Ferroelectric liquid crystal device
US5227904A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1991 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Jul 12, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133734
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A ferroelectric liquid crystal device includes a pair of substrates which has electrodes formed in an opposing spatial relation to each other. At least one of the electrodes is optically transparent. A parallel aligned, obliquely evaporated film is formed on each electrode. The paired substrates are sealed to provide a cell. A ferroelectric liquid crystal composition to which an ionic substance having a great mobility is added is placed in the cell to obtain the liquid crystal device. The addition of the ionic substance results in a low switching threshold voltage, a high response speed and good memory reproducibility. When the device is applied with an AC electric field prior to driving, display contrast is significantly improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.