Carbon Nanotube Touch Panel for Portable Computer Durability
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Solution Overview
Problem
Conventional capacitance-type or resistive-type touch panels in portable computers face issues with mechanical durability, chemical endurance, uniform resistance, transparency in humid environments, sensitivity, accuracy, and brightness due to the use of indium tin oxide (ITO) layers, which are also complex to form.
Innovation Solution
The implementation of carbon nanotube-based touch panels, where transparent conductive layers made of ordered or disordered carbon nanotube films provide improved mechanical strength, uniform conductivity, and high transparency, integrated with resistive or capacitive touch panel designs to enhance durability and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indium tin oxide (ITO) layers are used in conventional touch panels, then the panels can achieve basic transparency and conductivity, but the mechanical durability, chemical endurance, and uniform resistance are poor
Solution Approach 1:
The patent changes the material parameter from indium tin oxide (ITO) to carbon nanotubes (CNTs). This material substitution fundamentally improves mechanical durability and chemical endurance while maintaining transparency and conductivity. The carbon nanotube structure provides superior mechanical strength and uniform resistance distribution compared to conventional ITO layers.
Solution Approach 2:
The patent employs carbon nanotube films as a composite transparent conductive layer. The carbon nanotubes form a network structure that combines mechanical strength, electrical conductivity, and optical transparency. This composite material approach replaces the single-material ITO layer with a multi-component carbon nanotube system that achieves superior overall performance.
2Illumination intensity
If indium tin oxide (ITO) layers are used in conventional touch panels, then the panels can function as transparent conductive layers, but the transparency deteriorates in humid environments
Solution Approach 1:
The patent changes the material composition from ITO to carbon nanotubes, which fundamentally alters the chemical stability properties. Carbon nanotubes exhibit superior chemical endurance and do not deteriorate in humid environments, maintaining both transparency and conductivity under various environmental conditions.
3Measurement precision
If indium tin oxide (ITO) layers are used in conventional touch panels, then the panels can be manufactured, but the sensitivity and accuracy are reduced due to uneven resistance
Solution Approach 1:
The patent changes the conductive material to carbon nanotubes, which inherently provide more uniform resistance distribution across the touch panel surface. This uniformity improves touch accuracy and sensitivity by ensuring consistent electrical response across the entire panel area.
4Strength
If indium tin oxide (ITO) layers are used in conventional touch panels, then the panels can achieve basic conductive functionality, but the mechanical strength is insufficient
Solution Approach 1:
The patent changes the material from brittle ITO to flexible carbon nanotube films. This material parameter change provides superior mechanical strength and flexibility, allowing the touch panel to withstand mechanical stress and deformation while maintaining its conductive and transparent properties.
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 touch panels offer superior mechanical strength, uniform resistance, and high transparency, resulting in improved sensitivity and accuracy, while being easier to manufacture and more durable than traditional ITO-based panels.
Implementation Method 1
transparent conductive layers made of ordered or disordered carbon nanotube films provide improved mechanical strength, uniform conductivity
Implementation Method 2
Each of the carbon nanotube films includes a number of successively oriented carbon nanotubes joined end to end by the van der Waals attractive force therebetween
Data Source
AI summary
A portable computer includes a display panel having a display surface and a touch panel. The touch panel is disposed on the display surface and comprises at least one transparent conductive layer. The transparent conductive layer includes a carbon nanotubes layer having a carbon nanotube film.