Display Device Deviation Compensating Circuit for Touch Signal Phase Correction
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Solution Overview
Problem
In large display devices, the phases and amplitudes of AC signals used in load free driving methods for touch sensors can become distorted due to increased sizes of connectors, cables, and PCB lines, leading to reduced load free effect and deteriorated touch detection accuracy.
Innovation Solution
A display device and method that includes a deviation compensating circuit to receive feedback signals from touch driving and AC signals, detect phase and amplitude deviations, and generate compensation signals to correct these deviations, ensuring the touch driving signal and AC signals maintain the same phase and amplitude during touch sensor driving periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the display device increases, then the display area is enlarged, but the phases and amplitudes of AC signals become distorted due to increased connector, cable, and PCB line sizes
Solution Approach 1:
The patent applies feedback by detecting the actual phase and amplitude of AC signals after they pass through connectors, cables, and PCB lines, then using this detected information to generate compensation signals that correct the distortions. This closed-loop feedback mechanism ensures that signal accuracy is maintained despite increases in display device size.
Solution Approach 2:
The patent changes the parameters of compensation signals (phase and amplitude) based on the detected distortions. By dynamically adjusting these parameters to match and counteract the signal degradations, the system maintains accurate touch sensing performance across different display sizes.
2Reliability
If load free driving method is used to reduce parasitic capacitance influence, then touch sensing performance is improved, but phase and amplitude distortions occur in large display devices
Solution Approach 1:
The system uses feedback to detect the actual state of touch driving signals and AC signals, then generates compensation signals based on the detected phase and amplitude differences. This feedback mechanism maintains the load free effect while correcting signal distortions in large displays.
Solution Approach 2:
The patent applies preliminary anti-action by generating compensation signals in advance that are designed to counteract the expected phase and amplitude distortions. These compensation signals are applied before the actual touch sensing operation to pre-correct the signal paths.
3Length of stationary object
If AC signals are supplied through longer cables and connectors in large displays, then display size is increased, but signal distortion increases
Solution Approach 1:
The patent implements feedback by detecting the actual signal characteristics after transmission through long cables and connectors, then using this information to generate compensation signals that restore the original phase and amplitude, thereby maintaining signal integrity despite increased transmission distances.
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 compensation method enhances the load free effect, improving touch sensitivity and accuracy by maintaining synchronized phases and amplitudes of touch driving and AC signals, even in larger display devices.
Implementation Method 1
detect a phase deviation and an amplitude deviation between the feedback touch driving signal and the first and the second feedback AC signals
Implementation Method 2
detect a phase deviation and an amplitude deviation between the feedback touch driving signal and the first and the second feedback AC signals
Implementation Method 3
maintain the same phase and amplitude during touch sensor driving periods
Implementation Method 4
maintain the same phase and amplitude during touch sensor driving periods
Data Source
AI summary
A display device includes a deviation compensating circuit to receive a feedback touch driving signal from a sensor line connected to one of a plurality of touch sensor, receive a first feedback AC (alternating current) signal from a data line connected to one of a plurality of pixels, receive a second feedback AC signal from a gate line connected to the pixels, detect a phase deviation and an amplitude deviation between the feedback touch driving signal and the first and the second feedback AC signals, and generate a compensation touch driving signal, a first compensation AC signal, and a second compensation AC signal for compensating for the phase deviation and the amplitude deviation.