Patent Publication Number: US-2023164444-A1

Title: Electronic Device and In-Screen Optical Detection Assembly

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to Chinese Patent Application No. 202011270729.2, filed with China National Intellectual Property Administration on Nov. 13, 2020, and entitled “ELECTRONIC DEVICE AND IN-SCREEN OPTICAL DETECTION ASSEMBLY”, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present application relates to the field of electronic device technologies, and in particular, to an electronic device and an in-screen optical detection assembly. 
     BACKGROUND 
     When an electronic device is used for photographing, due to the influence of an ambient color temperature, color cast may occur to a photographed photo. For example, under the light of an indoor incandescent lamp, a photo photographed by the electronic device may be yellowish. To improve the influence of the ambient color temperature on the photographing effect, some existing electronic devices are usually provided with color temperature sensors to detect the ambient color temperature, so that a photographing effect can be adjusted according to the detected ambient color temperature during photographing. In a current electronic device, the color temperature sensors are each disposed on a rear side of the electronic device and configured to detect an ambient color temperature on a rear side of the electronic device, so as to adjust the photographing effect of a rear camera module. During use of the electronic device, ambient light on the rear side and a screen side is often different. If the photographing effect of a front camera module is adjusted by using the ambient color temperature detected by the color temperature sensor on the rear side, a photo photographed by the front camera module still has a color cast risk. 
     SUMMARY 
     The present application provides an electronic device and an in-screen optical detection assembly, to detect an ambient color temperature on a screen side. 
     According to a first aspect, the present application provides an electronic device, including a middle frame, a screen, a circuit board, and a color temperature detection assembly. The screen includes a display and a cover plate disposed on one side of the display; the middle frame is disposed between the display and the circuit board and provided with a first through hole, and two ends of the first through hole face the display and the circuit board respectively; an optical detection assembly includes a light shield body and a light sensor, where the light shield body includes a first end and a second end that are opposite to each other, the light shield body is provided with a light hole penetrating from the first end to the second end, the first end of the light shield body is connected to the circuit board, and the second end passes through the first through hole and extends to one side of the screen facing the middle frame; and the light sensor is disposed on the circuit board and located in the light hole. 
     In the foregoing solution, the optical detection assembly is disposed below the screen, and therefore can detect ambient light on the screen side, so that a display image of the screen or a photographing effect of a front camera module of the electronic device can be adjusted according to a result of detection by the light sensor; furthermore, through the arrangement of the light shield body, after passing through the screen, the ambient light can propagate to the light sensor through the light hole of the light shield body, so that a propagation path of the ambient light can be limited, and light inside the electronic device can be blocked. Therefore, the light inside the electronic device can be prevented from entering the light shield body, and accuracy of the result of detection by the light sensor can be improved. 
     In some possible implementation solutions, the first end of the light shield body may be hermetically connected to the circuit board to prevent the dust inside the electronic device from entering the light hole and reduce a risk that the dust falling on a color temperature sensor affects detection sensitivity of the color temperature sensor. In addition, this arrangement can further reduce risks of light leakage and optical crosstalk at the first end of the light shield body, and improve the light blocking effect of the light shield body. 
     In specific arrangement, foam may be disposed between the first end of the light shield body and the circuit board, and the foam is squeezed to achieve sealing. Two sides of the foam may be bonded to the light shield body and the circuit board respectively, so as to improve structural reliability of the electronic device. 
     In some possible implementation solutions, the first end of the light shield body is provided with an extension wall disposed in a circumferential direction of the light shield body, the extension wall is disposed between a middle board and the circuit board, and one side of the extension wall facing the circuit board is hermetically connected to the circuit board, so as to increase a contact area between the light shield body and the foam and achieve better sealing; and the other side of the extension wall facing the middle frame is further fixedly connected to the middle frame by using gum, so as to reliably fix the light shield body in the electronic device. 
     In some possible implementation solutions, the display is a non-transparent display, the display is provided with a first opening opposite to the first through hole, and the second end of the light shield body may pass through the first through hole and the first opening in sequence and extend to one side of the cover plate facing the middle frame. In this case, after passing through the cover plate, the ambient light can be propagated to the light sensor through the light hole inside the light shield body. 
     In the foregoing solution, a gap is provided between the second end of the light shield body and the cover plate, so that when the screen and the middle frame are assembled, the second end of the light shield body can be prevented from squeezing the cover plate, thereby ensuring structural stability of the electronic device. 
     In specific arrangement, the foregoing gap may have a size of 0.11 mm to 0.13 mm. It has been verified by experiments that when the gap is within this range, the electronic device can be assembled reliably, and light emitted by the display may be prevented from reaching the light hole through the gap, thereby improving accuracy of the result of detection by the light sensor. 
     In some possible implementation solutions, the display is a transparent display, and the second end of the light shield body may pass through the first through hole and extend to one side of the display facing the middle frame. In this case, after passing through the cover plate and the display in sequence, the ambient light can be propagated to the light sensor through the light hole inside the light shield body. 
     Similarly, in the foregoing solution, a gap is provided between the second end of the light shield body and the display, so that when the screen and the middle frame are assembled, the second end of the light shield body can be prevented from squeezing the display, thereby ensuring structural stability of the electronic device. In specific arrangement, the foregoing gap may have a size of 0.11 mm to 0.13 mm. 
     In some possible implementation solutions, a light-shielding black glue layer is disposed on a surface of the light shield body to improve the light-shielding performance of the light shield body. In specific arrangement, the light-shielding black glue layer may be an ink layer. 
     In some possible implementation solutions, the optical detection assembly further includes a lens disposed in the light hole, a light inlet side of the lens is disposed toward the second end of the light shield body, and a light outlet side of the lens is disposed toward the light sensor. The lens can converge ambient light from each incident direction into a beam that propagates approximately in an axis direction of the light hole, thereby increasing the density of ambient light propagating to the color temperature sensor, and improving the accuracy of the detection result of the color temperature sensor. 
     In some possible implementation solutions, the light hole may include a first hole segment and a second hole segment, where the first hole segment is disposed close to the first end of the light shield body, the second hole segment is disposed close to the second end of the light shield body, and a first stepped surface disposed toward the first end of the light shield body is formed between the first hole segment and the second hole segment; a peripheral side of the lens is provided with a second stepped surface disposed toward the second end of the light shield body; when the lens is installed in the light hole, one end of the light inlet side of the lens extends into the second hole segment, the second stepped surface of the lens is opposite to the first stepped surface in the light hole, and the two stepped surfaces are bonded to each other by using gum, so as to fix the lens in the light hole. 
     In some possible implementation solutions, the optical detection assembly may further include a light homogenizing film, where the light homogenizing film is fixed to the light outlet side of the lens, and may be configured to convert light emitted from the light outlet side of the lens into a surface light source, so that each photosensitive region of the color temperature sensor can receive uniform light with similar intensities, thereby improving the detection accuracy of the color temperature sensor. 
     Because the light homogenizing film is usually white, to prevent the screen side of the electronic device from appearing white in appearance, the lens may be dark in color, so that the color of the light homogenizing film can be blocked, so as to improve appearance quality of the electronic device. 
     In specific arrangement, the light sensor may be a color temperature sensor for detecting an ambient color temperature, or an ambient light sensor for detecting an intensity of ambient light, or the like. 
