Color filter and preparation method therefor, array substrate and display device

Patent metadata

Field	Value
Publication number	US-12372839-B2
Application number	US-202418646815-A
Country	US
Kind code	B2
Filing date	Apr 26, 2024
Priority date	Mar 28, 2023
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A color filter, a preparation method therefore, an array substrate and a display device are provided. The color filter includes a plurality of filter units ( 20 ) provided on a base substrate ( 10 ) for transmitting light of different colors, and a light shielding layer ( 30 ) located between adjacent filter units ( 20 ) for transmitting light of different colors. The filter unit ( 20 ) includes a first surface facing the base substrate ( 10 ), a second surface facing away from the base substrate, and a third surface connecting the first surface and the second surface. The light shielding layer ( 30 ) is provided on the third surface of at least one of two adjacent filter units ( 20 ) transmitting light of different colors.

First claim

The invention claimed is:

1. A color filter, comprising a plurality of filter units provided on a base substrate for transmitting light of different colors, and a light shielding layer located between adjacent filter units for transmitting light of different colors, wherein each of the filter units comprises a first surface facing the base substrate, a second surface facing away from the base substrate, and a third surface connecting the first surface and the second surface, and the light shielding layer is provided on the third surface of at least one of two adjacent filter units for transmitting light of different colors;
wherein adjacent filter units transmitting light of different colors have overlapping portions, and the light shielding layer is at least partially located between the overlapping portions;
wherein a portion of the light shielding layer is located on a third surface of an overlapping portion, and the other portion of the light shielding layer extends in a direction parallel to the base substrate and forms an extending portion;
wherein the light shielding layer completely covers an edge of the third surface close to the base substrate and partially extends in a direction parallel to the base substrate, and the extending portion is located between a corresponding filter unit and the base substrate.

2. The color filter according to claim 1 , wherein the plurality of filter units comprise a plurality of first filter units transmitting light of a first color, a plurality of second filter units transmitting light of a second color, and a plurality of third filter units transmitting light of a third color, and the light shielding layer is not provided on third surfaces of the plurality of first filter units or the plurality of second filter units or the plurality of third filter units.

3. The color filter according to claim 1 , wherein the plurality of filter units comprise a plurality of first filter units transmitting light of a first color, a plurality of second filter units transmitting light of a second color, and a plurality of third filter units transmitting light of a third color; and
a first filter unit or a second filter unit or a third filter unit is used as a reference filter unit, the light shielding layer between the reference filter unit and a filter unit adjacent thereto comprises a first light shielding layer and a second light shielding layer, the first light shielding layer is provided on a third surface of the reference filter unit, and the second light shielding layer is provided at least partially on a side of the first light shielding layer away from the reference filter unit.

4. The color filter according to claim 1 , wherein at least two adjacent filter units transmitting light of different colors have overlapping portions, and an orthographic projection of the light shielding layer on the base substrate comprises an orthographic projection of the overlapping portions on the base substrate.

5. The color filter according to claim 1 , wherein orthographic projections of third surfaces of at least two adjacent filter units transmitting light of different colors on the base substrate overlap, and orthographic projections of the second surfaces the at least two adjacent filter units transmitting light of different colors on the base substrate do not overlap.

6. The color filter according to claim 1 , wherein the light shielding layer is not provided on third surfaces of non-overlapping portions of adjacent filter units transmitting light of different colors.

7. The color filter according to claim 1 , wherein the light shielding layer extends from 0.5 um to 3 um in the direction parallel to the base substrate.

8. The color filter according to claim 1 , wherein a slope angle of the third surface of at least one of two adjacent filter units transmitting light of different colors is 70 degrees to 90 degrees.

9. The color filter according to claim 1 , wherein a material of the light shielding layer is copper.

10. The color filter according to claim 1 , wherein the filter units comprise a plurality of stacked inorganic film layers.

11. An array substrate, comprising the color filter according to claim 1 , and a circuit structure layer provided on a side of the plurality of filter units away from the base substrate, wherein the circuit structure layer comprises a transistor, a gate line, a data line and a first electrode, and the transistor comprises a gate electrode connected to the gate line, an active layer, a source electrode connected to the data line, and a drain electrode connected to the first electrode.

12. A display device, comprising the color filter according to claim 1 .

13. A preparation method for a color filter, comprising:
forming a plurality of first filter units on a base substrate, wherein each of the first filter units comprises a first surface facing the base substrate, a second surface facing away from the base substrate, and a third surface connecting the first surface and the second surface;
forming a first protective layer on a side of the plurality of first filter units away from the base substrate, wherein the first protective layer comprises a plurality of first protective units that completely cover the first filter units;
forming a plurality of second filter units on the base substrate, wherein each of the second filter units comprises a first surface facing the base substrate, a second surface facing away from the base substrate, and a third surface connecting the first surface and the second surface;
etching the plurality of first protective units to completely remove the first protective units on the second surfaces of the first filter units and at least partially retain the first protective units on the third surfaces of the first filter units; or etching the plurality of first protective units to remove the first protective units on the second surfaces of the first filter units, and retain the first protective units covered by the second filter units on the third surfaces of the first filter units, wherein the first protective units retained on the third surfaces of the first filter units are a first light shielding layer;
forming a second protective layer on a side of the plurality of first filter units and the plurality of second filter units away from the base substrate, wherein the second protective layer comprises a plurality of second protective units that cover adjacent first filter unit and second filter unit;
forming a plurality of third filter units on the base substrate; and
etching the plurality of second protective units to remove the second protective units on the second surfaces of the first filter units and the second protective units on the second surfaces of the second filter units, at least partially retain the second protective units on the third surfaces of the second filter units, and at least partially retain the second protective units on the first light shielding layer, wherein the second protective units retained on the third surfaces of the second filter units and the second protective units retained on the first light shielding layer are a second light shielding layer; or etching the plurality of second protective units to remove the second protective units on the second surfaces of the first filter units and the second protective units on the second surfaces of the second filter units, retain the second protective units covered by the third filter units on the third surfaces of the first filter units, and retain the second protective units covered by the third filter units on the third surfaces of the second filter units, wherein the second protective units retained on the thi

Assignees

• Boe Technology Group Co Ltd

Inventors

• Lu Xinhong
• Qu Yan
• Ning ce
• Yang Wei
• Cao Zhanfeng
• Zhou Jingshang
• Wang Lizhong

Classifications

• G02F1/136209

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F1/1368 Primary

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• G02F1/133516

  Methods for their manufacture, e.g. printing, electro-deposition or photolithography · CPC title

• G02F1/133514

  Colour filters · CPC title