Patent Publication Number: US-2023157116-A1

Title: Display panel and display device

Description:
BACKGROUND OF INVENTION 
     Field of Invention 
     The present disclosure relates to the field of display technology, specifically to a display panel and a display device. 
     Description of Prior Art 
     With the development of portable electronic devices (such as mobile phones, tablet computers, e-books, and navigation devices) industry, camera under panel (CUP) technology bringing better visual enjoyment and interference-free, all-around display has gradually become a development trend. 
     A current CUP display device refers to a display device that can display a position of a camera. By increasing light transmittance of a display area corresponding to the camera in a display panel (referred to as a camera area), the camera area can display screen content normally when not taking pictures; and when taking pictures, good light transmittance can meet lighting requirements of the camera. Due to high requirements for optical performance of the camera area, the prior art adopts a differentiated design method for a display panel area corresponding to the camera area to increase the light transmittance of the camera area, such as thinning or removing a light-shielding metal corresponding to the camera area. However, this will result in a difference between the camera area and a normal display area of the display panel. The difference is caused by the light-shielding metal shielding light emitted from pixels. Especially in the case of wide viewing angles, the difference will become more and more obvious. In order to decrease the display difference at wide viewing angles, an effective solution needs to be proposed. 
     SUMMARY OF INVENTION 
     The embodiments of the present disclosure provide a display panel and a display device thereof, which can reduce the display difference between the camera area and the conventional display area in the prior art, improve the overall display uniformity effect of the display panel and the display device, and enhance the user experience. 
     To solve the above problem, the present disclosure provides the following technical solution: 
     An embodiment of the present disclosure provides a display panel, wherein the display panel comprises: 
     An array substrate; 
     A plurality of pixel units disposed on the array substrate, and each of the pixel units comprises: an anode, a light-emitting portion, and a cathode that are sequentially stacked; 
     An encapsulation layer disposed on the plurality of pixel units; and 
     A touch layer disposed on the encapsulation layer, 
     Wherein the display panel comprises a first display area and a second display area disposed adjacent to the first display area, and a light transmittance of the touch layer in the first display area is less than a light transmittance of the touch layer in the second display area; and 
     In the first display area, the plurality of pixel units comprise first pixel units and second pixel units, and a minimum distance between an edge of an anode of at least one of the second pixel units and an edge of a corresponding light-emitting portion is greater than a minimum distance between an edge of an anode of each of the first pixel units and an edge of a corresponding light-emitting portion. 
     Alternatively, the anode of each of the pixel units comprises a first portion overlapping with the light-emitting portion and a second portion disposed around the first portion, a minimum width of the second portion corresponding to each of the first pixel units is a first width, a minimum width of the second portion corresponding to each of the second pixel units is a second width, and the second width of at least one of the second pixel units is greater than all the first widths. 
     Alternatively, the second widths of all the second pixel units are greater than the first widths of all the first pixel units, or, 
     The second width of at least one of the second pixel units is greater than all of the first widths, and the second widths of the other second pixel units are equal to a largest first width. 
     Alternatively, the second portion of each of the first pixel units forms a first annular portion, and a difference between a maximum width and a minimum width of the first annular portions is a; the second portion of each of the second pixels forms a second annular portion, and a difference between a maximum width and a minimum width of the second annular portions is b; wherein 0 μm≤a≤0.1 μm; b≥0 μm. 
     Alternatively, a pattern delineated by the edge of the anode of each of the first pixel units is same as a pattern delineated by the edge of the light-emitting portion of the first pixel unit; and a pattern delineated by the edge of the anode of each of the second pixel units is same or different from a pattern delineated by the edge of the light-emitting portion of the second pixel unit. 
     Alternatively, the first pixel units and the second pixel units emit light of different colors, and areas of the light-emitting portions of the first pixel units are greater than areas of the light-emitting portions of the second pixel units. 
     Alternatively, in the second pixel units, a ratio of an area of the second portion of the anode to a total area of the anode is greater than or equal to 47.16%. 
     Alternatively, the first width of each of the first pixel units is same, the second width of each of the second pixel units is same, and a difference between the second width and the first width is greater than or equal to 0.1 μm. 
     Alternatively, the first pixel units comprise red pixel units and/or blue pixel units, and the second pixel units comprise green pixel units. 
     Alternatively, in the second display area, the plurality of pixel units comprise third pixel units that emit light of a same color as the first pixel units and fourth pixel units that emit light of a same color as the second pixel units, wherein, 
     A minimum width of the second portion of each of the third pixel units is a third width, a minimum width of the second portion of each of the fourth pixel units is a fourth width, and the first width, the third width, and the fourth width are all less than the second width. 
