Display panel and display device

Abstract

The utility model discloses a display panel and display device, display panel includes substrate, color filter layer, transparent optical adhesive layer, pixel definition layer and cathode layer, pixel definition layer is located the one side of transparent optical adhesive layer away from substrate, wherein, transparent optical adhesive layer sets up first recess, pixel definition layer includes first definition branch, and cathode includes first cathode branch, along first direction, first recess, first definition branch and first cathode branch three project interlaced, and all with the non opening area projection interlaced of pixel definition layer, part first definition branch is located in first recess, forms first recess, part first cathode branch is located in first recess and forms reflecting electrode. Through setting up first recess in transparent optical adhesive layer, make corresponding first definition branch form first recess, and then make the first cathode branch of being located in first recess form reflecting electrode, utilize reflecting electrode and solve the light leakage problem between adjacent subpixels, improve display effect.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0002] Organic light-emitting diode (OLED) display devices have many advantages, such as being thin and light, actively emitting light, having a fast response speed, a wide viewing angle, rich colors, high brightness, low power consumption, and resistance to high and low temperatures, making them highly favored in the field of display technology.

[0003] OLED display panels consist of multiple subpixels, each capable of emitting different colors of light to achieve color display. However, existing technology suffers from the following drawback: light leakage occurs between adjacent subpixels, affecting display quality. For example, ... Figure 1 As shown, taking an OLED display panel including a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and a white sub-pixel W as an example, when the white sub-pixel W emits light, it will leak light into the light-emitting areas of adjacent sub-pixels (such as the red sub-pixel R and the blue sub-pixel B), and interfere with the light emitted by the adjacent sub-pixels, causing the interference area Q to lose color and reducing the saturation of the adjacent sub-pixels. Utility Model Content

[0004] The purpose of this invention is to provide a display panel and display device to solve the problem of light leakage between adjacent sub-pixels and improve the display effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A display panel is provided, comprising:

[0007] Substrate;

[0008] A color filter layer is located on one side of the substrate; the color filter layer includes at least two color resist units of different colors;

[0009] A transparent optical adhesive layer is located on the side of the color filter layer furthest from the substrate;

[0010] A pixel defining layer is located on the side of the transparent optical adhesive layer away from the substrate; the pixel defining layer has pixel openings, and along a first direction, at least a portion of the pixel openings overlap with the projection of the color resist unit; the first direction is perpendicular to the plane where the substrate is located;

[0011] The cathode layer is located on the side of the pixel-defining layer away from the substrate;

[0012] The transparent optical adhesive layer has a first groove, the pixel limiting layer includes a first limiting portion, and the cathode includes a first cathode portion. Along the first direction, the projections of the first groove, the first limiting portion, and the first cathode portion overlap, and all of them overlap with the projection of the non-opening area of ​​the pixel limiting layer. A portion of the first limiting portion is located in the first groove to form a first recess. A portion of the first cathode portion is located in the first recess to form a reflective electrode.

[0013] As a preferred embodiment of the display panel, the display panel further includes a light-emitting layer, which comprises multiple light-emitting units located within pixel openings;

[0014] The light-emitting unit includes a white light-emitting unit. Along the first direction, the white light-emitting unit overlaps with the projection of the transparent optical adhesive layer, but does not overlap with the color resist unit.

[0015] Along a direction parallel to the plane of the substrate, the first recess is located on at least one side of the white light-emitting unit.

[0016] As a preferred embodiment of the display panel, the light-emitting unit further includes a first light-emitting unit and a second light-emitting unit;

[0017] The white light-emitting unit is disposed adjacent to the first light-emitting unit, and the first recess is located between the white light-emitting unit and the first light-emitting unit; and / or,

[0018] The white light-emitting unit and the second light-emitting unit are arranged adjacent to each other, and the first recess is located between the white light-emitting unit and the second light-emitting unit;

[0019] The first and second light-emitting units emit different colors of light.

[0020] As a preferred embodiment of the display panel, along the first direction, the depth of the first recess is equal to the depth of the first groove.

