Projection display apparatus and method
US8033669B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2007 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Aug 2, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Not only abnormality of a light output to an exterior but also overturning, vibration, disassembly, deformation, or breakage of a display apparatus including a case and a screen are reliably and promptly detected. A projection display apparatus includes a light source (22) for generating illumination light, which is provided in a case (28) having a light-shielding function, a movable aperture (23) for adjusting the amount of illumination light from the light source (22), a light valve (9) for adjusting the amount of light based on an image signal to generate image light for forming an image from the illumination light, a projection optical system (10) for enlarging the image light from the light valve (9), and a transmission-type screen (29) for displaying the image, which is provided to a window of the case (28). The projection display apparatus further includes first to ninth detectors (41 to 49) for detecting the abnormality of the light output of the light source (22) to the exterior and the abnormality of the case (28) or the transmission-type screen (29), a warning and alarm unit (30) for notifying the abnormality by sound or light, and a control unit (32) for controlling an …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.