Bistable device for reflection display with inverse contrast
US6795146B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Nov 8, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1391
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention concerns a bistable device comprising a liquid crystal material, aligning means, which orient the liquid crystal to provide two stable or metastable textures, means for applying electric signals enabling to switch between the two textures, a polarizer (10) associated with the front surface of the device, placed inside or outside same, a reflective, specular or diffusing element, placed on the rear surface of the liquid crystal, inside or outside the device, allowing light to pass through the device twice and to return towards the observer or towards additional optical elements, and a compensator (20), placed between the polarizer and the reflective element, with an optical retardation dc&Dgr;nc close to &lgr;0/4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.