Display Device Blood Pressure Measurement Using Multi-Wavelength Pulse Sensing
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Solution Overview
Problem
Conventional portable electronic devices for blood pressure measurement require separate components and a prolonged user action for accurate measurement, making them inconvenient and time-consuming.
Innovation Solution
A display device equipped with first and second pixels emitting different wavelengths of light, a photosensor, and a pulse wave sensing circuit, along with a pressure sensor, which alternately senses light and calculates blood pressure information using correction signals generated through interpolation and noise removal techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional oscillometric pulse measurement device is used, then blood pressure measurement is possible, but the device requires separate components and prolonged user action, making it inconvenient and time-consuming
Solution Approach 1:
The patent combines multiple functions (display, camera, fingerprint sensor, and blood pressure measurement) into a single portable display device. The blood pressure measurement system is integrated into the display device, eliminating the need for separate measurement devices and reducing the number of components the user must carry and operate.
Solution Approach 2:
The display device is designed to perform multiple functions including displaying information, capturing images via camera, fingerprint authentication, and blood pressure measurement. This multi-functional approach allows the device to serve as both a conventional display device and a healthcare monitoring tool, improving ease of operation by consolidating functions.
2Ease of operation
If the blood pressure measurement system is built in the display device, then measurement convenience is improved, but the user must maintain the action for a relatively long time to accurately measure blood pressure
Solution Approach 1:
The system uses periodic light emission from pixels at different wavelengths (e.g., red and green) to illuminate the blood vessel, with the photosensor periodically detecting the reflected light. This periodic action allows for continuous monitoring and processing of pulse wave signals over time, enabling accurate blood pressure measurement while managing the duration of user action through automated periodic sensing.
Solution Approach 2:
The blood pressure measurement system continuously monitors pulse wave signals by maintaining continuous light emission and detection. The system processes pulse wave signals in real-time, continuously analyzing the relationship between pulse wave characteristics and blood pressure, which allows for accurate measurement without requiring the user to maintain a static position for extended periods.
3Measurement precision
If single wavelength light is used for pulse measurement, then the device structure is simple, but measurement accuracy is insufficient
Solution Approach 1:
The system uses pixels at different wavelengths (e.g., red and green) to illuminate different depths of tissue. Shorter wavelengths penetrate shallower while longer wavelengths penetrate deeper, allowing the system to capture pulse wave signals from different tissue layers. This local quality differentiation improves measurement accuracy by providing comprehensive tissue characterization.
Solution Approach 2:
The system employs a composite approach by using multiple wavelengths of light simultaneously or alternately to probe different tissue properties. This multi-wavelength strategy creates a composite measurement that captures both superficial and deep tissue characteristics, improving blood pressure measurement accuracy while managing device complexity through integrated pixel and photosensor design.
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 measurement time and improves accuracy by simultaneously sensing light and pressure, allowing for efficient and precise blood pressure calculation.
Implementation Method 1
a photosensor which senses the first light and the second light which are alternately provided a plurality of times
Implementation Method 2
a first pixel which emits first light; a second pixel which emits second light having a different wavelength from the first light
Data Source
AI summary
A display device includes a first pixel which emits first light; a second pixel which emits second light having a different wavelength from the first light; a photosensor which senses the first light and the second light which are alternately provided a plurality of times; and a pulse wave sensing circuit which receives information about the first light and information about the second light sensed by the photosensor and generates a first pulse wave signal based on the information about the first light and a second pulse wave signal based on the information about the second light; and a main processor which receives the first pulse wave signal and the second pulse wave signal and calculates blood pressure information.