Display panel and display device

Abstract

The present application provides a display panel and a display device to reduce the diffraction of the first display area and improve the light transmittance of the first display area. The display panel has a first display area, a second display area and a third display area; the first display area includes a plurality of first light-emitting elements; the third display area includes a plurality of third light-emitting elements, a plurality of first pixel circuits connected to the first light-emitting elements, and a plurality of third pixel circuits connected to the third light-emitting elements; the second display area includes a plurality of second light-emitting elements, and a plurality of second pixel circuits connected to the second light-emitting elements; among the first light-emitting elements, the second light-emitting elements and the third light-emitting elements that emit light of the same color, the area of ​​the anode of the first light-emitting element is less than or equal to the area of ​​the anode of the third light-emitting element, and the area of ​​the anode of the third light-emitting element is less than or equal to the area of ​​the anode of the second light-emitting element. The display device includes the display panel.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] OLED display has become the mainstream display structure because of its high color gamut, thinness, and flexibility. At present, improving the screen-to-body ratio has become one of the core themes of mobile phone innovation. Design solutions such as bangs screen, water drop screen, and hole-punch screen are all efforts to reduce the space occupied by the front camera, that is, by making a hole in the display area and placing the camera under the hole-punch area to reduce the area occupied by the camera in the surrounding area, thereby increasing the screen-to-body ratio; and the ultimate solution must be to use an under-screen camera that does not take up any space at all. Under-Display-Camera or Under-Panel-Camera (UDC or UPC for short) is inevitable in the era of full-screen phones.

[0003] In the design of the under-screen camera, in the area where the under-screen camera is set, due to the complex pixel circuit of the OLED, metal occupies most of the pixel area, resulting in a very small proportion of the light-transmitting area, so the transmittance is low and the diffraction is strong, which seriously affects the camera's photo-taking effect. Summary of the invention

[0004] The present application provides a display panel and a display device. By setting a specific structure of the display panel, the diffraction of the first display area can be greatly reduced, and the light transmittance of the first display area can be improved to ensure high-quality video or photography of an under-screen camera located below the first display area.

[0005] According to a first aspect of an embodiment of the present application, a display panel is provided. The display panel has a first display area, a second display area, and a third display area located between the first display area and the second display area; wherein

[0006] The first display area includes a plurality of first light emitting elements;

[0007] The third display area includes a plurality of third light-emitting elements, a plurality of first pixel circuits and a plurality of third pixel circuits, each of the first pixel circuits is connected to at least one of the first light-emitting elements through a conductive line, and each of the third pixel circuits is connected to at least one of the third light-emitting elements;

[0008] The second display area includes a plurality of second light emitting elements and a plurality of second pixel circuits, and each of the second pixel circuits is connected to at least one of the second light emitting elements;

[0009] The first light-emitting element, the second light-emitting element and the third light-emitting element all include an anode, a light-emitting layer and a cathode which are stacked in sequence along the thickness direction; wherein,

[0010] Among the first light-emitting element, the second light-emitting element and the third light-emitting element that emit light of the same color, the area of ​​the anode of the first light-emitting element is smaller than or equal to the area of ​​the anode of the third light-emitting element, and the area of ​​the anode of the third light-emitting element is smaller than or equal to the area of ​​the anode of the second light-emitting element.

[0011] Optionally, the first light-emitting element, the second light-emitting element and the third light-emitting element each further include a pixel defining layer;

[0012] The pixel defining layer of the first light-emitting element includes a plurality of annular sub-pixel defining layers spaced apart from each other in a horizontal direction, each sub-pixel defining layer is arranged around the outer periphery of an anode of the first light-emitting element, and is partially overlapped on a side of the anode of the first light-emitting element away from the light-emitting layer, the upper surface of each sub-pixel defining layer is arc-shaped, and the color of the pixel defining layer is black.

[0013] Optionally, the width of the portion where the sub-pixel defining layer and the anode of the first light-emitting element overlap is 1 um to 4 um; and / or,

[0014] The ratio of the width of the portion where the sub-pixel defining layer and the anode of the first light-emitting element overlap to the width of the sub-pixel defining layer is 1:1 to 1:6; and / or,

[0015] The ratio of the thickness of the sub-pixel defining layer to the width of the sub-pixel defining layer is 1:2 to 1:8.

[0016] Optionally, a lap portion is provided at one end of the anode of the first light-emitting element, and the lap portion is made of a transparent material.

[0017] Optionally, the anode of the first light-emitting element is in the shape of a rectangle, a square, a circle or an ellipse.

