An exemplary three-dimensional display device includes a flat panel display and a light regulating sheet positioned on the flat panel display. Light beams emitted from the flat panel display and input to the light regulating sheet are adjusted by the light regulating sheet and output from the light regulating sheet at predetermined angles relative to their input angles. The light regulating sheet includes at least one light regulating ring divided into a plurality of light regulating units. The flat panel display includes a plurality of display units corresponding to the plurality of light regulating units. Each display unit displays a two-dimensional image of an object viewed from a predetermined viewing angle position. Each light regulating unit limits the two-dimensional image to within a viewing angle range corresponding to the predetermined viewing angle position, and the two-dimensional images of the object displayed in the display units are different from each other.