OLED display panel and display device

Abstract

The present application provides an OLED display panel and a display device, wherein the OLED display panel includes a substrate, a plurality of pixel definition layers and a light-emitting layer, wherein the plurality of pixel definition layers are formed on the substrate, a sub-pixel region is formed between adjacent pixel definition layers, and the light-emitting layer is formed on the substrate and filled in the sub-pixel region, wherein the plurality of pixel definition layers include at least one target pixel definition layer, and the side of the target pixel definition layer forms a step structure. In the OLED display panel of the present application, since there is a target pixel definition layer with a step structure on the side, when the light-emitting layer is filled in the sub-pixel region between the target pixel definition layer and the adjacent pixel definition layer, the ink climbing phenomenon will be reduced, and the ink at the edge will be more concentrated in the middle of the sub-pixel region, thereby improving the uniformity of the film thickness of the light-emitting layer and ensuring the light-emitting efficiency of the OLED display panel.

Description

Technical Field

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

[0002] like Figure 1 As shown, in current OLED display devices, the mainstream preparation method for preparing the light-emitting layer is inkjet printing, that is, the light-emitting material is dissolved in a solvent to be configured into ink, and then the ink is printed drop by drop on the sub-pixel area defined by the pixel definition layer 20 on the substrate 10 by inkjet printing to form a light-emitting layer 30.

[0003] In an ideal situation, if Figure 1 As shown in C in the figure, the thickness of the light-emitting layer 30 in the sub-pixel area will be the same everywhere. However, since the side of the pixel definition layer 20 has a certain angle after preparation, various problems will occur when the ink forms the light-emitting layer 30 in the sub-pixel area. Specifically, since the material of the pixel definition layer and the ink have a certain hydrophilicity, the ink will dry at different speeds at the edge and the middle during the drying process, and the edge will form a slope, resulting in the phenomenon that the edge is too thick and the middle is too thin, such as Figure 1 If you want to control this phenomenon, you need to let the ink drop as much as possible in the groove of the pixel definition layer, but this will result in too few ink drops to fill the groove, resulting in the phenomenon of too thick in the middle and too thin at the edge, as shown in Figure 1. Figure 1 As shown in B in the figure. Whether the structure is thick at the edge and thin in the middle or thick in the middle and thin at the edge, it will eventually affect the luminous efficiency of the OLED display device.

[0004] Therefore, the existing OLED display panels have a technical problem that it is difficult to ensure the uniformity of the thickness of the light-emitting layer, which needs to be improved. Summary of the invention

[0005] The embodiments of the present application provide an OLED display panel and a display device, which are used to alleviate the technical problem that it is difficult to ensure the uniformity of the thickness of the light-emitting layer in the existing OLED display panel.

[0006] The embodiment of the present application provides an OLED display panel, comprising:

[0007] substrate;

[0008] A plurality of pixel definition layers are formed on the substrate, and sub-pixel regions are formed between adjacent pixel definition layers;

[0009] A light-emitting layer is formed on the substrate and filled in the sub-pixel area;

[0010] The plurality of pixel definition layers include at least one target pixel definition layer, and a side surface of the target pixel definition layer forms a step structure.

[0011] In one embodiment, the target pixel definition layer is made of an inorganic material.

[0012] In one embodiment, the target pixel definition layer includes at least two pixel definition sub-layers stacked together, and a material of at least one pixel definition sub-layer in the target pixel definition layer is an inorganic material.

[0013] In one embodiment, in a direction away from the substrate, the target pixel definition portion includes a first pixel definition sublayer and a second pixel definition sublayer in sequence, the first pixel definition sublayer material is an inorganic material, and the second pixel definition sublayer material is an organic material.

[0014] In one embodiment, the side surface and the bottom surface of the first pixel definition sublayer form a first angle, and the side surface and the bottom surface of the second pixel definition sublayer form a second angle, and the second angle is greater than or equal to the first angle.

[0015] In one embodiment, the target pixel definition portion further includes a third pixel definition sublayer disposed on a side of the second pixel definition sublayer away from the first pixel definition sublayer, and a material of the third pixel definition sublayer is an organic material.

[0016] In one embodiment, the side surface and the bottom surface of the third pixel definition sublayer form a third angle, and the third angle is greater than or equal to the second angle.

[0017] In one embodiment, the angle formed by the side surface and the bottom surface of each pixel definition sublayer ranges from 25 degrees to 60 degrees.

[0018] In one embodiment, there are multiple target pixel definition layers, and adjacent target pixel definition layers have the same structure.

[0019] The present application also provides a display device, comprising any one of the above-mentioned OLED display panels.

