Patent ID: 8905613

Claim:
A display device, comprising: a backlight module having a light-emitting surface and generating backlight along a normal direction of the light-emitting surface; an optical film set comprising: a light-splitting layer disposed above the light-emitting surface, wherein the light-splitting layer splits the backlight into a first backlight group and a second backlight group; average light-emitting directions of both backlight groups are inclined with respect to the light-emitting surface and vector components thereof in a direction parallel to the light-emitting surface have opposite directions; and a grating layer disposed above the light-splitting layer, the grating layer only allowing the first backlight group to pass while blocking the second backlight group from passing; a display panel disposed above the grating layer; and a prism film disposed on one side of the display panel opposite to the optical film set, wherein the prism film has a plurality of prisms disposed side-by-side on one side of the prism film facing the display panel; wherein an extending direction of the prisms at least partially traverse across the average light-emitting direction of the first backlight group; two sides of each prism are respectively a first surface and a second surface; the first surface and the second surface are asymmetric and projection areas of the first surface and the second surface onto the prism film do not overlap; an angle between the first surface and a normal line to the light-emitting surface is greater than an angle between the second surface and the normal line to the light-emitting surface; a included angle between the second surface and a parallel line to the light-emitting surface is greater than or equal to 80 degrees and smaller than or equal to 90 degrees.