Using scan (TFT 1-1TFT 1-3) data having a size of 3 bits from data lines (DATA1DATA3) is stored in storage capacitors (SC1SC3). Driving TFTs (TFT 2-1TFT 2-3) are switched fully on by the voltage of these storage capacitors (SC1SC3). The on/off conditions of the driving TFTs (TFT 2-1TFT 2-3) are controlled according to digital data, to control the on/off conditions of organic EL elements (EL1EL3) and provide brightness control.