Display panel and display device

Abstract

The invention provides a display panel and a display device, the display panel comprises a substrate, a pixel definition layer and a light emitting layer, the pixel definition layer is arranged on one side of the substrate, and the pixel definition layer comprises a plurality of pixel openings; the light-emitting layer is arranged on one side of the substrate, and at least part of the light-emitting layer is located in the pixel opening; the surface of the side, away from the substrate, of the light-emitting layer comprises a first protruding part, and the orthographic projection of the first protruding part on the substrate is located in the orthographic projection of the pixel opening on the substrate. According to the display panel provided by the invention, the first convex part is arranged on the light emitting layer, so that the direction of the light rays emitted by the light emitting layer can be changed, the intensity of the reflected light rays returning along the original path is also reduced, and the reflectivity in the screen body can be reduced.

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] Organic Light Emitting Diode (OLED) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the current display panels have a high reflectivity, which results in insufficient blackness when the display panel is turned off. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a display panel and a display device that help to reduce reflectivity and improve performance.

[0005] Based on the above purpose, the present application provides a display panel, which includes:

[0006] substrate;

[0007] A pixel definition layer, disposed on one side of the substrate, the pixel definition layer comprising a plurality of pixel openings;

[0008] A light-emitting layer is arranged on one side of the substrate, and the light-emitting layer is at least partially located at the pixel opening; the surface of the light-emitting layer away from the substrate includes a first protrusion, and the orthographic projection of the first protrusion on the substrate is located within the orthographic projection of the pixel opening on the substrate.

[0009] In a possible implementation, the display panel further includes:

[0010] A coating layer, wherein a surface of the coating layer away from the substrate comprises a second protrusion, and an orthographic projection of the second protrusion on the substrate at least partially overlaps with an orthographic projection of the first protrusion on the substrate;

[0011] Preferably, the coating layer is disposed between the substrate and the light-emitting layer;

[0012] Preferably, the coating layer comprises an organic layer;

[0013] Preferably, the coating layer further includes a first inorganic layer and a second inorganic layer, and the first inorganic layer and the second inorganic layer are disposed on opposite sides of the organic layer.

[0014] In a possible implementation, the display panel further includes:

[0015] A light shielding layer is disposed on a side of the pixel definition layer away from the substrate, the light shielding layer comprises a plurality of light-transmitting openings, and the orthographic projections of the light-transmitting openings on the substrate at least partially overlap with the orthographic projections of the pixel openings on the substrate;

[0016] Preferably, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the light-transmitting opening on the substrate.

[0017] In a possible implementation manner, the light shielding layer includes a black matrix, and the black matrix encloses a plurality of light-transmitting openings;

[0018] Preferably, the orthographic projection of the black matrix on the substrate at least partially overlaps with the orthographic projection of the pixel definition layer on the substrate;

[0019] Preferably, the black matrix comprises a black light absorbing material;

[0020] Preferably, the pixel definition layer comprises a black light absorbing material.

[0021] In a possible implementation, the display panel further includes:

[0022] A filter layer is disposed on a side of the light-emitting layer away from the substrate, and an orthographic projection of the light-emitting layer on the substrate at least partially overlaps with an orthographic projection of the filter layer on the substrate;

[0023] Preferably, the orthographic projection of the light-emitting layer on the substrate is located within the orthographic projection of the filter layer on the substrate;

[0024] Preferably, an orthographic projection of the filter layer on the substrate at least partially overlaps with an orthographic projection of the pixel definition layer on the substrate.

[0025] In a possible implementation, the display panel further includes:

[0026] An encapsulation layer is disposed on a side of the pixel definition layer away from the substrate;

[0027] Preferably, the encapsulation layer comprises an organic encapsulation layer;

[0028] Preferably, a size of the encapsulation layer in a direction perpendicular to the substrate is not less than 14 μm.

