Electrically controlled fluorescent liquid crystal light valve and display device thereof

Patent metadata

Field	Value
Publication number	US-9465272-B2
Application number	US-201414572736-A
Country	US
Kind code	B2
Filing date	Dec 16, 2014
Priority date	Dec 1, 2014
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

The present disclosure relates to an electrically controlled fluorescent liquid crystal light valve and a display device thereof. The electrically controlled fluorescent liquid crystal light valve comprises a liquid crystal cell, a disubstituted phenylethylene photoluminescent material miscible with the liquid crystal molecules in the liquid crystal cell, and a control circuit for controlling the liquid crystal cell. By virtue of the electrically controlled fluorescent liquid crystal light valve and display device thereof according to the present disclosure, the disubstituted phenylethylene photoluminescent material used therein, as compared to a conventional liquid crystal light valve that uses a cyan-substituted-diphenylethylene photoluminescent material, has a better molecule planarity and a greater electron delocalization, which excites fluorescence more easily, exhibits more luminous efficiency and can effect a higher contrast; moreover, the disubstituted phenylethylene photoluminescent material used in the electrically controlled fluorescent liquid crystal light valve of the present disclosure has a fine compatibility with liquid crystal molecules, for which only a blending with the liquid crystal molecules is required before they can become homogenous, where the manufacturing process is simple.

First claim

The invention claimed is:

1. An electrically controlled fluorescent liquid crystal light valve comprising a liquid crystal cell, a disubstituted phenylethylene photoluminescent material miscible with the liquid crystal molecules in the liquid crystal cell, and a control circuit for controlling the liquid crystal cell;
wherein the disubstituted phenylethylene photoluminescent material has a structural formula of:

wherein R is C 4 -C 12 straight-chain alkanes.

2. The electrically controlled fluorescent liquid crystal light valve of claim 1 , wherein when light of a certain wavelength is radiated onto the liquid crystal cell comprising the disubstituted phenylethylene photoluminescent material, it can excite the disubstituted phenylethylene photoluminescent material to emit fluorescent light.

3. The electrically controlled fluorescent liquid crystal light valve of claim 2 , wherein the control circuit controls the liquid crystal cell such that the liquid crystal cell is in a transparent state or a scattering state or any state between the two, or is switched between these states.

4. The electrically controlled fluorescent liquid crystal light valve of claim 3 , wherein the disubstituted phenylethylene photoluminescent material and the liquid crystal molecules have intermolecular forces.

5. The electrically controlled fluorescent liquid crystal light valve of claim 4 , wherein the disubstituted phenylethylene photoluminescent material and the liquid crystal molecules have a guest-host effect.

6. The electrically controlled fluorescent liquid crystal light valve of claim 1 , wherein the liquid crystal cell further comprises: a first transparent substrate; a second transparent substrate; an upper electrode formed on the first transparent substrate; a lower electrode formed on the second transparent substrate; a liquid crystal layer located between the first transparent substrate and the second transparent substrate and comprising the liquid crystal molecules; a polymer network, wherein the liquid crystal molecules are dispersed in the polymer network; a first planar orientation layer disposed between the first transparent substrate and the liquid crystal layer; a second planar orientation layer disposed between the liquid crystal layer and the second transparent substrate, the first planar orientation layer and the second planar orientation layer being mutually opposite parallel planar orientation layers, and the liquid crystal layer further comprising a chiral agent and a photoinitiator, the liquid crystal molecules comprising nematic-phase liquid crystal molecules.

7. The electrically controlled fluorescent liquid crystal light valve of claim 6 , wherein the control circuit controls a voltage applied to the liquid crystal cell; as the voltage increases, the fluorescent light intensity and the contrast of the liquid crystal cell both decreases, and when the voltage arrives at a saturation value, the fluorescent light intensity and the contrast of the liquid crystal cell remain constant.

8. The electrically controlled fluorescent liquid crystal light valve of claim 6 , wherein the first transparent substrate is a color filter substrate and the second transparent substrate is an array substrate, or the first transparent substrate is an array substrate and the second transparent substrate is a color filter substrate.

