Display panel and preparation method thereof

Abstract

The embodiment of the invention discloses a display panel and a preparation method of the display panel. The display panel includes: a substrate; the light-emitting devices are located on one side of the substrate, and each light-emitting device comprises a first electrode, a light-emitting functional layer and a second electrode which are arranged in a stacked mode; the pixel definition layer is arranged between the adjacent first electrodes, the pixel definition layer is provided with a plurality of pixel openings, the pixel openings are located on the sides, away from the substrate, of the first electrodes, and at the side wall positions of the pixel openings, the light-emitting function layers in the pixel openings are disconnected from the light-emitting function layers outside the pixel openings. According to the technical scheme provided by the embodiment of the invention, the pixel definition layer is arranged between the adjacent first electrodes, the plurality of pixel openings are arranged, and the light-emitting functional layer in the pixel openings and the light-emitting functional layer outside the pixel openings are disconnected at the side wall positions of the pixel openings, so that the problem of pixel crosstalk is solved, and the quality and yield stability of a display product are ensured.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a method for preparing the display panel. Background Art

[0002] The pixel pitch of existing micro-OLEDs, such as silicon-based OLEDs, is one-tenth of that of display devices, or even closer. Organic materials are semiconductors and have a certain charge transfer capability, especially hole injection materials.

[0003] Figure 1 Schematic diagram of the structure of a display panel in the related art. Figure 1 As shown, it includes a substrate 10, an anode 108, a limiting layer 107, a hole injection layer 101, a hole transport layer 102, a light emitting layer 103, an electron transport layer 104, an electron injection layer 105 and a cathode 106. Since the pixel pitch of the silicon-based micro display device is particularly small, and the silicon-based micro display evaporation is all evaporation with a common mask, the organic material has good continuity. Therefore, when one of the pixels is lit, due to the conductivity of the hole injection layer 101, part of the current will leak to the adjacent pixels more easily, such as Figure 1 As shown by the arrow in the middle, adjacent pixels are slightly illuminated, which is pixel crosstalk. Pixel crosstalk can lead to poor color purity and even color unevenness, affecting the quality of display products. Summary of the invention

[0004] The present invention provides a display panel and a method for preparing the display panel, so as to improve the problem of pixel crosstalk and ensure the quality and yield stability of display products.

[0005] According to one aspect of the present invention, there is provided a display panel, the display panel comprising:

[0006] substrate;

[0007] A plurality of light-emitting devices, wherein the light-emitting devices are located on one side of the substrate, and the light-emitting devices include a first electrode, a light-emitting functional layer, and a second electrode which are stacked;

[0008] The pixel definition layer is arranged between adjacent first electrodes, and the pixel definition layer is provided with a plurality of pixel openings. The pixel openings are located on a side of the first electrode away from the substrate, and at the side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected.

[0009] Optionally, an angle between a side wall of the pixel opening and a surface of the first electrode away from the substrate is less than or equal to 90 degrees.

[0010] Optionally, the thickness of the pixel definition layer is greater than or equal to 10 nm and less than or equal to 20 nm.

[0011] Optionally, the pixel definition layer includes a partition portion, a covering portion and a continuous portion; the partition portion is at least partially located on a side of the first electrode away from the substrate, and the continuous portion is located between adjacent first electrodes; the covering portion connects the partition portion and the continuous portion;

[0012] The thickness of the continuous portion is smaller than the thickness of the first electrode, and a surface of the continuous portion close to the substrate is flush with a surface of the first electrode close to the substrate.

[0013] Optionally, in a cross section along the thickness direction of the display panel, the first electrode is in a right trapezoidal shape.

[0014] Optionally, an angle between the covering portion and the substrate is less than or equal to 50°.

[0015] Optionally, the thickness of the light-emitting functional layer is smaller than the thickness of the pixel definition layer.

[0016] Optionally, the thickness of the second electrode is greater than or equal to the thickness of the pixel definition layer.

[0017] According to another aspect of the present invention, a method for preparing a display panel is provided, and the method for preparing a display panel includes:

[0018] providing a substrate;

[0019] forming a first electrode on one side of the substrate;

[0020] A pixel definition layer is formed on a side of the first electrode away from the substrate, wherein the pixel definition layer is provided with a plurality of pixel openings;

[0021] A light-emitting functional layer is formed on a side of the pixel definition layer away from the substrate; wherein, at a side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected;

[0022] A second electrode is formed on a side of the light emitting functional layer away from the substrate.

