Patent ID: 7286125

Claim:
A power supply method of supplying a high-potential drive power voltage to a driver circuit which receives a low-potential drive power voltage in addition to the high-potential drive power voltage and drives a plurality of data lines in a display panel which has a plurality of pixels and a plurality of scanning lines in addition to the data lines, the method comprising: setting an output from the driver circuit to the data lines to a high-impedance state, and accumulating a charge corresponding to a charge discharged from the data lines in a parasitic capacitor of a power line of a regulator which outputs a drive power voltage to be supplied to the driver circuit, within a given period; and outputting a voltage generated by the charge accumulated in the parasitic capacitor to the power line, and supplying a voltage generated by the regulator to the driver circuit as the high-potential drive power voltage for the driver circuit, after the period.