Color filter and method for preparing the same, method for preparing alignment mark for spacer, and method for detecting position accuracy

Patent metadata

Field	Value
Publication number	US-9946109-B2
Application number	US-201515036352-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Jun 5, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

The present application discloses a color filter, comprising: a substrate; a black matrix layer formed on the substrate; color film layers formed on at least one first sub-pixel opening area and a plurality of second sub-pixel opening areas on the substrate; wherein the size of the first sub-pixel opening area is smaller than the size of the second sub-pixel opening area; the size of the color film layer on the first sub-pixel opening area is smaller than the size of the color film layer on the second sub-pixel opening area; a flat layer formed on the color film layer; an alignment mark formed on the flat layer and located at a designated position around the first sub-pixel opening area; a spacer layer formed on the flat layer.

First claim

What is claimed is:

1. A color filter, comprising:
a substrate;
a black matrix layer formed on the substrate;
color film layers formed on at least one first sub-pixel opening area and a plurality of second sub-pixel opening areas on the substrate; wherein the size of the first sub-pixel opening area is smaller than the size of the second sub-pixel opening area; the size of the color film layer on the first sub-pixel opening area is smaller than the size of the color film layer on the second sub-pixel opening area;
a flat layer formed on the color film layer;
an alignment mark formed on the flat layer and located at a designated position around the first sub-pixel opening area;
a spacer layer formed on the flat layer.

2. The color filter according to claim 1 , wherein the color film layers on the first sub-pixel opening area and on the second sub-pixel opening areas are any one of R, G and B film layer.

3. The color filter according to claim 1 , wherein the designated position around the first sub-pixel opening area is any one of the positions at a preset distance above, below, to the left of, and to the right of the first sub-pixel opening area.

4. The color filter according to claim 1 , wherein the alignment mark has a square or circular shape.

5. A liquid crystal panel comprising the color filter according to claim 1 .

6. A method for preparing the color filter of claim 1 , the method, comprising:
providing a substrate;
forming a black matrix layer on the substrate, and forming at least one first sub-pixel opening area and a plurality of second sub-pixel opening areas, wherein the size of the first sub-pixel opening area is smaller than the size of the second sub-pixel opening area;
forming color film layers on the first sub-pixel opening area and the second sub-pixel opening areas; wherein the size of the color film layer on the first sub-pixel opening area is smaller than the size of the color film layer on the second sub-pixel opening area;
forming a flat layer on the color film layer;
forming an alignment mark and a spacer layer on the flat layer, the alignment mark being located at a designated position around the first sub-pixel opening area.

7. A method for preparing an alignment mark for a spacer, the method comprising:
in the fabrication of a black matrix layer of a color filter, forming at least one first sub-pixel opening area and a plurality of second sub-pixel opening areas on a substrate, a size of the first sub-pixel opening area smaller than a size of each of the second sub-pixel opening areas;
forming color film layers on the first sub-pixel opening area and the second sub-pixel opening areas respectively, a size of the color film layer on the first sub-pixel opening area smaller than a size of the color film layer on the second sub-pixel opening areas;
preparing a flat layer on the color film layers; and
in the fabrication of a spacer layer, fabricating an alignment mark for the spacer layer at a designated position around the first sub-pixel opening area, fabrication of the spacer layer comprising fabricating the spacer layer on the flat layer.

8. The method according to claim 7 , wherein the color film layers on the first sub-pixel opening area and on the second sub-pixel opening areas are any one of R, G and B film layers.

9. The method according to claim 7 , wherein the first sub-pixel opening area and the second sub-pixel opening areas are located at areas not covered by the black matrix on the substrate.

10. The method according to claim 7 , wherein the designated position around the first sub-pixel opening area is any one of positions at a preset distance above, below, to the left of, and to the right of the first sub-pixel opening area.

11. The method according to claim 7 , wherein the alignment mark has a symmetric shape.

12. The method according to claim 11 , wherein the alignment identifier has a square or circular shape.

13. A method for detecting a position accuracy of a spacer, the method comprising:
acquiring at least one first sub-pixel opening area formed on a substrate and an alignment mark formed at a designated position around the first sub-pixel opening area, a size of the first sub-pixel opening area smaller than a size of each of a plurality of second sub-pixel opening areas formed on the substrate, the first sub-pixel opening area and the second sub-pixel opening areas formed in the fabrication of a black matrix layer of a color filter, color film layers formed on the first sub-pixel opening area and the second sub-pixel opening areas respectively, a size of the color film layer on the first sub-pixel opening area smaller than a size of the color film layer on the second sub-pixel opening areas, a flat layer formed on the color film layers, and the spacer layer fabricated on the flat layer;
calculating a position difference between the first sub-pixel opening area and the alignment mark; and
calculating a position accuracy of the spacer according to the position difference.

14. The method according to claim 13 , wherein the color film layers on the first sub-pixel opening area and on the second sub-pixel opening areas are any one of R, G and B film layers.

15. The method according to claim 13 , wherein the designated position around the first sub-pixel opening area is any one of positions at a preset distance above, below, to the left of, and to the right of the first sub-pixel opening area.

16. The method according to claim 13 , wherein the alignment mark has a square or circular shape.

17. The method according to claim 13 , wherein calculating the position difference between the first sub-pixel opening area and the alignment mark comprises:
determining a center position of the first sub-pixel opening area according to an acquired vertex position of the first sub-pixel opening area;
determining a center position of the alignment mark according to an acquired vertex position of the alignment mark;
calculating the position difference between the center position of the first sub-pixel opening area and the center position of the alignment mark.

18. The method according to claim 13 , wherein calculating the position accuracy of the spacer according to the position difference comprises:
according to the position difference and a preset design position difference, calculating the position accuracy of the spacer.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Li Min
• Jiang Jingjing
• Xiao Yu
• Li Xiaoguang
• Yang Tonghua

Classifications

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G01B11/272

  using photoelectric detection means · CPC title

• G02F1/133514

  Colour filters · CPC title

• G02F1/133516 Primary

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

• G02F1/1333 Primary

  Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) · CPC title