Mesh Touch Electrode Asymmetry for Noise-Resistant Sensing
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Solution Overview
Problem
Capacitance-based touch-sensing schemes in touch display devices face challenges with noise interference, leading to reduced touch sensitivity, especially in slim designs where electrodes are closer to the display part, causing inaccuracies in detecting touch coordinates.
Innovation Solution
The implementation of a touch electrode outline structure with protrusions and varying shapes between adjacent electrodes to increase mutual capacitance, enhancing touch sensitivity while maintaining a slim design and reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitance-based touch-sensing scheme is used, then touch sensing capability is provided, but noise interference reduces touch sensitivity
Solution Approach 1:
The touch electrode is divided into multiple segments with different shapes (e.g., protrusions and recesses) to increase the effective sensing area and mutual capacitance, thereby improving touch sensitivity while maintaining noise rejection capabilities
Solution Approach 2:
Adjacent touch electrodes are designed with asymmetric or different shapes rather than identical patterns. This asymmetry increases the mutual capacitance between electrodes and enhances the sensing signal, making it more robust against noise interference
2Length of stationary object
If electrodes are placed closer to the display part for slim design, then device thickness is reduced, but noise interference increases
Solution Approach 1:
The electrode structure is segmented into multiple regions with varying geometries, which increases the effective capacitance area without increasing the physical thickness of the device, thereby maintaining slim profile while improving noise robustness
Solution Approach 2:
The electrode geometry parameters (shape, size, distribution) are optimized to maximize mutual capacitance in a thin configuration, enabling effective touch sensing with reduced device thickness while maintaining immunity to noise
3Measurement precision
If mutual capacitance is increased for better touch sensitivity, then touch sensitivity improves, but device structure becomes more complex
Solution Approach 1:
The electrode is segmented into geometric patterns (protrusions, recesses, interdigitated structures) that increase mutual capacitance through enhanced electric field coupling, achieving high touch sensitivity while using standard fabrication processes
Solution Approach 2:
The electrode design utilizes two-dimensional geometric patterns (shapes, orientations, distributions) to maximize capacitance coupling between adjacent electrodes, achieving high sensitivity without adding third-dimensional complexity or thickness
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 and noise-robust touch sensing by increasing the mutual capacitance value, improving touch sensitivity and maintaining the slim design of touch display devices.
Implementation Method 1
capacitance-based touch-sensing scheme... determine the presence or absence of a user's touch, and to correctly detect touch coordinates... based on a change in capacitance formed at a plurality of touch electrodes
Data Source
AI summary
A touch display device can include a touch panel including a plurality of touch electrodes including a first touch electrode and a second touch electrode, the first touch electrode being adjacent to and electrically isolated from the second touch electrode; and a touch-sensing circuit configured to drive the touch panel and sense a touch or touch coordinates, in which an outline portion of the first touch electrode and an outline portion of the second touch electrode have different shapes within a boundary area between the first touch electrode and the second touch electrode.