Electrooptical liquid crystal system
US5376302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1993 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Apr 6, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to an electrooptical liquid crystal system PA1 which between two electrode layers there is contained a liquid crystal mixture and a further optically transparent polymer medium, PA1 whose liquid crystal molecules have irregular orientation in the switched-off state, PA1 in which one of the refractive indices of the liquid crystal mixture is substantially the same as the refractive index of the medium n.sub.m and/or in which the quotient from the weight of the liquid crystal mixture and the weight of the optically transparent medium is 1.5 or more, PA1 which in one of the switching states has reduced transmission compared with the other state essentially independent of the polarization of the incident light, and PA1 whose liquid crystal mixture contains at least one dielectrically neutral and at least one dielectrically positive liquid crystalline or monotropic compound, characterized in that the liquid crystalline mixture contains less than 15% by weight of one or more dielectrically positive liquid crystalline, enantiotropic or monotropic, two-ring compounds in order to lower the solubility of the liquid crystal mixture in the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.