Organic light emitting display device and method for driving the same

An organic light emitting display device comprising:

• a display panel having a plurality of sub-pixels, wherein each sub-pixel has an organic light emitting diode which emits light by a data current based on a data voltage;
• a memory which stores accumulated data of each sub-pixel therein;
• a data accumulator which accumulates input data of each sub-pixel every accumulation period and stores the accumulated data in the memory;
• a degradation compensation gain value generator which generates a degradation compensation gain value of each sub-pixel on the basis of an accumulation difference value between the accumulated data of each sub-pixel and a reference accumulated data corresponding to any one from accumulated data of all sub-pixels stored in the memory;
• and
• a data modulator which directly reflects the degradation compensation gain value of each sub-pixel to the input data of each sub-pixel to generate modulated data of each sub-pixel, converts the modulated data into the data voltage, and supplies the data voltage to each sub-pixel,
• wherein the degradation compensation gain value generator extracts a maximum accumulated data from the accumulated data of all the sub-pixels stored in the memory and sets the reference accumulated data to the extracted maximum accumulated data, and
• wherein a luminance of each sub-pixel having the accumulation difference value is decreased to a luminance of a sub-pixel having the maximum accumulated data.