance of the light emitting structure  82  may be controlled by controlling the magnitude of an energizing current of the light emitting element  821 . 
     When the camera module  30  needs to operate, the diaphragm moving portion  811  may move under the drive of the diaphragm driving portion  813  to form the light hole  810  or enlarge the light hole  810 . At this moment, the diaphragm moving portion  811  may stop emitting light. 
     When the camera module  30  does not operate and the display screen  20  plays a display role, the diaphragm moving portion  811  is driven by the diaphragm driving portion  813  so that at least a part of the light emitting structure  82  corresponds to the light through hole  200 . Thus, the light emitting structure  82  can radiate light outward via the light through hole  200 . At this moment, the light hole  810  of the diaphragm structure  81  may be completely closed, or the light hole  810  of the diaphragm structure  81  may be opened, light may reach the camera module  30 , and the camera module  30  may be started at any time to operate. 
     Further, the light supplementing unit  80  is detachably mounted to the display screen  20  to facilitate maintenance and replacement of the light supplementing unit  80 . 
     The light supplementing unit  80  includes a control mechanism  83 . The diaphragm structure  81  is controllably connected to the control mechanism  83 . The control mechanism  83  may control the size of the light hole  810  of the diaphragm structure  81  by controlling the diaphragm driving portion  813  to control the movement of the diaphragm moving portion  811  of the diaphragm structure  81 . The control mechanism  83  may also control an operating state of the light emitting structure  82 , such as a light emitting intensity and an on/off state. The control mechanism  83  may be implemented as a control chip of the terminal device, such as a control chip of the camera module  30 . 
     According to another aspect of the present invention, an operating method of a display unit is provided by the present invention. The operating method includes the following steps. 
     When the display screen  20  with the light through hole  200  operates, the light supplementing unit  80  is operated to emit light so as to supplement the light intensity of the position of the light through hole  200 . 
     According to some embodiments of the present invention, when the camera module  30  located below the display screen  20  and aligned with the light through hole  200  operates, the diaphragm structure  81  of the light supplementing unit  80  located above the camera module  30  is operated to form the light hole  810 . Light reaches the camera module  30  after being constrained by the light hole  810  and the light supplementing unit  80 . 
     Referring to  FIGS. 62A, 62C, and 61A-61C , another implementation mode of the terminal device  1  according to the above embodiment of the present invention is shown. 
     In the present example, the diaphragm moving portion  811  includes a plurality of blades  8111 . Each blade  8111  is supported on the diaphragm carrier  812  and the distances between the plurality of blades  8111  can be changed with each other under the drive of the diaphragm driving portion  813 , so that light can pass through the diaphragm structure  81 , and the light through amount can also be controlled. 
     The light emitting structure  82  includes the plurality of light emitting elements  821 , and each of the light emitting elements  821  corresponds to one of the blades  8111  of the diaphragm moving portion  811 . 
     Each blade  8111  may be drivable connected to the diaphragm driving portion  813 , respectively. All the blades  8111  may be drivable connected to the diaphragm driving portion  813 , simultaneously. 
     The position of the light emitting element  821  can move as the blade  8111  moves. Referring to  FIGS. 62A to 62C , as the blade  8111  moves, the aperture size of the light hole  810  of the diaphragm structure  81  of the light supplementing unit  80  can be adjusted, and the light hole  810  can be enlarged or reduced to control the light entering amount of the camera module  30 . 
     According to other embodiments of the present invention, the diaphragm moving portion  811  includes a plurality of blades  8111 , and the plurality of light emitting elements  821  are provided to one of the blades  8111 . Each blade  8111  is provided with the plurality of light emitting elements  821 . 
     The light emitting element  821  may be one of the pixels, and the entire diaphragm moving portion  811  may be used as a display portion of the display screen  20 . Especially when the blades  8111  of the diaphragm moving portion  811  are folded to close the light hole  810 , the position of the light through hole  200  of the display screen  20  appears to be integrated with the display region of the display screen  20 . 
     Referring to  FIG. 63 , another implementation mode of the display unit according to the above preferred embodiment of the present invention is shown. 
