Thin-Glass Multilayer Structure for Crack Extension Resistance
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Solution Overview
Problem
Thin glass layers in multilayer structures are brittle and prone to crack extension, necessitating a configuration that prevents crack propagation even when minute cracks form.
Innovation Solution
A multilayer structure comprising a polarizing plate, a glass layer laminated with an adhesive layer, and an optical display bonded with a bonding layer, where the glass layer thickness is between 10 μm and 300 μm, and the bonding layer's thickness and elastic modulus satisfy the condition y≥(299/60)x−296/3, effectively preventing crack extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the glass layer thickness is reduced to achieve a thinner multilayer structure, then the overall structure becomes more compact, but the glass layer becomes more brittle and prone to crack formation and extension
Solution Approach 1:
The patent introduces a bonding layer as an intermediary between the glass layer and the optical display. This bonding layer has specific elastic modulus and thickness parameters that allow it to absorb stress and prevent crack propagation in the thin glass layer, thereby enabling the use of thinner glass without compromising reliability
Solution Approach 2:
The patent specifies precise parameter ranges for the bonding layer (thickness x and elastic modulus y satisfying y≥(299/60)x−296/3) to optimize its stress-absorbing capability. By carefully controlling these parameters, the bonding layer can effectively protect the thin glass layer from crack extension while maintaining the overall thinness of the structure
2Temperature
If the glass layer is made thin to improve display performance and reduce weight, then the display quality improves, but the glass layer becomes vulnerable to crack extension under thermal stress
Solution Approach 1:
The bonding layer serves as a stress buffer between the thin glass layer and the optical display, particularly under thermal conditions. Its specific elastic modulus allows it to accommodate thermal expansion differences and prevent stress concentration that would lead to crack extension in the thin glass layer
Solution Approach 2:
The bonding layer is designed in advance with specific mechanical properties to cushion and absorb potential thermal stresses before they can propagate cracks in the glass layer. This preventive cushioning effect is built into the structure through the specified bonding layer parameters
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 solution effectively prevents crack extension in the glass layer, ensuring the multilayer structure's integrity, particularly at elevated temperatures, by controlling the bonding layer's properties to manage thermal expansion and tensile forces.
Implementation Method 1
an elastic modulus y of the bonding layer at 85° C. satisfy y≥(299/60)x−296/3
Data Source
AI summary
A multilayer structure includes a polarizing plate; a glass layer laminated on one side of the polarizing plate via an adhesive layer; and an optical display laminated on another side of the polarizing plate via a bonding layer, wherein the glass layer has a thickness of 10 μm or more and 300 μm or less, and a thickness x of the bonding layer and an elastic modulus y of the bonding layer at 85° C. satisfy y≥(299/60)x−296/3.