LCD contrast adjustment system
US5029982A · kind A · utility
207Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1989 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Sep 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for maintaining the contrast of an LCD at a constant level despite variations in temperature of the liquid crystal medium includes a temperature sensor and digital circuitry for generating a correction voltage that offsets the change in contrast level caused by the change in operating temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.