Patent ID: 7079106

Claim:
A signal output device for supplying image signals to source lines of a display device via an image line, comprising: a bypass section which connects a predetermined number of the source lines with one another, so that the image signal to one of the predetermined number of the source lines is simultaneously supplied to all of the predetermined number of the source lines; a plurality of image lines respectively connected to an identical number of the source lines in groups, so as to simultaneously supply the image signals to the source lines of each group; a control section for performing multi phase process of an original image signal so as to generate split signals and controlling the bypass section, in accordance with a low resolution mode or a high resolution mode; the low resolution mode being a display mode in which the split signals are generated in a number smaller than a number of the image lines, and the split signals are respectively supplied to an identical number of the image lines, and the bypass section is controlled so as to connect the source line connected to the image line that has received the split signal with the source line connected to the image line that did not receive the split signal; and the high resolution mode being a display mode in which the split signals are generated in a number equal to the number of the image lines, and the split signals are respectively supplied to an identical number of the image lines, and the bypass section is controlled so as to prevent the source lines from being connected with one another.