Optical light redirecting stack including light redirecting layers with truncated structures

Abstract

An optical stack includes stacked first and second light redirecting layers, each light redirecting layer including a plurality of truncated first structures, each truncated first structure with opposing side surfaces making an angle of between about 60 degrees to about 120 degrees with each other and a substantially planar top surface joining the opposing side surfaces, and a plurality of untruncated second structures, each untruncated second structure with opposing side surfaces making an angle of between about 60 degrees to about 120 degrees with each other and meeting at peak, wherein the peaks of the untruncated second structures and the substantially planar top surfaces of the first truncated structures substantially lie in the same plane.

Dependencies are inferred from the claim text.