Display Device Integrating Force and Light Sensors for Blood Pressure Measurement
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Solution Overview
Problem
Conventional portable blood pressure measuring devices require separate light sources and sensors, making them inconvenient for use alongside portable smartphones or tablets.
Innovation Solution
A display device integrated with a force sensor and a light receiving sensor, which generates a pulse wave signal based on reflected light, allowing for the measurement of blood pressure without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional portable blood pressure measuring device is used, then blood pressure measurement function is achieved, but the device requires separate light source, sensor, and display components causing inconvenience
Solution Approach 1:
The patent combines the light source, light receiving sensor, force sensor, and display into a single integrated display device. The light source is positioned behind the display panel, the light receiving sensor is embedded in the display panel between pixels or in through-holes, and the force sensor is disposed on the display panel surface, creating a unified portable blood pressure measuring device that eliminates the need for separate components.
Solution Approach 2:
The display panel serves multiple functions: it displays information, acts as a light source (through integrated LEDs or other light emitting elements), houses the light receiving sensor for optical detection, and incorporates the force sensor for contact detection. This multi-functional integration allows a single device to perform blood pressure measurement while maintaining display capabilities.
2Weight of moving object
If separate light source and sensor components are used for blood pressure measurement, then measurement function is achieved, but portability and integration with smartphone or tablet is reduced
Solution Approach 1:
The light source, light receiving sensor, and force sensor are merged into the display panel structure. The light source is positioned behind the display panel, light passes through the display panel to the user's finger, and the light receiving sensor detects reflected light through through-holes or between pixels. This integration maintains measurement reliability while significantly improving portability.
Solution Approach 2:
The display panel itself acts as an intermediary medium that facilitates light transmission and sensor integration. The panel's structure allows light to pass through to the finger while incorporating sensors that detect optical and mechanical changes, enabling accurate measurement within a portable form factor.
3Device complexity
If light receiving sensor is disposed between pixels or in through-hole, then integration is improved, but sensor placement complexity increases
Solution Approach 1:
The light receiving sensor is strategically positioned in specific locations within the display panel structure - either in through-holes or between pixel groups. This localized placement optimizes light path efficiency while maintaining integration. The force sensor is positioned on the display panel surface at the measurement location, creating localized sensing zones that match the optical measurement path.
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 convenient and accurate measurement of blood pressure using a single device, reducing the need for separate components and improving portability.
Implementation Method 1
the light receiving sensor configured to sense an amount of light reflected toward the display panel
Implementation Method 2
the light receiving sensor configured to sense an amount of light reflected toward the display panel and generate an optical signal corresponding to the amount of the light
Implementation Method 3
a force sensor disposed on a surface of the display panel, the force sensor configured to sense an external force
Implementation Method 4
a main processor configured to generate a pulse wave signal according to the optical signal received from the light receiving sensor and analyze a magnitude, a period, and a wave change of the pulse wave signal
Data Source
AI summary
A display device capable of measuring a user's blood pressure by analyzing a photoplethysmographic signal is disclosed. The display device includes a display panel including a plurality of pixels; a force sensor disposed on a surface of the display panel, the force sensor configured to sense an external force; a light receiving sensor disposed between a group of neighboring pixels of the plurality of pixels, or disposed in a through hole in a front portion of the display panel, the light receiving sensor configured to sense an amount of light reflected toward the display panel and generate an optical signal corresponding to the amount of light; and a main processor configured to generate a pulse wave signal according to the optical signal received from the light receiving sensor and analyze a magnitude, a period, and a wave change of the pulse wave signal.