[0020] Beneficial effects: The present application provides an OLED display panel and a display device, wherein the OLED display panel includes a substrate, a plurality of pixel definition layers and a light-emitting layer, wherein the plurality of pixel definition layers are formed on the substrate, a sub-pixel region is formed between adjacent pixel definition layers, and the light-emitting layer is formed on the substrate and filled in the sub-pixel region, wherein the plurality of pixel definition layers include at least one target pixel definition layer, and the side of the target pixel definition layer forms a step structure. In the OLED display panel of the present application, since there is a target pixel definition layer with a step structure on the side, when the light-emitting layer is filled in the sub-pixel region between the target pixel definition layer and the adjacent pixel definition layer, the ink climbing phenomenon will be reduced, and the ink at the edge will be more concentrated in the middle of the sub-pixel region, thereby improving the uniformity of the film thickness of the light-emitting layer and ensuring the light-emitting efficiency of the OLED display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technical solution and beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the inkjet printing result of the light-emitting layer in the OLED display panel in the prior art.

[0023] Figure 2 A schematic diagram of a first film layer structure of an OLED display panel provided in an embodiment of the present application.

[0024] Figure 3 This is a schematic diagram of the second film layer structure of the OLED display panel provided in an embodiment of the present application.

[0025] Figure 4 This is a schematic diagram of a third film layer structure of an OLED display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0031] The embodiments of the present application provide an OLED display panel and a display device, which are used to alleviate the technical problem that it is difficult to ensure the uniformity of the thickness of the light-emitting layer in the existing OLED display panel.

[0032] like Figure 2 As shown, an embodiment of the present application provides an OLED display panel, which includes a substrate 10, a plurality of pixel definition layers 20 and a light-emitting layer 30, wherein the plurality of pixel definition layers 20 are formed on the substrate 10, and a sub-pixel area is formed between adjacent pixel definition layers 20, and the light-emitting layer 30 is formed on the substrate 10 and filled in the sub-pixel area, wherein the plurality of pixel definition layers 20 include at least one target pixel definition layer, and a side surface of the target pixel definition layer forms a stepped structure.

[0033] The substrate 10 includes, from bottom to top, a substrate, a driving circuit layer and a bottom electrode layer.

[0034] The substrate may be a rigid substrate such as glass, transparent resin, etc., or a flexible substrate such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate, or glass fiber reinforced plastic, etc.

[0035] The driving circuit layer is formed on one side of the substrate, including multiple thin film transistors, and the multiple thin film transistors form multiple pixel driving circuits, each pixel driving circuit drives a sub-pixel to emit light. Taking the top gate thin film transistor as an example, the driving circuit layer includes a buffer layer, an active layer, a gate insulating layer, a gate layer, an interlayer dielectric layer, a source and drain layer, a passivation layer and a planarization layer stacked on the substrate. The material of the active layer is a metal oxide, such as indium gallium zinc oxide (IGZO), but not limited to this, it can also be aluminum zinc oxide (AZO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), etc. In addition, the active layer can also be polysilicon material or other materials. The material of the gate insulating layer and the interlayer dielectric layer can be inorganic materials such as silicon oxide and silicon nitride. The material of the gate layer is usually molybdenum, aluminum, copper, but not limited to this, it can also be chromium, tungsten, titanium, tantalum and alloys containing them. The gate layer is patterned to form the gate and scan line of the thin film transistor. The source and drain electrode layers are patterned to form the source, drain and data line of the thin film transistor. The source and drain are connected to the active layer. The material of the passivation layer can be at least one of silicon oxide and silicon nitride. The material of the planarization layer can be photoresist. The description of the structure of each film layer in the above-mentioned driving circuit layer takes the top-gate thin film transistor as an example. Of course, the structure of the driving circuit layer is not limited to this, and can also include a bottom-gate thin film transistor.

[0036] The bottom electrode layer is formed on the driving circuit layer, and is patterned to form a plurality of bottom electrodes arranged in an array and independent of each other. The bottom electrode is connected to the source or drain of the thin film transistor through a via hole, and an opening area is formed between adjacent bottom electrodes. When the OLED display panel is a top light-emitting structure, the bottom electrode is an anode, and when the OLED display panel is a bottom light-emitting structure, the bottom electrode is a cathode. The bottom electrode is generally a non-transparent material with high reflectivity, such as a single Ag layer or a laminated structure of ITO / Ag / ITO.