[0029] In a possible implementation manner, the first protrusion includes a slope surface and a crest, and the distance between the crest and the substrate is greater than the distance between the slope surface and the substrate;

[0030] Preferably, the distance between the wave crest and the substrate is not less than the distance between the surface of the pixel definition layer away from the substrate and the substrate;

[0031] Preferably, the size of the wave crest in a direction parallel to the substrate is comprised between 0.5 and 1.5 μm;

[0032] Preferably, the distance between the wave crest and the substrate is not less than 3.5 μm;

[0033] Preferably, the slope surface is inclined at an angle of not less than 29° relative to the plane where the substrate is located.

[0034] In a possible implementation manner, a plurality of the first protrusions are disposed in the pixel opening;

[0035] Preferably, the number of the first protrusions in the pixel opening is proportional to the opening size of the pixel opening.

[0036] In a possible implementation manner, the light-emitting layer includes a first electrode, and the orthographic projection of the coating layer on the substrate overlaps with the orthographic projection of the first electrode on the substrate;

[0037] Preferably, the light-emitting layer further comprises a light-emitting material layer and a second electrode, and the first electrode, the light-emitting material layer and the second electrode are sequentially stacked in a direction away from the substrate;

[0038] Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode;

[0039] Preferably, the light-emitting layer comprises a plurality of light-emitting units arranged at intervals, and at least a portion of the light-emitting units are located at the corresponding pixel openings;

[0040] Preferably, a surface of the light emitting unit away from the substrate includes a plurality of first protrusions.

[0041] Based on the same inventive concept, the present application also provides a display device, which includes the above-mentioned display panel.

[0042] Compared with the prior art, the display panel provided in the present application can change the direction of light emitted by the light-emitting layer by setting a first protrusion on the light-emitting layer, and also reduce the intensity of the reflected light returning along the original path, which helps to reduce the reflectivity inside the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a schematic diagram of a related display panel;

[0045] Figure 2 A schematic diagram of the structure of a display panel provided in one embodiment of the present application;

[0046] Figure 3 A schematic diagram of the structure of a display panel provided in another embodiment of the present application;

[0047] Figure 4 A schematic diagram of the structure of a display panel provided in another embodiment of the present application;

[0048] Figure 5 A schematic diagram of the structure of a display panel provided in another embodiment of the present application;

[0049] Figure 6 A schematic diagram of a partial structure of a display panel provided in another embodiment of the present application;

[0050] Figure 7 A schematic diagram of the structure of a display panel provided in another embodiment of the present application.

[0051] Marking Description:

[0052] 100. Display panel;

[0053] 1. Substrate; 2. Pixel definition layer; 21. Pixel opening; 3. Light-emitting layer; 301. First protrusion; 302. Slope surface; 303. Crest; 30. Light-emitting unit; 31. First electrode; 4. Polarizer; 5. Coating layer; 501. Second protrusion; 6. Shading layer; 60. Black matrix; 61. Light-transmitting opening; 7. Filter layer; 8. Encapsulation layer. DETAILED DESCRIPTION

[0054] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0055] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] The in-vehicle display device has high requirements for integrated black, and the decisive factor for integrated black is reflectivity. The display module includes a screen body (i.e., display panel) and a cover plate covering the screen body. The higher the reflectivity of the screen body, the higher the reflectivity of the display module. The commonly used solution at present is to perform AR (Anti-Reflection) treatment on the surface of the cover plate.

[0057] Reference Figure 1 , is a schematic diagram of the structure of a related display panel, the display panel 100 includes a substrate 1, a pixel definition layer 2 and a light emitting layer 3, the pixel definition layer 2 includes a plurality of pixel openings 21, the light emitting layer 3 is partially located in the pixel openings 21, and the surface of the light emitting layer 3 away from the substrate 1 is a plane. The display panel 100 also includes a polarizer 4 located on the side of the light emitting layer 3 away from the substrate 1.

[0058] After long-term research, the inventors found that the relevant technology cannot reduce the reflectivity inside the display panel 100, especially in the future curling application, the thickness of the polarizer 4 is too large to meet the curling requirements. However, if the polarizer 4 is removed, the reflectivity of the display panel 100 will be higher. Therefore, there is a problem that the reflectivity of the screen is too high after the polarizer 4 is removed.