     In the present example, the light supplementing unit  80  includes the diaphragm structure  81  and the light emitting structure  82 , and further includes a reflecting structure  84 . The reflecting structure  84  is provided to the diaphragm moving portion  811  of the diaphragm structure  81  and located between the light emitting structure  82  and the diaphragm moving portion  811 . 
     When the light emitting structure  82  emits light, a part of the light emitted by the light emitting structure  82  is radiated outward to the outside of the display screen  20 , a part of the light is radiated inward to the reflecting structure  84 , and the reflecting structure  84  can radiate the light toward the outside of the display screen  20 . 
     Further, the reflectivity of the reflecting structure  84  may change. For example, the reflecting structure  84  is implemented as a reflecting film, and is provided to the upper surface of the diaphragm moving portion  811 . 
     The reflecting film may be a highly elastic film doped with a substance having a reflecting function or plated with a reflecting layer. When the reflecting film is stretched, the reflectivity of the reflecting film is reduced and the light transmittance of the reflecting film is increased. When the reflecting film is reduced in stretching deformation, the reflectivity of the reflecting film is increased and the light transmittance is reduced. 
     One end of the highly elastic reflecting film may be fixed to the diaphragm carrier  812  of the diaphragm structure  81 , and the other end may be fixed to a side of the diaphragm moving portion  811  of the diaphragm structure  81  close to the light hole  810 . When the light hole  810  of the diaphragm moving portion  811  is gradually reduced, the highly elastic reflecting film is stretched, so that the reflectivity is reduced. When the light hole  810  of the diaphragm moving portion  811  is gradually enlarged, the highly elastic reflecting film is stretched and reduced, so that the reflectivity is increased. 
     The control of the luminance and color of the light supplementing unit  80  is achieved by controlling the aperture size of the light hole  810  of the diaphragm structure  81 . 
     Referring to  FIG. 64 , another implementation mode of the display unit according to the above preferred embodiment of the present invention is shown. 
     In the present example, the light supplementing unit  80  includes one of the diaphragm structures  81 , and the diaphragm structure  81  is capable of emitting light. The diaphragm structure  81  may be made of a light emitting material, and may radiate light outward in the case of energization. 
     The diaphragm structure  81  may be an OLED structure capable of emitting light and displaying when energized. When the camera module  30  operates, the diaphragm structure  81  may be de-energized, and the aperture of the light hole  810  may be controlled by controlling the position of the diaphragm moving portion  811  of the diaphragm structure  81 . When the camera module  30  does not operate, the diaphragm structure  81  may be energized and then emit light and play a display role to facilitate the display effect of the entire display screen  20 . 
     Referring to  FIG. 65 , another implementation mode of the display unit according to the present invention is shown. 
     In the present example, the display unit includes a display screen  20  and a light supplementing unit  80 . The display screen  20  includes, from top to bottom, a cover plate layer  21 , an encapsulation layer  22 , a touch layer  23 , a polarization layer  24 , a pixel layer  25 , a drive circuit layer  26 , and a back plate layer  27 . The drive circuit layer  26  is formed on a bottom side of the pixel layer  25  and electrically connected to the pixel layer  25  so as to drive the pixel layer  25  to operate. The encapsulation layer  22  is formed on a top side of the pixel layer  25  for encapsulating the pixel layer  25 . The light through hole  200  penetrates through the touch layer  23 , the polarization layer  24 , the encapsulation layer  22 , the pixel layer  25 , the drive circuit layer  26 , and the back plate layer  27  in a height direction. The back plate layer  27  is located on the bottommost layer. 
     The display screen  20  is an OLED screen and the light supplementing unit  80  is located inside the display screen  20 . 
     Specifically, the light supplementing unit  80  is located on the drive circuit layer  26  below the pixel layer  25 . The light supplementing unit  80  is mounted to the drive circuit layer  26  and a diaphragm structure  81  of the light supplementing unit  80  is aligned with the light through hole  200  of the display screen  20 . The drive circuit layer  26  includes a plurality of TFT structures  261  and a substrate base  262 . The TFT structures  261  are provided to the substrate base  262 . Preferably, the light supplementing unit  80  is provided between the adjacent TFT structures  261 . 