[0021] As a preferred embodiment of the display panel, along the first direction, the depth of the first recess is greater than the depth of the first groove.

[0022] As a preferred embodiment of the display panel, a second groove is provided in the first defined portion, and the projection of the second groove overlaps with that of the first groove along the first direction. The depth of the first recess is equal to the sum of the depths of the first groove and the second groove.

[0023] As a preferred embodiment of the display panel, along the first direction, the depth of the second groove is less than or equal to the thickness of the pixel defining layer.

[0024] As a preferred embodiment of the display panel, the cathode layer further includes a second cathode portion located within the pixel opening;

[0025] Along the first direction, the first cathode portion located within the first recess includes opposing first and second surfaces, with the first surface located on the side of the second surface closer to the substrate. The second cathode portion includes opposing third and fourth surfaces, with the third surface located on the side of the fourth surface closer to the substrate.

[0026] The first surface is located at least on the side of the third surface closest to the substrate.

[0027] As a preferred embodiment of the display panel, the display panel further includes an anode layer located between a transparent optical adhesive layer and a pixel defining layer. The anode layer includes multiple anode structures, and a portion of the anode structures are exposed by a pixel opening. Along a first direction, the anode structures include opposing fifth and sixth surfaces, with the fifth surface located on the side of the sixth surface closer to the substrate.

[0028] The first surface is located on the side of the fifth surface closest to the substrate.

[0029] In addition, a display device is provided, including the display panel provided by any of the above solutions.

[0030] The beneficial effects of this utility model are as follows: By setting a first groove in the transparent optical adhesive layer through the non-opening area of ​​the corresponding pixel limiting layer, a part of the first limiting portion corresponding to the first groove in the pixel limiting layer is filled in the first groove, forming a first recess on the first limiting portion. Then, a part of the first cathode portion corresponding to the first limiting portion in the cathode layer covers the first recess, thereby forming a reflective electrode using the cathode layer located in the first recess. The reflective effect of the reflective electrode on light reduces or even avoids light leakage between adjacent sub-pixels, improving the display effect.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a partial display effect diagram of an existing display panel.

[0034] Figure 2 This is a partial top view of a display panel provided in an embodiment of the present utility model.

[0035] Figure 3 For along Figure 2 A schematic diagram of the first cross-sectional structure of the display panel, captured by CC'.

[0036] Figure 4 For along Figure 2 A schematic diagram of the second cross-sectional structure of the display panel, captured by CC'.

[0037] Figure 5 For along Figure 2 A schematic diagram of the third cross-sectional structure of the display panel, captured by CC'.

[0038] Figure 6 This is a schematic diagram of the structure of a display device provided in an embodiment of the present utility model.

[0039] Figures 1-6 middle:

[0040] R, red subpixel; G, green subpixel; B, blue subpixel; W, white subpixel; Q, diffraction region;

[0041] 100. Display panel; 10. Substrate; 60. Circuit functional layer;

[0042] 20. Color filter layer; 21. Color resist unit; 211. Red color resist unit; 212. Blue color resist unit; 213. Green color resist unit;

[0043] 30. Transparent optical adhesive layer; 311. First groove;

[0044] 40. Pixel limiting layer; 401. Pixel opening; 402. Non-opening area; 403. Second groove; 410. First limiting portion; 411. First recess;

[0045] 50. Cathode layer; 510. First cathode section; 520. Second cathode section;

[0046] 70. Anode layer; 701. Anode structure;

[0047] 80. Light-emitting layer; 81. Light-emitting unit; 811. Red light-emitting unit; 812. Blue light-emitting unit; 813. Green light-emitting unit; 814. White light-emitting unit; 81a. First light-emitting unit; 81b. Second light-emitting unit;

[0048] F1, First surface; F2, Second surface; F3, Third surface; F4, Fourth surface; F5, Fifth surface; F6, Sixth surface; Z, First direction;

[0049] 200. Display device. Detailed Implementation

[0050] The advantages and features of this invention, as well as methods of implementing them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, this invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. These embodiments are provided merely to complete the disclosure of this invention and to enable those skilled in the art to fully understand its scope, which is defined only by the scope of the claims. The same reference numerals denote the same constituent elements throughout the specification.

