Electrothermal matrix addressable liquid crystal display
US4472026A · kind A · utility
18Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1982 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | May 6, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1391
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A row and column matrix of strip electrodes is utilized for switching bistable liquid crystal display cells from the vertical state to the horizontal state via resistive heating by applying an electric current of sufficient magnitude and duration to selected electrodes. Resistive heating causes the liquid crystal to undergo a phase transition from the nematic mesophase to an isotropic phase. Extinction of the current permits the liquid crystal to cool preferentially into the horizontal state of the nematic mesophase. Horizontal-to-vertical state switching is performed by conventional electric field effect techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.