A display panel, a preparation method thereof, and a display device

Abstract

The present disclosure provides a display panel, a manufacturing method thereof, and a display device, relating to the technical field of displays. Among them, the display panel includes: a substrate including an anode layer; a pixel defining layer having a pixel opening formed thereon, a part of the anode layer being exposed through the pixel opening, the pixel defining layer covering an edge portion of the anode layer, the pixel defining layer including a first slope surface facing the pixel opening, and the slope angle of the first slope surface being greater than or equal to 60°; a light-emitting layer disposed on the anode layer exposed through the pixel opening. In the embodiments of the present disclosure, the pixel defining layer includes a first slope surface facing the pixel opening, and the slope angle of the first slope surface is greater than or equal to 60°. Therefore, when the light-emitting layer is formed by an inkjet printing method subsequently, the larger slope angle of the first slope surface of the pixel defining layer can suppress the film climbing phenomenon of the light-emitting layer, reduce the area of the region with uneven film formation of the light-emitting layer, thereby reducing the area of the light-emitting dark region around the pixel structure and increasing the effective light-emitting area of the pixel structure.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and particularly to a display panel, a manufacturing method thereof, and a display device. Background Art

[0002] The methods for preparing the light-emitting layer of a display panel are mainly divided into two categories: vacuum evaporation and solution methods. Compared with the traditional vacuum evaporation method, using the solution method, especially ink-jetting print, to prepare the light-emitting layer can greatly improve the material utilization rate, thus saving costs and facilitating the realization of large-size displays. It is an important direction for the development of future display technologies.

[0003] Currently, the light-emitting layer ink material can be accurately dropped at the corresponding positions of the pixel structures on the substrate where the anode layer and the pixel defining layer have been pre-fabricated, thereby realizing the preparation of the light-emitting layer by ink-jetting print. However, due to the coffee ring effect of the ink droplets, solutes are prone to accumulate at the edge part of the pixel defining layer during the film-forming process, forming a certain degree of film climbing, resulting in a deposition morphology where the light-emitting layer is thick at the edge and thin in the center.

[0004] Figure 1 The thickness schematic diagrams of the hole injection layer in the light-emitting layer of multiple existing display panels are shown. Referring to Figure 1 , the thick edge of the light-emitting layer not only causes loss of material utilization rate, but also when the panel is finally lit, due to uneven film formation at the edge of the light-emitting layer, a significant darkening occurs around the pixel structure, resulting in a small effective light-emitting area of the pixel structure. Moreover, the thicker the light-emitting layer film, the more obvious the climbing phenomenon, and the larger the area of the light-emitting dark region. Summary of the Invention

[0005] The present disclosure provides a display panel, a manufacturing method thereof, and a display device to solve the problem that the light-emitting layer prepared by ink-jetting print in the existing display panel has uneven film formation due to the coffee ring effect, resulting in a small effective light-emitting area of the pixel structure.

[0006] To solve the above problems, the present disclosure discloses a display panel, including:

[0007] A substrate, including a substrate body, the substrate includes a plurality of pixel structure regions, and the pixel structure region includes an anode layer;

[0008] A pixel defining layer, on which pixel openings corresponding to the pixel structure regions are provided, a part of the anode layer is exposed through the pixel openings, the pixel defining layer covers the edge part of the anode layer, the pixel defining layer includes a first slope facing the pixel openings, the slope angle of the first slope is greater than or equal to 60°, the pixel defining layer further includes a second slope away from the pixel openings, and the slope angle of the second slope is less than the slope angle of the first slope;

[0009] A light-emitting layer, wherein the light-emitting layer is disposed on the anode layer exposed from the pixel opening.

[0010] Optionally, the slope angle of the slope surface is less than or equal to 80°.

[0011] Optionally, the slope angle of the first slope surface is greater than or equal to 90°.

[0012] Optionally, the anode layer includes a first portion on a side of the first slope surface away from the pixel opening, and a first dimension of a positive projection of the first portion on the substrate in a direction away from the pixel opening is greater than or equal to 5 μm.

