Contrast enhancement for liquid crystal based projection systems
US7518662B2 · kind B2 · utility
26Cited by
13References
25Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 11, 2006 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Apr 9, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B33/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Described are tilted compensators for compensating for in-plate and out-of-plane retardances of LC panels in their dark states, including a single tilted biaxial retarder or compound retarder comprising more than one biaxial film, which are effective to compensate both for nonideal polarization effects of LC panels and other optical components in optical projection systems. Also described are tilted compensators for deflecting away from a projection system optical path unwanted reflected light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.