Ultrasonic Fingerprint Sensing With Adaptive Echo Accumulation
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Solution Overview
Problem
Ultrasonic signals experience significant loss and noise fluctuations when propagating through conductive mediums, affecting the stability and accuracy of fingerprint detection in varying usage scenarios.
Innovation Solution
The method involves determining the number of ultrasonic emission times based on the current temperature and/or film application state of the conductive medium, emitting ultrasonic signals multiple times, and superimposing echo signals to enhance the accumulated sum signal for fingerprint detection, ensuring the intensity remains within a certain range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic signals are emitted through conductive mediums for fingerprint detection, then fingerprint detection can be performed, but the ultrasonic signals experience significant loss and noise fluctuations affecting detection stability
Solution Approach 1:
The patent applies periodic action by emitting ultrasonic signals multiple times (n times) rather than a single emission. The system performs repeated ultrasonic emissions and accumulates the echo signals, which helps to average out noise fluctuations and maintain stable detection despite signal loss through the conductive medium.
Solution Approach 2:
The patent merges multiple echo signals by accumulating them together. The system collects n echo signals from n repeated ultrasonic emissions and accumulates these signals to form a stronger, more reliable detection signal, thereby compensating for the energy loss in the conductive medium.
2Measurement precision
If the number of ultrasonic emission times is increased to reduce noise influence, then detection accuracy improves, but the detection time increases
Solution Approach 1:
The patent applies partial action by determining an appropriate number of ultrasonic emission times (n times) based on current temperature and film application state, rather than continuously increasing emissions. The system uses mapping relationships to select the optimal number of emissions needed to achieve sufficient signal accumulation without excessive time consumption.
Solution Approach 2:
The patent makes the number of ultrasonic emission times dynamic by adjusting it according to current temperature and film application state. The system uses different mapping relationships (first mapping for temperature, second mapping for film state) to dynamically determine the optimal emission count, balancing detection accuracy with time efficiency under different conditions.
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 significantly reduces noise influence and maintains fingerprint detection accuracy by enhancing the intensity of the accumulated sum signal, improving the stability of fingerprint detection across different temperature and film application scenarios.
Implementation Method 1
ultrasonic signals are emitted by the ultrasonic sensors to the conductive mediums, and echo signals of the ultrasonic signals are received
Implementation Method 2
echo signals of the ultrasonic signals are received
Data Source
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AI summary
Embodiments of the present disclosure provide a method and apparatus for detecting a fingerprint with ultrasonic waves, an electronic device and a storage medium. The method for detecting a fingerprint with ultrasonic waves includes: acquiring a current temperature and/or a current film application state of a conductive medium, where a first side surface of the conductive medium is attached to an ultrasonic sensor, and a second side surface of the conductive medium provides a pressing surface; determining a number of ultrasonic emission times n based on the current temperature and/or the current film application state, where n is a positive integer; controlling the ultrasonic sensor to emit ultrasonic signals n times to the conductive medium, and receiving an echo signal formed after each emitted ultrasonic signal is reflected; and performing fingerprint detection based on the echo signal. The embodiments of the present disclosure may significantly reduce the impact of noise on fingerprint detection, and ensure the stability of fingerprint detection accuracy, so as to improve the performance of fingerprint detection.