[0013] Optionally, a distance by which a positive projection of the anode layer on the substrate exceeds a positive projection of the slope surface on the substrate is greater than or equal to 5 μm.

[0014] Optionally, a side of the pixel defining layer away from the anode layer is a top surface of the pixel defining layer, and the first dimension is positively correlated with a second dimension of the top surface of the pixel defining layer in a direction from the pixel opening to an adjacent pixel opening.

[0015] Optionally, a side of the pixel defining layer away from the anode layer is a top surface of the pixel defining layer, and a side of the pixel defining layer close to the anode layer is a bottom surface of the pixel defining layer. In a stacking direction of the display panel, a distance between the top surface and the bottom surface of the pixel defining layer is greater than or equal to 1 μm and less than or equal to 1.5 μm.

[0016] Optionally, a side of the pixel defining layer close to the anode layer is a bottom surface of the pixel defining layer, and the pixel defining layer includes a protruding portion facing the pixel opening, and a positive projection of the protruding portion on the substrate is closer to the pixel opening than a positive projection of the bottom surface of the pixel defining layer on the substrate.

[0017] To solve the above problems, the present disclosure also discloses a method for manufacturing a display panel, the method including:

[0018] Providing a substrate including a substrate; the substrate includes a plurality of pixel structure regions, and the pixel structure regions include anode layers;

[0019] Forming a pixel defining initial layer on the substrate and a pixel opening corresponding to the pixel structure region on the pixel defining initial layer through a patterning process; a part of the anode layer is exposed from the pixel opening, the pixel defining initial layer includes a first slope surface facing the pixel opening, and the pixel defining initial layer further includes a second slope surface away from the pixel opening;

[0020] By means of a dry etching process, the pixel definition initial layer is etched such that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than that of the first slope, thereby obtaining a pixel definition layer; the pixel definition layer covers the edge portion of the anode layer;

[0021] By means of an inkjet printing process, a light-emitting layer is formed on the anode layer exposed between the pixel definition layers in the pixel structure region.

[0022] Optionally, the step of etching the pixel definition initial layer by means of a dry etching process such that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than that of the first slope, thereby obtaining a pixel definition layer, includes:

[0023] The pixel definition initial layer is etched by means of a mixed gas of oxygen and tetrafluoromethane such that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than that of the first slope, thereby obtaining a pixel definition layer.

[0024] Optionally, before the step of etching the pixel definition initial layer by means of a dry etching process such that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than that of the first slope, thereby obtaining a pixel definition layer, further included are:

[0025] A post-baking process is performed on the substrate after the pixel definition initial layer is formed;

[0026] The substrate after post-baking is cooled.

[0027] To solve the above problems, the present disclosure also discloses a display device including the above display panel.

[0028] Compared with the prior art, the present disclosure has the following advantages:

[0029] In the embodiments of the present disclosure, the pixel definition layer in the display panel includes a first slope facing the pixel opening, and the slope angle of the first slope is greater than or equal to 60°. Thus, when the light-emitting layer is formed by means of an inkjet printing method subsequently, the larger slope angle of the first slope of the pixel definition layer can suppress the film climbing phenomenon of the light-emitting layer, reduce the area of the region with uneven film formation of the light-emitting layer, thereby reducing the area of the light-emitting dark region around the pixel structure and increasing the effective light-emitting area of the pixel structure. Description of the Drawings

[0030] Figure 1 Schematic diagrams showing the thickness of the hole injection layer in the light-emitting layer of multiple existing display panels;

[0031] Figure 2Shows a cross-sectional view of a display panel according to an embodiment of the present disclosure;

[0032] Figure 3 Shows a cross-sectional view of another display panel according to an embodiment of the present disclosure;

[0033] Figure 4 Shows a cross-sectional view of yet another display panel according to an embodiment of the present disclosure;

[0034] Figure 5 Shows a cross-sectional view of still another display panel according to an embodiment of the present disclosure;

[0035] Figure 6 Shows a flowchart of steps of a method for manufacturing a display panel according to an embodiment of the present disclosure;

