Light addressed liquid crystal light valve incorporating electrically insulating light blocking material of a-SiGe:H
US5084777A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1991 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Apr 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1351
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved light addressed liquid crystal light valve incorporating electrically insulating light blocking material is disclosed. The light valve has a hydrogenated amorphous silicon photosensitive layer and a germanium containing or tin containing alloy film as a light blocking layer. The light blocking layer that may be used is a selected alloy which includes one or more elements from the group consisting of germanium and tin, one or more elements from the group consisting of hydrogen, nitrogen and oxygen, and zero or more elements from the group consisting of silicon and carbon. The light blocking layer has an optical density per unit thickness approximately equal to or greater than 3 OD/micron for visible light and a sheet resistivity approximately equal to or greater than 10.sup.10 ohms/square.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.