[0037] A plurality of pixel definition layers 20 are formed on the substrate 10, and a sub-pixel region is formed between adjacent pixel definition layers 20. Specifically, each pixel definition layer 20 is formed in an opening region between adjacent bottom electrodes, each pixel definition layer 20 is independent of each other, and the bottom electrode is located in the sub-pixel region. The light-emitting layer 30 is filled in the sub-pixel region by inkjet printing. In the direction away from the substrate 10, the light-emitting layer 30 sequentially includes a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer that are stacked. A whole top electrode layer (not shown) is also provided on the light-emitting layer 30 and the pixel definition layer 20. When the OLED display panel is a top light-emitting structure, the top electrode is a cathode. When the OLED display panel is a bottom light-emitting structure, the top electrode is an anode. The top electrode is usually made of a transparent metal oxide material, such as indium tin oxide (ITO). An encapsulation layer (not shown) is also provided on the top electrode. The encapsulation layer is usually a laminated structure of an inorganic encapsulation layer-an organic encapsulation layer-an inorganic encapsulation layer, which is used to isolate water and oxygen and protect the film layer below it.

[0038] Among the multiple pixel definition layers 20, at least one pixel definition layer 20 is a target pixel definition layer, and the side of the target pixel definition layer forms a stepped structure. For the convenience of description, the embodiments of the present application are explained as an example in which all pixel definition layers 20 in the OLED display panel are target pixel definition layers, but the present application is not limited to this. The number and setting positions of the target pixel definition layers can be set as needed.

[0039] Since the side of the target pixel definition layer is a stepped structure, when the light-emitting layer 30 is filled in the sub-pixel area between the target pixel definition layer and other adjacent pixel definition layers 20 by inkjet printing, the ink droplets will have greater resistance upward along the side during the drying process, and the climbing phenomenon will be reduced. The ink at the edge will be more concentrated in the middle position of the sub-pixel area, so that the film thickness of the light-emitting layer 30 after drying will be more uniform, thereby ensuring the luminous efficiency of the OLED display panel.

[0040] In one embodiment, the target pixel definition layer material is an inorganic material, which may be silicon oxide or silicon nitride. Since inorganic materials can improve the hydrophobicity between the ink and reduce the affinity between the ink, setting the target pixel definition layer to an inorganic material can make it more difficult for the ink to climb upward along the side, thereby further improving the uniformity of the thickness of the light-emitting layer.

[0041] In one embodiment, the target pixel definition layer includes at least two pixel definition sub-layers stacked in layers, and at least one pixel definition sub-layer in the target pixel definition layer is made of an inorganic material. Figure 3 and Figure 4As shown, the target pixel definition layer is a structure in which two or more pixel definition sublayers are stacked, and the bottom surface of each pixel definition sublayer decreases in the direction away from the substrate 10, so that the side of the target pixel definition layer forms a step structure. In each pixel definition sublayer, at least one pixel definition sublayer is an inorganic material, so when the inkjet-printed ink contacts the pixel definition sublayer, it is not easy to climb up along the side, thereby improving the uniformity of the film thickness of the light-emitting layer.

[0042] In one embodiment, if Figure 3 As shown, in the direction away from the substrate 10, the target pixel definition part includes a first pixel definition sublayer 21 and a second pixel definition sublayer 22 in sequence. The material of the first pixel definition sublayer 21 is an inorganic material, and the material of the second pixel definition sublayer 22 is an organic material. The inorganic material can be silicon oxide or silicon nitride. A layer of inorganic material is uniformly prepared on the substrate 10 by a chemical vapor deposition process, and then a coating, exposure, and development process are used to obtain the first pixel definition sublayer 21, with a thickness of 0.2 to 0.5 microns. The organic material can be an organic polymer compound, specifically including PI (polyimide), PEDOT (polythiophene ethylene polymer), etc. The second pixel definition sublayer 22 is prepared on the first pixel definition sublayer 21 by a yellow light process or direct printing or spraying, with a thickness of 0.2 to 1 micron. The first pixel definition sublayer 21 is located below the second pixel definition sublayer 22, and its contact area with the ink of inkjet printing is the largest, so the hydrophobicity between it and the ink can be maximized to suppress the climbing phenomenon. In addition, since inorganic materials can isolate water and oxygen, setting the first pixel definition sublayer 21 as an inorganic material can effectively prevent the penetration of water and oxygen, and prevent water vapor from entering the interior of the OLED to cause damage. The second pixel definition sublayer 22 is an organic material, which can improve the flexibility of the OLED display panel and effectively improve the bending performance. In addition, since the first pixel definition sublayer 21 is an inorganic material and has a large stress, the second pixel definition sublayer 22 can reduce the stress caused by the first pixel definition sublayer 21.