[0023] Optionally, forming a first electrode on one side of the substrate includes:

[0024] forming a first electrode material in a full layer on one side of the substrate;

[0025] Patterning the first electrode material to form a plurality of regular trapezoidal first electrodes;

[0026] A pixel definition layer is formed on a side of the first electrode away from the substrate, comprising:

[0027] forming a whole layer of pixel definition layer material on a side of the first electrode away from the substrate;

[0028] The pixel definition layer material is patterned to form a pixel definition layer including a partition portion, a covering portion and a continuous portion; wherein the partition portion is at least partially located on a side of the first electrode away from the substrate, and the continuous portion is located between adjacent first electrodes; the covering portion connects the partition portion and the continuous portion; and the angle between the side wall of the partition portion and the surface of the first electrode away from the substrate is less than or equal to 90 degrees.

[0029] The technical solution of an embodiment of the present invention provides a display panel, including a substrate, a plurality of light-emitting devices and a pixel definition layer, the light-emitting device including a first electrode, a light-emitting functional layer and a second electrode which are stacked, the pixel definition layer being arranged between adjacent first electrodes and having a plurality of pixel openings, at the side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected, thereby disconnecting the light-emitting functional layers of adjacent light-emitting devices, preventing current from flowing, reducing the risk of crosstalk between pixels, and improving product quality.

[0030] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a structural schematic diagram of a display panel in the related art;

[0033] Figure 2 is a schematic structural diagram of a display panel provided according to an embodiment of the present invention;

[0034] Figure 3 is a schematic structural diagram of a part of film layers in a display panel provided according to an embodiment of the present invention;

[0035] Figure 4 is a schematic structural diagram of a portion of film layers in another display panel provided according to an embodiment of the present invention;

[0036] Figure 5 is a schematic structural diagram of a pixel definition layer provided according to an embodiment of the present invention;

[0037] Figure 6 is a flow chart of a method for preparing a display panel provided according to an embodiment of the present invention;

[0038] Figure 7 is a flow chart of another method for preparing a display panel provided according to an embodiment of the present invention;

[0039] Figure 8-Figure 16 It is a cross-sectional view corresponding to each step of another method for preparing a display panel provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Figure 2 is a schematic diagram of the structure of a display panel provided according to an embodiment of the present invention. Figure 2 As shown, the display panel includes: a substrate 10; a plurality of light-emitting devices 20, the light-emitting devices 20 are located on one side of the substrate 10, and the light-emitting devices 20 include a first electrode 201, a light-emitting functional layer 202 and a second electrode 203 which are stacked; a pixel definition layer 30, the pixel definition layer 30 is arranged between adjacent first electrodes 201, and the pixel definition layer 30 is provided with a plurality of pixel openings 300, the pixel openings 300 are located on a side of the first electrode 201 away from the substrate 10, and at the side wall position of the pixel opening 300, the light-emitting functional layer 202 in the pixel opening 300 and the light-emitting functional layer 202 outside the pixel opening 300 are disconnected.

[0043] In an embodiment of the present invention, the material of the substrate 10 may be a silicon-based material, that is, the display panel in the embodiment of the present invention may be a silicon-based organic light emitting diode (OLED) display panel. Silicon-based materials are new materials developed based on silicon materials, including silicon materials on insulating layers, germanium silicon materials, porous silicon, microcrystalline silicon, and other compound semiconductor materials heteroepitaxially grown on silicon substrates. A plurality of light-emitting devices 20 are arranged on one side of the substrate 10. The light-emitting device 20 may include an organic light-emitting device, such as an OLED; it may also include an inorganic light-emitting device, such as a micro-light-emitting diode Micro-LED. The light-emitting device 20 includes a first electrode 201, a light-emitting functional layer 202, and a second electrode 203 stacked in sequence. Exemplarily, in an OLED display panel, the first electrode 201 of the light-emitting device 20 is an anode, and the second electrode 203 is a cathode. The light-emitting functional layer 202 includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer stacked in layers. Optionally, the display panel may include light emitting devices 20 of different colors. For example, the display panel may include a red light emitting device, a green light emitting device, and a blue light emitting device.

