Liquid crystal display drive with voltage translation
US5604510A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 10, 1995 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Jan 10, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The drive voltage (V.sub.DATA -V.sub.REF) across an active matrix liquid crystal display module (24) is reversed on alternate frames or alternate lines by using a fixed voltage level (V.sub.REF) at one side of the LCD module and shifting the level of a base component (V.sub.BASE) on the other side of the module between higher and lower voltage levels that are respectively higher than the fixed reference level and lower than the fixed reference level. All voltages have the same polarity so that polarity shifting of any applied voltage is not required. An intensity level component from a digital to analog converter (40a), controlled by a digital input code (41), is combined with the base component in the same sense in alternate frames, but with the digital input code inverted in alternate frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.