Patent ID: 6665029
Filing Date: 2003-12-16
Classification: G02B,G02F

Abstract:
An optical film comprising:a transparent film including a repetitive structure of a plurality of light exit means arranged at intervals of a regular pitch or intervals of irregular pitches in one of opposite surfaces of said transparent film, said repetitive structure of said plurality of light exit means having optical path changing slopes each inclined to said film surface at an inclination angle in a range of from 30 to 48 degrees in order to change an optical path of light from a direction of said film surface into a direction of thickness of said film; and an anti-reflection layer disposed on said film surface in which said plurality of light exit means are formed, wherein said anti-reflection layer exhibits a reflectance of not higher than 1.5% with respect to perpendicularly incident light with a wavelength of 550 nm, said optical film is light-transmissible in said direction of the thickness of said film, and the thickness of the transparent film is set to be not larger than 300 &mgr;m.