[0059] Based on this, the present application provides a display panel solution, as detailed in the following embodiments.

[0060] Reference Figure 2 As shown, an embodiment of the present application provides a display panel, which includes a substrate 1 and a pixel definition layer 2 and a light-emitting layer 3 arranged on one side of the substrate 1. The pixel definition layer 2 includes a plurality of pixel openings 21, and the light-emitting layer 3 is at least partially located in the pixel opening 21.

[0061] The surface of the light emitting layer 3 away from the substrate 1 includes a first protrusion 301 , and the orthographic projection of the first protrusion 301 on the substrate 1 is located within the orthographic projection of the pixel opening 21 on the substrate 1 .

[0062] The display panel 100 provided in this embodiment can change the direction of the light emitted by the light emitting layer 3 by providing the first protrusion 301 on the light emitting layer 3, and also reduce the intensity of the reflected light returning along the original path, which helps to reduce the reflectivity inside the screen body. The first protrusion 301 can increase the propagation distance and complexity of the light inside the screen body, improve the absorption probability inside the screen body, and reduce the amount of reflected light. In addition, the first protrusion 301 also destroys the conditions that may form mirror reflection, making the reflected light more dispersed, reducing the reflectivity, and improving the integrated black effect, thereby improving the performance of the display panel 100.

[0063] Reference Figure 3 As shown, in one embodiment, the display panel 100 further includes a coating layer 5, and the surface of the coating layer 5 away from the substrate 1 includes a second protrusion 501, and the orthographic projection of the second protrusion 501 on the substrate 1 at least partially overlaps with the orthographic projection of the first protrusion 301 on the substrate 1.

[0064] Optionally, the coating layer 5 is disposed between the substrate 1 and the light-emitting layer 3 .

[0065] Optionally, the coating layer 5 includes an organic layer.

[0066] Optionally, the coating layer 5 further includes a first inorganic layer and a second inorganic layer, and the first inorganic layer and the second inorganic layer are arranged on opposite sides of the organic layer.

[0067] Specifically, the coating layer 5 is an OC layer. The coating layer 5 can be made of an optical glue composed of an organic material, and the second protrusion 501 is formed by direct exposure, development and etching. It can also be formed by stacking a first inorganic layer, an organic layer, and a second inorganic layer in sequence. After the second protrusion 501 is formed on the coating layer 5, the light-emitting layer 3 is formed on the side of the coating layer 5 away from the substrate 1, and the first protrusion 301 is formed at the position of the light-emitting layer 3 corresponding to the second protrusion 501, that is, the orthographic projection of the second protrusion 501 on the substrate 1 overlaps with the orthographic projection of the first protrusion 301 on the substrate 1.

[0068] Reference Figure 4As shown, in one embodiment, the display panel 100 further includes a light shielding layer 6, which is disposed on a side of the pixel definition layer 2 away from the substrate 1, and includes a plurality of light-transmitting openings 61, and the orthographic projection of the light-transmitting openings 61 on the substrate 1 at least partially overlaps with the orthographic projection of the pixel opening 21 on the substrate 1. Specifically, the positions of the light-transmitting openings 61 and the pixel openings 21 correspond to each other, and the numbers also correspond one to one. Accordingly, the first protrusion 301 in the pixel opening 21 corresponds to the position of the light-transmitting openings 61, and the light-emitting units in the pixel openings 21 correspond one to one to the light-transmitting openings 61.

[0069] Optionally, the orthographic projection of the pixel opening 21 on the substrate 1 is located within the orthographic projection of the light-transmitting opening 61 on the substrate 1 .

[0070] Among them, by reasonably designing the relative positions of the light-transmitting opening 61 of the light-shielding layer 6 and the pixel opening 21, the light-shielding layer 6 can block light in a certain direction. For example, the light-shielding layer 6 can effectively block part of the light reflected by the first protrusion 301, reduce the total amount of reflected light, improve the contrast of the display panel 100, and further reduce the reflectivity, so that the display panel 100 is purer when displaying black or dark tones, and improve the integrated black effect.

