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 device, the pixel definition layer is arranged on one side of the substrate, and the pixel definition layer comprises a plurality of pixel openings; a first concave-convex structure is arranged on the surface of the side, facing the pixel opening, of the pixel defining layer, and at least part of the light-emitting device is located in the pixel opening. According to the display panel provided by the invention, the first concave-convex structure is introduced into the pixel definition layer, so that the light-emitting efficiency of the light-emitting device at a low gray scale can be reduced, the display effect of the display panel is further improved, and the display quality is improved.

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] AMOLED (Active Matrix Organic Light Emitting Diode) displays are widely used in devices such as smartphones, tablets, and TVs due to their excellent display performance, such as high contrast, fast response time, and low power consumption. However, AMOLED screens may have display problems such as uneven brightness of the display panel (Mura) during manufacturing and use. Summary of the invention

[0003] In view of this, an object of the present application is to provide a display panel and a display device, which can improve display quality.

[0004] Based on the above purpose, the present application provides a display panel, which includes:

[0005] substrate;

[0006] A pixel definition layer is disposed on one side of the substrate, and the pixel definition layer includes a plurality of pixel openings; a first concave-convex structure is disposed on a surface of the pixel definition layer facing the pixel openings;

[0007] A light emitting device is at least partially located within the pixel opening.

[0008] In one embodiment, the light emitting device comprises:

[0009] A first electrode is disposed between the substrate and the pixel definition layer, wherein the first electrode is at least partially exposed to the pixel opening;

[0010] a light-emitting functional layer, arranged on a side of the first electrode away from the substrate, wherein at least a portion of the light-emitting functional layer is located within the pixel opening; the light-emitting functional layer comprises a second concave-convex structure conformal to the first concave-convex structure;

[0011] A second electrode is disposed on a side of the light-emitting functional layer away from the substrate, wherein at least a portion of the second electrode is located within the pixel opening; the second electrode comprises a third concave-convex structure conformal to the second concave-convex structure;

[0012] Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode.

[0013] In one embodiment, the light-emitting functional layer includes a light-emitting material layer and a hole injection layer, and the light-emitting material layer is arranged between the hole injection layer and the second electrode; the second concave-convex structure includes a concave-convex portion arranged on the hole injection layer, and the concave-convex portion contacts the third concave-convex structure to form a conductive path;

[0014] Preferably, the light-emitting functional layer further comprises:

[0015] A hole transport layer, disposed between the hole injection layer and the light emitting material layer;

[0016] An electron blocking layer, disposed between the hole transport layer and the light emitting material layer;

[0017] a hole blocking layer, disposed between the light-emitting material layer and the second electrode;

[0018] an electron transport layer, disposed between the hole blocking layer and the second electrode;

[0019] The electron injection layer is disposed between the electron transport layer and the second electrode.

[0020] In one embodiment, the surface of the pixel definition layer away from the substrate includes an extended surface, and the first concave-convex structure is also arranged on the extended surface.

[0021] In one embodiment, the first concave-convex structure is arranged around the pixel opening;

[0022] Preferably, the orthographic projection of the region where the first concave-convex structure is located on the substrate is in a ring shape;

[0023] Preferably, the first concavo-convex structure includes a plurality of pits.

[0024] In one embodiment, the first concavo-convex structure includes a plurality of rough areas spaced apart along the circumference of the pixel opening.

[0025] In one embodiment, the orthographic projection of the rough area on the substrate is in the shape of a strip;

[0026] Preferably, the orthographic projection of the pixel opening on the substrate includes arc corner portions and side edge portions that are alternately arranged;

[0027] Preferably, the rough area is arranged at the arc corner portion, and the rough area extends along the radial direction of the arc corner portion;

[0028] Preferably, the rough area is arranged on the side edge portion, and an extension direction of the rough area is perpendicular to an extension direction of the side edge portion.

