Deformed helix ferroelectric liquid crystal display device and method of driving
US5490000A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1993 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Dec 3, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display element includes one substrate on which pixel electrodes and TFTs connected to the pixel electrodes are arranged in a matrix form, the other substrate on which a counter electrode opposing the pixel electrodes is formed, and a ferroelectric liquid crystal sealed between the substrates and having a helical pitch smaller than a distance between the substrates. A row driver is connected to the TFTs to sequentially turn on the active elements. A column driver applies an initializing voltage consisting of first and second reset pulses for sequentially setting the ferroelectric liquid crystal in the first and second aligned states and a write voltage changing in accordance with the display gradation levels to the pixel electrodes through the ON active elements, thereby performing gradation display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.