Patent ID: 8842239

Claim:
A light-guide apparatus with micro-structures, for accompanying an edge light source, comprising: a light-guiding layer, further defining a light-introducing surface for allowing entrance of light from the edge light source into the light-guiding layer; a reflective layer for reflecting the light back to the light-guiding layer; and a light-distributing layer, to sandwich the light-guiding layer in between with the reflective layer, further defining thereof a free surface opposing to the reflective layer as a light-exiting surface, the light-exiting surface being perpendicular to the light-introducing surface for allowing at least a portion of the light in the light-guiding layer to leave the light-guide apparatus therefrom; the light-guide apparatus characterized on that: the reflective layer, the light-guiding layer and the light-distributing layer are manufactured integrally into a unique piece by a co-extrusion process so as to avoid possible existence of an air spacing between the reflective layer and the light-guiding layer, a reflective surface is defined to an interface between the reflective layer and the light-guiding layer, and three-dimensional micro-structures are constructed on the reflective surface; wherein said micro-structures of said reflective surface satisfy the following criterion: 45 ⁢ ° < cot - 1 ⁡ ( H ⁢ ⁢ 2 0.5 * P ⁢ ⁢ 2 ) < sin - 1 ⁡ ( n ⁢ ⁢ 1 n ⁢ ⁢ 2 ) ; while n1<n2; wherein H2 is a depth of said micro-structures of said reflective surface, P2 is a width of said micro-structures of said reflective surface, n1 is a refractive index of said light-distributing layer, and n2 is a refractive index of said light-guiding layer.