In-Cell Touch Electrode Noise Reduction via Differential Signaling
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Solution Overview
Problem
In-cell touch control display panels face challenges in accurately detecting touch events due to noise interference, which complicates the detection of signal interest and reduces the signal-to-noise ratio.
Innovation Solution
A touch control structure comprising a first touch electrode and a second touch electrode, connected to a difference operator and an inverter, performs a difference operation on signals from both electrodes to offset noise, enhancing the signal-to-noise ratio and improving touch event detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If in-cell touch control technology is used to integrate the touch sensor within the display unit, then the assembly procedure is simplified, but noise interference increases and signal-to-noise ratio decreases
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes (first touch sub-electrode, second touch sub-electrode, third touch sub-electrode) with different sensing areas. This segmentation allows differential signaling to be implemented, where signals from sub-electrodes with similar noise environments are combined while subtracting common-mode noise, thereby reducing noise interference while maintaining the integrated in-cell structure.
Solution Approach 2:
The patent converts the harmful noise interference into a beneficial effect by using differential signaling. The noise that affects multiple sub-electrodes similarly is treated as common-mode signal that can be subtracted out, transforming the harmful noise into a removable artifact and improving the signal-to-noise ratio.
2Ease of manufacture
If in-cell touch control technology is used to integrate the touch sensor within the display unit, then the assembly procedure is simplified, but touch event detection accuracy decreases
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes with different sensing areas. By segmenting the electrode and using differential signaling between sub-electrodes, the system can distinguish actual touch signals from noise more effectively, thereby improving touch event detection accuracy while maintaining the simplified in-cell integration.
Solution Approach 2:
The patent implements a feedback mechanism where signals from multiple sub-electrodes are processed through differential amplification. The output of the difference operator provides feedback information that enhances the detection accuracy by continuously comparing and differentiating between signals from different sub-electrodes, allowing for more precise touch event detection.
3Object-affected harmful factors
If multiple sub-electrodes with different sensing areas are used to reduce noise, then signal-to-noise ratio is enhanced, but device complexity increases
Solution Approach 1:
The patent merges multiple sub-electrodes into a single integrated touch electrode structure that is formed within the display panel's existing electrode layer. This combining approach reduces device complexity by integrating multiple functional elements into a unified structure rather than using separate components, while still achieving noise reduction through differential signaling.
Solution Approach 2:
The touch electrode structure serves multiple functions: it acts as both the display electrode and the touch sensing electrode, and different portions of the same electrode serve as first, second, and third sub-electrodes with different sensing areas. This multi-functionality reduces the need for additional separate components, thereby reducing device complexity while achieving noise reduction.
Data Source
AI summary
The present application discloses a touch control structure comprising a first touch electrode comprising a first touch sub-electrode and a second touch sub-electrode. A sensing area of the first touch sub-electrode is substantially the same as a sensing area of the second touch sub-electrode.