     Light outside the display screen  20  needs to pass through the diaphragm structure  81  before reaching the position of the camera module  30  located below the display screen  20 . 
     The light supplementing unit  80  includes the diaphragm structure  81  and a light emitting structure  82 . The light emitting structure  82  is provided to at least a part of the diaphragm structure  81  so as to radiate light outward, in particular, radiate light toward the outside of the display screen  20 , thereby facilitating the display effect of the position of the light through hole  200  of the display screen  20 . 
     It is worth mentioning that the light emitting intensity of the light emitting structure  82  may be controlled based on requirements, and the light emitting structure  82  can be matched with the display requirements of different display regions of the display screen  20 , so that the overall display effect of the entire display screen  20  can achieve a natural transition effect. 
     The diaphragm structure  81  includes a diaphragm moving portion  811 , a diaphragm carrier  812 , and a diaphragm driving portion  813 . The diaphragm moving portion  811  is provided to the diaphragm carrier  812 . The diaphragm moving portion  811  is drivable connected to the diaphragm driving portion  813 . 
     The diaphragm structure  81  is capable of forming a light hole  810 , and light can pass through the light hole  810 . Further, the light hole  810  is formed in the diaphragm moving portion  811  and the aperture size of the light hole  810  may be adjusted as the diaphragm moving portion  811  is driven by the diaphragm driving portion  813 . 
     The light emitting structure  82  is provided to the diaphragm moving portion  811 . Preferably, the light emitting structure  82  is provided to the upper surface of the diaphragm moving portion  811 . When the display screen  20  needs to display, the light emitting structure  82  may emit light so as to supplement light around the light through hole  200  of the display screen  20 . When the camera module  30  operates, the light emitting structure  82  may stop emitting light, and the size of the light hole  810  of the diaphragm structure  81  may be adjusted to control the amount of light entering the camera module  30 . 
     In the present embodiment, the diaphragm moving portion  811  includes a plurality of blades  8111 , and the light emitting structure  82  is provided to the blades  8111  of the diaphragm moving portion  811 . The blades  8111  may be drivable connected to the diaphragm driving portion  813 . 
     According to other embodiments of the present invention, the diaphragm moving portion  811  of the diaphragm structure  81  is made of a light emitting material and capable of emitting light. 
     According to other embodiments of the present invention, the light emitting structure  82  may be covered, embedded, and at least partially embedded on the upper surface of the diaphragm moving portion  811  of the diaphragm structure  81 . 
     According to other embodiments of the present invention, the diaphragm moving portion  811  of the diaphragm structure  81  may be fully transparent and the lower surface of the diaphragm moving portion  811  of the diaphragm structure  81  may be provided with a light-shielding material. The diaphragm structure  81  may also be at least partially light-transmitting. The light emitting structure  82  may be embedded in the diaphragm moving portion  811  of the diaphragm structure  81  and light is radiated outward by a light transmitting portion of the diaphragm moving portion  811 . 
     Referring to  FIG. 66 , another implementation mode of the display unit according to the present invention is shown. 
     In the present example, the display unit includes a display screen  20  and a light supplementing unit  80 . The display screen  20  includes, from top to bottom, a cover plate layer  21 , an encapsulation layer  22 , a touch layer  23 , a polarization layer  24 , a pixel layer  25 , a drive circuit layer  26 , and a back plate layer  27 . The drive circuit layer  26  is formed on a bottom side of the pixel layer  25  and electrically connected to the pixel layer  25  so as to drive the pixel layer  25  to operate. The encapsulation layer  22  is formed on a top side of the pixel layer  25  for encapsulating the pixel layer  25 . The light through hole  200  penetrates through the touch layer  23 , the polarization layer  24 , the encapsulation layer  22 , the pixel layer  25 , and the drive circuit layer  26  in a height direction. The back plate layer  27  is located on the bottommost layer. 
     The display screen  20  is an OLED screen and the light supplementing unit  80  is located inside the display screen  20 . 
