Patent ID: 7711223

Claim:
A composite light guiding film module, comprising: a light guiding film comprising a first surface and a light diffusion structure disposed on the first surface, wherein the light diffusion structure comprises a plurality of identical micro convex lenses and a plurality of identical micro concave lenses which are arranged in a periodic, alternating and continuous manner in a first direction and a second direction to form a two dimensional array, each of the plurality of micro concave lenses is peripherally interfaced with a part of the plurality of micro convex lenses at a junction area therebetween, and a curvature of each of the plurality of concave lens and a curvature of the junction area located between the plurality of micro convex lenses and the plurality of concave lenses are not equal to zero; and a refraction element comprising at least one refraction structure, wherein a light beam from a light source passes through the at least one refraction structure of the refraction element and is refracted to the light diffusion structure of the light guiding film, wherein the light beam passing through the light diffusion structure of the light guiding film is refracted into the light guiding film and then propagates in the light guiding film by total reflection, and wherein a traveling direction of the light beam traveling from the light source toward the light diffusion structure of the light guiding film is substantially perpendicular to a traveling direction of the light beam propagating within the light guiding film.