[0036] Figure 7 Shows a cross-sectional comparison diagram of a display panel before and after a dry etching process according to an embodiment of the present disclosure;

[0037] Figure 8 Shows a top view comparison diagram between an existing display panel and a display panel according to an embodiment of the present disclosure. Detailed Description of the Embodiments

[0038] To make the above objects, features, and advantages of the present disclosure more apparent and understandable, the present disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Figure 2 Shows a cross-sectional view of a display panel according to an embodiment of the present disclosure. Referring to Figure 2 , the display panel includes:

[0040] A substrate 10, including a substrate 12. The substrate 10 includes a plurality of pixel structure regions P, and the pixel structure region P includes an anode layer 11;

[0041] A pixel defining layer 20, on which a pixel opening 21 corresponding to the pixel structure region P is provided. The pixel defining layer 20 covers an edge portion of the anode layer 11. The pixel defining layer 20 includes a first slope surface 22 facing the pixel opening 21, and the slope angle α of the first slope surface 22 is greater than or equal to 60°. The pixel defining layer 20 further includes a second slope surface 25 away from the pixel opening 21, and the slope angle γ of the second slope surface 25 is less than the slope angle α of the first slope surface 22;

[0042] A light emitting layer 30, which is disposed on the anode layer 11 exposed from the pixel opening 21 in the pixel structure region P.

[0043] Among them, the pixel structure region P is used to form a pixel structure, which is also a sub-pixel (or sub-pixel). A pixel opening 21 corresponding to the pixel structure region P is provided on the pixel defining layer 20. The edge portion of the anode layer 11 is covered by the pixel defining layer 20, and the other portion of the anode layer 11 is exposed from the pixel opening 21. The light-emitting layer 30 can be disposed on the anode layer 11 exposed from the pixel opening 21.

[0044] In the embodiment of the present disclosure, referring to Figure 3 , the slope surface included in the pixel defining layer 20 between the pixel openings 21 only has a first slope surface 22 facing the pixel opening 21. The slope angle α of the first slope surface 22 is greater than or equal to 60°. The slope angle of the first slope surface of the pixel defining layer 20 is relatively large. Thus, when the light-emitting layer 30 is formed by an inkjet printing method subsequently, the relatively large slope angle of the first slope surface of the pixel defining layer 20 can inhibit the film climbing phenomenon of the light-emitting layer 30, reduce the area of the region where the film formation of the light-emitting layer 30 is uneven, thereby reducing the area of the light-emitting dark region around the pixel structure and increasing the effective light-emitting area of the pixel structure.

[0045] Referring to Figure 3 , there is only one pixel opening 21 on one side of the pixel defining layer 20 located at the edge. Therefore, the pixel defining layer 20 located at the edge includes both a first slope surface 22 facing the pixel opening 21 and a second slope surface 25 away from the pixel opening 21. Among them, no light-emitting layer needs to be provided on one side of the second slope surface 25. Therefore, the slope angle γ of the second slope surface 25 can be smaller than the slope angle α of the first slope surface 22.

[0046] Further optionally, the slope angle α of the first slope surface 22 can be less than or equal to 80°. That is, in some alternative embodiments, the slope angle α of the first slope surface 22 can be greater than or equal to 60° and less than or equal to 80°, and the slope angle α of the first slope surface 22 is an acute angle.

[0047] Further optionally, referring to Figure 4 , the slope angle α of the first slope surface 22 can also be greater than or equal to 90°. That is, in some alternative embodiments, the slope angle α of the first slope surface 22 can be a right angle or an obtuse angle.

[0048] Optionally, referring to Figure 2 , the orthographic projection of the anode layer 11 on the substrate 12 covers the orthographic projection of the slope surface 22 on the substrate 12, thereby realizing the lap joint between the pixel defining layer 20 and the anode layer 11.

[0049] Further optionally, the anode layer 11 includes a first portion 111 on a side of the first slope surface 22 away from the pixel opening 21, and a first dimension d1 of a positive projection of the first portion 111 on the substrate 12 in a direction away from the pixel opening 21 is greater than or equal to 5 μm. It should be clear that the first portion 111 is a portion of the anode layer 11 covered by the pixel defining layer 20 that completely exceeds the first slope surface 22.

