Driver for liquid crystal display apparatus with no operational

Details Driver for liquid crystal display apparatus with no operational Driver for liquid crystal display apparatus with no operational

1998-07-28

2000-10-03

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345100, G09G 300

Patent

active

061279978

ABSTRACT:
In a driver in a liquid crystal display apparatus for receiving an input voltage and generating an output voltage to drive a data line, first and second MOS transistors of the same conductivity type have a common gate connected to a drain of the first MOS transistor. A source of the second MOS transistor is connected to an output terminal for generating the output voltage. A first switch is connected between an input terminal for receiving the input voltage and a source of the first MOS transistor, a second switch is connected between a first power supply terminal and the drain of the first MOS transistor, a third switch is connected between the first power supply terminal and a drain of the second MOS transistor, and a fourth switch is connected between a second power supply terminal and the output terminal. The first and second switches are operated to bias a voltage at the gate of the second MOS transistor to a voltage shifted from the gradation voltage by a threshold voltage of the first MOS transistor. The third and fourth switches are operated to operate the second MOS transistor as a source follower.

REFERENCES:
patent: 5680149 (1997-10-01), Koyama et al.
patent: 5686935 (1997-11-01), Weisbrod
patent: 5739805 (1998-04-01), Dingwall
S. Saito et al. "A 6-bit Digital Data Driver for Color TFT-LCDs", SID 95 Digest, 1995, pp. 257-260.

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