[0051] The present invention will now be described in detail with reference to the accompanying drawings.

[0052] like Figure 2 and Figure 3 As shown, the display panel 100 provided in this embodiment of the present invention includes a substrate 10, a color filter layer 20, a transparent optical adhesive layer 30, a pixel defining layer 40, and a cathode layer 50; the color filter layer 20 is located on one side of the substrate 10; the color filter layer 20 includes at least two different color resist units 21; the transparent optical adhesive layer 30 is located on the side of the color filter layer 20 away from the substrate 10; the pixel defining layer 40 is located on the side of the transparent optical adhesive layer 30 away from the substrate 10; the pixel defining layer 40 is provided with pixel openings 401, and along the first direction Z, at least a portion of the pixel openings 401 overlap with the projection of the color resist units 21; the first direction Z is perpendicular to the plane where the substrate 10 is located; the cathode layer 50 is located on the side of the pixel defining layer 40 away from the substrate 10.

[0053] In addition, such as Figure 3 As shown, the display panel 100 also includes a circuit functional layer 60, an anode layer 70, and a light-emitting layer 80. The anode layer 70 is located between the transparent optical adhesive layer 30 and the pixel defining layer 40, and includes multiple anode structures 701. The pixel opening 401 exposes a portion of the anode structures 701. The light-emitting layer 80 includes multiple light-emitting units 81, which are located within the pixel opening 401. The anode structures 701, light-emitting units 81, and cathode layer 50, which are projected and overlapped along the first direction Z, constitute an OLED light-emitting element. The circuit functional layer 60 contains pixel circuitry for driving the OLED light-emitting element to emit light.

[0054] like Figure 2As shown, in this embodiment, the display panel includes a red sub-pixel R, a blue sub-pixel B, a green sub-pixel G, and a white sub-pixel W. Correspondingly, the light-emitting unit 81 includes a red light-emitting unit 811, a blue light-emitting unit 812, a green light-emitting unit 813, and a white light-emitting unit 814; correspondingly, the color resist unit 21 includes a red color resist unit 211, a blue color resist unit 212, and a green color resist unit 213. Furthermore, along the first direction Z, the white light-emitting unit 814 overlaps with the transparent optical adhesive layer 30 by projection, but does not overlap with the color resist unit 21. In other words, it can be understood that part of the transparent optical adhesive layer 30 is reused as a white color resist. At this time, some pixel openings 401 overlap with the color resist unit 21 by projection. Specifically, the pixel openings 401 corresponding to the monochromatic light-emitting units (such as red, green, and blue light-emitting units) overlap with the color resist unit 21 by projection, while the pixel openings 401 corresponding to the white light-emitting unit 814 do not overlap with the color resist unit 21.

[0055] In other embodiments, the display panel may include only red sub-pixels R, blue sub-pixels B, and green sub-pixels G, excluding white sub-pixels. In this case, each pixel opening 401 overlaps with the projection of the color resist unit 21.

[0056] In other embodiments, the sub-pixels in the display panel can be sub-pixels of other colors. This embodiment of the present invention does not limit this. The light-emitting units in the light-emitting layer and the color-blocking units in the color filter layer can be adapted, and will not be illustrated here.

[0057] Furthermore, such as Figure 2 and Figure 3 As shown, in this embodiment, the transparent optical adhesive layer 30 is provided with a first groove 311, the pixel limiting layer 40 includes a first limiting portion 410, and the cathode layer 50 includes a first cathode portion 510. Along the first direction Z, the projections of the first groove 311, the first limiting portion 410, and the first cathode portion 510 overlap, and all of them overlap with the projection of the non-opening area 402 of the pixel limiting layer 40. A portion of the first limiting portion 410 is located in the first groove 311, forming a first recess 411. A portion of the first cathode portion 510 is located in the first recess 411, forming a reflective electrode.