[0050] In practical applications, especially in large-sized display panels prepared by an inkjet printing method, a portion of the anode layer 11 that does not expose the pixel opening 21 extends beyond the first slope surface 22 in a direction away from the pixel opening 21, and the extended distance is not less than 5 μm, thereby improving the lap joint reliability between the pixel defining layer 20 and the anode layer 11.

[0051] In some embodiments, the first dimension d1 may specifically be greater than or equal to 5 μm and less than or equal to 10 μm.

[0052] Also optionally, referring to Figure 2 , a surface of the pixel defining layer 20 away from the anode layer 11 is a top surface 23 of the pixel defining layer 20, and the first dimension d1 is positively correlated with a second dimension w1 of the top surface 23 of the pixel defining layer 20 in a direction from the pixel opening 21 to an adjacent pixel opening 21. In the embodiments of the present disclosure, the second dimension w1 may also be referred to as the width of the top surface 23.

[0053] In practical applications, the larger the width w1 of the top surface 23 of the pixel defining layer 20, the larger the first dimension d1 by which the anode layer 11 extends beyond the first slope surface 22, thereby taking into account the consumption of the anode layer material and the lap joint reliability between the pixel defining layer 20 and the anode layer 11.

[0054] Optionally, referring to Figure 2 , a surface of the pixel defining layer 20 away from the anode layer 11 is a top surface 23 of the pixel defining layer 20, and a surface close to the anode layer 11 is a bottom surface 24 of the pixel defining layer 20. In a stacking direction D of the display panel, a distance H1 between the top surface 23 and the bottom surface 24 of the pixel defining layer 20 is greater than or equal to 1 μm and less than or equal to 1.5 μm.

[0055] Among them, the distance H1 between the top surface 23 and the bottom surface 24 of the pixel defining layer 20, that is, the thickness of the pixel defining layer 20, and a thickness of 1 - 1.5 μm of the pixel defining layer 20 can meet the design requirements of most current display panels.

[0056] Also optionally, referring to Figure 5 , the pixel defining layer 20 includes a protruding portion 26 facing the pixel opening 21, and a positive projection of the protruding portion 26 on the substrate 121 is closer to the pixel opening 21 than a positive projection of the bottom surface 24 of the pixel defining layer 20 on the substrate 12.

[0057] Among them, the protrusion 26 causes a depression to exist near the anode layer 11 on the first slope surface 22. Thus, when the light-emitting layer 30 is formed by an inkjet printing method subsequently, the light-emitting layer 30 will enter the depression for filling. In this way, the film climbing phenomenon of the light-emitting layer 30 can be further suppressed.

[0058] In addition, the display panel provided by the embodiments of the present disclosure may further include other conventional structures, and the embodiments of the present disclosure do not make specific limitations thereon.

[0059] In the embodiments of the present disclosure, the pixel defining layer in the display panel includes a first slope surface facing the pixel opening, and the slope angle of the first slope surface is greater than or equal to 60°. Thus, when the light-emitting layer is formed by an inkjet printing method subsequently, the larger slope angle of the first slope surface of the pixel defining layer can suppress the film climbing phenomenon of the light-emitting layer, reduce the area of the region where the light-emitting layer is unevenly formed, thereby reducing the area of the light-emitting dark region around the pixel structure and increasing the effective light-emitting area of the pixel structure.

[0060] Refer to Figure 6 , which shows a step flowchart of a method for manufacturing a display panel according to an embodiment of the present disclosure. The manufacturing method includes the following steps:

[0061] Step 301: Provide a substrate including a substrate; the substrate includes a plurality of pixel structure regions, and the pixel structure regions include anode layers.

[0062] Among them, the substrate further includes structures such as thin-film transistors and capacitors. For details, reference may be made to related technologies, and the embodiments of the present disclosure do not elaborate herein.

[0063] In this step, the substrate can be cleaned for subsequent use.

