LIGHT REDIRECTING FILMS AND FILM SYSTEMS

摘要

A light redirecting film comprising a thin, transparent substrate having a pattern of individual optical elements of well defined shape on or in the substrate, the individual optical elements each having a length and a width many times smaller than the length and width of the substrate, at least some of the optical elements varying at different locations on the substrate to redistribute light passing through the substrate toward a direction normal to the substrate, wherein at least some of the optical elements comprise at least two oppositely curved surfaces.