Polarized light illumination device and projector
US6132047A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1999 |
| Grant date | Oct 17, 2000 |
| Priority date | — |
| Expiry date | Aug 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3167
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a polarized light illumination apparatus, randomly polarized lights emitted from first and second light sources are respectively separated by a polarized light separating optical element into two different types of polarized light thereby producing three types of polarized light which are polarized in directions perpendicular to one another. The polarized lights are partially returned to the light sources and their polarization directions are rotated. Secondary light source images are formed at locations shifted in an x direction whereby polarization is aligned in the same single direction. Thus, even though a plurality of light sources are used, the polarized light illumination apparatus can emit illumination light using both polarized components without causing an increase in the illumination angle. Furthermore, a projector capable of projecting an image with a very high brightness can be realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.