Chemically Strengthened Thin Glass Touch Panel Integration
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Solution Overview
Problem
The challenge is to develop improved techniques for fabricating thin sheet glass touch panels that are stronger, less susceptible to damage, and can be securely integrated into portable electronic devices, while also efficiently coupling external circuitry.
Innovation Solution
The solution involves chemically strengthening thin glass sheets to less than half a millimeter thickness, patterning thin films for touch sensors, and using laser scribing to singulate panels, along with a flex circuit for secure electrical coupling and selective adhesive application to minimize size and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If glass thickness is reduced to make devices thinner, then device thickness is reduced, but glass strength and damage resistance deteriorate
Solution Approach 1:
The patent applies chemical strengthening by immersing thin glass in a molten salt bath (e.g., KNO3 at 450°C) to exchange sodium ions with potassium ions, creating compressive stress in the glass surface. This parameter change in chemical composition and stress state significantly enhances the strength of thin glass substrates below 0.5mm thickness, resolving the contradiction between reduced thickness and maintained strength.
2Length of moving object
If glass thickness is reduced to make devices thinner, then device thickness is reduced, but susceptibility to damage during fabrication increases
Solution Approach 1:
Chemical strengthening through ion exchange transforms the physical-chemical parameters of thin glass, creating a compressed surface layer that is highly resistant to mechanical stress and damage. This pre-strengthening before fabrication processes significantly reduces susceptibility to damage during handling, cutting, and assembly operations.
3Device complexity
If traditional assembly methods are used with thin glass, then assembly is simpler, but secure holding of the touch panel is compromised
Solution Approach 1:
The patent introduces a specifically formulated adhesive layer as an intermediary between the chemically strengthened thin glass and the device housing. This adhesive mediator compensates for the reduced mechanical interlocking capability of thin glass, providing secure holding and structural support while maintaining the simplicity of the overall assembly 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
This approach results in thinner, more durable touch panels that can be securely integrated into portable devices, maintaining optical transparency and enabling efficient coupling of external circuitry, thus addressing the need for thinner, more robust touch panels in portable electronics.
Implementation Method 1
chemically strengthened glass substrate
Implementation Method 2
laser scribing the thin mother glass sheet
Data Source
AI summary
Improved techniques are disclosed for fabrication of touch panels using thin sheet glass, coupling external circuitry, and securely holding the touch panel within a portable electronic device. The thin sheet glass may be chemically strengthened and laser scribed.