[0058] The non-aperture region 402 of the pixel limiting layer 40 refers to the region outside the area where the pixel opening 401 is located in the pixel limiting layer 40. For example... Figure 2 As shown, it can be understood that the pixel limiting layer 40 (non-opening area 402) is in the form of a grid, and the grid opening is the pixel opening 401. The pixel limiting layer corresponding to the area where the pixel opening 401 is located has been removed during the preparation process and is used to subsequently create a light-emitting layer in the pixel opening.

[0059] like Figure 2 and Figure 3As shown, the first limiting portion 410 is a part of the pixel limiting layer 40, specifically referring to the portion of the pixel limiting layer 40 that has a recess (i.e., the first recess 411).

[0060] like Figure 2 and Figure 3 As shown, the first cathode portion 510 is a part of the cathode layer 50 and is disposed corresponding to the first limiting portion 410. Specifically, the first cathode portion 510 can be understood as the portion of the cathode layer 50 located on the side of the first limiting portion 410 away from the substrate 10.

[0061] Furthermore, in this embodiment, the cathode layer 50 is opaque, and the material used to prepare it may include, but is not limited to, aluminum. Since the first defining portion 410 has a first recess 411, and a portion of the first cathode portion 510 is located within the first recess 411, the first cathode portion 510 within the first recess 411 can effectively block the light radiated from a single sub-pixel to its adjacent sub-pixels when the sub-pixel emits light, thereby preventing light leakage between adjacent sub-pixels.

[0062] Furthermore, such as Figure 2 and Figure 3 As shown, in this embodiment, the first recess 411 is formed by providing a first groove 311 in the transparent optical adhesive layer 30 corresponding to the non-opening area 402 of the pixel limiting layer 40. Thus, a portion of the pixel limiting layer 40 above the transparent optical adhesive layer 30 (i.e., a portion of the first limiting portion 410) fills the first groove 311, thereby forming the first recess 411. At this time, along the first direction Z, the depth of the first recess 411 is equal to the depth of the first groove 311, both of which have a depth of h.

[0063] Specifically, in practical implementation, the target adjacent sub-pixels that need to prevent light leakage can be determined first according to actual needs. Then, the portion of the pixel limiting layer 40 located between the light-emitting units corresponding to the target adjacent sub-pixels can be defined as the first limiting portion 410. Next, when preparing the transparent optical adhesive layer 30, a first groove 311 can be processed in the transparent optical adhesive layer 30 corresponding to the area where the first limiting portion 410 is located. The pixel limiting layer 40 prepared thereafter will form a recess at the corresponding position (that is, a first recess 411 is formed on the first limiting portion 410). The cathode layer 50 prepared thereafter will cover along the first recess 411 to form a reflective electrode for reflecting light and preventing light leakage between adjacent sub-pixels.

[0064] In one embodiment, such as Figure 2 and Figure 3As shown, when the light-emitting unit 81 includes a white light-emitting unit 814, the first recess 411 is located on at least one side of the white light-emitting unit 814 along a direction parallel to the plane of the substrate 10. This configuration allows for the determination of the target adjacent sub-pixels based on the location of the white light-emitting unit 814, thereby determining the target formation position of the first recess 411, solving the aforementioned light leakage problem from the white sub-pixel W to adjacent sub-pixels, and improving the display effect.

[0065] Furthermore, such as Figure 2 and Figure 3 As shown, in one embodiment, the light-emitting unit 81 further includes a first light-emitting unit 81a and a second light-emitting unit 81b; a white light-emitting unit 814 is disposed adjacent to the first light-emitting unit 81a, and a first recess 411 is located between the white light-emitting unit 814 and the first light-emitting unit 81a; and / or, the white light-emitting unit 814 is disposed adjacent to the second light-emitting unit 81b, and the first recess 411 is located between the white light-emitting unit 814 and the second light-emitting unit 81b; the first light-emitting unit 81a and the second light-emitting unit 81b emit different colors.

