Patent ID: 7173614

Claim:
A power supply circuit for supplying voltage to a common electrode which faces a pixel electrode through an electro-optical substance, the power supply circuit comprising: a common electrode voltage supply circuit which supplies one of a first high-potential-side voltage, a first low-potential-side voltage, a second high-potential-side voltage, and a first intermediate voltage to the common electrode based on a select signal, the second high-potential-side voltage being higher than the first high-potential-side voltage; and a switch control circuit which generates the select signal by using a polarity reversal signal which designates polarity reversal timing of voltage applied to the electro-optical substance, wherein the first intermediate voltage is higher than the first low-potential-side voltage and lower than the first high-potential-side voltage, and wherein, when the common electrode voltage supply circuit changes the voltage of the common electrode from the first low-potential-side voltage to the first high-potential-side voltage, the common electrode voltage supply circuit supplies the first high-potential-side voltage or the first intermediate voltage to the common electrode in a first period, supplies the second high-potential-side voltage to the common electrode in a second period after the first period, and supplies the first high-potential-side voltage to the common electrode in a third period after the second period.