Touch Panel Electrode Asymmetry for Moire Fringe Suppression
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Solution Overview
Problem
Conventional touch panels struggle to suppress the appearance of moire fringes while effectively eliminating undesired electrode images when used in mutual capacitive touch screens, as they either fail to remove electrode images or introduce moire fringes due to the design of their electrodes and dummy patterns.
Innovation Solution
A touch panel design featuring intersecting first and second touch electrodes with sub-electrodes arranged in strip-shaped configurations, where the extension directions of these electrodes are not on the same straight line, combined with polyline-shaped gaps and a light-shielding matrix, which helps in suppressing moire fringes by creating irregularly arranged portions of gaps, thereby reducing the visibility of electrode images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrodes with relatively small sizes are used to reduce electrode images, then electrode image elimination is improved, but moire fringes appear when applied to mutual capacitive touch screens
Solution Approach 1:
The patent applies asymmetry by configuring the first and second sub-electrodes to extend in different directions (not collinearly), creating an asymmetric electrode structure. This asymmetric arrangement disrupts the periodicity that causes moire fringes while maintaining the electrode image elimination effect of small-sized electrodes
Solution Approach 2:
The patent introduces a dimensional aspect by arranging sub-electrodes in multiple directions rather than a single linear arrangement. The first sub-electrode extends in a first direction while the second sub-electrode extends in a second direction, adding spatial dimensionality that prevents moire fringe formation
2Ease of manufacture
If conventional touch panel designs are used, then manufacturing is simpler, but they cannot suppress moire fringes while ensuring elimination of undesired electrode images
Solution Approach 1:
The patent segments the electrode structure into multiple sub-electrodes (first sub-electrode and second sub-electrode) that are electrically coupled. This segmentation allows each sub-electrode to be optimized independently for its specific function while collectively achieving both electrode image elimination and moire fringe suppression
Data Source
AI summary
A touch panel includes a substrate, a first touch electrode disposed over the substrate and including a first sub-electrode and a second sub-electrode electrically coupled to each other, and a second touch electrode disposed over the substrate and intersecting the first touch electrode. The first sub-electrode and the second sub-electrode are arranged in an extension direction of the first touch electrode. The first sub-electrode includes a first strip-shaped electrode. The second sub-electrode includes a second strip-shaped electrode. An angle between an extension direction of the first strip-shaped electrode and an extension direction of the second strip-shaped electrode is non-zero.