Liquid crystal display apparatus
US5404150A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Oct 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/3696
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to improve the contrast of a liquid crystal display device by the voltage equalization method, scanning side electrodes totaling D in number are scanned in line sequential fashion while applying a voltage between each selected scanning side electrode and each signal side electrode, the voltage applied being controlled in such a way that, during a total of D times of scanning of the scanning side electrodes for production of one frame, when a particular scanning side electrode and a particular signal side electrode are simultaneously in a select state, a voltage Vop is applied to the corresponding liquid crystal, and when the scanning side electrodes respectively are in a non-select state, which occurs the remaining (D-1) times for each of the scanning side electrodes, a voltage whose polarity is reversed in response to the select and non-select states of the signal side electrodes and whose absolute value is represented by .vertline.Vop/B.vertline., where B is the bias ratio, is applied to the corresponding liquid crystal. The bias ratio B can be varied to adjust the contrast of the liquid crystal display device, and it is possible to improve the contrast by increasing the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.