Patent ID: 8823901

Claim:
A prism sheet comprising: a plurality of first prism mountains formed to be aligned with each other on a supporting film, and having a first pitch; a plurality of resin layers only between the first prism mountains, wherein each of the resin layers is formed in an inverted triangle pattern; and a plurality of second prism mountains formed to be aligned with each other on the resin layers and the plurality of first prism mountains, and having a second pitch which is twice as greater as the first pitch, such that a center of a bottom side of each second prism mountain is placed on one of the first prism mountains and ends of the bottom side are placed on each apex of adjacent two first prism mountains, wherein each second prism mountain directly contacts to the resin layer and each apex of adjacent two first prism mountains, and wherein the second prism mountain is in direct contact with at least two adjacent inverted triangle patterns of the resin layers and at least three apices of adjacent three first prism mountains.