     Alternatively, a pattern delineated by an edge of an anode of each of the third pixel units is same as a pattern delineated by an edge of a light-emitting portion of the third pixel unit; and a pattern delineated by an edge of an anode of each of the fourth pixel units is same as a pattern delineated by an edge of a light-emitting portion of the fourth pixel unit. 
     Alternatively, the third width is same as the fourth width. 
     Alternatively, the touch layer is defined with an opening at a position corresponding to the second display area, and a density of the pixel units in the second display area is same as a density of the pixel units in the first display area. 
     Alternatively, an area of the light-emitting portion of each of the third pixel units is less than an area of the light-emitting portion of each of the first pixel units, and an area of the light-emitting portion of each of the fourth pixel units is less than an area of the light-emitting portion of each of the second pixel units. 
     Correspondingly, the present disclosure further provides a display device, wherein the display device comprises a camera and a display panel, and the camera is disposed on a side of the display panel corresponding to a second display area, wherein the display panel comprises: 
     An array substrate; 
     A plurality of pixel units disposed on the array substrate, and each of the pixel units comprises: an anode, a light-emitting portion, and a cathode that are sequentially stacked; 
     An encapsulation layer disposed on the plurality of pixel units; and 
     A touch layer disposed on the encapsulation layer, 
     Wherein the display panel comprises a first display area and the second display area disposed adjacent to the first display area, and a light transmittance of the touch layer in the first display area is less than a light transmittance of the touch layer in the second display area; and 
     In the first display area, the plurality of pixel units comprise first pixel units and second pixel units, and a minimum distance between an edge of an anode of at least one of the second pixel units and an edge of a corresponding light-emitting portion is greater than a minimum distance between an edge of an anode of each of the first pixel units and an edge of a corresponding light-emitting portion. 
     Alternatively, the anode of each of the pixel units comprises a first portion overlapping with the light-emitting portion and a second portion disposed around the first portion, a minimum width of the second portion corresponding to each of the first pixel units is a first width, a minimum width of the second portion corresponding to each of the second pixel units is a second width, and the second width of at least one of the second pixel units is greater than all the first widths. 
     Alternatively, the second widths of all the second pixel units are greater than the first widths of all the first pixel units, or, 
     The second width of at least one of the second pixel units is greater than all of the first widths, and the second widths of the other second pixel units are equal to a largest first width. 
     Alternatively, the first pixel units and the second pixel units emit light of different colors, and areas of the light-emitting portions of the first pixel units are greater than areas of the light-emitting portions of the second pixel units. 
     Alternatively, the first pixel units comprise red pixel units and/or blue pixel units, and the second pixel units comprise green pixel units. 
     Alternatively, in the second display area, the plurality of pixel units comprise third pixel units that emit light of a same color as the first pixel units and fourth pixel units that emit light of a same color as the second pixel units, wherein, 
     A minimum width of the second portion of each of the third pixel units is a third width, a minimum width of the second portion of each of the fourth pixel units is a fourth width, and the first width, the third width, and the fourth width are all less than the second width. 
     The display panel and the display device provided by the present disclosure set a minimum distance between the edge of the anode of at least one second pixel unit of the plurality of pixel units in the first display area and the edge of the corresponding light-emitting portion to be greater than a minimum distance between the edge of the anode of each of the first pixel units and the edge of the corresponding light-emitting portion of the first pixel unit, which increases amount of light output from the first display area in wide viewing angles, improves consistency of display effects of the first display area and the second display area, improves display effect of the display panel in the wide viewing angles, and prevents problems of reducing user experience caused by differences in brightness of the display panel in the wide viewing angles. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       In order to more clearly explain the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those skilled in the art, without paying any creative work, other drawings can be obtained based on these drawings. 
         FIG.  1    is a top view of a display panel provided by a first embodiment of the present disclosure. 
         FIG.  2    is a front view of the display panel provided by the first embodiment of the present disclosure. 
         FIG.  3    is a schematic structural diagram of anodes and light-emitting portions of pixel units of a first display area provided by the first embodiment of the present disclosure. 
         FIG.  4    is a schematic structural diagram of the pixel unit provided by the first embodiment of the present disclosure. 
         FIG.  5    is a schematic structural diagram of anodes and light-emitting portions of pixel units of a second display area provided by the first embodiment of the present disclosure. 
         FIG.  6    is a schematic structural diagram of the anodes and the light-emitting portions of the pixel units of the first display area and the second display area provided by the first embodiment of the present disclosure. 
