Patent ID: 7940461
Filing Date: 2011-05-10
Classification: G02B,G02F

Abstract:
1. An optical diffusion module, comprising: a first diffusion structure comprising a plurality of convex portions and a plurality of concave portions arranged alternatingly, each adjacent convex portion and concave portion joined at a junction, wherein the junction is an inflection point of a curve defined by said adjacent convex portion and concave portion; and a second diffusion structure comprising a plurality of convex portions and a plurality of concave portions arranged alternatingly, each adjacent convex portion and concave portion joined at a junction, wherein the junction is an inflection point of a curve defined by said adjacent convex portion and concave portion; wherein the first diffusion structure and the second diffusion structure are arranged such that light from a light source passes through the first diffusion structure and the second diffusion structure sequentially, wherein the convex portions and the concave portions of the first diffusion structure are continuous and smooth, and the convex portions and the concave portions of the second diffusion structure are continuous and smooth, and wherein the convex portions of the first diffusion structure and the second diffusion structure, the concave portions of the first diffusion structure and the second diffusion structure, the junctions of the convex and concave portions of the first diffusion structure, and the junctions of the convex and concave portions of the second diffusion structure have a curvature different from 0.