     Specifically, the light supplementing unit  80  is located on the back plate layer  27  below the pixel layer  25 . The light supplementing unit  80  is mounted to the back plate layer  27  and a diaphragm structure  81  of the light supplementing unit  80  is aligned with the light through hole  200  of the display screen  20 . The diaphragm structure  81  of the light supplementing unit  80  may be mounted to the back plate layer  27  by first perforating the back plate layer  27 . 
     Light outside the display screen  20  needs to pass through the diaphragm structure  81  before reaching the position of the camera module  30  located below the display screen  20 . The display screen  20  has a mounting channel  201 . The mounting channel  201  is formed on the back plate layer  27  of the display screen  20  for accommodating at least a part of the camera module  30 . 
     The light supplementing unit  80  includes the diaphragm structure  81  and a light emitting structure  82 . The light emitting structure  82  is provided to at least a part of the diaphragm structure  81  so as to radiate light outward, in particular, radiate light toward the outside of the display screen  20 , thereby facilitating the display effect of the position of the light through hole  200  of the display screen  20 . 
     It is worth mentioning that the light emitting intensity of the light emitting structure  82  may be controlled based on requirements, and the light emitting structure  82  can be matched with the display requirements of different display regions of the display screen  20 , so that the overall display effect of the entire display screen  20  can achieve a natural transition effect. 
     The diaphragm structure  81  includes a diaphragm moving portion  811 , a diaphragm carrier  812 , and a diaphragm driving portion  813 . The diaphragm moving portion  811  is provided to the diaphragm carrier  812 . The diaphragm moving portion  811  is drivable connected to the diaphragm driving portion  813 . 
     The diaphragm structure  81  is capable of forming a light hole  810 , and light can pass through the light hole  810 . Further, the light hole  810  is formed in the diaphragm moving portion  811  and the aperture size of the light hole  810  may be adjusted as the diaphragm moving portion  811  is driven by the diaphragm driving portion  813 . 
     The light emitting structure  82  is provided to the diaphragm moving portion  811 . Preferably, the light emitting structure  82  is provided to the upper surface of the diaphragm moving portion  811 . When the display screen  20  needs to display, the light emitting structure  82  may emit light so as to supplement light around the light through hole  200  of the display screen  20 . When the camera module  30  operates, the light emitting structure  82  may stop emitting light, and the size of the light hole  810  of the diaphragm structure  81  may be adjusted to control the amount of light entering the camera module  30 . 
     In the present embodiment, the diaphragm moving portion  811  includes a plurality of blades  8111 , and the light emitting structure  82  is provided to the blades  8111  of the diaphragm moving portion  811 . The blades  8111  may be drivable connected to the diaphragm driving portion  813 . 
     Referring to  FIG. 67 , another implementation mode of the display unit according to the present invention is shown. 
     In the present embodiment, the display screen  20 A is an LCD screen. The light supplementing unit  80 A is located between the display screen  20 A and the camera module  30 A. For example, the light supplementing unit  80 A is mounted to the bottom surface of the display screen  20 A. 
     The light hole  810 A of the diaphragm structure  81 A of the light supplementing unit  80 A can be aligned with the light through hole  200 A and can be aligned with a photosensitive path of the camera module  30 A. 
     The display unit includes the display screen  20 A and the light supplementing unit  80 A. The display screen  20 A includes, from top to bottom, a cover plate layer  21 , an encapsulation layer  22 A, a touch layer  23 A, a polarization layer  24 A, a pixel layer  25 A, a drive circuit layer  26 A, and a back plate layer  27 A. The drive circuit layer  26 A is formed on a bottom side of the pixel layer  25 A and electrically connected to the pixel layer  25 A so as to drive the pixel layer  25 A to operate. The encapsulation layer  22 A is formed on a top side of the pixel layer  25 A for encapsulating the pixel layer  25 A. The light through hole  200 A penetrates through the touch layer  23 A, the polarization layer  24 A, the encapsulation layer  22 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A in a height direction. The back plate layer  27 A is located on the bottommost layer. The pixel layer  25 A includes a filter layer  251 A and a liquid crystal  252 A. The liquid crystal  252 A is located between the filter layer  251 A and the drive circuit layer  26 A. 
