Abstract: An optical film and a display are provided and including a substrate and microstructures. The microstructures are disposed on the substrate, wherein the microstructure includes first line segment portions and second line segment portions, and wherein in an extension direction of the microstructure, the first line segment portions and the second line segment portions are alternately arranged and connected to each other, and an extending direction of the first line segment portions intersects with an extending direction of the second line segment portions. The present application utilizes the microstructures disposed on the substrate to change the optical path of part of the light of the display screen, thereby weakening the phenomenon of light and dark stripes and moiré patterns caused by the periodic microstructures of the display screen.

Abstract: A viewing angle expansion film, a method for preparing the same, and a display device are provided. The viewing angle expansion film includes a first film layer having a flat layer, a plurality of first projections, and a plurality of second projections, and a second film layer disposed on the first film layer. The plurality of first projections and the plurality of second projections are arrayed on the flat layer. The second film layer is filled in gaps between the first projections and the second projections adjacent to the first projections, gaps between adjacent first projections, and gap between adjacent second projections. A refractive index of the second film layer is greater than a refractive index of the first film layer.