The present embodiments may provide a display device that includes a display panel; a data driver configured to include a plurality of driver Integrated Circuits (ICs) configured to supply a data signal to the display panel and to be present on the display panel, and to have a first characteristic and a second characteristic corresponding to variation between at least two driver ICs among the plurality of driver ICs; and a controller configured to supply a first voltage and a second voltage to the data driver, to identify change values of the first characteristic and the second characteristic corresponding to the first voltage and the second voltage, and to change the first characteristic and the second characteristic corresponding to the change values, and may provide a method for operating the same.