Liquid crystal driver and optical head for tilt correction

A liquid crystal driver comprising:

• a periodic waveform generator which generates a periodic waveform signal;
• a plurality of phase shifters provided for phase shift in a plurality of directions, each of said plurality of phase shifters receiving the periodic waveform signal from said periodic waveform generator and shifts phase thereof according to an instructed value for each direction in the plurality of directions;
• a plurality of inverting elements for inverting output signals of said plurality of phase shifters;
• a plurality of potential dividers each comprising a plurality of resistors connected in series, being connected to the output signal of one of said phase shifters and to the output signal of one of said plurality of inverting elements at two ends thereof;
• and
• a liquid crystal element comprising electrodes of a plurality of areas extending in the plurality of directions and a common electrode opposing the electrodes, said common electrode being connected to the periodic waveform signal outputted by said periodic wave generator, said plurality of areas being connected to output voltages of said plurality of potential dividers.