Rear-projection screen for projection video display system, method of rear-projection collimation and projection video display system incorporating the same
US7724432B2 · kind B2 · utility
1Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2007 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Mar 29, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/625
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Various embodiments of a rear-projection screen, a method of rear-projection collimation and a projection video display (PVD) system. In one embodiment, a rear-projection screen includes: (1) a total-internal-reflection (TIR) fresnel lens configured to aim light received at an incidence angle toward a central axis of the TIR fresnel lens at a convergence angle and (2) a refractive fresnel lens configured to refract the light received from the TIR fresnel lens and at least to reduce the convergence angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.