     The light through hole  200 A penetrates through the touch layer  23 A, the polarization layer  24 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A of the display screen  20 A other than the cover plate layer  21 A in the height direction. 
     The entire diaphragm moving portion  811 A may be opaque. When the light emitting structure  82 A emits light, it is difficult for light emitted by the light emitting structure  82 A to reach the camera module  30 A located below the display screen  20 A. When the camera module  30 A operates, the amount of light entering the position of the diaphragm moving portion  811 A may be controlled based on the size of the light hole  810 A. 
     The entire diaphragm moving portion  811 A may also be light-transmitting, but the lower surface of the diaphragm moving portion  811 A may be provided with an opaque material. When the light emitting structure  82 A emits light, it is difficult for light emitted by the light emitting structure  82 A to reach the camera module  30 A located below the display screen  20 A. When the camera module  30 A operates, the amount of light entering the position of the diaphragm moving portion  811 A may be controlled based on the size of the light hole  810 A. 
     After passing through the light through hole  200 A of the display screen  20 A, the light passes through the light hole  810 A of the diaphragm structure  81 A and is received by the camera module  30 A. 
     The light hole  810 A of the diaphragm structure  81 A is aligned with the light through hole  200 A of the display screen  20 A. Further, the light hole  810 A of the diaphragm structure  81 A and the light through hole  200 A of the display screen  20 A may be located on the same axis. 
     The light emitting structure  82 A includes at least one light emitting element  821 A. The light emitting element  821 A is arranged on the upper surface of the diaphragm moving portion  811 A of the diaphragm structure  81 A. The light emitting element  821 A may be one pixel or more pixels. When one of the light emitting elements  821 A is energized, the light emitting element  821 A emits light. When the plurality of light emitting elements  821 A are energized, the illumination amplitude of the light emitting structure  82 A is enhanced. The luminance of the light emitting structure  82 A may be controlled by controlling the magnitude of an energizing current of the light emitting element  821 A, so as to meet the requirements for the display luminance at different positions around the through hole. 
     The light emitting intensity of the light emitting structure  82  may be controlled based on requirements, and the light emitting structure  82  can be matched with the display requirements of different display regions of the display screen  20 , so that the overall display effect of the entire display screen  20  can achieve a natural transition effect. 
     When the camera module  30 A needs to operate, the diaphragm moving portion  811 A may move under the drive of the diaphragm driving portion  813 A to form the light hole  810 A or enlarge the light hole  810 A. At this moment, the diaphragm moving portion  811 A may stop emitting light. 
     When the camera module  30 A does not operate and the display screen  20 A serves as a display screen  20 A, the diaphragm moving portion  811 A is driven by the diaphragm moving portion  811 A so that at least a part of the light emitting structure  82 A corresponds to the light through hole  200 A. Thus, the light emitting structure  82 A can radiate light outward via the light through hole  200 A. At this moment, the light hole  810 A of the diaphragm structure  81 A may be completely closed, or the light hole  810 A of the diaphragm structure  81  may be opened, light may reach the camera module  30 A, and the camera module  30 A may be started at any time to operate. 
     Further, the light supplementing unit  80 A is detachably mounted to the display screen  20 A to facilitate maintenance and replacement of the light supplementing unit  80 A. 
     The light supplementing unit  80 A includes a control mechanism  83 A. The diaphragm structure  81 A is controllably connected to the control mechanism  83 A. The control structure may control the size of the light hole  810 A of the diaphragm structure  81 A by controlling the diaphragm driving portion  813 A to control the movement of the diaphragm moving portion  811 A of the diaphragm structure  81 A. The control structure may also control a working state of the light emitting structure  82 A, such as a light emitting intensity and an on/off state. 
     According to some embodiments of the present invention, for example, referring to  FIG. 62 , the diaphragm moving portion  811 A includes a plurality of blades  8111 A. Each blade  8111 A is supported on the diaphragm carrier  812 A and the distances between the plurality of blades  8111 A can be changed with each other under the drive of the diaphragm driver  813 A, so that light can pass through the diaphragm structure  81 A, and the light through amount can also be controlled. 