[0018] Optionally, the third display area includes a first sub-display area and a second sub-display area, the first sub-display area is arranged outside the first display area in a first direction, and the second sub-display area is arranged outside the first display area in a second direction, and the second direction is perpendicular to the first direction;

[0019] The first sub-display area is provided with a plurality of the first pixel circuits and a plurality of the third pixel circuits, and the second sub-display area is provided with only a plurality of the third pixel circuits.

[0020] Optionally, the first pixel circuit includes a plurality of first sub-pixel circuits, and the third pixel circuit includes a plurality of third sub-pixel circuits;

[0021] A plurality of the first sub-pixel circuits and a plurality of the third sub-pixel circuits located in the same row of the first sub-display area are arranged alternately; or,

[0022] A plurality of the first sub-pixel circuits and a plurality of the third sub-pixel circuits located in different rows of the third display area are alternately arranged in different rows; or,

[0023] A plurality of first sub-pixel circuits located in the same row of the first sub-display area are arranged adjacent to each other, and a plurality of first sub-pixel circuits located in the same row are arranged adjacent to each other.

[0024] Optionally, the area of ​​the first pixel circuit and the area of ​​the third pixel circuit are both greater than or equal to the area of ​​the second pixel circuit; and the area of ​​the first pixel circuit is greater than or equal to the area of ​​the third pixel circuit.

[0025] Optionally, the first pixel circuit and the third pixel circuit are arranged in the same layer; or, the first pixel circuit and the third pixel circuit are arranged in different layers.

[0026] Optionally, a portion of the conductive line connecting the first pixel circuit and the first light-emitting element located in the first display area is a transparent structure; and / or,

[0027] The portion of the conductive line connecting the first pixel circuit and the first light emitting element located in the first display area is a wavy line.

[0028] According to a second aspect of an embodiment of the present application, a display device is provided, comprising the above-mentioned display panel and an under-screen camera arranged on a side of the display panel away from a light emitting side, wherein the orthographic projection of the first display area covers the orthographic projection of the under-screen camera.

[0029] The display panel and display device of the present application can greatly reduce the diffraction of the first display area by setting the first pixel circuit connected to the first light-emitting element in the first display area in the third display area. This is because the pixel circuit usually includes a metal structure, such as a metal structure such as a transistor and a capacitor, and therefore, its light transmittance is poor. Moving the first pixel circuit originally set in the first display area to the third display area can not only greatly reduce the diffraction of the first display area, that is, reduce the diffraction of the area of ​​the under-screen camera, but also improve the light transmittance of the first display area, ensuring high-quality video or photography of the under-screen camera located below the first display area. In addition, by setting the first light-emitting element, the second light-emitting element and the third light-emitting element that emit light of the same color, the area of ​​the anode of the first light-emitting element is smaller than the area of ​​the anode of the third light-emitting element, and the area of ​​the anode of the third light-emitting element is smaller than the area of ​​the anode of the second light-emitting element, the diffraction of the first display area can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a top view of the structure of a display panel of an exemplary embodiment of the present application.

[0031] Figure 2 It is a schematic top view of another embodiment of a display panel of an exemplary embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of a partial structure of a display panel of an exemplary embodiment of the present application.

[0033] Figure 4 It is a schematic diagram of a top view of the structure of an anode of a first light-emitting element and a first sub-pixel defining layer of a display panel of an exemplary embodiment of the present application.

[0034] Figure 5 It is a schematic cross-sectional structure diagram of an anode and a first sub-pixel defining layer of a first light-emitting element of a display panel according to an exemplary embodiment of the present application.

[0035] Figure 6 It is a schematic diagram of a top view of the structure of an anode and a lap joint of a first light emitting element of a display panel according to an exemplary embodiment of the present application.

[0036] Figure 7 It is a schematic cross-sectional structure diagram of an anode and a lap joint of a first light-emitting element of a display panel according to an exemplary embodiment of the present application.

[0037] Figure 8 It is a schematic cross-sectional structure diagram of an anode of a first light-emitting element of a display panel according to another embodiment of an exemplary embodiment of the present application.

[0038] Fig. 9It is a schematic cross-sectional structure diagram of a display panel in which a first pixel circuit and a third pixel circuit are arranged in different layers according to an exemplary embodiment of the present application.

[0039] Fig.10 It is a schematic cross-sectional structure diagram of a display panel in which a first pixel circuit and a third pixel circuit are arranged in different layers according to another implementation of an exemplary embodiment of the present application.

[0040] Fig.11 It is a schematic cross-sectional structure diagram of a display panel in which a first pixel circuit and a third pixel circuit are arranged on the same layer according to an exemplary embodiment of the present application.

[0041] Fig.12 It is a schematic cross-sectional structural diagram of a display panel in which a first pixel circuit and a third pixel circuit are arranged on the same layer according to another implementation of an exemplary embodiment of the present application.

