| 摘要 |
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.
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