Patent ID: 6411162
Filing Date: 2002-06-25
Classification: G09G,H03F

Abstract:
An amplifier device driving a capacitive load, comprising:a voltage-current conversion device comprising an amplifier stage amplifying an input signal voltage and a voltage-current conversion stage outputting a current corresponding to a first polarity output voltage of the amplifier stage; a current-voltage conversion device comprising a semiconductor element and a constant current source which are connected in series to each other, a current corresponding to the first polarity output voltage of the amplifier stage being supplied to a connection node between the semiconductor element and the constant current source, and the current-voltage conversion device outputting a voltage corresponding to the current supplied to the connection node from the voltage-current conversion device; a first output semiconductor element controlling a discharging operation to discharge electrical charges from the capacitive load based on the voltage output from the current-voltage conversion device according to the current corresponding to the first polarity output voltage of the amplifier stage; and a second output semiconductor element controlling a charging operation to supply electrical charges to the capacitive load based on a second polarity output voltage, which is different from the first polarity output voltage, of the amplifier stage.