OVD CONTAINING DEVICE

摘要

A holographic overlay is formed using casting a diffractive structure upon a first side of a polycarbonate substrate, and providing a reflection-enhancing coating on at least a part of the diffractive structure. A second side of the substrate provides a substantially flat external surface of the overlay capable of fusing to a conforming surface in the presence of heat and pressure without an adhesive. Optionally, the overlay is laser-engraved so as to form ablated voids in the metal coating and carbonize the laser engravable polycarbonate under the ablated voids.