Rear projection display device and projecting method used for the same
US6805447B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 2001 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Oct 12, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A flat mirror for folding an optical path in a casing of a rear projection television is arranged in the casing on not the side of a screen but a rear or upper side of the casing. In order to direct an optical path of an image projection to a flat mirror on a rear or upper side of the casing, a plurality of focusing mirrors, with which a light beam can be directed at a large angle with respect to a normal line of the screen and can focus an image through a shorter distance compared with a conventional lens system, are used. Since the light beam projected by the focusing mirrors is directed at high angle and reflected by the rear or upper side flat mirror in the casing, the light beam is focused on the screen provided on a front side of the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.