Capacitive Data Carrier Positioning on Touchscreen
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Solution Overview
Problem
Existing methods for interacting portable data carriers with end devices are inflexible and lack secure, automated verification, particularly in determining the type of data carrier and ensuring precise superimposition for security checks.
Innovation Solution
A method utilizing capacitive transducer elements on the data carrier and a capacitive display screen in the end device for precise positioning and bidirectional communication, enabling secure and flexible interaction through a contactless interface with an autonomous energy supply, and potentially a back channel for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a window element with structure information item is placed over a display screen for verification, then security verification is enabled, but precise superimposition is difficult to achieve and automated identification is not possible
Solution Approach 1:
The patent replaces manual mechanical placement and visual alignment of window elements with an automated optical scanning system. The end device uses optical sensors and image processing to automatically detect, identify, and align verification elements on the data carrier, eliminating the need for manual superimposition while maintaining high precision through digital image correlation algorithms.
Solution Approach 2:
The patent creates a digital copy or representation of the physical data carrier's verification elements through optical scanning. The end device captures an image of the window element and structure information item, then processes this digital copy to achieve precise alignment and verification, replacing the need for physical superimposition with digital image matching.
2Reliability
If manual verification methods are used for data carriers, then security checks can be performed, but automated identification of data carrier type is not possible
Solution Approach 1:
The patent enables the data carrier to automatically present its identification information to the end device through optical scanning. The verification elements on the data carrier are designed to be automatically detected and read by the end device's optical sensors, allowing the system to self-identify the data carrier type without manual intervention while maintaining secure verification.
3Measurement precision
If capacitive transducer elements are used for positioning, then precise positioning and bidirectional communication are enabled, but device complexity increases
Solution Approach 1:
The patent makes the capacitive transducer elements perform multiple functions: they serve as positioning sensors to detect the data carrier's location on the display screen, and simultaneously as communication interfaces for bidirectional data exchange between the end device and data carrier. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity despite the added precision capabilities.
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
Enables precise positioning of the data carrier on the end device's screen for enhanced security checks and facilitates secure transactions by allowing automated verification and bidirectional communication, improving the flexibility and security of interactions.
Implementation Method 1
A data carrier (1) comprises a transducer arrangement (10) having at least one or a set of capacitive transducer elements (11, 12, 13, 14)
Implementation Method 2
an end device determines the exact position of a data carrier on the display screen and generates a display which is exactly coordinated with said position
Data Source
AI summary
A method is provided for interaction of a portable data carrier with an end device. The data carrier comprises a transducer arrangement having at least one or a set of capacitive transducer elements which are arranged on or in the data carrier at defined positions in relation to the geometry of the data carrier, at least one contactless interface, and a dedicated energy supply. The end device comprises a capacitive display screen having a touch-sensitive display, wherein the data carrier generates via the capacitive transducer elements signals which, when the data carrier is placed onto the display screen, are picked up by the display screen of the end device and evaluated as input signals through the end device.