[0066] Specifically, a white sub-pixel and its adjacent sub-pixel can be defined as target adjacent sub-pixels. The pixel-defining layer 40 located between these target adjacent sub-pixels is then defined as the first defining portion 410. A first recess 411 is formed on the first defining portion 410 by forming a first groove 311 in the transparent optical adhesive layer 30 at the corresponding position, thus solving the problem of light leakage from the white sub-pixel to adjacent sub-pixels. It is understandable that the arrangement of sub-pixels in OLED display panels is diverse and not limited to... Figure 2 As shown in the arrangement, for any white sub-pixel, there may be one, two or more other color sub-pixels adjacent to it, depending on the position of the white sub-pixel and the pixel arrangement. For example, a white sub-pixel in the central area may be adjacent to at least two other color sub-pixels, while a white sub-pixel at the edge may be adjacent to only one other color sub-pixel.

[0067] For example, Figure 3 Taking a white light-emitting unit 814 located between the first light-emitting unit 81a and the second light-emitting unit 81b, where the first light-emitting unit 81a is a red light-emitting unit 811 and the second light-emitting unit 81b is a blue light-emitting unit as an example, in this case, as Figure 2 and Figure 3As shown, white sub-pixel W and red sub-pixel R can be defined as a group of target adjacent sub-pixels, and white sub-pixel W and blue sub-pixel B can be defined as another group of target adjacent sub-pixels. Further, the portions of the pixel defining layer 40 located between white light-emitting unit 814 and red light-emitting unit 811, and between white light-emitting unit 814 and blue light-emitting unit 812, are defined as the first defining portion 410. By providing a first groove 311 in the transparent optical adhesive layer 30 at the corresponding position, the first defining portion 410 forms a first recess 411, and a portion of the first cathode portion 510 is located within the first recess 411, forming a reflective electrode. Figure 3 The light path indicated by the black arrow in the middle utilizes the first cathode portion 510 within the first recess 411 to reflect the light leakage from the white light-emitting unit 814 to the adjacent white light-emitting unit 811 and blue light-emitting unit 812, ensuring the saturation of the red and blue sub-pixels.

[0068] It should be noted that, Figure 2 The color types of the sub-pixels shown, and the arrangement of sub-pixels of different colors, are for illustrative purposes only and do not constitute a limitation of this application. In other embodiments, the target adjacent sub-pixels can be adjacent sub-pixels of other colors, and the emitted light colors of two adjacent sub-pixels can be different or the same; this utility model embodiment does not limit this. For adjacent sub-pixels with different emitted light colors, the technical solution of this utility model embodiment can prevent color mixing between adjacent sub-pixels of different colors due to light leakage; for adjacent sub-pixels with the same emitted light color, the technical solution of this utility model embodiment can reduce the deviation between the emitted light brightness of each sub-pixel and the preset target brightness.

[0069] In summary, this embodiment of the invention provides a first groove in the transparent optical adhesive layer through the non-opening area of ​​the corresponding pixel limiting layer. A portion of the first limiting portion corresponding to the first groove in the pixel limiting layer is filled into the first groove, forming a first recess on the first limiting portion. Subsequently, a portion of the first cathode portion corresponding to the first limiting portion in the cathode layer covers the first recess. Thus, a reflective electrode can be formed using the cathode layer located in the first recess. The reflective effect of the reflective electrode reduces or even avoids light leakage between adjacent sub-pixels, thereby improving the display effect.

[0070] In one embodiment, such as Figure 4 As shown, along the first direction Z, the depth of the first recess 411 is greater than the depth of the first groove 311. By increasing the depth of the first recess 411, the coverage depth of the first cathode portion 510 in the first direction Z can be increased, further improving the effect of blocking light leakage between adjacent sub-pixels.

[0071] In one embodiment, such as Figure 4As shown, the first limiting portion 410 is provided with a second groove 403. Along the first direction Z, the projection of the second groove 403 overlaps with that of the first groove 311. The depth of the first recess 411 is equal to the sum of the depths of the first groove 311 and the second groove 403.

