Polarization luminaire and projection display
US6147802A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1997 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Feb 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13362
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A polarization luminaire of the present invention has a light source, an optical integrator, a polarized light splitting means and a polarization conversion means. The polarized light splitting means splits a light emitted from the light source into two kinds of polarized lights. The polarization directions of the two kinds of polarized lights are perpendicular to each other and travel in directions separated by an angle of less than 90 degrees. The polarization conversion means modifies the two kinds of polarized lights to have the same polarization direction. The polarized light splitting means is placed on the entrance side or the outputting side of a first lens plate of the optical integrator, or is placed within a second lens plate. A prism beam splitter having a polarized light splitting film that includes a thermally stable dielectric multi-layer film may be used as the polarized light splitting means. The present invention utilizes most of the polarized lights by causing the polarized lights to have the same polarization direction. Further, uniform brightness is emitted. Consequently, the polarization luminaire of the present invention is suited for use in a projection disp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.