A display device that can reduce color shift and prevent the quality of an image from degrading due to Moire. The display device includes a display panel and an optical film, which includes a background layer disposed in front of the display panel, and a lens section formed on the background layer. The lens section has a plurality of patterns spaced apart from each other to diffuse incident light. The spacing [tau] and pitch T of the patterns are determined by the following m value in the following formulae, and m = P / T, p / P is an aperture ratio of sub-pixels of the display panel, [tau] / T is an aperture ratio of the lens section, I is an intensity of light exiting the optical film after being diffused through the sub-pixels, P and p are a pitch and a width of the sub-pixels, T is a pitch of the patterns, and [tau]=T-W.