Liquid crystal device having variable reflected wavelength
US7710522B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 2000 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Feb 22, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal device comprises a cholesteric liquid crystal material interposed between a transparent front plate and a back plate. The cholesteric liquid crystal material is switchable between a transparent state and a reflective state in response to an electric field applied in a first direction. In the reflective state the material reflects light characterized by a first wavelength when no electric field is applied. Electrodes are provided for applying an electric field lied to the cholesteric liquid crystal material in the reflective state in a second direction distinct from the first direction. In this manner the cholesteric liquid crystal material is altered to cause the material to reflect light characterized by a second wavelength different from the first wavelength. A display device may thus be produced having pixels capable of a wide range of colors, thereby achieving a multicolored image for the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.