Heart Rate Detection Module with Optical Interference Filtering
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Solution Overview
Problem
Existing electronic devices for heart rate detection suffer from low accuracy due to interference light from tissues and components, which affects the reliability of heart rate data.
Innovation Solution
A heart rate detection module with a light source, optical receiver, and light blocking portion, combined with light filtering portions that guide interference light away from the optical receiver, increasing the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PPG technology is used for heart rate detection, then the detection process is simple and convenient, but the detection accuracy is low due to interference light
Solution Approach 1:
The patent introduces a light blocking portion as an intermediary element positioned between the light source and optical receiver. This component mediates the optical path by selectively blocking interference light from tissues and components while allowing the detection beam to pass through, thereby improving measurement precision without complicating the overall detection process
Solution Approach 2:
The patent extracts and removes the harmful interference light from the optical path using the light blocking portion. By taking out the problematic reflected light from tissues and components before it reaches the optical receiver, the system maintains simplicity while significantly improving heart rate detection accuracy
2Measurement precision
If light blocking portion is added to filter interference light, then heart rate detection accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the light blocking portion with existing components in the detection module, integrating it into the overall structure rather than adding it as a separate external component. This combining approach improves measurement precision while minimizing the increase in device complexity by utilizing shared structural elements
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 module effectively filters interference light, enhancing heart rate detection accuracy by improving the signal-to-noise ratio and reducing errors in heart rate data.
Implementation Method 1
a light filtering portion is disposed on a side that is of the optical film and that is close to the substrate, and the light filtering portion may filter, in a heart rate detection process, interference light emitted to the optical receiver
Implementation Method 2
an electronic device (such as a wearable device or a small heart rate meter) for detecting a heart rate mainly uses a photoplethysmograph (Photoplethysmograph, PPG) technology
Implementation Method 3
The first light guide portion is disposed close to the light source, and is configured to guide, to deviate from the optical receiver, interference light emitted from the light source
Implementation Method 4
a light blocking portion located between the light source and the optical receiver, where the light blocking portion may optically isolate the light source from the optical receiver
Data Source
AI summary
A heart rate detection module and an electronic device are disclosed. The heart rate detection module includes a substrate, and a light source, an optical receiver, a light blocking portion, and an optical film that are disposed on the substrate. The light blocking portion is disposed between the light source and the optical receiver, so that the light source is optically isolated from the optical receiver. The optical film covers the light source, the light blocking portion, and the optical receiver, and a light filtering portion is disposed on a side that is of the optical film and that faces the substrate.