Smectic liquid crystal display cell
US4196974A · kind A · utility
29Cited by
8References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1977 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Nov 29, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2019/122
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention provides a liquid crystal display cell in which particles having a preferential light absorption direction, particles which may be the molecules of a dichroic pigment, are inserted in the body of a layer of a mesomorphic material in a smectic state. The write-in can be made by a thermo-optical process. The molecular orientation of the smectic material controls the particles orientation, so that the variation in the light scattering coefficient commonly used with smectic layers are replaced by variations in the absorption coefficient, easier to use and provide a better contrast.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.