Patent ID: 7030865
Filing Date: 2006-04-18
Classification: G09G,H03F,H03K

Abstract:
1. An operational amplifier circuit which drives each of data lines of an electro-optical device having scan lines, the data lines and pixel electrodes which are specified by the scan lines and the data lines, the operational amplifier circuit comprising: a first operational amplifier which drives a data line in a first period in which a voltage level of a counter electrode facing a pixel electrode with an electro-optical material interposed therebetween becomes a first voltage level; a second operational amplifier which drives the data line in a second period in which the voltage level of the counter electrode becomes a second voltage level; and a selection circuit which selects an output of the first operational amplifier and connects the output to the data line in the first period in which the voltage level of the counter electrode becomes the first voltage level, and selects an output of the second operational amplifier and connects the output to the data line in the second period in which the voltage level of the counter electrode becomes the second voltage level, wherein an output of the selection circuit is set to a high impedance state in a given period including a transition timing between the first and second periods.