IP Library › Granted Patent US 12713798
Granted Patent B2
US 12713798 · App. 18/664,180 · Granted Aug 18, 2026

Pixel defining layer, manufacturing method therefor, and display panel

Inventor: Wenjun Hou (Beijing, CN)
Assignee: BOE Technology Group Co., Ltd.
H10K59/173H10K59/122H10K71/00H10K59/8792
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Quick Facts
Patent No.
US 12713798
App. No.
18/664,180
Granted
Aug 18, 2026
Kind
B2
Abstract

A pixel defining layer, a manufacturing method therefor, and a display panel are provided. The pixel defining layer comprises a first sub-defining layer, a light absorbing layer, and a second sub-defining layer sequentially stacked on a substrate. The light absorbing layer is used for absorbing light for exposing the first sub-defining layer. An orthographic projection of the light absorbing layer on the substrate covers the outer edge of an orthographic projection of the first sub-defining layer on the substrate away from the surface of the substrate.

Claims (36)

1 . A pixel defining layer, comprising a first sub-defining layer, a light absorbing layer, and a second sub-defining layer which are sequentially laminated on a substrate,

wherein the light absorbing layer is configured to absorb light for exposing the first sub-defining layer, and an orthographic projection of the light absorbing layer on the substrate covers an outer edge of an orthographic projection of a surface, away from the substrate, of the first sub-defining layer on the substrate;

the orthographic projection of the light absorbing layer on the substrate covers the orthographic projection of the surface, away from the substrate, of the first sub-defining layer on the substrate; and

a shape of an outer edge of the orthographic projection of the light absorbing layer on the substrate is similar to a shape of at least one of an outer edge of an orthographic projection of the first sub-defining layer on the substrate and an outer edge of an orthographic projection of the second sub-defining layer on the substrate.

2 . The pixel defining layer according to claim 1 , wherein the outer edge of the orthographic projection of the surface, away from the substrate, of the first sub-defining layer on the substrate is inside the orthographic projection of the light absorbing layer on the substrate.

3 . The pixel defining layer according to claim 1 , wherein the orthographic projection of the light absorbing layer on the substrate covers an outer edge of an orthographic projection of a surface, close to the substrate, of the second sub-defining layer on the substrate.

4 . The pixel defining layer according to claim 1 , wherein the orthographic projection of the light absorbing layer on the substrate comprises a plurality of rings, and each of the rings surrounds an orthographic projection of one pixel unit on the substrate; and

a shape of at least one of an inner edge and an outer edge of the orthographic projection of the light absorbing layer on the substrate is similar to a shape of at least one of an outer edge of an orthographic projection of the first sub-defining layer on the substrate and an outer edge of an orthographic projection of the second sub-defining layer on the substrate.

5 . The pixel defining layer according to claim 4 , wherein a width of the ring ranges from 1 to 5 microns.

6 . The pixel defining layer according to claim 1 , wherein the orthographic projection of the surface, away from the substrate, of the first sub-defining layer on the substrate is inside an orthographic projection of a surface, close to the substrate, of the first sub-defining layer on the substrate.

7 . The pixel defining layer according to claim 1 , wherein an orthographic projection of a surface, away from the substrate, of the second sub-defining layer on the substrate is inside an orthographic projection of a surface, close to the substrate, of the second sub-defining layer on the substrate.

8 . The pixel defining layer according to claim 1 , wherein materials of the first sub-defining layer and the second sub-defining layer are cured after being exposed and developed.

9 . The pixel defining layer according to claim 1 , wherein materials of the first sub-defining layer and the second sub-defining layer are melted after being exposed and developed.

10 . The pixel defining layer according to claim 1 , wherein materials of the first sub-defining layer and the second sub-defining layer are the same.

11 . The pixel defining layer according to claim 1 , wherein a material of the first sub-defining layer comprises a hydrophilic material.

