Patent ID: 8704857

Claim:
A three-dimensional display device, comprising: an image displaying device; an optical control element positioned adjacent to a surface of the image displaying device; a direction sensor adapted for measuring an inclination angle of the image displaying device; and a control unit, adapted for adjusting images displayed by the image displaying device according to the inclination angle, wherein the control unit adjusts transverse periods and right-and-left movements of the images displayed by the image displaying device. wherein: the direction sensor is a gravity sensor; the inclination angle comprises a first inclination angle of the image displaying device with respect to a horizontal direction and a second inclination angle of the image displaying device with respect to a vertical direction, the first inclination angle is α which is expressed as α=arcsin [(Vx−V 0 )/V], and the second inclination angle is β which is expressed as β=arcsin [(Vy−V 0 )/V], provided that V X is an output voltage of the direction sensor at the first inclination angle α; Vy is an output voltage of the direction sensor at the second inclination angle β, V 0 is an output voltage of the direction sensor in an aclinic state, and V is an output voltage of the direction sensor under acceleration of gravity.