Substrate including a color filter layer made of electrochromic material, liquid crystal display panel and display device

Patent metadata

Field	Value
Publication number	US-9599851-B2
Application number	US-201414312884-A
Country	US
Kind code	B2
Filing date	Jun 24, 2014
Priority date	Apr 3, 2014
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The present invention discloses a substrate for a liquid crystal display panel, the liquid crystal display panel and a display device. The substrate comprises: a base substrate; a color layer disposed on the base substrate; and first and second transparent electrodes disposed on opposite sides of the color filter layer and electrically connected with the color filter layer. A color of the color filter layer can be changed based on gray scale of an image to be displayed on the liquid crystal display panel by applying a voltage signal to the color filter layer through the first and second transparent electrodes, thereby a light leakage in a dark state of the liquid crystal display panel is avoided, and thus it is possible to improve contrast of the liquid crystal display panel.

First claim

What is claimed is:

1. A substrate for a liquid crystal display panel, comprising:
a base substrate;
a color filter layer disposed on the base substrate and configured as a color filter layer of the liquid crystal display panel, the color filter layer including a plurality of color filters including red filters, green filters and blue filters arranged in a matrix;
a plurality of black matrix units each located between two adjacent color filters so as to space the two adjacent color filters apart from each other;
a plurality of thin film transistors, each thin film transistor being arranged so that its projection area on the base substrate is located within a projection area of a corresponding black matrix unit on the base substrate; and
first and second transparent electrodes respectively disposed on left and right sides of the color filter layer such that the first transparent electrode, the color filter layer and the second transparent electrode are disposed in the same layer on the base substrate, and the first transparent electrode and the second transparent electrode are electrically connected with the color filter layer,
wherein the color filter layer comprises an electrochromic material layer, which is configured to change its color based on gray scale of an image to be displayed on the liquid crystal display panel.

2. The substrate according to claim 1 , wherein the color filter layer is configured to maintain a normal light filtering color when the liquid display panel displays a high gray scale image and change its color when the liquid display panel displays a low gray scale image.

3. The substrate according to claim 2 , wherein the color filter layer is configured to change its color into black when the liquid display panel displays the low gray scale image.

4. The substrate according to claim 1 , wherein at least one of the first and second transparent electrodes includes a plurality of sub-electrodes each corresponding to one of the plurality of color filters respectively.

5. The substrate according to claim 4 , wherein each of the
plurality of thin film transistors corresponds to and is electrically connected with one of the plurality of sub-electrodes respectively.

6. The substrate according to claim 1 , wherein the electrochromic material comprises at least one of polyaniline, viologen and polythiophene materials.

7. A liquid crystal display panel comprising:
an array substrate;
an opposing substrate disposed opposite to the array substrate;
liquid crystal molecules disposed between the array substrate and the opposing substrate;
a color filter layer disposed on the opposing substrate or the array substrate, the color filter layer including a plurality of color filters including red filters, green filters and blue filters arranged in a matrix;
a plurality of black matrix units each located between two adjacent color filters so as to space the two adjacent color filters apart from each other;
a plurality of thin film transistors, each thin film transistor being arranged so that its projection area on the base substrate is located within a projection area of a corresponding black matrix unit on the base substrate; and
first and second transparent electrodes respectively disposed on left and right sides of the color filter layer such that the first transparent electrode, the color filter layer and the second transparent electrode are disposed in the same layer on the opposing substrate or on the array substrate, and the first transparent electrode and the second transparent electrode are electrically connected with the color filter layer,
wherein the color filter layer comprises an electrochromic material layer, which is configured to change its color based on gray scale of an image to be displayed on the liquid crystal display panel.

8. The liquid crystal display panel according to claim 7 , wherein the color filter layer is configured to maintain a normal light filtering color when the liquid display panel displays a high gray scale image and change its color when the liquid display panel displays a low gray scale image.

9. The liquid crystal display panel according to claim 8 , wherein the color filter layer is configured to change its color into black when the liquid display panel displays the low gray scale image.

10. The liquid crystal display panel according to claim 7 , wherein at least one of the first and second transparent electrodes includes a plurality of sub-electrodes each corresponding to one of the plurality of color filters respectively.

11. The liquid crystal display panel according to claim 10 , wherein each of the
plurality of thin film transistors corresponds to and is electrically connected with one of the first transparent sub-electrodes respectively.

12. The liquid crystal display panel according to claim 7 , wherein the electrochromic material comprises at least one of polyaniline, viologen and polythiophene materials.

13. A display device comprising the liquid crystal display panel according to claim 7 .

Assignees

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

Inventors

• Zhang Chunbing
• Wang Zheng
• Jin Xianghua

Classifications

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title

• G02F2001/1515

  Physics · mapped topic

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/133514 Primary

  Colour filters · CPC title

• G02F2001/1635

  the pixel comprises active switching elements, e.g. TFT · CPC title