Patent Publication Number: US-11030938-B2

Title: Display panel and display device

Description:
BACKGROUND OF INVENTION 
     Field of Invention 
     The present invention relates to the field of display technology, and more particularly, to a display panel and a display device. 
     Description of Prior Art 
     With continuous development of the mobile phone industry, mobile phone display panels has also continuously developed, and functions on display panels have also increased. Current mobile phone display panels have been widely provided with camera module. Since camera device needs to be spaced from display panel, an area available for disposing display panel is reduced, which is contrary to the current trend of increasing ratio of mobile phone display panels. Camera module is an essential component of current mobile phones. Therefore, how to integrate camera with display panel to maximize screen ratio is an urgent problem that needs to be solved. 
     Front camera of display panels is disposed on the outside of display panels. Therefore, display panels need to be sized to accommodate the front camera and a part of the whole device cannot normally be operated, and finally most mobile phones are only be shaped and cut to reduce screen ratio, which is not good to achieve full screen display devices. 
     SUMMARY OF INVENTION 
     It is an object of the present invention to provide a display panel and a display device that improve the quality of images on the screen and increase the screen ratio of the display panel to the display device. 
     In one embodiment, a display panel includes a first driving circuit and a plurality of first pixel units. The first pixel units include an image display region and a light transmissive region. The image display region is driven by the first driving circuit to provide a corresponding brightness. The light transmissive region is formed on the outside the image display region corresponding to the first pixel units, and thus an incident light emitted from an outer side of the display panel passes through the light transmissive region. 
     In another embodiment, a display device includes above-mentioned display panel, and the display device further includes a photosensitive element disposed inside the display panel, and the photosensitive element collects incident light emitted from outside the display panel through a plurality of the light transmissive regions of the display panel. 
     The first pixel unit of the display panel is divided into an image display region and a light transmissive region. The light transmissive region is formed outside the image display region, and thus an incident light emitted from an outer side of the display panel passes through the light transmissive region. Therefore, the photosensitive element is disposed on the back side of the display panel, that is the photosensitive element is disposed on a side of the display panel away from a light emitting surface of the display panel, so that the photosensitive element collects incident light emitted from outside the display panel through a plurality of the light transmissive regions formed by the first pixel unit of the display panel and performs image acquisition. Such a design enables the photosensitive element such as a camera to be integrated with the display screen, and does not need to reserve a space for the camera on the display panel, so that the screen ratio is maximized and the user experience is improved. In addition, the image display region of the display panel occupies most of the area of the display panel, and an opening is formed at edge of the image display region, and the light transmissive region is formed within the opening, and the light transmissive region of each image display region is not surrounded by the corresponding image display region. The space of image display region is fully utilized, thereby improving area of the light transmissive region, the light transmittance, and the image quality. The image display region also has a normal display function, so the reduction in pixel density (Pixels Per Inch, PPI) is limited. The present invention can improve the light transmittance of the light transmissive region while considering the pixel density. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings can also be obtained by persons skilled in the art based on these drawings, without making any creative effort. 
         FIG. 1  is a schematic view of an unpublished display panel according to one embodiment of the present invention. 
         FIG. 2  is a schematic cross-sectional view of a display panel according to one embodiment of the present invention. 
         FIG. 3  is a top view of a display panel according to one embodiment of the present invention. 
         FIG. 4  is a schematic view of a first driving circuit with a 2T1C architecture according to one embodiment of the present invention. 
         FIGS. 5-12  are various matching schematic views of a light transmissive region and an image display region according to one embodiment of the present invention. 
         FIG. 13  is a schematic view of a second driving circuit with a 7T1C architecture according to one embodiment of the present invention. 
         FIG. 14  is a plan view of a primary display region and an auxiliary display region according to one embodiment of the present invention. 
         FIG. 15  is a schematic view of a light transmissive combination region according to one embodiment of the present invention. 
         FIG. 16  is a schematic view of a light transmissive combination region according to another embodiment of the present invention. 
         FIG. 17  is a schematic view of a light transmissive combination region according to yet another embodiment of the present invention. 
