Biometric Sensor Finger Placement Guidance
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Solution Overview
Problem
Existing electronic devices face challenges in accurately measuring biometric information due to improper finger placement on bio sensors, such as photoplethysmography (PPG) sensors, which affects the accuracy of heart rate and other physiological parameter measurements.
Innovation Solution
The electronic device employs a method that includes emitting light through a light emitter, receiving reflected light with a light receiver, and providing guide information to ensure accurate finger placement on the bio sensor by determining signal correlation levels, thereby ensuring proper sensor alignment and enabling accurate biometric data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic device provides biometric measurement function without finger placement guidance, then the device complexity is reduced, but the measurement precision deteriorates due to improper finger placement
Solution Approach 1:
The system provides real-time feedback to the user about finger placement quality by analyzing the acquired signal. When the signal quality indicates improper placement, the system guides the user to adjust their finger position until the measurement meets the required quality standards, thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The system uses the signal already being acquired for biometric measurement to simultaneously assess finger placement quality. The same PPG sensor data is analyzed for both the biometric information and the placement quality indicator, allowing the system to self-evaluate and guide correction without requiring separate sensing mechanisms
2Measurement precision
If the electronic device adds signal quality assessment and guidance functions, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The existing PPG sensor and signal processing infrastructure is used for dual purposes: both acquiring biometric information and assessing finger placement quality. The same hardware components perform multiple functions, avoiding the need for additional dedicated sensors or complex placement detection mechanisms
Solution Approach 2:
The system evaluates different signal parameters (amplitude, waveform characteristics, signal-to-noise ratio) to determine placement quality. By analyzing changes in these signal parameters, the system can infer placement accuracy and provide guidance without requiring complex additional hardware
3Measurement precision
If the electronic device implements real-time signal quality monitoring, then the measurement precision is improved, but the loss of time increases due to iterative adjustment requirements
Solution Approach 1:
The system performs preliminary assessment of signal quality immediately upon acquiring the first measurement signal. By evaluating placement quality early in the measurement process and providing immediate feedback, the system enables users to correct placement issues before committing to a full measurement sequence, reducing the need for repeated measurement attempts
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 allows for precise biometric information measurement by ensuring correct finger positioning on the bio sensor, enhancing the accuracy of heart rate and other physiological parameter readings.
Implementation Method 1
obtaining light reflected by an external object among the emitted light through a light receiver
Implementation Method 2
obtaining a signal generated based on at least a portion of the reflected light and corresponding to the external object
Data Source
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AI summary
An electronic device and method for measuring biometric information are provided. The electronic device includes at least one light emitter; light receiver; and a processor. The processor is configured to emit light outside of the electronic device through the at least one light emitter, obtain, through the light receiver, light reflected by an external object among the emitted light, obtain a signal generated based on at least a portion of the reflected light and corresponding to the external object, output guide information related to a location of the external object when the signal satisfies a first designated condition, and obtain biometric information about the external object when the signal satisfies a second designated condition. When a finger of a user finger of the electronic device is not accurately located at a bio sensor, by guiding an accurate grip location, biometric information about the user can be accurately measured.