Patent ID: 7609256

Claim:
A power supply circuit which supplies voltage to a common electrode which is opposite to a pixel electrode, an electro-optical substance being interposed between the common electrode and the pixel electrode, the power supply circuit comprising: a first voltage generation circuit which generates a first voltage supplied to the common electrode; a second voltage generation circuit which generates a second voltage supplied to the common electrode, the second voltage being lower than the first voltage; and a switch circuit which alternately supplies the first voltage and the second voltage to the common electrode as a common electrode voltage, wherein the power supply circuit performs supply capability control of the common electrode voltage which changes at least one of current drive capability of the first voltage generation circuit, an output voltage level of the first voltage generation circuit, current drive capability of the second voltage generation circuit, and an output voltage level of the second voltage generation circuit according to a total value generated based on grayscale data for the number of dots of one scan line, each dot corresponding to voltage applied to the pixel electrode; and wherein the total value is a value obtained by adding at least part of converted values obtained by converting each piece of the grayscale data for the number of dots of one scan line according to a given grayscale characteristic.