Patent ID: 8587507

Claim:
A driving circuit for driving a display panel having a plurality of scan lines, a plurality of data lines spaced apart from the plurality of scan lines but arrayed to cross the plurality of scan lines, and a plurality of capacitive loads formed in respective areas neighboring crossings of the scan lines and the data lines, the driving circuit comprising: a first operational amplifier powered by a first power supply voltage and a second power supply voltage lower than the first power supply voltage, having an output terminal for output of an analog voltage with a direct current voltage component of positive polarity; a second operational amplifier powered by a third power supply voltage and a fourth power supply voltage lower than the third power supply voltage, having an output terminal for out put of an analog voltage with a direct current voltage component of negative polarity; and an output switching circuit for connecting the output terminal of the first operational amplifier to a first data line among the plurality of data lines and connecting the output terminal of the second operational amplifier to a second data line among the plurality of data lines, then interchanging connections so that the output terminal of the first operational amplifier is connected to the second data line and the output terminal of the second operational amplifier is connected to the first data line; wherein the first operational amplifier includes a first parasitic diode having an anode connected to a power line supplying the second power supply voltage and a cathode connected to the output terminal of the first operational amplifier, and a first protective switching circuit for connecting the anode of the first parasitic diode to a first voltage supply line supplying a voltage lower than the second supply voltage when the output switching circuit switches the connection of the output terminal of the first operational amplifier from the first data line to the second data line.