         FIG. 18  is a schematic view of a distribution of a light transmissive combination region in a display panel according to one embodiment of the present invention. 
         FIG. 19  is a schematic view of a display device according to one embodiment of the present invention. 
         FIG. 20  is a schematic view of a display device according to another embodiment of the present invention. 
     
    
    
     ELEMENT REFERENCES 
     display panel  100 ; first substrate  111 ; second substrate  112 ; first pixel unit  120 ; image display region  121 ; light transmissive region  122 ; light transmissive combination region  123 ; opening  124 ; angular position  125 ; side position  126 ; first driving circuit  131 ; second driving circuit  132 ; display device  200 ; photosensitive element  140 ; second pixel unit  150 ; primary display region  160 ; auxiliary display region  170 ; active switch  180 ; and repeat unit  190 . 
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     It is understood that the terminology, the specific structural details, and the details of the present invention are used for the purpose of describing the specific embodiments and are representative, but the present invention can be embodied in many alternative forms and should not be construed as merely limited by the embodiments set forth herein. 
     In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only, and are not to be understood as indicating relative importance or implicitly indicating the number of technical features. Thus, unless otherwise indicated, a feature defining “first” or “second” may include one or more of the features either explicitly or implicitly, and “multiple” means two or more. The term “include” and its conjugations are intended to be inclusive, and may include or add one or more other features, integers, steps, operations, units, components, and/or combinations thereof. 
     In addition, the terms “center,” “transverse,” “upper,” “lower,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” are described based on the orientation or relative positional relationship shown in the drawings, and they are used for the convenience of describing the simplified description of the present invention rather than indicating that the device or component referred to have a particular orientation, or constructed and operated in a particular orientation. Therefore, it should not be construed as limiting the present invention. 
     In addition, the terms “mounted”, “attached”, and “connected” are used in a broad sense, and may be, for example, a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection, unless otherwise explicitly stated and defined. It can also be an electrical connection. It can be directly connected, or it can be connected indirectly through an intermediate medium, or it can be connected internally. For persons skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis. 
     The present invention is further described with accompanying drawings and embodiments. 
     The embodiments of the present invention are described by taking an organic light emitting diode display panel (OLED display panel) as an example, but the present invention is equally applicable to other display panels including liquid crystal display panels. 
       FIG. 1  shows an unpublished exemplary display panel  100 , including a plurality of first pixel units  120 , a light transmissive region  122  disposed between two adjacent image display regions  121  of the first pixel unit  120 , and the image display region  121  is driven to display by an active switch  130  of the first driving circuit  131 . Unless otherwise specified, the active switch  130  is described in the following embodiments by taking a thin film transistor as an example. 
     Referring to  FIG. 2  to  FIG. 4 , a display panel  100  includes a plurality of first pixel units  120  and a first driving circuit  131  driving the plurality of the first pixel units to provide a corresponding brightness. A light emitting surface of the display panel is considered as reference plane, and the first pixel units  120  include an image display region  121  and a light transmissive region  122 . The image display region  121  is driven by the first driving circuit  131  to provide a corresponding brightness and display image. An opening  124  is formed at an edge of the image display region  121 , the light transmissive region  122  is formed within the opening  124 , and an incident light emitted from an outer side M of the display panel passes through the light transmissive region. The light transmissive region  122  is not surrounded by the image display region  121  of the same first pixel units  120 , and a notch structure is formed at an edge of the corresponding image display region  121 . 
