Organic light emitting display device and method of driving the same

An organic light emitting display device comprising:

• a pixel unit including pixels arranged at every intersection between data lines and scan lines;
• a data driving unit supplying a data signal to the data lines;
• a scan driving unit supplying scan signals to the scan lines sequentially;
• an image analyzer analyzing an input image and outputting a maximum luminance level of the input image according to the analyzed result;
• a power voltage controller reading a voltage level corresponding to the maximum luminance level from a lookup table and outputting a power voltage control signal corresponding to the read voltage level;
• a power supply supplying a power voltage corresponding to the voltage level to the pixel unit via power lines in response to the power voltage control signal;
• and
• a corrector correcting the voltage level corresponding to the maximum luminance level stored in the lookup table based on a difference between a current flowing through the power lines and a current estimated in corresponding to the voltage level.