Electrode Driving Schemes for Tunable Lens Systems

An adjustable lens comprising a stack of liquid crystal cells, wherein each liquid crystal cell comprises:

• liquid crystal material interposed between first and second substrates;
• at least one array of transparent conductive electrodes that adjust a phase profile of the liquid crystal material;
• a first number of digital-to-analog converter circuits that provide voltages to the array of transparent conductive electrodes;
• and
• switching circuitry that sequentially couples and decouples the first number of digital-to-analog converter circuits to different groups of transparent conductive electrodes in the array, wherein with each clock cycle, the switching circuitry advances the digital-to-analog converter circuits from group-to-group by a second number of the transparent conductive electrodes that is less than the first number.

Eyeglasses, comprising:

• a housing;
• an adjustable lens in the housing having a liquid crystal cell and an array of electrodes that receive voltages to adjust a phase profile of the liquid crystal cell, wherein the array of electrodes includes first and second groups of electrodes and wherein a given one of the electrodes is part of the first and second groups;
• and
• driving circuitry that is coupled to the first group of the electrodes and decoupled from the second group of electrodes during a first clock cycle and that is coupled to the second group of electrodes and decoupled from the first group of electrodes during a second clock cycle, wherein the given one of the electrodes is driven at the same voltage during the first and second clock cycles.