Patent ID: 8159633

Claim:
An optical plate, comprising: a transparent layer comprising a light input interface, a flat surface opposite to the light input interface, and a plurality of curved, elongated, V-shaped micro-protrusions formed on the flat surface, wherein each of the curved, elongated, V-shaped micro-protrusions extends respectively along only one circular arc having a constant radius and two ends substantially adjacent to the opposite side surfaces of the optical plate viewed from a top aspect of the curved, elongated, V-shaped micro-protrusions and opposite to the flat surface, each of the V-shaped micro-protrusions are the same, and the only one circular arc defined in the flat surface: and a light diffusion layer integrally formed in contact with the light input interlace of the transparent layer, and free of air or gas pockets trapped in an interface therebetween, wherein the light diffusion layer comprises a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin, and a plurality of V-shaped micro-protrusions formed on an outer surface thereof.