Display substrate and preparation method thereof, and display apparatus

Patent metadata

Field	Value
Publication number	US-12238973-B2
Application number	US-202117637458-A
Country	US
Kind code	B2
Filing date	Apr 21, 2021
Priority date	Apr 21, 2021
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A display substrate includes a driving circuit layer arranged on a base and a light emitting structure layer arranged on one side, away from the base, of the driving circuit layer; the light emitting structure layer includes an anode, a pixel definition layer, an organic light emitting layer, a cathode, and an auxiliary electrode; the pixel definition layer has a first pixel opening exposing the anode and a second pixel opening exposing the auxiliary electrode; the organic light emitting layer connected to the anode and the cathode connected to the organic light emitting layer are arranged in the first pixel opening; the organic light emitting layer separated from the auxiliary electrode and the cathode located on one side, away from the base, of the organic light emitting layer are arranged in the second pixel opening; and the cathode is connected to the auxiliary electrode in the second pixel opening.

First claim

The invention claimed is:

1. A display substrate, comprising a driving circuit layer arranged on a base and a light emitting structure layer arranged on one side, away from the base, of the driving circuit layer, wherein the light emitting structure layer comprises an anode, a pixel definition layer, an organic light emitting layer, a cathode, and an auxiliary electrode;
the pixel definition layer has a first pixel opening exposing the anode and a second pixel opening exposing the auxiliary electrode; the organic light emitting layer connected to the anode and the cathode connected to the organic light emitting layer are arranged in the first pixel opening; the organic light emitting layer separated from the auxiliary electrode and the cathode located on one side, away from the base, of the organic light emitting layer are arranged in the second pixel opening; and the cathode is connected to the auxiliary electrode in the second pixel opening,
wherein the auxiliary electrode comprises a first auxiliary electrode, a second auxiliary electrode arranged on one side, away from the base, of the first auxiliary electrode, and a third auxiliary electrode arranged on one side, away from the base, of the second auxiliary electrode; an orthographic projection of the second auxiliary electrode on the base is located within a range of an orthographic projection of the third auxiliary electrode on the base; and the orthographic projection of the second auxiliary electrode on the base is located within a range of an orthographic projection of the first auxiliary electrode on the base.

2. The display substrate according to claim 1 , wherein, in a plane perpendicular to the base, a distance between an edge of the auxiliary electrode close to an edge of a top surface of the organic light emitting layer, and the edge of the top surface of the organic light emitting layer located in the second pixel opening is greater than 1 μm.

3. The display substrate according to claim 1 , wherein, in a plane perpendicular to the base, a ratio of a thickness of an edge part, close to the auxiliary electrode, of the cathode located on a surface of the organic light emitting layer away from the base, to a thickness of an edge part, close to the pixel definition layer, of the cathode is 0.8 to 1.2.

4. The display substrate according to claim 1 , wherein a distance between an edge, close to the organic light emitting layer, of a surface, close to the base, of the third auxiliary electrode, and an edge, close to the organic light emitting layer, of a surface, away from the base, of the second auxiliary electrode is less than 1.25 μm.

5. The display substrate according to claim 1 , wherein the cathode is in contact with each of: one side of an organic light emitting block away from the base, the first auxiliary electrode, the second auxiliary electrode, and the third auxiliary electrode.

6. The display substrate according to claim 5 , wherein for the auxiliary electrode and the organic light emitting block that are stacked, the cathode is in contact with each of: a surface of the organic light emitting block away from the base, a side surface of the organic light emitting block, a side surface of the third auxiliary electrode, a surface, close to the base, of a part of the third auxiliary electrode protruding from the second auxiliary electrode, and a side surface of the second auxiliary electrode.

7. The display substrate according to claim 1 , wherein the anode comprises a first anode layer, a second anode layer arranged on one side, away from the base, of the first anode layer, and a third anode layer arranged on one side, away from the base, of the second anode; an orthographic projection of the second anode layer on the base is located within a range of an orthographic projection of the first anode layer on the base; and the orthographic projection of the second anode layer on the base is located within a range of an orthographic projection of the third anode layer on the base.

8. The display substrate according to claim 7 , wherein the first anode layer and the first auxiliary electrode are arranged in a same layer and are made of a same material; the second anode layer and the second auxiliary electrode are arranged in a same layer and are made of a same material; and the third anode layer and the third auxiliary electrode are arranged in a same layer and are made of a same material.

9. The display substrate according to claim 1 , wherein the organic light emitting layer is arranged on the first auxiliary electrode; a slope is formed on one side, close to the auxiliary electrode, of the organic light emitting layer; the cathode is arranged on the slope; a thickness, in a direction perpendicular to the slope, of the cathode located on the slope is less than a thickness, in a direction perpendicular to the base, of the cathode located on one side, away from the base, of the organic light emitting layer.

10. The display substrate according to claim 1 , wherein an orthographic projection of the second pixel opening on the base is located within a range of an orthographic projection of the first auxiliary electrode on the base.

11. The display substrate according to claim 1 , wherein the cathode comprises a first horizontal overlapping part and a second side wall overlapping part; the first horizontal overlapping part is overlapped with the first auxiliary electrode; the second side wall overlapping part is overlapped with the second auxiliary electrode; and a thickness of the second side wall overlapping part in a direction parallel to the base is greater than a thickness of the first horizontal overlapping part in a direction perpendicular to the base.

12. The display substrate according to claim 11 , wherein the second side wall overlapping part is connected to the first auxiliary electrode; the second side wall overlapping part is in contact with a surface, close to the base, of the third auxiliary electrode; and the second side wall overlapping part is connected to the first horizontal overlapping part.

13. The display substrate according to claim 1 , wherein the driving circuit layer comprises: a transistor and a power electrode located on the base, a passivation layer located on one side, away from the base, of the transistor and the power electrode, and a planarization layer located on one side, away from the base, of the passivation layer; the passivation layer and the planarization layer have anode vias and electrode vias; the anode vias expose a drain electrode of the transistor; and the electrode vias expose the power electrode.

14. The display substrate according to claim 13 , wherein the anode is connected to the drain electrode of the transistor through the anode vias; and the auxiliary electrode is connected to the power electrode through the electrode vias.

15. The display substrate according to claim 13 , wherein the light emitting structure layer further comprises an organic light emitting block; the organic light emitting block is arranged on one side, away from the base, of the auxiliary electrode; an orthographic projection of the organic light emitting block on the base is overlapped with an orthographic projection of the auxiliary electrode on the base; the organic light emitting block and the organic light emitting layer are arranged in a same layer and are made of a same material, and the organic light emitting block is isolated from the organic light emitting layer.

16. The display substrate according to claim 15 , wherein a thickness, in a direction parallel to the base, of the cathode located on a side wall of the organic light

Assignees

• Hefei Xinsheng Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wang Jun
• Wang Haitao
• Su Tongshang
• Wang Qinghe
• Liu Ning
• Zhou Bin
• Cheng Jun

Classifications

• H10K59/1315

  comprising structures specially adapted for lowering the resistance · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K50/824

  combined with auxiliary electrodes · CPC title

• H10K59/80

  Constructional details · CPC title

• H10K59/80522

  combined with auxiliary electrodes · CPC title