A display device comprises a signal processor configured to generate left-eye and right-eye image data according to an input image signal, a frame rate controller configured to generate a plurality of left-eye and right-eye image data from the left-eye and right-eye image data according to an output frequency, a data formatter configured to alternately organize the plurality of left-eye and right-eye image data generated by the frame rate controller, and a display unit configured to sequentially display the plurality of left-eye and right-eye image data organized by the data formatter.