Dual-fresnel field lens for a single-panel LCD projection system
US5940152A · kind A · utility
11Cited by
4References
5Claims
0Family size
Inventors
Key dates
| Filing date | May 1, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | May 1, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A dual-Fresnel field lens liquid crystal display projection system which includes first and second flat Fresnel lenses having their faceted surfaces facing one another and positioned adjacent to one another along the optical axis of the system between a liquid crystal display light modulator and the entrance aperture to a projection lens assembly to form a field lens assembly for the projection system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.