Liquid crystal device having different natural and induced twists
US4779958A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | Jun 19, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1397
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a liquid crystal device, liquid crystal molecules are twisted at a predetermined angle .theta. within the range of 180.degree. to 360.degree. between a pair of substances. Molecular alignment films are formed on the inner surfaces of the pair of substrates such that an angle .alpha. between the axes of the adjacent liquid crystal molecules falls within the range of 0.degree. to 40.degree.. A liquid crystal composition having a twist abilities falling within the range of .theta.-(2500/.theta.)+.sqroot..alpha. (degrees) to .theta.-(12500/.theta.)+.sqroot..alpha. (degrees) is filled between the substrates, thereby eliminating a memory phenomenon and alignment defects such as reverse twisting alignment defects and at the same time improving multiplexing drive characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.