Orthogonal Touch Driving Signals for Ghost Touch Resolution
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Solution Overview
Problem
Touch display devices face challenges in distinguishing between actual and ghost touches, especially when the display panel is divided into sub-areas, leading to duplicately generated touch signals and difficulty in identifying unintended touches.
Innovation Solution
The implementation of a touch display device and method that applies orthogonal touch driving signals to adjacent electrodes, utilizing a touch circuit to derive self-capacitances and mutual capacitances from sensing signals, allowing for the differentiation between actual and ghost touches by determining touch relevance and presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the display panel is divided into sub-areas and one touch line is connected to multiple touch electrodes, then the number of touch lines and touch sensing units is reduced, but ghost touches cannot be distinguished from actual touches
Solution Approach 1:
The touch electrodes connected to the same touch line are divided into different groups (first group and second group). By segmenting the touch electrodes into distinct groups with different driving signal assignments, the system can differentiate between actual touches and ghost touches while maintaining the reduced touch line configuration.
Solution Approach 2:
Different touch electrodes connected to the same touch line are assigned different touch driving signals (first touch driving signal vs. second touch driving signal). This local differentiation in signal assignment allows the touch sensing unit to distinguish which specific electrode is being touched, enabling ghost touch detection while using fewer touch lines.
2Reliability
If the number of touch electrodes is increased to increase touch sensitivity, then touch sensitivity improves, but the number of touch lines and touch sensing units must be increased
Solution Approach 1:
Each touch electrode serves multiple functions: it can be driven by different touch driving signals (first or second signal) depending on its group assignment, and it can be sensed by the same touch sensing unit through shared touch lines. This multi-functionality allows increased touch electrode count without proportionally increasing touch lines or sensing units.
Solution Approach 2:
The system applies different touch driving signals to different groups of touch electrodes connected to the same touch line. By using partial signal differentiation (first signal for some electrodes, second signal for others), the system achieves sufficient touch discrimination capability without needing separate dedicated lines for each electrode.
3Reliability
If orthogonal touch driving signals are applied to adjacent touch electrodes, then actual touches can be distinguished from ghost touches, but signal processing complexity increases
Solution Approach 1:
The touch circuit alternates between applying first touch driving signals and second touch driving signals to different groups of touch electrodes in a periodic manner. This periodic signal application creates distinct sensing patterns that simplify the differentiation process compared to using complex orthogonal signals continuously.
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 enables accurate touch sensing and differentiation between actual and ghost touches, enhancing the reliability of touch input in display devices by effectively distinguishing between intended and unintended touch inputs.
Implementation Method 1
a touch circuit providing touch driving signals orthogonal to one another to adjacent touch electrodes... deriving self-capacitances and mutual capacitances from sensing signals
Data Source
AI summary
The present disclosure relates to touch display device and touch driving methods, and more specifically, to a touch display device and a touch driving method for accurately performing touch sensing by applying touch driving signals orthogonal to one another to adjacent touch electrodes.