Cross-linked Polymer Coating for Scratch Resistant Touch Sensors
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Solution Overview
Problem
Touch screen technologies, particularly those using Indium Tin Oxide (ITO), face issues with fragility, limited supply, rising costs, and susceptibility to scratches and breakage due to the lack of flexibility and high conductivity, necessitating additional protective measures like glass covers which compromise flexibility.
Innovation Solution
A scratch-resistant touch sensor is developed with a transparent dielectric substrate and conductive layers, featuring a cross-linked polymer structure applied as a protective coating to enhance mechanical strength and prevent scratches without the need for additional isolating covers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass covers are used to protect the touch sensor, then scratch resistance is improved, but flexibility deteriorates and breakage susceptibility increases
Solution Approach 1:
The patent changes the material parameters by replacing traditional glass or polyester covers with a polymeric protective layer that has been chemically modified through cross-linking. This cross-linking process creates a three-dimensional polymer network that fundamentally alters the material's mechanical properties, achieving both flexibility and scratch resistance simultaneously.
Solution Approach 2:
The patent employs composite material structure by combining the conductive ITO layer with a cross-linked polymeric protective coating. This composite approach allows the ITO layer to maintain its electrical functionality while the cross-linked polymer provides mechanical protection, achieving a synergistic effect where neither material alone could provide both functionality and protection.
2Reliability
If ITO is used for the conductive layer, then transparency and conductivity are improved, but fragility increases and flexibility deteriorates
Solution Approach 1:
The patent introduces a cross-linked polymeric protective layer as an intermediary between the fragile ITO conductive layer and the external environment. This intermediary layer absorbs mechanical stresses and prevents direct contact between objects and the ITO layer, thereby protecting the ITO from damage while allowing the screen to remain flexible.
Solution Approach 2:
The patent uses a cross-linked polymeric thin film as a flexible protective shell that encapsulates the ITO layer. This thin film maintains the overall flexibility of the touch sensor while providing a protective barrier against scratches and mechanical damage, solving the contradiction between ITO's fragility and the need for flexibility.
3Adaptability or versatility
If polyester films are used as protective covers, then flexibility is improved, but scratch resistance deteriorates
Solution Approach 1:
The patent fundamentally changes the parameter of the protective layer by using cross-linked polymers instead of traditional linear polyester films. The cross-linking process creates a three-dimensional network structure that significantly increases the material's resistance to scratching while maintaining its flexibility, thereby resolving the contradiction between flexibility and scratch resistance.
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 cross-linked polymer structure significantly increases scratch resistance, allowing for flexible and durable touch screens that maintain transparency and functionality while reducing the reliance on fragile glass covers.
Implementation Method 1
a scratch resistant, protective coating applied to at least one of the first and second conductive layers, said coating comprising a cross-linked polymer structure
Data Source
AI summary
A method of manufacturing a scratch resistant, touch sensor comprising: (1) applying a non-polymer protective coating solution to a touch sensor; and (2) forming a cross-linked polymer structure by curing the protective coating solution.