         FIG.  7    is a schematic structural diagram of anodes and light-emitting portions of pixel units of a first display area provided by a second embodiment of the present disclosure. 
         FIG.  8    is a schematic structural diagram of anodes and light-emitting portions of pixel units of a first display area provided by a third embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Technical solutions in embodiments of the present disclosure will be clearly and completely described below in conjunction with drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present disclosure. In addition, it should be understood that the specific implementations described here are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure. In the present disclosure, unless otherwise stated, directional words used such as “upper” and “lower” generally refer to the upper and lower directions of the device in actual use or working state, and specifically refer to the drawing directions in the drawings; and “inner” and “outer” refer to the outline of the device. 
     An embodiment of the present disclosure provides a display panel and a display device. Detailed descriptions are given below. It should be noted that an order of description in the following embodiments is not meant to limit the preferred order of the embodiments. 
     The present disclosure provides a display panel and a display device. The display panel comprises an array substrate; a plurality of pixel units disposed on the array substrate, wherein each pixel unit comprises an anode, a light-emitting portion, and a cathode that are stacked in sequence; an encapsulation layer disposed on the plurality of pixel units; a touch layer disposed on the encapsulation layer; wherein, the display panel is provided with a first display area and a second display area adjacent to the first display area, and a light transmittance of the touch layer in the first display area is less than a light transmittance of the touch layer in the second display area; in the first display area, the plurality of pixel units comprise first pixel units and second pixel units, and a minimum distance between an edge of an anode of at least one of the second pixel units and an edge of a corresponding light-emitting portion is greater than a minimum distance between an edge of an anode of the first pixel units and an edge of a corresponding light-emitting portion. In the display panel and the display device provided by the present disclosure, in the first display area, by setting the minimum distance between the edge of the anode of at least one of the second pixel units of the plurality of pixel units and the edges of the corresponding light-emitting portions to be greater than the minimum distance between the edges of the anodes of the first pixel units and the edges of the corresponding light-emitting portions, anode areas of at least part of the second pixel units are additionally increased, and the increased anode areas of the second pixel units can be configured to reflect light generated by the corresponding second pixel units, which increases amount of light output from the first display area at wide viewing angles, improves consistency of display effects of the first display area and the second display area, improves display effect of the display panel in the wide viewing angles, and prevents problems of compromising user experience caused by differences in brightness of the display panel at wide viewing angles. 
     A First Embodiment 
       FIG.  1    is a top view of a display panel provided by a first embodiment of the present disclosure;  FIG.  2    is a front view of the display panel provided by the first embodiment of the present disclosure; and  FIG.  3    is a schematic structural diagram of anodes and light-emitting portions of pixel units of a first display area provided by the first embodiment of the present disclosure. As shown in  FIGS.  1 - 3   , the first embodiment of the present disclosure provides a display panel, a type of which is, for example, an organic light-emitting diode (OLED) display panel. The display panel comprises an array substrate  10 , a pixel layer  20 , an encapsulation layer  30 , and a touch layer  40  stacked in sequence. The display panel is provided with a first display area  11  and a second display area  12  that are arranged adjacent to each other. Specifically, the display panel is provided with one first display area  11  and one second display area  12 , and the first display area  11  is disposed around the second display area  12 . In other embodiments of the present disclosure, the second display area  12  may be further disposed on one or more sides of the first display area  11 , and there can be one or more second display area  12 . 
     The array substrate  10  comprises, for example, an array substrate body and a pixel driving circuit disposed on the array substrate body. The array substrate body may be a flexible substrate or a rigid substrate, and materials thereof comprise one or more of glass, plastic, silicon dioxide, polyethylene, polypropylene, polystyrene, polylactic acid, polyethylene terephthalate, polyimide, or polyurethane. 
