Display Device Light-Sensing Pixels Blood Pressure Detection
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Solution Overview
Problem
Current display devices lack the capability to accurately detect photoplethysmography signals and measure blood pressure at high speeds, leading to potential errors in pulse wave signal detection due to frequency mismatches between image display and light-sensing signals.
Innovation Solution
A display device incorporating light-sensing pixels alternately arranged with display pixels, connected to light-sensing scan lines and a blood-pressure detecting circuit, which uses display scan drivers to supply synchronized scan signals, enabling accurate detection of blood pressure through reflected light from a user's body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light-sensing pixels are integrated into the display panel to enable blood pressure detection, then the functionality and versatility of the display device are improved, but the device complexity and signal detection accuracy deteriorate due to frequency mismatches between display and sensing operations
Solution Approach 1:
The patent implements periodic action by operating light-sensing pixels at the same frequency as the display refresh rate (e.g., 60Hz). The display scan driver sequentially supplies scan signals to both display pixels and light-sensing pixels in synchronized periods, ensuring that photoplethysmography signals are captured at regular intervals matching the display cycling. This periodic synchronization eliminates frequency mismatch errors and enables accurate pulse wave detection.
Solution Approach 2:
The patent applies universality by designing the display panel to serve multiple functions: displaying visual information through display pixels and detecting blood pressure through integrated light-sensing pixels. The display scan driver is configured to sequentially supply scan signals to both types of pixels, allowing a single device to perform both display and health monitoring functions without requiring separate dedicated hardware systems.
2Measurement precision
If light-sensing pixels are operated at display driving frequency, then the measurement precision of pulse wave signals is improved, but the device complexity increases due to synchronized timing control requirements
Solution Approach 1:
The patent merges the display scan driver functionality to simultaneously control both display pixels and light-sensing pixels. The same scan driver that generates timing signals for display refresh also generates synchronized timing signals for light-sensing operations. This consolidation eliminates the need for separate dedicated sensing hardware and its associated complex timing control, reducing overall device complexity while maintaining synchronization.
3Productivity
If display scan signals are supplied to light-sensing scan lines, then the productivity and detection speed are improved, but the reliability of signal separation deteriorates due to potential interference between display and sensing signals
Solution Approach 1:
The patent applies segmentation by spatially separating display pixels and light-sensing pixels within the display panel structure. Light-sensing pixels are positioned in specific regions (e.g., along the bottom edge or in dedicated sensing zones) distinct from the main display pixel matrix. This spatial segmentation allows independent signal readout paths, enabling high-speed detection through shared scan drivers while maintaining reliable signal separation through physical isolation of sensing 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
Enables reliable detection of blood pressure with reduced waveform distortion by matching the light-sensing signal frequency to the image display panel's driving frequency, enhancing the accuracy and reliability of blood-pressure measurement functions.
Implementation Method 1
Each of the light-sensing pixels includes a photo-detecting element and a sensing driving unit connected to the photo-detecting element
Data Source
AI summary
A display device includes display pixels arranged in a display area of a display panel, light-sensing pixels arranged alternately with the display pixels in the display area, light-sensing scan lines, each divided into at least two horizontal lines disposed adjacent to each other and connected to light-sensing pixels disposed proximate to the at least two horizontal lines, a display scan driver configured to sequentially supply display scan signals to display pixels connected to each horizontal line through display scan lines corresponding to each horizontal line, a blood-pressure detecting circuit configured to measure a user's blood pressure using light-sensing signals input through the light-sensing pixels, and a display driving circuit configured to control a timing at which the display scan signals are supplied to the display scan lines and a timing at which sensing scan signals are supplied to the light-sensing scan lines.