[0071] Furthermore, in one embodiment, the light shielding layer 6 includes a black matrix 60 , and the black matrix 60 encloses a plurality of light-transmitting openings 61 .

[0072] Optionally, the orthographic projection of the black matrix 60 on the substrate 1 at least partially overlaps with the orthographic projection of the pixel definition layer 2 on the substrate 1 .

[0073] Optionally, the black matrix 60 includes a black light absorbing material.

[0074] Optionally, the pixel definition layer 2 comprises a black light absorbing material.

[0075] When external light enters the display panel 100, the unnecessary light can be absorbed by the black matrix 60. In addition, the material of the pixel definition layer 2 can be a black light-absorbing material, and the pixel definition layer 2 can be a black pixel definition layer, which can absorb part of the light reflected by the first protrusion 301. At this time, the pixel definition layer 2 between two adjacent pixel openings 21 is reused as a light-absorbing member, which can prevent light leakage between sub-pixels corresponding to each light-emitting unit, and ensure that each pixel emits light independently and accurately.

[0076] Continue to refer to Figure 4 As shown, in one embodiment, the display panel 100 further includes a filter layer 7, which is disposed on a side of the light-emitting layer 3 away from the substrate 1, and the orthographic projection of the light-emitting layer 3 on the substrate 1 at least partially overlaps with the orthographic projection of the filter layer 7 on the substrate 1.

[0077] Optionally, the orthographic projection of the light-emitting layer 3 on the substrate 1 is located within the orthographic projection of the filter layer 7 on the substrate 1 .

[0078] Optionally, the orthographic projection of the filter layer 7 on the substrate 1 at least partially overlaps with the orthographic projection of the pixel definition layer 2 on the substrate 1 .

[0079] Optionally, the transmittance of the filter layer 7 is 38%-42%. For example, the transmittance of the filter layer 7 can be 38%, 39%, 40%, 41%, 42%, etc.

[0080] Among them, by setting the filter layer 7 on the side of the light-emitting layer 3 away from the substrate 1, the polarizer can be replaced to reduce the thickness of the display panel 100 and improve the display effect of the display panel 100. The filter layer 7 can reduce the transmittance, reduce the entry of external light and the reflection of internal light, and enhance the readability of the front viewing angle. The filter layer 7 cooperates with the light-shielding layer 6 or the pixel definition layer 2 to effectively reduce the reflectivity of the screen while ensuring the display effect, adapting to scenes such as vehicle-mounted displays that require a high integrated black effect, improving the display quality, and in the future application of curled vehicle-mounted products, overcoming the limitation that the polarizer cannot be used due to the thickness problem.

[0081] Reference Figure 5 As shown, in one embodiment, the display panel 100 further includes an encapsulation layer 8 , and the encapsulation layer 8 is disposed on a side of the pixel definition layer 2 away from the substrate 1 .

[0082] Optionally, the encapsulation layer 8 includes an organic encapsulation layer, which is specifically made by an inkjet printing (IJP) process.

[0083] Optionally, the size of the encapsulation layer 8 in the direction perpendicular to the substrate 1 is not less than 14 μm. That is, the thickness of the encapsulation layer 8 is greater than or equal to 14 μm.

[0084] Reference Figure 6 As shown, in one embodiment, the first protrusion 301 includes a slope surface 302 and a crest 303, and the distance between the crest 303 and the substrate 1 is greater than the distance between the slope surface 302 and the substrate 1.

[0085] Optionally, the distance H between the wave crest 303 and the substrate 1 is 1 Not less than the distance between the surface of the pixel definition layer 2 away from the substrate 1 and the substrate 1 .

[0086] Optionally, the dimension B of the peak 303 in the direction parallel to the substrate 1 is 0.5-1.5 μm. For example, in the direction parallel to the substrate 1, the width of the peak 303 may be 0.5 μm, 0.7 μm, 1 μm, 1.2 μm, 1.5 μm, etc.