[0064] Step 302: Through a patterning process, form a pixel defining initial layer on the substrate, and pixel openings corresponding to the pixel structure regions on the pixel defining initial layer; a part of the anode layer is exposed from the pixel openings. The pixel defining initial layer includes a first slope surface facing the pixel openings, and the pixel defining initial layer further includes a second slope surface away from the pixel openings.

[0065] In this step, first, a pixel defining material layer can be coated on the substrate formed with the anode layer. The pixel defining material may specifically be a photoresist material. Then, the substrate coated with the pixel defining material layer is subjected to vacuum drying. After that, the substrate after vacuum drying is subjected to a pre-baking process. Furthermore, through a mask plate, an exposure process is performed on the pixel defining material layer to form the pixel defining initial layer and the pixel openings on the pixel defining initial layer.

[0066] Among them, after the exposure process, a first slope facing the pixel opening and a second slope away from the pixel opening are formed on the pixel definition initial layer. At this time, the slope angles of the first slope and the second slope are the same, about 10°-45°.

[0067] Optionally, after the exposure process, the substrate after forming the pixel definition initial layer can also be subjected to Automated Optical Inspection (AOI), so that the substrate can be defect-detected based on optical distance. After passing the detection, the subsequent steps can be continued.

[0068] Step 303: Etch the pixel definition initial layer through a dry etching process, so that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than that of the first slope, to obtain a pixel definition layer; the pixel definition layer covers the edge part of the anode layer.

[0069] Optionally, before step 303, the following steps are further included:

[0070] Perform a post-baking process on the substrate after forming the pixel definition initial layer;

[0071] Cool the substrate after post-baking.

[0072] After the cooling process, the dry etching process can be performed on the pixel definition initial layer.

[0073] Figure 7 A cross-sectional comparison diagram of the display panel before and after the dry etching process is shown. Among them, (i) is the cross-sectional diagram of the display panel before the dry etching process, and (ii) is the cross-sectional diagram of the display panel after the dry etching process. In Figure 7 In the shown display panel (i) before the dry etching process, the slope angle β of the slope of the pixel definition initial layer 01 is below 45°. No matter how the post-baking process conditions are adjusted, it is always impossible to make the slope angle of the pixel definition initial layer 01 reach more than 45°. Therefore, after the cooling process, the first slope of the pixel definition initial layer 01 can be dry-etched to obtain a pixel definition layer 20 with the slope angle of the first slope greater than or equal to 60°. The second slope can not be dry-etched, so the slope angle of the second slope is still 10°-45°, which is less than the slope angle of the first slope.

[0074] In an optional implementation manner, specifically, a mixed gas of oxygen (O 2 ) and tetrafluoromethane (CF 4 ) can be used to etch the pixel definition initial layer 01, so that the slope angle of the slope is greater than or equal to 60°, and the slope angle of the second slope is less than that of the first slope, to obtain a pixel definition layer 20.

[0075] Since the designed area of the anode layer exceeds the slope angle area of the pixel defining layer 20 by a certain distance, even if a slope angle of more than 60° is achieved through the dry etching process, it will not affect the normal injection of the light-emitting layer film into the edge of the pixel structure, nor will it affect the light emission of the display panel.

[0076] Among them, the morphology of the pixel defining layer of the existing display panel is similar to that of the display panel (1) before the dry etching process shown in Figure 7 . If the light-emitting layer 30 is directly prepared on the display panel (1) before the dry etching process, the film climbing height H3 of the light-emitting layer 30 will be relatively high, resulting in a relatively large area of the light-emitting dark area 02 and a relatively small film-forming uniform area 03, and a relatively small effective light-emitting area of the pixel structure.

[0077] Affected by the etching loss, the thickness of the pixel defining initial layer after dry etching will become thinner. Therefore, referring to Figure 7 , in the embodiments of the present disclosure, the thickness H2 lost during dry etching can be considered in advance in the coating thickness of the pixel defining material layer. Thus, when coating the pixel defining material layer, the coating thickness can be (H1 + H2), so that the final thickness of the pixel defining layer 20 can reach the designed thickness H1.

