Touch Panel Electrode Configuration for Non-Rectangular Shapes
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Solution Overview
Problem
Existing touch panels face challenges in achieving uniform touch sensitivity and efficient wiring for non-rectangular shapes, particularly due to poor edge sensitivity and difficulties in distributing touch sensing electrodes with desirable density.
Innovation Solution
The implementation of three intersecting touch electrode series with distinct directional extensions allows for adaptation to hexagonal or circular substrates, reducing the number of electrodes and leads, and incorporating extra connection cables to enhance edge sensitivity, while minimizing the area requirement for the peripheral region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional rectangular touch panel wiring is used for non-rectangular shapes, then manufacturing complexity increases, but touch sensitivity at edges deteriorates
Solution Approach 1:
The touch electrode series are divided into multiple portions (first portion and second portion) that extend along different directions and intersect to form triangular regions. This segmentation allows the electrodes to adapt to non-rectangular panel shapes while maintaining uniform distribution and edge sensitivity.
Solution Approach 2:
The touch electrode series are configured with asymmetric directional extensions (first direction, second direction, third direction) that are specifically designed to match the geometric characteristics of non-rectangular panels, enabling optimal electrode distribution for hexagonal or circular shapes rather than forcing rectangular wiring patterns.
2Manufacturing precision
If more touch electrode series are added to achieve uniform distribution, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
Each touch electrode series serves multiple functions by having portions that both define triangular regions and provide sensing capability. The intersecting portions of adjacent electrode series collectively define the triangular regions, allowing each series to contribute to both boundary definition and sensing, thereby reducing the total number of series needed.
Solution Approach 2:
The electrode series extend in multiple directions (first direction, second direction, third direction) rather than单一方向, creating a two-dimensional intersecting pattern that efficiently covers the panel area. This multi-directional arrangement achieves uniform distribution with fewer electrodes by utilizing spatial intersections rather than dense parallel lines.
3Reliability
If lead distribution is expanded to cover entire peripheral area, then edge sensitivity improves, but area requirement increases
Solution Approach 1:
The peripheral area is segmented into regions where lead structures are selectively placed. Instead of continuous lead distribution around the entire perimeter, leads are concentrated in specific areas (such as along the first direction) where they can effectively serve multiple electrode series, reducing total lead area while maintaining sensitivity.
Solution Approach 2:
Multiple electrode series share common lead structures. The lead structures connected to touch electrode series in the first direction are merged and shared by multiple series, allowing a single lead structure to serve multiple sensing functions and reducing the overall lead area required.
Data Source
AI summary
A touch panel includes a substrate, first to third touch electrode series, and a plurality of insulation patterns. The first touch electrode series includes first and second portions respectively extending along first and second directions. The second touch electrode series includes third and fourth portions respectively extending along third and second directions. The third portion intersects with the first portion of the first touch electrode series. The third touch electrode series includes fifth and sixth portions respectively extending along the first and third directions. The fifth and sixth portions respectively intersect with the fourth portion of the second touch electrode series and the second portion of the first touch electrode series. The first to third directions are different from each other. The plurality of insulation patterns respectively insulate the first touch electrode series from the second touch electrode series, the second touch electrode series from the third touch electrode series, and the first touch electrode series from the third touch electrode series.