Pixel defining layer and manufacturing method thereof, array substrate and display device

1. A pixel defining layer, comprising: a plurality of pixel defining structures arranged in an array,

the pixel defining structure having a first bottom surface and a second bottom surface opposite each other, and a side surface c, the side surface is a convex surface;

an first inclination angle is between a target cut surface of the side surface and the first bottom surface, wherein the target cut surface is a cut surface of the side surface at a boundary with the first bottom surface;

an second inclination angle is between an auxiliary cut surface of the side surface and the second bottom surface, wherein the auxiliary cut surface is a cut surface of the side surface at a boundary with the second bottom surface; and

the second inclination angle is larger than the first inclination angle.

2. The pixel defining layer of claim 1 , wherein slopes of the side surface relative to an abscissa axis comprise a positive slope and a negative slope, the abscissa axis being parallel to a setting surface of the pixel defining layer; the distance between a transition point at which the slope of the side surface changes from a positive slope to a negative slope and the setting surface ranges from 0.3 micron to 0.6 micron.

3. The pixel defining layer of claim 1 , wherein the first inclination angle ranges from 30 degrees to 60 degrees.

4. The pixel defining layer of claim 1 , wherein the pixel defining structure comprises a lyophobic material layer repelling liquid.

5. The pixel defining layer of claim 4 , wherein the pixel defining structure further comprises: a lyophilic material layer between a setting surface of the pixel defining layer and the lyophobic material layer, the lyophilic material layer attracting liquid.

6. The pixel defining layer of claim 5 , wherein the lyophilic material layer has a thickness of 0.3 micron.

7. The pixel defining layer of claim 1 , wherein the distance between the first bottom surface and the second bottom surface ranges from 0.5 micron to 3 microns.

8. The pixel defining layer of claim 2 , wherein the first inclination angle ranges from 30 degrees to 60 degrees, and the distance between the first bottom surface and the second bottom surface ranges from 0.5 micron to 3 microns;

the pixel defining structure satisfies any one of the following conditions:

the pixel defining structure comprises a lyophobic material layer;

the pixel defining structure comprises: a lyophilic material layer and a lyophobic material layer, and the lyophilic material layer is located between the setting surface of the pixel defining layer and the lyophobic material layer;

wherein the lyophilic material layer attracts liquid, and the lyophobic material layer repels liquid; the lyophilic material layer has a thickness of 0.3 micron.

9. The pixel defining layer of claim 5 , wherein the distance between the first bottom surface and the second bottom surface ranges from 0.5 micron to 3 microns, the thickness of the lyophilic material layer is 0.3 micron, and the thickness of the lyophobic material layer ranges from 0.2 microns to 2.7 microns.

10. A method of manufacturing a pixel defining layer, comprising:

forming a pixel defining layer on a base substrate, the pixel defining layer comprising a plurality of pixel defining structures arranged in an array;

wherein the pixel defining structure has a first bottom surface and a second bottom surface opposite each other, and a side surface located between the first bottom surface and the second bottom surface, the side surface being is a convex surface:

an first inclination angle is between a target cut surface of the side surface and the first bottom surface, wherein the target cut surface is a cut surface of the side surface at a boundary with the first bottom surface;

an second inclination angle is between an auxiliary cut surface of the side surface and the second bottom surface, wherein the auxiliary cut surface is a cut surface of the side surface at a boundary with the second bottom surface; and

the second inclination angle is larger than the first inclination angle.

11. The method of claim 10 , wherein forming a pixel defining layer on a base substrate comprises:

forming a first pattern layer on the base substrate; the first pattern layer having at least one hollow;

filling the hollow of the first pattern layer with a pixel defining material;

removing the first pattern layer after curing the pixel defining material, to obtain the pixel defining layer on the base substrate.

12. The method of claim 11 , wherein forming a first pattern layer on the base substrate comprises:

forming a first pattern material layer on the base substrate;

forming a photoresist layer on the first pattern material layer;

exposing and developing the photoresist layer to obtain a photoresist pattern;

etching, by a wet etching process, the first pattern material layer formed with the photoresist pattern;

peeling off the photoresist pattern to obtain the first pattern layer.

13. The method of claim 12 , wherein the first pattern material layer comprises a metal layer.

14. The method of claim 13 , wherein the material of the metal layer comprises aluminum, and etching, by a wet etching process, the first pattern material layer formed with the photoresist pattern, comprises:

etching the first pattern material layer formed with the photoresist pattern for 20 seconds to 50 seconds by using hydrochloric acid having a concentration ranging from 0.1% to 5% at a temperature ranging from 30 degrees to 60 degrees.

15. The method of claim 11 , wherein the pixel defining material comprises a lyophobic, material repelling liquid.

16. The method of claim 11 , wherein the pixel defining material comprises a lyophobic material and a lyophilic material, and filling the hollow of the first pattern layer with a pixel defining material comprises:

filling the hollow of the first pattern layer with a lyophilic material, and curing the lyophilic material to obtain a lyophilic material layer; and

filling the hollow of the first pattern layer formed with the lyophilic material layer with the lyophobic material, and curing the lyophobic material to obtain a lyophobic material layer;

the lyophilic material attracting liquid, and the lyophobic material repelling liquid.

17. The method of claim 14 , wherein the pixel defining material satisfies any one of the following conditions:

the pixel defining material comprises a lyophobic material;

the pixel defining material comprises a lyophobic material and a lyophilic material, and filling the hollow of the first pattern layer with the pixel defining material comprising: filling the hollow of the first pattern layer with a lyophilic material, and curing the lyophilic material to obtain a lyophilic material layer; filling the hollow of the first pattern layer formed with the lyophilic material layer with the lyophobic material, and curing the lyophobic material to obtain a lyophobic material layer;

wherein the lyophilic material attracts liquid, and the lyophobic material repels liquid.

18. An array substrate, wherein a pixel defining layer in the array substrate comprises: a plurality of pixel defining structures arranged in an array;

the pixel defining structure has a first bottom surface and a second bottom surface opposite each other, and a side surface located between the first bottom surface and the second bottom surface, the side surface is a convex surface;

an first inclination angle is between a target cut surface of the side surface and the first bottom surface, wherein the target cut surface is a cut surface of the side surface at a boundary with the first bottom surface;

an second inclination angle is between an auxiliary cut surface of the side surface and the second bottom surface, wherein the auxiliary cut surface is a cut surface of the side surface at a boundary with the second bottom surface; and

the second inclination angle is larger than the first inclination angle.

19. A display device, comprising the array substrate of claim 17 .