Blue phase liquid crystal composite material and liquid crystal display containing the same

Patent metadata

Field	Value
Publication number	US-9273248-B2
Application number	US-201314236226-A
Country	US
Kind code	B2
Filing date	Dec 31, 2013
Priority date	Mar 28, 2013
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

This disclosure relates to a blue phase liquid crystal composite material formed by photopolymerization of material components comprising a parent blue phase liquid crystal, a photo-polymerizable monomer, a photoinitiator, and inorganic nanoparticles; and to a liquid crystal display comprising the blue phase liquid crystal composite material. The blue phase liquid crystal composite material has a low driving voltage, no electro-optical hysteresis, and rapid response time to an electric field.

First claim

What is claimed is:

1. A blue phase liquid crystal composite material formed by photopolymerization of material components comprising a parent blue phase liquid crystal, a photo-polymerizable monomer, a photoinitiator, and inorganic nanoparticles, wherein the photo-polymerizable monomer is a non-liquid crystal acrylate monomer, and the non-liquid crystal acrylate monomer is a mixture of mono-functional monomers and multi-functional monomers, wherein the molar ratio of the mono-functional monomers to the multi-functional monomers are 1:1-1:9 in the non-liquid crystal acrylate monomer.

2. The blue phase liquid crystal composite material according to claim 1 , wherein the material components include, based on the total weight of the blue phase liquid crystal composite material:
68.0 wt %-88.95 wt % of the parent blue phase liquid crystal;
10.0 wt %-30.0 wt % of the photo-polymerizable monomer;
1.0 wt %-3.0 wt % of the photoinitiator; and
0.05 wt %-2.0 wt % of the inorganic nanoparticles.

3. The blue phase liquid crystal composite material according to claim 1 , wherein the parent blue phase liquid crystal has a blue phase temperature range of 5.0° C. or above.

4. The blue phase liquid crystal composite material according to claim 1 , wherein the photoinitiator is represented by the formula of:

5. The blue phase liquid crystal composite material according to claim 1 , wherein the mono-functional monomer is TMHA, the multi-functional monomer is BDDA, and the molar ratio thereof is TMHA:BDDA=1:4, wherein TMHA is represented by the following formula:

and BDDA is represented by the following formula:

6. The blue phase liquid crystal composite material according to claim 1 , wherein the inorganic nanoparticles have a particle size of 3 nm-300 nm.

7. The blue phase liquid crystal composite material according to claim 1 , wherein the inorganic nanoparticles have been subject to surface modification.

8. The blue phase liquid crystal composite material according to claim 1 , wherein the inorganic nanoparticles are one or more selected from the group consisting of non-ferroelectric nanoparticles ZnS, ZnO, GdS and GdSe.

9. The blue phase liquid crystal composite material according to claim 1 , wherein the inorganic nanoparticles are one or more selected from the group consisting of ferroelectric nanoparticles BaTiO 3 , Sn 2 P 2 S 6 , LiNbO 3 and PbTiO 3 .

10. A liquid crystal display comprising a blue phase liquid crystal composite material according to claim 1 .

Assignees

• Boe Technology Group Co Ltd

Inventors

• Yang Huai
• Wang Ling
• He Wanli

Classifications

• C09K2019/521

  Inorganic solid particles · CPC title

• C09K2019/546

  creating a polymeric network · CPC title

• C09K19/0275

  Blue phase · CPC title

• C09K19/542 Primary

  Macromolecular compounds · CPC title