Optical compensator and liquid crystal display
US5337174A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 14, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Apr 14, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is provided a laminate consisting of a first oriented film (1) obtainable by drawing, at least in one direction, a polymer film having a refractive index of n.sub.D .gtoreq.1.60, an Abbe number of .nu..sub.D .gtoreq.30.0 and a glass transition temperature of Tg=60.degree. to 160.degree. C. and a second oriented film (2) obtainable by drawing, at least in one direction, a polymer film having a refractive index of n.sub.D <1.60. The laminate has a retardation value R of 60-1000 nm and a wavelength dispersion value .nu..sub.RF of not less than 1.10. This oriented film either as it is or as laminated with an optically isotropic film at least on one side is used to fabricate an optical compensator for color compensation in a liquid crystal panel. In this manner, there can be obtained a liquid crystal display panel which solves the long-standing problems of coloration and low contrast ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.