Patent ID: 8917363

Claim:
An anti-peeping privacy device, comprising: a polarizing element for polarizing the incident light to the polarized light; a liquid crystal member disposed on the polarizing element, comprising two transparent substrates, liquid crystals interposed therebetween and a driving unit for controlling the direction of the polarized light; and a diffusing element disposed on the liquid crystal member, comprising a transparent resin layer having a refractive index and adjacent to the liquid crystal member, comprising a plurality of concave-convex stripe microstructures on the top side thereof, wherein the concave-convex stripe microstructures are arranged in a direction substantially orthogonal to the polarized light; and a liquid crystal layer disposed on the concave-convex stripe microstructures of the transparent resin layer, the liquid crystal layer having an extraordinary refractive index parallel to the arrangement direction of concave-convex stripe microstructures and an ordinary refractive index orthogonal to the arrangement direction of concave-convex stripe microstructures, wherein the extraordinary refractive index and the ordinary refractive index of the liquid crystal layer are different and the refractive index of the transparent resin layer is substantially the same as the ordinary refractive index of the liquid crystal layer.