Display substrate and manufacturing method therefor, display panel, and display device

Patent metadata

Field	Value
Publication number	US-12446427-B2
Application number	US-202218022525-A
Country	US
Kind code	B2
Filing date	Mar 17, 2022
Priority date	Jun 30, 2021
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A display substrate includes a light-emitting structure layer provided on a base; the light-emitting structure layer includes an anode layer, a first film layer group, and a second film layer group that are sequentially stacked; the anode layer includes one or more anodes; the first film layer group includes at least one film layer located between an anode and a cathode in an OLED device; the second film layer group includes a cathode, and at least one film layer located between the anode and the cathode in the OLED device; the orthographic projection of the second film layer group on the base includes the orthographic projection of the first film layer group on the base, an overlapping portion of all film layers in the first film layer group serves as a first portion of the first film layer group.

First claim

The invention claimed is:

1. A display substrate, comprising a driving circuit layer provided on a base substrate and a light emitting structure layer provided on a side of the driving circuit layer away from the base substrate, wherein the driving circuit layer comprises a pixel driving circuit, the light emitting structure layer comprises an organic light emitting diode (OLED) device connected with the pixel driving circuit, the OLED device comprises an anode, a light emitting functional layer, and a cathode stacked sequentially, and the light emitting functional layer comprises a plurality of film layers which are stacked;
the light emitting structure layer comprises an anode layer, a first film layer group, and a second film layer group stacked sequentially, wherein the anode layer comprises one or more anodes, the first film layer group comprises at least one film layer of the light emitting functional layer, and the second film layer group comprises at least one film layer of the light emitting functional layer and the cathode;
an orthographic projection of the second film layer group on the base substrate contains an orthographic projection of the first film layer group on the base substrate, an overlapping portion of all film layers in the first film layer group serves as a first portion of the first film layer group, an orthographic projection region of a part of the first portion of the first film layer group covering a surface of the anode and directly contacting the surface of the anode on the base substrate is a light emitting region of the display substrate, and an orthographic projection region of a portion of the second film layer group that is not overlapped with the first portion of the first film layer group on the base substrate is configured not to emit light;
a distance between an edge of the first film layer group and an edge of the second film layer group is different at a plurality of positions.

2. The display substrate according to claim 1 , wherein the light emitting functional layer comprises a light emitting layer and any one or more of following film layers: a hole injection layer, a hole transport layer, an electron block layer, a hole block layer, an electron transport layer, and an electron injection layer.

3. The display substrate according to claim 2 , wherein the first film layer group or the second film layer group comprises the light emitting layer.

4. The display substrate according to claim 2 , wherein the first film layer group comprises any one or more of the hole injection layer, the hole transport layer, and the electron block layer.

5. The display substrate according to claim 2 , wherein the second film layer group comprises any one or more of the hole block layer, the electron transport layer, and the electron injection layer.

6. The display substrate according to claim 1 , wherein the first film layer group comprises two or more film layers, and orthographic projections of any two film layers of the first film layer group on the base substrate contains orthographic projections of the anodes on the base substrate with a same number and same positions.

7. The display substrate according to claim 1 , wherein a part of the portion of the second film layer group that is not overlapped with the first film layer group covers the surface of the anode.

8. The display substrate according to claim 1 , wherein a film surface of the first film layer group is continuous or discontinuous.

9. The display substrate according to claim 1 , wherein any one film layer of the second film layer group is an integrated structure.

10. The display substrate according to claim 1 , wherein the film layers of the first film layer group are formed by any one or more processes of ink jet printing, spraying, in-situ growth, exposure development, and laser ablation.

11. The display substrate according to claim 1 , wherein the light emitting structure layer further comprises a pixel definition layer provided on a side of the anode layer facing away from the base substrate, the pixel definition layer comprises a plurality of first partition sections extending along a first direction and a plurality of second partition sections extending along a second direction, the plurality of first partition sections and the plurality of second partition sections intersect with each other to define a plurality of pixel openings, and the pixel openings expose the surface of the anode;
a thickness of the first partition sections is greater than a thickness of the second partition sections, and the first film layer group is partitioned by the first partition sections.

12. The display substrate according to claim 11 , wherein a width of a first partition section in the second direction is greater than or equal to 10 microns.

13. The display substrate according to claim 11 , wherein a width of a second partition section in the first direction is greater than or equal to 20 microns.

14. The display substrate according to claim 11 , wherein the first portion of the first film layer group at least has a first film thickness and a second film thickness, and the first film thickness is greater than the second film thickness; and
a part of the first portion of the first film layer group covering the second partition sections has the first film thickness, and the part of the first portion of the first film layer group covering the surface of the anode and directly contacting the surface of the anode has the second film thickness.

15. The display substrate according to claim 1 , wherein a thickness of the first film layer group is 10 nm to 300 nm.

16. A display panel, comprising the display substrate according to claim 1 .

17. A display device, comprising the display substrate according to claim 1 .

18. A method for manufacturing a display substrate, wherein the display substrate comprises an OLED device, the OLED device comprises an anode, a light emitting functional layer and a cathode stacked sequentially, the light emitting functional layer comprises a plurality of stacked film layers, and the method comprises:
forming a driving circuit layer on a base substrate, and the driving circuit layer comprises a pixel driving circuit;
forming an anode layer on a side of the driving circuit layer away from the base substrate, and the anode layer comprises one or more anodes;
forming a first film layer group on a surface of the anode facing away from the base substrate, and the first film layer group comprises at least one film layer of the light emitting functional layer; and
forming a second film layer group on a surface of the first film layer group facing away from the base substrate, and the second film layer group comprises at least one film layer of the light emitting functional layer and the cathode;
wherein an orthographic projection of the second film layer group on the base substrate contains an orthographic projection of the first film layer group on the base substrate, an overlapping portion of all film layers in the first film layer group serves as a first portion of the first film layer group, an orthographic projection region of a part of the first portion of the first film layer group covering a surface of the anode and directly contacting the surface of the anode on the base substrate is a light emitting region of the display substrate, and an orthographic projection region of a portion of the second film layer group that is not overlapped with the first portion of the first film layer group on the base substrate is configured not to emit light; a distance between an

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Sun Li
• Wu Zhongyuan
• Xu Pan
• Wang Hongli
• Ma Kaihong
• Shih Huaiting

Classifications

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/80517

  Multilayers, e.g. transparent multilayers · CPC title

• H10K59/1201

  Manufacture or treatment · CPC title

• H10K2102/351

  Thickness · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title