     The pixel layer  20  is disposed on the array substrate  10  and comprises a multi-layer structure. Specifically, the pixel layer  20  comprises, for example, an anode layer, an organic light-emitting layer, and a cathode layer. Wherein, the anode layer in the pixel layer  20  is composed of, for example, an opaque material, which can reflect light directed to the anode layer. For example, the anode layer is composed of three laminated layers of transparent conductive layer, silver, and transparent conductive layer. The transparent conductive layer is made of, for example, an indium tin oxide (ITO) material, and the anode layer comprises a plurality of anodes that are patterned and arranged at intervals. For example, a pixel defining layer is further disposed on the anode layer and is provided with pixel defining openings corresponding to positions of the plurality of anodes. The organic light-emitting layer in the pixel layer  20  is disposed on the pixel defining layer and comprises a plurality of light-emitting portions patterned and arranged at intervals, and the plurality of light-emitting portions are correspondingly disposed in the pixel defining openings on the plurality of anodes. The cathode layer is disposed on the organic light-emitting layer, and the cathode layer is, for example, a silver metal film, which has a semi-transmissive and semi-reflective optical effect. A plurality of pixel units  21  are disposed in the first display area  11 , and the plurality of pixel units  21  in the first display area comprise a plurality of first pixel units  22  and a plurality of second pixel units  23 , and a minimum distance between an edge of an anode of at least one of the second pixels  23  and an edge of a corresponding light-emitting portion is greater than a minimum distance between edges of anodes of the first pixel units and an edge of a corresponding light-emitting portion. In the present disclosure, anode areas of at least part of the second pixel units are additionally increased, and the increased anode areas of the second pixel units can be configured to reflect light generated by the corresponding second pixel units, which increases an amount of light output from the first display area in the wide viewing angles, increases brightness of light, and increases light output angles of the second pixel units at wide viewing angles, improves consistency of display effects of the first display area and the second display area, improves display effect of the display panel in the wide viewing angles, and prevents problems of compromising user experience caused by differences in brightness of the display panel at wide viewing angles. 
     The encapsulation layer  30  is disposed on the pixel layer  20  and configured to ensure sealing effect of the pixel units  21  in the pixel layer  20 , in order to prevent water vapor and oxygen from entering and corroding the pixel units  21 . 
     The touch layer  40  is disposed on the encapsulation layer  30 , and the touch layer  40  is defined with an opening  41  at a position corresponding to the second display area  12 , i.e., no touch electrode is directly disposed in the second display area  12 . Touch electrodes of the touch layer  40  may adopt a metal mesh structure. Specifically, the touch layer  40  does not block the pixel units  21  on the first display area  11  when viewed from front, but the metal mesh structure will reflect and block light emitted by the pixel unit  21  at wide viewing angles. Therefore, the second display area  12  has a higher light output rate than the first display area  11  at wide viewing angles. Of course, in other embodiments, the touch control layer  40  located at a position corresponding to the second display area  12  may also be other designs that can increase the light transmittance of the second display area  12  so that the touch layer  40  is in the first display area  11  and the second display area  12  have different light output rates. For example, a material of the touch layer  40  corresponding to the second display area  12  adopts transparent wires with a higher light transmittance, which is not limited in this embodiment. 
       FIG.  4    is a schematic structural diagram of the pixel unit provided by the first embodiment of the present disclosure. As shown in  FIG.  2   ,  FIG.  3   , and  FIG.  4   , the pixel layer  20  comprises a plurality of pixel units  21 , the plurality of pixel units  21  are distributed in the first display area  11  and the second display area  12 . Each pixel unit  21  comprises an anode  210 , a light-emitting portion  211 , and a cathode  212  stacked in sequence. The anode  210  of each pixel unit  21  comprises a first portion overlapping the light-emitting portion  211  and a second portion surrounding the first portion. That is, an area of the first portion is equal to a projection area of the light-emitting portion  211  on the array substrate  10  (that is, an area corresponding to a projection of a dotted line portion on the array substrate  10 ). A distance between an edge of the anode  210  of each of the pixel units  21  and an edge of a corresponding light-emitting portion  211  is W, wherein the pixel units  21  comprise first pixel units  22  and second pixel units  23  located in the first display area, and the first pixel units  22  and the second pixel units  23  are both provided in multiples. A minimum width of a second portion  221  corresponding to each first pixel unit  22  is a first width W 1 , a minimum width of a second portion  231  corresponding to each second pixel unit  23  is a second width W 2 , and the second width W 2  of at least one of the second pixel units  23  is greater than all the first widths W 1 . Specifically, the second widths W 2  of all the second pixel units  23  are greater than the first widths W 1  of all the first pixel units  22 , i.e., the second width W 2  of the second portion  231  of any second pixel unit  23  is greater than all the first widths W 1 . 