     In some possible implementation solutions, the middle frame may be further provided with a second through hole. The electronic device further includes a camera module, where the camera module includes an optical lens, and a light inlet side of the optical lens may pass through the second through hole and extend to one side of the screen facing the middle frame. In this way, the ambient light result of detection by the light sensor can be used to adjust the photographing effect of the camera module, thereby improving the color cast of a photographed photo. 
     According to a second aspect, the present application further provides an electronic device, including a middle frame, a screen, a circuit board, an optical detection assembly, and a camera module. The middle frame is located between the display and the circuit board and provided with a first through hole and a second through hole. The screen includes a display and a cover plate located on one side of the display that faces away from the middle frame. The display is provided with a first opening and a second opening at positions corresponding to the first through hole and the second through hole respectively, and the first opening may communicate with the second opening to be a whole. The optical detection assembly includes a light shield body, a light sensor, a lens, and a light homogenizing film, where a first end of the light shield body is provided with an extension wall disposed in a circumferential direction of the light shield body, the extension wall is disposed between a middle board and the circuit board, one side of the extension wall facing the circuit board is hermetically connected to the circuit board, the other side of the extension wall facing the middle frame may be further fixedly connected to the middle frame by using gum, so as to reliably fix the light shield body in the electronic device; a second end of the light shield body passes through the first through hole and the first opening in sequence and extends to one side of the cover plate facing the middle frame; the light shield body is provided with a light hole penetrating from the first end to the second end, the light hole may include a first hole segment and a second hole segment, the first hole segment is disposed close to the first end of the light shield body, the second hole segment is disposed close to the second end of the light shield body, and a first stepped surface disposed toward the first end of the light shield body is formed between the first hole segment and the second hole segment; the light sensor is disposed on the circuit board and located in the light hole; the lens is disposed in the light hole, a light inlet side of the lens is disposed toward the second end of the light shield body, a light outlet side of the lens is disposed toward the light sensor, a peripheral side of the lens is provided with a second stepped surface disposed toward the second end of the light shield body, one end of the light inlet side of the lens extends into the second hole segment, and the second stepped surface of the lens is fixedly connected to the first stepped surface in the light hole, and the lens is dark in color; the light homogenizing film is fixed to the light outlet side of the lens, and may be configured to convert light emitted from the light outlet side of the lens into a surface light source; the camera module includes an optical lens, and a light inlet side of the optical lens may pass through the second through hole and extend into the second opening, to collect ambient light entering the electronic device from the cover plate, where a distance between the optical lens and the shield body of the optical detection assembly is less than 1 cm. 
     In the foregoing solution, the optical detection assembly is disposed below the screen, and therefore can detect ambient light on the screen side, so that a photographing effect of the camera module can be adjusted according to a result of detection by the light sensor. In addition, the shape of the light shield body is similar to the shape of the optical lens. The second end of the light shield body and the lens located in the light shield body, which are seen by a user through the cover plate from the screen side of the electronic device, are basically the same as the light inlet side of the optical lens. That is, seen from the screen side the optical detection assembly is shaped like a camera, and therefore a visual effect of the appearance of the electronic device can be optimized to a certain extent. 
     According to a third aspect, the present application further provides an in-screen optical detection assembly, including a light shield body and a light sensor, where the light shield body includes a first end and a second end that are opposite to each other, and the light shield body is provided with a light hole penetrating from the first end to the second end of the light shield body; the light sensor is located in the light hole, and a photosensitive region of the light sensor is disposed toward the second end. 
     In the foregoing solution, the in-screen optical detection assembly can detect ambient light on the screen side of the electronic device, so that a display image of the screen or a photographing effect of a front camera module of the electronic device can be adjusted according to a result of detection by the light sensor; furthermore, through the arrangement of the light shield body, a propagation path of the ambient light can be limited, and light outside the in-screen optical detection assembly can be blocked. Therefore, the external light can be prevented from entering the light shield body, and accuracy of the result of detection by the light sensor can be improved. 
     In some possible implementation solutions, the optical detection assembly further includes a lens disposed in the light hole, a light inlet side of the lens is disposed toward the second end of the light shield body, and a light outlet side of the lens is disposed toward the light sensor. The lens can converge ambient light from each incident direction into a beam that propagates approximately in an axis direction of the light hole, thereby increasing the density of ambient light propagating to the color temperature sensor, and improving the accuracy of the detection result of the color temperature sensor. 
     In some possible implementation solutions, the light hole may include a first hole segment and a second hole segment, where the first hole segment is disposed close to the first end of the light shield body, the second hole segment is disposed close to the second end of the light shield body, and a first stepped surface disposed toward the first end of the light shield body is formed between the first hole segment and the second hole segment; a peripheral side of the lens is provided with a second stepped surface disposed toward the second end of the light shield body; when the lens is installed in the light hole, one end of the light inlet side of the lens extends into the second hole segment, the second stepped surface of the lens is opposite to the first stepped surface in the light hole, and the two stepped surfaces are bonded to each other by using gum, so as to fix the lens in the light hole. 
     In some possible implementation solutions, the light shield body has a cylindrical structure, and includes a first shaft segment and a second shaft segment, where the first shaft segment is disposed corresponding to the first hole segment, the second shaft segment is disposed corresponding to the second hole segment, and a diameter of the first shaft segment is greater than a diameter of the second shaft segment. In this way, when the first hole segment and the second hole segment are formed, the influence on the structural strength of the light shield body can be reduced. 
     In some possible implementation solutions, the optical detection assembly may further include a light homogenizing film, where the light homogenizing film is fixed to the light outlet side of the lens, and may be configured to convert light emitted from the light outlet side of the lens into a surface light source, so that each photosensitive region of the color temperature sensor can receive uniform light with similar intensities, thereby improving the detection accuracy of the color temperature sensor. 
     Because the light homogenizing film is usually white, to prevent the screen side of the electronic device from appearing white in appearance, the lens may be dark in color, so that the color of the light homogenizing film can be blocked, so as to improve appearance quality of the electronic device. 
     In specific arrangement, the light sensor may be a color temperature sensor for detecting an ambient color temperature, or an ambient light sensor for detecting an intensity of ambient light, or the like. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a partially exploded schematic diagram of an electronic device  1  provided in an embodiment of the present application; 
         FIG.  2    is a front view of an electronic device provided in an embodiment of the present application; 
         FIG.  3    is a partial sectional view of the electronic device in  FIG.  2    in a direction A-A; 
         FIG.  4    is a sectional view of a front camera module provided in an embodiment of the present application in the direction A-A; 
         FIG.  5    is a sectional view of an optical detection assembly provided in an embodiment of the present application in the direction A-A; 
         FIG.  6    is a schematic structural diagram of an optical detection assembly provided in an embodiment of the present application; 
         FIG.  7    is a principle diagram of light propagation of a lens provided in an embodiment of the present application; and 
         FIG.  8    is another sectional view of an optical detection assembly provided in an embodiment of the present application. 
