Optical modulatoin device and driving method thereof

The driving method for an optical modulation apparatus according to an embodiment of the present invention includes the first plate, the face the first plate, wherein at least one of the upper electrode and a second orientation, including the plurality of lower plate electrode and a first alignment 2 plate, and a first plate and a position between the second plate and the light that has a liquid crystal layer comprising a plurality of liquid crystal molecules, the alignment direction's first orientation alignment direction and the second alignment of substantially parallel to each other modulator in the driving method comprising: applying a voltage to the upper electrode, at least one of applying a first drive signal to the lower plate electrode by forming a net phase gradient, a plurality of lower plate electrode corresponding to the first regions of the plurality of lower plate electrode in at least one of the lower plate electrode corresponding to the second region between the first drive signal and the other comprising the steps of: applying a second drive signal to form a reverse phase gradient and a plurality of lower plate electrode of the first region and the second region The applying at least one first driving signal and the second driving signal and another driving signal to the third electrode corresponding to the lower plate 3 region comprises forming a flat phase slope.