A display device includes a view generator, for generating input view numbers according to reference parameters; a view curve modifier, for generating output view numbers according to the input view numbers and at least one S curve; a three dimensional (3D) image data sampling module, for adjusting image data of pixels according to the output view numbers; and a display module, for displaying at least one image according to the pixels and the image data; wherein viewing positions are modified by the view curve modifier to generate modified viewing positions, the viewing positions correspond to first views, the modified viewing positions correspond to second views, and a number of second views is smaller than a number of first views.