Patent ID: 8009243
Filing Date: 2011-08-30
Classification: G02B,G02F

Abstract:
1. A light diffusion device, having a light incident surface and a light exit surface, wherein the light exit surface has at least one light scattering pattern, a trajectory of the light scattering pattern is a continuous curve, the continuous curve is shaped in a combination of arcs and winded to form a plurality of closed patterns in sequence on the light exit surface, each of the closed patterns is in tangent to at least one of the other closed patterns at a tangent point to form a rice-like structure between two adjacent tangent points, and two adjacent closed patterns overlap partly, the closed patterns are arranged in sequence along a direction, and each closed pattern is displaced by a fixed distance D with respect to a preceding closed pattern in the direction, a maximum width of each closed pattern along the direction is W, and D<W, W/D is an integer, and wherein the at least one light scattering pattern is a plurality of light scattering patterns arranged side by side, and a distance between two adjacent light scattering patterns is d, where 0 μm<d≦100 μm.