Apparatus and method for generating bias voltages for liquid crystal display
US5867057A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1996 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Apr 10, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for generating bias voltages for an LCD driver. A voltage divider including serially connected resistors of a first resistance is arranged to form a DC current path having nodes. The voltage of each node serves as a bias voltage to the LCD driver for actuating the LCD driver to generate LCD driving signals. A signal generator is used to generate a switching signal in synchronism with the LCD driving signals. A switching circuit including switches is arranged so that when the switches are closed, the resistance between two adjacent nodes has a small value, so as to provide large driving currents to the LCD driver, and when the switches are open, the resistance has a large value, so as to reduce the amount of leakage current through the DC current path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.