Illumination device and method for illuminating uniformly an image generating micro display
US8064114B2 · kind B2 · utility
2Cited by
9References
23Claims
0Family size
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Key dates
| Filing date | Mar 3, 2008 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | Aug 31, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2225/55
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination device for uniformly illuminating an image generating micro-display that includes a coherent light source, a beam shaping and speckle reduction device located on an optical path between said coherent light source and said image generating micro-display, wherein the beam shaping and speckle reduction device includes a dynamic diffractive optical element, and a processor which is configured to control said dynamic diffractive optical element so that a sequence of different hologram patterns is generated on said dynamic diffractive optical element, the different hologram patterns being uncorrelated to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.