A power supply circuit that supplies a potential to an electro-optical device that includes a plurality of scanning lines and a plurality of data lines, said scanning lines crossing said data lines, and said potential serving as a selection voltage for selecting a scanning line from said plurality of scanning lines, said power supply circuit comprising:
- a voltage generation circuit that generates one of a selection voltage having a positive polarity and a selection voltage having a negative polarity, defined with respect to a median value of signal voltages applied to said data lines;
- a voltage storage element that stores a voltage based on said one selection voltage generated by said voltage generation circuit;
- and
- an inverter circuit that inverts the polarity of the voltage stored in said voltage storage element with respect to a predetermined reference value, and that outputs the inverted voltage as another one of said selection voltage having a positive polarity and said selection voltage having a negative polarity,
- said voltage generation circuit comprising:
- a switching element;
- and
- an inductor that stores electric power between a first input potential and a second input potential when said switching element turns on, and that releases the stored electric power when said switching element turns off,
- using the electric power released from said inductor, said voltage generation circuit generating said one of the selection voltage having a positive potential and the selection voltage having a negative polarity with respect to the median value of signal voltages applied to said data lines, wherein the inverted voltage is a separately available output as another one of said selection voltage.