Patent ID: 7633478

Claim:
A power supply circuit which supplies voltage to a common electrode which is opposite to each of a plurality of pixel electrodes, an electro-optical substance being interposed between the common electrode and the pixel electrodes, voltages of data lines being respectively supplied to the pixel electrodes, the power supply circuit comprising: a high-potential-side voltage generation circuit which generates a high-potential-side voltage to be supplied to the common electrode; and a low-potential-side voltage generation circuit which generates a low-potential-side voltage to be supplied to the common electrode, the high-potential-side voltage and the low-potential-side voltage being alternately supplied to the common electrode as a common electrode voltage so that polarity of the common electrode voltage based on a given voltage is the same in consecutive first and second horizontal scan periods; and when a precharge voltage of the data lines in a first precharge period in the first horizontal scan period is higher than an average voltage of the data lines set after the first precharge period, the power supply circuit performing supply capability control of the common electrode voltage in a second precharge period of the data lines in the second horizontal scan period, the supply capability control changing at least one of: second current drive capability of the high-potential-side voltage generation circuit in the second precharge period compared with first current drive capability of the high-potential-side voltage generation circuit in the first precharge period, a second output voltage level of the high-potential-side voltage generation circuit in the second precharge period compared with a first output voltage level of the high-potential-side voltage generation circuit in first second precharge period, second current drive capability of the low-potential-side voltage generation circuit in the second precharge period compared with first current drive capability of the low-potential-side voltage generation circuit in the first precharge period and a second output voltage level of the low-potential-side voltage generation circuit in the second precharge period compared with a first output voltage level of the low-potential-side voltage generation circuit in the first precharge period.