Patent ID: 7806545

Claim:
An optical plate, comprising: a first transparent layer; a second transparent layer; and a light diffusion layer between the first transparent layer and the second transparent layer, the light diffusion layer including a transparent matrix resin and a plurality of diffusion particles dispersed in the transparent matrix resin, wherein the first transparent layer, the light diffusion layer, and the second transparent layer are integrally formed, with the first transparent layer in immediate contact with the light diffusion layer, and the second transparent layer in immediate contact with the light diffusion layer, the first transparent layer comprises a plurality of elongated V-shaped protrusions at an outer surface thereof that is distalmost from the second transparent layer, the second transparent layer comprises a plurality of micro-recesses at an outer surface thereof that is distalmost from the first transparent layer, each micro-recess is defined by at least three sidewalls interconnecting with each other, and a horizontal width of each sidewall of the micro-recess increases along a direction from an inmost end of the micro-recess to an opening of the micro-recess; wherein an interface between the light diffusion layer and the first transparent layer defines a plurality of micro-recesses having a same shape and arrangement as the micro-recesses at the outer surface of the second transparent layer.