Organic light emitting diode display and method for driving the same

An organic light emitting diode display device comprising:

• an image display panel comprising a plurality of pixel regions;
• a data driver for driving data lines of the image display panel;
• a timing controller for arranging image data input from outside of the organic light emitting diode display device to match a size of the image display panel, and generating a data control signal to control the data driver;
• and a data modulator for sequentially receiving image data of a current frame from the timing controller, counting a number of accumulations of pixels corresponding to image data at a particular position having a lower grayscale value than a grayscale value of predetermined reference data, generating modulated image data through application of a weight value determined in accordance with the counted accumulation number, and supplying the modulated image data to the data driver, wherein the data modulator includes a weight controller for comparing the image data supplied from the timing controller with the predetermined reference data in units of at least one pixel, wherein the comparison is of only the pixels at the particular position, counting an input number of low-grayscale image data having a lower grayscale value than the grayscale value of the predetermined reference data, and outputting the weight value set to correspond to the counted number on a per pixel basis.