DAP, LCD Device with a bias voltage
US4411496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1980 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Dec 12, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13306
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid crystal color display device including a liquid crystal display cell having a Fredericksz transition effect, and a driving circuit for the display cell. At least one of the opposed electrodes of the liquid crystal display cell is divided into a plurality of electrode members aligned in a row, while the driving circuit supplies driving voltages to the plurality of electrode members corresponding to sound signals, the driving voltages being supplied sequentially having different levels in the order of alignment of the plurality of electrode members. The display device further includes a circuit for lowering the AC power source voltage to bias voltage or a predetermined low voltage level, the AC power source voltage being supplied to a common electrode member formed by the other opposed electrodes of the liquid crystal display cell the power-source voltage applying a potential difference to the liquid crystal, the potential difference being equal to the difference between the driving voltages and the predetermined low voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.