A driving device and a driving method thereof. The driving device comprises a system-on-chip and a timing control board. The system-on-chip is set to receive and process image data signals of frames to be transmitted, and output a first image data signal and a difference signal between image data signals of the current frame and the previous frame. The timing control board is set to process the first image data signal, then output a second image data signal, and to perform the output according to the difference signal and the second image data signals of the current frame and the previous frame.