     The light emitting structure  82 A includes the plurality of light emitting elements  821 A, and each of the light emitting elements  821 A corresponds to one of the blades  8111 A of the diaphragm moving portion  811 A. 
     Each blade  8111 A may be drivable connected to the diaphragm driver  813 A, respectively. All the blades  8111 A may be drivable connected to the diaphragm driver  813 A, simultaneously. 
     The position of the light emitting element  821 A can move as the blade  8111 A moves. 
     According to some embodiments of the present invention, for example, referring to  FIG. 62 , the diaphragm moving portion  811 A includes a plurality of blades  8111 A, and the plurality of light emitting elements  821 A are provided to one of the blades  8111 A. Each blade  8111 A is provided with the plurality of light emitting elements  821 A. 
     The light emitting element  821 A may be one of the pixels, and the entire diaphragm moving portion  811 A may be used as a display portion of the display screen  20 A. Especially when the blades  8111 A of the diaphragm moving portion  811 A are folded to close the light hole  810 A, the position of the light through hole  200 A of the display screen  20 A appears to be integrated with the display region of the display screen  20 A. 
     Referring to  FIG. 68 , another implementation mode of the display unit according to the above preferred embodiment of the present invention is shown. 
     In the present example, the light supplementing unit  80 A includes the diaphragm structure  81 A and the light emitting structure  82 A, and further includes a reflecting structure  84 A. The reflecting structure  84 A is provided to the diaphragm moving portion  811 A of the diaphragm structure  81 A and located between the light emitting structure  82 A and the diaphragm moving portion  811 A. 
     When the light emitting structure  82 A emits light, a part of the light emitted by the light emitting structure  82 A is radiated outward to the outside of the display screen  20 A, a part of the light is radiated inward to the reflecting structure  84 A, and the reflecting structure  84 A can radiate the light toward the outside of the display screen  20 A. 
     Further, the reflectivity of the reflecting structure  84 A may change. For example, the reflecting structure  84 A is implemented as a reflecting film, and is provided to the upper surface of the diaphragm moving portion  811 A. 
     The reflecting film may be a highly elastic film doped with a substance having a reflecting function or plated with a reflecting layer. When the reflecting film is stretched, the reflectivity of the reflecting film is reduced and the light transmittance of the reflecting film is increased. When the reflecting film is reduced in stretching deformation, the reflectivity of the reflecting film is increased and the light transmittance is reduced. 
     One end of the highly elastic reflecting film may be fixed to the diaphragm carrier  812 A of the diaphragm structure  81 A, and the other end may be fixed to a side of the diaphragm moving portion  811 A of the diaphragm structure  81 A close to the light hole  810 A. When the light hole  810 A of the diaphragm moving portion  811 A is gradually reduced, the highly elastic reflecting film is stretched, so that the reflectivity is reduced. When the light hole  810 A of the diaphragm moving portion  811 A is gradually enlarged, the highly elastic reflecting film is stretched and reduced, so that the reflectivity is increased. 
     The control of the luminance and color of the light supplementing unit  80 A is achieved by controlling the aperture size of the light hole  810 A of the diaphragm structure  81 A. 
     Referring to  FIG. 69 , another implementation mode of the display unit according to the above preferred embodiment of the present invention is shown. 
     In the present example, the light supplementing unit  80 A includes one of the diaphragm structures  81 A, and the diaphragm structure  81 A is capable of emitting light. The diaphragm structure  81 A may be made of a light emitting material, and may radiate light outward in the case of energization. 
     The diaphragm structure  81 A may be an OLED structure capable of emitting light and displaying when energized. When the camera module  30 A operates, the diaphragm structure  81 A may be de-energized, and the aperture of the light hole  810 A may be controlled by controlling the position of the diaphragm moving portion  811 A of the diaphragm structure  81 A. When the camera module  30 A does not operate, the diaphragm structure  81 A may be energized and then emit light and play a display role to facilitate the display effect of the entire display screen  20 A. 
     Referring to  FIG. 70 , another implementation mode of the display unit according to the present invention is shown. 