[0042] Fig.13 It is a schematic diagram of a top view structure in which a first pixel circuit and a third pixel circuit of a display panel of an exemplary embodiment of the present application are arranged on the same layer.

[0043] Fig.14 It is a schematic top view of the structure in which a first pixel circuit and a third pixel circuit of a display panel are arranged on the same layer according to another embodiment of an exemplary embodiment of the present application.

[0044] Fig.15 It is a schematic structural diagram of a conductive line connecting a first pixel circuit and a first light-emitting component of a display panel according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0046] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. Similar words such as "one" or "one" used in this application specification and claims do not indicate a quantitative limitation, but indicate that there is at least one. Similar words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" cover the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. "Multiple" includes two, which is equivalent to at least two. The singular forms of "one", "" and "the" used in this application specification and the attached claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0047] Please combine Figure 1-Figure 15 It is understood that the present embodiment provides a display panel 1. The display panel 1 has a first display area 11, a second display area 12 and a third display area 13 located between the first display area 11 and the second display area 12.

[0048] The first display area 11 includes a plurality of first light-emitting elements 21. The third display area 13 includes a plurality of third light-emitting elements 23, a plurality of first pixel circuits 41 and a plurality of third pixel circuits 43, each of which is connected to at least one first light-emitting element 21 through a conductive line, and each of which is connected to at least one third light-emitting element 23. The second display area 12 includes a plurality of second light-emitting elements 22 and a plurality of second pixel circuits, each of which is connected to at least one second light-emitting element 22. That is, the first display area 11 corresponds to the area where the under-screen camera is set, that is, the orthographic projection of the first display area 11 covers the orthographic projection of the under-screen camera set on the display panel 1 away from the light-emitting side. The second display area 12 is a normal display area; the third display area 13 located between the first display area 11 and the second display area 12 is a transition area to reduce the brightness difference between the first display area 11 and the second display area 12.

[0049] In this embodiment, by setting the first pixel circuit 41 connected to the first light-emitting element 21 in the first display area 11 in the third display area 13, the diffraction of the first display area 11 can be greatly reduced. This is because the pixel circuit usually includes a metal structure, such as: metal structures such as transistors and capacitors, and therefore, its light transmittance is poor; moving the first pixel circuit 41 originally set in the first display area 11 to the third display area 13 can not only greatly reduce the diffraction of the first display area 11, that is, reduce the diffraction in the area of ​​the under-screen camera, but also improve the light transmittance of the first display area 11, thereby ensuring high-quality video or photography of the under-screen camera located below the first display area 11.

[0050] The third display area 13 includes a first sub-display area 131 and a second sub-display area 132 . The first sub-display area 131 is disposed outside the first display area 11 in the first direction W, and the second sub-display area 132 is disposed outside the first display area 11 in the second direction L.

[0051] In this embodiment, if Figure 1 As shown, the first display area 11 is arranged close to the inner edge of the second display area 12, the number of the first sub-display area 131 is two, which are respectively arranged on the left outer side and the right outer side of the first display area 11 along the first direction W, and the number of the second sub-display area 132 is one, which is arranged on the lower outer side of the first display area 11 along the second direction L, and the second direction L is perpendicular to the first direction W.

[0052] Along the second direction L, the size of each first sub-display area 131 is the same as the size of the first display area 11; along the first direction W, the width of each first sub-display area 131 is 1 to 3 times the width of the first display area 11. Along the second direction L, the size of the second sub-display area 132 is less than or equal to the size of the first display area 11; preferably, the size of the second sub-display area 132 is 0.2 to 0.5 times the size of the first display area 11. Along the first direction W, the size of the second sub-display area 132 is greater than or equal to the size of the first display area 11, and the center line of the second sub-display area 132 coincides with the center line of the first display area 11.

[0053] Preferably, the first sub-display area 131 is provided with a plurality of first pixel circuits 41 and a plurality of third pixel circuits 43, and the second sub-display area 132 is provided with only a plurality of third pixel circuits 43. Each row of the first sub-display area 131 is responsible for placing the first pixel circuits 41 of the first display area 11 of the same row (the advantage is that the gate drive circuit, gate line, light-emitting control circuit, initial voltage circuit and other circuits do not need to be misaligned or repeatedly arranged), and the transparent connection line between the first pixel circuit 41 located in the first sub-display area 131 and the first light-emitting element 21 located in the first display area 11 is also arranged in the space of the first sub-display area 131.

