Patent ID: 7256624

Claim:
A combined output driver for transmitting video signals, comprising: a first output driver outputting a first differential signal to a first external input unit through a pair of signal lines according to first input signals; and a second output driver outputting a second differential signal to a second external input unit through the pair of signal lines according to second input signals, the second output driver comprising: a driver buffer comprising first and second power terminals coupled to a first voltage and a first node respectively, to generate two control signals according to the second input signals; an output unit coupled between the first node and a first power rail, generating the second differential signal according to the two control signals; and a power supply selectively providing the first voltage and a second voltage exceeding the first voltage to the first node, such that the first and second power terminals of the driving buffer are coupled to the first voltage in a first mode and of which are coupled to the first and second voltages respectively in a second mode.