Leonhard Kurz Stiftung & Co Kg

Polyic Gmbh & Co Kg

Steffen Weiss

Klaus Ludwig

Ulrich Schindler

Rainer Stahl

Johannes Schad

Gerrit Hackl

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 &#x3bc;m in a direction perpendicular to the plane of the film body.

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

There is described a process for the production of LCDs, in particular PDLCDs, preferably in a roll-to-roll process, wherein in a first process step a first contact layer () and a first electrode layer () spaced therefrom is applied to a base carrier (). A first and a second delimitation layer () is then applied to the base carrier (). Thereafter a functional layer () comprising a PDLCD mixture provided in a porous support matrix is applied between the first and second delimitation layers (and). A protective layer () is then applied to the functional layer () between the first and second delimitation layers (and) and finally there is applied to the protective layer () a second electrode layer () which is contacted with the first contact layer ().

Process for the production of LCDs

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Nuremberg, Germany

Steffen Weiss