Small reflective type liquid crystal projection device
US6637890B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2002 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | May 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a small reflective type liquid crystal projection device, which comprises an X-prism, three PBSs, two dichroic mirrors, at least three totally reflective mirrors, three reflective type liquid crystal plates, and a projection object lens. The present invention uses the X-prism matched with the three PBSs and a newly invented 3D light projection system to combine polarized light beams of the three primary colors into one, hence accomplishing the highest use efficiency and the design of light splitting and combining paths and color separating and combining. The reflective type liquid crystal projection device of the present invention has both the advantages of small volume and reduced cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.