Contrast adjustment circuit for liquid crystal display
US5517212A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1994 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Aug 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/36
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A contrast adjustment circuit for a liquid crystal display which is connected, when to be used, to an electronic apparatus such as a computer. The contrast adjustment circuit comprises an adjustment voltage supply circuit provided in an electronic apparatus, a reference voltage generation circuit provided in the liquid crystal display for generating a reference voltage substantially equal in absolute value to a contrast peak voltage of the liquid crystal display, and an operational amplifier for comparing the reference voltage and an adjustment voltage and supplying a voltage difference between the reference voltage and the adjustment voltage to a driving voltage input terminal of the liquid crystal display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.