[0029] In one embodiment, the pixel definition layer includes a first pixel definition sublayer and a second pixel definition sublayer stacked in a direction perpendicular to the substrate, the second pixel definition sublayer is arranged on a side of the first pixel definition sublayer away from the substrate, the surface roughness of the second pixel definition sublayer facing the pixel opening is greater than the surface roughness of the first pixel definition sublayer facing the pixel opening, and the first concave-convex structure is arranged on the second pixel definition sublayer;

[0030] Preferably, a surface of the first pixel definition sublayer away from the substrate is a smooth surface, and a surface of the first pixel definition sublayer facing the pixel opening is a smooth surface.

[0031] In one embodiment, the first concave-convex structure is formed by etching.

[0032] Preferably, the substrate comprises a substrate and a driving circuit layer, the driving circuit layer is arranged between the substrate and the pixel definition layer, and the driving circuit layer is electrically connected to the light-emitting device.

[0033] Based on the same inventive concept, the present application also provides a display device, which includes the above-mentioned display panel.

[0034] Compared with the prior art, the display panel provided in the present application can reduce the luminous efficiency of the light-emitting device at low grayscale by introducing a first concave-convex structure in the pixel definition layer, thereby improving the display effect of the display panel at low grayscale and improving the display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 A schematic cross-sectional structure diagram of a display panel provided in one embodiment of the present application;

[0037] Figure 2 A schematic cross-sectional structure diagram of a display panel provided in another embodiment of the present application;

[0038] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0039] Figure 4 A schematic cross-sectional structure diagram of a light-emitting device of a display panel provided in one embodiment of the present application;

[0040] Figure 5 A schematic cross-sectional structure diagram of a display panel provided in another embodiment of the present application;

[0041] Figure 6 A schematic plan view of a display panel provided in one embodiment of the present application;

[0042] Figure 7 A schematic plan view of a display panel provided in another embodiment of the present application;

[0043] Figure 8 A schematic plan view of a display panel provided in another embodiment of the present application;

[0044] Fig. 9 The comparison curve of the current density of the present application and the comparative example with the change of voltage;

[0045] Fig.10 The figure is a comparison curve of the luminous efficiency of the present application and the comparative example as a function of voltage.

[0046] Marking Description:

[0047] 100, display panel; 1, substrate; 10, underlay; 11, driving circuit layer; 2, pixel definition layer; 20, pixel opening; 201, arc corner; 202, side edge; 21, first concave-convex structure; 210, rough area; 211, side wall; 212, extension surface; 3, light-emitting device; 31, first electrode; 32, light-emitting functional layer; 320, second concave-convex structure; 3201, concave-convex part; 321, hole injection layer; 322, hole transport layer; 323, electron blocking layer; 325, light-emitting material layer; 326, hole blocking layer; 327, electron transport layer; 328, electron injection layer; 33, second electrode; 330, third concave-convex structure. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] AMOLED uses current-driven display technology, in which the brightness of each pixel is directly controlled by the current passing through the organic light-emitting diode. In the low grayscale state (corresponding to low current or low voltage), the slight fluctuation of the current has a particularly obvious impact on the image quality. Low grayscale corresponds to the grayscale level of lower brightness or darker display state. At this time, the current passing through the organic light-emitting diode is small, and the brightness of the pixel display is relatively low.

[0051] As the luminous efficiency of OLED materials increases, the Mura phenomenon caused by the slight fluctuation of current at low grayscale is becoming more and more serious. Mura refers to the phenomenon that the brightness of the display panel is uneven, causing various traces. It is mainly manifested as some uneven color and brightness patches, stripes or color blocks on the screen when displaying pure color images.

[0052] Based on this, the present application provides a solution for a display panel to solve the above problems, with specific reference to the following embodiments.

