Biometric Sensor Light Selection for Wearing State Adaptation
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Solution Overview
Problem
Existing wearable electronic devices face challenges in accurately measuring biological information due to variations in skin permeability and motion sensitivity across different light bands, leading to inaccurate measurements and high power consumption.
Innovation Solution
The electronic device selectively drives light emitting and receiving elements based on the wearing state and motion state, optimizing the use of light bands to enhance measurement accuracy and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting elements of different bands are used to measure biometric information, then measurement coverage is improved, but power consumption increases and measurement accuracy deteriorates due to not considering wearing state
Solution Approach 1:
The patent dynamically selects light emitting elements based on the detected wearing state (tight or loose). When a tight wearing state is detected, green band elements are selected for their motion resistance. When a loose wearing state is detected, IR or red band elements are selected for their skin permeability. This dynamic adaptation resolves the contradiction by activating only the necessary light elements for the current condition, reducing power consumption while maintaining measurement coverage.
Solution Approach 2:
The patent changes the operational parameters (which light emitting elements are active) based on the wearing state parameter. The processor detects wearing state and accordingly changes the configuration of light emitting elements from green band to IR/red band, optimizing both power consumption and measurement coverage for each state.
2Reliability
If green band light emitting elements are used, then motion sensitivity is reduced, but skin permeability is low leading to inaccurate measurement
Solution Approach 1:
The patent changes the wavelength parameter of the light emitting elements based on wearing state. For tight wearing states, green band (shorter wavelength) is selected for motion resistance. For loose wearing states, IR/red band (longer wavelength) is selected for better skin permeability and measurement accuracy. This parameter adaptation resolves the contradiction.
3Measurement precision
If IR or red band light emitting elements are used, then skin permeability is improved, but motion sensitivity increases leading to inaccurate measurement
Solution Approach 1:
The patent adapts the light wavelength parameter based on wearing state detection. IR/red band elements are activated specifically when loose wearing state is detected, where their high skin permeability is beneficial and motion sensitivity is less problematic. This conditional parameter change resolves the contradiction between skin permeability and motion resistance.
4Ease of operation
If light emitting elements are continuously operated to ensure measurement availability, then measurement readiness is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic activation of light emitting elements based on real-time wearing state detection. Instead of continuous operation, the processor detects whether the device is tightly or loosely worn and activates only the appropriate light elements needed for that state. This dynamic approach ensures measurement readiness when needed while significantly reducing power consumption during inactive or suboptimal states.
Solution Approach 2:
The system uses the wearing state detection capability to automatically determine which light emitting elements should be activated, making the system self-regulating. The device monitors its own wearing condition and autonomously adjusts its light emission configuration, eliminating the need for continuous operation while maintaining measurement readiness.
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 more accurate measurement of biological information while minimizing power consumption, improving user comfort and device performance.
Implementation Method 1
the light emitting element may have a first wavelength and the second light emitting element may have a second wavelength different from the first wavelength
Implementation Method 2
the PPG sensor may obtain biometric information using light of various bands such as green, red, and infra-red (IR), and the electronic device may have at least two light emitting elements and/or light receiving elements
Data Source
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Figure 2a~2b
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AI summary
An electronic device for obtaining biological information and a method therefor are provided. The electronic device includes a biometric sensor module including a light emitting module including a first light emitting element having a first attribute and a second light emitting element having a second attribute and light receiving modules disposed adjacent to the light emitting modules, and at least one processor. The at least one processor is configured to determine a distance between the biometric sensor module and an external object based on at least reflected light reflected by collision with the external object among light output from the light emitting module, select at least one of the first light emitting element or the second light emitting element based on the distance, and obtain biometric information about the external object using the selected light emitting element.