Abstract: There is provided a Fresnel lens structure including: a Fresnel lens layer; and a planarization layer disposed on the Fresnel lens layer, any one of the Fresnel lens layer and the planarization layer being formed of a birefringent material and the other being formed of an isotropic material having a refractive index equal to a highest refractive index or a lowest refractive index of the birefringent material. In the Fresnel lens structure, a 2/3D image switching structure is simplified and switching thereof is easy. 2/3D switching can be performed without using an apparatus with complicated structure, whereby a stereoscopic image display apparatus structure may be simplified and manufacturing costs may be reduced as compared with a lenticular lens by using a Fresnel shaped lens structure.

Abstract: There is provided a process of making a mold for optical films. The process of making a mold for optical films comprises: etching a stereostructure in a surface of the mold having a flat surface or an engraved convex and concave surface, by using a laser beam. The process of making a mold for optical films may be useful to easily mark spots, to control the height of protrusions and the position where the protrusions are formed, and also to form the protrusions having constant depths even in a curved surface such as a convex and concave surface.

Abstract: There is provided a process of making a mold for optical films. The process of making a mold for optical films comprises: etching a stereostructure in a surface of the mold having a flat surface or an engraved convex and concave surface, by using a laser beam. The process of making a mold for optical films may be useful to easily mark spots, to control the height of protrusions and the position where the protrusions are formed, and also to form the protrusions having constant depths even in a curved surface such as a convex and concave surface.