Device for the modulation of the illuminating light of an electro-optic display screen
US4824216A · kind A · utility
22Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Apr 20, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133524
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The device of the invention comprises mainly a liquid crystal screen illuminated by a light source. An electrically controlled modulating device is placed between the source and the screen. Depending on the desired illuminating intensity, the electrical signal will be adapted to the modulating device. The modulating device may comprise essentially a liquid crystal cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.