Patent ID: 8851732

Claim:
A light-guide module comprising: a light-guide plate (“LGP”) comprising a light-incident surface into which light is incident and a light-exiting surface through which light exits; and a thin-film layer on the LGP, the thin-film layer having a first surface contacting the LGP and a second surface opposite to the first surface, wherein a concavo-convex pattern is formed on the second surface of the thin-film layer, wherein a refractive index of the thin-film layer is smaller than a refractive index of the LGP, wherein the thin-film layer is positioned between the LGP and a plurality of light sources, and wherein the thin-film layer includes light-curable colloidal silica including acrylate, and wherein a period of the concavo-convex pattern satisfies the following equation: A < λ n 0 ⁢ sin ⁢ ⁢ θ 0 ⁢ cos ⁢ ⁢ ϕ + ( n R 2 - n 0 2 ⁢ sin 2 ⁢ ϕ ) 1 2 wherein A is the period of the concavo-convex pattern, λ is a wavelength of incident light, θ is an incident angle of the incident light, and φ is an azimuth angle of the incident light, n 0 is a refractive index of air, and n R is the refractive index of the thin-film layer.