Patent ID: 7789548
Filing Date: 2010-09-07
Classification: G02B

Abstract:
1. An optical diffusion module, comprising: an optical diffusion structure comprising a plurality of convex portions having a first curvature, a plurality of concave portions having a second curvature, and a plurality of saddle portions, wherein each convex portion is adjacent to a plurality of concave portions and a plurality of saddle portions and each concave portion is adjacent to a plurality of convex portions and a plurality of saddle portions which are lower than the convex portions and higher than the concave portions, the first curvature, the second curvature, and a curvature of each junction of the convex and concave portions is different from 0, and surfaces of the convex and concave portions are continuous and smooth; and a diffusion plate having a first surface, wherein the optical diffusion structure is formed on the first surface, and the convex portions are arranged in a two dimensional array along a first direction and a second direction, and the concave portions are arranged in a two dimensional array along a third direction and a fourth direction, and each convex portion is sandwiched by saddle portions in both the first direction and the second direction, and each concave portion is sandwiched by saddle portions in both the first direction and the second direction, and distances from one convex portion to other convex portions, which are adjacent to the one convex portion, are different along the second direction.