Optical film

The invention relates to an optical film comprising a first diffraction structure layer, a second diffraction structure layer, and a cover layer. A plurality of first diffraction gratings arranged inthe same direction are arranged on the surface of the first diffraction structure layer; the gaps between the first diffraction gratings of the first diffraction structure layer are filled with the second diffraction structure layer; and a plurality of second diffraction gratings arranged in the same direction are arranged on the first diffraction structure layer, wherein the arrangement directionof the first diffraction gratings and the arrangement direction of the second diffraction gratings are parallel to each other. The cover layer is formed on the second diffraction gratings of the second diffraction structure layer. At least one of the first diffraction structure layer, the second diffraction structure layer, and the cover layer includes dye. With the optical film, the light leakage defect of the existing l