Mesh Touch Panel Wiring Layout for Narrow Bezel Sensing
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Solution Overview
Problem
Existing touch panels face challenges in achieving frame narrowing due to the need for space to accommodate wiring lines, which hinders the reduction of the peripheral region not used for touch detection.
Innovation Solution
A touch panel configuration with laminated conductive layers and insulating layers, featuring detection electrodes, dummy electrodes, and connecting portions that allow wiring lines to be led out in the same direction, reducing the peripheral region by integrating wiring lines into a mesh pattern within the touch region.
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 connections are established, but the peripheral region cannot be narrowed
Solution Approach 1:
The patent transitions from planar wiring layout to three-dimensional stacked wiring layers. Multiple wiring lines are arranged in different layers (first wiring line layer, second wiring line layer, third wiring line layer) to lead out from the same end portion of detection electrodes, utilizing the vertical dimension to resolve the contradiction between reducing peripheral area and maintaining wiring connectivity
Solution Approach 2:
The wiring structure is segmented into multiple independent wiring line layers, each containing specific wiring lines that lead out in different directions. This segmentation allows wiring lines to be organized systematically across layers, enabling compact peripheral region design while maintaining all necessary electrical connections
2Reliability
If multiple wiring lines are led out in different directions, then electrical connections are established, but device complexity increases
Solution Approach 1:
Multiple wiring lines that would otherwise require separate routing paths are merged into a unified stacked layer structure. The wiring lines in different layers are positioned to lead out from the same end portion of detection electrodes, combining multiple connection functions into a compact vertical arrangement that reduces overall structural complexity
Solution Approach 2:
Insulating layers serve as intermediaries between adjacent wiring line layers, enabling electrical isolation while maintaining spatial proximity. This intermediary structure allows multiple wiring lines to be densely packed in the vertical direction without electrical interference, reducing device complexity while ensuring reliable connections
Data Source
AI summary
A touch panel that makes it possible to narrow a peripheral region which is not used for touch detection. The touch panel has a configuration in which 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 are sequentially laminated, 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, the first fine metal wire and the second fine metal wire are combined with each other to constitute a mesh pattern, and the second wiring line constitutes a part of the mesh pattern.