Capacitive Information Carrier Encoding via Multilayer Conductive Patterns
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Solution Overview
Problem
Existing information carriers using capacitive touchscreens face challenges with counterfeiting, require specialist devices, and are limited by non-conductive substrates and awkward user interaction, while also lacking in information density and material cost-effectiveness.
Innovation Solution
The use of a multilayer electrically conductive pattern on a substrate with varying capacitance values, where the pattern elements have different conductivities and dielectric coefficients, allowing information encoding through capacitance measurements on standard capacitive touchscreens, and the use of transparent conductive materials for anti-counterfeiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual barcodes are used for information encoding, then readability with standard devices is improved, but susceptibility to counterfeiting increases
Solution Approach 1:
The patent replaces visual optical detection with electrical capacitance detection. Instead of using visible patterns that can be easily copied, the invention uses conductive and non-conductive regions that create electrical fields detectable by capacitive sensors, substituting optical recognition with electrical field-based recognition that is harder to counterfeit.
Solution Approach 2:
The patent changes the detection parameter from visual/optical properties to electrical capacitance properties. By encoding information in the capacitance values of different regions rather than visual patterns, the system achieves both readability with standard capacitive devices and resistance to counterfeiting, as capacitance values cannot be visually inspected or easily replicated.
2Ease of manufacture
If non-conductive substrates are used for capacitive information carriers, then manufacturing simplicity is improved, but substrate material choices are limited
Solution Approach 1:
The patent employs composite material structures combining both conductive and non-conductive materials in specific patterns. This allows the information carrier to work with diverse substrate materials (conductive, non-conductive, or mixed) while maintaining capacitive functionality, as the patterned regions create the necessary electrical characteristics regardless of the base substrate type.
3Reliability
If physical contact is required for reading the information carrier, then capacitive coupling is achieved, but user convenience deteriorates
Solution Approach 1:
The patent introduces an intermediary conductive layer or coupling region that facilitates capacitive coupling between the information carrier and the user's finger. This intermediary structure ensures reliable electrical contact while maintaining ease of use, as users naturally interact with the surface without needing to apply specific pressure or maintain precise contact points.
4Reliability
If specialist reading devices are used, then information security is improved, but device cost and accessibility increase
Solution Approach 1:
The patent designs the information carrier to be readable by universal capacitive touchscreens that are already widespread in smartphones and tablets. By using the existing capacitive sensing capability of common devices rather than requiring specialized readers, the system achieves information security through capacitance-based encoding while maintaining low cost and high accessibility.
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
This approach enhances robustness against counterfeiting, simplifies user interaction, allows encoding on a wider range of substrates, and reduces material costs, enabling higher information density and effective reading by standard touchscreen technology without the need for physical contact.
Implementation Method 1
the pattern is configured to have different capacitance values at different parts of the electrically conductive pattern when placed on a capacitive touchscreen
Implementation Method 2
the pattern elements have different conductivities and dielectric coefficients
Implementation Method 3
the pattern elements have different conductivities and dielectric coefficients
Data Source
AI summary
The present invention relates to a method of encoding information on an information carrier, the method involving providing the information carrier with an electrically conductive pattern on a substrate, wherein the pattern is configured to have different capacitance values at different parts of the electrically conductive pattern when placed on a capacitive touchscreen, wherein information is encoded based on said different capacitance values. Also provided are information carriers, and methods of reading information from such carriers. In preferred embodiments, the pattern comprises multiple pattern elements, and one or more of the pattern elements is a multilayer structure having a lower layer and an upper layer, wherein the conductivity of the upper layer is greater than that of the lower layer.