Fingerprint Sensor Error Prompting via Abnormal Pixel Detection
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Solution Overview
Problem
Fingerprint recognition failures in terminal apparatuses, such as smartphones and computers, can occur due to damaged pixel units in fingerprint identification sensors, leading to inaccurate fingerprint images and potential security hazards.
Innovation Solution
A method is implemented to determine the number of sensors with abnormally-changing electrical signals in a fingerprint recognizer, prompting a failure when the threshold is exceeded, and generating a corrected fingerprint image by removing abnormal pixels to improve recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fingerprint recognition is performed using a sensor array, then fingerprint identification capability is enabled, but damaged pixel units cause recognition failures and security hazards
Solution Approach 1:
The system performs preliminary detection of abnormal electrical signals from damaged pixel units before conducting fingerprint recognition. By identifying and marking these defective pixels in advance, the system prevents them from affecting recognition accuracy, thus resolving the contradiction between enabling fingerprint identification and preventing recognition failures from damaged pixels
Solution Approach 2:
The system extracts and removes the influence of damaged pixel units from the fingerprint recognition process. By detecting abnormal signals and excluding these defective pixels from the recognition calculation, the system eliminates the harmful effect of damaged pixels while maintaining the overall fingerprint identification capability
2Productivity
If damaged pixel units are not detected, then the system operates continuously, but recognition accuracy deteriorates due to abnormal electrical signals
Solution Approach 1:
The system implements a feedback mechanism that continuously monitors electrical signals from sensor units during fingerprint recognition. When abnormal signals are detected, the system provides feedback to identify and exclude the corresponding damaged pixels, thereby maintaining recognition accuracy without significantly impacting overall throughput
Data Source
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AI summary
A method of prompting a failure or error, applicable to a terminal apparatus including a fingerprint recognizer having a sensor array, includes: obtaining electrical signals containing fingerprint information through the sensor array upon a fingerprint recognition being triggered; determining a number of sensors with abnormally-changing electrical signals in the sensor array; and outputting prompt information upon the determined number of sensors exceeds a number threshold.