D/A conversion circuit and semiconductor device
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United States of America Patent
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Aug 10, 2004
Grant Date -
Jun 6, 2002
app pub date -
Dec 28, 2001
filing date -
Aug 16, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A D/A conversion circuit in accordance with the present invention, which is provided with a switch swD, allows a writing operation of a voltage (a true gradation voltage) to be performed at a higher speed by first applying a first voltage (a voltage close to the true gradation voltage), which is supplied without passing through a resistor element, to an output line and then applying a second voltage (the true gradation voltage), which is supplied via the resistor element, to the output line. Thus, the present invention can provide a D/A conversion circuit capable of writing display data to liquid crystal cells with higher precision at higher speed, and a semiconductor device utilizing such a D/A conversion circuit.
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