[0072] Specifically, in this embodiment, by providing a second groove 403 corresponding to the first groove 311 in the first limiting portion 410, the recess depth of the first limiting portion 410 can include not only the depth (h) that naturally sinks due to the presence of the first groove 311, but also the depth (d) of the second groove 403 itself. This can further increase the depth of the first recess 411, making the depth of the first recess 411 equal to the sum of the depths of the first groove 311 and the second groove 403 (i.e., h+d). This further increases the coverage depth of the cathode layer 50 located in the first recess 411 in the first direction Z, blocking light leakage between adjacent sub-pixels and improving the display effect.

[0073] In one embodiment, such as Figure 4 As shown, along the first direction Z, the depth d of the second groove 403 is less than the thickness of the pixel defining layer 40. In this case, the second groove 403 does not penetrate the pixel defining layer 40.

[0074] In other embodiments, such as Figure 5 As shown, along the first direction Z, the depth d of the second groove 403 is equal to the thickness of the pixel defining layer 40. At this time, the second groove 403 penetrates the pixel defining layer 40.

[0075] In one embodiment, such as Figure 3 As shown, the cathode layer 50 also includes a second cathode portion 520, which is located within the pixel opening 401; along the first direction Z, the first cathode portion 510 located within the first recess 411 includes opposing first surfaces F1 and second surfaces F2, with the first surface F1 located on the side of the second surface F2 near the substrate 10; the second cathode portion 520 includes opposing third surfaces F3 and fourth surfaces F4, with the third surface F3 located on the side of the fourth surface F4 near the substrate 10; the first surface F1 is at least located on the side of the third surface F3 near the substrate 10.

[0076] Specifically, the second cathode portion 520 refers to the part of the cathode layer 50 located within the pixel opening 401, covering the light-emitting unit 81.

[0077] Specifically, the first surface F1 of the first cathode portion 510 refers to the bottom surface of the first cathode portion 510, that is, the surface of the first cathode portion 510 closest to the substrate 10. The third surface F3 of the second cathode portion 520 refers to the bottom surface of the second cathode portion 520, that is, the surface of the second cathode portion 520 closest to the substrate. The first surface F1 is located at least on the side of the third surface F3 closest to the substrate 10. That is, the bottom surface of the first cathode portion 510 is located at any depth below the bottom surface of the second cathode portion 520. As long as the bottom surface of the first cathode portion 510 is below the bottom surface of the second cathode portion 520, it is sufficient to ensure that the first cathode portion 510 has a certain coverage depth in the first direction Z, effectively reducing light leakage between adjacent sub-pixels.

[0078] Preferably, such as Figure 5 As shown, along the first direction Z, the anode structure 701 includes a fifth surface F5 and a sixth surface F6 facing each other, with the fifth surface F5 located on the side of the sixth surface F6 closer to the substrate 10; the first surface F1 is located on the side of the fifth surface F5 closer to the substrate 10. This arrangement allows the bottom surface of the first cathode portion 510 to be located below the bottom surface of the anode layer 70, further increasing the coverage depth of the first cathode portion 510 in the first direction Z and preventing light leakage between adjacent sub-pixels.

[0079] Specifically, if the depth of the transparent optical adhesive layer 30 is sufficient, the depth of the first recess 411 can be increased by increasing the depth of the first groove 311 (as long as the bottom surface of the first groove 311 is located on the side of the bottom surface of the color filter layer 20 away from the substrate 10), so that the bottom surface of the first cathode portion 510 is located below the bottom surface of the anode layer 70. Alternatively, the depth of the first recess 411 can be increased by providing a groove (such as the second groove 403 mentioned above) on the first defined portion 410, so that the bottom surface of the first cathode portion 510 is located below the bottom surface of the anode layer 70. This embodiment of the present invention does not limit this.

