Liquid Crystal Driving Circuit and Liquid Crystal Display Device with the Same
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United States of America Patent
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Issued Date -
Jan 17, 2008
app pub date -
Sep 28, 2005
filing date -
Sep 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
It is an object to reduce the cost and the power consumption in a circuit part for generating a gradation voltage of a liquid crystal driving circuit. A gradation voltage generating circuit (78) is provided with a gradation voltage generating part (88) for generating a plurality of gradation voltage for gradation display by a pixel of a liquid crystal display part; a source-follower connected transistor group (90) for performing impedance conversion on each of the plurality of gradation voltages; and an analog switch part (94) for selecting an output of the transistor group (90) and applying the output to a pixel group of a liquid crystal display part. Furthermore, the transistor group (90) is preferably provided with a current control circuit part (92) for controlling a current that flows in each transistor.
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