     In this embodiment, the second portion  221  of each of the first pixel units  22  forms a first annular portion, and a difference between a maximum width and a minimum width of the first annular portions is defined as a; the second portion of each of the second pixels forms a second annular portion, and a difference between a maximum width and a minimum width of the second annular portions is defined as b, wherein 0≤a≤0.1 μm; b≥0 μm. That is, the second portions  221  of the first pixel units  22  are annular areas with a fixed width difference interval, and the second portions  231  of the second pixel units  23  are annular areas with a fixed width difference interval, or annular areas with a non-fixed width difference interval. Preferably, in this embodiment, the second portions  231  of the second pixel units  23  are also annular areas with a fixed width difference interval. In order to accommodate process errors, the difference value between the maximum width and the minimum width of the annular areas is greater than or equal to 0 and less than or equal to 0.1 μm. Of course, no limitation is set on the width difference interval of the annular portions of the first pixel units  22  in the present disclosure, and in other embodiments, the width difference may be greater than or equal to 0.1 μm. 
     Further, a pattern delineated by edges of the anodes of the first pixel units  22  is same as a pattern delineated by edges of the light-emitting portions of the first pixel units  22 . A pattern delineated by the anode edge of each of the second pixel units  22  is same as a pattern delineated by the edge of the light-emitting portion of the second pixel unit  22 , and the pattern is, for example, a circle. In other embodiments of the present disclosure, the pattern may be an oval, a diamond, a triangle, a pearl, other polygons, or any irregular shape, and specific shapes thereof can be adaptively set according to actual needs. No limitation is set herein in this embodiment. It should be noted that when the pattern of the edges of the anodes of the pixel units (including the first pixel units and the second pixel units) and the pattern of the edges of the corresponding light-emitting portions are same, the minimum width and the maximum width of the second portion corresponding to each of the first pixel units may both be the first width, and the minimum width and the maximum width of the second portion corresponding to each of the second pixel units may both be the second width. 
     In this embodiment, the pixel units  21  of the first display area  11  comprise red pixel units, green pixel units, and blue pixel units. The red pixel units may be pixel units of the light-emitting portions  211  that directly emit red light; the green pixel units may be pixel units of the light-emitting portions  211  that directly emit green light; and the blue pixel units may be pixel units of the light-emitting portions  211  that directly emit blue light. 
     In this embodiment, the first pixel units  22  comprise red pixel units and/or blue pixel units; and the second pixel units  23  comprise green pixel units. For example, the second pixel units  23  are green pixel units, and the first pixel units are red pixel units and blue pixel units. Since the green pixel units have the highest luminous efficiency, by setting a minimum width of second portions of anodes of the green pixel units in the first display area  11  greater than a minimum width of second portions of anodes of the red pixel units and the blue pixel units in the first display area  11 , it can more efficiently increase brightness of the second display area  12  and can eliminate differences in brightness between the first display area  11  and the second display area  12  in wide viewing angles. Of course, in other embodiments of the present disclosure, the pixel units  21  may also comprise white pixel units. In this case, the second pixel units  23  may be white pixel units and/or green pixel units. 
     In this embodiment, sizes of the light-emitting portions of the pixel units  21  of a same color on the first display area  11  of the display panel are all same, and sizes of the light-emitting portions of the pixel units  21  of different colors are all different. Colors of the second pixel units  23  are different from the colors of the first pixel units  22 , and areas of the light-emitting portions  222  in the first pixel units  22  are greater than areas of the light-emitting portions  232  in the second pixel units  23 . Since the light-emitting portions  232  of the second pixel units  23  have smaller areas, when the second pixel units  23  aim to obtain the second widths W 2  greater than the first widths W 1 , the anodes of the second pixel units  23  can have larger external expansion areas without affecting adjacent pixel units thereof. Preferably, the second pixel units  23  are green pixel units, the first pixel units are red pixel units and blue pixel units, areas of the light-emitting portions of the red pixel units are largest, areas of the light-emitting portions of the blue pixel units are second largest, and areas of the light-emitting portions of the green pixel units are smallest. That is, the second pixel units  23  have higher luminous efficiency than the first pixel units  22 , and the second widths W 2  thereof can be set greater. Preferably, a difference between the second width W 2  and the first width W 1  is greater than or equal to 0.1 μm. 
     In this embodiment, a ratio of the second portion  231  of the anode in each of the second pixel units  23  to a total area of the anode in the second pixel unit  23  is greater than or equal to 47.16% (for example: 50%, 55%, 60%, 65%, 70%, etc.). Preferably, the minimum width (i.e., the first width W 1 ) of the second portion  221  of the anode in each of the first pixel units  22  is same, and the minimum width (i.e., the second width W 2 ) of the second portion  231  of the anode in each of the second pixel units  23  is same, and the difference between the first width W 1  and the second width W 2  is greater than or equal to 0.1 μm. This embodiment does not limit sizes of the anode and the light-emitting portion  222  of each first pixel unit  22  and sizes of the anode and the light-emitting portion  232  of each second pixel unit  23 . The plurality of first pixel units  22  may comprise a plurality of anodes of different sizes and a plurality of light-emitting portions  222  of different sizes; and the plurality of second pixel units  23  may also comprise a plurality of anodes of different sizes and a plurality of light-emitting portions  232  of different sizes. 
