An apparatus (100) for use in driving a display, especially a color electrophoretic display comprising frame generating means generating a succession of frame pulses at regular intervals; frame blanking generating means generating a succession of frame blanking pulses at the same intervals; a plurality of input lines each arranged to receive one of a plurality of differing input voltages (Vin1, . . . VinN), all of the same polarity; an output line capable of being connected to a device driver (106); and switching means (102A, . . . 102N) connecting the output line to one of the input lines when no frame blanking pulse is present, the switching means (102A, . . . 102N) being capable of changing the input line to which the output line is connected during successive frame periods, the switching means (102A, . . . 102N) being arranged to drain charge from the output line when a frame blanking pulse is present.