Circuit for driving a liquid crystal display panel
US5157386A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1990 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Mar 28, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for driving an active matrix liquid crystal display having M rows and N columns by video digital data of K bits is provided. The rows and columns intersect at a plurality of thin film transistors which form at least in part a pixel at each intersection of a column and row. An analog switch capable of ON and OFF state receives a video voltage and a control signal and selectively outputs the video voltage to each column in response to a control signal. The video voltage varies in level sequentially increasing from the OFF state at least once each horizontal scanning period. A control receives the K bit digital input data and produces a control signal for controlling the time of the ON state of the analog switch in response to the input data. K is an integer at least equal to 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.