[0087] Optionally, the angle at which the slope surface 302 is inclined relative to the plane where the substrate 1 is located is the Tape angle a, and the Tape angle a is not less than 29°. Specifically, the first protrusion 301 forms a trapezoidal structure, and the bottom angle of the trapezoidal structure is the Tape angle a.

[0088] Optionally, the distance H between the wave crest 303 and the substrate 1 is 1 For example, the distance H between the peak 303 and the substrate 1 is 1 , that is, the protrusion height, can be 3.8μm. The higher the peak 303 of the first protrusion 301, the more obvious the change in the light propagation path, which can more effectively reduce the direct reflection of light out of the screen, thereby significantly reducing the reflectivity of the screen, which is especially beneficial for the use of vehicle-mounted display screens in outdoor strong light scenes. At the same time, higher protrusions help improve light extraction efficiency and increase the brightness of the display screen, making it perform well in high-brightness display demand scenarios. In addition, the protrusion height can be optimized in coordination with the pixel aperture ratio to achieve a balance between optical performance and process cost.

[0089] Reference Figure 2 , Figure 7 As shown, in some embodiments, a plurality of first protrusions 301 are disposed in the pixel opening 21. The number of the first protrusions 301 in the pixel opening 21 may be two or more than two.

[0090] Optionally, the number of the first protrusions 301 in the pixel opening 21 is proportional to the size of the pixel opening 21. Specifically, the larger the size of the pixel opening 21 in the direction parallel to the substrate 1, the more the number of the first protrusions 301 is provided accordingly.

[0091] Reference Figure 3 As shown, in one embodiment, the light-emitting layer 3 includes a first electrode 31 , and the orthographic projection of the coating layer 5 on the substrate 1 overlaps with the orthographic projection of the first electrode 31 on the substrate 1 .

[0092] Furthermore, the light-emitting layer 3 further includes a light-emitting material layer and a second electrode. The first electrode 31 , the light-emitting material layer and the second electrode are sequentially stacked in a direction away from the substrate 1 .

[0093] Optionally, the first electrode 31 includes an anode, and the second electrode includes a cathode.

[0094] Optionally, the light emitting layer 3 includes a plurality of light emitting units 30 arranged at intervals, and at least a portion of the light emitting units 30 is located at the corresponding pixel openings 21. The light emitting units 30 correspond to the pixel openings 21 one by one.

[0095] Optionally, the surface of the light emitting unit 30 away from the substrate 1 includes a plurality of first protrusions 301 .

[0096] Specifically, the plurality of pixel openings 21 are respectively provided with light emitting units 30 of different colors to enhance the richness of the display of the display panel 100. Exemplarily, the light emitting units 30 of different colors include light emitting units R, B and G.

[0097] Specifically, a protruding structure is formed by using the coating layer 5 at the anode position of each light-emitting unit 30 , and the anode and the protrusion on the coating layer 5 present an accurate position correspondence in the vehicle-mounted display screen.

[0098] Among them, the light generated by the light-emitting unit 30 is directly affected by the first protrusion 301 at the beginning. The first protrusion 301 guides the scattering and refraction of light by changing the local optical environment, effectively reducing the number of reflections of light in the screen body, avoiding disordered reflections, and making the light propagate along an optimized path, thereby reducing reflectivity and improving display effects.

[0099] Another embodiment of the present application provides a display device, which includes the display panel 100 in the above embodiment. The display device can be on a smart device (such as a mobile phone, VR device, computer, television, car display, etc.).

[0100] The display device in this embodiment, by providing the first protrusion 301 on the light emitting layer 3, can change the direction of the light emitted by the light emitting layer 3, and also reduce the intensity of the reflected light returning along the original path, which helps to reduce the reflectivity inside the screen body. The first protrusion 301 can increase the propagation distance and complexity of the light inside the screen body, improve the absorption probability inside the screen body, and reduce the amount of reflected light. In addition, the first protrusion 301 also destroys the conditions that may form mirror reflection, making the reflected light more dispersed, reducing the reflectivity, and improving the integrated black effect, thereby improving the performance of the display panel 100.

