Twisted nematic color liquid crystal display
US6295113A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1999 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | May 17, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A twisted nematic color liquid crystal display. The liquid crystal display comprises parallel glass substrates covered by a transparent electrode and an alignment film, a twisted nematic liquid crystal between the glass substrates, a retardation layer and polarizers. Between the glass substrates, a liquid crystal unit which forms the liquid crystal has a twist angle about 70 to about 180 about degree while free of an externally applying voltage. A product of anisotropy of refractive index for the twisted nematic liquid crystal .DELTA.n and the thickness d thereof, that is, .DELTA.n.multidot.d, is set in a range between about 1100 .ANG. to about 2000 .ANG.. Without using a passive device such as an external color light source or color filter, a multi-color or full color display is formed by an active controlling method of birefringence of electric field via applying a voltage on the transparent electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.