[0043] In one embodiment, if Figure 3 As shown, the side surface of the first pixel definition sublayer 21 forms a first angle a1 with the bottom surface, and the side surface of the second pixel definition sublayer 22 forms a second angle a2 with the bottom surface, and the second angle a2 is greater than or equal to the first angle a1. Since the second angle a2 is greater than or equal to the first angle a1, the side surface of the second pixel definition sublayer 22 is more inclined relative to the side surface of the first pixel definition sublayer 21, and the upward resistance of the ink along the side surface of the second pixel definition sublayer 22 will be greater, and the climbing phenomenon will be further reduced, so that the film thickness of the light-emitting layer 30 after drying will be more uniform.

[0044] In one embodiment, if Figure 4As shown, the target pixel definition part also includes a third pixel definition sublayer 23 arranged on the side of the second pixel definition sublayer 22 away from the first pixel definition sublayer 21, and the material of the third pixel definition sublayer 23 is an organic material. The third pixel definition sublayer 23 is the same material as the pixel definition layer in the current OLED display panel, which is an organic photoresist. In the direction away from the substrate 10, the bottom surfaces of the first pixel definition sublayer 21, the second pixel definition sublayer 22 to the third pixel definition sublayer 23 are successively reduced, so that the side of the target pixel definition layer forms a stepped structure. When three pixel definition sublayers are set, the first pixel definition sublayer 21 is an inorganic material, and the hydrophobicity between it and the ink can be used to suppress the climbing phenomenon. At the same time, it can play a role in isolating water and oxygen, which can effectively avoid the penetration of water and oxygen, and prevent water vapor from entering the interior of the OLED to cause damage. The second pixel definition sublayer 22 is an organic material, specifically an organic polymer material, which can improve the flexibility of the OLED display panel and effectively improve the bending performance. The organic polymer material can increase the connection of molecular segments. It is arranged between the first pixel definition sublayer 21 and the third pixel definition sublayer 23 to effectively improve the adhesion between the two, so that the two will not peeling (film layer shedding) phenomenon; the third pixel definition sublayer 23 increases the number of steps, further increasing the climbing resistance of the ink, and because the second pixel definition sublayer 22 and the second pixel definition sublayer 23 are both organic materials, the stress difference between different film layers formed by the same material is smaller than the stress difference between different film layers formed by different materials. Therefore, the overall stress can be reduced while ensuring the number of steps.

[0045] In one embodiment, if Figure 4 As shown, the side surface and the bottom surface of the third pixel definition sublayer 23 form a third angle a3, and the third angle a3 is greater than or equal to the second angle a2. Since the third angle a3 is greater than or equal to the second angle a2, and the second angle a2 is greater than or equal to the first angle a1, the inclination of the side surface of the first pixel definition sublayer 21, the side surface of the second pixel definition sublayer 22, and the side surface of the third pixel definition sublayer 23 increases successively, and the upward resistance of the ink along the side surfaces of the three pixel definition sublayers will also gradually increase, and the more it climbs up the slope, the more difficult it will be, thereby further improving the uniformity of the film thickness of the light-emitting layer 30 after drying.

[0046] In one embodiment, the angle formed by the side surface and the bottom surface of each pixel definition sublayer ranges from 25 degrees to 60 degrees. Figure 3 and Figure 4In the figure, the angle formed by the side and bottom of each pixel definition sublayer increases from bottom to top, but each angle is between 25 and 60 degrees. When the angle is too small, the side of the target pixel definition layer will be tilted to a large extent, and the overall height of the target pixel definition layer will be difficult to meet the printing thickness requirements of the light-emitting layer 30. When the angle is too large, the side of the target pixel definition layer will be tilted to a small extent, and it will be difficult to play the role of reducing the ink climbing phenomenon. When the angle is between 25 and 60 degrees, the height of the target pixel definition layer can meet the thickness requirements of the light-emitting layer 30, and the blocking effect on the ink climbing phenomenon can be guaranteed.

[0047] In one embodiment, the number of target pixel definition layers is multiple, and the structures of adjacent target pixel definition layers are the same. When there are multiple target pixel definition layers in the OLED display panel, the structures of any two adjacent target pixel definition layers are the same, that is, the number and type of pixel definition sublayers included in the two are the same, and the angle formed by the side and bottom of each pixel definition sublayer is also equal. This setting makes the structures of the two more symmetrical, and the effect of suppressing ink climbing is also equivalent. When the ink is filled into the sub-pixel area between the two by inkjet printing, it is easier to obtain a light-emitting layer 30 with uniform film thickness. When all pixel definition layers in the OLED display panel are target pixel definition layers, and the structures of all target pixel definition layers are equal, the effect of reducing the ink climbing phenomenon and improving the uniformity of film thickness is best.

