Touch Panel Mesh Wiring for Narrow Peripheral Frames
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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 hinders the reduction of the peripheral region not used for touch detection, and this can lead to increased electric resistance and decreased detection sensitivity.
Innovation Solution
A touch panel configuration with laminated conductive layers and connecting portions that allow wiring lines to be led out in the same direction, utilizing a first and second mesh pattern to connect detection electrodes and wiring lines through multiple connecting portions, reducing the need for additional space and improving sensitivity.
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 layout to three-dimensional stacked conductive layers. Multiple conductive layers are arranged in the thickness direction (vertical dimension) to provide multiple wiring paths, allowing wiring lines to be led out primarily in one direction while maintaining electrical connectivity through vertical stacking, thus enabling peripheral region narrowing without sacrificing connectivity reliability
Solution Approach 2:
The patent implements nested conductive layers where multiple conductive layers are stacked within the thickness direction of the touch panel. Each conductive layer contains wiring lines that are electrically connected through the stacked structure, creating a nested arrangement where wiring functions are embedded within the vertical stack, reducing the horizontal space required for wiring
2Shape
If peripheral region is narrowed for frame narrowing, then aesthetic appearance is improved, but wiring line accommodation becomes difficult
Solution Approach 1:
The patent utilizes the thickness direction (vertical dimension) to accommodate wiring lines by stacking multiple conductive layers. This vertical arrangement allows wiring lines to be positioned within the panel thickness rather than requiring extensive peripheral space, enabling frame narrowing while maintaining wiring accommodation capability
Solution Approach 2:
The patent employs thin film conductive layers that can be deposited and patterned on flexible substrates. These thin film structures allow wiring lines to be integrated within the panel's thickness without requiring additional peripheral space, facilitating narrow frame design while maintaining manufacturing feasibility through standard thin film fabrication processes
3Measurement precision
If wiring lines are arranged in both first and second directions, then detection sensitivity is maintained, but electric resistance increases
Solution Approach 1:
The patent reduces electric resistance by arranging wiring lines in multiple conductive layers stacked in the vertical direction rather than extending wiring lines in both horizontal directions. This vertical stacking shortens the current path length and reduces the total wire length required, thereby lowering electric resistance while maintaining detection sensitivity through the preserved grid pattern of detection electrodes
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.