Patent ID: 7967489

Claim:
An optical sheet comprising: a base film; a plurality of prism patterns formed on an upper surface of the base film, each of the prism patterns having the shape of a trigonal prism and including a first inclined surface and a second inclined surface which are inclined with respect to the upper surface of the base film and meet each other at a peak portion, wherein the first inclined surface of a first prism pattern and the second inclined surface of a second prism pattern adjacent to the first prism pattern meet each other at a valley portion; a plurality of first embossing patterns formed at the valley portion; and a plurality of second embossing patterns on the peak portion, wherein the first embossing patterns have a non-prismatic convex shape and spanning from the first inclined surface of the first prism pattern to the second inclined surface of the second prism pattern adjacent the first prism pattern, and the second embossing patterns have a concave shape.