Thin-Film Optical Layer Structure for Electronic Element Authentication
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Solution Overview
Problem
Current methods for protecting electronic devices from counterfeiting are inadequate, as they often require additional printing steps and can be easily defeated by counterfeiters, and there is a need for embedded information that is co-located with electronic devices using the properties of transparent thin-films without additional process steps.
Innovation Solution
A method for decoding a pattern of information embedded in thin-film electrical elements by forming an optical layer structure with overlapping layers that contribute to both electrical function and an optically-detectable interference image, allowing for the detection of embedded information using incident light and image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If additional printing steps are used to embed information in electronic devices, then information can be added, but the process becomes more complex and easier to counterfeit
Solution Approach 1:
The patent combines the information encoding pattern directly into the thin-film layer structure during the existing manufacturing process. The encoding pattern is formed by varying the thickness of thin-film layers (e.g., dielectric or semiconductor layers) rather than adding separate printing steps. This merging of information embedding into the core fabrication process reduces complexity while preventing counterfeiting, as the information is now integral to the device structure itself.
2Reliability
If information is embedded in electronic devices, then authentication capability is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent implements authentication capability by forming the encoding pattern during the preliminary stages of thin-film deposition, before the device is completed. The information is embedded by controlling the thickness of layers during the initial fabrication sequence, allowing authentication to be built-in from the start rather than added as a post-processing step. This preliminary action maintains manufacturing simplicity while ensuring reliable authentication.
3Loss of information
If separate printing steps are used to add indicia, then information can be embedded, but the process is easily defeated by counterfeiters
Solution Approach 1:
The patent applies local quality by varying the thickness of thin-film layers in specific regions to create the encoding pattern. Different areas of the device have different layer thicknesses that correspond to different information states (e.g., presence or absence of material, different optical properties). This localized variation in material properties creates authentication information that is difficult to replicate, as counterfeiters would need to precisely reproduce the local thickness variations throughout the thin-film structure, not just print surface indicia.
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 method provides an effective image authentication feature to detect counterfeit electrical elements and allows access to information or control of the electrical element, while being cost-effective and process-efficient by integrating information-encoding patterns directly into existing thin-film layers.
Implementation Method 1
overlapping in an encoding region to form an optical layer structure... producing an optically-detectable interference image
Data Source
AI summary
A pattern of information is detected in a thin-film electrical element including a plurality of thin-film layers on a substrate, the plurality of thin-film layers overlapping in an encoding region to form an optical layer structure. At least one of the thin-film layers in the optical layer structure includes an embedded information-encoding pattern. The thin-film electrical element is illuminated with an incident light beam from a light source thereby producing an optically-detectable interference image including the embedded pattern of information. An image capture system is used to capture an image of the optically-detectable interference image, and a data processing system is used to analyze the captured image to detect the embedded pattern of information. One or more actions are initiated in response to the detected pattern of information.