[0053] Reference Figure 1 As shown, an embodiment of the present application provides a display panel, the display panel 100 includes a substrate 1 and a pixel definition layer 2, the pixel definition layer 2 is arranged on one side of the substrate 1, and the pixel definition layer 2 includes a plurality of pixel openings 20. A first concave-convex structure 21 is arranged on a surface of the pixel definition layer 2 facing the pixel opening 20. Specifically, the first concave-convex structure 21 is at least partially located on a side wall 211 of the pixel opening 20. The display panel 100 also includes a plurality of light-emitting devices 3, and the light-emitting devices 3 are at least partially located in the pixel opening 20.

[0054] Among them, the first concavo-convex structure 21 is introduced into the pixel definition layer 2 as a rough structure, which will cause a micro short circuit between the hole injection layer on the anode side and the cathode in the subsequent evaporation process, and form a current path at the micro short circuit point, which can be equivalent to a larger resistance. At low grayscale, the equivalent resistance of the light-emitting device is closer to the resistance of the micro short circuit point, and the voltage divided by the micro short circuit point is larger, which can reduce the luminous efficiency of the light-emitting device and improve the uneven brightness at low grayscale.

[0055] In addition, at high grayscale, the equivalent resistance of the light-emitting device is small, and the resistance of the micro-short-circuit point is relatively large. The influence of the micro-short-circuit point can be ignored, and the high luminous efficiency of the light-emitting device can be maintained.

[0056] The display panel 100 provided in the embodiment of the present application can reduce the luminous efficiency of the light-emitting device at low gray scales by introducing a relatively rough first concave-convex structure 21 into the pixel definition layer 2, thereby improving the display effect of the display panel 100 at low gray scales, while maintaining the effect of high luminous efficiency at high gray scales.

[0057] Reference Figure 2 As shown, in one embodiment, the light-emitting device 3 includes a first electrode 31, a light-emitting functional layer 32, and a second electrode 33. The first electrode 31 is arranged between the substrate 1 and the pixel definition layer 2, and the first electrode 31 is at least partially exposed to the pixel opening 20. The light-emitting functional layer 32 is arranged on the side of the first electrode 31 away from the substrate 1, and the light-emitting functional layer 32 and the second electrode 33 are respectively at least partially located in the pixel opening 20. The light-emitting functional layer 32 includes a second concave-convex structure 320 conformal to the first concave-convex structure 21, wherein conformal means that the shape is consistent or close, and the position corresponds. The second electrode 33 includes a third concave-convex structure 330 conformal to the second concave-convex structure 320. Specifically, the first electrode 31 is preferably an anode, and the second electrode 33 is preferably a cathode.

[0058] Among them, after the rough first concave-convex structure 21 is introduced into the pixel definition layer 2, the rough surface formed will affect the deposition uniformity of the film layer in the subsequent evaporation process, causing some film layers in the light-emitting functional layer 32 to be very close to or directly contact the electrode on the opposite side in some local areas, thereby forming a weak short circuit point.

[0059] Further, refer to Figure 3 , Figure 4 As shown, in one embodiment, the light-emitting functional layer 32 includes a light-emitting material layer 325 and a hole injection layer 321, and the light-emitting material layer 325 is disposed between the hole injection layer 321 and the second electrode 33. The second concave-convex structure 320 includes a concave-convex portion 3201 disposed on the hole injection layer 321, and the concave-convex portion 3201 contacts the third concave-convex structure 330 to form a conductive path at the micro short-circuit point.

[0060] Preferably, the light-emitting functional layer 32 includes a hole injection layer 321, a hole transport layer 322, an electron blocking layer 323, a light-emitting material layer 325, a hole blocking layer 326, an electron transport layer 327, and an electron injection layer 328, which are sequentially stacked in a direction away from the substrate 1, that is, the hole transport layer 322 is arranged between the hole injection layer 321 and the light-emitting material layer 325, and the electron blocking layer 323 is arranged between the hole transport layer 322 and the light-emitting material layer 325. The hole blocking layer 326 is arranged between the light-emitting material layer 325 and the second electrode 33. The electron transport layer 327 is arranged between the hole blocking layer 326 and the second electrode 33. The electron injection layer 328 is arranged between the electron transport layer 327 and the second electrode 33.

