DAP type liquid crystal device with cholesteric liquid crystal birefringent layer
US5243451A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1993 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Jan 5, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1393
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed herein is a DAP type-ECB system liquid crystal display device comprising (1) a liquid crystal cell in which a liquid crystal layer is sandwiched between a pair of substrates each having at least one electrode, (2) a birefringent layer sandwiched between a substrate and the liquid crystal cell and (3) a pair of polarizers disposed on outer surfaces of the substrates. The birefringent layer comprises a liquid crystal compound showing a cholesteric liquid crystal phase or a polymer film obtained by quenching a polymer showing a cholesteric phase to fix the aligning direction of the polymer molecules, and refractive indexes n.sub.x, n.sub.y within a plane of the birefringent layer and the refractive index n.sub.z in the direction perpendicular to the plane have a relationship: EQU n.sub.x =n.sub.y >n.sub.z.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.