Polarization conversion system
US7237900B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Aug 11, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/136277
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A polarization conversion system suited for LCD or LCoS-based projection applications is disclosed. The present invention polarization conversion system encompasses a light pipe with a rectangular light tunnel therein defined by four side reflection mirrors. A front reflection with an aperture thereon is mounted on an entrance face of the light pipe. A first polarization beam splitter is mounted on an exit face of the light pipe. A retardation plate, which is perpendicular to the exit face, is situated atop the first polarization beam splitter. A reflection mirror is situated atop the retardation plate. A second polarization beam splitter is mounted under the first polarization beam splitter and is opposite to the retardation plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.