Rear screen projection with twisted nematic crystals for improved viewing angle
US4911535A · kind A · utility
0Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 9, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | May 9, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133504
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The disclosure relates to a light source positioned behind a liquid crystal display, the output from the liquid crystal being projected onto a projection screen that has random polarization, thereby permitting a wide range of vision. The screen can be a part of the liquid crystal display by providing a frosted surface thereon which permits diffusion of the light emanating from the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.