Transparent screen and projection display unit
US7605978B2 · kind B2 · utility
2Cited by
2References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2006 |
| Grant date | Oct 20, 2009 |
| Priority date | — |
| Expiry date | Nov 28, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A transparent screen and a projection display unit capable of reducing the speckle with maintaining the brightness of the image light. A wavefront-dividing phase-modulating component 21, which divides the wavefront of the image light emitted from a Fresnel lens screen 7 and modulates the phases of the wavefronts divided, is disposed before an optical diffusing component 10. Alternatively, a spatial frequency modulating component 22, which modulates the spatial frequency of the image light diffused by the optical diffusing component 10, is disposed on the light-output side (observer side) of the optical diffusing component 10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.