Fingerprint Recognition Mis-touch Prevention via Surrounding Touch Detection
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Solution Overview
Problem
Fingerprint recognition systems in electronic devices often mis-recognize touch inputs due to mis-touching, leading to power wastage, frequent incorrect recognition, and failure to unlock the device when the correct finger is used, as the capacitance changes from accidental contacts, such as when a phone is in a pocket or from accidental touches.
Innovation Solution
A method that collects touch information from a designated area around the fingerprint collection area when recognition fails, determines if the touch operation is a mis-touch by checking if the designated area satisfies a preset touch condition, and prohibits the execution of a fingerprint recognition failure operation to avoid power wastage and incorrect recognition accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the fingerprint sensor continuously scans for fingerprint recognition, then the recognition speed is improved, but the power consumption increases
Solution Approach 1:
The system performs fingerprint scanning periodically or on-demand rather than continuously. The touch screen controller scans the fingerprint sensor only when touch input is detected, and stops scanning when no touch is present, thereby reducing power consumption while maintaining recognition capability when needed.
2Measurement precision
If the fingerprint recognition system scans all touch inputs, then the recognition accuracy is improved, but the mis-recognition of accidental touches increases
Solution Approach 1:
The system applies different scanning strategies to different touch scenarios. When a touch is detected within the fingerprint sensor area, a full fingerprint recognition scan is performed. When touch is detected outside this area or no touch is present, scanning is reduced or stopped, thereby avoiding mis-recognition of accidental touches while maintaining accuracy for genuine fingerprint inputs.
3Speed
If the fingerprint sensor scans frequently, then the response time is improved, but the system complexity increases
Solution Approach 1:
The scanning frequency and intensity of the fingerprint sensor are dynamically adjusted based on touch detection status. The system transitions between different operational states (scanning mode, standby mode, sleep mode) depending on whether touch input is detected, thereby achieving fast response when needed while reducing complexity and power consumption during idle periods.
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 reduces power consumption by limiting scanning to only when necessary, prevents unnecessary fingerprint recognition attempts, and ensures normal unlocking functionality by distinguishing genuine fingerprint inputs from mis-touches, thereby enhancing user experience and device security.
Implementation Method 1
the capacitance changes from accidental contacts
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1F
AI summary
A method of recognizing a fingerprint, an electronic device and a non-transitory machine-readable storage medium are provided in the present disclosure. The method includes: touch information on a designated area within a touch screen of an electronic device is obtained when a fingerprint recognition fails, where a distance between the designated area and a fingerprint collection area of the fingerprint recognition is within a designated range; and a fingerprint recognition failure operation is prohibited from being executed when the touch information indicates that the designated area satisfies a preset touch condition.