     
    
    
     REFERENCE NUMERALS 
       1 —electronic device;  100 —housing;  200 —screen;  300 —circuit board;  400 —camera module;  110 —middle frame;  120 —rear cover;  111 —frame body;  112 —middle board;  210 —first cover plate;  220 —display;  310 —avoidance space;  113 —through hole;  121 —light inlet hole;  400   a —rear camera module;  221 —opening;  400   b —front camera module;  410 —optical lens;  420 —photosensitive chip;  430 —module circuit board;  440 —optical filter;  500 —optical detection assembly;  10 —color temperature sensor;  113   a —first through hole;  113   b —second through hole;  221   a —first opening;  221   b —second opening;  20 —light shield body;  21 —first end of the light shield body;  22 —second end of the light shield body;  23 —light hole;  30 —foam;  24 —extension wall;  40 —lens;  41 —light inlet side;  42 —light outlet side;  25 —first shaft segment;  26 —second shaft segment;  231 —first hole segment;  232 —second hole segment;  233 —first stepped surface;  41 —second stepped surface;  50 —light homogenizing film. 
     DESCRIPTION OF EMBODIMENTS 
     The technical solutions in the implementations of the present application are clearly and completely described below in conjunction with the accompanying drawings in the implementations of the present application. 
     It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following accompanying drawings. Therefore, once an item is defined in one accompanying drawing, the item does not need to be further defined and explained in the subsequent accompanying drawings. 
     In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms such as “middle”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, or “outer” is based on the orientation or positional relationship shown in the accompanying drawings, which is only for ease of describing the present application and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation and be constructed and operated in a specific orientation, and therefore it cannot be understood as a limitation to the present application. In addition, the terms “first” and “second” are used for descriptive purposes only and should not to be construed as indicating or implying relative importance. 
     In the description of the present application, it should be noted that, unless otherwise specified and defined, the terms “install”, “connection”, and “connected to” should be comprehended in a broad sense. For example, the connection may be comprehended as being fixedly connected, detachably connected, or integrally connected; or mechanically connected or electrically connected; or directly connected or indirectly connected by using an intermediate medium, or in an internal communication between two elements. The specific meanings about the foregoing terms in the present application may be understood by a person of ordinary skill in the art according to specific circumstances. 
     Referring to  FIG.  1   ,  FIG.  1    is a partially exploded schematic diagram of an electronic device  1  provided in an embodiment of the present application. The electronic device  1  may be a mobile phone, a tablet personal computer (tablet personal computer), a camera, a smart TV, a smart screen, a notebook computer, an electronic paper, or the like. The electronic device  1  in the embodiment shown in  FIG.  1    is described by using a mobile phone as an example. 
     In this embodiment of the present application, the electronic device may include a housing  100 , a screen  200 , a circuit board  300 , and a camera module  400 . It should be noted that  FIG.  1    and the following related accompanying drawings only schematically show some components included in the electronic device  1 , and actual shapes, actual sizes, actual positions and actual configurations of these components are not limited by  FIG.  1    and the following accompanying drawings. 
     For ease of description, a width direction of the electronic device  1  is defined as an x-axis, a length direction of the electronic device  1  is a y-axis, and a thickness direction of the electronic device  1  is a z-axis, where the x-axis, the y-axis, and the z-axis are perpendicular to each other. Understandably, a coordinate system of the electronic device  1  may be flexibly set according to specific actual needs. 
     The housing  100  may include a front cover  210 , a middle frame  110 , and a rear cover  120 . In specific arrangement, the middle frame  110  may include a frame body  111  and a middle board  112  disposed inside the frame body  111 . The rear cover  120  is fixed to one side of the frame body  111 , and the rear cover  120  and the middle board  112  are opposite to each other and spaced. In an implementation, the rear cover  120  may be fixedly connected to the middle frame  110  by using an adhesive. In another implementation, the rear cover  120  and the middle frame  110  may alternatively form an integrally formed structure, that is, the rear cover  120  and the middle frame  110  are an integral structure. The front cover  210  is fixed to the other side of the frame  111 , and the front cover  210 , the frame body  111 , and the rear cover  120  jointly enclose the inside of the electronic device  1 . The inside of the electronic device  1  may be used to place devices of the electronic device  1 , such as the circuit board  300 , the camera module  400 , a battery, a receiver, and a microphone. In an implementation, the front cover  210  may be fixedly connected to the frame body  111  by using an adhesive. In another implementation, two sides of the front cover  210  (for example, two sides in an x-axis direction) may further extend to the position of the rear cover  120  in a z-axis direction and be fixedly connected to the rear cover  120 . In this case, the frame body  111  may be located around the electronic device  1  or only on an upper side and a lower side of the electronic device  1  (that is, two sides in a y-axis direction). In addition, when two sides of the front cover  210  extend to the position of the rear cover  120 , the front cover  210  and the rear cover  120  may alternatively form an integrally formed structure, that is, the front cover  210  and the rear cover  120  are a whole. 
     With continued reference to  FIG.  1   , in this embodiment, the screen  200  is fixed to the other side of the middle frame  110  opposite to the rear cover. In this case, the screen  200  is opposite to the rear cover  120 . The screen  200  may be configured to display images, text, and the like. The screen  200  may be a flat screen or a curved screen. The screen  200  includes a cover plate and a display  220 , where the cover plate may be the front cover  210  described above, and the cover plate is stacked on one side of the display  220  that faces away from the middle frame  110 . It should be noted that hereinafter, reference numerals of the cover plate and the front cover  210  are the same. The cover plate  210  may be closely attached to the display  220 , and may be mainly used to protect the display  220  and prevent dust. The cover plate  210  is made of a transparent material, which, for example, may be glass or plastic. The display  220  may be a liquid crystal display (Liquid Crystal Display, LCD for short), an organic light-emitting diode (organic light-emitting diode, OLED for short) display, an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED for short) display, a quantum dot light emitting diodes (quantum dot light emitting diodes, QLED for short) display, a micro light emitting diode (Micro Light Emitting Diode, Micro LED for short) display, or the like. The display  220  may be a transparent display or a non-transparent display, and no limitation is imposed on this in the present application. When the display  220  is a transparent display, ambient light can pass through the transparent display and enter the electronic device. When the display is a non-transparent display, the display can block the ambient light, and in this case, the ambient light cannot pass through the display. 
     In another implementation, the display  220  and two sides of the cover plate  210  may extend to the position of the rear cover  120  in the z-axis direction together. This can increase the size of the screen  200  and improve the overall performance and appearance quality of the electronic device  1 . 
     In addition, in some other possible implementations, the rear cover  120  may alternatively be a screen, that is, the rear cover  120  may also be used for display. In this case, the rear cover  120  and the screen  200  on a front side of the electronic device  1  may be used as an integral curved screen, or the rear cover  120  and the screen  200  on the front side of the electronic device  1  may be designed independently to display different contents. 
     In some implementations, the electronic device may alternatively be a mobile phone with a foldable screen. In this case, the electronic device may further include a rotating shaft mechanism, and the housing includes two sub-housings disposed on two sides of the rotating shaft mechanism. The two sub-housings are separately and rotatably connected to the rotating shaft mechanism, so as to achieve switching of the mobile phone between an unfolded state and a folded state when rotating around the rotating shaft mechanism. The screen is fixed to one side of the two sub-housings, and to adapt to the folded and unfolded states of the mobile phone, the screen may be specifically a flexible screen. 