     A light emitting surface of the display panel  100  is considered as reference plane, and the first pixel units  120  of the display panel  100  are divided into the image display region  121  and the light transmissive region  122 . The light transmissive region  122  is formed outside the image display region  121 , so that an incident light emitted from an outer side of the display panel  100  can pass through. It allows a photosensitive element to be disposed behind the display panel  100 , that is, the photosensitive element is disposed on one side of the display panel  100 , away from a light emitting surface of the display panel  100 , so that the photosensitive element collects incident light emitted from outside the display panel  100  for image collection through a plurality of the light transmissive regions  122  formed on the first pixel units  120  of the display panel  100 . Such a design enables the photosensitive element, such as a camera, to be integrated with the display screen, without the need to reserve space for the camera on the display panel  100 , so that screen ratio is maximized and user experience is improved 
     In addition, the image display region  121  of the display panel  100  occupies most of area of the display panel  100 , and an opening is formed at an edge of the image display region  121 , and the light transmissive region  122  is formed within the opening. In comparison to the exemplary embodiment of  FIG. 1 , the light transmissive region  122  of each image display region  121  is not surrounded by the corresponding image display region  121  through forming the light transmissive region in the image display region  121 . Space of image display region  121  is fully utilized, thereby improving area of the light transmissive region  122 , the light transmittance, and the image quality. The image display region  121  also assumes normal display function, so reduction in pixel density (pixels per inch, PPI) is limited. The present invention can improve light transmittance of the light transmissive region while taking pixel density into consideration. Moreover, since each of the first pixel units  120  of the light transmissive region  122  are opened, the light transmissive regions  122  of the adjacent first pixel units  120  have a possibility of connecting to each other, so that the light transmissive regions  122  become larger after combining with each other. Such a design enables a photosensitive element, such as a camera, to have larger lighting window, and the transmitted light is more concentrated to facilitate better imaging. 
       FIG. 4  is a schematic view of a first driving circuit  131  with a 2T1C architecture according to one embodiment of the present invention. The 2T1C means that each of the first pixel units  120  is driven by two thin film transistors and one capacitor. Specifically, a first driving circuit includes an organic light emitting diode (OLED), a first thin film transistor T 1 , a second thin film transistor T 2 , and a capacitor Cs. A source of the first thin film transistor T 1  and a first terminal of the capacitor Cs are electrically connected to point a, and power supply positive voltage (VDD), which is typically generated and provided by a power generator of an organic light emitting diode display and not shown in the drawings. A gate of the first thin film transistor T 1 , a drain of the second thin film transistor T 2 , and a second terminal of the capacitor Cs are electrically connected to point b. A source of the second thin film transistor T 2  is electrically connected to a data voltage (DATA), and the gate is electrically connected to point c and a scan signal (SCAN). A drain of the first thin film transistor T 1  is connected to an anode of the organic light emitting diode (OLED), and a cathode of the organic light emitting diode (OLED) is electrically connected to a power source negative voltage (VSS), which is typically generated and provided by a power generator of the organic light emitting diode display and not shown in the drawings. 
     Referring to  FIG. 5  to  FIG. 12 , the edge of the image display region  121  includes an angular position  125  and a side position  126 . A notch  124  corresponding to the light transmissive region  122  may be disposed at the angular position  125  or the side position  126 . As shown in  FIG. 5  and  FIG. 6 , if the notch  124  corresponding to the light transmissive region  122  is disposed at the angular position  125 , it may be disposed at a single angular position  125  of the image display region  121 . As shown in  FIG. 7  and  FIG. 8 , there may also be two notches  124 , respectively disposed at two diagonal angular positions  125 . As shown in  FIG. 9  and  FIG. 10 , if the notch  124  corresponding to the light transmissive region  122  is disposed at the side position  126 , it may be disposed only at the side position  126  corresponding to a long side of the image display region  121 . As shown in  FIG. 11  and  FIG. 12 , there may also be two notches  124 , respectively disposed at side positions  126  corresponding to two long sides of the image display region  121 . 
     Referring to  FIG. 2 ,  FIG. 13 , and  FIG. 14 , the display panel  100  further includes a second pixel unit  150  and a second driving circuit  132 , and the second driving circuit  132  drives a plurality of the second pixel units  150  to provide a corresponding brightness, and the light transmissive region  122  is only formed within the first pixel units  120 . The second pixel units  150  are not provided with the light transmissive region  122 . 
     Generally, area of the photosensitive element is limited, and it is impossible to completely cover all of the display panel  100 . Therefore, the first pixel units  120  corresponding to the photosensitive element are merely provided with the light transmissive region  122 , and structure of the second pixel units  150  without the photosensitive element remains unchanged, and the corresponding image display region  121  is intact, which does not affect the aperture ratio and reduces the impact on pixel density (PPI, pixels per inch) of the display panel  100 . 
