Polarized light illumination device
US7180666B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2003 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Dec 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13362
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention concerns a polarized light illumination device comprising in particular: a light source, an optical Fresnel Rhomb polarization device receiving light from the source and reflecting it at least twice on at least two opposite surfaces, a reflective polarizer arranged opposite the output surface of the Fresnel Rhomb polarization device to receive the reflected light so as to allow through linearly polarized light along a first direction and to reflect light having any other type of polarization, a reflecting device arranged between the polarization device and the light source so as to allow through the light but to reflect the light reflected by the reflective polarizer. The invention is applicable to liquid crystal display for illuminating liquid crystal valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.