OPTICAL FILM, SURFACE LIGHT EMITTER, AND MANUFACTURING METHOD FOR OPTICAL FILM

摘要

PROBLEM TO BE SOLVED: To provide an optical film which improves light extraction efficiency and frontal luminance of a surface light emitter and suppresses exit angle dependence of an output light wavelength of the surface light emitter.SOLUTION: An optical film includes a plurality of convex microlenses 11, each comprising a portion α 12 and a portion &bgr; 13. The portion &bgr; occupies an outer portion of the convex shape and is positioned to cover the portion α that contains a matrix resin Mand light diffusion fine particles P. Difference in refractive index between the matrix resin Mconstituting the portion α and the light diffusion fine particles Pincluded in the portion α shall be no less than 0.12.SELECTED DRAWING: Figure 1