[0044] The display panel also includes a pixel definition layer 30. The pixel definition layer 30 needs to be opened in the pixel area to form a pixel opening 300. Exemplarily, the pixel definition layer 30 can be patterned by a photolithography process to form the pixel opening 300. At the side wall position of the pixel opening 300, the light-emitting function layer 202 in the pixel opening 300 and the light-emitting function layer 202 outside the pixel opening 300 are disconnected, thereby disconnecting the light-emitting function layer 202 of the adjacent light-emitting device 20, and no current will flow, thereby reducing the risk of crosstalk between pixels and improving product quality.

[0045] The technical solution of an embodiment of the present invention provides a display panel, including a substrate, a plurality of light-emitting devices and a pixel definition layer, the light-emitting device including a first electrode, a light-emitting functional layer and a second electrode which are stacked, the pixel definition layer being arranged between adjacent first electrodes and having a plurality of pixel openings, at the side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected, thereby disconnecting the light-emitting functional layers of adjacent light-emitting devices, preventing current from flowing, reducing the risk of crosstalk between pixels, and improving product quality.

[0046] Figure 3 is a schematic diagram of the structure of a portion of a film layer in a display panel provided according to an embodiment of the present invention. Figure 2 and Figure 3 Optionally, an angle α between a side wall of the pixel opening 300 and a surface of the first electrode 201 away from the substrate 10 is less than or equal to 90 degrees.

[0047] In the embodiment of the present invention, Figure 2 As shown, the angle α between the side wall of the pixel opening 300 and the surface of the first electrode 201 away from the substrate 10 is equal to 90 degrees, so that when the light-emitting functional layer 202 is formed on the side of the pixel definition layer 30 away from the substrate 10, the light-emitting functional layer 202 in the pixel opening 300 and the light-emitting functional layer 202 outside the pixel opening 300 are disconnected, thereby disconnecting the light-emitting functional layer 202 of the adjacent light-emitting device 20, and no current will flow, thereby reducing the risk of crosstalk between pixels and improving product quality.

[0048] In other optional embodiments of the present invention, Figure 3 As shown, the angle α between the side wall of the pixel opening 300 and the surface of the first electrode 201 away from the substrate 10 is less than 90 degrees.

[0049] Figure 4 FIG. 1 is a schematic diagram of the structure of a portion of a film layer in another display panel provided according to an embodiment of the present invention. In other optional embodiments of the present invention, for example Figure 4 As shown, the angle α between the sidewall of the pixel opening 300 and the surface of the first electrode 201 away from the substrate 10 can also be greater than 90 degrees. Exemplarily, the angle α between the sidewall of the pixel opening 300 and the surface of the first electrode 201 away from the substrate 10 can be greater than 90 degrees and less than or equal to 110 degrees.

[0050] Based on the technical solution of the above invention embodiment, Figure 2 Optionally, the thickness of the pixel definition layer 30 is greater than or equal to 10 nm and less than or equal to 20 nm.

[0051] In the embodiment of the present invention, the material of the pixel definition layer 30 includes but is not limited to silicon oxide (SiO), and the thickness of the pixel definition layer 30 is controlled between 10nm and 20nm. In other optional embodiments of the present invention, the thickness of the light-emitting functional layer 202 is less than the thickness of the pixel definition layer 30. Exemplarily, the thickness of the light-emitting functional layer 202 is set to be less than 10nm, which facilitates the disconnection of the light-emitting functional layer 202 in the pixel opening 300 and the light-emitting functional layer 202 outside the pixel opening 300, thereby disconnecting the light-emitting functional layer 202 of the adjacent light-emitting device 20, and no current will flow, thereby reducing the risk of pixel crosstalk.

[0052] Figure 5 is a schematic diagram of the structure of a pixel definition layer provided according to an embodiment of the present invention. Figure 2 and Figure 5As shown, the pixel definition layer 30 includes a partition portion 301, a covering portion 302 and a continuous portion 303; the partition portion 301 is at least partially located on the side of the first electrode 201 away from the substrate 10, and the continuous portion 303 is located between adjacent first electrodes 201; the covering portion 302 connects the partition portion 301 and the continuous portion 303; the thickness of the continuous portion 303 is less than the thickness of the first electrode 201, and the surface of the continuous portion 303 close to the substrate 10 is flush with the surface of the first electrode 201 close to the substrate 10.

