Rear projection type image display device
US7342724B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2007 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Feb 12, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a rear projection type image display device comprising projection lenses (2, 3) for projecting an image displayed on an image display element onto a transmission type screen (6) on a larger scale, an optical path turn-back mirror (7) for turning back halfway a light beam projected from the projection lenses, and a drive circuit for displaying an image on the image display element, that are fixedly housed within a housing (5). When a diagonal size of the transmission type screen (6), the depth of the housing (5), and the length from a lower end of the screen (6) to a lower end of the housing (5), are assumed to be SS (inch), D (inch), and L (inch), respectively, the following conditions are satisfied:SS>40, D≦SS/3.0, L≦SS/10.9.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.