Optical modulation device using ferroelectric liquid crystal and AC and DC driving voltages
US4773738A · kind A · utility
46Cited by
6References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1987 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Aug 25, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0209
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical modulation device includes: a ferroelectric liquid crystal disposed between a pair of substrates; provision for applying an alternating voltage sufficient to render the ferroelectric liquid crystal turbid; and provision for superposing a DC voltage on the alternating voltage. A portion of the ferroelectric liquid crystal rendered turbid through the application of an alternating voltage is selectively caused to have an increased transmittance when superposed with a DC voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.