Biometric Sensor Light Emission Control for Power Reduction
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Solution Overview
Problem
Wearable biometric devices face high power consumption due to continuous light emission and reception after predetermined measurement periods, which is inefficient for obtaining accurate biological information like pulse wave and blood oxygen saturation.
Innovation Solution
The biometric information acquisition device includes a light emitting unit with red, infrared, and green light elements, and a drive control section that stops light emission after specific measurement periods (T1 and T2) to reduce power consumption, allowing for accurate data collection while minimizing continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light source continues to emit light and the light receiving element continues to receive light after a predetermined time period, then accurate biological information can be obtained through continuous measurement, but power consumption increases
Solution Approach 1:
The patent implements periodic measurement cycles where the light source emits light for a predetermined time period to collect biological information, then stops emission. This periodic on-off operation allows accurate data collection during the measurement window while reducing overall power consumption compared to continuous operation. The control unit manages these measurement cycles to balance accuracy requirements with energy efficiency.
2Adaptability or versatility
If multiple light emitting elements (red, infrared, green) operate simultaneously for continuous measurement, then comprehensive biometric data can be acquired, but device complexity and power consumption increase
Solution Approach 1:
The patent divides the light emission function into multiple independent light emitting elements (red, infrared, green) that can be controlled separately. The control unit manages these segmented elements to emit light in different wavelengths for different measurement purposes. This segmentation allows comprehensive biometric measurement capability while enabling selective operation to reduce overall system complexity and power consumption compared to having all elements operate simultaneously and continuously.
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 reduces power consumption by stopping unnecessary light emission, allowing for accurate measurement of biometric information like blood oxygen saturation and pulse wave while extending device usage without excessive power drain.
Implementation Method 1
a light emitting unit having a first light emitting element that emits red light toward a living body, a second light emitting element that emits infrared light toward the living body, and a third light emitting element that emits green light toward a living body
Implementation Method 2
a light receiving unit having a first light receiving element that receives the red light that passed through the living body, a second light receiving element that receives the infrared light that passed through the living body, and a third light receiving element that receives the green light that passed through the living body
Data Source
AI summary
A biometric information acquisition device includes an acquisition section that obtains first information based on a light amount of the red light received by the first light receiving element, second information based on a light amount of the infrared light received by the second light receiving element, and third information based on a light amount of the green light received by the third light receiving element; and the drive control section that controls a drive and a stop of each of the first light emitting element, the second light emitting element, and the third light emitting element; wherein the biometric information acquisition device measures first biometric information based on the first information and the second information, and second biometric information based on the third information, and the drive control section performs at least one of a first process, which stops the light emission of the first light emitting element and the second light emitting element when a measurement period for measuring the first biometric information reaches the first time period T1, and a second process, which stops the light emission of the third light emitting element when the measurement period for measuring the second biometric information reaches the second time period T2.