[0061] Specifically, the hole injection layer 321 is located above the anode, and its function is to reduce the energy level barrier between the anode and the light-emitting material layer 325, promote the injection of holes from the anode to the light-emitting material layer 325, and improve the hole transmission efficiency. The light-emitting material layer 325 is the core layer, and when holes and electrons recombine here, light emission will occur. The electron transport layer 327 is responsible for quickly and efficiently transmitting electrons, ensuring that the electrons can smoothly reach the light-emitting material layer 325 to recombine with holes. The electron blocking layer 323 helps to block electrons, and the hole blocking layer 326 helps to block holes, so that electrons and holes can be effectively recombinated in the light-emitting material layer 325, thereby achieving stable and high-quality light emission. The layers cooperate with each other to jointly guarantee the light-emitting performance of the display panel 100.

[0062] Among them, the concavoconvex part 3201 in the hole injection layer 321 contacts the third concavoconvex structure 330 of the second electrode 33, and a conductive path can be formed at the micro-short-circuit point. The micro-short circuit is not an ideal short circuit with zero resistance. Since the micro-short-circuit point is a local abnormal conduction between the hole injection layer and the cathode caused by the rough structure of the pixel definition layer in the evaporation process, its conductive path is relatively complex and irregular, and there is a certain resistance. Compared with the normal circuit conduction path, the conductivity of the micro-short-circuit point is poor, and the hindering effect on the current is relatively large, so it can be equivalent to a larger resistance. In the light-emitting process of the light-emitting device 3, the equivalent resistance is connected in series with the light-emitting material layer 325, which will affect the current and voltage. At low grayscale, the resistance of the micro-short-circuit point is close to the resistance corresponding to the light-emitting material layer 325. According to the series voltage division principle, the micro-short-circuit point will divide more voltage, thereby reducing the light-emitting efficiency of the light-emitting device 3 and achieving improvement of the low grayscale Mura phenomenon. At high grayscale, the equivalent resistance of the light emitting device 3 is small, and the resistance of the micro short-circuit point is large. Therefore, the influence of the micro short-circuit point at high grayscale can be ignored, and the high luminous efficiency of the light emitting device 3 can be maintained.

[0063] Reference Figure 5As shown, in one embodiment, the surface of the pixel definition layer 2 away from the substrate 1 includes an extension surface 212 , the extension surface 212 is located at the outer peripheral side of the pixel opening 20 , and the first concavo-convex structure 21 is also disposed on the extension surface 212 .

[0064] Specifically, a micro short-circuit point where the concavo-convex portion 3201 and the third concavo-convex structure 330 form a conductive path may be located on the side wall 211 and / or the extension surface 212 .

[0065] Reference Figure 6 As shown, in one embodiment, the first concavo-convex structure 21 is disposed around the pixel opening 20 .

[0066] Preferably, the orthographic projection of the area where the first concavo-convex structure 21 is located on the substrate 1 is annular. Specifically, the first concavo-convex structure 21 surrounds the periphery of the pixel opening 20, and accordingly, the second concavo-convex structure 320 and the third concavo-convex structure 330 are stacked on the first concavo-convex structure 21 and are also annular.

[0067] Preferably, the first concavo-convex structure 21 includes a plurality of concave pits. The cross-sectional shape of the concave pits can be a regular shape such as a circle, an ellipse, a triangle, a polygon, etc., or can be an irregular shape.

[0068] Reference Figure 7 , Figure 8 As shown, in some embodiments, the first concavo-convex structure 21 includes a plurality of rough areas 210 arranged at intervals along the circumference of the pixel opening 20 .

[0069] In some embodiments, the orthographic projection of the rough area 210 on the substrate 1 is in the shape of a stripe.

[0070] Preferably, the orthographic projection of the pixel opening 20 on the substrate 1 includes arc corner portions 201 and side edge portions 202 that are alternately arranged.

