Ag-Pd-Nd Alloy Touch Panel Oxidation Resistance
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Solution Overview
Problem
Existing touch panels face issues with oxidation stability, particularly in high-temperature and high-humidity environments, leading to degradation of electrical characteristics due to oxidation and staining from components like sweat and salt.
Innovation Solution
A touch panel incorporating a Ag—Pd—Nd alloy layer with specific weight percentages of Ag, Pd, and Nd, formed on a transparent substrate using sputtering, which enhances oxidation stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper or silver is used as metal coating layer, then electrical conductivity is improved, but oxidation stability deteriorates in high-temperature and high-humidity environment
Solution Approach 1:
The patent applies composite materials by creating a multi-layer structure consisting of a transparent conductive layer and a metal layer deposited thereon. This composite structure combines the transparency and conductivity of the transparent conductive material with the electrical conductivity of the metal layer, while the specific deposition conditions and material selection prevent oxidation and staining, thus resolving the contradiction between electrical conductivity and oxidation stability.
2Illumination intensity
If metal deposition method is used with thickness of 0.3 μm or less, then transparency is improved, but oxidation resistance deteriorates due to thin metal layer
Solution Approach 1:
The patent applies parameter changes by optimizing the deposition conditions including temperature, pressure, and deposition rate to control the microstructure and properties of the metal layer. By changing these parameters, the metal layer achieves both sufficient thickness for oxidation resistance and appropriate thinness for maintaining transparency, thus resolving the contradiction between light transmission and oxidation resistance.
3Manufacturing precision
If silver paste printing method is used, then circuit thickness of 50 μm or more is achieved, but manufacturing complexity increases and is difficult for thin circuits
Solution Approach 1:
The patent applies mechanics substitution by replacing the mechanical silver paste printing process with a physical vapor deposition process. This substitution eliminates the need for paste printing, stenciling, and curing steps, enabling precise control of circuit thickness through deposition parameters alone, and making the process suitable for thin circuits (0.3 μm or less) that are difficult to manufacture using traditional printing methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The Ag—Pd—Nd alloy layer provides excellent surface characteristics and oxidation stability, extending the lifespan of the touch panel by resisting oxidation, humidity, and heat, while improving heat stability and surface quality.
Implementation Method 1
formed on a transparent substrate using sputtering
Data Source
AI summary
Provided is a touch panel comprising: a transparent substrate, a transparent conductive material disposed on the 5 substrate, and a Ag—Pd—Nd alloy layer disposed on the transparent conductive material. Provided are also a preparation method of the touch panel and a display comprising the touch panel. Provided are also a Ag—Pd—Nd alloy for touch panel, comprising: 97.9 to 99.2 weight % of Ag, 0.7 to 1.8 weight % of Pd, and 0.1 to 0.3 weight % of Nd, based on 100 weight % of the alloy.