Biometric Sensor Layout for Incomplete Body Contact Detection
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Solution Overview
Problem
Wearable devices face challenges in accurately obtaining biometric information due to inconsistent contact with the user's body, leading to reduced credibility of measurements, particularly when only partial body parts cover the sensor.
Innovation Solution
An electronic device equipped with a sensor comprising LEDs and PDs arranged symmetrically to emit and receive lights of different wavelengths, allowing for precise identification of body coverage and measurement of biometric information, including antioxidative component concentration, through feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is designed to obtain biometric information through body contact, then biometric measurement capability is improved, but measurement precision deteriorates when body contact is incomplete
Solution Approach 1:
The sensor is divided into multiple detection regions (first detection region and second detection region) with different LED and PD arrangements. This segmentation allows independent verification of body contact in different areas, enabling the system to detect incomplete contact and prompt users to adjust, thereby maintaining measurement precision while preserving biometric measurement capability
Solution Approach 2:
The system performs preliminary detection of body contact completeness before actual biometric measurement. By using the first and second detection regions to verify proper sensor coverage in advance, the system can identify and correct incomplete contact issues before they affect measurement accuracy, ensuring both measurement capability and precision
2Measurement precision
If multiple LEDs and PDs are arranged symmetrically to detect body coverage, then measurement precision is improved, but device complexity increases
Solution Approach 1:
While maintaining overall symmetric layout for balance, the patent uses asymmetric functional zoning within the sensor - the first and second detection regions have different LED-PD configurations optimized for their specific detection purposes. This allows precise body coverage detection through regional specialization without requiring complete symmetry, reducing complexity while maintaining precision
Solution Approach 2:
The sensor regions serve multiple functions: the first detection region verifies initial body contact, the second detection region confirms proper coverage area, and both contribute to the overall biometric measurement. This multi-functionality reduces the need for separate dedicated components, achieving high detection precision with controlled complexity
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
Ensures accurate biometric data acquisition by confirming complete sensor coverage and providing feedback, enhancing the credibility of measurements by ensuring proper contact with the user's body.
Implementation Method 1
a first photo diode (PD) and a second PD that are arranged between the outside of the first area and the inside of the second area, configured to receive lights emitted from the plurality of first LEDs and the at least one second LED
Data Source
AI summary
A processor of an electronic device according to the disclosure is configured to, based on first sensing data obtained by at least one of a first photo diode (PD) or a second PD receiving a light emitted from at least one second light emitting diode (LED), identify whether a user's body covers a sensor, and based on identifying that the body covers the sensor, control each of a plurality of first LEDs to emit lights of wavelengths different from one another, and based on second sensing data obtained by at least one of the first PD or the second PD receiving the lights of different wavelengths emitted from the plurality of first LEDs, measure biometric information of the user.