12 . The pixel defining layer according to claim 1 , wherein a material of the second sub-defining layer comprises a hydrophobic material.

13 . The pixel defining layer according to claim 1 , wherein a thickness of the first sub-defining layer ranges from 0.2 to 1 micron, and a direction of the thickness is perpendicular to a direction of a contact surface between the substrate and the first sub-defining layer; and

a thickness of the second sub-defining layer ranges from 0.5 to 3 microns.

14 . The pixel defining layer according to claim 1 , wherein a material of the light absorbing layer comprises at least one of salicylate esters, benzones, benzotriazoles, substituted acrylonitriles, triazines, hindered amines, and carbon black materials.

15 . The pixel defining layer according to claim 1 , wherein a material of at least one of the first sub-defining layer and the second sub-defining layer comprises at least one of polyimide, polymethyl methacrylate, fluorinated polyimide, and fluorinated polymethyl methacrylate.

16 . A method for manufacturing a pixel defining layer, comprising:

forming a first material layer on a substrate;

forming a light absorbing layer on a surface of the first material layer away from the substrate, wherein the light absorbing layer is configured to absorb light exposing the first material layer;

forming a second material layer on a surface of the light absorbing layer away from the substrate; and

exposing and developing the first material layer and the second material layer to obtain the pixel defining layer, wherein

the first material layer is exposed and developed to obtain a first sub-defining layer, the second material layer is exposed and developed to obtain a second sub-defining layer, and an orthographic projection of the light absorbing layer on the substrate covers an outer edge of an orthographic projection of a surface, away from the substrate, of the first sub-defining layer on the substrate;

the orthographic projection of the light absorbing layer on the substrate covers the orthographic projection of the surface, away from the substrate, of the first sub-defining layer on the substrate; and

a shape of an outer edge of the orthographic projection of the light absorbing layer on the substrate is similar to a shape of at least one of an outer edge of an orthographic projection of the first sub-defining layer on the substrate and an outer edge of an orthographic projection of the second sub-defining layer on the substrate.

17 . An organic light-emitting diode display panel, comprising a pixel defining layer, wherein the pixel defining layer comprises a first sub-defining layer, a light absorbing layer, and a second sub-defining layer which are sequentially laminated on a substrate;

the light absorbing layer is configured to absorb light for exposing the first sub-defining layer, and an orthographic projection of the light absorbing layer on the substrate covers an outer edge of an orthographic projection of a surface, away from the substrate, of the first sub-defining layer on the substrate;

the orthographic projection of the light absorbing layer on the substrate covers the orthographic projection of the surface, away from the substrate, of the first sub-defining layer on the substrate; and

a shape of an outer edge of the orthographic projection of the light absorbing layer on the substrate is similar to a shape of at least one of an outer edge of an orthographic projection of the first sub-defining layer on the substrate and an outer edge of an orthographic projection of the second sub-defining layer on the substrate.

18 . The organic light-emitting diode display panel according to claim 17 , wherein the orthographic projection of the light absorbing layer on the substrate comprises a plurality of rings, and each of the rings surrounds an orthographic projection of one pixel unit on the substrate; and

a shape of at least one of an inner edge and an outer edge of the orthographic projection of the light absorbing layer on the substrate is similar to a shape of at least one of an outer edge of an orthographic projection of the first sub-defining layer on the substrate and an outer edge of an orthographic projection of the second sub-defining layer on the substrate.

19 . The organic light-emitting diode display panel according to claim 17 , wherein the orthographic projection of the surface, away from the substrate, of the first sub-defining layer on the substrate is inside an orthographic projection of a surface, close to the substrate, of the first sub-defining layer on the substrate.

20 . The organic light-emitting diode display panel according to claim 17 , wherein an orthographic projection of a surface, away from the substrate, of the second sub-defining layer on the substrate is inside an orthographic projection of a surface, close to the substrate, of the second sub-defining layer on the substrate.