Image projection system with a polarizing beam splitter
US7306338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2005 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Oct 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/2073
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image projection system has a wire grid polarizing beam splitter which functions as both the polarizer and the analyzer in the system. A light source produces a source light beam directed at the beam splitter which reflects one polarization and transmits the other. A liquid crystal array is disposed in either the reflected or transmitted beam. The array modulates the polarization of the beam, encoding image information thereon, and directs the modulated beam back to the beam splitter. The beam splitter again reflects one polarization and transmits the other so that the encoded image is either reflected or transmitted to a screen. The wire grid polarizing beam splitter is capable of being oriented at various incident angles with respect to the source light beam and modulated beam, and accepts relatively divergent light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.