[0048] The above embodiment is described by taking the target pixel definition layer including two pixel definition sublayers and three pixel definition sublayers as an example, but the present application is not limited thereto, and may also include more pixel definition sublayers, and the total number of pixel definition sublayers, the material of each pixel definition sublayer, the angle between the side and the bottom of each pixel definition sublayer, etc., may be selectively set according to actual conditions to form a multi-level stepped structure. In addition, it should be noted that when the target pixel definition layer is an integral structure, that is, does not include a pixel definition sublayer, in addition to setting the side of the target pixel definition layer as a stepped structure, the side of the target pixel definition layer may also be etched to form various uneven structures such as sawtooth and wavy shapes, and the difficulty of ink climbing may also be increased, so that the ink at the edge is more concentrated in the middle of the sub-pixel area, thereby improving the uniformity of the film thickness of the light-emitting layer and ensuring the luminous efficiency of the OLED display panel.

[0049] The present application also provides a display device, which can be a device with display function such as a smart watch, a tablet computer, a laptop computer, a personal computer (PC), a micro-processing box, etc. The display device includes an OLED display panel and a driver chip, the driver chip is used to provide a driving signal to the OLED display panel to make it emit light and display, and the OLED display panel is the OLED display panel described in any of the above embodiments. The display device of the present application achieves uniformity of the film thickness of the light-emitting layer by setting a target pixel definition layer with a stepped structure on the side in the OLED display panel, thereby ensuring the luminous efficiency of the display device.

[0050] According to the above embodiments, it can be seen that:

[0051] The present application provides an OLED display panel and a display device, wherein the OLED display panel includes a substrate, a plurality of pixel definition layers and a light-emitting layer, wherein the plurality of pixel definition layers are formed on the substrate, a sub-pixel region is formed between adjacent pixel definition layers, and the light-emitting layer is formed on the substrate and filled in the sub-pixel region, wherein the plurality of pixel definition layers include at least one target pixel definition layer, and the side of the target pixel definition layer forms a step structure. In the OLED display panel of the present application, since there is a target pixel definition layer with a step structure on the side, when the light-emitting layer is filled in the sub-pixel region between the target pixel definition layer and the adjacent pixel definition layer, the ink climbing phenomenon will be reduced, and the ink at the edge will be more concentrated in the middle of the sub-pixel region, thereby improving the uniformity of the film thickness of the light-emitting layer and ensuring the light-emitting efficiency of the OLED display panel.

[0052] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0053] The above is a detailed introduction to an OLED display panel and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An OLED display panel, characterized in that: include: substrate; A plurality of pixel definition layers are formed on the substrate, and sub-pixel regions are formed between adjacent pixel definition layers; A light-emitting layer is formed on the substrate and filled in the sub-pixel area; Wherein, the plurality of pixel definition layers include at least one target pixel definition layer, and the side surface of the target pixel definition layer forms a step structure; In a direction away from the substrate, the target pixel definition layer includes at least a first pixel definition sublayer, a second pixel definition sublayer and a third pixel definition sublayer in sequence, the first pixel definition sublayer is located below the second pixel definition sublayer, and the second pixel definition sublayer is located below the third pixel definition sublayer; The bottom surfaces of the first pixel definition sublayer, the second pixel definition sublayer, and the third pixel definition sublayer decrease in sequence, and the step structure is formed between the second pixel definition sublayer and the third pixel definition sublayer; The side surface and the bottom surface of the first pixel definition sublayer form a first angle, the side surface and the bottom surface of the second pixel definition sublayer form a second angle, and the side surface and the bottom surface of the third pixel definition sublayer form a third angle; The third angle is greater than or equal to the second angle.

2. The OLED display panel according to claim 1, wherein: The target pixel definition layer is made of inorganic material.

3. The OLED display panel according to claim 1, wherein: At least one pixel definition sublayer in the target pixel definition layer is made of an inorganic material.

4. The OLED display panel according to claim 3, wherein: The material of the first pixel definition sublayer is an inorganic material, and the material of the second pixel definition sublayer is an organic material.

5. The OLED display panel according to claim 4, characterized in that: The second angle is greater than or equal to the first angle.

6. The OLED display panel according to claim 5, characterized in that: The material of the third pixel definition sublayer is an organic material.

7. The OLED display panel according to claim 1 or 6, characterized in that: The angle formed by the side surface and the bottom surface of each pixel definition sublayer ranges from 25 degrees to 60 degrees.

8. The OLED display panel according to claim 1, wherein: There are multiple target pixel definition layers, and adjacent target pixel definition layers have the same structure.

9. A display device, characterized in that: An OLED display panel comprising any one of claims 1 to 8.

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