Liquid crystal display systems
US4393380A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1980 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | May 28, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0876
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A matrix liquid crystal display circuit operates on a level of AC voltage equal to the voltage required for DC drive. The circuit includes a selecting transistor connected to the picture element and a capacitor for each picture element of the matrix. The capacitor in each row connects to a common electrode and the transistor gates in each row connect to a common electrode. The voltage level of the common capacitor electrode is shifted periodically relative to a reference voltage in order to invert the image signal polarity across the picture element and produce an AC drive. Inverted image signals of similar voltage level are alternately sampled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.