Ring-Shaped Electronic Device Optical Coating for Precise Biometric Signals
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Solution Overview
Problem
Existing wearable electronic devices face challenges in accurately obtaining biometric information due to light loss and interference, which affect the precision of biometric data acquisition.
Innovation Solution
A ring-shaped electronic device with an optical coating layer is designed to include a light-emitting unit, light-receiving units, and coating layers that reflect and transmit light back to the light-receiving units, enhancing the accuracy of biometric data acquisition by minimizing light loss and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional optical sensor structure is used without coating layers, then the device structure is simple, but light loss occurs and biometric measurement precision deteriorates
Solution Approach 1:
The patent introduces optical coating layers as intermediary elements between the light source and the finger tissue, and between the tissue and the light receiver. These coating layers act as mediators that optimize light transmission by reflecting scattered light back into the tissue and directing received light toward the sensor, thereby reducing light loss and improving measurement precision without fundamentally changing the basic sensor structure
Solution Approach 2:
The patent applies optical coating layers with specific refractive indices and thicknesses to optimize light transmission characteristics. By changing the optical parameters (refractive index, thickness) of the coating layers, the system improves light coupling efficiency and reduces light loss, directly addressing the contradiction between light loss and measurement precision
2Measurement precision
If optical coating layers are added to improve light transmission, then biometric measurement precision improves, but device complexity increases
Solution Approach 1:
The patent applies optical coating layers selectively at specific locations where light transmission optimization is most needed - namely at the inner surface of the housing that contacts the finger. This localized application improves measurement precision without requiring complex coating structures throughout the entire device, thereby limiting the increase in device complexity
3Quantity of substance
If multiple coating layers are used to reflect different light paths, then light transmission to light-receiving units increases, but manufacturing complexity increases
Solution Approach 1:
The patent divides the optical path into distinct segments and applies separate coating layers to control light in each segment. The first coating layer is applied to the inner surface of the housing to reflect emitted light back into the finger, while the second coating layer is applied to the outer surface to reflect received light toward the light-receiving units. This segmentation allows for optimized light control in each region while maintaining relatively simple manufacturing processes for each individual coating layer
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
The solution increases the amount of light transmitted to the light-receiving units, thereby improving the accuracy of biometric signals such as heart rate, oxidation saturation, and blood alcohol concentration measurements.
Implementation Method 1
a coating layer, disposed between the first region and the second region, configured to reflect a second light, which is distinct from the first light and is remaining portion of the light, to the finger of the user to transmit the second light to the light-receiving unit
Data Source
AI summary
An electronic device is provided. The electronic device includes a ring-shaped housing having an inner surface into which a finger of a user is inserted, a light-emitting unit configured to emit a light to the inner surface of the housing through a first region of the inner surface of the housing within the housing, a light-receiving unit configured to receive first light, which is a portion of the light reflected from an inside of the finger of the user, through a second region of the inner surface of the housing within the housing, and a coating layer, disposed between the first region and the second region, configured to reflect second light, which is distinct from the first light and is remaining portion of the light, to the finger of the user to transmit the second light to the light-receiving unit.