Projection type picture display apparatus
US6229581A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1998 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | May 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection type picture display apparatus, includes a light source; a polarizing beam splitter capable of reflecting or transmitting an incident light; a decomposing/synthesizing prism assembly capable of receiving a reflected light from the polarizing beam splitter to decompose the incident light into red, green and blue lights, also capable of receiving reflected red, green and blue lights to synthesize these lights so as to produce a synthesized light; a plurality of reflective type liquid crystal displays capable of receiving, modulating and reflecting red, green and blue lights; a projection optical system capable of receiving a picture light passing through the polarizing beam splitter to project an enlarged picture on a screen. In particular, the decomposing/synthesizing prism assembly has a first dichroic mirror reflecting a first color light but transmitting a second and third color lights, and has a second dichroic mirror reflecting the second color light but transmitting the first and third color lights, with the first and second dichroic mirror intersected with each other at a predetermined operable angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.