Dual Interface Smart Card Segmentation
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Solution Overview
Problem
Biometric dual interface fingerprint smart cards are expensive and difficult to produce due to non-standard components like printed circuit boards and flexible inlay layers, which are necessary for connecting security elements to both contact and contactless interfaces.
Innovation Solution
A biometric dual interface smart card design featuring a standard chip for contact-based transactions and a high-power security chip for contactless transactions, with the two chips being electrically insulated, allowing for simplified production using conventional tools and reducing the need for complex electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a security element is connected both to an antenna and to the ISO contact area with biometric fingerprint card sensor, then biometric dual interface fingerprint smart card functionality is achieved, but production becomes expensive and difficult due to nonstandard components
Solution Approach 1:
The patent divides the smart card into two separate standard interfaces: a contact interface (ISO 7816) with a standard chip and a contactless interface (NFC) with a separate security element and antenna. Each interface operates independently with its own standard components, eliminating the need for complex custom connections while maintaining dual interface functionality.
Solution Approach 2:
The patent extracts the security element from the conventional integrated design and places it in a separate encapsulation above the antenna. This separation allows the security element to be connected only to the antenna for contactless transactions, while the standard chip handles contact-based transactions, simplifying the overall production process.
2Adaptability or versatility
If nonstandard components like printed circuit boards and flexible inlay layers are used to connect security elements, then dual interface functionality is achieved, but production cost increases and conventional production tools cannot be used
Solution Approach 1:
The patent employs universally standard components for both contact and contactless interfaces. The standard chip and standard antenna can be produced using conventional production tools and processes, eliminating the need for specialized nonstandard components while maintaining full dual interface functionality.
3Adaptability or versatility
If electrically conductive connections are made between chip and security element, then functional integration is achieved, but production difficulty and cost increase
Solution Approach 1:
The patent segments the electrical connections into two independent paths: the standard chip connects to contact terminals for contact-based transactions, while the security element connects only to the antenna for contactless transactions. This segmentation eliminates the need for complex interconnections between the chip and security element.
Solution Approach 2:
The patent introduces an electrically insulating encapsulation material that surrounds the security element and antenna. This intermediary material provides electrical insulation, allowing the security element to be positioned above the antenna without requiring direct electrical connections to the standard chip, thereby simplifying production.
Data Source
AI summary
A dual interface smart card having a smart card body, a contact-based interface for contact-based communications, a first security chip which is arranged in the smart card body and is electrically conductively coupled to the contact-based interface, a fingerprint sensor arranged in the smart card body, a second security chip, which is coupled to the fingerprint sensor and is configured to carry out a fingerprint verification by means of fingerprint signals detected by the fingerprint sensor, and an antenna coupled to the second security chip.