Patent ID: 8421723

Claim:
A stereoscopic display apparatus comprising: display having picture elements in a first plane; an optical liquid crystal including at least one optical liquid crystal element, the optical liquid crystal overlying the picture elements in the first plane and directing the outputs of the picture elements in mutually different angular directions, the optical liquid crystal being switchable between two-dimensional state and a three-dimensional state; and a driving circuit which utilizes a capacitive overdrive to apply an A.C. driving voltage to the optical liquid crystal such that the driving circuit: applies an overdrive A.C. voltage to the optical liquid crystal to accelerate switching the optical liquid crystal from the three-dimensional state to the two-dimensional state, the overdrive A.C. voltage being applied by driving the optical liquid crystal at a drive frequency equal to a resonant frequency of the optical liquid crystal in the three-dimensional state, and applies a stationary hold A.C. voltage to the optical liquid crystal to maintain the optical liquid crystal in the two-dimensional state, and absolute value of the overdrive A.C. voltage being at least twice the absolute value of the stationary hold A.C. voltage, the stationary hold A.C. voltage applied at the drive frequency, wherein a switching between the overdrive A.C. voltage and the stationary hold A.C. voltage occurs due to a change in the resonant frequency of the optical liquid crystal as a result of a non-linearity of a capacitance of the optical liquid crystal between the three-dimensional state and the two-dimensional state, and removes the stationary hold A.C. voltage and the overdrive A.C. voltage applied to the optical liquid crystal to switch the liquid crystal from the two-dimensional state to the three-dimensional state.