Liquid crystal image projector system
US4195915A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1978 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | May 5, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13439
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is disclosed a liquid crystal image projector which is suitable for use as an image source in an aircraft head-up display system. In this application, the projector provides extremely bright and high contrast symbology for the aircraft pilot. More generally, the projector has application wherever a television-type raster and/or calligraphic symbology display is needed. The increase in brightness and contrast ratio is achieved by using a reflector to concentrate light from a light source onto the liquid crystal display cell from whence it is reflected through an optical aperture stop in the reflector to the projecting lens and thence to a viewing surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.