Patent ID: 7477271

Claim:
A data driver that drives a plurality of data lines of an electro-optical device including a plurality of scan lines and the plurality of data lines based on gray scale data, comprising: a gamma correction resistor that divides a voltage with resistance between a first power source voltage and a second power source voltage in order to generate a divided voltage and outputs the divided voltage to a resistance division node as a gray scale voltage; a gray scale voltage signal line to which the gray scale voltage is supplied; a gray scale voltage supply switch provided between the resistance division node and the gray scale voltage signal line; a first operational amplifier that drives a first data line of the plurality of data lines and that comprises a first input that electrically coupled with the gray scale voltage signal line; a second operational amplifier that drives a second data line of the plurality of data lines and that comprises a second input that is electrically coupled with the gray scale voltage signal line; a first bypass switch provided between the input and an output of the first operational amplifier by bypassing the first operational amplifier; and a second bypass switch provided between the input of the second operational amplifier and an output of the second operational amplifier by bypassing the second operational amplifier, wherein: the gray scale voltage supply switch is set to a conductive state and the first and second bypass switches are set to a cut-off state to drive the first data line by the first operational amplifier and to drive the second data line by the second operational amplifier based on the gray scale voltage during a first period of a drive period; and the gray scale voltage supply switch is set to a cut-off state, the first and second bypass switches are set to a conductive state, and outputs of the first and second operational amplifiers are set to a high-impedance state, so as to electrically couple the first data line and the second data line via the gray scale voltage signal line, the first bypass switch and the second bypass switch during a second period succeeding the first period of the drive period.