       FIG.  5    is a schematic structural diagram of anodes and light-emitting portions of the pixel units in the second display area provided by the first embodiment of the present disclosure; and  FIG.  6    is a schematic structural diagram of the anodes and the light-emitting portions of the pixel units in the first display area and the second display area provided by the first embodiment of the present disclosure. As shown in  FIGS.  1 - 6   , in this embodiment, the pixel units  21  comprise third pixel units  24  that emit light of the same color as the first pixel units  22  and fourth pixel units  25  that emit light of the same color as the second pixel units  23  in the second display area  12  of the display panel. For example, in this embodiment, the third pixel units  24  are red pixel units and blue pixel units, and the fourth pixel units  25  are green pixel units. A minimum width of a second portion  241  of an anode of each of the third pixel units  24  is a third width W 3 , a minimum width of a second portion  251  of an anode of each of the fourth pixel units  25  is a fourth width W 4 , and the third width W 3  and the fourth width W 4  are less than the second width W 2 . Preferably, the third width W 3  and the fourth width W 4  are same and less than the first width W 1 , and the second width W 2  is greater than the first width W 1 . Therefore, the anodes of the second pixel units of the first display area  11  can reflect more light generated by the corresponding second pixel units, so that the amount of light output from the first display area at wide viewing angles is increased, the brightness of light is increased, and light output angles of the second pixel units at wide viewing angles are increased, thereby improving the consistency of the display effects of the first display area and the second display area, improving the display effect of the display panel at wide viewing angles, and preventing the user experience from being compromised due to differences in brightness of the display panel at wide viewing angles. 
     In this embodiment, the second portion  241  of each third pixel unit  24  forms a third annular portion, and the second portion  251  of each fourth pixel unit  25  forms a fourth annular portion. A difference between a maximum width and a minimum width of the third annular portions and the fourth annular portions is defined as a, wherein 0≤a≤0.1 μm; that is, the second portion  241  of each third pixel unit  24  and the second portion  251  of each fourth pixel unit  25  are annular areas of fixed width difference interval. Of course, the present disclosure does not limit a margin of width difference of the annular portions of the third pixel units  24  and a margin of width difference of the annular portions of the fourth pixel units  25 . In other embodiments, the margin of width difference may be greater than 0.1 μm. 
     Further, a pattern formed by an edge of an anode of each of the third pixel units  24  is same as a pattern formed by an edge of a light-emitting portion of the third pixel unit  24 , and a pattern of an edge of an anode of each of the fourth pixel units  25  is same as a pattern of an edge of a light-emitting portion of the fourth pixel unit  25 , for example, a circle. In other embodiments of the present disclosure, the pattern may also be an oval, a diamond, a triangle, a pearl, other polygons, or any irregular shape, and specific shapes of which may be adaptively set according to actual needs and is not limited here by this embodiment. 
     In this embodiment, densities of pixel units in the first display area  11  and the second display area  12  of the display panel are same, i.e., a number of pixel units in a unit area is fixed. Specifically, each pixel unit corresponds to a fixed unit area. Further, the first pixel units  22  of the first display area  11  are red pixel units and blue pixel units, the second pixel units  23  of the first display area  11  are green pixel units. The third pixel units  24  of the second display area  12  are red pixel units and blue pixel units, and the fourth pixel units  25  of the second display area  12  are green pixel units. The light-emitting portions  211  of the pixel units of a same color in the first display area  11  are all same in size, and the light-emitting portions  211  of the pixel units of same color in the second display area  12  are all same in size. Wherein, the size of the red pixel units in the first display area  11  is greater than the size of the red pixel units in the second display area  12 ; the size of the green pixel units in the first display area  11  is greater than the size of the green pixel units in the second display area  12 ; and the size of the blue pixel units in the first display area  11  is greater than the size of the blue pixel units in the second display area  12 . Further, the pixel units of a same color in the first display area  11  have a same size, and the pixel units of different colors have different sizes; the pixel units of a same color in the second display area  12  have a same size, and the pixel units of different colors have different sizes. It should be noted that since the cathodes of the pixel units are generally disposed on an entire surface, when comparing sizes of two pixel units, only the sizes of the anodes and the light-emitting portions in the two pixel units are compared. That is, when the pixel unit  21  of the first display area  11  is greater than the pixel unit  21  of a same color of the second display area  12 , the area of the anode of the second pixel unit  23  is greater than the area of the anode of the fourth pixel unit  25  of a same color, and the area of the anode of the first pixel unit  22  is greater than the area of the anode of the third pixel unit  24  of a same color; and the area of the light-emitting portion  232  of the second pixel unit  23  is greater than the area of the light-emitting portion  252  of the fourth pixel unit  25  of a same color, and the area of the light-emitting portion  222  of the first pixel unit  22  is greater than the area of the light-emitting portion  242  of the third pixel unit  24  of a same color. Moreover, since the area of the light-emitting portion of the pixel unit of each color in the second display area is less than the area of the light-emitting portion of the pixel unit of a corresponding color in the first display area, the brightness of the pixels of the second display area  12  is less, and an effect of eliminating differences in brightness of the first display area  11  and the second display area  12  can be achieved. 
