Stacked Mesh Touch Panel Layout for Narrow Bezel Sensing
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Solution Overview
Problem
Existing touch panels face challenges in frame narrowing due to the need for space to accommodate wiring lines, which affects detection sensitivity and makes it difficult to reduce the peripheral region not used for touch detection.
Innovation Solution
A touch panel configuration with laminated conductive layers and connecting portions through an insulating layer, allowing wiring lines to be led out in the same direction, reducing the peripheral region and improving sensitivity by using mesh patterns and connecting portions for reliable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wiring lines are led out from end portions of detection electrodes in both first and second directions, then electrical connectivity is ensured, but the peripheral region cannot be narrowed
Solution Approach 1:
The patent transitions from planar wiring arrangement to three-dimensional stacked conductive layers. Multiple conductive layers are arranged in the thickness direction (vertical dimension) to provide redundant electrical connection paths, allowing wiring to be led out in a single direction while maintaining connectivity through vertical stacking. This dimensional transition resolves the conflict between reducing peripheral area and ensuring electrical reliability.
Solution Approach 2:
The patent implements nested conductive layers where multiple conductive patterns are stacked within the same planar footprint. The conductive layers are positioned at different heights (thickness direction) and connected via through-holes, creating a nested structure that provides multiple electrical connection paths without expanding the peripheral region. This nesting approach maintains electrical connectivity while minimizing the area occupied by wiring.
2Area of stationary object
If peripheral region is narrowed, then frame narrowing is achieved, but space for wiring lines becomes insufficient
Solution Approach 1:
The patent utilizes the thickness direction to accommodate multiple conductive layers and their interconnections. By stacking conductive patterns vertically and connecting them through through-holes, the design provides sufficient wiring capacity without expanding the planar peripheral region. This vertical arrangement enables frame narrowing while maintaining manufacturability of the wiring structure.
Solution Approach 2:
The patent employs thin conductive film layers deposited on substrates, allowing complex wiring patterns to be formed within limited thickness. The flexible thin-film fabrication process enables creation of multiple stacked conductive layers with precise patterns, providing adequate wiring capacity in a compact vertical structure that narrows the peripheral region.
3Reliability
If multiple conductive layers are stacked, then electrical connectivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the electrical connection function into multiple segmented conductive layers, each performing a specific connection task. By segmenting the wiring into separate layers that can be independently patterned and connected through through-holes, the design achieves reliable electrical connectivity while managing manufacturing complexity through modular layer construction.
Solution Approach 2:
The stacked conductive layers serve multiple functions simultaneously: providing electrical connections, enabling frame narrowing, and offering redundant connection paths. This multi-functionality justifies the increased structural complexity by delivering multiple benefits from a single integrated approach, improving overall system efficiency.
Data Source
AI summary
A touch panel that makes it possible to narrow a peripheral region not used for touch detection. The touch panel includes a first conductive layer consisting of a first fine metal wire, an insulating layer, and a second conductive layer consisting of a second fine metal wire that are sequentially laminated, where the first conductive layer has first detection electrodes, first dummy electrodes, and second wiring lines that are disposed on the first dummy electrode, the second conductive layer has second detection electrodes, connecting portions that penetrate the insulating layer and connect the second detection electrodes and the second wiring lines to each other are provided, a mesh pattern is composed of the first fine metal wire and the second fine metal wire, and the second wiring lines and the second detection electrodes corresponding to each other are connected to each other by two or more of the connecting portions.