[0054] Specifically, the two first sub-display areas 131 disposed on the left outer side and the right outer side are provided with not only the third pixel circuit 43 corresponding to the third light-emitting element 23 in the first sub-display area 131, but also the first pixel circuit 41 corresponding to the first light-emitting element 21 closer thereto. That is, the first sub-display area 131 located on the right outer side of the first display area 11 is provided with not only the third pixel circuit 43 corresponding to the third light-emitting element 23 in the first sub-display area 131, but also the first pixel circuit 41 corresponding to the first light-emitting element 21 in the right half of the first display area 11; the first sub-display area 131 located on the left outer side of the first display area 11 is provided with not only the third pixel circuit 43 corresponding to the third light-emitting element 23 in the first sub-display area 131, but also the first pixel circuit 41 corresponding to the first light-emitting element 21 in the left half of the first display area 11.

[0055] But not limited to this, such as Figure 2 As shown, the first display area 11 can also be set at a position with a distance from the inner edge of the second display area 12, that is, set within the second display area 12 (not close to the inner edge of the second display area 12). In this way, the number of second sub-display areas 132 is two, which are respectively arranged on the upper outer side and the lower outer side of the first display area 11 along the second direction L.

[0056] Similarly, along the second direction L, the size of each first sub-display area 131 is the same as the size of the first display area 11; along the first direction W, the width of each first sub-display area 131 is 1 to 3 times the width of the first display area 11. Along the second direction L, the size of each second sub-display area 132 is less than or equal to the size of the first display area 11; preferably, the size of each second sub-display area 132 is 0.2 to 0.5 times the size of the first display area 11. Along the first direction W, the size of each second sub-display area 132 is greater than or equal to the size of the first display area 11, and the center line of each second sub-display area 132 coincides with the center line of the first display area 11.

[0057] It should also be noted that the first light-emitting element 21, the second light-emitting element 22 and the third light-emitting element 23 all include multiple sub-light-emitting elements that emit light of different colors. For example, the first light-emitting element 21, the second light-emitting element 22 and the third light-emitting element 23 all include a first sub-light-emitting element, a second sub-light-emitting element and a third sub-light-emitting element. The colors of the light emitted by the first sub-light-emitting element, the second sub-light-emitting element and the third sub-light-emitting element are different from each other. For example, the color of the light emitted by the first sub-light-emitting element is red, the color of the light emitted by the second sub-light-emitting element is green, and the color of the light emitted by the third sub-light-emitting element is blue, but it is not limited to this. The color of the light emitted by the first sub-light-emitting element may also be green, the color of the light emitted by the second sub-light-emitting element may be blue, and the color of the light emitted by the third sub-light-emitting element may be red. However, the colors of light emitted by the first sub-light-emitting element of the first light-emitting element 21, the first sub-light-emitting element of the second light-emitting element 22, and the first sub-light-emitting element of the third light-emitting element 23 are the same; similarly, the colors of light emitted by the second sub-light-emitting element of the first light-emitting element 21, the second sub-light-emitting element of the second light-emitting element 22, and the second sub-light-emitting element of the third light-emitting element 23 are the same, and the colors of light emitted by the third sub-light-emitting element of the first light-emitting element 21, the third sub-light-emitting element of the second light-emitting element 22, and the third sub-light-emitting element of the third light-emitting element 23 are the same.

[0058] The first light-emitting element 21, the second light-emitting element 22 and the third light-emitting element 23 all include an anode, a light-emitting layer and a cathode stacked in sequence along the thickness direction T. In this embodiment, the size and shape of the pixel corresponding to the light-emitting element are defined by the size and shape of the anode. The pixel also includes sub-pixels of different colors corresponding to a plurality of sub-light-emitting elements emitting light of different colors.

[0059] like Figure 3As shown, in the first light-emitting element 21, the second light-emitting element 22, and the third light-emitting element 23 that emit light of the same color, the area of ​​the anode of the first light-emitting element 21 is smaller than or equal to the area of ​​the anode of the third light-emitting element 23, and the area of ​​the anode of the third light-emitting element 23 is smaller than or equal to the area of ​​the anode of the second light-emitting element 22. That is, in the first sub-light-emitting element of the first light-emitting element 21, the first sub-light-emitting element of the second light-emitting element 22, and the first sub-light-emitting element of the third light-emitting element 23, the area of ​​the anode 211 of the first sub-light-emitting element of the first light-emitting element is smaller than or equal to the area of ​​the anode 231 of the first sub-light-emitting element of the third light-emitting element, and the area of ​​the anode 231 of the first sub-light-emitting element of the third light-emitting element is smaller than or equal to the area of ​​the anode 221 of the first sub-light-emitting element of the second light-emitting element; similarly, in the second sub-light-emitting element of the first light-emitting element 21, the second sub-light-emitting element of the second light-emitting element 22, and the second sub-light-emitting element of the third light-emitting element 23, the area of ​​the anode 212 of the second sub-light-emitting element of the first light-emitting element is smaller than The area of ​​the anode 213 of the third sub-light-emitting element of the first light-emitting element 21, the third sub-light-emitting element of the second light-emitting element 22, and the third sub-light-emitting element of the third light-emitting element 23 is less than or equal to the area of ​​the anode 232 of the second sub-light-emitting element of the third light-emitting element, and the area of ​​the anode 232 of the second sub-light-emitting element of the third light-emitting element is less than or equal to the area of ​​the anode 222 of the second sub-light-emitting element of the second light-emitting element; similarly, in the third sub-light-emitting element of the first light-emitting element 21, the third sub-light-emitting element of the second light-emitting element 22, and the third sub-light-emitting element of the third light-emitting element 23, the area of ​​the anode 213 of the third sub-light-emitting element of the first light-emitting element is less than or equal to the area of ​​the anode 233 of the third sub-light-emitting element of the third light-emitting element, and the area of ​​the anode 233 of the third sub-light-emitting element of the third light-emitting element is less than or equal to the area of ​​the anode 223 of the third sub-light-emitting element of the second light-emitting element.