[0071] Reference Figure 7 In one embodiment, the rough area 210 is disposed at the arc corner portion 201 , and the rough area 210 extends along the radial direction of the arc corner portion 201 .

[0072] Reference Figure 8 In another embodiment, the rough area 210 is disposed on the side portion 202 , and an extension direction of the rough area 210 is perpendicular to an extension direction of the side portion 202 .

[0073] In one embodiment, the pixel definition layer 2 includes a first pixel definition sublayer and a second pixel definition sublayer stacked in a direction perpendicular to the substrate 1, and the second pixel definition sublayer is arranged on a side of the first pixel definition sublayer away from the substrate 1. The surface roughness of the second pixel definition sublayer facing the pixel opening 20 is greater than the surface roughness of the first pixel definition sublayer facing the pixel opening 20, and the first concave-convex structure 21 is arranged on the second pixel definition sublayer.

[0074] Preferably, the surface of the first pixel definition sublayer away from the substrate 1 is a smooth surface, and the surface of the first pixel definition sublayer facing the pixel opening 20 is a smooth surface.

[0075] In one embodiment, the first concavo-convex structure 21 is formed by etching.

[0076] Specifically, the pixel definition layer 2 can be formed by selecting two different pixel definition sublayers, wherein a rougher sublayer forms the first concavoconvex structure 21. Alternatively, during the preparation of the pixel definition layer 2, the first concavoconvex structure 21 can be formed by roughening the surface of the pixel definition layer 2 using a photolithography combined with an etching process.

[0077] Preferably, the substrate 1 includes a substrate 10 and a driving circuit layer 11 , the driving circuit layer 11 is disposed between the substrate 10 and the pixel definition layer 2 , and the driving circuit layer 11 is electrically connected to the light emitting device 3 .

[0078] Specifically, the driving circuit layer 11 includes a thin film transistor (TFT), which serves as a switching element of the light emitting device 3, and its drain is connected to the first electrode 31. When the TFT is turned on, the current flowing from the power supply end to the anode of the light emitting device can be accurately controlled by the driving circuit, thereby controlling the luminous brightness of each pixel. The cathode is connected to the negative electrode of the power supply through the common electrode to form a complete current loop, so that holes and electrons are combined in the light emitting material layer of the light emitting device 3 to generate light emission, thereby realizing the image display function of the display panel 100.

[0079] Another embodiment of the present application provides a display device, which may include the display panel 100 in any of the above embodiments. For example, the display device may be any product or component with a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a laptop computer, a navigator, etc.

[0080] The display device provided in this embodiment has a display panel 100 that introduces a relatively rough first concave-convex structure 21 in the pixel definition layer 2, which can reduce the light-emitting efficiency of the light-emitting device at low grayscale, thereby improving the display effect of the display panel 100 at low grayscale.

[0081] Fig. 9The comparison curve of the current density of the present application and the comparative example with the change of voltage, wherein the vertical axis represents the current density (unit: mA / cm 2 ), the horizontal axis represents voltage (in V). There are two curves in the figure: the dark line represents the comparative example, in which the surface of the pixel definition layer is smooth. The light line represents the solution of the present application, in which the pixel definition layer has a first concave-convex structure. Fig. 9 It can be seen that as the voltage increases, the current density of the two curves increases, but the current density of the present application solution at low voltage increases more slowly, while at high voltage, the current density of the two curves tends to be close.

[0082] Fig.10 The comparison curve of the luminous efficiency of the present application and the comparative example with the change of voltage, the vertical axis represents the luminous efficiency, and the horizontal axis represents the voltage (in V). There are two curves in the figure: the dark line represents the comparative example, in which the surface of the pixel definition layer is smooth. The light line represents the present application, in which the pixel definition layer has a first concave-convex structure. Fig.10 It can be seen that the luminous efficiency of the comparative example and the present application scheme at low voltage is basically the same, but at high voltage, the luminous efficiency of the present application scheme decreases slightly, but still remains at a high level.