     In this embodiment, an arrangement manner of the pixel units  21  in the first display area  11  of the display panel is, for example, a diamond pixel arrangement manner or a delta pixel arrangement manner, or a pearl pixel arrangement manner or a two-in-one pixel arrangement manner, etc.; and an arrangement manner of the pixel units  21  in the second display area  12  of the display panel is, for example, a diamond pixel arrangement manner or a delta pixel arrangement manner, or a pearl pixel arrangement manner or a two-in-one pixel arrangement manner, etc. Preferably, the arrangement manner of the pixel units in the first display area  11  and the arrangement manner of the pixel units in the second display area  12  are same. 
     This embodiment further discloses a display device, which comprises a camera and the above-mentioned display panel, and the camera is disposed on a side of the display panel corresponding to the second display area  12 . 
     Specifically, the first display area  11  of the display panel is a normal display area, and the second display area of the display panel is a transmission display area, and the transmission display area has a transmission function and a display function. 
     When the first display area  11  performs the display function, the plurality of pixel units  21  located in the first display area  11  emit light driven by the pixel driving circuit on the array substrate  10 ; and when the second display area  12  performs the display function, the plurality of pixel units  21  located in the second display area  12  emit light driven by the pixel driving circuit on the array substrate  10 , and the camera located on a side of the transmission display area is blocked by the transmission display area and cannot be observed by an user or a terminal located on a side of the transmission display area away from the camera. That is, when the first display area  11  and the second display area  12  both perform the display function, the camera can be hidden, the display panel can truly display in full screen. In addition, since the first display area  11  is provided with the first pixel units  22  and the second pixel units  23 , and the widths of the second portions  231  of the anodes of the second pixel units  23  are greater than the widths of conventional first pixel units  22 , and the second pixel units  23  have the highest luminous efficiency, so that the brightness of the first display area  11  is effectively improved, and the problem of differences in brightness of the display panel and the display device at wide viewing angles caused by a higher light transmittance of a touch film layer of the second display area  12  is prevented. 
     When the first display area  11  performs the display function, the pixel units  21  located in the first display area  11  emit light under driving of the pixel driving circuit on the array substrate  30 . When the second display area  12  performs the transmission function, several pixel units located in the second display area  20  do not emit light, the transmission display area is in a transmission state, and the camera on a side of the transmission display area has a higher light transmittance due to the touch film layer, so that ambient light incident on the second display area  12  from the outside is better received, so as to realize light-sensing and photographing functions. 
     It should be noted that, to make the second widths W 2  of the second pixel units  23  greater than the first widths W 1  of the first pixel unit s 22 , in addition to directly expanding the anodes in the second pixel units  23 , it can also be realized by reducing the light-emitting portions  232  in the pixel units  23 . Although this method reduces the areas of the light-emitting portions  232  in the second pixel units  23 , brightness loss caused by the reduced areas of the light-emitting portions  232  can be compensated by applying higher gamma voltages to the second pixel units  23  through a display driving circuit system of the display panel. This method guarantees the light-emitting effect and at same time, due to the shrinkages of the light-emitting portions of the second pixel units, it is more difficult for the second pixel units to be blocked by metal wires in the touch layer  40  located above at wide viewing angles, which can also achieve a good effect of eliminating differences in brightness at wide viewing angles. 
