Optical modulation device and driving method thereof

A driving method of a liquid crystal lens panel comprising a first plate comprising a first region, a second region, and first electrodes at the first region and the second region;

• a second plate facing the first plate and comprising second electrodes that face the first electrodes;
• and a liquid crystal layer between the first plate and the second plate and comprising a plurality of liquid crystal molecules, the method comprising:
• forming a backward phase slope in the liquid crystal layer by applying a first driving signal to the first electrodes and the second electrodes which correspond to the first region;
• and
• forming a forward phase slope in the liquid crystal layer by applying a second driving signal that is different from the first driving signal to the first electrodes and the second electrodes which correspond to the second region,
• wherein a first pretilt angle of the liquid crystal molecules positioned at the first region and a second pretilt angle of the liquid crystal molecules positioned at the second region are symmetrical to each other with respect to an interface between the first region and the second region.