ELECTRODE DRIVING SCHEMES FOR TUNABLE LENS SYSTEMS

A pair of eyeglasses may include one or more adjustable lenses. An adjustable lens may include electrically modulated optical material such as one or more liquid crystal cells having a phase profile that is adjusted using patterned electrodes. Digital-to-analog converter circuits may provide voltages to the electrodes. To save space on the lens, a smaller number of digital-to-analog converter circuits may provide voltages to a greater number of electrodes by sequentially coupling and decoupling the digital-to-analog converter circuits to different groups of electrodes, advancing from group-to-group with each clock cycle by a number of electrodes that is less than the number of digital-to-analog converter circuits. At least one of the electrodes in each group may be driven at the same voltage for two consecutive clock cycles to avoid erroneous voltages resulting from the parasitic capacitance between adjacent fingers.