Touch Panel Conductive Member with Auxiliary Wires
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Solution Overview
Problem
Touch panels with mesh electrodes made of fine metal wires face issues with insulation due to reduced electrode width, leading to decreased sensitivity and functionality, especially when detecting smaller stylus tips.
Innovation Solution
A conductive member for touch panels is designed with a substrate and electrodes formed by fine metal wires, where auxiliary fine metal wires are electrically connected to the main wires at specific angles and widths, ensuring the electrode width is no more than 2.5 times the mesh pitch, and the auxiliary wire is arranged to prevent disconnection and enhance conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electrode width is reduced to improve position detection accuracy (high definition), then the detection electrode becomes insulated due to disconnection of the fine metal wire, resulting in decreased sensitivity and functionality
Solution Approach 1:
The patent changes the geometric parameters of the mesh electrode, specifically setting the electrode width Wa to satisfy Wa≤2.5P1 where P1 is the mesh pitch. This parameter optimization allows the electrode to maintain sufficient conductivity while achieving high position detection accuracy with reduced electrode width
Solution Approach 2:
The patent introduces auxiliary fine metal wires that extend in the first direction (parallel to the electrode length) to provide additional conduction paths. This adds a dimensional aspect to the electrode structure, creating multiple parallel conduction routes that prevent insulation even when the main mesh structure is narrowed
2Measurement precision
If the electrode width is reduced to detect smaller stylus tips, then the fine metal wire disconnects and the touch panel loses functionality
Solution Approach 1:
The patent optimizes the mesh pitch P1 and electrode width Wa parameters, establishing the relationship Wa≤2.5P1. This parameter configuration enables the electrode to detect smaller stylus tips while maintaining sufficient wire connectivity and panel functionality
Solution Approach 2:
The auxiliary fine metal wires extending in the first direction provide redundant conduction paths that ensure the touch panel remains functional even when the electrode width is reduced for detecting smaller stylus tips
3Measurement precision
If the electrode width is reduced to achieve high definition, then the sensitivity decreases due to insulation
Solution Approach 1:
The patent establishes the parameter relationship Wa≤2.5P1 where Wa is electrode width and P1 is mesh pitch. This optimized parameter configuration enables high definition while preventing insulation that would reduce sensitivity
Solution Approach 2:
The auxiliary fine metal wires provide additional conduction dimensions, ensuring that sensitivity is maintained even when the electrode width is reduced for high definition performance
Data Source
AI summary
A conductive member for a touch panel has a first electrode formed on a substrate and extending in parallel to a first direction, in which the first electrode is electrically connected to a plurality of first mesh cells constituted by a fine metal wire, the fine metal wire is not parallel or perpendicular with respect to a first direction, the first electrode has at least one auxiliary fine metal wire that extends in a first direction, intersects the fine metal wire, is electrically connected to the fine metal wire, and is not parallel to the fine metal wire, and an electrode width Wa of the first electrode in a second direction orthogonal to a first direction and a first mesh pitch P1 of the first mesh cell in a second direction satisfy Wa≤2.5P1.