A system of transmitting display data is presented. The system includes a frame encoding part configured to receive a source frame and output a compressed frame. The frame encoding part has: a difference unit configured to generate a difference frame using the source frame and an encode reference frame; an encode output unit configured to output a compressed version of either the source frame or the difference frame as a compressed frame; and a first compressed frame buffer configured to store a compressed version of the source frame as a new encode reference frame, wherein the frame encoding part further includes a frame decision unit configured to compare the image quality of frames respectively derived from the source frame and the difference frame.