Method and apparatus for multi color display
US4770500A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1986 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Jun 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1393
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus and method for producing a color display from a substantially monochromatic source utilizes a liquid crystal cell combination together with a plechroic filter to differentially polarize the light components comprising the light emitted from the source. The liquid crystal cells are connected in push-pull fashion to individually retard light by one fourth of a wave as a function of the control signal applied to them. A fourth wave plate followed by a linear polarizer completes the optical combination. A signal at a first level applied to the cells causes transmission of one component color and blocks the other. A signal at a second level blocks the one component color and transmits the other. An intermediate level signal transmits both colors, resulting in a third, combination color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.