Embedded Optical Sensing Circuit Grouping for Stable Pulse Detection
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Solution Overview
Problem
Existing biosensing technologies face challenges in securing a sufficient light exposure period and frequency of digital sensing signals, particularly in embedded optical sensing circuits within display devices, leading to inconsistent and unreliable biosensing results.
Innovation Solution
The display device incorporates a design where optical sensing circuits are grouped into multiple groups, with reset signals applied sequentially over multiple frames, ensuring a consistent and prolonged light exposure period and frequency of digital sensing signals, thereby stabilizing the amplitude and smoothness of the pulse signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical sensing circuits are operated in embedded manner within display device, then integration is improved, but light exposure period and sensing signal frequency become insufficient
Solution Approach 1:
The optical sensing circuits are divided into multiple groups (first group, second group, etc.), with each group having dedicated reset signal lines. This segmentation allows different groups to operate at different times, enabling sequential reset signal application that extends the overall light exposure period while maintaining embedded integration within the display device.
2Adaptability or versatility
If optical sensing circuits are operated in embedded manner within display device, then integration is improved, but sensing signal frequency becomes insufficient
Solution Approach 1:
Reset signals are applied periodically to different groups of optical sensing circuits in a sequential manner across multiple frames. This periodic action with multiple groups enables the sensing signal frequency to be doubled or increased compared to single-group operation, achieving higher productivity while maintaining embedded integration.
3Ease of operation
If reset signals are applied to all optical sensing circuits simultaneously, then operation is simplified, but light exposure period consistency deteriorates
Solution Approach 1:
Optical sensing circuits are segmented into multiple groups with dedicated reset signal lines, and reset signals are applied to each group at different times. This segmentation approach maintains operational simplicity through systematic control while achieving consistent light exposure periods across all circuits by coordinating the sequential reset application with the display frame timing.
4Measurement precision
If light exposure period is extended, then sensing accuracy is improved, but signal frequency decreases
Solution Approach 1:
By dividing optical sensing circuits into multiple groups that operate sequentially, the system achieves both extended light exposure period for each group (improving sensing accuracy) and increased overall signal frequency (multiple groups produce multiple signals per frame). This segmentation enables simultaneous achievement of both objectives.
Solution Approach 2:
While one group of optical sensing circuits is exposed to light, other groups are being reset or reading out signals. This continuous operation across multiple groups ensures that the useful action of light exposure continues without interruption, maintaining high signal frequency while each group receives sufficient exposure time for accurate sensing.
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 secures a consistent and reliable biosensing process by maintaining a constant light exposure period and frequency, enhancing the amplitude and smoothness of the pulse signal, thus improving the accuracy and reliability of biometric indicators.
Implementation Method 1
the light sensing circuit exists separately from a display device... the optical sensing circuit exists inside the display device... generating a sensing current in response to a reflected light generated from a user's body by an optical sensing circuit
Data Source
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AI summary
A display device comprises a display panel including pixel circuits and optical sensing circuits, a gate driver configured to provide gate signals to the pixel circuits and the sensing circuits, a readout circuit receiving sensing currents output from the optical sensing circuits in response to the gate signals and generating a pulse signal based on the sensing currents, and a driving controller configured to control the gate driver and the readout circuit, and to determine a user's a biometric indicator based on the pulse signal. The optical sensing circuits initialized with a reset voltage in response to reset signals are grouped into first to n-th groups. The reset signals are sequentially applied to the first to n-th groups as first to n-th group reset signals during n frames, wherein n is an integer greater than or equal to 2.