[0060] In this way, by arranging in the first light-emitting element 21, the second light-emitting element 22 and the third light-emitting element 23 that emit light of the same color, the area of ​​the anode of the first light-emitting element 21 is smaller than or equal to the area of ​​the anode of the third light-emitting element 23, and the area of ​​the anode of the third light-emitting element 23 is smaller than or equal to the area of ​​the anode of the second light-emitting element 22, the diffraction of the first display area 11 can be further reduced.

[0061] The first light emitting element 21 , the second light emitting element 22 and the third light emitting element 23 each further include a pixel defining layer 70 .

[0062] like Figure 4 , Figure 5 and Fig.11As shown, the pixel defining layer 70 of the first light-emitting element 21 includes a plurality of annular sub-pixel defining layers 71 spaced apart from each other in the horizontal direction, each sub-pixel defining layer 71 is arranged around the outer periphery of the anode 24 of a first light-emitting element, and is partially overlapped on the side of the anode 24 of the first light-emitting element away from the light-emitting layer (the overlapping portion of the sub-pixel defining layer 71 and the anode 24 of the first light-emitting element is recorded as the first portion 711, and the portion where the sub-pixel defining layer 71 and the anode 24 of the first light-emitting element are not overlapped is the second portion 712), the upper surface of each sub-pixel defining layer 71 is arc-shaped, and the color of the pixel defining layer 70 is black, thereby forming a gradually changing transmittance area at the outer periphery of the anode, so that the transmittance gradually increases from the boundary of the anode to the area without the anode, thereby achieving the effect of reducing diffraction.

[0063] Preferably, the width w1 of the first portion 711 of the sub-pixel defining layer 71 is 1 um to 4 um. The ratio of the width w1 of the first portion 711 of the sub-pixel defining layer 71 to the width w2 of the sub-pixel defining layer 71 is 1:1 to 1:6. The ratio of the thickness t of the sub-pixel defining layer 71 to the width w2 of the sub-pixel defining layer 71 is 1:2 to 1:8.

[0064] Preferably, if Figure 6 and Figure 7 As shown, one end of the anode 24 of the first light-emitting element is provided with a lap portion 25, and the lap portion 25 is used to electrically connect the anode and other structures. The material of the lap portion 25 is a transparent material to further achieve the effect of reducing diffraction. Specifically, the material of the lap portion 25 can be a transparent material such as ITO. The anode includes a stacked first metal layer 241, an intermediate layer 242 and a second metal layer 243 along the thickness direction T, wherein the materials of the first metal layer 241 and the second metal layer 243 are both ITO, and the material of the intermediate layer 242 is Ag.

[0065] In another embodiment, Figure 8 As shown, the anode 24 of the first light emitting element is a semi-transparent anode, and the light transmittance of the semi-transparent anode is 30% to 70%, so as to further achieve the effect of reducing diffraction. Specifically, the semi-transparent anode can be formed by an ultra-thin Ag metal layer.

[0066] Preferably, please refer to Figure 3, the shape of the anode of the first light-emitting element 21 (i.e., the anode 211 of the first sub-light-emitting element of the first light-emitting element, the anode 212 of the second sub-light-emitting element of the first light-emitting element, and the anode 213 of the third sub-light-emitting element of the first light-emitting element) is rectangular, square, circular or elliptical. By setting the shape of the anode of the first light-emitting element 21 to be rectangular, square, circular or elliptical, compared with the hexagonal or pentagonal shape usually set for the light-emitting element, it can achieve the beneficial effect of better reducing diffraction. However, it is not limited to this, and the shape of the anode of the first light-emitting element 21 can also be set to other shapes, such as polygons. The shape of the anode of the second light-emitting element 22 (i.e., the anode 221 of the first sub-light-emitting element of the second light-emitting element, the anode 222 of the second sub-light-emitting element of the second light-emitting element, and the anode 223 of the third sub-light-emitting element of the second light-emitting element) and the anode of the third light-emitting element 23 (i.e., the anode 231 of the first sub-light-emitting element of the third light-emitting element, the anode 232 of the second sub-light-emitting element of the third light-emitting element, and the anode 233 of the third sub-light-emitting element of the third light-emitting element) can also be rectangular, square, circular or elliptical, or other shapes such as hexagonal, pentagonal, etc.