     Of course, the display panel  100  may also merely include the first pixel units  120  without the second pixel units  150 . That is, all pixel units of the display panel  100  are provided with the light transmissive region  122 . 
     The photosensitive element may also be disposed inside the display panel  100  and formed synchronously in manufacturing process of the display panel  100 . The photosensitive element may be individually disposed in the display panel  100 . Correspondingly, the first pixel units  120  are also individually disposed to form a plurality of auxiliary display regions  170  to increase lighting area and improve imaging quality. Since the first pixel units  120  are individually disposed, the photosensitive element has a plurality of lighting positions, and different positions of the same subject are used for lighting, which is similar to the technical solution of multi-camera imaging, and imaging quality can be improved by post-processing of software. 
     The first pixel units  120  may be relatively concentrated in a same region, that is, the auxiliary display region  170 . Under the premise of taking into account the effect of screen display, incident light passing through the outside of the display panel  100  is collected for the photosensitive element to be collected. The second pixel units  150  are also relatively concentrated in the same region, and are mainly used for screen display of the display panel  100 . The display panel  100  includes a primary display region  160  and the auxiliary display region  170 . The primary display region  160  is provided with the second pixel units  150 , and the auxiliary display region  170  is provided with the first pixel units  120 . Correspondingly, the photosensitive element of the display device  200  is correspondingly disposed in the auxiliary display region  170 . 
     The photosensitive element can be used as an independent component. The photosensitive element and the display panel  100  are integrated to achieve the function of under-screen camera. Therefore, the first pixel units  120  are concentrated in one region to form the auxiliary display region  170 , and incident light is collected by the auxiliary display region  170  to form image in the photosensitive element. 
     Of course, the auxiliary display region  170  may also include the first pixel units  120  and the second pixel units  150  at the same time, and the second pixel units  150  are uniformly distributed in the first pixel units  120 . 
     The number of active switches of the first driving circuit  131  driving the first pixel units  120  is less than the number of active switches of the second driving circuit  132  driving the second pixel units  150 . 
     Since the image display region  121  of the OLED display panel  100  adopts the organic light emitting diode, brightness of light is attenuated over time. Therefore, the OLED display panel  100  generally needs to be driven by a plurality of thin film transistors to perform brightness compensation on the organic light emitting diode. In order to form a light transmissive region in the auxiliary display region  170 , the thin film transistor of the auxiliary display region  170  may be reduced, and space of the light transmissive region is increased by simplifying circuit structure. 
       FIG. 13  is a schematic view of a second driving circuit  132  with a 7T1C architecture according to one embodiment of the present invention. The 2T1C means that each of second pixel units  150  is driven by seven thin film transistors and one capacitor. Specifically, the second driving circuit  131  includes an organic light emitting diode (OLED), a first thin film transistor T 1 , a second thin film transistor T 2 , a third thin film transistor T 3 , a fourth thin film transistor T 4 , a fifth thin film transistor T 5 , a sixth thin film transistor T 6 , a seventh thin film transistor T 7 , and a capacitor Cst. A gate electrode of the first thin film transistor T 1  is electrically connected to a first node g, a source of the first thin film transistor T 1  is electrically connected to a second node s, and a drain of the first thin film transistor T 1  is connected to a third node d. A gate electrode of the second thin film transistor T 2  is configured to receive a scan signal (Scan), a source of the second thin film transistor T 2  is configured to receive a data voltage (Vdata), and a drain of the second thin film transistor T 2  is connected to the first node g. A gate electrode of the third thin film transistor T 3  is configured to receive the scan signal (Scan), a source of the third thin film transistor T 3  is electrically connected to the first node g, and a drain of the third thin film transistor T 3  is electrically connected to the third node d. A gate electrode of the fourth thin film transistor T 4  is configured to receive a reset signal (Reset), a source of the fourth thin film transistor T 4  is configured to receive a reference voltage (Vref), and a drain of the fourth thin film transistor T 4  is electrically connected to the fourth node a. A gate electrode of the fifth thin film transistor T 5  is configured to receive the enable signal (Em), and a source of the fifth thin film transistor T 5  is configured to receive a power supply positive voltage (Vdd), which is usually generated and provided by a power generator (not shown) of an organic light emitting diode display device, and a drain of the fifth thin film transistor T 5  is connected to the second node s. 
