Image display device
US7748854B2 · kind B2 · utility
8Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2006 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Feb 9, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3155
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light-quantity adjusting function of a diaphragm used for light quantity control for improving the contrast of a projected image is controlled to cancel light quantity variation due to variation of the driving power of the light source for increasing the service life. This control keeps the quantity of light coming into a display element at a constant value and achieves both service life extension of the light source and image projection having no brightness fluctuation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.