De La Rue International Limited

Adam Jeacock

Robert Whiteman

Lawrence George Commander

Carole Lesley Foster

Lawrence Commander

The present invention relates to improvements in security devices that can be used in varying shapes and sizes for various authenticating or security applications, particularly an optically variable security device utilizing liquid crystal materials. The security device includes a liquid crystal layer (), an at least partially absorbing layer () adjacent at least a part of one side of the liquid crystal layer (), and at least one customizing region () which is adjacent at least a part of an opposite side of the liquid crystal layer () to the absorbing layer () in selected regions. The at least one customizing region () modifies the color shifting properties of the liquid crystal layer () such that at least two contrasting optically variable regions are provided by the regions covered by the at least one customizing region and regions not covered by the at least one customizing region.

Substrates

A security device comprises a substrate having a viewing region. A first pattern of a first color and a second pattern of a second color are printed on one side of the viewing region. A third pattern of the first color and a fourth pattern of the second color are printed on the other side of the viewing region. The first and second patterns on the one side of the viewing region overlap the fourth and third patterns respectively on the other side of the viewing region whereby

Growing community of inventors

Southampton, United Kingdom

Adam Jeacock