Polarization illumination device and projector having the same
US5387953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1991 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Dec 23, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13355
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A polarization illumination device and projector having the polarization illumination device are provided. An example of the polarization illumination device comprises an illuminator and a polarized including a polarization splitting surface and a reflecting surface, the splitting surface and the reflecting surface form an inverted V shape. The splitting surface splits part of the light into a transmitted component and a reflected component and directs the former in a first direction and the latter toward the reflecting surface. The reflecting surface reflects a remaining part of the light and directs it toward the splitting surface. The splitting surface splits the remaining part of the light into a transmitted component and a reflected component. The former directed toward a second direction different from the first direction, and the latter is returned to the illuminator. The illuminator modulates a plane of each returned reflected light component and causes each returned reflected component to be incident on the polarizer again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.