The present invention relates to an organic electroluminescent device and driving method thereof.The method of driving an electroluminescent device having a plurality of pixels formed on emitting areas crossed by data lines and scan lines comprises detecting a gray scale of a data current according to a display data inputted from outside, and discharging the data lines to a discharging level corresponding to the display data according to the detected gray scale.The organic electroluminescent device and driving method thereof according to the present invention can emit the pixels as desired brightness independently of a gray scale by making the discharging circuit regulate the discharge level according to the gray scale.