     With continued reference to  FIG.  1   , the circuit board  300  is fixed inside the electronic device  1 . In an implementation, the circuit board  300  may be fixed to one side of the middle board  112  facing the rear cover, and the circuit board  300  is located between the middle board  112  and the rear cover  120 . Understandably, the circuit board  300  may be a rigid circuit board, a flexible circuit board, or a rigid-flex circuit board. The circuit board  300  may be an epoxy board (FR-4), a Rogers dielectric board, a FR-4 and Rogers mixed dielectric board, or the like. Herein, FR-4 is a code name for a flame-resistant material grade, and the Rogers dielectric board is a high-frequency board. In addition, the circuit board  300  may be configured to carry electronic devices such as a chip, a capacitor, and an inductor, and may electrically connect the electronic devices. The chip may be a central processing unit (central processing unit, CPU for short), a graphics processing unit (graphics processing unit, GPU for short), a digital signal processing (digital signal processing, DSP for short) chip, a universal flash memory (universal flash storage, UFS for short), or the like. 
     The camera module  400  is fixed in the housing  100 , and is configured to enable the electronic device  1  to achieve functions such as photographing or video recording. In an embodiment, the camera module  400  may be fixed to one side of the middle board  112 . The circuit board  300  may be provided with an avoidance space  310 , and the avoidance space  310  may be in a shape matching a shape of the camera module  400 , for example, a rectangular shape illustrated in  FIG.  1   . Certainly, in other implementations, the avoidance space  310  may alternatively be circular, oval or in an irregular shape or the like, and no specific limitation is imposed on this in the present application. The camera module  400  is located in the avoidance space  310 . In this way, in the z-axis direction, the camera module  400  and the circuit board  300  have an overlapping region, thereby avoiding the increase of the thickness of the electronic device  1  caused by the stacking of the camera module  400  on the circuit board  300 . In other embodiments, the circuit board  300  may alternatively be provided with no avoidance space  310 . In this case, the camera module  100  may be stacked directly on the circuit board  300  or spaced from the circuit board  300  by using other supporting structures. 
     In an embodiment, the electronic device may further include connecting devices such as a mobile industry processor interface (mobile industry processor interface, MIPI for short) and a general-purpose input/output (general-purpose input/output, GPIO for short). The MIPI may be configured to connect a CPU to a peripheral device such as the display or the camera module. The MIPI includes a camera serial interface (camera serial interface, CSI for short), a display serial interface (display serial interface, DSI for short), or the like. In some embodiments, the CPU communicates with the camera module by using the CSI to achieve a photographing function of the electronic device. The CPU communicates with the display by using the DSI to achieve a display function of the electronic device. 
     The GPIO interface may be configured by using software. The GPIO interface may be configured as a control signal or a data signal. In some embodiments, The GPIO interface may be configured to connect the CPU to camera module or the like. The GPIO interface may alternatively be configured as an I2C interface, an I2S interface, an MIPI, a universal asynchronous receiver/transmitter (universal asynchronous receiver/transmitter, UART for short), or the like. 
     The electronic device may achieve a photographing function by using an ISP, the camera module, a video codec, a GPU, the display, an application processor, or the like. 
     The ISP is configured to process data fed back by the camera module. For example, during photographing, a shutter is opened, so that light is transmitted to a photosensitive element of a camera by using a lens, and a light signal is converted into an electrical signal. The photosensitive element of the camera transmits the electrical signal to the ISP for processing, and the signal is converted into an image visible to naked eyes. The ISP may further optimize noise, brightness and a skin color of an image by using an algorithm. The ISP may further optimize parameters such as exposure and a color temperature of a photographing scenario. In some embodiments, the ISP may be disposed in the camera module. 
     In some embodiments, the electronic device may include 1 or N camera modules, where N is a positive integer greater than 1. In an example, the camera module may include a wide-angle camera, a photographic camera, a 3D depth camera (such as a structured light camera, or a time-of-flight (time-of-flight, ToF) camera), a telephoto camera, or the like. 
     In addition, according to different light inlet directions of the camera module  400 , the electronic device  1  can achieve front-facing photographing or rear-facing photographing. For example, when the light inlet side of the camera module  400  is disposed toward one side of the rear cover  120 , the electronic device  1  can achieve rear-facing photographing; when the light inlet side of the camera module  400  is disposed toward one side of the screen  200 , the electronic device  1  can achieve front-facing photographing. In this case, the middle board  112  may be provided with a through hole  113 , so that the light inlet side of the camera module  400  can receive ambient light from the screen  200  side through the through hole  113 . For ease of description, hereinafter, a camera module for achieving rear-facing photographing is referred to as a rear camera module  400   a,  and a camera module for achieving front-facing photographing is referred to as a front camera module  400   b.    
     The rear cover  120  of the electronic device  1  with the rear-facing photographing function is provided with a light inlet hole  121 , and the light inlet hole  121  enables the inside of the electronic device  1  to communicate with the outside of the electronic device  1 . A protective cover plate (not shown in the figure) is provided at the light inlet hole  121 , and the protective cover plate can separate the inside of the electronic device  1  from the outside of the electronic device  1 , so as to prevent external water or dust from entering the electronic device  1  through the light inlet hole  121 . The protective cover plate is made of a transparent material, which, for example, may be glass or plastic. A light inlet side of the rear camera module  400   a  is opposite to the light inlet hole  121 , and ambient light outside the electronic device  1  can pass through the protective cover plate and enter the inside of the electronic device  1 , and then can be collected by the rear camera module  400   a  to form an image or a video. 
     In other embodiments, the rear camera module  400   a  can also collect ambient light passing through the rear cover  120 . Specifically, the rear cover  120  is made of a transparent material, such as glass or plastic. A surface of the rear cover  120  facing the inside of the electronic device  1  is partially coated with ink and partially uncoated with ink. In this case, a region uncoated with ink may form a light-transmitting region. When ambient light enters the inside of the electronic device  1  through the light-transmitting region, the rear camera module  400   a  can collect the ambient light. That is, the electronic device  1  may not need to be provided with the light inlet hole  121  and does not need to be provided with the protective cover plate, and the electronic device  1  has better integrity and a lower cost. 
     In an implementation, the display  220  of the electronic device  1  with the front-facing photographing function is provided with an opening  221 , and the opening  221  is specifically opposite to the through hole  113  in the middle board  112 . It should be noted that, the opening is opposite to the through hole, which may be understood as that projections of the two holes in an xy plane overlap or partially overlap, so that the light inlet side of the front camera module  400   b  can pass through the through hole  113  and the opening  221  in sequence, and collect ambient light entering the electronic device  1  from the cover plate  210 , to form an image or a video. 
     Understandably, when the electronic device  1  uses a transparent display, no opening needs to be provided in the display  220 , and the light inlet side of the front camera module  400   b  extends into the through hole  113 , so as to collect ambient light entering the electronic device  1  from the cover plate  210  and the display  220 . 
     When the electronic device  1  is used for photographing, due to the influence of an ambient color temperature, color cast may occur to a photographed photo. For example, under the light of an indoor incandescent lamp, a photo photographed by the electronic device  1  may be yellowish. This is because a photosensitive chip of the camera module  400  is generally designed and produced according to a standard color temperature. Therefore, only when the color temperature of a photographing environment is the same as the standard color temperature, it is possible to exclude a photo with the same color as the natural light. Color cast will occur to the photo if the color temperature of the photographing environment is above or below the standard color temperature. 
