An image display system includes a data processing device that processes image data, an image display device that displays an image, and a transmission path that transmits data between the data processing device and the image display device. The data processing device generates compensated image data, a partial precision data generating unit divides the compensated image data into a plurality of partial precision data according to precisions, a transmission data judging unit judges whether or not the individual partial precision data are to be transmitted, and a transmitting unit transmits data. The image display device includes a receiving unit, a storage unit, a data synthesizing unit that synthesizes the partial precision data for the individual precisions stored in the storage unit, and an image display unit that displays image data synthesized by the data synthesizing unit.