[0078] In addition, the subsequent dry etching process will not only cause a thickness loss of the pixel defining initial layer, but also cause a width loss of the pixel defining initial layer. Therefore, in the embodiments of the present disclosure, the width lost during dry etching is considered in advance in the coating width of the pixel defining material layer. Thus, when coating the pixel defining material layer, the coating width can be wider than the designed bottom width of the pixel defining initial layer, so that the bottom width of the pixel defining layer 20 can reach the designed width.

[0079] In practical applications, optionally, if a pixel defining layer with a protrusion as shown in Figure 5 is to be obtained, targeted etching can be performed on the first slope of the pixel defining layer near the anode layer before or after the above dry etching process, so as to form a depression near the anode layer on the first slope, so that the pixel defining layer has a protrusion facing the pixel opening. Alternatively, the setting of the depression, protrusion, and first slope can also be achieved by hierarchically setting pixel defining layers with different slope angles.

[0080] Step 304: Form a light-emitting layer on the anode layer exposed between the pixel defining layers in the pixel structure area through an inkjet printing process.

[0081] After forming the pixel defining layer 20 with a slope angle greater than or equal to 60°, the light-emitting material ink can be formed on the anode layer exposed between the pixel defining layers by inkjet printing, so as to form a light-emitting layer.

[0082] It should be noted that the light-emitting layer in the embodiment of the present disclosure can be an OLED (Organic Light Emitting Display) light-emitting device film layer, or a QLED (Quantum Dot light Emitting Diode) light-emitting device film layer. Correspondingly, the display panel provided in the embodiment of the present disclosure can be an OLED display panel or a QLED display panel, and the embodiment of the present disclosure does not specifically limit this.

[0083] Figure 8 A top view comparison diagram of an existing display panel (three) and a display panel (four) according to an embodiment of the present disclosure is shown. Figure 7 and Figure 8 By forming a pixel defining layer 20 with a slope angle greater than or equal to 60° through a dry etching process, the film climbing height of the light-emitting layer can be reduced from H3 to H4, the area of ​​the light-emitting dark area 02 is reduced accordingly, and the uniform film-forming area 03 is increased, thereby increasing the effective light-emitting area of ​​the pixel structure.

[0084] In addition, the method for preparing the display panel provided in the embodiment of the present disclosure may also include other conventional steps, which are not specifically limited in the embodiment of the present disclosure.

[0085] In the embodiment of the present disclosure, the first slope of the pixel defining layer in the display panel can be formed with a slope angle greater than or equal to 60° through a dry etching process, so that when the light-emitting layer is subsequently formed by an inkjet printing method, the larger slope angle of the first slope of the pixel defining layer can suppress the film climbing phenomenon of the light-emitting layer, thereby reducing the area of ​​uneven film formation of the light-emitting layer, thereby reducing the area of ​​the dark luminous area around the pixel structure and increasing the effective light-emitting area of ​​the pixel structure.

[0086] The embodiment of the present disclosure also discloses a display device, including the above-mentioned display panel.

[0087] In the embodiment of the present disclosure, the pixel defining layer in the display panel includes a first slope surface facing the pixel opening, and the slope angle of the first slope surface is greater than or equal to 60°. Therefore, when the light-emitting layer is subsequently formed by inkjet printing, the larger slope angle of the first slope surface of the pixel defining layer can suppress the film climbing phenomenon of the light-emitting layer, so that the area of ​​uneven film formation of the light-emitting layer is reduced, thereby reducing the area of ​​the dark area around the pixel structure and increasing the effective light-emitting area of ​​the pixel structure.

[0088] For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present disclosure is not limited by the described action sequence, because according to the present disclosure, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present disclosure.

[0089] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0090] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the said element.

[0091] The above provides a detailed introduction to a display panel, a method for manufacturing the same, and a display device provided by the present disclosure. Specific examples are used herein to elaborate on the principle and implementation manner of the present disclosure. The description of the above embodiments is only used to help understand the method and its core idea of the present disclosure; at the same time, for those of ordinary skill in the art, according to the idea of the present disclosure, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present disclosure.

