Display substrate and preparation method therefor, and display apparatus

Patent metadata

Field	Value
Publication number	US-2025063897-A1
Application number	US-202418934115-A
Country	US
Kind code	A1
Filing date	Oct 31, 2024
Priority date	Oct 26, 2021
Publication date	Feb 20, 2025
Grant date	—

Abstract

A display substrate and a preparation method thereof, and a display apparatus. The display substrate includes a base substrate, at least one insulating film layer disposed on the base substrate, and a first electrode disposed on a side of the at least one insulating film layer away from the base substrate; wherein a concave-convex structure is disposed on a side of the at least one insulating film layer away from the base substrate, and there is an overlapping area between an orthographic projection of the concave-convex structure on the base substrate and an orthographic projection of the first electrode on the base substrate.

First claim

1 . A display substrate, comprising: a base substrate, at least one insulating film layer disposed on the base substrate, and first electrodes disposed on a side of the at least one insulating film layer away from the base substrate;
wherein the display substrate comprises: a planarization layer, a light emitting structure layer, and an encapsulation layer that are sequentially formed on the base substrate, the light emitting structure layer comprises a pixel definition layer, an anode, a cathode and an organic light emitting layer between the anode and the cathode; the at least one insulating film layer comprises the pixel definition layer and the planarization layer, and the first electrodes comprise the anode and the cathode; and a concave-convex structure is disposed on a side of the anode away from the base substrate and the concave-convex structure comprises serrated protrusions.

2 . The display substrate according to claim 1 , wherein the pixel definition layer comprises a plurality of pixel openings which expose at least part of the anode; the cathode covers the pixel definition layer; the display substrate further comprises a color filter layer, and the color filter layer is at a light exiting side of the light emitting structure layer with respect to the light emitting structure layer;
the at least one insulating film layer has a concave-convex structure on a side away from the base substrate, and there is an overlapping area between an orthographic projection of the concave-convex structure of the at least one insulating film layer on the base substrate and an orthographic projection of the first electrodes on the base substrate; and the concave-convex structure of the at least one insulating film layer comprises serrated protrusions.

3 . The display substrate according to claim 2 , wherein the pixel definition layer comprises a plurality of first convex portion, and a first concave portion is formed between adjacent first convex portions.

4 . The display substrate according to claim 3 , wherein the color filter layer comprises a black matrix and a color filter disposed at an interval, the black matrix has a plurality of opening areas arranged in a matrix, the color filter is at least partially filled in an opening area, the color filter and the black matrix at least have a partially overlapping area where the color filter covers the black matrix.

5 . The display substrate according to claim 4 , wherein the first concave portion is a groove surrounding a pixel opening, and a distance between adjacent grooves is between ⅛ and ⅞ of a distance between an edge of the opening area of the black matrix and an edge of the pixel opening formed in the pixel definition layer.

6 . The display substrate according to claim 4 , wherein the first concave portion is an aperture surrounding a pixel opening, and a width of the aperture is between 0.5 microns and 1.8 microns.

7 . The display substrate according to claim 6 , wherein a plurality of apertures form a plurality of annular structure units, at least one annular structure unit comprises N annular structures disposed around the pixel opening and parallel to each other, and an innermost annular structure comprises a plurality of first apertures, the first apertures are adjacent to the pixel opening, and N is a natural number greater than 1.

8 . The display substrate according to claim 7 , wherein the serrated protrusions of the concave-convex structure of the at least one insulating film layer are formed between the plurality of first apertures, and a distance between adjacent serrated protrusions of the concave-convex structure of the at least one insulating film layer is between ⅛ and ⅞ of a distance between an edge of the opening area of the black matrix and an edge of the pixel opening formed in the pixel definition layer.

9 . The display substrate according to claim 2 , wherein the planarization layer comprises a plurality of second convex portions, a second concave portion is formed between adjacent second convex portions, and the second convex portions are serrated.

10 . The display substrate according to claim 9 , wherein there is an overlapping area between an orthographic projection of the pixel definition layer on the base substrate and the orthographic projection of the concave-convex structure of the at least one insulating film layer on the base substrate.

11 . The display substrate according to claim 9 , wherein a distance between adjacent second convex portions is greater than or equal to a segment difference between a second convex portion and a second concave portion.

12 . The display substrate according to claim 9 , wherein in a direction perpendicular to the base substrate, a thickness of the organic light emitting layer corresponding to the second concave portion is greater than or equal to a thickness of the organic light emitting layer corresponding to the second convex portions.

13 . The display substrate according to claim 9 , wherein a distance between adjacent second convex portions is greater than a thickness of the planarization layer corresponding to the second concave portion.

14 . The display substrate according to claim 9 , wherein a segment difference between a second convex portion and a second concave portion is between ⅛ and ⅞ of a thickness of the planarization layer.

15 . The display substrate according to claim 9 , wherein a segment difference between at least one of the second convex portions and the second concave portion is between 0.2 microns and 0.8 microns.

16 . The display substrate according to claim 2 , wherein the color filter layer is located between the planarization layer and the light emitting structure layer, or between the light emitting structure layer and the encapsulation layer.

17 . The display substrate according to claim 16 , wherein when the color filter layer is located between the light emitting structure layer and the encapsulation layer, the display substrate further comprises a touch structure layer disposed between the encapsulation layer and the color filter layer, the touch structure layer comprises a plurality of touch electrodes, the color filter layer comprises a black matrix and a color filter disposed at an interval, and an orthographic projection of the black matrix on the base substrate comprises an orthographic projection of the touch electrodes on the base substrate.

18 . The display substrate according to claim 2 , wherein
a first concave-convex structure is disposed on a side of the pixel definition layer away from the base substrate, and there is an overlapping area between an orthographic projection of the first concave-convex structure on the base substrate and an orthographic projection of the cathode on the base substrate; and a second concave-convex structure is disposed on a side of the planarization layer away from the base substrate, and there is an overlapping area between an orthographic projection of the second concave-convex structure on the base substrate and an orthographic projection of the anode on the base substrate.

19 . A display apparatus, comprising the display substrate according to claim 1 .

20 . A method for preparing a display substrate, comprising:
forming a planarization layer, a light emitting structure layer, and an encapsulation layer sequentially on a base substrate; wherein the light emitting structure layer comprises a pixel definition layer, an anode, a cathode and an organic light emitting layer between the anode and the cathode; and a c

Assignees

• Boe Technology Group Co Ltd

Inventors

• Huang Haitao
• Xu Chuanxiang
• Yu Yong
• Wu Huili
• Cui Zhao
• Liu Wenqu
• Shu Shi
• Jing Lina
• Meng Detian
• Ni Zibo

Classifications

• H10K59/124 Primary

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H10K59/1201

  Manufacture or treatment · CPC title

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/873

  Encapsulations · CPC title