[0067] In this embodiment, the area of ​​the first pixel circuit 41 and the area of ​​the third pixel circuit 43 are both greater than or equal to the area of ​​the second pixel circuit, and the area of ​​the first pixel circuit 41 is greater than or equal to the area of ​​the third pixel circuit, so as to drive higher brightness by providing larger current.

[0068] Specifically, the first pixel circuit 41, the second pixel circuit and the third pixel circuit 43 all have the same number of thin film transistors, but the width-to-length ratio (W / L) of the channel of one or several thin film transistors in the first pixel circuit 41 and the third pixel circuit 43 is greater than the width-to-length ratio of the channel of the corresponding thin film transistor of the second pixel circuit, so as to provide a larger current to drive a higher brightness. However, it is not limited to this, and the width-to-length ratio of the channel of one or several thin film transistors in the first pixel circuit 41 and the third pixel circuit 43 may also be equal to the width-to-length ratio of the channel of the corresponding thin film transistor of the second pixel circuit.

[0069] Furthermore, the width-to-length ratio of the channels of some thin film transistors of the first pixel circuit 41 of the first light-emitting element 21 is greater than or equal to the width-to-length ratio of the channels of corresponding thin film transistors of the third pixel circuit 43 of the third light-emitting element 23, and the width-to-length ratio of the channels of some thin film transistors of the third pixel circuit 43 of the third light-emitting element 23 is greater than or equal to the width-to-length ratio of the channels of corresponding thin film transistors of the second pixel circuit of the second light-emitting element 22.

[0070] There are two ways to set the first pixel circuit 41 outside the first display area 11. The first setting method: the first pixel circuit 41 and the third pixel circuit 43 are set in different layers; the second setting method: the first pixel circuit 41 and the third pixel circuit 43 are set in the same layer.

[0071] In the first arrangement mode in which the first pixel circuit 41 is externally disposed in the first display area 11, the first pixel circuit 41 and the third pixel circuit 43 are disposed in different layers in the third display area 13; the third light emitting element 23 and the first light emitting element 21 are disposed in the same layer, and the third light emitting element 23 is disposed in the third display area 13, and the first light emitting element 21 is disposed in the first display area 11. Fig. 9 As shown, it is a schematic diagram of the cross-sectional structure of the first pixel circuit 41 and the third pixel circuit 43 arranged in different layers. The first pixel circuit 41 includes a first thin film transistor, which includes a first active layer 511, a first gate insulating layer 512, a first gate electrode 513, a first interlayer insulating layer 514, a first source electrode 515, and a first drain electrode 516. The first drain electrode 516 has a first source electrode connected to the active layer, and the other end of the first drain electrode 516 is connected to the anode 24 of the first light-emitting element through a first conductive line 517. The third pixel circuit 43 includes a third thin film transistor, which includes a third active layer 531, a third gate insulating layer 532, a third gate electrode 533, a third interlayer insulating layer 534, a third source electrode 535, and a third drain electrode 536. The third drain electrode 536 has a third source electrode connected to the active layer, and the other end of the third drain electrode 536 is connected to the anode 26 of the third light-emitting element through a third conductive line 537. The first gate insulating layer 512 includes a first sub-gate insulating layer 518 and a second sub-gate insulating layer 519 , and the third gate insulating layer 532 includes a third sub-gate insulating layer 538 and a fourth sub-gate insulating layer 539 .

[0072] The first thin film transistor is arranged on the upper layer, and the third thin film transistor is arranged on the lower layer. Specifically, a first buffer layer 62 is arranged on the substrate 61, a layer structure of the third thin film transistor is arranged on the first buffer layer 62, a first planar layer 63 and a second buffer layer 64 are arranged in sequence on the layer structure of the third thin film transistor, a layer structure of the first thin film transistor is arranged on the second buffer layer 64, a second planar layer 65 is arranged on the layer structure of the first thin film transistor, and anodes of all light-emitting elements and a pixel defining layer 70 are arranged on the second planar layer 65.

