Color filter
US4416514A · kind A · utility
81Cited by
12References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1980 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Nov 10, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1396
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable color filter comprising a plurality of differently colored diochroic polarizers, an equal number of voltage responsive twisted nematic liquid crystal cells, and a plane polarizer all arranged along an optical path in a predetermined manner to modify the spectral content of visible light incident to the filter so that the filter transmits any one of a predetermined number of colors whose saturation and hue are related to the voltages applied to the liquid crystal cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.