Illumination device and image projection apparatus comprising the device
US6227669A · kind A · utility
64Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1998 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Dec 3, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An image display is illuminated by a light source employing a plurality of low power light emitting devices. The lifetime and light intensity of the light sourceare increased by orders of magnitude. The illumination provided by the light source is made uniform to efficiently utilize the light source and so obtain optimum projection results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.