Blood Pressure Measurement Using Display Pixel Light Source
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Solution Overview
Problem
Conventional electronic pulse measurement devices are cumbersome due to the need for separate light sources, sensors, and displays, making them less convenient for portable blood pressure measurement.
Innovation Solution
A blood pressure measurement system that integrates a display device with a pressure measurement device, using a pixel to emit light, a photo-sensor to sense light reflected from the user's finger, and a main processor to analyze both pressure and pulse wave signals to calculate accurate blood pressure values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electronic pulse measurement device includes independent light source, sensor, and display, then measurement functionality is achieved, but device portability and convenience deteriorate
Solution Approach 1:
The patent combines the display device and pressure measurement device into a single integrated system. The display device's screen serves as both a display medium and a light source for photoplethysmography (PPG) sensing, while the pressure measurement device provides cuff-based blood pressure measurement. This merging eliminates the need for separate independent components, thereby improving portability while maintaining measurement functionality.
Solution Approach 2:
The display device performs multiple functions: it displays visual information, emits light for PPG-based pulse measurement, and the pressure measurement device simultaneously provides blood pressure measurement. This multi-functionality allows a single device to replace multiple separate devices, enhancing portability and convenience without sacrificing measurement capabilities.
2Reliability
If pressure measurement value is applied to calculate blood pressure, then blood pressure measurement is achieved, but measurement accuracy deteriorates due to constant pressure sections
Solution Approach 1:
The patent extracts and excludes the constant pressure section from blood pressure calculation. The processor identifies sections where the pressure measurement value remains constant over time and excludes these from the calculation, using only sections where the pressure measurement value changes. This extraction of problematic data portions improves measurement precision while maintaining the overall blood pressure measurement functionality.
Solution Approach 2:
The system continuously monitors the pressure measurement value over time and uses this feedback to dynamically identify measurement sections. By analyzing the temporal changes in pressure values, the processor can distinguish between constant and changing pressure sections, enabling adaptive selection of appropriate data for blood pressure calculation and thereby improving accuracy.
3Ease of operation
If pressure measurement device applies pressure to user's body, then blood pressure measurement is enabled, but measurement section identification becomes difficult due to constant pressure periods
Solution Approach 1:
The processor performs preliminary analysis of the pressure measurement signal to identify constant pressure sections before conducting blood pressure calculation. By pre-identifying and marking these sections, the system prepares the data in advance, making the subsequent blood pressure measurement process simpler and more reliable, thereby reducing the difficulty of measurement section identification.
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 system enhances the accuracy of blood pressure calculation by synchronizing pressure application and light sensing, allowing for more precise measurement of systolic, diastolic, and mean blood pressures using a single, portable device.
Implementation Method 1
a photo-sensor sensing external light and outputting a first pulse wave signal based on the external light
Implementation Method 2
a photo-sensor sensing external light and outputting a first pulse wave signal based on the external light
Implementation Method 3
a pressure sensor sensing an external pressure
Data Source
AI summary
A blood pressure measurement system includes a display device; and a pressure measurement device applying a pressure to a user's body according to a pressure control signal and sensing a pressure measurement value. The display device includes a pixel emitting light; a photo-sensor sensing external light and outputting a first pulse wave signal based on the external light; and a main processor, wherein the main processor receives the first pulse wave signal, outputs the pressure control signal to the pressure measurement device, receives a first pressure signal including the pressure measurement value from the pressure measurement device, and calculates a blood pressure based on the first pulse wave signal.