Patent ID: 6773127
Filing Date: 2004-08-10
Classification: G02B

Abstract:
A positioning structure of a back light module, comprising:an optical film, comprising at least one flange respectively disposed at two corresponding edges thereof, and said flange comprising a neck portion having a narrower width than that of said flange; and a frame, used to position said optical film, and comprising: a base containing said flange of said optical film; a constraining block, protruding from a surface of said base and corresponding to said neck portion of said flange so as to limit displacement of said flange parallel to the surface of said base; and a bridge, mounted on the top of said base, limiting displacement of said flange perpendicular to the surface of said base, wherein gaps as displacement space when said optical film is heated to deform are retained both between said constraining block and said neck portion of said flange, and between said bridge and said flange.