Patent ID: 9594194
Date: 2017-03-14
CPC Classifications: G02B,G02F,G03F,Y10T

Claim:
1. A light diffusion member comprising: a rectangular substrate having light transmissivity; a plurality of light shielding layers formed on one face of the substrate; and light diffusion portions formed on the one face of the substrate at regions other than regions where the light shielding layers have been formed; wherein the light diffusion portions have wherein light which enters from the light incident end surface is anisotropically diffused in an azimuth direction seen from a normal direction of the substrate, wherein a height from the light incident end surface to the light-emitting end surface of the light diffusion portion is greater than a thickness of the light shielding layers, wherein the azimuth direction where the diffusion by the light diffusion member proper is relatively strong, and any one side making up the outer shape of the substrate, are generally parallel, wherein a planar shape of the light shielding layers seen from a normal direction of one face of the substrate is an anisotropic shape having at least a major axis and a minor axis, and wherein a hollow portion sectioned by formation regions of the light diffusion portions is formed in a formation region of the light shielding layers, and air is present in the hollow portion.