Method and apparatus for increasing illuminator brightness in a liquid crystal on silicon (LCoS) based video projection system
US7560710B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2005 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Jun 17, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/315
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Ultra Violet (UV) light produced by a light source is converted to visible light and utilized in a visible light output of the light source. The light source is, for example, a light source in an illuminator of a projection device. UV light that is typically filtered out of the illuminator is converted by a UV absorbing visible light radiating phosphor. The UV light is directed to the phosphor by, for example, reflecting the UV light out of a light path, concentrating the UV light via a concave reflector, and directing the UV light to the phosphor. The re-radiated visible light is then injected back into the light path of the light source. In one embodiment, the re-radiated visible light is injected into a “shadow” of the light path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.