Co-ordinate addressing of smectic display cells
US4419664A · kind A · utility
34Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1980 |
| Grant date | Dec 6, 1983 |
| Priority date | — |
| Expiry date | Dec 23, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A co-ordinate matrix addressing system is used to address a liquid crystal display cell containing a positive dielectric anisotropy smectic material. For this purpose one or more direct voltage pulses are applied across selected elemental volumes of the display to convert them from a focal-conic scattering state to a homeotropically aligned state. Prior to this all elements are electrically driven into the turbulent scattering state which relaxes into the focal-conic scattering state upon removal of the driving field. The driving field may also take the form of direct voltage pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.