     In the present example, the display unit includes a display screen  20 A and a light supplementing unit  80 A. The display screen  20 A includes, from top to bottom, a cover plate layer  21 , a touch layer  23 A, a polarization layer  24 A, a pixel layer  25 A, a drive circuit layer  26 A, and a back plate layer  27 A. The drive circuit layer  26 A is formed on a bottom side of the pixel layer  25 A and electrically connected to the pixel layer  25 A so as to drive the pixel layer  25 A to operate. The encapsulation layer  22 A is formed on a top side of the pixel layer  25 A for encapsulating the pixel layer  25 A. The light through hole  200 A penetrates through the touch layer  23 A, the polarization layer  24 A, the encapsulation layer  22 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A in a height direction. The back plate layer  27 A is located on the bottommost layer. 
     The display screen  20 A is an LCD screen and the light supplementing unit  80 A is located inside the display screen  20 A. 
     Specifically, the light supplementing unit  80 A is located on the drive circuit layer  26 A below the pixel layer  25 A. The light supplementing unit  80 A is mounted to the drive circuit layer  26 A and a diaphragm structure  81 A of the light supplementing unit  80 A is aligned with the light through hole  200 A of the display screen  20 A. The drive circuit layer  26 A includes a plurality of TFT structures  261 A and a substrate base  262 A. The TFT structures  261 A are provided to the substrate base  262 A. Preferably, the light supplementing unit  80 A is provided between the adjacent TFT structures  261 A. 
     Light outside the display screen  20 A needs to pass through the diaphragm structure  81 A before reaching the position of the camera module  30 A located below the display screen  20 A. The display screen  20 A has a mounting channel  201 A. The mounting channel  201 A is formed on the back plate layer  27 A of the display screen  20 A for accommodating at least a part of the camera module  30 A. 
     The light supplementing unit  80 A includes the diaphragm structure  81 A and a light emitting structure  82 A. The light emitting structure  82 A is provided to at least a part of the diaphragm structure  81 A so as to radiate light outward, in particular, radiate light toward the outside of the display screen  20 A, thereby facilitating the display effect of the position of the light through hole  200 A of the display screen  20 A. 
     The diaphragm structure  81 A includes a diaphragm moving portion  811 A, a diaphragm carrier  812 A, and a diaphragm driving portion  813 A. The diaphragm moving portion  811 A is provided to the diaphragm carrier  812 A. The diaphragm moving portion  811 A is drivable connected to the diaphragm driving portion  813 A. 
     The diaphragm structure  81 A is capable of forming a light hole  810 A, and light can pass through the light hole  810 A. Further, the light hole  810 A is formed in the diaphragm moving portion  811 A and the aperture size of the light hole  810 A may be adjusted as the diaphragm moving portion  811 A is driven by the diaphragm driving portion  813 A. 
     The light emitting structure  82 A is provided to the diaphragm moving portion  811 A. Preferably, the light emitting structure  82 A is provided to the upper surface of the diaphragm moving portion  811 A. When the display screen  20 A needs to display, the light emitting structure  82 A may emit light so as to supplement light around the light through hole  200 A of the display screen  20 A. When the camera module  30 A operates, the light emitting structure  82 A may stop emitting light, and the size of the light hole  810 A of the diaphragm structure  81 A may be adjusted to control the amount of light entering the camera module  30 A. 
     In the present embodiment, the diaphragm moving portion  811 A includes a plurality of blades  8111 A, and the light emitting structure  82 A is provided to the blades  8111 A of the diaphragm moving portion  811 A. The blades  8111 A may be drivable connected to the diaphragm driving portion  813 A. 
     According to other embodiments of the present invention, the diaphragm moving portion  811 A of the diaphragm structure  81 A is made of a light emitting material and capable of emitting light. 
     According to other embodiments of the present invention, the light emitting structure  82 A may be covered, embedded, and at least partially embedded on the upper surface of the diaphragm moving portion  811 A of the diaphragm structure  81 A. 