[0083] Therefore, according to the effect data before and after the implementation of the scheme of this application, it can be determined that introducing the first concave-convex structure in the pixel definition layer can reduce the luminous efficiency of the light-emitting device at low gray scale while maintaining the luminous efficiency at high gray scale, thereby improving the display effect of the display panel at low gray scale.

[0084] 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.

[0085] 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.

[0086] 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 first concavo-convex structure is provided on the surface of the pixel definition layer facing the pixel opening; A light emitting device is at least partially located within the pixel opening.

2. The display panel according to claim 1, wherein: The light emitting device comprises: A first electrode is disposed between the substrate and the pixel definition layer, wherein the first electrode is at least partially exposed to the pixel opening; a light-emitting functional layer, arranged on a side of the first electrode away from the substrate, wherein at least a portion of the light-emitting functional layer is located within the pixel opening; the light-emitting functional layer comprises a second concave-convex structure conformal to the first concave-convex structure; A second electrode is disposed on a side of the light-emitting functional layer away from the substrate, wherein at least a portion of the second electrode is located within the pixel opening; the second electrode comprises a third concave-convex structure conformal to the second concave-convex structure; Preferably, the first electrode comprises an anode, and the second electrode comprises a cathode.

3. The display panel according to claim 2, wherein: The light-emitting functional layer includes a light-emitting material layer and a hole injection layer, wherein the light-emitting material layer is disposed between the hole injection layer and the second electrode; the second concave-convex structure includes a concave-convex portion disposed on the hole injection layer, wherein the concave-convex portion contacts the third concave-convex structure to form a conductive path; Preferably, the light-emitting functional layer further comprises: A hole transport layer, disposed between the hole injection layer and the light emitting material layer; An electron blocking layer, disposed between the hole transport layer and the light emitting material layer; a hole blocking layer, disposed between the light-emitting material layer and the second electrode; an electron transport layer, disposed between the hole blocking layer and the second electrode; The electron injection layer is disposed between the electron transport layer and the second electrode.

4. The display panel according to claim 1, wherein: The surface of the pixel definition layer away from the substrate includes an extension surface, and the first concave-convex structure is also arranged on the extension surface.

5. The display panel according to claim 1, wherein: The first concave-convex structure is arranged around the pixel opening; Preferably, the orthographic projection of the region where the first concave-convex structure is located on the substrate is in a ring shape; Preferably, the first concavo-convex structure includes a plurality of pits.

6. The display panel according to claim 1, wherein: The first concavo-convex structure includes a plurality of rough areas arranged at intervals along a circumferential direction of the pixel opening.

7. The display panel according to claim 6, wherein: The orthographic projection of the rough area on the substrate is in the shape of a strip; Preferably, the orthographic projection of the pixel opening on the substrate includes arc corner portions and side edge portions that are alternately arranged; Preferably, the rough area is arranged at the arc corner portion, and the rough area extends along the radial direction of the arc corner portion; Preferably, the rough area is arranged on the side edge portion, and an extension direction of the rough area is perpendicular to an extension direction of the side edge portion.

8. The display panel according to claim 1, wherein: The pixel definition layer comprises a first pixel definition sublayer and a second pixel definition sublayer stacked in a direction perpendicular to the substrate, the second pixel definition sublayer is arranged on a side of the first pixel definition sublayer away from the substrate, the surface roughness of the second pixel definition sublayer facing the pixel opening is greater than the surface roughness of the first pixel definition sublayer facing the pixel opening, and the first concavo-convex structure is arranged on the second pixel definition sublayer; Preferably, a surface of the first pixel definition sublayer away from the substrate is a smooth surface, and a surface of the first pixel definition sublayer facing the pixel opening is a smooth surface.

9. The display panel according to claim 1, wherein: The first concave-convex structure is formed by etching; Preferably, the substrate comprises a substrate and a driving circuit layer, the driving circuit layer is arranged between the substrate and the pixel definition layer, and the driving circuit layer is electrically connected to the light-emitting device.

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

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