Drive voltage generating circuit having a contrast control function
US5498932A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Aug 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A drive voltage generating circuit outputs drive signals having voltage levels which is controlled by a second control signal is disclosed. A drive voltage generating circuit according to the present invention comprises drive output terminals for outputting drive signals having voltage levels, a bias circuit having a first voltage terminal to be applied to a first voltage and a second voltage terminal to be applied to a second voltage. The bias circuit produces voltage signals having the drive voltage levels. A drive voltage generating circuit according to the present invention further comprises a switching circuit having input terminals coupled to the bias circuit, output terminals coupled to the drive output terminals and a control terminal receiving a first control signal, a bias potential control circuit coupled between the second voltage terminal and a third voltage terminal to be applied to a third voltage. The bias potential control circuit includes a first voltage control circuit controlling a resistance value between the second and third voltage terminals in response to contrast data signals and a second voltage control circuit controlling the resistance value between the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.