A display device includes a display panel including areas including pixels electrically connected to a plurality of gate lines and a plurality of data lines; a gate driver that supplies a gate signal to each of the plurality of gate lines; an average grayscale calculator that receives input image data, and calculating average grayscale values with respect to the areas; an area determiner that compares the average grayscale values with a low grayscale reference value to determine a low grayscale area among the areas, and output a charge boosting signal; a memory that stores gate clock signal information according to a grayscale; and a gate clock signal generator that supplies a gate clock signal corresponding to the areas to the gate driver by reflecting the charge boosting signal and the gate clock signal information according to the grayscale.