Ion-Strengthened Rigid Substrate for Crack-Resistant Touch Panels
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Solution Overview
Problem
Strengthened substrates used in electronic devices often develop cracks during cutting and forming processes, leading to stress concentration areas that limit their mechanical strength and durability.
Innovation Solution
A rigid substrate with an etched wall and an ion-strengthened surface layer is developed, where the average depth of the ion-strengthened surface layer is uniform across both the etched and unetched areas, reducing stress concentration and enhancing mechanical strength through a combination of etching and ion strengthening processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strengthened substrate is used to enhance mechanical strength, then the durability of the panel device is improved, but cracks are produced at cut-off edges during cutting and forming processes, creating stress concentration areas that limit the mechanical strength
Solution Approach 1:
The patent applies preliminary action by performing ion exchange strengthening before the cutting and forming processes. This pre-treatment creates a compressive stress layer on the substrate surface that prevents crack initiation and propagation during subsequent mechanical processing, thereby maintaining both high mechanical strength and durability without stress concentration issues
Solution Approach 2:
The ion exchange process creates a compressive stress cushion layer on the substrate surface before cutting operations. This compressive stress layer acts as a protective cushion that counteracts the tensile stresses generated during cutting and forming, preventing crack formation and ensuring the substrate maintains its mechanical strength and durability throughout the manufacturing process
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 method effectively enhances the mechanical strength of the substrate, reducing the likelihood of crack growth and improving the durability and quality of touch panels by distributing compressive stress uniformly, thus providing a stable and robust product.
Implementation Method 1
an ion strengthening process is performed to the rigid substrate parison so that an ion strengthened surface layer is formed
Data Source
AI summary
A rigid substrate, a touch panel including the rigid substrate and a processing method of the rigid substrate are provided. The rigid substrate includes an ion strengthened surface layer completely covering the entire outer surface thereof. The rigid substrate has an etched wall, wherein an average depth of the ion strengthened surface layer on the etched wall is substantially equivalent to an average depth of the ion strengthened surface layer outside of the etched wall.