There are provided a display device and a driving method thereof. The display device includes a timing controller configured to generate second image data from first image data, and to output the second image data, and an image display unit configured to output an image corresponding to the second image data, wherein the timing controller is configured to generate the second image data by correcting the first image data based on a comparison result between a target current value, which corresponds to a load value of the first image data, and a measured current value that is measured with respect to the image display unit.