Liquid crystal device for continuous rotation of selective polarization of monochromatic light
US4579422A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1983 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Jul 12, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/36
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A liquid crystal device for continuous rotation of the selective polarization of monochromatic light is provided by a cholesteric mixture with positive dielectric anisotrophy contained between a pair of glass plates which are conductive on the surface in contact with the mixture and have received a surface treatment to provide planar orientation for the mixture. A voltage is applied between the two glass plates and an input light polarizer is applied to one of the two glass plates. The device preferably uses a cholesteric mixture comprising cholesteryl chloride (31.2%), cholesteryl oleyl carbonate (47.7%) and cholesteryl nonanoate (21.1%) and is advantageously employed in laboratory polarization rotators and colored display units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.