     According to other embodiments of the present invention, the diaphragm moving portion  811 A of the diaphragm structure  81 A may be fully transparent and the lower surface of the diaphragm moving portion  811 A of the diaphragm structure  81 A may be provided with a light-shielding material. The diaphragm structure  81 A may also be at least partially light-transmitting. The light emitting structure  82 A may be embedded in the diaphragm moving portion  811 A of the diaphragm structure  81 A and light is radiated outward by a light transmitting portion of the diaphragm moving portion  811 A. 
     Referring to  FIG. 71 , another implementation mode of the display unit according to the present invention is shown. 
     In the present example, the display unit includes a display screen  20 A and a light supplementing unit  80 A. The display screen  20 A includes a cover plate layer  21 , an encapsulation layer  22 A, a touch layer  23 A, a polarization layer  24 A, a pixel layer  25 A, a drive circuit layer  26 A, and a back plate layer  27 A. The drive circuit layer  26 A is formed on a bottom side of the pixel layer  25 A and electrically connected to the pixel layer  25 A so as to drive the pixel layer  25 A to operate. The encapsulation layer  22 A is formed on a top side of the pixel layer  25 A for encapsulating the pixel layer  25 A. The light through hole  200 A penetrates through the touch layer  23 A, the polarization layer  24 A, the encapsulation layer  22 A, the pixel layer  25 A, the drive circuit layer  26 A, and the back plate layer  27 A in a height direction. The back plate layer  27 A is located on the bottommost layer. 
     The display screen  20 A is an LCD screen and the light supplementing unit  80 A is located inside the display screen  20 A. 
     Specifically, the light supplementing unit  80 A is located on the back plate layer  27 A below the pixel layer  25 A. The light supplementing unit  80 A is mounted to the back plate layer  27 A and a diaphragm structure  81 A of the light supplementing unit  80 A is aligned with the light through hole  200 A of the display screen  20 A. The diaphragm structure  81 A of the light supplementing unit  80 A may be mounted to the back plate layer  27 A by first perforating the back plate layer  27 A. 
     Light outside the display screen  20 A needs to pass through the diaphragm structure  81 A before reaching the position of the camera module  30 A located below the display screen  20 A. The display screen  20 A has a mounting channel  201 A. The mounting channel  201 A is formed on the back plate layer  27 A of the display screen  20 A for accommodating at least a part of the camera module  30 A. 
     The light supplementing unit  80 A includes the diaphragm structure  81 A and a light emitting structure  82 A. The light emitting structure  82 A is provided to at least a part of the diaphragm structure  81 A so as to radiate light outward, in particular, radiate light toward the outside of the display screen  20 A, thereby facilitating the display effect of the position of the light through hole  200 A of the display screen  20 A. 
     The diaphragm structure  81 A includes a diaphragm moving portion  811 A, a diaphragm carrier  812 A, and a diaphragm driving portion  813 A. The diaphragm moving portion  811 A is provided to the diaphragm carrier  812 A. The diaphragm moving portion  811 A is drivable connected to the diaphragm driving portion  813 A. 
     The diaphragm structure  81 A is capable of forming a light hole  810 A, and light can pass through the light hole  810 A. Further, the light hole  810 A is formed in the diaphragm moving portion  811 A and the aperture size of the light hole  810 A may be adjusted as the diaphragm moving portion  811 A is driven by the diaphragm driving portion  813 A. 
     The light emitting structure  82 A is provided to the diaphragm moving portion  811 A. Preferably, the light emitting structure  82 A is provided to the upper surface of the diaphragm moving portion  811 A. When the display screen  20 A needs to display, the light emitting structure  82 A may emit light so as to supplement light around the light through hole  200 A of the display screen  20 A. When the camera module  30 A operates, the light emitting structure  82 A may stop emitting light, and the size of the light hole  810 A of the diaphragm structure  81 A may be adjusted to control the amount of light entering the camera module  30 A. 
     In the present embodiment, the diaphragm moving portion  811 A includes a plurality of blades  8111 A, and the light emitting structure  82 A is provided to the blades  8111 A of the diaphragm moving portion  811 A. The blades  8111 A may be drivable connected to the diaphragm driving portion  813 A. 
     It will be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are illustrative only and do not limit the present invention. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the implementation modes of the present invention without departing from the principles.