Method for addressing each column of a matrix type LCD panel
US5319381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1993 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Apr 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0204
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a method for the addressing of each column of a matrix type LCD panel consisting in the production of a pulse to control a driver transistor of said column, said pulse having a duration determined by the value of the video signal sample at input, said pulse acting on the conduction state of said transistor to connect said column to a supply terminal where a voltage gradient develops. According to the method two pulse durations, the sum of which is predetermined, are alternated and, in order that a given value of a video signal sample may produce the same optical effect from one period to the next one, differentiated excitation voltages are applied to at least one of the electrodes sandwiching the liquid crystal layer, namely said column and its counter-electrode. Application notably to active matrix LCD panels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.