Display substrate, method for manufacturing the same, and display device

Patent metadata

Field	Value
Publication number	US-12238969-B2
Application number	US-202117615835-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Feb 26, 2021
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

The present disclosure provides a display substrate, a method for manufacturing the same, and a display device. The display substrate includes a drive circuit layer disposed on a base substrate and a light emitting structure layer disposed on a side of the drive circuit layer away from the base substrate. The light emitting structure layer includes an anode, an organic light emitting layer, a cathode, and an auxiliary electrode. The organic light emitting layer is respectively connected to the anode and the cathode, and the cathode is connected to the auxiliary electrode; in a plane parallel to the display substrate, an edge of the auxiliary electrode is provided with a structure depressed towards a center of the auxiliary electrode.

First claim

What is claimed is:

1. A display substrate, comprising a drive circuit layer disposed on a base substrate and a light emitting structure layer disposed on a side of the drive circuit layer away from the base substrate, wherein the light emitting structure layer comprises an anode, an organic light emitting layer, a cathode, and an auxiliary electrode, the organic light emitting layer is respectively connected to the anode and the cathode, and the cathode is connected to the auxiliary electrode; in a plane perpendicular to the display substrate, the auxiliary electrode comprises a first auxiliary electrode and a second auxiliary electrode disposed on a side of the first auxiliary electrode away from the base substrate; in a plane parallel to the display substrate, a shape of the first auxiliary electrode and the second auxiliary electrode comprises a polygon provided with a groove; two edges of the first auxiliary electrode and the second auxiliary electrode extending along a first direction are each provided with a first groove depressed towards an inside of the auxiliary electrode along a second direction, and the first direction and the second direction intersect with each other; wherein that the cathode is connected to the auxiliary electrode comprises: the cathode covers a side surface of the second auxiliary electrode and a surface of a side, adjacent to the base substrate, of a portion of the second auxiliary electrode which protrudes from the first auxiliary electrode.

2. The display substrate according to claim 1 , wherein the polygon provided with the groove comprises an H-shape or an X-shape.

3. The display substrate according to claim 1 , wherein the first auxiliary electrode and the second auxiliary electrode which are stacked form a T-shaped structure.

4. The display substrate according to claim 3 , wherein the light emitting structure layer further comprises an organic light emitting block, the organic light emitting block is disposed on a side of the second auxiliary electrode away from the base substrate, and an orthographic projection of the organic light emitting block on the base substrate is within the range of an orthographic projection of the second auxiliary electrode in the auxiliary electrode on the base substrate; the organic light emitting block and the organic light emitting layer are disposed in a same layer and are made of a same material, and the organic light emitting block is disposed to be isolated from the organic light emitting layer.

5. The display substrate according to claim 4 , wherein the orthographic projection of the organic light emitting block on the base substrate and an orthographic projection of the organic light emitting layer on the base substrate at least partially overlap with each other.

6. The display substrate according to claim 4 , wherein a thickness of an edge of the organic light emitting layer close to the organic light emitting block is less than a thickness of the organic light emitting block.

7. The display substrate according to claim 4 , wherein the cathode is in contact connection with the auxiliary electrode by wrapping the organic light emitting block and the auxiliary electrode.

8. The display substrate according to claim 4 , wherein for the first auxiliary electrode, the second auxiliary electrode, and the organic light emitting block which are stacked, the cathode covers a surface of the organic light emitting block away from the base substrate and covers a side surface of the organic light emitting block; and
an orthographic projection of a cathode of the second auxiliary electrode on the side away from the base substrate and an orthographic projection of a cathode of the second auxiliary electrode on the side adjacent to the base substrate on the base substrate at least partially overlap with each other.

9. The display substrate according to claim 1 , wherein the anode comprises a first anode layer, a second anode layer disposed on a side of the first anode layer away from the base substrate, and a third anode layer disposed on a side of the second anode layer away from the base substrate; the first anode layer, the second anode layer, and the third anode layer which are stacked form an I-shape; the second anode layer and a first auxiliary electrode in the auxiliary electrode are disposed in a same layer and are made of a same material; the third anode layer and a second auxiliary electrode in the auxiliary electrode are disposed in a same layer and are made of a same material.

10. The display substrate according to claim 1 , wherein on the plane perpendicular to the display substrate, the drive circuit layer comprises: a transistor and a power supply electrode disposed on the base substrate, the power supply electrode and a drain electrode of the transistor being disposed in a same layer; a passivation layer covering the transistor and the power supply electrode, the passivation layer being provided with a first via hole and a second via hole, with the first via hole exposing the drain electrode of the transistor, and the second via hole exposing the power supply electrode; a planarization layer disposed on the passivation layer, the planarization layer being provided with an anode via hole and an auxiliary electrode via hole, with the anode via hole exposing the first via hole, and the auxiliary electrode via hole exposing the second via hole.

11. The display substrate according to claim 10 , wherein an orthographic projection of the anode on the base substrate is within the range of an orthographic projection of the anode via hole on the base substrate; a first anode layer in the anode is connected to the drain electrode of the transistor through the first via hole; an orthographic projection of the auxiliary electrode on the base substrate is within the range of an orthographic projection of the auxiliary electrode via hole on the base substrate.

12. The display substrate according to claim 10 , wherein the light emitting structure layer further comprises a connection electrode, the connection electrode is connected to the power supply electrode through the second via hole in the auxiliary electrode via hole, and the first auxiliary electrode in the auxiliary electrode is disposed on a side of the connection electrode away from the base substrate; and the connection electrode and the first anode layer in the anode are disposed in a same layer and are made of a same material.

13. The display substrate according to claim 12 , wherein a width of the connection electrode is greater than a width of a second auxiliary electrode; and
the connection electrode, first auxiliary electrode, and second auxiliary electrode which are stacked form an I-shape.

14. The display substrate according to claim 10 , wherein the light emitting structure layer further comprises a pixel definition layer, the pixel definition layer is provided with a first pixel opening and a second pixel opening, the first pixel opening exposes part of a surface of a third anode layer in the anode, and the second pixel opening exposes all of a surface of a second auxiliary electrode in the auxiliary electrode.

15. The display substrate according to claim 10 , wherein in a plane parallel to the display substrate, the display substrate comprises multiple sub-pixels, the multiple sub-pixels are sequentially disposed respectively along the first direction and the second direction; in the second direction, auxiliary electrode via holes are located between anode via holes of adjacent sub-pixels.

16. The display substrate according to claim 15 , wherein in the second direction, at least two sub

Assignees

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

Inventors

• Su Tongshang
• Zhou Bin
• Cheng Jun
• Wang Qinghe
• Huang Yongchao
• Zhang Dacheng
• Yan Liangchen

Classifications

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/80522

  combined with auxiliary electrodes · CPC title

• H10K59/80521

  characterised by their shape · CPC title

• H10K59/1213 Primary

  the pixel elements being TFTs · CPC title

• H10K71/00

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