MOS light valve with nematic liquid crystal operating in the surface mode
US5245455A · kind A · utility
10Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1990 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | Sep 10, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/135
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light valve (10) includes a layer of a liquid crystal (16), a MOS substrate structure (18) with a dielectric layer (24) and a semiconductor layer (26), and an optically isolating mirror (14) between the liquid crystal layer (16) and the substrate structure (18). An external AC biasing voltage is applied across the MOS substrate (18) and the liquid crystal layer (16). The liquid crystal layer (16) is sufficiently thick that it operates in the surface birefringent mode with a high contrast ratio and a short response time to changes in the write-in light beam, when a sufficiently high biasing voltage V.sub.p is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.