[0053] In the embodiment of the present invention, reference Figure 2 and Figure 5 The pixel definition layer 30 includes three parts, namely, a partition part 301, a covering part 302 and a continuous part 303. A pixel opening 300 is provided between two adjacent partition parts 301. The covering part 302 is connected between the partition part 301 and the continuous part 303. The continuous part 303 is located between two adjacent first electrodes 201. The thickness of the continuous part 303 is less than the thickness of the first electrode 201, and the surface of the continuous part 303 close to the substrate 10 is flush with the surface of the first electrode 201 close to the substrate 10, so as to form a small angle between the covering part 302 and the substrate 10.

[0054] Based on the technical solution of the above invention embodiment, Figure 2 Optionally, in a cross section along the thickness direction of the display panel, the first electrode 201 is in a right trapezoidal shape.

[0055] In an embodiment of the present invention, in a cross section along the thickness direction X of the display panel, the first electrode 201 is set to be a right trapezoid, so that when the pixel definition layer 30 is formed on one side of the first electrode 201, a smaller angle is formed between the covering portion 302 in the pixel definition layer 30 and the substrate 10, thereby preventing the pixel definition layer 30 from breaking itself.

[0056] Based on the technical solution of the above invention embodiment, Figure 2 Optionally, the angle between the covering portion 302 and the substrate 10 is less than or equal to 50°.

[0057] In the embodiment of the present invention, the angle θ between the covering portion 302 and the substrate 10 is less than or equal to 50°, thereby preventing the pixel definition layer 30 from breaking and improving product quality.

[0058] Based on the technical solution of the above invention embodiment, Figure 2 Optionally, the thickness of the second electrode 203 is greater than or equal to the thickness of the pixel definition layer 30 .

[0059] In an embodiment of the present invention, exemplarily, when forming the pixel definition layer 30, the thickness of the pixel definition layer 30 is controlled between 10nm and 20nm, and when forming the second electrode 203, for example, when forming the cathode, the thickness of the cathode is set to 20nm or thicker. Although the cathode has a fault, since the thickness of the cathode is greater than or equal to the thickness of the pixel definition layer 30, part of the cathode material will eventually be connected to each other and not completely disconnected, thereby achieving the continuity of the cathode and avoiding cathode breakage.

[0060] Figure 6 1 is a flow chart of a method for manufacturing a display panel according to an embodiment of the present invention. The embodiment of the present invention can be applied to manufacturing a display panel. The method for manufacturing a display panel can be performed by a display panel manufacturing device. The display panel manufacturing device can be implemented in the form of hardware and / or software. Figure 6 As shown, the method includes:

[0061] S110, providing a substrate.

[0062] Specifically, the substrate may be a silicon-based complementary metal oxide semiconductor (CMOS).

[0063] S120, forming a first electrode on one side of the substrate.

[0064] For example, metal materials such as titanium (Ti), aluminum (Al) and titanium nitride (TiN) are sequentially coated on the silicon-based CMOS, a layer of photoresist is spin-coated on the metal material, and after exposure and development, the photoresist outside the pixel is removed. The upper film layer of the area outside the pixel is etched away by an etching process to form a pixelated pattern, and a first electrode with a smaller angle slope is formed on one side of the substrate by controlling parameters such as the etching gas composition, ratio and power, such as forming a first electrode of a regular trapezoid. After the first electrode is formed, a wet chemical process can be applied to remove all photoresists.

[0065] S130, forming a pixel definition layer on a side of the first electrode away from the substrate, wherein the pixel definition layer is provided with a plurality of pixel openings.

[0066] Specifically, a pixel definition layer is formed by coating a film on the side of the first electrode away from the substrate. Exemplarily, SiO is plated on the side of the first electrode away from the substrate, and the thickness is controlled between 10nm and 20nm to form a pixel definition layer. Then, a pixel opening is formed by processes such as coating photoresist, exposure, development and etching.

[0067] S140, forming a light-emitting functional layer on a side of the pixel definition layer away from the substrate; wherein, at a side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected.

[0068] Specifically, a light-emitting functional layer is formed on a side of the pixel definition layer away from the substrate, and an angle between a side wall of the pixel opening and a surface of the first electrode away from the substrate is less than or equal to 90 degrees. The thickness of the light-emitting functional layer is less than the thickness of the pixel definition layer. At the side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected, thereby disconnecting the light-emitting functional layers of adjacent light-emitting devices, preventing current from flowing, and reducing the risk of crosstalk between pixels.

[0069] S150, forming a second electrode on a side of the light-emitting functional layer away from the substrate.

