Light redirecting films and film systems

摘要

A light redirecting film comprising a thin optically transparent substrate having a light entrance surface for receiving light from a light source and an opposite light exit surface, at least one of the surfaces having a pattern of individual optical elements of well defined shape having at least two curved surfaces, one of the curved surfaces of the optical elements having a different curvature than the other curved surface, the optical elements being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution.