Cholesteric Liquid Crystal Reflectors for Secure Authentication
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Solution Overview
Problem
Current authentication methods, such as QR codes and RFID tags, are vulnerable to cloning and lack robustness, making it difficult to securely and reliably verify the authenticity and provenance of products, especially in complex supply chains, where counterfeiting and unethical production practices pose significant risks.
Innovation Solution
Integration of cholesteric liquid crystal reflectors into articles as a physical unclonable function (PUF) tag, which provides a unique fingerprint that can be probed by incident light, allowing for secure authentication by matching the expected response stored in a database, and can be camouflaged within the article's décor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard QR codes or RFID tags are used for authentication, then the authentication system is simple and cost-effective, but the system is vulnerable to cloning and lacks robustness
Solution Approach 1:
The patent changes the physical parameters of the authentication tag by using cholesteric liquid crystal reflectors with specific pitch values (400-700 nm) that determine their color reflection properties. These physical parameters create unique optical fingerprints that are difficult to replicate, thereby improving authentication security while maintaining a relatively simple tag structure
Solution Approach 2:
The patent employs composite material structures combining cholesteric liquid crystal particles embedded in a transparent matrix material. This composite approach creates tags with unique optical properties that are both secure against cloning and can be manufactured using existing processes, balancing reliability and complexity
2Reliability
If cholesteric liquid crystal reflectors are integrated into articles, then a unique unclonable identifier is provided, but the tag must remain camouflaged and not disrupt the article's décor
Solution Approach 1:
The patent applies local quality by making the cholesteric liquid crystal reflectors visually imperceptible under normal viewing conditions while maintaining their optical authentication properties. The reflectors are designed to match the surrounding décor colors, allowing them to be embedded in visible surfaces without disrupting the aesthetic appearance, thus facilitating easier integration into articles
Solution Approach 2:
The patent utilizes the color-changing properties of cholesteric liquid crystals, which reflect specific wavelengths of light based on their pitch. By tuning the pitch to reflect colors that match the article's décor, the tags become camouflaged under normal lighting conditions, making them easy to integrate without visual disruption while still providing unique authentication signatures
3Reliability
If multiple authentication layers are combined (QR code + hologram + OVD), then authentication security is improved, but the device complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The patent extracts the essential authentication function from complex multi-layer systems and implements it through a single layer of cholesteric liquid crystal reflectors. Each reflector's unique position, size, and optical properties create an unclonable pattern that provides equivalent or superior security without requiring multiple physical layers, thereby reducing device complexity while maintaining reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cholesteric liquid crystal reflectors offer a secure and reliable authentication method that is difficult to clone, maintaining the article's décor integrity and providing a unique identifier, enhancing supply chain integrity and product authenticity verification.
Implementation Method 1
a tag comprising an arrangement of cholesteric liquid crystal spherical reflectors
Implementation Method 2
The cholesteric liquid crystal reflectors offer a secure and reliable authentication method that is difficult to clone
Data Source
AI summary
An article having a decor provided by one or more exposed layers is disclosed. The article comprises a tag integrated in the one or more exposed layers yet camouflaged in the decor to the naked human eye, the tag comprising an arrangement of spherical cholesteric liquid crystal reflectors. In addition, methods for providing an authenticable article and for authenticating an article as well as a communication method are disclosed.