Liquid-crystal display device
US4277145A · kind A · utility
32Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1979 |
| Grant date | Jul 7, 1981 |
| Priority date | — |
| Expiry date | Dec 17, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/135
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a liquid-crystal display device, a smectic liquid-crystal layer and a layer of photoconductive material are placed between two transparent plates. A voltage is applied to the photoconductor by means of electrodes while scanning the photoconductor with a writing light beam. At locations in which the resistance of the photoconductor is reduced under the action of the light beam, the heat generated causes transition of the liquid crystal to the isotropic state. The light-scattering action produced by subsequent cooling of the liquid crystal has the effect of writing the image to be displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.