A driving controller of a display device includes a timer which counts an operation time and outputs a count signal, a memory which stores compensation data, a control signal generation part which receives the compensation data from the memory in response to the count signal and outputs a compensation data signal corresponding to the compensation data, and an image processor which converts an image signal into a data signal and outputs the data signal, where the data signal is obtained by combining the image signal and the compensation data signal. The compensation data includes first compensation data corresponding to a first operation time and second compensation data corresponding to a second operation time which is different from the first operation time.