Fingerprint Detection Device with Stability Filtering
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Solution Overview
Problem
Fingerprint authentication accuracy is compromised when a finger is moving during the authentication process, leading to increased authentication failures and time losses due to the inability of existing touch and fingerprint detection systems to effectively differentiate between stable and unstable finger positions.
Innovation Solution
A detection device and method that alternately determine touch detection and fingerprint detection durations, calculating the difference in finger coordinates before and after fingerprint acquisition, and discarding images with significant coordinate changes, ensuring only stable fingerprint images are used for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fingerprint detection is performed at the timing of authentication request, then authentication process can be completed, but authentication accuracy decreases when finger is moving
Solution Approach 1:
The system performs preliminary finger position detection before fingerprint acquisition by continuously monitoring touch panel coordinates. This preliminary action allows the system to assess finger stability before committing to fingerprint capture, ensuring that only stable fingerprints are acquired, thereby maintaining high accuracy without sacrificing authentication speed
Solution Approach 2:
The system implements feedback by comparing finger coordinates detected before and after fingerprint acquisition. When the coordinate difference exceeds a threshold, indicating finger movement, the system discards the fingerprint image and requests re-acquisition. This feedback mechanism ensures authentication accuracy by eliminating blurred fingerprints while maintaining efficient processing
2Reliability
If fingerprint acquisition request is repeated after authentication failure, then authentication can be attempted again, but time loss increases and authentication ratio decreases
Solution Approach 1:
By performing preliminary finger stability assessment through coordinate detection before fingerprint acquisition, the system prevents unnecessary re-acquisitions. This preliminary check ensures that only stable fingerprints are captured, reducing authentication failures and minimizing time loss while improving overall authentication success rate
Solution Approach 2:
The coordinate comparison feedback mechanism provides real-time information about finger stability. When stability is confirmed (coordinate difference within threshold), the system proceeds with acquisition, avoiding wasted time on unstable captures. This feedback-driven approach optimizes the balance between authentication reliability and time efficiency
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 authentication accuracy by filtering out unstable fingerprint images, reducing authentication failures and improving overall accuracy and efficiency.
Implementation Method 1
the shape of a fingerprint of a finger contacting a detection device is detected by detecting capacitance change according to concavity-convexity of the fingerprint
Data Source
AI summary
A detection device includes a sensor unit, a detector configured to receive an output from a sensor, a detection controller configured to drive and control the sensor unit and the detector, and a processor configured to perform processing in accordance with an output from the detector. The detection controller drives the sensor unit and the detector and determines a touch detection duration in which a coordinate of a finger contacting or nearby the sensor unit is detected, and a fingerprint detection duration in which a fingerprint image of the finger is detected.