A three-dimensional (3D) display including a display panel and a phase retardation film is provided. The display panel has a plurality of first pixel regions and a plurality of second pixel regions that are arranged as an array. The phase retardation film is disposed on the surface of the display panel. The phase retardation film has a plurality of first retardation regions and a plurality of second retardation regions that are alternately arranged. The first retardation regions have the same phase retardation, the second retardation regions have the same phase retardation, and the phase retardation of the first retardation regions is different from that of the second retardation regions. All the regions of the phase retardation film have the same transmittance. A display method adaptable to the 3D display is also provided.