     It should be noted that the color temperature is a unit of measurement that indicates color components contained in light. Theoretically, a blackbody temperature refers to a color of an absolute blackbody after heating from absolute zero (−273° C.). After being heated, the blackbody gradually turns from black to red, to yellow, to white, and finally emits blue light. When heated to a certain temperature, a spectral component contained in the light emitted by blackbody is referred to as the color temperature at this temperature. A higher temperature of the “blackbody” indicates more blue components in the spectrum and less red components. The color temperature is usually expressed by using Kelvin temperature (K). It is generally considered that the color temperature of standard white light is 6500 K. 
     To improve the influence of the ambient color temperature on the photographing effect, some existing electronic devices are usually provided with color temperature sensors to detect the ambient color temperature, so that a photographing effect can be adjusted according to the detected ambient color temperature during photographing. Specifically, when the color temperature sensor detects that the ambient color temperature is excessively low, the electronic device will increase the color temperature of an image during photographing, that is, in layman&#39;s terms, a blue tone is added to the image to photograph a photo with a normal color temperature. When the color temperature sensor detects that the ambient color temperature is excessively high, the electronic device will lower the color temperature of the image during photographing, that is, a red tone is added to the image, so as to photograph a photo with a normal color temperature. 
     In some embodiments, the color temperature sensor is disposed on a rear cover side of the electronic device and configured to detect an ambient color temperature on a rear side of the electronic device, so as to adjust the photographing effect of the rear camera module. During use of the electronic device, ambient light on the rear cover side and a screen side is often different. If the photographing effect of a front camera module is adjusted by using the ambient color temperature detected by the color temperature sensor on the rear cover side, a photo photographed by the front camera module still has a color cast risk. 
     In some embodiments, the electronic device further includes an optical detection assembly configured to detect an ambient color temperature on a screen side, that is, an in-screen optical detection assembly, so that when the electronic device photographs a photo by using the front camera module, the photographing effect can be adjusted according to the ambient color temperature detected by the optical detection assembly, thereby improving imaging quality of the front camera module. 
     Referring to  FIG.  2   ,  FIG.  3    and  FIG.  4    together,  FIG.  2    is a front view of the electronic device in  FIG.  1   ,  FIG.  3    is a partial sectional view of the electronic device in  FIG.  2    in a direction A-A, and  FIG.  4    is a sectional view of a front camera module provided in an embodiment of the present application in the direction A-A. In this embodiment of the present application, the front camera module  400   b  includes an optical lens  410 , a photosensitive chip  420 , and a module circuit board  430 . An optical axis direction of the optical lens  410  is disposed in the z-axis direction. The module circuit board  430  is fixed to a light outlet side of the optical lens  410 . The module circuit board  430  may be electrically connected to the circuit board  300  by using the MIPI, so that signals can be transmitted between the circuit board  300  and the module circuit board  430 . The photosensitive chip  420  is fixed to one side of the module circuit board  430  facing the optical lens  410 , and the photosensitive chip  420  is electrically connected to the module circuit board  430 . An optical image generate by an object by using the optical lens is projected to the photosensitive chip  420 . The photosensitive chip  420  may be a charge coupled device (charge coupled device, CCD for short) or a complementary metal-oxide-semiconductor (complementary metal-oxide-semiconductor, CMOS for short) phototransistor. The photosensitive chip  420  can convert an optical signal into an electrical signal, and then transmit the electrical signal to the ISP by using the module circuit board  430  for conversion into a digital image signal. The ISP outputs the digital image signal to the DSP chip for processing. DSP converts the digital image signal into an image signal in a form such as standard RGB or YUV. 
     In some implementations, the front camera module  400   b  may further include an optical filter  440 , where the optical filter  440  is located on one side of the photosensitive chip  420  facing the optical lens  410 . The optical filter  440  may be configured to filter out stray light of the ambient light of the optical lens  410  and make the filtered ambient light propagate to the photosensitive chip  420 , thereby ensuring that the image photographed by the electronic device  1  can have better sharpness. 
     The light inlet side of the optical lens  410  is disposed toward the screen side  200  of the electronic device  1 . To facilitate installation of the front camera module  400   b  and make light from the screen  200  side propagate smoothly into the optical lens  410 , in a specific implementation, a through hole  113   b  is provided in the middle board  122  at a position corresponding to the front camera module  400   b,  an opening  221   b  is provided in the display  220  at a position corresponding to the through hole  113   b,  and the optical lens  410  of the front camera module  400   b  can pass through the through hole  113   b  and extend into the opening  221   b.  In this way, the ambient light can enter the optical lens after passing through the cover plate  210 . 
       FIG.  5    is a sectional view of an optical detection assembly provided in an embodiment of the present application in the direction A-A. Referring to  FIG.  3    and  FIG.  5    together, the optical detection assembly  500  includes a light sensor  10 , and the light sensor  10  may be a color temperature sensor for detecting an ambient color temperature, or an ambient light sensor for detecting an intensity of ambient light, or the like. The following is specifically described by using the light sensor  10  as a color temperature sensor, and the color temperature sensor and the light sensor  10  have the same reference numeral in the following. The color temperature sensor  10  may be disposed on the circuit board  300  and located on one side of the circuit board  300  facing the screen  200 , that is, the optical detection assembly  500  is located between the cover plate  210  and the circuit board  300 . In a specific embodiment, the color temperature sensor  10  may be disposed on the circuit board  300  through welding, so that on one hand, the color temperature sensor  10  can be fixed, and on the other hand, the electrical connection between the sensor  10  and the circuit board  300  can be easily achieved, so that the color temperature sensor  10  can transmit the detected signal to the circuit board  300 . For example, a pin of the color temperature sensor  10  may be directly welded to a corresponding electrical connection point on the circuit board  300 . 
     Similarly, to enable the ambient light on the screen  200  side to propagate to the color temperature sensor  10  smoothly, during design, a light-shielding structure between the color temperature sensor  10  and the cover plate  210  may alternatively be opened to form a path that allows light to propagate. Referring to  FIG.  3   , when the display  220  is a non-transparent display, the light-shielding structure between the color temperature sensor  10  and the cover plate  210  includes a middle board  112  and a display  220 . In a specific implementation, a through hole  113   a  is provided in the middle board  112  at a position corresponding to the color temperature sensor  10 , and an opening  221   a  is provided in the display  220  at a position corresponding to the through hole  113   a.  In this way, ambient light can be propagated to the color temperature sensor  10  after passing through the cover plate  210 , the opening  221   a,  and the through hole  113   a  in sequence. For ease of distinction, the two through holes in the middle board  112  corresponding to the color temperature sensor  10  and the optical lens are referred to as the first through hole  113   a  and the second through hole  113   b  respectively, and the openings in the display  220  corresponding to the first through hole  113   a  and the second through hole  113   b  are referred to as the first opening  221   a  and the second opening  221   b  respectively. 
     In some implementations, the first opening  221   a  and the second opening  221   b  may be disposed at intervals, that is, the first opening  221   a  and the second opening  221   b  are two separately arranged openings. In this way, when the electronic device is in use, two non-display regions are provided on the screen side, and the two non-display regions are regions in which the first opening  221   a  and the second opening  221   b  are located respectively. In specific arrangement, the first opening  221   a  and the second opening  221   b  may be adjacent, for example, the two may be adjacently disposed in a left region, a middle region, a right region, or the like at the top of the screen  200 . No specific limitation is imposed on this in the present application. 
