Carbon Nanotube Touch Panel Conductive Layer
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Solution Overview
Problem
Conventional resistance-type touch panels with ITO layers suffer from poor durability, low chemical endurance, uneven resistance, and low transparency, resulting in low sensitivity, accuracy, and brightness.
Innovation Solution
The touch panel employs carbon nanotube layers formed by pressing a super-aligned array of carbon nanotubes onto substrates, with the carbon nanotubes arranged isotropically or in specific directions to create conductive layers that are durable, conductive, and transparent, and includes a shielding layer to prevent electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion-beam sputtering is used to form ITO conductive layers, then the touch panel can be manufactured with conventional processes, but the ITO layer exhibits poor durability, low chemical endurance, and uneven resistance
Solution Approach 1:
The patent changes the material parameter from ITO (indium tin oxide) to carbon nanotubes, fundamentally altering the chemical composition and physical properties of the conductive layer. This material substitution resolves the durability and chemical endurance issues while maintaining manufacturability through alternative deposition techniques.
Solution Approach 2:
The patent employs carbon nanotubes as a composite material structure, utilizing the unique properties of nanoscale carbon structures to achieve superior electrical conductivity, mechanical strength, and chemical stability compared to conventional ITO materials.
2Illumination intensity
If ITO layers are used in touch panels, then the manufacturing process is established and conventional, but the transparency and brightness are relatively low
Solution Approach 1:
The patent changes the optical parameter by substituting ITO with carbon nanotubes, which have superior optical transparency in the visible spectrum. This material change increases light transmission and panel brightness while the nanotube alignment techniques maintain manufacturing feasibility.
3Manufacturing precision
If ITO conductive layers are used, then the touch panel can be manufactured with existing processes, but the resistance distribution is uneven and sensitivity is low
Solution Approach 1:
The patent changes the electrical parameter by using carbon nanotubes with inherently more uniform charge distribution and lower contact resistance. The nanotube network structure provides consistent resistance across the touch panel surface, improving both manufacturing precision and operational sensitivity.
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 touch panel offers improved durability, sensitivity, accuracy, and brightness, with uniform resistance distribution and high electrical conductivity, while simplifying the manufacturing process and reducing costs.
Implementation Method 1
The touch panel employs carbon nanotube layers formed by pressing a super-aligned array of carbon nanotubes onto substrates
Implementation Method 2
pressing a super-aligned array of carbon nanotubes onto substrates
Data Source
AI summary
A method for making a touch panel is provided. The method includes providing at least one array of carbon nanotubes, a first substrate, and a second substrate. The at least one array of carbon nanotubes is pressed by using a pressing device to form a carbon nanotube structure. A first electrode plate is formed on the first substrate and a second electrode plate on the second substrate. Two first-electrodes are located on opposite sides of the first electrode plate and two second-electrodes on opposite sides of the second electrode plate. The first electrode plate is spaced a distance from the second electrode plate such that the first conductive layer and the second conductive layer face each other.