Flat panel display with elliptical diffuser and fiber optic plate
US5594561A · kind A · utility
72Cited by
17References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1993 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Mar 31, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S385/901
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A flat panel liquid crystal display module (34) has its front face adjacent a rear projection screen (40) and is illuminated by a pre-polarized collimated light source (10,14,16,18,22,26). Collimation is provided by either a Fresnel lens or a projection lens having a long focal length. The characteristics of the projection screen (40) provide narrowed vertical viewing angle and a fiber optic face plate (38) between the liquid crystal module (34) and the screen (40) provides sunlight rejection. The arrangement has greatly improved display brightness, with only minimal changes in contrast and color as viewing angle changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.