     In some other implementations, the first opening  221   a  and the second opening  221   b  may alternatively communicate with each other to be a whole, that is, the first opening  221   a  and the second opening  221   b  communicate with each other to be one opening. In this way, when the electronic device is in use, only one non-display region is not displayed on the screen, and the shape of the non-display region is the shape after the first opening and the second opening communicate with each other. Specifically, the non-display region may be located at the top of the screen, such as a left region at the top of the screen shown in  FIG.  2   . Certainly, in some other possible implementations, the non-display region may be located in a central region or a right region at the top, and no limitation is imposed on this in the present application. The shape of the non-display region is not limited to only the long circle shown in  FIG.  2   . For example, the shape of the non-display region may alternatively be a rectangle, an oval, a circle, a water drop shape, or the like. 
     It should be noted that when the display  220  is a transparent display, no opening is required in the display  220  at a position corresponding to the first through hole. In this case, the ambient light can pass through the cover plate  210 , the transparent display  220 , and the first through hole  113   a  in sequence and then propagate to the color temperature sensor  10 . Similarly, no opening is required in the display  220  at a position corresponding to the second through hole  113   b,  the light inlet side of the optical lens of the front camera module  400   b  extends into the second through hole  113   b,  and the ambient light can enter the optical lens  410  after passing through the cover plate  210  and the transparent display  220  in sequence. The following is a detailed description of the process of detecting the ambient color temperature by using the color temperature sensor when the transparent display is adopted for the electronic device. 
     In this embodiment, after the electronic device enables a color temperature adjustment function or turns on a front camera, the electronic device controls a first region of the display corresponding to the first through hole to display a black image at least twice, and during the interval of two adjacent displays of the black image in the first region, the electronic device controls the first region to display image frames. When the black image is displayed in the first region, the electronic device obtain the ambient color temperature detected by the color temperature sensor. When the black image is displayed in the first region, the electronic device controls a second region other than the first region on the display to display image frames. 
     The black image may be an image that is presented when the display does not emit light. Alternatively, the black image may be a deep gray image when the display emits light, which may be approximately considered as a black image visually. In the present application, no limitation is imposed on the black image. 
     It should be noted that the electronic device usually uses a gray value to represent a color depth of points in a black-and-white image. Several levels are provided between white and black according to a logarithmic relationship, generally ranging from 0 to 255, where white is 255, and black is 0. Therefore, a black-and-white picture is also referred to a grayscale image. Therefore, the electronic device can control the gray value of the image displayed on the display to be less than or equal to a preset threshold, so that the electronic device displays a deep gray image, which may be approximately considered as a black image. 
     In other words, the electronic device can also control the display to display an image with a grayscale being dark gray, light black or black. Specifically, the electronic device divides a brightness change between brightest and darkest parts into several parts, to enable the electronic device to input corresponding screen brightness control. Generally, in visual interpretation, the grayscale may be roughly divided into seven levels: white, gray, light gray, gray, dark gray, light black, and black. 
     The image frames are a display interface presented by the electronic device to a user, and may include the interface or content specifically displayed to the user. 
     If a display frequency of the electronic device is f Hz, the electronic device can control the interval between two adjacent displays of a black image in the first region to be greater than or equal to 1/af second. If a black image is displayed periodically, a period of displaying the black image is 1/af second, that is, the interval between two adjacent displays of the black image is equal to 1/af second. a is a positive integer greater than or equal to 1. 
     a=1 and periodic display of a black image are used as an example for description. The period that the electronic device controls the first region to periodically display a black image is 1/f, that is, the frequency that the electronic device controls the first region to display the black image is the same as the display frequency of the electronic device. Within 1 second, the electronic device may display f image frames, and the black image may also be displayed for f times in the first region. It may be learned that the electronic device controls the first region of the display to display the black image once when displaying each of the f image frames. 
     It can be learned from the foregoing analysis that the electronic device can control the first region to display a black image once within a time during which each image frame is refreshed, and control the color temperature sensor to detect within a time during which the black image is displayed in the first region, so as to prevent light emitted by the display from interfering with the color temperature sensor and affecting accuracy of the detection result of the ambient color temperature by the color temperature sensor  10 . 
       FIG.  6    is a schematic structural diagram of an optical detection assembly provided in an embodiment of the present application. Referring to  FIG.  6   , in some implementations, the optical detection assembly  500  further includes a light shield body  20  with a hollow structure, where the light shield body  20  includes a first end  21  and a second end  22  that are opposite to each other. The hollow structure of the light shield body  20  can penetrate from the first end  21  to the second end  22 , and the hollow structure can form into a light hole  23  of the light shield body  20 . In specific arrangement, the first end  21  of the light shield body  20  is in contact with the circuit board  300 , and the color temperature sensor  10  is located in a region defined by the first end  21  of the light shield body  20  on the circuit board  300 . The second end  22  of the light shield body  20  passes through the first through hole  113   a  and the first opening  221   a  in sequence and extends to one side of the cover plate  210  facing the circuit board  300 . In this way, after passing through the cover plate  210 , the ambient light can be propagated to the color temperature sensor  10  through the light hole  23  inside the light shield body  20 . That is, a lower space of the light hole  23  can be used as an accommodating cavity for accommodating the color temperature sensor  10 , and an upper space of the light hole  23  can be used to guide light, so as to guide the ambient light on the screen side from the upper space of the light hole  23  to the color temperature sensor  10  in the lower space. A distance between the optical lens and the shield body of the optical detection assembly is less than 1 cm. 
     The light shield body  20  may be made of a material with good light-shielding performance, such as metal. Alternatively, the light shield body  20  may be made of a material with ordinary light-shielding performance or light transmission. After the light shield body is made and molded, light-shielding black glue layers, such as ink layers, are disposed on each surface of the shield body to enable the shield body to achieve the light-shielding function. For example, in some implementations, an inner surface, an outer surface, the first end  21  and the second end  22  of the light shield body  20  each may be provided with a light-shielding black glue layer. Certainly, to further improve the light-shielding performance of the light shield body  20 , in some implementations, each surface of the shield body made of a material with better light-shielding performance may alternatively be provided with a light-shielding black glue layer. Through the arrangement of the light shield body  20 , not only can a propagation path of ambient light be limited, but also the light inside the electronic device  1  (for example, light emitted by the display) can be blocked, so that the light inside the electronic device can be prevented from propagating to the color temperature sensor  10  and affecting accuracy of the detection result of the ambient color temperature by the color temperature sensor  10 . 
     In some implementations, the first end  21  of the light shield body  20  is hermetically connected to the circuit board  300 . In this way, on one hand, dust inside the electronic device  1  can be prevented from entering the light hole  23 , and a risk that the dust falling on the color temperature sensor  10  affects detection sensitivity of the color temperature sensor  10  is reduced; on the other hand, risks of light leakage and optical crosstalk at the first end  21  of the light shield body  20  can be reduced, and the light blocking effect of the light shield body  20  is improved, thereby further improving accuracy of the detection result by the color temperature sensor  10 . 
