Patent ID: 8432628
Filing Date: 2013-04-30
Classification: G02B

Abstract:
1. An optical film comprising: a light transmissive substrate having a first surface and a second surface opposite to the first surface; a plurality of strip protrusions disposed on the first surface, each of the strip protrusions having two strip surfaces, a crest line being formed at a junction of the two strip surfaces and the junction of the two strip surfaces of each of the strip protrusions is a round chamfer, a valley line being formed between every two of the strip protrusions adjacent to each other; and a plurality of protruding structures disposed on the crest lines of at least parts of the strip protrusions, wherein each of the protruding structures has a protruding end and two wing portions connected to the protruding end, the protruding end protrudes from the crest line of the corresponding strip protrusion, the two wing portions are respectively located on the two strip surfaces of the corresponding strip protrusion, each of the wing portions extends from the protruding end to a place between the crest line and the valley line, a length of each of the protruding structures in a direction parallel to an extension direction of the crest line is L, a width of each of the protruding structures in a direction perpendicular to the crest line is W, and L/W≧1.2, such that the contact area between an optical device and the optical film is increased.