[0070] Specifically, a second electrode is formed on a side of the light-emitting functional layer away from the substrate, and the thickness of the second electrode is greater than the thickness of the pixel definition layer. Although the second electrode has a fault, some of the second electrode materials will eventually be connected to each other and not completely disconnected, thereby achieving the continuity of the second electrode.

[0071] The technical solution of the embodiment of the present invention forms a display panel, including a substrate, a plurality of light-emitting devices and a pixel definition layer, the light-emitting device includes a first electrode, a light-emitting functional layer and a second electrode which are stacked, a pixel definition layer is formed on a side of the first electrode away from the substrate, and the pixel definition layer is provided with a plurality of pixel openings, at the side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected, thereby disconnecting the light-emitting functional layers of adjacent light-emitting devices, preventing current from flowing, reducing the risk of crosstalk between pixels, and improving product quality.

[0072] Figure 7 1 is a flow chart of another method for manufacturing a display panel according to an embodiment of the present invention. This embodiment is a detailed description of the technical features of the above embodiment. Figure 7 As shown, the method for preparing the display panel includes:

[0073] S210, providing a substrate.

[0074] Specifically, refer to Figure 8 , providing a substrate 10. The substrate 10 may be a silicon-based CMOS.

[0075] S220 , forming a whole layer of first electrode material on one side of the substrate.

[0076] Specifically, refer to Fig. 9 , a whole layer of first electrode material 40 is formed on one side of the substrate 10. The first electrode material 40 may include three layers of materials stacked in sequence, the layer of material closest to the substrate 10 may be Ti, and metals or metal compounds such as Al or TiN are plated on Ti in sequence to form the first electrode material 40.

[0077] S230 , patterning the first electrode material to form a plurality of regular trapezoidal first electrodes.

[0078] Specifically, refer to Fig.10 , Fig.11 and Fig.12 , a layer of photoresist 50 is spin-coated on one side of the first electrode material 40, and after exposure and development, the photoresist 50 outside the pixel is removed. The upper film layer of the area outside the pixel is etched away by an etching process to form a pixelated pattern. By controlling parameters such as etching gas composition, ratio and power, a first electrode 201 of a regular trapezoidal shape is formed on one side of the substrate 10. After the first electrode 201 is formed, all the photoresist 50 can be removed by a wet chemical process.

[0079] S240, forming a whole layer of pixel definition layer material on a side of the first electrode away from the substrate.

[0080] Specifically, refer to Fig.13 A whole layer of pixel definition layer material 60 is formed on the side of the first electrode 201 away from the substrate 10. Exemplarily, the pixel definition layer material 60 may be silicon oxide. A layer of pixel definition layer material 60 with a thickness of 10 nm to 20 nm is plated on the side of the first electrode 201 away from the substrate 10 by a coating process.

[0081] S250, patterning the pixel definition layer material to form a pixel definition layer including a partition portion, a covering portion and a continuous portion; wherein the partition portion is at least partially located on a side of the first electrode away from the substrate, and the continuous portion is located between adjacent first electrodes; the covering portion connects the partition portion and the continuous portion; and the angle between the side wall of the partition portion and the surface of the first electrode away from the substrate is less than or equal to 90 degrees.

[0082] Specifically, refer to Fig.14 , a layer of photoresist 50 is spin-coated on the side of the pixel definition layer material 60 away from the substrate 10. Fig.15 , patterning the pixel definition layer material 60, removing the photoresist 50 above the pixel through processes such as exposure, development and stripping, etching away the pixel definition layer material 60 above the pixel through an etching process, controlling parameters such as etching gas composition, ratio and power, and forming a pixel opening 300. Figure 5 , forming a pixel definition layer 30 including a partition portion 301, a covering portion 302 and a continuous portion 303. Finally, referring to Fig.16, a wet chemical process can be applied to remove all photoresists 50. When etching to form the pixel opening 300, that is, when forming the partition portion 301, the angle between the side wall of the pixel opening 300 and the surface of the first electrode 201 away from the substrate 10 is less than or equal to 90 degrees, so that when the light-emitting functional layer 202 is formed on the side of the pixel definition layer 30 away from the substrate 10, the light-emitting functional layer 202 in the pixel opening 300 and the light-emitting functional layer 202 outside the pixel opening 300 are disconnected, and then the light-emitting functional layer 202 of the adjacent light-emitting device 20 is disconnected, and no current flows, thereby reducing the risk of crosstalk between pixels.

[0083] S260, forming a light-emitting functional layer on a side of the pixel definition layer away from the substrate; wherein, at a side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected.

