Security element for the identification of a security document using liquid crystal display driven with piezoelectric energy source and method for producing it

摘要

The invention relates to a security element for the identification of a security document, in particular a banknote, a valuable paper or a paper document, comprising at least one electrically controllable display element and at least one piezoelectric energy source which controls the at least one display element. The security element is formed by a flexible multilayered film body comprising the at least one electrically controllable display element containing a display layer having liquid crystals that can be oriented in an electric field, and comprising the at least one piezoelectric energy source which controls the at least one display element and has at least one layer composed of piezoelectric material, wherein the security element has a thickness of at most 70 μm in a direction perpendicular to the plane of the film body.

主权项

1. A security element for the identification of a security document comprising:
a flexible multilayered film body defining a plane comprising: at least one electrically controllable display element; and at least one piezoelectric energy source which controls the at least one display element and having at least one layer of piezoelectric material; the at least one electrically controllable display element containing a display layer having liquid crystals that orient in response to an applied electric field; the multilayered body having a thickness of at most 70 μm in a direction perpendicular to the plane of the film body; wherein the film body includes a first carrier film and a first electrode layer, the at least one layer composed of piezoelectric material being on the first electrode layer, said display layer being coplanar with the piezoelectric material on the first electrode layer, the body including a transparent adhesive layer, a transparent second electrode layer, and a transparent protective layer formed by a second carrier film or a protective lacquer layer; and a supporting layer for the display layer forming a frame around the display element as viewed perpendicular to the plane of the film body; the supporting layer forming at least one web, which web overlaps the display layer, and which supporting layer, when viewed perpendicular to the first carrier film, forms a linear, punctiform, or areal structure, the supporting layer being arranged to contribute to the mechanical stabilization of the display element.