Abstract: The invention concerns drive circuitry for generating a plurality of independent drive voltage signals for a plurality of electrodes of at least one liquid lens, the liquid lens comprising first and second miscible liquids, an interface between the first and second liquids being movable by electro wetting by application of a drive voltage signal to at least one electrode of the liquid lens, the drive circuitry including generating circuitry (406, 408, 410, 412) arranged to generate a fixed drive voltage (Vdc); a duty cycle controller (418) arranged to receive data values indicating a duty cycle to be applied to each of the plurality of electrodes, and to generate a control timing signal for each of the plurality of electrodes, each control timing signal having the duty cycle indicated by the controller; and driving means (426, 428, 430, 432) arranged to generate an independent drive voltage signal for each of the plurality of electrodes by selectively applying the fixed drive voltage, based on the control tim