Display system with equal path lengths
US4864390A · kind A · utility
134Cited by
11References
82Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Dec 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1313
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Display systems useful for projection video and television systems are provided to perform with high efficiency and good color rendition. In these systems, color may be provided, as one example, by various light valves, such as liquid crystal displays. Each of the liquid crystal displays are positioned at equal path distances from an illuminating subsystem, and have equal path distances from the light valves to a projection subsystem. This enables optimum illumination of each of the light valves. Various embodiments of arranging the light valves, as well as providing illumination are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.