     In the foregoing solution, foam  30  may be disposed between the first end  21  of the light shield body  20  and the circuit board  300 , and the foam  30  is squeezed to achieve sealing. In specific arrangement, two sides of the foam  30  may be bonded to the light shield body  20  and the circuit board  300  respectively to improve structural reliability of the electronic device  1 . Alternatively, filling glue may be provided between the first end  21  of the light shield body  20  and the circuit board  300 , to achieve sealing through bonding. 
     In some implementations, a certain assembly gap s is provided between the second end  22  of the light shield body  20  and the cover plate  210 , that is, a gap is provided between a lower surface of the cover plate  210  and an upper surface of the second end  22 . An edge of the screen  200  is usually bonded and fixed to the frame body  111  of the middle frame  110  by using insulating gum. If the second end  22  of the light shield body  20  abuts against the cover plate  210 , a distance between the screen  200  and the middle frame  110  will tend to increase, and a bonding surface between the insulating gum and the screen  200  or the frame body  111  will have a risk of degumming, which will affect structural stability of the electronic device  1 . Through the arrangement of the assembly gap s, when the screen  200  is assembled with the middle frame  110 , the second end  22  of the light shield body  20  can be prevented from squeezing the cover plate  210 , thereby ensuring structural stability of the electronic device  1 . 
     In a specific implementation, the assembly gap s between the second end  22  of the light shield body  20  and the cover plate  210  may be 0.11 mm to 0.13 mm, for example, the assembly gap s may be 0.11 mm, 0.12 mm, or 0.13 mm. It has been verified by many experiments that when the assembly gap s is within the foregoing range, the electronic device  1  can be assembled reliably, and light emitted by the display  220  may be prevented from reaching the light hole  23  through the assembly gap s, thereby improving accuracy of the result of detection by the color temperature sensor  10 . 
     Understandably, when the electronic device uses a transparent display, the second end  22  of the light shield body  20  can pass through the first through hole  113   a  and extend to one side of the display  220  facing the circuit board  300 . In this case, a gap is provided between the upper surface of the second end  22  of the light shield body  20  and the lower surface of the display  220 , and for a specific value of this gap, reference may be made to the setting of the foregoing assembly gap. Details are not described herein. 
     With continued reference to  FIG.  3   ,  FIG.  5   , and  FIG.  6   , in this embodiment of the present application, the first end  21  of the light shield body  20  is further provided with an extension wall  24  disposed in a circumferential direction of the light shield body. The circumferential direction herein may be understood as a direction in which an outer wall surface of the first end  21  of the light shield body  20  extends. The shape of the first end  21  of the light shield body  20  is not limited, and may be, for example, a circle, a rectangle, a long circle, or other regular or irregular shapes. No limitation is imposed on this in the present application. When the light shield body  20  is installed in the electronic device  1 , the extension wall  24  may be specifically located between the middle board  112  and the circuit board  300 , and one side of the extension wall  24  facing the circuit board  300  is in sealing contact with the circuit board  300  by using the foam  30 , so as to increase the contact area between the light shield body  20  and the foam  30  and achieve better sealing. A step is formed on one side of the extension wall  24  facing the middle board  112 , and the side of the extension wall  24  facing the middle board  112  abuts against the middle board  112 , so as to position the light shield body  20  in the Z-axis direction. In addition, the side of the extension wall  24  facing the middle board  112  may alternatively be bonded to the middle board  112  by using gum, so that the light shield body  20  can be reliably fixed in the electronic device  1 . 
     In some implementations, the extension wall  24  specifically has a ring structure that can be disposed around the first end  21  of the light shield body  20 , and the shape of an inner ring of the extension wall  24  matches the shape of the first end  21  of the light shield body  20 . The shape of an outer ring of the wall  24  may be similar to the shape of the inner ring, or may be other shapes. No limitation is imposed on this in the present application. Through such an arrangement, the entire annular surface of the extension wall  24  may be bonded to the middle board  112  by using gum, so that the bonding area between the extension wall  24  and the middle board  112  can be increased, thereby increasing the connection strength between the light shield body  20  and the middle board  112 . 
     Understandably, when the color temperature sensor  20  is used to detect the color temperature, more and denser ambient light received by the color temperature sensor  20  indicates higher accuracy of the detection result. In different light source environments, angles of the light irradiated into the light hole  23  through the cover plate  210  are also different, and some light may directly irradiates an inner wall of the light hole  23  because an included angle between the incident angle and the axial direction of the light hole  23  (that is, the z-axis direction) is excessively large. This relatively reduces light propagated to the color temperature sensor  10  and is not conducive to obtaining accurate detection results by the color temperature sensor  10 . 
     Based on this, the optical detection assembly  500  may further include a lens  40  for converging ambient light. In a specific implementation, the lens  40  is disposed in the light hole  23  and near the second end  22  of the light shield body  20 . The lens  40  has a light inlet side and a light outlet side. When the lens  40  is installed in the light hole  23 , the light inlet side of the lens  40  is disposed toward the second end  22  of the light shield body  20 , and the light outlet side of the lens  40  is disposed toward the first end  21  of the light shield body  20 . Referring to  FIG.  7   , after entering the light hole  23  from the first end  21  of the light shield body  20 , the ambient light enters the lens  40  through the light inlet side  41  of the lens  40 . The lens  40  can adjust the ambient light in various incident directions to be approximately parallel to the axial direction of the light hole  23 , and then emit the ambient light from the light outlet side  42 , so that the light emitted from the light outlet side  42  of the lens  40  can propagate in the adjusted propagation direction to the color temperature sensor  10 , and then is collected by the color temperature sensor  10 . That is, through light converging action of the lens  40 , The lens can converge ambient light from each incident direction into a beam that propagates approximately in an axis direction of the light hole  23 , thereby increasing the density of ambient light propagating to the color temperature sensor  10 , and improving the accuracy of the detection result of the color temperature sensor  10 . 
     The lens  40  may be prepared from a resin, glass, or the like. In this embodiment of the present application, the lens  40  can transmit visible light in all bands. In this way, even if the light intensity of the ambient light changes after the ambient light passes through the lens  40 , the transmittance of the lens  40  for light of all colors can be kept consistent, that is, the transmittance of the lens  40  for visible light of all bands is the same, so that the color temperature of the light remains unchanged after the light passes through the lens  40 , thereby ensuring accuracy of the result of detection by the color temperature sensor  10 . 
     In this embodiment of the present application, the light shield body  20  may have a cylindrical structure with the shape similar to the shape of the optical lens  410 , for example, the second end  22  of the light shield body  20  may have a cylindrical structure. In this case, the lens disposed in the light shield body  20  is also similar to the lens in the optical lens  410 . On the screen  200  side of the electronic device  1 , the second end  22  of the light shield body  20  and the light inlet side of the optical lens  410  can be seen through the cover plate  210 . Based on the similar appearances of the light shield body  20  and the optical lens  410 , the second end  22  of the light shield body  20  and the lens  40  located in the light shield body  20 , which are seen by a user, are basically the same as the light inlet side of the optical lens  410 . That is, seen from the screen  200  side the optical detection assembly  500  is shaped like a camera, and therefore a visual effect of the appearance of the electronic device  1  can be optimized to a certain extent. 
