Development of a Reflective Mode Liquid Crystal Light Valve.
Abstract
The development of a reflective mode liquid crystal light valve suitable for large screen dynamic symbology projection display is described. The device was designed to retrofit into the OSG, OA-8393(V)/UYZ-4 large screen display system developed by the Navy. The light valve consists of a sandwich structure of a thin film photoconductor, light blocking layer, broad visible spectrum dielectric mirror and liquid crystal sandwiched between two glass electrodes with transparent conductive electrodes. There are no matrix elements to define resolution because of the insulating characteristics of the dielectric mirror it is necessary to use ac voltages to operate the light valve. In operation the CdS photoconductor, as a high resolution imaging light activated voltage gate for the liquid crystal. The light blocking layer and dielectric mirror serve to reflect the projection light and prevent this light from reaching the visible sensitive photoconductor.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1975
- Accession Number
- ADA010553
Entities
People
- A. D. Jacobson
Organizations
- HRL Laboratories