A display device includes a display unit which includes pixels and displays an image, a data driver which supplies a data signal to the pixels, and a timing controller which controls the data driver using a timing control signal. Here, the timing control signal may include a vertical synchronization signal for defining a frame period and a data enable signal for defining a display period during which an image is displayed and a blank period during which an image is not displayed. Here, lengths of blank periods may be equal to each other in a first driving mode in which the vertical synchronization signal is supplied to the timing controller in a constant cycle and in a second driving mode in which the vertical synchronization signal is supplied in different cycles.