Efficient optical system for a high resolution projection display employing reflection light valves
US5786873A · kind A · utility
17Cited by
15References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1997 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Aug 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display. The system includes a quarter wave plate positioned to suppress stray reflection from the projection lens. The system also includes a second quarter wave plate disposed on the screen and a polarizing film disposed on the second quarter wave plate to suppress ambient light from illuminating the screen and entering the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.