High definition video-rate laser-addressed liquid-crystal light-valve projection display
US4992880A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 1989 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | May 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B9/323
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high definition, video-rate laser-addressed liquid-crystal light-valve projection display provides for real-time applications to large-area projection displays. A laser raster scanner uses acousto-optic components to modulate and deflect the laser beam. An acoustic optical, acoustic traveling wave lens is included to increase the optical resolution of the scanner system. A liquid-crystal light-valve spatially is modulated by a high resolution coherent beam to responsibly modulate a high intensity light coming from an arc lamp source. The modulated high intensity light is reflected from the liquid-crystal light-valve and is projected onto a large screen. The use of acousto-optic Bragg cells to modulate, horizontally track, horizontally chirp and vertically impart a beam of coherent light allows a projection of a 1075-line RS-343A high definition or resolution TV standard image on the screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.