A pixel circuit disposed at a part where a scanning line and a
signal line intersect each other includes at least an electrooptic element, a drive
transistor, a sampling
transistor, and a retaining
capacitance. The drive
transistor has a gate connected to an input node, a source connected to an output node, and a drain connected to a predetermined power supply potential and supplies a
driving current to the electrooptic element according to a
signal potential retained in the retaining
capacitance. The electrooptic element has one terminal connected to the output node and another terminal connected to a predetermined potential. The sampling transistor is connected between the input node and the
signal line and operates when selected by the scanning line, samples an input signal from the signal line, and retains the input signal in the retaining
capacitance. The retaining capacitance is connected to the input node. The pixel circuit further includes a compensating circuit which detects a decrease in the
driving current from a side of the output node, and feeds back a result of detection to a side of the input node, for compensating for a decrease in the
driving current which decrease is attendant on a secular change of the drive transistor.