a display panel including a plurality of pixels;

a controller configured to generate a second data enable signal and second image data by performing a data processing operation on first image data synchronized with a first data enable signal, and to generate an output data enable signal and output image data by performing a black data insertion operation for the second data enable signal and the second image data; and

a data driver configured to provide data signals to the plurality of pixels based on the output data enable signal and the output image data,

wherein the controller obtains a delay time between at least one of the first data enable signal and the second data enable signal or the first image data and the second image data, determines a number of subsequent pulses of the output data enable signal which are to be output during a period from one time point within a frame period to an end time point of the frame period, and adjusts a cycle of the subsequent pulses of the output data enable signal based on the delay time and the number of the subsequent pulses.