Fingerprint Sensor Power Control via Data Pattern Analysis
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Solution Overview
Problem
Existing fingerprint sensors in portable devices face challenges in minimizing power consumption, particularly when encountering pseudo inputs, leading to unnecessary power usage and reduced battery life.
Innovation Solution
A method is introduced to control the power supply of fingerprint sensors by determining whether received sensor data is a fingerprint form of data and assessing changes over time, allowing the sensor to enter a power saving mode if it's a pseudo input or if there's minimal activity, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint sensor continuously monitors and processes sensor data to ensure accurate fingerprint recognition, then the recognition accuracy is improved, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts the operational state of the fingerprint sensor based on real-time analysis of sensor data characteristics. By switching between active monitoring mode and power-saving mode according to the detected patterns, the system optimizes the balance between recognition accuracy and power consumption without compromising security
Solution Approach 2:
The system changes operational parameters by detecting changes in sensor data over time. When the rate of change in sensor data falls below a threshold, indicating a pseudo-input, the system transitions to power-saving mode. This parameter-based detection enables intelligent power management while maintaining accurate fingerprint recognition when needed
2Reliability
If the fingerprint sensor processes all sensor data as potential fingerprint inputs, then the security is improved, but the power consumption increases due to unnecessary processing
Solution Approach 1:
The system performs preliminary analysis of sensor data characteristics before full fingerprint processing. By first determining whether the input resembles a fingerprint pattern and checking for temporal changes, the system pre-filters out pseudo-inputs and only processes data that appears to be genuine fingerprint attempts, reducing unnecessary processing while maintaining security
Solution Approach 2:
The system continuously monitors the rate of change in sensor data and uses this feedback to determine whether to process the input as a fingerprint. This feedback mechanism allows the system to adjust its processing behavior in real-time, processing only when the sensor data exhibits characteristics consistent with actual fingerprint inputs
Data Source
AI summary
A method of controlling power supply for a fingerprint sensor is provided. The method includes receiving sensor data obtained from the fingerprint sensor; determining whether the received sensor data is a fingerprint form of data; if the received sensor data is the fingerprint form of data, determining an amount of change in sensor data received over a predetermined time is greater than or equal to a predetermined value; and if the received sensor data is not the fingerprint form of data or if the received sensor data is the fingerprint form of data but an amount of change in the received sensor data is less than the predetermined value, allowing the fingerprint sensor to enter a power saving mode.