Patent ID: 7006070

Claim:
An operational amplifier circuit which drives each of data lines of an electro-optical device, comprising: scan lines; data lines; and pixel electrodes which are specified by the scan lines and the data lines, an output of the operational amplifier circuit being set to a high impedance state in a given period including a transition between a first period in which a voltage level of a counter electrode becomes a first voltage level and a second period in which the voltage level of the counter electrode becomes a second voltage level, the counter electrode facing a pixel electrode with an electro-optical material interposed therebetween, the operational amplifier circuit including: a first operational amplifier which drives a data line in the first period in which a voltage level of the counter electrode becomes the first voltage level; a second operational amplifier which drives the data line in the second period in which a voltage level of the counter electrode becomes the second voltage level; and a clamp circuit which clamps an output of the operational amplifier circuit in a voltage range which is equal to or wider than a voltage range between a first power source VDD and a second vower source VSS of the operational amplifier circuit, and the clamp circuit including: a first diode which sets the direction advancing from the output of the operational amplifier circuit to a third power source VDD′ as the forward direction; and a second diode which sets the direction advancing from a fourth power source VSS′ to the output of the operational amplifier circuit as the forward direction.