[0073] Among them, the material of the third active layer 531 of the third thin film transistor located in the lower layer is low temperature polysilicon (Low Temperature Poly-Silicon, abbreviated as LTPS, polysilicon is also abbreviated as p-Si), and the material of the first active layer 511 of the first thin film transistor located in the upper layer is indium gallium zinc oxide (indium gallium zinc oxide, abbreviated as IGZO). Since the temperature for forming the indium gallium zinc oxide layer is relatively low, the first active layer 511 located in the upper layer uses indium gallium zinc oxide as the material, which can avoid affecting other layer structures during the formation process.

[0074] like Fig.10 As shown, in another embodiment, the first sub-gate insulating layer may be patterned to hydrogenate the indium gallium zinc oxide of the first active layer 511 to achieve the conductorization of the first active layer 511 .

[0075] like Fig.11 As shown, in the second arrangement mode in which the first pixel circuit 41 is externally disposed in the first display area 11, the first pixel circuit 41 and the third pixel circuit 43 are arranged in the third display area 13 at the same layer, the third light emitting element 23 is arranged in the third display area 13, and the first light emitting element 21 is arranged in the first display area 11. The structures of the first pixel circuit 41 and the third pixel circuit 43 are not repeatedly described here. Since the first pixel circuit 41 and the third pixel circuit 43 are arranged in the same layer, the first active layer 511 of the first thin film transistor and the third active layer 531 of the third thin film transistor are arranged in the same layer, and similarly, the first gate electrode 513 and the third gate electrode 533 are arranged in the same layer, and the first source electrode 515, the first drain electrode 516, the third source electrode 535 and the third drain electrode 536 are arranged in the same layer; the first gate insulating layer 512 and the third gate insulating layer 532 are in the same layer structure, and similarly, the first interlayer insulating layer 514 and the third interlayer insulating layer 534 are in the same layer structure. Fig.11 The sub-pixel defining layer 71 of the first light emitting element 21 located in the first display area 11 is black, and the specific structure is as described above. However, it is not limited thereto. Fig.12 As shown, in another embodiment, the pixel defining layer 70 located in the first display area 11 may also be a single-layer structure and made of a transparent material.

[0076] In order to save space, one pixel circuit can drive one or more sub-pixels to light up, that is, the thin film transistor in one pixel circuit can be connected to the anode of one or more sub-light emitting elements. In this embodiment, the thin film transistor in one pixel circuit is connected to the anodes of two sub-light emitting elements.

[0077] It should be noted that if Fig.13As shown, when the first pixel circuit 41 and the second pixel circuit are arranged in the first sub-display area 131 of the third display area 13, the third sub-pixel circuit 431 corresponding to the sub-pixels of the first sub-display area 131 of the third display area 13 can be arranged first, and then the first sub-pixel circuit 411 corresponding to the sub-pixels of the first display area 11 can be arranged, so that the multiple third sub-pixel circuits 431 corresponding to the multiple sub-pixels of the first sub-display area 131 located in the same row are arranged adjacent to each other, and the multiple first sub-pixel circuits 411 corresponding to the multiple sub-pixels of the first display area 11 located in the same row are arranged adjacent to each other. That is, the three third sub-pixel circuits 431 corresponding to the three sub-pixels of the third display area 13 are arranged first, and then the three first sub-pixel circuits 411 corresponding to the three sub-pixels of the first display area 11 are arranged. The connection lines (the connection lines include gate lines and other lines along the first direction W; data lines and other lines arranged along the second direction L) are arranged by first arranging the connection lines connected to the anodes of the sub-light-emitting elements of the third display area 13, and then arranging the connection lines connected to the anodes of the sub-light-emitting elements of the first display area 11.

[0078] But not limited to this, such as Fig.14 As shown, the third sub-pixel circuits 431 corresponding to the sub-pixels of the first sub-display area 131 of the third display area 13 and the first sub-pixel circuits 411 corresponding to the sub-pixels of the first display area 11 located in the same row may also be arranged alternately;

[0079] Alternatively, the third sub-pixel circuits 431 corresponding to the sub-pixels of the first sub-display area 131 of the third display area 13 located in different rows and the first sub-pixel circuits 411 corresponding to the sub-pixels of the first display area 11 are alternately arranged in different rows;

[0080] This is more conducive to the arrangement of the connection lines, ie, the connection lines connected to the anodes of the sub-light emitting elements of the first display area 11 .

[0081] like Fig.15 As shown, preferably, the first conductive line 517 connecting the first pixel circuit 41 and the first light-emitting component is located in the first display area 11 and is a transparent structure. In addition, the first conductive line 517 connecting the first pixel circuit 41 and the first light-emitting element 21 is located in the first display area 11 and is a wavy line. However, it is not limited thereto. The first conductive line 517 connecting the first pixel circuit 41 and the first light-emitting component is located in a portion other than the third display area 13 and may also be a transparent structure. Similarly, the first conductive line 517 connecting the first pixel circuit 41 and the first light-emitting element 21 is located in a portion other than the third display area 13 and may also be a wavy line.

