Patent ID: 7880971

Claim:
A light-collimating film, comprising: a transparent substrate having a light incident surface and a light-emitting surface opposite the light incident surface; a plurality of reflective elements formed on the light incident surface, wherein each two adjacent reflective elements define a longitudinal aperture, and longitudinal axes of the longitudinal apertures are parallel to each other; a plurality of micro structures arranged on the light-emitting surface in a direction parallel to the longitudinal axes of the longitudinal apertures and overlapping the longitudinal apertures to form a plurality of rows of micro structures, wherein each of the micro structures comprises: a first side portion that is allowed to deflect a first light beam incident thereon toward a first virtual central plane of the micro structure which equally divides the micro structure; a second side portion that is allowed to deflect a second light beam incident thereon toward a second virtual central plane of the micro structure, with the second virtual central plane being substantially perpendicular to the longitudinal axis of the longitudinal aperture.