Patent ID: 7719657
Filing Date: 2010-05-18
Classification: G02B,G02F,G11B

Abstract:
1. A liquid crystal lens element comprising a pair of opposing transparent electrodes and a liquid crystal layer sandwiched between these transparent electrodes, wherein a converging point of light transmitted through the liquid crystal layer is changed according to a magnitude of voltage applied to the liquid crystal layer; the liquid crystal lens element being characterized in that the liquid crystal lens element comprises a Fresnel lens formed on a flat surface of one of the transparent substrates opposed to the other substrate, a first transparent electrode formed on a concave-convex shaped surface of the Fresnel lens, and a second transparent electrode formed on a flat surface of said other transparent substrate opposed to said one of the transparent substrate; according to a voltage V applied between the first transparent electrode and the second transparent electrode sandwiching the liquid crystal layer, substantial refractive index n(V) of the liquid crystal layer for linearly polarized incident light having a predetermined wavelength λ changes from a refractive index n