Patent ID: 8085263

Claim:
A power supply circuit that outputs a common electrode voltage to a common electrode of an electro-optical device, the common electrode being provided opposite to pixel electrodes, the power supply circuit comprising: a charge clock generation circuit that generates a charge clock signal; a voltage booster circuit that generates a boost voltage boosted by a charge-pump operation in synchronization with the charge clock signal; and a common electrode voltage generation circuit that outputs a high-potential-side voltage or a low-potential-side voltage to the common electrode as a common electrode voltage, the high-potential-side voltage and the low-potential-side voltage being generated based on the boost voltage, a number of scan lines per frame in a first vertical scan period being an odd number, the number of scan lines per frame in a second vertical scan period subsequent to the first vertical scan period being an even number, the charge clock signal having a rising edge and a falling edge in a positive period both in the first vertical scan period and the second vertical scan period, a sign of voltages between the pixel electrodes and the common electrode being positive in the positive period, the charge clock signal having the rising edge and the falling edge in a negative period both in the first vertical scan period and the second vertical scan period, the sign of voltages between the pixel electrodes and the common electrode being negative in the negative period.