Color light combining system for optical projector
US7821713B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2008 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | May 1, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A color light combining system comprises a polarizing beam splitter that includes a reflective polarizer film, a first prism face that receives a first unpolarized color light, a second prism face that receives a second unpolarized color light, and a third prism face that provides a first combined light output that includes combined first color light polarized in a first direction and second color light polarized in a second direction. The polarizing beam splitter includes a reflector at a fourth prism face. A color-selective stacked retardation polarization filter faces the third prism face. The first color selective stacked retardation polarization filter provides a second combined light output that includes the first and second color lights that are combined and have the same polarization direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.