Patent · US Active

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

US8896501B2 · kind B2 · utility

6Cited by

12References

34Claims

0Family size

Assignee

PolyIC GmbH & Co. KG · DE

Inventors

Rainer Stahl · Nuremberg, DE
Gerrit Hackl · Nuremberg, DE
Steffen Weiss · Eindhoven, NL
Klaus Ludwig · Erlangen, DE
Johannes Schad · Fürth, DE

Key dates

Filing date	Sep 16, 2008
Grant date	Nov 25, 2014
Priority date	—
Expiry date	Mar 19, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/133305
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.