Wearable Sensor Array for Biometric Signal Adaptation
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Solution Overview
Problem
Wearable devices face challenges in accurately measuring biometric signals due to variations in user body size and hairstyle, which can obstruct light emission and reception from photo-sensors, leading to inconsistent measurement accuracy.
Innovation Solution
A wearable device with multiple photo-sensors arranged in different directions on its housing, allowing the processor to identify the most suitable sensor for each user based on signal quality and apply different weight values to the signals from these sensors to enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single photo-sensor is used in wearable devices, then the device structure is simple, but measurement accuracy varies due to user body size and hairstyle variations
Solution Approach 1:
The patent divides the single photo-sensor into multiple photo-sensors (first photo-sensor and second photo-sensor) arranged in different directions. This segmentation allows the system to capture biometric signals from multiple angles, improving measurement accuracy for users with different body sizes and hairstyles by selecting or combining signals from appropriate sensors.
2Adaptability or versatility
If multiple photo-sensors are arranged in different directions, then adaptability to different users is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal sensor system where multiple photo-sensors serve different functions: the first photo-sensor measures biometric signals in a first direction while the second photo-sensor measures in a second direction. This multi-functional arrangement allows a single device to adapt to various user types without requiring user-specific customization, resolving the complexity issue through standardized multi-directional sensing.
3Measurement precision
If photo-sensors are positioned to contact the user's body, then signal quality improves, but hair obstruction becomes more problematic
Solution Approach 1:
The patent transitions from single-direction light measurement to multi-dimensional light measurement by arranging photo-sensors in different directions. The first photo-sensor measures light in a first direction while the second photo-sensor measures light in a second direction, allowing the system to bypass hair obstructions by selecting measurement paths that are not blocked, thus maintaining signal quality without requiring direct body contact.
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 enables more accurate biometric information collection by adapting to individual user variations, improving signal quality and consistency across different body types and hairstyles.
Implementation Method 1
a photo-sensor (for example, PPG sensor) in order to acquire a photoplethysmogram (PPG) signal. After light that has been output through a light emitter of an photo-sensor is projected onto the user's tissues and blood vessels, light which is reflected thereby or which has passed therethrough may be measured by a photo-detector of the photo-sensor
Data Source
AI summary
A wearable device may include a housing, a plurality of photo-sensors that are arranged on the housing or arranged to be exposed outside through the housing, and configure at least one array, and at least one processor, wherein the at least one processor is configured to obtain a plurality of biometric signals, based on outputting light through the plurality of photo-sensors, identify qualities of the obtained a plurality of biometric signals, determine, based on the identified qualities, at least one photo-sensor among the plurality of photo-sensors as a sensor for identification of biometric information, and identify biometric information, based on a biometric signal obtained from the at least one photo-sensor, and output the identified biometric information