Liquid crystal display circuit
US5218352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1990 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Sep 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display (LCD) circuit comprising a duty changing device for changing the driving duty cycle of an LCD in accordance with a power supply switching command signal, and a bias changing device for changing the display bias voltage produced by a bias producing device to cause the LCD to display information, in accordance with a power supply switching command signal externally supplied to the LCD circuit. Even when electric power to be supplied from plural power supplies to the bias producing device is switched in accordance with the power supply switching command signal, a change in the display contrast of the LCD can be suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.