Integrated Optical Sensor Display Timing for Pulse Wave Detection
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Solution Overview
Problem
Portable blood pressure measuring devices require separate light sources and sensors, necessitating a connection to a smartphone or tablet, which is inconvenient.
Innovation Solution
A display device with integrated optical sensors and sensing control circuitry that detects light sensing signals at the same frequency as the image display panel, using a display panel with scan write lines, sensing lines, and optical sensors, along with a scan driver, read-out circuit, and timing controller to accurately detect pulse wave signals without errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If portable blood pressure measuring devices use separate light sources, sensors, and displays, then measurement functionality is achieved, but device complexity and convenience deteriorate due to requiring accompanying smartphones or tablets
Solution Approach 1:
The patent integrates the light source, optical sensor, and display into a single display device unit. The optical sensor is embedded within the display panel structure, allowing the display device to function both as a visual output device and as a blood pressure measurement device without requiring separate components or external smartphones/tablets.
Solution Approach 2:
The display device is designed to perform multiple functions: it serves as both a conventional display device for visual output and as a blood pressure measurement device. The optical sensor array within the display panel can detect light for both display purposes and physiological measurement purposes, enabling one device to fulfill multiple roles.
2Measurement precision
If light sensing signals are detected at low speed, then device complexity is reduced, but detection waveform distortion occurs and measurement precision deteriorates
Solution Approach 1:
The read-out circuit is designed with separate processing paths for different signal types. It can selectively read out light sensing signals from specific optical sensors at high speed when blood pressure measurement is required, while maintaining lower overall operating complexity by only activating high-speed processing when needed.
Solution Approach 2:
The read-out circuit operates in periodic cycles, switching between high-speed sampling mode for pulse wave detection and normal operation mode. During blood pressure measurement, it performs rapid sequential readings of light sensing signals synchronized with the pulse wave frequency, then returns to standard display operation.
3Measurement precision
If light sensing signals are detected at high speed matching image display frequency, then detection waveform distortion is prevented and measurement precision is improved, but device complexity increases due to sophisticated read-out circuit requirements
Solution Approach 1:
The read-out circuit incorporates feedback mechanisms that monitor the detected light sensing signals and adjust sampling timing and frequency accordingly. This feedback system ensures that high-speed sampling is synchronized with both the image display refresh rate and the pulse wave frequency, preventing waveform distortion while maintaining measurement accuracy.
4Reliability
If sampling frequency does not match image display frequency, then device operation is simpler, but detection waveform distortion occurs and measurement reliability deteriorates
Solution Approach 1:
The timing controller is configured to pre-synchronize the sampling timing of light sensing signals with the image display refresh cycle before actual measurement begins. This preliminary synchronization ensures that high-speed sampling occurs at optimal moments in the display refresh sequence, preventing waveform distortion without requiring complex real-time adjustments during measurement.
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
The solution enables high-speed and accurate detection of light sensing signals, preventing waveform distortions and enhancing the reliability of blood pressure detection, thereby increasing the reliability of blood pressure measurements.
Implementation Method 1
Each of the optical sensors includes: a photoelectric conversion element including an anode electrode and a cathode electrode connected to a voltage line
Data Source
AI summary
A display device including: a display panel including scan write lines, sensing lines, pixels respectively connected to the scan write lines, and optical sensors respectively connected to the scan write lines and the sensing lines; a scan driver configured to sequentially output scan write signals to the scan write lines in response to a scan control signal; a read-out circuit configured to receive light sensing signals of the optical sensors from the sensing lines in response to a first sampling signal; and a timing controller configured to control the scan driver and the read-out circuit, wherein an interval between pulses of the first sampling signal has a first horizontal period, and an interval between pulses of each of the scan write signals has a second horizontal period.