| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor integrated circuit for liquid crystal display drive, capable of improving display image quality by preventing the output of a positive-polarity amplifier and the output of a negative-polarity amplifier for AC-driving of a liquid crystal panel from becoming unbalanced, or the noise from one amplifier from propagating to the other amplifier. SOLUTION: A drive circuit (110), which generates and outputs a drive signal to be applied to a signal line of the liquid crystal panel, is provided with a decoder circuit (112) which selects a gradation voltage corresponding to display data. Further, the semiconductor integrated circuit is provided with the positive-polarity amplifier which impedance-converts a positive-polarity voltage selected by the decoder circuit and the negative-polarity amplifier which impedance-converts the negative-polarity voltage selected by the decoder circuit. Furthermore, an AC conversion section (115), comprising a switch circuit replacing and transmitting the outputs of the positive-polarity amplifier and negative-polarity amplifier between adjacent output terminals, is provided. Then two source voltages, having identical potential difference, are generated as the source voltage for the positive-polarity amplifier and negative-polarity amplifier, and are supplied through different power lines. COPYRIGHT: (C)2007,JPO&INPIT
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