PA28 Application of texture in a planar cell of UV-curable nematic liquid crystal for security device

Abstract

We have proposed a security device that uses the random pattern of a chiral nematic liquid crystal for unique identification information. In this study, we studied the application of the random texture of a nematic liquid crystal. Random schlieren texture is observed in a planar cell of the nematic liquid crystal. Using an ultraviolet-curable liquid crystal, many films with an unique random pattern can be fabricated by photopolymerization without a process for making the unique information. These random patterns of shlieren in each cell can be used as identifiers.