Display Device Edge Signal Correction for Accurate Touch Input
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Solution Overview
Problem
Display devices with touch input sensing layers face challenges in maintaining reliable sensing of external inputs, especially when sensing signals are distorted, leading to inaccuracies in input information detection regardless of the input position.
Innovation Solution
The implementation of a display device with an input sensing layer that resonates with electromagnetic signals to generate sensing signals, and a sensing controller that corrects edge signals using a correction value based on previous sensing signals to differentiate between center and edge signals, ensuring accurate input information calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the input sensing layer resonates with electromagnetic signals to generate sensing signals, then the sensing capability is enhanced, but the sensing signal becomes distorted at edge areas leading to inaccurate input detection
Solution Approach 1:
The sensing controller performs preliminary identification of edge signals before full processing. By detecting whether a sensing signal originates from the edge area (second sensing area) or center area (first sensing area), the controller can apply appropriate correction algorithms in advance, preventing distorted edge signals from compromising input detection accuracy.
Solution Approach 2:
The sensing controller changes processing parameters based on signal location. When an edge signal is identified, the controller applies correction values that adjust the signal parameters, transforming the distorted edge signal into a reliable input signal. This dynamic parameter adjustment resolves the contradiction between enhanced sensing capability and signal reliability.
2Device complexity
If the sensing controller processes all sensing signals uniformly, then the processing logic is simple, but edge signals are incorrectly interpreted leading to wrong input information
Solution Approach 1:
The sensing controller applies different processing quality levels to different signal sources. Center signals from the first sensing area are processed with standard logic, while edge signals from the second sensing area receive enhanced processing including correction value application. This local differentiation maintains reasonable overall complexity while ensuring accurate input information extraction.
Solution Approach 2:
The sensing layer is segmented into distinct functional areas: a first sensing area (center) and a second sensing area (edge). This spatial segmentation allows the controller to apply location-specific processing strategies, improving input information accuracy without requiring complete redesign of the entire processing system.
3Measurement precision
If correction values are applied to edge signals, then the input information accuracy is improved, but the processing time and computational load increase
Solution Approach 1:
The sensing controller performs preliminary identification of edge signals before applying correction values. By quickly determining whether a signal requires correction based on its origin area, the controller minimizes unnecessary processing steps for center signals while applying corrections only where needed, thereby reducing overall processing time while maintaining accuracy.
Solution Approach 2:
The sensing controller applies correction values selectively rather than universally. Only edge signals from the second sensing area receive correction processing, while center signals from the first sensing area are processed normally. This partial action approach improves input information accuracy for edge inputs without incurring the full computational cost for all signals.
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 maintains reliable sensing of external inputs by correcting distorted signals, thereby ensuring accurate input information detection regardless of the input position, enhancing the overall reliability of the display device's input sensing capabilities.
Implementation Method 1
an input sensing layer disposed on the display panel that resonates with an externally applied electromagnetic signal provided from an external input device in a first frame to generate a first sensing signal
Data Source
AI summary
A display device includes a display panel displaying an image, an input sensing layer disposed on the display panel that resonates with an electromagnetic signal provided from an external input device in a first frame to generate a first sensing signal, and a sensing controller including a calculation unit calculating input information of the external input device based on the first sensing signal. The input sensing layer includes a first sensing area, a non-sensing area, and a second sensing area defined between the non-sensing area and the first sensing area, the sensing controller includes a correction unit correcting an edge signal to generate a correction edge signal when the first sensing signal is the edge signal generated in the second sensing area, and the calculation unit calculates edge input information provided to the second sensing area as input information based on the correction edge signal.