Liquid crystal drive circuit for driving a liquid crystal display element having scanning and signal electrodes arranged in matrix form
US4769639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Jul 31, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0209
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal drive circuit includes a first buffer circuit for outputting a selection high level segment voltage V0' using a nonselection high level common voltage V1 from a common voltage generator as a reference, and a first operational amplifier for outputting a nonselection high level segment voltage V2' having an inverted voltage level of the selection high level segment voltage. The liquid crystal drive circuit also includes a second buffer circuit for outputting a selection low level segment voltage V5' using a nonselection low level common voltage V4 as a reference, and an operational amplifier for outputting a nonselection low level segment voltage V3' having an inverted voltage level of the nonselection low level segment voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.