Liquid crystal display device
US5093741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1990 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | Oct 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13712
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal display device has a birefringence control type liquid crystal display unit including a pair of substrates having electrodes on their first major surfaces and arranged with a predetermined distance therebetween such that the electrodes face each other, a liquid crystal material having a negative dielectric anisotropy, the material being disposed between the substrates, liquid-crystal molecules of the liquid crystal material being aligned vertically such that longitudinal axes of said molecules are inclined at a slight pretilt angle in respect of an axis vertical to the substrates when no voltage is applied to the electrodes, a pair of polarizing plates arranged on second major surfaces of the substrates, and a device circuit for driving the liquid crystal device in a multiplex manner. This device is characterized in that the liquid crystal material has a helical pitch in the state wherein the material is not disposed between the substrates, and the relationships of d.ltoreq.p and 50.ltoreq.f.multidot.d.sup.2 /p are satisfied, where d=the distance (.mu.m) between the substrates, p=the helical pitch of liquid crystal material disposed between the substrates, and f=th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.