Patent ID: 8643965

Claim:
An enhanced prism film, comprising a plurality of column-like elements extending in a first direction, wherein the plurality of column-like elements abut against one another in a second direction so as to form a light exiting surface of the enhanced prism film with converging effect in both the first and second directions, the second direction being different from the first direction, wherein a cross section of the light exiting surface of the enhanced prism film along the first direction comprises a plurality of triangles connected with each other and the cross section of the light exiting surface of the enhanced prism film along the second direction comprises a plurality of arches connected with each other, wherein each column-like element comprises a plurality of first partial truncated cones and a plurality of second partial truncated cones alternately connected in such a manner that a bottom of each first partial truncated cone abuts against a bottom of an adjacent second partial truncated cone and a top of the first partial truncated cone abuts against a top of the adjacent second partial truncated cone, the bottom of the first partial truncated cone has a width larger than a width of the top of the first partial truncated cone, and the bottom of the second partial truncated cone has a width larger than a width of the top of the second partial truncated cone.