Device for reducing output deviation in liquid crystal display d

Details Device for reducing output deviation in liquid crystal display d Device for reducing output deviation in liquid crystal display d

1998-05-26

2000-08-15

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

G09G 336

Patent

active

061043648

ABSTRACT:
In a liquid crystal display driving device, a compare circuit compares input pixel data with pixel data delayed by a clock cycle and generates a discrimination signal indicative of whether or not the input pixel data is coincident with the delayed pixel data. A liquid crystal display driving circuit receives the input pixel data and includes output amplifiers for outputting parallel driving signals to output terminals connected to a liquid crystal display. A group of switches are connected between the output amplifiers and the output terminals. The switches are controlled by a switch control circuit based on the discrimination signal in such a manner that when the discrimination signal indicates that the input pixel data is coincident with the one-clock-delayed pixel data, the output terminal corresponding to the one-clock-delayed pixel data is short circuited to the output terminal corresponding to the delayed pixel data, so that the driving signals supplied to the two output terminals are equalized to reduce an output deviation in the driving signals supplied to the liquid crystal display.

REFERENCES:
patent: 5483256 (1996-01-01), Ohi
patent: 5604511 (1997-02-01), Ohi
patent: 5682175 (1997-10-01), Kitamura
patent: 5734366 (1998-03-01), Kubota et al.
patent: 5748167 (1998-05-01), Watanabe et al.

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