Display substrate and display device

Patent metadata

Field	Value
Publication number	US-2024315087-A1
Application number	US-202418674957-A
Country	US
Kind code	A1
Filing date	May 27, 2024
Priority date	Dec 16, 2022
Publication date	Sep 19, 2024
Grant date	—

Abstract

A display substrate including a pixel definition layer on a base substrate, the pixel definition layer having a pixel opening, the pixel opening exposing at least a portion of a surface of a first electrode, and at least a portion of a second electrode covering the pixel opening; the pixel definition layer includes a second side surface away from the first electrode, the second side surface at least includes a protrusion structure, the protrusion structure at least includes a protrusion structure top surface; the protrusion structure top surface is an arc surface, and along a light emitting direction of the light emitting functional layer, a surface of the arc surface away from the base substrate is between a surface of the first electrode away from the base substrate and a surface of the first electrode close to the base substrate.

First claim

1 . A display substrate, comprising:
a base substrate; a light emitting element disposed on the base substrate, the light emitting element comprises a first electrode, a light emitting functional layer, and a second electrode that are sequentially stacked along a direction away from the base substrate; a pixel definition layer disposed on the base substrate, the pixel definition layer is provided with a pixel opening, the pixel opening exposes at least a portion of a surface of the first electrode, and at least a portion of the second electrode covers the pixel opening; wherein the pixel definition layer comprises a second side surface on a side away from the first electrode, the second side surface at least comprises a protrusion structure, the protrusion structure at least comprises a protrusion structure top surface; the protrusion structure top surface is an arc surface, and along a light emitting direction of the light emitting functional layer, a surface of the arc surface away from the base substrate is between a surface of the first electrode away from the base substrate and a surface of the first electrode close to the base substrate.

2 . The display substrate according to claim 1 , wherein the protrusion structure further comprises a protrusion structure side surface, an obtuse angle is formed between an extension direction of the protrusion structure side surface and a surface of the base substrate, and the protrusion structure side surface is an arc surface.

3 . The display substrate according to claim 1 , wherein a thickness of the protrusion structure is smaller than a thickness of the first electrode.

4 . The display substrate according to claim 1 , wherein the second side surface further comprises a second step, the protrusion structure is between the second step and the base substrate, the second step comprises a second step side surface, and a slope angle of the second step side surface is 80 degrees to 90 degrees.

5 . The display substrate according to claim 4 , wherein an orthographic projection of at least a portion of the second step side surface is not overlapped with an orthographic projection of the first electrode on the base substrate.

6 . The display substrate according to claim 4 , wherein a thickness of the protrusion structure is smaller than a thickness of the second step.

7 . The display substrate according to claim 1 , wherein the second side surface comprises m stages of second steps that are sequentially arranged along the light emitting direction of the light emitting functional layer, a second step comprises a second step side surface, a slope angle of a second step side surface of a second step of a z-th stage is greater than a slope angle of a second step side surface of a second step of a k-th stage, and the second step of the z-th stage is on a side of the second step of the k-th stage close to the base substrate;
wherein z, k and m are all natural numbers, m is greater than 1, and 0<z<k≤m.

8 . The display substrate according to claim 1 , wherein the second side surface further comprises a second step of a first stage, a second step of a second stage, and a second step of a third stage that are sequentially arranged along the light emitting direction of the light emitting functional layer;
there is no overlapping area between any two of an orthographic projection of the second step of the first stage on the base substrate, an orthographic projection of the second step of the second stage on the base substrate, and an orthographic projection of the second step of the third stage on the base substrate; and a slope angle of a second step side surface of the second step of the first stage is greater than a slope angle of a second step side surface of the second step of the second stage, and the slope angle of the second step side surface of the second step of the second stage is greater than a slope angle of a second step side surface of the second step of the third stage.

9 . The display substrate according to claim 1 , wherein the pixel definition layer further comprises a first side surface on a side close to the first electrode, the first side surface comprises n stages of first steps that are sequentially arranged along the light emitting direction of the light emitting functional layer, a first step comprises a first step side surface, a slope angle of a first step side surface of a first step of an i-th stage is greater than a slope angle of a first step side surface of a first step of a j-th stage, and the first step of the i-th stage is on a side of the first step of the j-th stage close to the base substrate;
wherein i, j and n are all natural numbers, n is greater than 1, and 0<i<j≤n.

10 . The display substrate according to claim 9 , wherein the first side surface comprises 3 stages of first steps that are sequentially arranged along the light emitting direction of the light emitting functional layer, a slope angle of a first step side surface of a first step of a first stage is greater than a slope angle of a first step side surface of a first step of a second stage, and the slope angle of the first step side surface of the first step of the second stage is greater than a slope angle of a first step side surface of a first step of a third stage.

11 . The display substrate according to claim 10 , wherein the slope angle of the first step side surface of the first step of the first stage is 65 degrees to 75 degrees; the slope angle of the first side surface of the first step of the second stage is 50 degrees to 60 degrees; and the slope angle of the first step side surface of the first step of the third stage is 40 degrees to 45 degrees.

12 . The display substrate according to claim 9 , wherein a thickness of the first step of the i-th stage is greater than a thickness of the first step of the j-th stage, and a length of the first step of the i-th stage is greater than a length of the first step of the j-th stage.

13 . The display substrate according to claim 9 , wherein the second electrode comprises a first portion covering the first side surface and a second portion covering a second step of the second side surface, the first portion is connected with the second portion, a surface of the first portion comprises at least one first curved surface, a surface of the second portion comprises at least one second curved surface, a curvature change of the at least one first curved surface is less than a curvature change of the at least one second curved surface.

14 . The display substrate according to claim 13 , wherein a slope angle of the second portion is 35 degrees to 45 degrees.

15 . The display substrate according to claim 9 , wherein a length of the protrusion structure is greater than a sum of a total length of the n stages of the first steps of the first side surface and a length of a second step of the second side surface.

16 . The display substrate according to claim 9 , wherein a length of the first step side surface of the first step is 10% to 15% of a thickness of the first electrode.

17 . The display substrate according to claim 1 , wherein a surface of the second electrode is uneven, and a distance between a highest point of the surface of the second electrode and a lowest point of the surface of the second electrode is less than 800 Å.

18 . The display substrate according to claim 9 , wherein the light emitting functional layer comprises a first film layer portion located on a side close to the base substrate and a second film layer portion located on a side away from the base substra

Assignees

• Yunnan Invensight Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wei Junbo
• Yang Shengji
• Lu Pengcheng
• Huang Kuanta
• Tian Yuanlan

Classifications

• H10K2102/351

  Thickness · CPC title

• H10K77/111

  Flexible substrates · CPC title

• H10K59/80521

  characterised by their shape · CPC title

• H10K59/122 Primary

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

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title