IMPROVEMENTS IN FORMING SECURITY DEVICES

摘要

The present invention relates to improvements in forming security devices on substrates that can be used in varying shapes and sizes for various authenticating or security applications, particularly an optically variable security device utilising liquid crystal materials. The invention comprises a method of forming a customisable security device, comprising the steps of forming on a base substrate a liquid crystal layer, an at least partially absorbing layer overlapping with at least a part of one side of the liquid crystal layer, and at least one customising region overlapping at least a part of an opposite side of the liquid crystal layer in selected regions. The customising region modifies the appearance of the liquid crystal layer such that contrasting regions are provided between those regions covered by the customising region and those not covered by the customising region, and the customising region is applied after application of the security device to the substrate.