Wearable Biometric Sensor Layout for Light Leakage Shielding
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Solution Overview
Problem
Wearable electronic devices face challenges in optimizing component placement due to limited mounting space, particularly for biometric sensors like PPG sensors, which require precise calibration and protection from environmental noise, such as sunlight exposure.
Innovation Solution
A wearable electronic device design featuring a housing with a transparent rear plate, a biometric sensor module between a substrate and the rear plate, and a magnetic substance between a light source and detector to control light exposure, along with a wireless charging module circumferentially surrounding the sensor module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a biometric sensor module is mounted on a wearable electronic device with limited space, then component integration is improved, but light leakage and environmental noise interference increase
Solution Approach 1:
The magnetic substance is integrated within the housing structure itself, nesting the shielding function within the existing device architecture. This allows the sensor module to be mounted in limited space while the magnetic substance provides light leakage prevention and environmental noise shielding without requiring additional external components.
Solution Approach 2:
The magnetic substance acts as an intermediary element between the light source and the sensor module, as well as between the sensor and the external environment. It selectively blocks harmful light leakage and environmental noise while allowing the necessary optical signals to reach the sensor for biometric detection.
2Reliability
If the rear plate is made substantially transparent to allow sensor operation, then sensor functionality is improved, but light leakage inside the device increases
Solution Approach 1:
The magnetic substance is positioned specifically at strategic locations within the housing where light leakage paths occur. It provides localized light blocking properties only where needed, while the rear plate remains substantially transparent in the areas required for sensor operation and light transmission.
Solution Approach 2:
The magnetic substance, which may otherwise be considered an obstruction, is strategically placed to convert potential light leakage paths into beneficial light-blocking barriers. It prevents internal light leakage that would interfere with sensor measurements while maintaining the overall transparency needed for sensor functionality.
3Reliability
If components are positioned to optimize their individual functions, then component performance is improved, but design flexibility of other components is reduced
Solution Approach 1:
The magnetic substance serves multiple functions simultaneously: it provides light leakage prevention, environmental noise shielding, and structural integration within the housing. This multi-functionality allows other components to be positioned optimally for their individual functions without requiring additional dedicated shielding structures, thereby maintaining design flexibility.
Solution Approach 2:
The shielding and light-blocking functions are merged into the housing structure through the integrated magnetic substance, rather than being separate components. This consolidation allows multiple components to be positioned optimally without creating design conflicts, as the magnetic substance provides comprehensive protection without occupying additional design space.
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 design effectively prevents light leakage, maintains sensor reliability, and enhances component mounting flexibility and design freedom by using a magnetic substance as a shield structure during wireless charging.
Implementation Method 1
at least one magnetic substance disposed between the light source and the light detector to limit an amount of light reaching the biometric sensor module other than the reflected emitted light
Implementation Method 2
at least one light source configured to emit light to an exterior of the wearable electronic device
Implementation Method 3
at least one light detector configured to receive reflected light corresponding to the emitted light reflected from the exterior
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A wearable electronic device is disclosed, including: a housing having a front plate disposed facing in a first direction, a rear plate disposed facing in a second direction opposite to the first direction, at least a part of the rear plate substantially transparent, and a side member defining a space between the front plate and the rear plate, a substrate disposed within the space, a biometric sensor module disposed between the substrate and the rear plate including at least one light source configured to emit light to an exterior of the wearable electronic device and at least one light detector configured to receive reflected light corresponding to the emitted light reflected from the exterior, and at least one magnetic substance disposed between the light source and the light detector to limit an amount of light reaching the biometric sensor module other than the reflected emitted light.