     A gate electrode of the sixth thin film transistor T 6  is configured to receive the enable signal (Em), a source of the sixth thin film transistor T 6  is connected to the third node d, and a drain of the sixth thin film transistor T 6  is connected to an anode of the organic light emitting diode (OLED). A gate electrode of the seventh thin film transistor T 7  is configured to receive the enable signal (Em), a source of the seventh thin film transistor T 7  is connected to the fourth node a, and a drain of the seventh thin film transistor T 7  is connected to the first node g. A first terminal of the capacitor Cst is connected to the fourth node a, and a second terminal of the seventh thin film transistor T 7  is electrically connected to the second node s. A cathode of the organic light emitting diode (OLED) is configured to receive a power source negative voltage (Vss), which is typically generated and provided by the power generator (not shown) of the organic light emitting diode display device. 
     Of course, each first terminal of the first thin film transistor T 1  to the seventh thin film transistor T 7  may also be a drain, and second terminal of the first thin film transistor T 1  to seventh thin film transistor T 7  may be a source. 
     The first driving circuit and the second driving circuit may also adopt other circuit architectures such as 6T1C, 5T2C, etc., as long as the number of corresponding active switches of the first driving circuit is less than the number of active switches of the second driving circuit. 
     Referring to  FIG. 15  to  FIG. 17 , at least two of light transmissive regions  122  of the first pixel units  120  in the display panel  100  are adjacent to each other, and two adjacent light transmissive regions  122  are connected to form a light transmissive combination region  123 . Correspondingly, the periphery of the light transmissive combination region  123  is surrounded by at least two of image display regions  121  of the first pixel units  120 . The shape of the light transmissive combination region  123  may be a circle, a rectangle, a polygon, and other irregular shapes. According to different first driving circuits, different shapes of the first driving circuits can be chosen to ensure maximum light transmissive area. 
     Since the image display region  121  also has a display function, and light can pass through the image display region  121  during normal operation, which causes interference to the adjacent light transmissive region  122 . The external ambient light and the interference light emitted by the image display region  121  enter the light transmissive region  122 . An area of the light transmissive region  122  is too small, so the ambient light has a relatively small amount, and the influence of the interference on the image quality is relatively large. Therefore, a transmissive combination region  123  having a larger area is formed by combining the adjacent light transmissive regions  122 , and an amount of ambient light entering is increased, which is beneficial to offset influence of interference light and improves imaging effect. The light transmissive combination region  123  has various structural forms, which are exemplified below. 
       FIG. 15  shows a structure of a specific display panel  100 . An image display region  121  of first pixel units  120  includes a rectangular shape, a light transmissive region  122  is disposed at an angular position of the image display region  121 , and a light transmissive combination region  123  is formed by connecting at least two of the light transmissive regions having corresponding angular positions. 
     As shown in the figure, a repeating unit  190  is consisted of the plurality of first pixel units  120  in a group of four, four of the first pixel units  120  disposed within the repeating unit  190  are arranged in two columns, the first pixel units  120  are arranged in each column by two ways, that is, arranged in two rows crossing two columns (2×2), and each of the repeating units has a rectangular shape. Each of the first pixel units  120  has only one light transmissive region  122 . In the repeating unit  190 , four of the light transmissive regions  122  are connected to form the light transmissive combination region  123 , and the light transmissive combination region  123  is formed at a central position of four first pixel units  120  and surrounded by the image display regions  121  of the four first pixel units  120 . 
     The light transmissive combination region  123  is disposed in the middle region of each pixel. In each of the repeating units  190 , the light transmissive region having impact on display of each of the corresponding first pixel units  120  is equal, while each light transmissive combination region  123  having impact on the each of the corresponding the repeating units  190  is also equal. Thus, influence on display image quality is less. 
