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

Patent metadata

Field	Value
Publication number	US-2022359631-A1
Application number	US-202117612958-A
Country	US
Kind code	A1
Filing date	Feb 9, 2021
Priority date	Feb 9, 2021
Publication date	Nov 10, 2022
Grant date	—

Abstract

The present disclosure provides a display substrate and a method for manufacturing the same and a display device. The display substrate includes: sub-pixels disposed on a base substrate and each including a sub-pixel aperture area, a reflective layer, an insulating layer, independent anode patterns, a light-emitting function layer and a cathode. An orthographic projection of the reflective layer onto the base substrate at least partially overlaps an orthographic projection of the sub-pixel aperture area onto the base substrate. The insulating layer is on one side of the reflective layer away from the base substrate. The anode patterns are on one side of the insulating layer away from the base substrate, and each of orthographic projections of the anode patterns onto the base substrate at least partially overlaps the orthographic projection of the sub-pixel aperture area onto the base substrate. The light-emitting function layer is on one side of the anode patterns away from the base substrate. An orthographic projection of the light-emitting function layer onto the base substrate is within the orthographic projection of the sub-pixel aperture area onto the base substrate. The cathode is on one side of the light-emitting function layer away from the base substrate. An orthographic projection of the cathode onto the base substrate covers the orthographic projection of the light-emitting function layer onto the base substrate.

First claim

1 . A display substrate, comprising:
a base substrate; and a plurality of sub-pixels on the base substrate; wherein the sub-pixel includes a sub-pixel aperture area; the sub-pixel further includes: a reflective layer, wherein an orthographic projection of the reflective layer onto the base substrate at least partially overlaps an orthographic projection of the sub-pixel aperture area onto the base substrate; an insulating layer on one side of the reflective layer away from the base substrate; a plurality of anode patterns independent of each other, wherein the plurality of anode patterns are on one side of the insulating layer away from the base substrate, and each of orthographic projections of the plurality of anode patterns onto the base substrate at least partially overlaps the orthographic projection of the sub-pixel aperture area onto the base substrate; a light-emitting function layer on one side of the plurality of anode patterns away from the base substrate, wherein an orthographic projection of the light-emitting function layer onto the base substrate at least partially overlaps the orthographic projection of the sub-pixel aperture area onto the base substrate; and a cathode on one side of the light-emitting function layer away from the base substrate, wherein an orthographic projection of the cathode onto the base substrate covers the orthographic projection of the light-emitting function layer onto the base substrate; an orthographic projection of a first portion of the cathode onto the base substrate is located within the orthographic projection of the sub-pixel aperture area onto the base substrate; there is a segment difference in a surface of the first portion away from the base substrate; in a direction perpendicular to the base substrate, a height of the segment difference is less than or equal to a thickness of the anode pattern.

2 . The display substrate according to claim 1 , wherein a thickness D 1 of the anode pattern in the direction perpendicular to the base substrate satisfies: 100 Å≤D 1 ≤1200 Å.

3 . The display substrate according to claim 1 , wherein the plurality of anode patterns in the sub-pixel are arranged along a first direction; and a shortest distance H between two adjacent sides of adjacent anode patterns satisfies: 0.5 μm≤H≤1.5 μm.

4 . The display substrate according to claim 1 , wherein the anode pattern is a single-layer structure, and the anode pattern is made of indium tin oxide.

5 . The display substrate according to claim 1 , wherein the insulating layer includes a transparent insulating layer.

6 . The display substrate according to claim 1 , wherein the insulating layer is made of an inorganic material.

7 . The display substrate according to claim 1 , wherein a thickness D 2 of the insulating layer in a direction perpendicular to the base substrate satisfies: 200 Å≤D 2 ≤1500 Å.

8 . The display substrate according to claim 1 , wherein the sub-pixel further includes a bonding layer, and the bonding layer is between the reflective layer and the base substrate;
wherein the sub-pixel further includes a protection layer, and the protection layer is between the reflective layer and the insulating layer.

9 . (canceled)

10 . The display substrate according to claim 8 , wherein the bonding layer, the protection layer and the anode pattern are made of the same material.

11 . The display substrate according to claim 1 , wherein the sub-pixel further includes: a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer which are sequentially stacked in a direction away from the base substrate;
wherein the hole injection layer and the hole transport layer are both located between the light-emitting function layer and the plurality of anode patterns; and the electron transport layer and the electron injection layer are both located between the light-emitting function layer and the cathode.

12 . The display substrate according to claim 1 , wherein the sub-pixel further includes a driving circuit; the driving circuit is between the plurality of anode patterns and the base substrate; and the driving circuit is configured to provide driving signals for the plurality of anode patterns, respectively.

13 . The display substrate according to claim 12 , wherein the driving circuit includes a plurality of driving sub-circuits corresponding to the plurality of anode patterns in a one-to-one manner; the driving sub-circuit is coupled to the corresponding anode pattern through a via-hole structure, and is configured to provide a driving signal for the corresponding anode pattern.

14 . The display substrate according to claim 12 , wherein the driving circuit includes driving sub-circuits and a plurality of control sub-circuits respectively coupled to the driving sub-circuits; the plurality of control sub-circuits are corresponding to the plurality of anode patterns in a one-to-one manner; each control sub-circuit is coupled to the corresponding anode pattern through the corresponding via-hole structure; the plurality of control sub-circuits turn on electrical connection between the driving sub-circuits and the corresponding anode patterns in a time-sharing manner.

15 . The display substrate according to claim 13 , wherein the display substrate further includes a pixel defining layer; the pixel defining layer is located at one side of the anode pattern away from the base substrate; the pixel defining layer defines a plurality of sub-pixel aperture areas; an orthographic projection of the pixel defining layer onto the base substrate at least partially overlaps an orthographic projection of the via-hole structure onto the base substrate.

16 . The display substrate according to claim 15 , wherein the pixel defining layer includes a first defining portion and a second defining portion; an orthographic projection of the first defining portion onto the base substrate at least partially overlaps the orthographic projection of the via-hole structure onto the base substrate; an orthographic projection of the second defining portion onto the base substrate does not overlap the orthographic projection of the via-hole structure onto the base substrate;
the orthographic projection of the cathode onto the base substrate does not overlap the orthographic projection of the first defining portion onto the base substrate; and the orthographic projection of the cathode onto the base substrate at least partially overlaps the orthographic projection of the second defining portion onto the base substrate.

17 . The display substrate according to claim 15 , wherein the reflective layer is located between the driving circuit and the pixel defining layer.

18 . The display substrate according to claim 13 , wherein the via-hole structure extends through the insulating layer; and the orthographic projection of the via-hole structure onto the base substrate does not overlap the orthographic projection of the reflective layer onto the base substrate;
wherein the via-hole structures corresponding to the plurality of anode patterns are arranged along a first direction.

19 . (canceled)

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

21 . A method for manufacturing a display substrate, comprising:
fabricating a plurality of sub-pixels on a base substrate, wherein the sub-pixel includes a sub-pixel aperture area; wherein the step of fabricating the plurality of sub-pixels specifically includes: fabricating a

Assignees

• Boe Technology Group Co Ltd

Inventors

• Sun Yanliu
• Liang Pengxia
• Shi Ge
• Han Jiahui
• Dong Xue
• Zhang Shiyu
• Liu Yujie
• Yang Song
• Wang Yuyao

Classifications

• H01L27/3246

  Electricity · mapped topic

• H01L27/3258 Primary

  Electricity · mapped topic

• H01L2227/323

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• H01L51/5209

  Electricity · mapped topic