     A Second Embodiment 
       FIG.  7    is a schematic structural diagram of anodes and light-emitting portions of pixel units of a first display area provided in a second embodiment of the present disclosure. As shown in  FIG.  7   , the display panel and the display device disclosed in the second embodiment of the present disclosure are similar to the display panel and the display device in the first embodiment, and same parts are not repeated here in this embodiment. The difference is that the second width W 2  of at least one second pixel unit  23  is greater than all the first widths W 1 , and the second widths W 2  of the other second pixel units are equal to the largest first width W 1 . For example, in the first display area  11 , the first widths W 1  of all the first pixel units  22  are same; and in every four second pixel units  23 , the second widths W 2  of two of the second pixel units  23  are greater than the first width W 1 , and the second widths W 2  of the other two second pixel units  23  are equal to the first width W 1 . In addition, for example, when the first widths W 1  of the plurality of first pixel units  22  are different, the second widths W 2  of the two second pixel units  23  are greater than the greatest first width W 1 . Preferably, the second pixel units  23  are green pixel units, and the first pixel units  22  are red pixel units and blue pixel units. The light-emitting portion of each green pixel unit has same size, and in every four green pixel units, the sizes of the anodes of two green pixel units are greater than the sizes of the anodes of the other two green pixel units. 
     A Third Embodiment 
       FIG.  8    is a schematic structural diagram of anodes and light-emitting portions of pixel units of a first display area provided in a third embodiment of the present disclosure. As shown in  FIG.  8   , the display panel and the display device disclosed in the third embodiment of the present disclosure is similar to the display panel and the display device in the first embodiment, and same parts are not repeated here in this embodiment. The difference is that a pattern delineated by the edge of the anode of the second pixel unit  22  is different from a pattern delineated by the edge of the light-emitting portion of the second pixel unit  22 . In this embodiment, shapes of the anodes of all the second pixel units  23  of the first display area  11  of the display panel are rectangles, and shapes of all the light-emitting portions  232  of the second pixel units  23  are circles, and the circles are located at center positions of the rectangles. The widths of the second portions  231  of the anodes of the second pixel units  23  have a width interval, a minimum value of the width interval is a minimum distance from a midpoint of one side of the rectangle to the circle, and a maximum value of the width interval is a minimum distance from a corner of the rectangle to the circle. Specifically, a difference value between the maximum width and the minimum width of the second portions  231  of the second pixel units  23  is greater than 0.1 μm. The present disclosure does not limit the maximum value of the difference, as long as the arrangements of the second pixel units  23  do not affect the adjacent pixel units  21 . It should be noted that the shapes of the second pixel units  23  are not limited to the rectangle in this embodiment. In other embodiments, it may also be ellipses, diamonds, triangles, pearls, other polygons, or any irregularities. The specific shape can be adaptively set according to actual needs, which is not limited in this embodiment. 
     The present disclosure provides a display panel and a display device. The display panel comprises: an array substrate; a plurality of pixel units disposed on the array substrate, wherein each pixel unit comprises an anode, a light-emitting portion, and a cathode that are stacked in sequence; an encapsulation layer disposed on the plurality of pixel units; a touch layer disposed on the encapsulation layer; wherein, the display panel is provided with a first display area and a second display area adjacent to the first display area, and a light transmittance of the touch layer in the first display area is less than a light transmittance of the touch layer in the second display area; in the first display area, the plurality of pixel units comprise first pixel units and second pixel units, and a minimum distance between an edge of an anode of at least one of the second pixel units and an edge of a corresponding light-emitting portion is greater than a minimum distance between an edge of an anode of the first pixel unit and an edge of a corresponding light-emitting portion. In the display panel and the display device provided by the present disclosure, in the first display area, by setting the minimum distance between the edge of the anode of at least one of second pixel unit of the plurality of pixel units in the first display area and the edge of the corresponding light-emitting portion greater than the minimum distance between the edge of the anode of the first pixel unit and the edge of the corresponding light-emitting portion, anode areas of at least parts of the second pixel units are additionally increased, and the increased anode areas of the second pixel units can be configured to reflect light generated by the corresponding second pixel units, which increases amount of light output from the first display area at wide viewing angles, improves consistency of display effects of the first display area and the second display area, improves display effect of the display panel at wide viewing angles, and prevents problems of reducing user experience caused by differences in brightness of the display panel at wide viewing angles. 
     When discussing a size of a plane area in the present disclosure, the “size” specifically refers to the “area” of the plane area. The above is a detailed introduction to a display panel and a display device provided by the embodiments of the present disclosure. Specific examples are used in this article to illustrate the principles and implementations of the present disclosure. The descriptions of the above embodiments are only used to help understand the present disclosure. At the same time, for those skilled in the art, according to the idea of the present disclosure, there will be changes in the specific implementation and the scope of the present disclosure. In summary, the content of this specification should not be construed as a limitation to the present disclosure.