     Display colors corresponding to the four first pixel units  120  correspond to red, blue, and green colors, respectively, and the green color is attenuated, quickly. Each repeating unit  190  adopts two first pixel units  120  corresponding to the green color, which can compensate for the green color. 
     Of course, in the repeating unit  190 , the display colors corresponding to the four first pixel units  120  may be different, and the color mixing is better, so that the display effect is more delicate, but this is not necessary. It is even possible that the first pixel units  120  corresponding to the same color are arranged in a row or in a column, so that the first pixel units  120 , which may have only two colors, are formed in the repeating unit  190 . In addition, the repeating unit  190  may include more or even less of the first pixel units  120 , such as two, three, or even six, or even more. 
     Only one light transmissive region  122  is disposed in each of the first pixel units  120 , and each pixel unit has a rectangular shape, and the first pixel units  120  assume function of displaying image. Therefore, the light transmissive region  122  is disposed at an angular position of the first pixel units  120 , and the corresponding display effect is less affected. Furthermore, corner of each of the first pixel units  120  is adjacent to corner of three other first pixel units  120 , so that four corners of the light transmissive region  122  can be conveniently combined to form the light transmissive combination region  123 . When an area of the light transmissive combination region  123  is constant, an area of light transmissive region  122  is evenly distributed to each of the first pixel units  120  and can be minimized. Therefore, influence of the corresponding display effect is minimized. 
     Only one light transmissive combination region  123  is formed in each of the repeating units  190 , and a plurality of light transmissive combination regions  123  are respectively formed in the plurality of repeating units  190 , and the plurality of the light transmissive combination regions  123  are arranged in a matrix arranged in rows and columns. Excessive light transmissive combination regions  123  affect the display effect. Therefore, each of the repeating units  190  has only one light transmissive combination region  123 , and each of the repeating units  190  arranged in a matrix arranged in a row and row can better balance the contradiction between light transmission and display effect. 
     A shape of the light transmissive region  122  in each of the first pixel units  120  is a fan shape with a vertex angle of ninety degrees. Correspondingly, a shape of the light transmissive combination region  123  formed in each of the repeating units  190  is circular. Of course, the light transmissive combination region  123  can also be rectangular or other shapes. 
       FIG. 16  shows a structure of another specific display panel  100 . An image display region  121  of each first pixel units  120  corresponds to two light transmissive regions  122 , the two light transmissive regions  122  are respectively disposed at diagonal position of the image display region  121 , and each of the light transmissive regions  122  is connected to one or three adjacent other light transmissive regions  122  to form a light transmissive combination region  123 . Referring to the description of the above embodiment, four light transmissive regions  122  are combined to form the light transmissive combination region  123  in an intermediate region of an auxiliary display region  170 . An edge part of the auxiliary display region  170  is taken over by a primary display region  160 . In order to prevent impact on imaging quality of the primary display region  160 , it is only necessary to combine with the adjacent light transmissive regions  122 . More specifically, since there is only one image display region  121  at the four angular positions of the auxiliary display region  170 , it is not necessary to combine with other light transmissive regions  122 . 
     As seen from the drawing, the light transmissive combination regions  123  disposed in the middle of the auxiliary display region  170  are arranged in a straight line along scanning line direction of the display panel  100 , and the light transmissive combination regions  123  are staggered in data line direction of the display panel  100 . Due to staggered arrangement of the light transmissive combination regions  123 , there may be more light transmissive combination regions  123 , in the case an area of the auxiliary display region  170  is constant. Therefore, more ambient light can be collected, which further improves imaging configurations. 
       FIG. 17  shows a structure of another specific display panel  100 . An image display region  121  of first pixel units  120  includes a rectangular shape. The difference from the above embodiment is that a light transmissive region  122  is disposed at a side position of the image display region  121 , and a light transmissive combination region  123  is formed by connecting two of the transmissive regions  122  having corresponding side positions. 
