Projection type video display
US7354159B2 · kind B2 · utility
40Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2005 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Mar 31, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3155
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A shutter device can switch between a state where illuminating light from a lamp of an illuminating device is cut off (referred to as a closing state of the shutter device) and a state where illuminating light passes through (referred to as an opening state of the shutter device). A system control circuit instructs a lamp power source to decrease power supplied to the lamp, when receiving information indicating that the shutter device is in the closing state from the detecting portion. After receiving this instruction, the lamp power source decreases the power supplied to the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.