Display Device Biometric Sensing Signal Correction
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Solution Overview
Problem
Display devices with input sensing layers struggle to accurately sense biometric information due to environmental influences, such as temperature changes, which distort sensing signals and affect the reliability of biometric measurements.
Innovation Solution
A display device with an input sensing layer and a sensing controller that operates in multiple modes, using a correction value based on environmental parameters to convert sensing signals and separate areas for input detection, allowing for accurate biometric information measurement by compensating for signal distortions caused by environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an input sensing layer is used to sense biometric information, then touch-based input capability is improved, but measurement precision deteriorates due to environmental influences
Solution Approach 1:
The sensing area is divided into a first area where only the first external input (touch) is sensed and a second area where the second external input (biometric) is applied. This segmentation allows separate sensing zones to avoid signal interference between touch detection and biometric measurement, improving measurement precision while maintaining touch capability
Solution Approach 2:
The sensing controller adjusts sensing parameters based on environmental conditions (temperature, humidity) by applying correction values to the sensing signals. This dynamic parameter adjustment compensates for environmental influences on the sensing layer, maintaining measurement precision across varying conditions
2Device complexity
If sensing is performed without correction for environmental factors, then device complexity is reduced, but reliability deteriorates due to signal distortion
Solution Approach 1:
The sensing controller pre-calculates correction values based on environmental parameters (temperature, humidity) before biometric sensing occurs. This preliminary correction preparation allows the system to compensate for environmental effects without adding complex real-time processing during measurement, maintaining reliability while controlling complexity
Solution Approach 2:
Correction values act as an intermediary between environmental parameters and sensing signals. The sensing controller uses these correction values to adjust raw sensing data, effectively mediating the influence of environmental factors on measurement reliability without requiring direct complex environmental compensation
3Measurement precision
If the sensing area is divided into multiple areas, then measurement precision is improved by separating input detection zones, but device complexity increases
Solution Approach 1:
The sensing area is segmented into distinct first and second areas with different sensing purposes. The controller processes signals from each area separately, applying appropriate correction values for each zone. This segmentation improves measurement precision by preventing signal cross-contamination while maintaining manageable controller complexity through standardized processing routines
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 reliable measurement of biometric information without being influenced by environmental conditions, ensuring accurate and consistent results by correcting sensing signals based on temperature and other environmental parameters.
Implementation Method 1
The plurality of sensing electrodes may include a first electrode and a second electrode electrically insulated from the first electrode, and the sensing signal includes a value of capacitance variation between the first electrode and the second electrode
Data Source
AI summary
A display device includes a display panel displaying an image, an input sensing layer disposed on the display panel and including a plurality of sensing electrodes, and a sensing controller electrically connected to the input sensing layer and operating in at least one of a first mode and a second mode. A position of a first external input applied to the input sensing layer is sensed in the first mode, biometric information of a second external input applied to the input sensing layer is measured in the second mode. The sensing controller converts a sensing signal sensed from the input sensing layer based on a correction value determined based on parameters of surrounding environment to generate a correction sensing signal, and the sensing controller measures the biometric information from the correction sensing signal in the second mode.