Sheet-like conductor with asymmetric detection electrode line widths
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Solution Overview
Problem
Conductive sheets with equal line widths for detection electrodes on both sides of a touch panel display are visually noticeable when the power is off, leading to visibility issues and reduced transmittance.
Innovation Solution
A sheet-like conductor with a first detection electrode on the viewing side and a second detection electrode on the opposite side, where the line width of the second detection electrode is smaller than the first, within specific ranges (0.5 μm ≤ Wb < Wa ≤ 10 μm and Wa - Wb ≤ 4.0 μm), to improve visibility without compromising transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the line width of the thin metal wire of the first detection electrode and the second detection electrode are made equal, then the manufacturing process is simplified, but the thin metal wires become visually noticeable when the power is off
Solution Approach 1:
The patent applies local quality by making the line width of the thin metal wire different for the first detection electrode and the second detection electrode. Specifically, the line width of the thin metal wire of the first detection electrode is made larger than that of the second detection electrode, so that when viewed from the observer's side, the thin metal wires are not visually noticeable, while maintaining ease of manufacture through a systematic design approach
2Object-affected harmful factors
If the line width of the thin metal wire of the second detection electrode is made smaller than the first, then the visibility of thin metal wires is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by systematically varying the line width parameter of the thin metal wire between the first and second detection electrodes. The line width of the thin metal wire of the first detection electrode is set to be larger than that of the second detection electrode, with specific ranges defined to balance visibility improvement with manufacturability. This parameter differentiation resolves the contradiction by achieving better visibility while maintaining reasonable manufacturing precision through established fabrication processes
3Object-affected harmful factors
If the line width of the thin metal wire is reduced to improve visibility, then the transmittance of the conductive sheet deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the line width of thin metal wires in different locations (first detection electrode versus second detection electrode). The line width of the thin metal wire of the first detection electrode is made larger than that of the second detection electrode, which allows the conductive sheet to maintain adequate transmittance while improving visibility performance from the observer's perspective
Data Source
AI summary
A sheet-like conductor that is arranged on a display screen includes at least an insulator, a first detection electrode that is placed on a surface of the insulator on an opposite side to the display screen and arranged on a viewing side, and a second detection electrode that is placed on a surface of the insulator on a side close to the display screen and arranged on an opposite side to the viewing side, in which the first detection electrode and the second detection electrode are formed of thin metal wires in a mesh shape, and when a line width of the thin metal wire of the first detection electrode is a line width Wa and a line width of the thin metal wire of the second detection electrode is a line width Wb, the line width Wa and the line width Wb satisfy the following expressions (1) and (2).0.5 μm≤Wb<Wa≤10 μm (1)Wa−Wb ≤4.0 μm (2)