Pixel defining structure and manufacturing method thereof, display panel and display device

Patent metadata

Field	Value
Publication number	US-12127442-B2
Application number	US-202318213902-A
Country	US
Kind code	B2
Filing date	Jun 26, 2023
Priority date	May 11, 2018
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

A pixel defining structure includes a first sub-pixel defining structure surrounding a first sub-pixel region configured to form a first sub-pixel having a first color. The first sub-pixel defining structure includes a lyophilic portion one the bottom side of the first sub-pixel region and a lyophobic portion on a side opposite to the bottom side. The pixel defining structure includes a second sub-pixel defining structure surrounding a second sub-pixel region configured to form a second sub-pixel having a second color. The second sub-pixel defining structure includes a lyophilic portion one the bottom side of the second sub-pixel region and a lyophobic portion on a side opposite to the bottom side. The second color is different from the first color. Thicknesses of the lyophilic portion of the first sub-pixel defining structure and the lyophilic portion of the second sub-pixel defining structure are different.

First claim

What is claimed is:

1. A display panel, comprising:
a substrate comprising an anode layer, a hole transport layer, and a hole injection layer, and
a pixel defining structure forming on one surface of the substrate and for defining a plurality of sub-pixels, the pixel defining structure comprising:
a first sub-pixel defining structure surrounding a first sub-pixel region, wherein the first sub-pixel region has a first color, the first color is red, the first sub-pixel defining structure comprises a lyophilic portion and a lyophobic portion, and the lyophobic portion of the first sub-pixel defining structure is further away from the substrate than the lyophilic portion of the first sub-pixel defining structure away from the substrate; and
a second sub-pixel defining structure surrounding a second sub-pixel region, wherein the second sub-pixel region has a second color, the second color is green, the second sub-pixel defining structure comprises a lyophilic portion and a lyophobic portion, and the lyophobic portion of the second sub-pixel defining structure is further away from the substrate than the lyophilic portion of the second sub-pixel defining structure away from the substrate;
wherein an area of the first sub-pixel region is less than an area of the second sub-pixel region, and a thickness of the lyophilic portion of the first sub-pixel defining structure is less than a thickness of the lyophilic portion of the second sub-pixel defining structure, and
wherein a first sub-pixel driving structure for driving a first sub-pixel and a second sub-pixel driving structure for driving a second sub-pixel are formed on said surface of the substrate, and the first sub-pixel driving structure and the second sub-pixel driving structure respectively form the bottom of the first sub-pixel region and the bottom of the second sub-pixel region.

2. The pixel display panel according to claim 1 , wherein a thickness of the first sub-pixel defining structure is less than a thickness of the second sub-pixel defining structure.

3. A method for manufacturing a pixel defining structure, comprising:
forming a first sub-pixel defining structure surrounding a first sub-pixel region and a second sub-pixel defining structure surrounding a second sub-pixel region on one surface of a substrate, wherein the substrate comprises an anode layer a hole transport layer and a hole injection laver,
wherein
the first sub-pixel region has a first color, the first color is red, the first sub-pixel defining structure comprises a lyophilic portion and a lyophobic portion, the lyophobic portion of the first sub-pixel defining structure is further away from the substrate than the lyophilic portion of the first sub-pixel defining structure away from the substrate,
the second sub-pixel region has a second color, the second color is green, the second sub-pixel defining structure comprises a lyophilic portion and a lyophobic portion, the lyophobic portion of the second sub-pixel defining structure is further away from the substrate than the lyophilic portion of the second sub-pixel defining structure away from the substrate,
an area of the first sub-pixel region is less than an area of the second sub-pixel region and
a thickness of the lyophilic portion of the first sub-pixel defining structure is less than a thickness of the lyophilic portion of the second sub-pixel defining structure.

4. The method for manufacturing a pixel defining structure according to claim 3 , wherein forming a first sub-pixel defining structure surrounding a first sub-pixel region and a second sub-pixel defining structure surrounding a second sub-pixel region on one surface of a substrate comprises:
coating a first photoresist comprising a lyophilic material and a lyophobic material on said surface of the substrate, to cover the first sub-pixel region and the second sub-pixel region,
performing lithography and etching on the first photoresist to form the first sub-pixel defining structure surrounding the first sub-pixel region,
coating a second photoresist comprising a lyophilic material and a lyophobic material on said surface of the substrate, to cover the second sub-pixel region, the thickness of the second photoresist is larger than the thickness of the first photoresist, and

performing lithography and etching on the second photoresist to form the second sub-pixel defining structure surrounding the second sub-pixel region.

5. The method for manufacturing a pixel defining structure according to claim 3 , wherein forming a first sub-pixel defining structure surrounding a first sub-pixel region and a second sub-pixel defining structure surrounding a second sub-pixel region on one surface of a substrate comprises:
coating a first photoresist comprising a lyophilic material and a lyophobic material on said surface of the substrate, to cover the first sub-pixel region and the second sub-pixel region,
performing lithography and etching on the first photoresist to form the second sub-pixel defining structure surrounding the second sub-pixel region,
coating a second photoresist comprising a lyophilic material and a lyophobic material on said surface of the substrate, to cover the first sub-pixel region, the thickness of the second photoresist is smaller than the thickness of the photoresist, and
performing lithography and etching on the first photoresist to form the first sub-pixel defining structure surrounding the second sub-pixel region.

6. The method for manufacturing a pixel defining structure according to claim 3 , wherein forming a first sub-pixel defining structure surrounding a first sub-pixel region and a second sub-pixel defining structure surrounding a second sub-pixel region on one surface of a substrate comprises:
coating a photoresist on said surface of the substrate, to cover the first sub-pixel region and the second sub-pixel region,
performing lithography and etching on the photoresist to form the first sub-pixel defining structure and the second sub-pixel defining structure of the same thickness,
performing surface processing on the surface of the sidewall of the first sub-pixel defining structure, such that the portion of the first sub-pixel defining structure close to the substrate has a lyophilic sidewall surface, to form a lyophilic portion of the first sub-pixel defining structure, and the portion of the first sub-pixel defining structure far away from the substrate has a lyophobic sidewall surface, to form a lyophobic portion of the first sub-pixel defining structure, and
performing surface processing on the surface of the sidewall of the second sub-pixel defining structure, such that the portion of the second sub-pixel defining structure close to the substrate has a lyophilic sidewall surface, to form a lyophilic portion of the second sub-pixel defining structure, and the portion of the second sub-pixel defining structure far away from the substrate has a lyophobic sidewall surface, to form a lyophobic portion of the second sub-pixel defining structure.

7. A display panel comprising a substrate and a pixel defining structure according to claim 3 , forming on one surface of the substrate, wherein a first sub-pixel driving structure for driving a first sub-pixel and a second sub-pixel driving structure for driving a second sub-pixel are formed on said surface of the substrate, and the first sub-pixel driving structure and the second sub-pixel driving structure respectively form the bottom of the first sub-pixel region and the bottom of the second sub-pixel region.

8. A display device comprising the display panel according to claim 1 .

9. A display device comprising the display panel according to claim 2 .

10. A display device comprising the displa

Assignees

• Boe Technology Group Co Ltd

Inventors

• Hou Wenjun

Classifications

• H10K2102/351

  Thickness · CPC title

• H10K59/1201

  Manufacture or treatment · CPC title

• H10K71/233

  by photolithographic etching · CPC title

• H10K71/00

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

• H10K71/13

  using printing techniques, e.g. ink-jet printing or screen printing · CPC title