Carbon Nanotube Transparent Conductive Layer for Touch Panels
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Solution Overview
Problem
Existing electronic devices, such as touch panels and displays, face challenges with indium tin oxide (ITO) layers due to their complex formation methods, poor mechanical durability, low chemical endurance, and uneven electrical resistance.
Innovation Solution
A transparent conductive layer formed by adhering carbon nanotubes together using van der Waals attractive forces, which are aligned and stacked to provide high transparency, mechanical strength, and uniform electrical conductivity, eliminating the need for vacuum environments and heat processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO layer is formed by ion-beam sputtering, then transparent conductive layer can be formed, but the formation method is relatively complicated and has poor mechanical durability
Solution Approach 1:
The patent replaces the mechanical ion-beam sputtering process with a chemical method using carbon nanotubes. The carbon nanotubes are deposited onto the substrate to form a transparent conductive layer, eliminating the need for complex vacuum-based ion beam equipment and processes while providing superior mechanical durability and flexibility.
Solution Approach 2:
The patent uses carbon nanotubes as a composite material to form the transparent conductive layer. This composite approach combines the electrical conductivity needed for touch panels with the mechanical strength and flexibility of carbon nanotube structures, overcoming the brittleness and poor mechanical properties of traditional ITO layers.
2Reliability
If ITO layer is used as transparent conductive layer, then electrical conductivity can be achieved, but chemical endurance is low
Solution Approach 1:
The patent changes the material parameter from indium tin oxide to carbon nanotubes. This parameter change provides superior chemical endurance and stability while maintaining the necessary electrical conductivity for touch panel applications, eliminating the chemical degradation issues associated with ITO.
3Reliability
If ITO layer is used, then transparent conductive properties can be achieved, but electrical resistance distribution is uneven
Solution Approach 1:
The patent achieves homogeneous electrical resistance distribution through the uniform deposition of carbon nanotubes across the substrate surface. The carbon nanotube network provides consistent electrical properties throughout the transparent conductive layer, eliminating the uneven resistance distribution problems found in ITO layers.
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 carbon nanotube-based transparent conductive layer offers improved mechanical durability, uniform electrical resistance, and high transparency, making it suitable for applications like touch panels and displays while reducing production costs and environmental impact.
Implementation Method 1
Carbon nanotubes in the carbon nanotube layer are adhered together by the van der Waals attractive force therebetween
Data Source
AI summary
An electronic element includes a substrate, and a transparent conductive layer. The substrate includes a surface. The transparent conductive layer is formed on a surface of the substrate. The transparent conductive layer includes at least one carbon nanotube layer. Carbon nanotubes in the carbon nanotube layer are adhered together by the van der Waals attractive force therebetween.