Claims

1. A display panel, characterized in that, comprising: a substrate including a base, the substrate including a plurality of pixel structure regions, the pixel structure regions including an anode layer; a pixel defining layer having pixel openings corresponding to the pixel structure regions provided thereon, a part of the anode layer being exposed from the pixel openings, the pixel defining layer covering an edge portion of the anode layer, the pixel defining layer including a first slope facing the pixel openings, the slope angle of the first slope being greater than or equal to 60°, the pixel defining layer further including a second slope away from the pixel openings, the slope angle of the second slope being less than the slope angle of the first slope; a light emitting layer provided on the anode layer exposed from the pixel openings; the slope angle of the first slope is less than or equal to 80°; a pixel defining initial layer, and the pixel openings corresponding to the pixel structure regions on the pixel defining initial layer are prepared by a patterning process; the pixel defining layer is prepared by a dry etching process; both the first slope and the second slope are prepared by the dry etching process; the light emitting layer is prepared by an inkjet printing process.

2. The display panel according to claim 1, characterized in that, the orthographic projection of the anode layer on the substrate covers the orthographic projection of the first slope on the substrate.

3. The display panel according to claim 1, characterized in that, the anode layer includes a first portion on a side of the first slope away from the pixel openings, and a first dimension of the orthographic projection of the first portion on the substrate in a direction away from the pixel openings is greater than or equal to 5 μm.

4. The display panel according to claim 3, characterized in that, a side of the pixel defining layer away from the anode layer is a top surface of the pixel defining layer, and the first dimension is positively correlated with a second dimension of the top surface of the pixel defining layer in a direction from the pixel opening to an adjacent pixel opening.

5. The display panel according to claim 1, characterized in that, a side of the pixel defining layer away from the anode layer is a top surface of the pixel defining layer, and a side close to the anode layer is a bottom surface of the pixel defining layer. In a stacking direction of the display panel, a distance between the top surface and the bottom surface of the pixel defining layer is greater than or equal to 1 μm and less than or equal to 1.5 μm.

6. The display panel according to claim 1, characterized in that, a side of the pixel defining layer close to the anode layer is a bottom surface of the pixel defining layer, the pixel defining layer includes a protruding portion facing the pixel openings, and an orthographic projection of the protruding portion on the substrate is closer to the pixel openings than an orthographic projection of the bottom surface of the pixel defining layer on the substrate.

7. A method for manufacturing a display panel, characterized in that, the method includes: providing a substrate including a base; the substrate includes a plurality of pixel structure regions, the pixel structure regions including an anode layer; Through a patterning process, an initial pixel defining layer is formed on the substrate, and pixel openings corresponding to the pixel structure regions are formed on the initial pixel defining layer; a part of the anode layer exposes the pixel openings, the initial pixel defining layer includes a first slope facing the pixel openings, and the initial pixel defining layer further includes a second slope away from the pixel openings; Through a dry etching process, the initial pixel defining layer is etched so that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than the slope angle of the first slope, obtaining a pixel defining layer; the pixel defining layer covers an edge portion of the anode layer; Through an inkjet printing process, a light-emitting layer is formed on the anode layer exposed between the pixel defining layers in the pixel structure region; The slope angle of the first slope is less than or equal to 80°.

8. The method according to claim 7, wherein, the step of etching the initial pixel defining layer through a dry etching process so that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than the slope angle of the first slope, obtaining a pixel defining layer, includes: etching the initial pixel defining layer through a mixed gas of oxygen and tetrafluoromethane so that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than the slope angle of the first slope, obtaining a pixel defining layer; The slope angle of the first slope is less than or equal to 80°.

9. The method according to claim 7, wherein, before the step of etching the initial pixel defining layer through a dry etching process so that the slope angle of the first slope is greater than or equal to 60°, and the slope angle of the second slope is less than the slope angle of the first slope, obtaining a pixel defining layer, further includes: performing a post-baking process on the substrate after forming the initial pixel defining layer; cooling the substrate after post-baking; The slope angle of the first slope is less than or equal to 80°.

10. A display device, wherein, it includes the display panel according to any one of claims 1-6.

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