Flexible Glass Cover for Foldable Displays
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Solution Overview
Problem
Existing glass articles used in portable electronic devices and foldable display devices face challenges in balancing thinness for flexibility and strength to withstand external impacts.
Innovation Solution
A glass article with specific physical properties, including a fracture energy index, elastic energy indices, and free volume indices, is developed to enhance impact resistance. The glass article has a thickness ranging from 20 μm to 150 μm and is composed of SiO2, Al2O3, and at least one metal oxide, with optimized flux ratios and Al2O3 content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the glass article is made thinner to improve flexibility for foldable devices, then the flexibility and portability are improved, but the impact resistance and strength deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition ratios of glass components (SiO2, Al2O3, metal oxides, fluxes) and controlling manufacturing parameters (heating temperature, cooling rate) to achieve a thin glass structure with enhanced mechanical properties that maintains both flexibility and impact resistance
Solution Approach 2:
The patent creates a composite glass material system combining multiple oxides (SiO2, Al2O3, metal oxides, fluxes) in specific ratios to produce a thin glass article that exhibits both flexibility for folding applications and improved impact resistance through the synergistic effects of the composite composition
2Weight of moving object
If the glass article is made thinner to reduce weight and improve portability, then the weight and thickness are reduced, but the durability and impact resistance worsen
Solution Approach 1:
The patent changes the physical and chemical parameters of the glass material, including composition ratios and manufacturing conditions, to produce a thin glass article with enhanced durability that maintains low weight while achieving improved impact resistance through optimized material properties
Data Source
AI summary
A glass article used as a cover glass of a flexible display device has values of indices consistent with results of a pen drop test and excellent impact resistance characteristics.