Patent ID: 8200060

Claim:
A brightness enhancement sheet, comprising: a light transmissive substrate having a first surface and a second surface opposite to the first surface; a plurality of strip prisms disposed on the first surface, wherein each of the strip prisms has two prism surfaces, a junction of the two prism surfaces forms a crest line, and a valley line is formed between each of the two adjacent strip prisms; and a plurality of protruding structures disposed on at least a portion of the strip prisms, wherein each of the protruding structures has two wing portions respectively disposed on two prism surfaces of the corresponding strip prism, a junction of the two wing portions forms a protruding end, the protruding end protrudes from the crest line of the corresponding strip prism, each of the wing portions extends from the protruding end to the valley line and protrudes from the corresponding prism surface and the valley line.