Optical Touch Device Heart Rate Measurement Accuracy
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Solution Overview
Problem
Current portable electronic devices, such as mobile phones, have limited accuracy in measuring heart rate due to hardware constraints, requiring separate and expensive devices like pulse oximeters for higher precision.
Innovation Solution
An optical touch device with an image sensor and specific frequency extractor that generates heart rate information by separating displacement and brightness variations in image signals, allowing for accurate heart rate measurement while also providing touch control functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pulse oximeter is used to measure heart rate, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines heart rate measurement functionality with the existing optical touch device structure. The image sensor used for touch detection is also utilized to capture light absorption variations for heart rate measurement, merging two functions into a single integrated system rather than requiring separate pulse oximeter hardware
Solution Approach 2:
The optical touch device's image sensor is designed to perform multiple functions: detecting touch input and simultaneously measuring heart rate by analyzing light absorption changes through the finger. This multi-functional approach eliminates the need for dedicated pulse oximeter components
2Measurement precision
If a pulse oximeter is used to measure heart rate, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent integrates heart rate measurement capability into the portable optical touch device that users already carry, eliminating the need to transport separate pulse oximeter equipment. The same image sensor that detects touch on the device screen also measures heart rate when the user places their finger on the touch surface
3Measurement precision
If displacement variation is not separated from brightness variation, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent segments the image signal into two distinct components: displacement variation (related to finger movement on the touch screen) and brightness variation (related to light absorption changes from blood flow). By separating these variations, the system can isolate the heart rate signal from movement noise, improving measurement accuracy through signal decomposition
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
Enables high-accuracy heart rate measurement directly on portable devices, enhancing user convenience and eliminating the need for separate, costly equipment.
Implementation Method 1
an image sensor, for reflecting reflected light of specific light while sensing an pointer touching the optical touch device
Data Source
AI summary
Method for increasing accuracy of heart rate measuring includes sensing a finger of a user for generating sensed images of the finger, obtaining displacement information of the finger according to the sensed images, then using the motion information to compensate the sensed images of the finger, and finally using brightness variation of the compensated sensed images of the finger to measure heart rate of the user.