     A repeating unit  190  is consisted of the plurality of first pixel units  120  in a group of four, four of the first pixel units  120  disposed within the repeating unit  190  are arranged in two columns, the first pixel units  120  are arranged in each column by two ways, that is, arranged in two rows crossing two columns (2×2), and each of the repeating units has a rectangular shape. Each of the first pixel units  120  has only one light transmissive region  122 , which is combined with the light transmissive region  122  of the first pixel units  120  disposed in the same row to form the light transmissive combination region  123 . Therefore, each of the repeating units  190  can have two light transmissive combination regions  123 . On the one hand, when the number of light transmissive combination regions  123  is increased, it is beneficial for increasing the amount of light transmission. On the other hand, it is also possible to reduce influence of interference light of an image display region in the same repeating unit  190  on ambient light, thereby improving imaging quality. 
       FIG. 18  is a simplified schematic plan view of the display panel. The light transmissive combination regions  123  are arranged in a straight line in a longitudinal direction and a transverse direction, and the adjacent two light transmissive combination regions  123  are equally spaced, and all of the light transmissive combination regions  123  are presented as a mesh shape. Meanwhile, the shape, size, number, and relative position of the combined light-transmitting region  123  can be arranged according to specific requirements of the amount of light transmission, and then the relevant circuit optimization is considered to obtain a better imaging effect. 
       FIG. 19  shows a display device  200  adopting the above display panel. The display device  200  further includes a photosensitive element  140  formed on outside of the display panel  100  and away from a light emitting surface of the display panel  100 . The photosensitive element  140  collects incident light emitted from outside the display panel  100  through the plurality of light transmissive regions  122  of the display panel  100 . 
     This is an external type of under-screen camera solution. The display panel  100  only needs to form the light transmissive regions  122 , and the process is relatively simple and lower cost. The photosensitive element  140  is directly attached to the outside of the display panel  100  to facilitate production. Specifically, the display panel  100  includes two substrates, and inner sides of the two substrates are oppositely disposed, and various display devices of the display panel  100  are disposed therein. A first substrate  111  corresponds to the light emitting surface, and if it is a liquid crystal display panel, a second substrate  112  corresponds to the light incident surface. If it is an OLED display panel, the second substrate  112  is a base, which can be transparent or opaque. The photosensitive element is attached to the outside of the second substrate  112 . 
       FIG. 20  shows a display device  200  adopting the above display panel. The display panel further includes the photosensitive element  140  disposed inside the display panel  100 , and the photosensitive element  140  collects incident light emitted from outside the display panel  100  through a plurality of the light transmissive regions  122  of the display panel  100 . 
     This is an internal type of under-screen camera solution, and the photosensitive element  140  is disposed inside the display panel, that is, the photosensitive element corresponds to the inside of the second substrate  112  of the display panel. Of course, if the pixel unit corresponding to the light transmissive regions  122  is disposed on the first substrate  111 , the photosensitive element  140  is disposed on the inside of the first substrate  111 . 
     The photosensitive element  140  is formed synchronously in the manufacturing process of the display panel, and the photosensitive element  140  can be individually disposed in the display panel. Correspondingly, the first pixel unit is also individually disposed to form a plurality of auxiliary display regions to increase lighting area and enhance imaging quality. Since the first pixel unit is individually disposed, the photosensitive element  140  has a plurality of lighting positions. Lighting of different positions of the same subject is similar to the technical solution of multi-camera imaging, and the post-processing of software can also improve imaging quality. 
     The technical solution of the present invention can be widely applied to various display panels, such as a twisted nematic (TN) type display panel, that is, a twisted nematic panel; an in-plane switching (IPS) type display panel, that is, a plane conversion display panel; and a multi-domain vertical alignment (VA) type display panel, that is, a multi-domain vertical alignment technology. Of course, the display panel can also be other types of display panels, such as an organic light emitting diode (OLED) display panel. 
     The present application has been further described in detail in the above preferred embodiments, but the preferred embodiments are not intended to limit the scope of the invention, and a person skilled in the art may make various modifications without departing from the spirit and scope of the application. The scope of the present application is determined by the claims.