[0084] Specifically, refer to Figure 2 A light-emitting functional layer 202 is formed on the side of the pixel definition layer 30 away from the substrate 10, and the angle α between the side wall of the pixel opening 300 and the surface of the first electrode 201 away from the substrate 10 is less than or equal to 90 degrees. The thickness of the light-emitting functional layer 202 is less than the thickness of the pixel definition layer 30. At the side wall position of the pixel opening 300, the light-emitting functional layer 202 in the pixel opening 300 and the light-emitting functional layer 202 outside the pixel opening 300 are disconnected, thereby disconnecting the light-emitting functional layer 202 of the adjacent light-emitting device 20, and no current will flow, thereby reducing the risk of crosstalk between pixels.

[0085] S270, forming a second electrode on a side of the light-emitting functional layer away from the substrate.

[0086] Specifically, refer to Figure 2 A second electrode 203 is formed on the side of the light-emitting functional layer 202 away from the substrate 10, and the thickness of the second electrode 203 is greater than the thickness of the pixel definition layer 30. Although the second electrode 203 has a fault, some of the second electrode materials will eventually be connected to each other and not completely disconnected, so that the continuity of the second electrode 203 can be achieved.

[0087] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0088] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; A plurality of light-emitting devices, wherein the light-emitting devices are located on one side of the substrate, and the light-emitting devices include a first electrode, a light-emitting functional layer, and a second electrode which are stacked; A pixel definition layer, wherein the pixel definition layer is arranged between adjacent first electrodes, the pixel definition layer is provided with a plurality of pixel openings, the pixel openings are located on a side of the first electrode away from the substrate, and at a side wall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected.

2. The display panel according to claim 1, characterized in that: An angle between a side wall of the pixel opening and a surface of the first electrode away from the substrate is less than or equal to 90 degrees.

3. The display panel according to claim 1, characterized in that: The thickness of the pixel definition layer is greater than or equal to 10 nm and less than or equal to 20 nm.

4. The display panel according to claim 1, characterized in that: The pixel definition layer comprises a partition portion, a covering portion and a continuous portion; the partition portion is at least partially located on a side of the first electrode away from the substrate, and the continuous portion is located between adjacent first electrodes; the covering portion connects the partition portion and the continuous portion; The thickness of the continuous portion is smaller than the thickness of the first electrode, and a surface of the continuous portion close to the substrate is flush with a surface of the first electrode close to the substrate.

5. The display panel according to claim 1 or 4, characterized in that: In a cross section along a thickness direction of the display panel, the first electrode is in a regular trapezoidal shape.

6. The display panel according to claim 4, characterized in that: An included angle between the covering portion and the substrate is less than or equal to 50°.

7. The display panel according to claim 1, characterized in that: The thickness of the light-emitting functional layer is smaller than the thickness of the pixel definition layer.

8. The display panel according to claim 1, characterized in that: The thickness of the second electrode is greater than or equal to the thickness of the pixel definition layer.

9. A method for preparing a display panel, characterized in that: A display panel applied to any one of claims 1 to 8; The method for preparing the display panel includes: providing a substrate; forming a first electrode on one side of the substrate; forming a pixel definition layer on a side of the first electrode away from the substrate, wherein the pixel definition layer is provided with a plurality of pixel openings; A light-emitting functional layer is formed on a side of the pixel definition layer away from the substrate; wherein, at a sidewall position of the pixel opening, the light-emitting functional layer in the pixel opening and the light-emitting functional layer outside the pixel opening are disconnected; A second electrode is formed on a side of the light-emitting functional layer away from the substrate.

10. The method for preparing a display panel according to claim 9, characterized in that: A first electrode is formed on one side of the substrate, comprising: forming a first electrode material in a whole layer on one side of the substrate; Patterning the first electrode material to form a plurality of regular trapezoidal first electrodes; A pixel definition layer is formed on a side of the first electrode away from the substrate, comprising: forming a whole layer of pixel definition layer material on a side of the first electrode away from the substrate; The pixel definition layer material is patterned to form a pixel definition layer including a partition portion, a covering portion and a continuous portion; wherein the partition portion is at least partially located on a side of the first electrode away from the substrate, and the continuous portion is located between adjacent first electrodes; the covering portion connects the partition portion and the continuous portion; and the angle between the side wall of the partition portion and the surface of the first electrode away from the substrate is less than or equal to 90 degrees.

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