[0101] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0102] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0103] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A pixel definition layer, disposed on one side of the substrate, the pixel definition layer comprising a plurality of pixel openings; A light-emitting layer is disposed on one side of the substrate, wherein at least a portion of the light-emitting layer is located in the pixel opening; A surface of the light emitting layer away from the substrate comprises a first protrusion, and an orthographic projection of the first protrusion on the substrate is located within an orthographic projection of the pixel opening on the substrate.

2. The display panel according to claim 1, wherein: The display panel further includes: A coating layer, wherein a surface of the coating layer away from the substrate comprises a second protrusion, and an orthographic projection of the second protrusion on the substrate at least partially overlaps with an orthographic projection of the first protrusion on the substrate; Preferably, the coating layer is disposed between the substrate and the light-emitting layer; Preferably, the coating layer comprises an organic layer; Preferably, the coating layer further includes a first inorganic layer and a second inorganic layer, and the first inorganic layer and the second inorganic layer are disposed on opposite sides of the organic layer.

3. The display panel according to claim 1, wherein: The display panel further includes: A light shielding layer is disposed on a side of the pixel definition layer away from the substrate, the light shielding layer comprises a plurality of light-transmitting openings, and the orthographic projections of the light-transmitting openings on the substrate at least partially overlap with the orthographic projections of the pixel openings on the substrate; Preferably, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the light-transmitting opening on the substrate.

4. The display panel according to claim 3, wherein: The light shielding layer includes a black matrix, and the black matrix encloses a plurality of light-transmitting openings; Preferably, the orthographic projection of the black matrix on the substrate at least partially overlaps with the orthographic projection of the pixel definition layer on the substrate; Preferably, the black matrix comprises a black light absorbing material; Preferably, the pixel definition layer comprises a black light absorbing material.

5. The display panel according to claim 1, wherein: The display panel further includes: A filter layer is disposed on a side of the light-emitting layer away from the substrate, and an orthographic projection of the light-emitting layer on the substrate at least partially overlaps with an orthographic projection of the filter layer on the substrate; Preferably, the orthographic projection of the light-emitting layer on the substrate is located within the orthographic projection of the filter layer on the substrate; Preferably, an orthographic projection of the filter layer on the substrate at least partially overlaps with an orthographic projection of the pixel definition layer on the substrate.

6. The display panel according to claim 1, wherein: The display panel further includes: An encapsulation layer is disposed on a side of the pixel definition layer away from the substrate; Preferably, the encapsulation layer comprises an organic encapsulation layer; Preferably, a size of the encapsulation layer in a direction perpendicular to the substrate is not less than 14 μm.

7. The display panel according to claim 1, wherein: The first protrusion includes a slope surface and a crest, and the distance between the crest and the substrate is greater than the distance between the slope surface and the substrate; Preferably, the distance between the wave crest and the substrate is not less than the distance between the surface of the pixel definition layer away from the substrate and the substrate; Preferably, the size of the wave crest in a direction parallel to the substrate is comprised between 0.5 and 1.5 μm; Preferably, the distance between the wave crest and the substrate is not less than 3.5 μm; Preferably, the slope surface is inclined at an angle of not less than 29° relative to the plane where the substrate is located.

8. The display panel according to claim 1, wherein: A plurality of the first protrusions are arranged in the pixel opening; Preferably, the number of the first protrusions in the pixel opening is proportional to the opening size of the pixel opening.

9. The display panel according to claim 2, wherein: The light-emitting layer includes a first electrode, and the orthographic projection of the coating layer on the substrate overlaps with the orthographic projection of the first electrode on the substrate; Preferably, the light-emitting layer further comprises a light-emitting material layer and a second electrode, and the first electrode, the light-emitting material layer and the second electrode are sequentially stacked in a direction away from the substrate; Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode; Preferably, the light-emitting layer comprises a plurality of light-emitting units arranged at intervals, and at least a portion of the light-emitting units are located at the corresponding pixel openings; Preferably, a surface of the light emitting unit away from the substrate includes a plurality of first protrusions.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 9.

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