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Active metameric security devices using an electrochromic material.

Bill Baloukas¹, Jean-Michel Lamarre, Ludvik Martinu

¹Department of Engineering Physics, École Polytechnique de Montréal, Montréal, Québec, Canada.

|April 5, 2011

Summary

This study introduces an active electrochromic security image for enhanced anticounterfeiting. The dynamic device, using metamerism, creates hidden images for a second authentication level, improving security features.

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Area of Science:

Optics
Materials Science
Security Technology

Background:

Current interference security images lack advanced anticounterfeiting measures.
Metamerism-based security features offer potential for enhanced authentication.

Purpose of the Study:

To develop an active security image using electrochromic materials for improved anticounterfeiting.
To integrate metamerism for dynamic optical effects and a second authentication level.

Main Methods:

Implementation of an electrochromic material as an active component in security image structures.
Design of optical filters to match bleached and colored states of the electrochromic device.
Development of a design methodology for metameric filters based on human eye's luminous efficiency curve.

Main Results:

Successful creation of hidden images appearing/disappearing based on device state and tilt.
Demonstration of fabrication flexibility due to the dynamic nature of the electrochromic device.
Achieved filters with fewer layers, lower cost, and reduced color difference sensitivity.

Conclusions:

The proposed electrochromic security image offers a novel, complex, and dynamic anticounterfeiting solution.
The metamerism-based approach enhances security through multiple authentication levels.
The filter design methodology optimizes performance and reduces manufacturing costs.