Real-time ultra-high resolution image projection display using laser-addressed liquid crystal light valve
US4533215A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1982 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Dec 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A more clearly defined image is projected onto a distant screen in real-time at video rates to allow for collective analysis of rapidly changing updated data. A laser has its coherent beam modulated in accordance with the images to be viewed. The modulated light beam is scanned across the surface of a liquid crystal light valve to stimulate a photosensor layer that impresses a replica voltage pattern on the bi-refringent liquid crystal. A high intensity projection light beam is reflected from the liquid crystal via a polarizing biprism and, consequently, is modulated by the bi-refringent liquid crystal so that a corresponding image is displayed on the screen. The controllable small spot diameter of the modulated laser beam is capable of greatly improving the resolution as it scans across the liquid crystal light valve. The hybrid field effect nematic liquid crystal layer, plus a direct creation of replica voltages by the impinging modulated coherent light, gives the system an instantaneous, truly real-time capability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.