9. A display device comprising the electrically controlled fluorescent liquid crystal light valve of claim 1 .

10. The display device of claim 9 , wherein the liquid crystal cell further comprises:
a first transparent substrate;
a second transparent substrate;
an upper electrode formed on the first transparent substrate;
a lower electrode formed on the second transparent substrate;
a liquid crystal layer located between the first transparent substrate and the second transparent substrate and comprising the liquid crystal molecules;
a polymer network, wherein the liquid crystal molecules are dispersed in the polymer network;
a first planar orientation layer disposed between the first transparent substrate and the liquid crystal layer;
a second planar orientation layer disposed between the liquid crystal layer and the second transparent substrate, the first planar orientation layer and the second planar orientation layer being mutually opposite parallel planar orientation layers, and the liquid crystal layer further comprising a chiral agent and a photoinitiator, the liquid crystal molecules comprising nematic-phase liquid crystal molecules.

11. An electrically controlled fluorescent liquid crystal light valve comprising a liquid crystal cell, a disubstituted phenylethylene photoluminescent material miscible with the liquid crystal molecules in the liquid crystal cell, and a control circuit for controlling the liquid crystal cell;
wherein the liquid crystal cell further comprises: a first transparent substrate; a second transparent substrate; an upper electrode formed on the first transparent substrate; a lower electrode formed on the second transparent substrate; a liquid crystal layer located between the first transparent substrate and the second transparent substrate and comprising the liquid crystal molecules; a polymer network, wherein the liquid crystal molecules are dispersed in the polymer network; a first planar orientation layer disposed between the first transparent substrate and the liquid crystal layer; a second planar orientation layer disposed between the liquid crystal layer and the second transparent substrate, the first planar orientation layer and the second planar orientation layer being mutually opposite parallel planar orientation layers, and the liquid crystal layer further comprising a chiral agent and a photoinitiator, the liquid crystal molecules comprising nematic-phase liquid crystal molecules.

12. The electrically controlled fluorescent liquid crystal light valve of claim 11 , wherein when light of a certain wavelength is radiated onto the liquid crystal cell comprising the disubstituted phenylethylene photoluminescent material, it can excite the disubstituted phenylethylene photoluminescent material to emit fluorescent light.

13. The electrically controlled fluorescent liquid crystal light valve of claim 12 , wherein the control circuit controls the liquid crystal cell such that the liquid crystal cell is in a transparent state or a scattering state or any state between the two, or is switched between these states.

14. The electrically controlled fluorescent liquid crystal light valve of claim 13 , wherein the disubstituted phenylethylene photoluminescent material and the liquid crystal molecules have intermolecular forces.

15. The electrically controlled fluorescent liquid crystal light valve of claim 14 , wherein the disubstituted phenylethylene photoluminescent material and the liquid crystal molecules have a guest-host effect.

16. The electrically controlled fluorescent liquid crystal light valve of claim 11 , wherein the disubstituted phenylethylene photoluminescent material has a structural formula of:

wherein R is C 4 -C 12 straight-chain alkanes.

17. The electrically controlled fluorescent liquid crystal light valve of claim 11 , wherein the control circuit controls a voltage applied to the liquid crystal cell; as the voltage increases, the fluorescent light intensity and the contrast of the liquid crystal cell both d

Assignees

• Boe Technology Group Co Ltd
• Heifei Xinsheng Optoelectronics Tech Co Ltd
• Hefei Xinsheng Optoelectronics Technology Co Ltd

Inventors

• Zhang Guiyu
• Hu Ming
• Xie Taofeng

Classifications

• G02F1/13762 Primary

  containing luminescent or electroluminescent additives · CPC title

• C09K2211/1007

  Non-condensed systems · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• C09K19/54

  Additives having no specific mesophase {characterised by their chemical composition} · CPC title

• G02F2202/02

  organic material · CPC title