[0082] This embodiment further provides a display device, which includes the above-mentioned display panel 1 and an under-screen camera disposed on the display panel 1 away from the light-emitting side, wherein the orthographic projection of the first display area 11 covers the orthographic projection of the under-screen camera.

[0083] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: It has a first display area, a second display area and a third display area located between the first display area and the second display area; wherein, The first display area includes a plurality of first light emitting elements; The third display area includes a plurality of third light-emitting elements, a plurality of first pixel circuits and a plurality of third pixel circuits, each of the first pixel circuits is connected to at least one of the first light-emitting elements through a conductive line, and each of the third pixel circuits is connected to at least one of the third light-emitting elements; The second display area includes a plurality of second light emitting elements and a plurality of second pixel circuits, and each of the second pixel circuits is connected to at least one of the second light emitting elements; The first light-emitting element, the second light-emitting element and the third light-emitting element all include an anode, a light-emitting layer and a cathode which are stacked in sequence along the thickness direction; wherein, Among the first light-emitting element, the second light-emitting element, and the third light-emitting element that emit light of the same color, an area of ​​an anode of the first light-emitting element is smaller than or equal to an area of ​​an anode of the third light-emitting element, and an area of ​​an anode of the third light-emitting element is smaller than or equal to an area of ​​an anode of the second light-emitting element; The first light-emitting element also includes a pixel defining layer, and the pixel defining layer of the first light-emitting element includes a plurality of annular sub-pixel defining layers spaced apart from each other in a horizontal direction, each sub-pixel defining layer is arranged around the outer periphery of an anode of the first light-emitting element, and is partially overlapped on a side of the anode of the first light-emitting element away from the light-emitting layer, and the upper surface of each sub-pixel defining layer is arc-shaped, and the color of the pixel defining layer is black.

2. The display panel according to claim 1, wherein: The second light-emitting element and the third light-emitting element each further include a pixel defining layer.

3. The display panel according to claim 2, wherein: The width of the portion where the sub-pixel defining layer and the anode of the first light-emitting element overlap is 1 um to 4 um; and / or, The ratio of the width of the portion where the sub-pixel defining layer and the anode of the first light-emitting element overlap to the width of the sub-pixel defining layer is 1:1 to 1:6; and / or, The ratio of the thickness of the sub-pixel defining layer to the width of the sub-pixel defining layer is 1:2 to 1:

8.

4. The display panel according to claim 1, wherein: An overlap portion is provided at one end of the anode of the first light emitting element, and the overlap portion is made of a transparent material.

5. The display panel according to claim 1, wherein: The anode of the first light emitting element has a rectangular, square, circular or elliptical shape.

6. The display panel according to claim 1, wherein: The third display area includes a first sub-display area and a second sub-display area, the first sub-display area is arranged outside the first display area in a first direction, and the second sub-display area is arranged outside the first display area in a second direction, and the second direction is perpendicular to the first direction; The first sub-display area is provided with a plurality of the first pixel circuits and a plurality of the third pixel circuits, and the second sub-display area is provided with only a plurality of the third pixel circuits.

7. The display panel according to claim 6, wherein: The first pixel circuit includes a plurality of first sub-pixel circuits, and the third pixel circuit includes a plurality of third sub-pixel circuits; A plurality of the first sub-pixel circuits and a plurality of the third sub-pixel circuits located in the same row of the first sub-display area are arranged alternately; or, A plurality of the first sub-pixel circuits and a plurality of the third sub-pixel circuits located in different rows of the third display area are alternately arranged in different rows; or, A plurality of first sub-pixel circuits located in the same row of the first sub-display area are arranged adjacent to each other, and a plurality of first sub-pixel circuits located in the same row are arranged adjacent to each other.

8. The display panel according to claim 1, wherein: An area of ​​the first pixel circuit and an area of ​​the third pixel circuit are both greater than or equal to an area of ​​the second pixel circuit; and an area of ​​the first pixel circuit is greater than or equal to an area of ​​the third pixel circuit.

9. The display panel according to claim 1, wherein: The first pixel circuit and the third pixel circuit are arranged in the same layer; or, the first pixel circuit and the third pixel circuit are arranged in different layers.

10. The display panel according to claim 1, wherein: The conductive line connecting the first pixel circuit and the first light-emitting element is located in the first display area and has a transparent structure; and / or, The portion of the conductive line connecting the first pixel circuit and the first light emitting element located in the first display area is a wavy line.

11. A display device, characterized in that: It comprises a display panel as described in any one of claims 1 to 10 and an under-screen camera arranged on the display panel away from the light-emitting side, and the orthographic projection of the first display area covers the orthographic projection of the under-screen camera.

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