Reflective type liquid crystal projection system
US6402323B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Sep 1, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/2073
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention proposes a reflective type liquid crystal projection system, which comprises an incident light source providing an S-polarization light beam or a P-polarization light beam as the incident light beam. A polarization of color-splitting device having a first polarization of color splitter and a second polarization of color splitter is used to split the incident light beam of three primary colors into two sets of light beams, which respectively penetrate through or are reflected. The two sets of light beams split by the first polarization of color splitter are reflected by two reflective mirrors, traverse two polarizing plates arranged between the reflective mirrors and the second polarization of color splitter, and are then incident on the second polarization of color splitter. At least a retarder is arranged between the reflective mirrors and the polarization of color-splitting device. The split light beams of three primary colors are assembled into an output light beam by a color-combining device comprising three PBS's. Finally, the output light beam is projected to form the image via a projection lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.