An organic EL display device includes a controller, a data driver, and a DRAM which provides a gain correction memory and a threshold voltage correction memory. The data driver sends, to the controller, first and second measurement data Im corresponding to the first and second measuring data voltages Vm, respectively. The controller compares ideal characteristic data IO(P) with the first and second measurement data Im, and updates threshold voltage correction data Vt and gain correction data B2R based on the comparison results. The controller corrects video data Vm based on the threshold voltage correction data Vt and the gain correction data B2R. Thereby, both threshold voltage compensation and gain compensation of a drive transistor are performed with respect to each pixel circuit, while display is performed.