Rear projection type display apparatus
US7909471B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 2007 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | Sep 22, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/625
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A rear projection type display apparatus, comprises an output unit that modulates a light from a light source to output a projection light; an image formation unit that has one or more optical elements, and that subjects the projection light that is output from the output unit to form an image; a Fresnel screen that displays the projection light that is subjected to form an image; a light detection unit that is disposed at a position on which a reflected light from the Fresnel screen focuses, and that detects rays; and a control unit that controls an output of the projection light by the output unit based on the rays that are detected at the light detection unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.