Touch Substrate Mesh Dummy Electrodes Reduce Capacitance
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Solution Overview
Problem
Touch display apparatuses with metal mesh structures face issues such as high resistance-capacitance delay and signal transmission speed due to high mutual capacitance between touch electrodes, and display effects are compromised by visible mesh patterns and optical non-uniformity.
Innovation Solution
A touch substrate with first and second touch electrodes featuring mesh structures and dummy electrodes, where the dummy electrodes are insulated and arranged to reduce wire density and capacitance, and are designed to prevent charge accumulation and facilitate charge dissipation, improving signal transmission speed and optical uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If metal mesh structures are used for touch electrodes, then signal transmission speed is improved, but mutual capacitance increases causing resistance-capacitance delay
Solution Approach 1:
The touch electrode is segmented into a mesh structure with multiple conductive lines forming grid patterns. By dividing the continuous electrode into discrete mesh segments, the mutual capacitance between adjacent electrodes is reduced while maintaining signal transmission pathways, thereby decreasing resistance-capacitance delay
Solution Approach 2:
The mesh structure implements local quality variations by adjusting line density and spacing in different regions. Areas with higher mutual capacitance can have increased spacing or reduced line density, while maintaining adequate signal transmission in other regions, optimizing the balance between speed and delay
2Reliability
If mesh structures are used for touch electrodes, then touch sensitivity is improved, but visible mesh patterns reduce display quality
Solution Approach 1:
The mesh structure transitions from a two-dimensional planar pattern to a three-dimensional configuration by incorporating dummy electrodes that extend vertically or in multiple layers. This dimensional change allows the mesh to be less visible while maintaining its touch sensitivity function, as the structure interacts with touch in 3D space rather than just 2D plane
Solution Approach 2:
Dummy electrodes serve as intermediary elements between the functional mesh structure and the display surface. These additional electrodes mediate the optical interaction by filling in visual gaps and creating a more uniform appearance, while the underlying mesh continues to provide touch sensitivity
3Area of stationary object
If higher density mesh structures are used, then touch electrode coverage is improved, but optical non-uniformity increases
Solution Approach 1:
The invention changes key parameters of the mesh structure including line width, spacing, and pattern geometry to optimize the balance between coverage and optical uniformity. By adjusting these parameters, the electrode coverage area is maximized while the visual impact is minimized, achieving both electrical and optical performance
Data Source
AI summary
A touch substrate includes a substrate; a plurality of first touch electrodes disposed on the substrate and extending in a first direction; and a plurality of second touch electrodes disposed on the substrate and extending in a second direction intersecting with the first direction. The plurality of second touch electrodes are insulated from the plurality of first touch electrodes. Each first touch electrode and each second touch electrode both include a mesh structure and a plurality of first dummy electrodes; each first dummy electrode includes at least two line segments; the at least two line segments intersect with each other and have no closed region therebetween.