Polymer dispersed liquid crystal for wide viewing angle
US5401437A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1993 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Aug 27, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The polymer dispersed liquid crystal according to the present invention comprises about 5 to about 40% by weight of liquid crystal mixture and about 60 to about 95% by weight of polymer, the polymer consisting of 1 to 40% by weight of oligomer and monomer having acrylate group(s), and 0.1 to 20% by weight of monomer of the following structural formula similar to the structure of the liquid crystal, and the liquid crystal mixture consisting of 0 to 20% by weight of cholesteric liquid crystal and 50 to 98% by weight of nematic liquid crystal as based on the total weight of the material. ##STR1## The polymer dispersed liquid crystal is capable of providing a wider viewing angle and an improved visual contrast and does not require treatment to orientation. Furthermore, the electrically switched liquid crystal display including it therein makes use of light more efficiently because polarizer is unnecessary any more, and may be produced by a simple process because no orientation (rubbing) treatment is required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.