     Referring to  FIG.  5    and  FIG.  6    together, in this embodiment, the light shield body  20  includes a first portion  25  and a second portion  26 . The first portion  25  of the light shield body  20  is disposed close to the first end  21  of the light shield body, and the second portion  26  is disposed close to the second end  22  of the light shield body. An outer contour of the first portion  25  exceeds that of the second portion  26 . In some implementations, the light shield body  20  has a cylindrical structure. In this case, the first portion  25  may be regarded as a first shaft segment, and the second portion  26  may be regarded as a second shaft segment. A diameter of the first shaft segment  25  is greater than a diameter of the second shaft segment  26 . It should be noted that the reference numerals of the first shaft segment and the second shaft segment are the same as those of the first portion  25  and the second portion  26 , respectively. 
     The light hole  23  may be correspondingly divided into a first hole segment  231  located in the first shaft segment  25  and a second hole segment  232  located in the second shaft segment  26 . A diameter of the first hole segment  231  is greater than a diameter of the second hole segment  232 . In this way, a stepped surface may be formed between the first hole segment  231  and the second hole segment  232 , and is denoted as the first stepped surface  233 , and the first stepped surface  233  is specifically disposed toward the first end  21  of the light shield body  20 . A diameter of one end of the lens  40  close to the light inlet side is less than a diameter of the other end thereof close to the light outlet side. Therefore, a stepped surface is also formed on a peripheral side of the lens  40 , and is denoted as the second stepped surface  41 , and the second stepped surface  41  is specifically disposed toward the second end  22  of the light shield body  20 . 
     Based on the foregoing structure, when the lens  40  is installed in the light hole  23 , one end of the light inlet side of the lens  40  extends into the second hole segment  232 , and the second stepped surface  41  of the lens  40  is opposite to the first stepped surfaces  233  in the light hole  23 . The two stepped surfaces are bonded to each other by using gum, so as to fix the lens  40  in the light hole  23 . 
     Referring to  FIG.  8   ,  FIG.  8    is another sectional view of an optical detection assembly provided in an embodiment of the present application. In some implementations, the light shield body  20  may have an asymmetric structure. In the z-axis direction, the first portion  25  of the light shield body includes an upper portion  251  and a lower portion  252 , where the upper portion  251  is disposed close to the second end  22  of the light shield body  20 , an outer contour of the upper portion  251  may be circular, and the upper portion  251  may be disposed coaxially with the second portion  26 ; the lower portion  252  is disposed close to the first end  21  of the light shield body  20 , and an outer contour of the lower portion  252  may be a long circle disposed in the y-axis direction. In this way, one side of the lower portion  252  (for example, the left side in  FIG.  8   ) extends beyond the upper portion  251 , so that a stepped surface may be formed on the peripheral side of the first portion  25 . With such a design, part of the hole segment of the light hole  23  corresponding to the lower portion  252  may also be designed as an oblong hole with an outer contour similar to that of the lower portion  252 , so as to accommodate the color temperature sensor  10 . 
     In some embodiments, the optical detection assembly  500  further includes a light homogenizing film  50 . The light homogenizing film  50  is fixed to the light outlet side of the lens  40 , and may be configured to convert light emitted from the light outlet side of the lens  40  into a surface light source, so that each photosensitive region of the color temperature sensor can receive uniform light with similar intensities, thereby improving the detection accuracy of the color temperature sensor. 
     When the light homogenizing film  50  is fixed to the lens  40 , an edge of the light homogenizing film  50  may be coated with an adhesive, and the light homogenizing film adheres to the edge of the light outlet side of the lens  40 . It should be noted that, to avoid blocking the light on the light outlet side, in some implementations, a transparent adhesive may be used for bonding between the light homogenizing film  50  and the lens  40 . 
     In addition, to facilitate the positioning of the light homogenizing film  50  on the lens  40 , in some implementations, the light outlet side of the lens  40  is further provided with a groove  43 , and a cross section of the groove  43  may be circular. In design, an axis of the groove  43  may coincide with an axis of the lens  40 . In this way, an annular boss  44  surrounding the groove  43  may be formed on the light outlet side of the lens  40 , and the light homogenizing film  50  may be fixed to the annular boss  44 . 
     In addition, because the light homogenizing film  50  is usually white, to prevent the screen side of the electronic device from appearing white in appearance, in this embodiment of the present application, the lens  40  may be made of a dark tone resin or glass, so that the color of the light homogenizing film  50  can be blocked, so as to improve appearance quality of the electronic device. It should be noted that the dark tone herein may be understood as some dark tones with colors close to or consistent with black, such as black tone, gray tone, or brown tone. In specific arrangement, the lens  40  may be brown, gray, black, black gray, or the like, and no limitation is imposed on this in the present application. When the lens  40  is dark, the lens  40  may be semitransparent, that is, the light transmittance is not 100%. 
     With reference to  FIG.  2    and  FIG.  3   , a process of adjusting the photographing effect of the front camera module by using the optical detection assembly is described in detail below. 
     When the electronic device  1  receives the user&#39;s front-facing photographing instruction, the CPU controls the color temperature sensor  10  to detect ambient light information on the screen  200  side, and then obtains, by using a related algorithm, the ambient color temperature on the screen  200  side according to the ambient light information detected by the color temperature sensor  10 . When the ambient color temperature is excessively low, for example, lower than a reference color temperature (a set color temperature during the design and production of the photosensitive chip of the front camera module, which is generally a standard color temperature), an image photographed by the front camera module  400   b  is reddish. In this case, the color temperature of the image photographed by the front camera module  400   b  may be increased, and a blue tone is added to the image to adjust the color of a photographed object, and then a photo with a normal color temperature is generated according to the adjusted color. When the ambient color temperature is excessively high, for example, higher than the reference color temperature, the image photographed by the front camera module  400   b  is bluish. In this case, the color temperature of the image photographed by the front camera module  400   b  may be lowered, and the red tone is added to the image to adjust the color of the photographed object, and then a photo with a normal color temperature is generated according to the adjusted color. 
     In addition, in some other possible implementations, the display color temperature of the screen  200  may alternatively be adjusted by using the color temperature sensor  10  to avoid the problem of color cast occurring when the screen  200  displays. The specific adjustment process is as follows: When the electronic device  1  receives an instruction to adjust the color temperature of the screen  200 , the CPU controls the color temperature sensor  10  to detect ambient light information on the screen  200  side, and then obtains, by using a related algorithm, the ambient color temperature on the screen  200  side according to the ambient light information detected by the color temperature sensor  10 . When the ambient color temperature is excessively low, for example, lower than the reference color temperature (the set color temperature during the design and production of the display, which is generally the standard color temperature), the display image of the screen  200  is reddish. In this case, the color temperature of the display image of the screen  200  may be increased, a blue tone is added to the image to adjust the display color of the screen  200 , and then the screen  200  is controlled to display according to the adjusted color. When the ambient color temperature is excessively high, for example, higher than the reference color temperature, the display image of the screen  200  is bluish. In this case, the color temperature of the display image of the screen  200  may be lowered, the red tone is added to the image, so as to adjust the display color of the screen  200 , and then the screen  200  is controlled to display according to the adjusted color. 
     The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and variations and replacements that may be easily conceived within the technical scope disclosed in the present application by any person skilled in the art should fall within the protection scope of the present application. The embodiments of the present application and features in the embodiments may be combined with each other without conflict. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.