Single-polarizer reflective bistable twisted nematic (BTN) liquid crystal display device
US8085370B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2006 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Dec 25, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133567
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The application relates to a single-polarizer reflective bistable twisted nematic (BTN) liquid crystal display device comprising a liquid crystal layer of thickness d, birefringence Δn and retardation Δnd, said liquid crystal layer being situated between two substrates and between a polarizer and a reflector, said liquid crystal layer in the absence of an applied electric field having two stable uniformly twisted textures, the twists of the two stable textures differing by an angle being equal mainly to 180°, and at least one compensation layer positioned between said polarizer and said reflector, said compensation layer being composed of at least one birefringent film, said birefringent film having an optical anisotropy defined by three characteristic refractive indices nx, ny, nz, along three corresponding axis x, y, z of index ellipsoid, x and y being situated inside the substrates plane, nx and ny being called in plane indices, with nx≧ny, x being called slow axis, and z being perpendicular to the substrates plane with biaxiality parameter Nz equal to (nx−nz)/(nx−ny), characterized in that Nz lies between −∞ and ½ so that under oblique viewing the retardation of the stable text…
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