[0080] Based on the same design concept, this utility model embodiment also provides a display device. For example... Figure 6 As shown, the display device 200 includes the display panel 100 provided in any of the above embodiments, and therefore has the same beneficial effects as the above display panel. The similarities can be found in the description of the above embodiments, and will not be repeated here. This display device 200 is a bottom-emitting OLED display device, which can be used for... Figure 6 The mobile phone shown can also be any electronic product with display function, including but not limited to the following categories: television, laptop, desktop monitor, tablet computer, digital camera, smart bracelet, smart glasses, in-vehicle display, medical equipment, industrial control equipment, touch interactive terminal, etc. This utility model embodiment does not make any special limitation in this regard.

[0081] Although embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments, but can be made in various forms, and those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential characteristics of the present invention. Therefore, it should be understood that the above embodiments are exemplary in all respects and not restrictive.

Claims

1. A display panel, characterized in that, include: Substrate; A color filter layer is located on one side of the substrate; the color filter layer includes at least two color resist units of different colors; A transparent optical adhesive layer is located on the side of the color filter layer away from the substrate; A pixel defining layer is located on the side of the transparent optical adhesive layer away from the substrate; the pixel defining layer is provided with pixel openings, and at least a portion of the pixel openings overlap with the projection of the color resist unit along a first direction; the first direction is perpendicular to the plane where the substrate is located; A cathode layer is located on the side of the pixel defining layer away from the substrate; The transparent optical adhesive layer has a first groove, the pixel defining layer includes a first defining portion, and the cathode includes a first cathode portion. Along the first direction, the projections of the first groove, the first defining portion, and the first cathode portion overlap, and all of them overlap with the projection of the non-opening area of ​​the pixel defining layer. A portion of the first defining portion is located in the first groove to form a first recess. A portion of the first cathode portion is located in the first recess to form a reflective electrode.

2. The display panel according to claim 1, characterized in that, The display panel further includes a light-emitting layer, which includes a plurality of light-emitting units located within the pixel openings; The light-emitting unit includes a white light-emitting unit. Along the first direction, the white light-emitting unit overlaps with the projection of the transparent optical adhesive layer, but does not overlap with the color resist unit. Along a direction parallel to the plane of the substrate, the first recess is located on at least one side of the white light-emitting unit.

3. The display panel according to claim 2, characterized in that, The light-emitting unit further includes a first light-emitting unit and a second light-emitting unit; The white light-emitting unit is disposed adjacent to the first light-emitting unit, and the first recess is located between the white light-emitting unit and the first light-emitting unit; and / or, The white light-emitting unit is disposed adjacent to the second light-emitting unit, and the first recess is located between the white light-emitting unit and the second light-emitting unit; The first light-emitting unit and the second light-emitting unit emit different colors.

4. The display panel according to claim 1, characterized in that, Along the first direction, the depth of the first recess is equal to the depth of the first groove.

5. The display panel according to claim 1, characterized in that, Along the first direction, the depth of the first recess is greater than the depth of the first groove.

6. The display panel according to claim 5, characterized in that, The first defined portion is provided with a second groove, and along the first direction, the projection of the second groove overlaps with that of the first groove, and the depth of the first recess is equal to the sum of the depths of the first groove and the second groove.

7. The display panel according to claim 6, characterized in that, Along the first direction, the depth of the second groove is less than or equal to the thickness of the pixel defining layer.

8. The display panel according to claim 1, characterized in that, The cathode layer further includes a second cathode portion, which is located within the pixel opening; Along the first direction, the first cathode portion located within the first recess includes opposing first and second surfaces, with the first surface located on the side of the second surface closer to the substrate; the second cathode portion includes opposing third and fourth surfaces, with the third surface located on the side of the fourth surface closer to the substrate. The first surface is located at least on the side of the third surface closest to the substrate.

9. The display panel according to claim 8, characterized in that, The display panel further includes an anode layer, which is located between the transparent optical adhesive layer and the pixel defining layer. The anode layer includes a plurality of anode structures, and the pixel opening exposes a portion of the anode structures. Along the first direction, the anode structure includes opposing fifth and sixth surfaces, the fifth surface being located on the side of the sixth surface closer to the substrate; The first surface is located on the side of the fifth surface closer to the substrate.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1-9.

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