Patent ID: 9429829
Filing Date: 2016-08-30
CPC Classification: G02B,G03B

Claim Text:
1. An illumination system, comprising: at least one laser light source capable of generating a laser beam; a wavelength conversion device located on a transmission path of the laser beam; and a two-dimensional anisotropic diffusion sheet, located on the transmission path of the laser beam, and located between the at least one laser light source and the wavelength conversion device, wherein the two-dimensional anisotropic diffusion sheet is configured for allowing the laser beam to have an increasing degree of a divergent angle in a first direction greater than an increasing degree of a divergent angle in a second direction, and wherein the first direction is substantially parallel to a slow axis of the laser beam, wherein a surface of the two-dimensional anisotropic diffusion sheet has a plurality of ellipsoid-shaped grooves, and a long axis of each of the ellipsoid-shaped grooves is substantially orthogonal to a fast axis of the laser beam.