Disclosed are a display device and a driving method thereof, which solve a problem where consumption power of a sync side increases when a remote frame buffer is used by applying PSR technology and MBO technology to the sync side. The display device includes a display panel displaying an image, a source side generating raw digital video data and supplying first digital video data generated by omitting at least one active frame in the raw digital video data, a sync side receiving the first digital video data, copying digital video data of an active frame, which is adjacent to the at least one active frame, to the at least one active frame to generate second digital video data, and generating a data driver control signal, and a data driver receiving the second digital video data and the data driver control signal to supply data voltages to the display panel.