Optical device for projection display system
US6382798B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 2000 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Apr 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical device for projection display system comprising:a LCD projector, a luminescent spot projector for forming a luminescent spot on a screen, a luminescent spot extracting means for extracting light from the luminescent spot out of a reflected light from the screen,a luminescent spot detecting means for detecting the reflected luminescent spot and a luminescent control means for controlling a display image forming operation of the LCD projector based on the detection signalwherein the luminescent spot extracting means is an holographic mirror optically processed at, at least one wavelength of the luminescent spot projector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.