Super-twisted nematic type liquid crystal display device
US5184237A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1991 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Mar 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal cell display device including a liquid crystal cell comprising a pair of substrates having transparent electrodes and aligning films, a liquid crystal composition with a positive dielectric anisotropy positioned between the substrates, major axes of the liquid crystal molecules being aligned nearly parallel in a plane parallel to the substrate when a field is applied and the liquid crystal molecules being twisted in an angle of 120.degree. to 360.degree. in a direction perpendicular to the substrate; a pair of polarizers positioned on opposite sides of the cell; and one or more birefringent layers positioned between the cell and at least one of the polarizers in which a maximum refractive index directions at a planes contacting the polarizer and the liquid crystal cell, are tilted with respect to a plane parallel to the substrate, angles made between each of the directions and the parallel plane are symmetrical one another with regard to a plane parallel to the substrate when angles made between the substrate and maximum refractive index directions positioned between the contacting planes of the birefringent layers are continuously distributed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.