for an organic el device is mos type transistor mosfet and the characteristic of resistance at the time of turn on is dependent on a threshold voltage of the gate of the mosfet in a practical process it is very difficult to uniformly manufacture characteristics of threshold voltage vth of all the switching transistors qs within one frame for this reason in the present invention the characteristic of the organic el light emitting of each pixel is not sensitive to the threshold voltage characteristic and is also made to be constant even if a characteristic distribution exists a little in the el device now a method by which many organic el devices formed in a matrix type within an organic el panel have uniform characteristics will be described fig5 a is a diagram to illustrate a characteristic of voltage to current in a switching element of a conventional organic el display and fig5 b is a diagram to illustrate a characteristic of voltage to current in a switching element of the present invention when a switching transistor qs is conductive a storage capacitor cst is charged with negative polarity compared with ground gnd and this charged voltage is applied to a gate of a driving transistor qd to be turned on since the driving transistor qd is a p type mosfet herein the charged voltage is referred to as vgg a voltage across the gate terminal and the source terminal of the driving transistor qd as vgs a voltage across the source resistor rs as vrs a current flowing through the drain to source of the driving transistor qd as.