Display module, driving method thereof, and display apparatus

Patent metadata

Field	Value
Publication number	US-12436437-B2
Application number	US-202318687350-A
Country	US
Kind code	B2
Filing date	Jan 20, 2023
Priority date	Jan 20, 2023
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A display module, including a first liquid crystal panel and a light modulation layer, where the first liquid crystal panel includes a first substrate and a second substrate opposite to each other, and a first liquid crystal layer between the first substrate and the second substrate; the light modulation layer is on a side of the second substrate away from the first substrate, and configured to reflect first colored light; and liquid crystal in the first liquid crystal layer is configured to present a planar texture state or a focal conic texture state in response to an action of an electric field, where the liquid crystal in the first liquid crystal layer presenting the planar texture state reflects second colored light with a color different from the first colored light, while the liquid crystal in the first liquid crystal layer presenting the focal conic texture state transmits light.

First claim

What is claimed is:

1. A display module, comprising a first liquid crystal panel and a light modulation layer, wherein the first liquid crystal panel comprises a first substrate and a second substrate opposite to each other, and a first liquid crystal layer between the first substrate and the second substrate;
the light modulation layer is on a side of the second substrate away from the first substrate, and configured to reflect first colored light; and
liquid crystal in the first liquid crystal layer is configured to present a planar texture state or a focal conic texture state in response to an action of an electric field, wherein the liquid crystal in the first liquid crystal layer presenting the planar texture state reflects second colored light with a color different from a color of the first colored light, while the liquid crystal in the first liquid crystal layer presenting the focal conic texture state transmits light,
wherein the first colored light and the second colored light are configured to be capable of being mixed into white light.

2. The display module according to claim 1 , wherein the light modulation layer comprises at least one colored ink layer configured to reflect the first colored light.

3. The display module according to claim 2 , wherein the light modulation layer further comprises a first black base on a side of a farthest colored ink layer from the second substrate away from the second substrate.

4. The display module according to claim 3 , wherein the first black base is a black ink layer; and
the light modulation layer further comprises a white ink layer between the farthest colored ink layer from the second substrate and the black ink layer.

5. The display module according to claim 1 , wherein the light modulation layer comprises a second liquid crystal panel;
the second liquid crystal panel comprises a third substrate and a fourth substrate opposite to each other, and a second liquid crystal layer between the third substrate and the fourth substrate, and
liquid crystal in the second liquid crystal layer is configured to present a planar texture state or a focal conic texture state in response to an action of an electric field, the liquid crystal in the second liquid crystal layer presenting the planar texture state reflect the first colored light, and the liquid crystal in the second liquid crystal layer presenting the focal conic texture state transmits light.

6. The display module according to claim 5 , wherein the light modulation layer further comprises a black base on a side of the second liquid crystal panel away from the first liquid crystal panel.

7. The display module according to claim 6 , wherein the first liquid crystal layer and the second liquid crystal layer are each made of a material comprising cholesteric liquid crystal molecules and a chiral agent.

8. The display module according to claim 6 , wherein the display module is divided into a plurality of subpixel regions arranged in an array;
the third substrate comprises a third base substrate, and a first common electrode on a side of the third base substrate close to the second liquid crystal layer; and
the fourth substrate comprises a fourth base substrate, and a plurality of second pixel units on a side of the fourth base substrate close to the second liquid crystal layer, the second pixel units are in one-to-one correspondence with the subpixel regions, and each second pixel unit comprises a first pixel electrode in a corresponding subpixel region.

9. The display module according to claim 5 , wherein the first liquid crystal layer and the second liquid crystal layer are each made of a material comprising cholesteric liquid crystal molecules and a chiral agent.

10. The display module according to claim 5 , wherein the display module is divided into a plurality of subpixel regions arranged in an array;
the third substrate comprises a third base substrate, and a first common electrode on a side of the third base substrate close to the second liquid crystal layer; and
the fourth substrate comprises a fourth base substrate, and a plurality of second pixel units on a side of the fourth base substrate close to the second liquid crystal layer, the second pixel units are in one-to-one correspondence with the subpixel regions, and each second pixel unit comprises a first pixel electrode in a corresponding subpixel region.

11. The display module according to claim 10 , wherein a base substrate in the second liquid crystal panel close to the first liquid crystal panel, and a base substrate in the first liquid crystal panel close to the second liquid crystal panel, are a same base substrate.

12. The display module according to claim 1 , wherein the display module is divided into a plurality of subpixel regions arranged in an array;
the first substrate comprises a first base substrate, and a second common electrode on a side of the first base substrate close to the second liquid crystal layer; and
the second substrate comprises a second base substrate, and a plurality of first pixel units on a side of the second base substrate close to the second liquid crystal layer, the first pixel units are in one-to-one correspondence with the subpixel regions, and each first pixel unit comprises a second pixel electrode in a corresponding subpixel region.

13. The display module according to claim 1 , wherein the first colored light has a wavelength range of 610 nm to 650 nm; and
the second colored light has a wavelength range of 490 nm to 530 nm.

14. The display module according to claim 1 , wherein the first colored light is red light, and the second colored light is cyan light.

15. A display apparatus, comprising the display module according to claim 1 .

16. A method for driving a display module, wherein the display module comprises a first liquid crystal panel and a light modulation layer, wherein the first liquid crystal panel comprises a first substrate and a second substrate opposite to each other, and a first liquid crystal layer between the first substrate and the second substrate;
the light modulation layer is on a side of the second substrate away from the first substrate, and configured to reflect first colored light; and
liquid crystal in the first liquid crystal layer is configured to present a planar texture state or a focal conic texture state in response to an action of an electric field, wherein the liquid crystal in the first liquid crystal layer presenting the planar texture state reflects second colored light with a color different from a color of the first colored light, while the liquid crystal in the first liquid crystal layer presenting the focal conic texture state transmits light,
wherein the display module is divided into a plurality of subpixel regions arranged in an array;
the first substrate comprises a first base substrate, and a second common electrode on a side of the first base substrate close to the second liquid crystal layer; and
the second substrate comprises a second base substrate, and a plurality of first pixel units on a side of the second base substrate close to the second liquid crystal layer, the first pixel units are in one-to-one correspondence with the subpixel regions, and each first pixel unit comprises a second pixel electrode in a corresponding subpixel region, and
the method comprises controlling liquid crystal in the first liquid crystal layer corresponding to a target subpixel region to present the focal conic texture state, comprising:
providing a first pulse to the second common electrode, and providing a second pulse to a second pixel electrode cor

Assignees

• Hefei Boe Optoelectronics Tech
• Boe Technology Group Co Ltd

Inventors

• Liu Yanni
• Wang Hui
• Xue Yang
• Wang Sheng
• Chen Junsheng

Classifications

• G02F2203/02

  reflective · CPC title

• G02F1/133514

  Colour filters · CPC title

• G02F1/133512 Primary

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

• G02F1/1347

  Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells · CPC title

• G02F1/13718 Primary

  based on a change of the texture state of a cholesteric liquid crystal · CPC title