Optical systems for projection displays
US6461000B1 · kind B1 · utility
228Cited by
7References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A prism (13) for use in a projection system which employs a digital light panel (35) is provided. The prism includes first (19) and second (21) spaced part surfaces which are oriented such that: (a) light from a light source (33) will pass through the spaced apart surfaces to the digital light panel; (b) light from “on” pixels will undergo total internal reflection at the second surface (21) and be directed into the acceptance angle of a projection lens (39); and (c) light from “off” pixels which reflects from the second surface will be directed away from the lens' acceptance angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.