Foldable Glass Composition for Thin, Crease-Resistant Cover Windows
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Solution Overview
Problem
Glass articles used in electronic devices, particularly in foldable displays, face challenges in balancing thinness with impact resistance and crease resistance during repeated folding operations.
Innovation Solution
A glass composition with specific ranges of SiO2, Al2O3, Na2O, Li2O, and MgO, along with defined R ratios, results in a glass article with improved impact resistance and reduced crease formation, featuring elastic modulus, brittleness, thermal expansion, and fracture toughness within specified ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If glass thickness is reduced for portability, then device weight and size are improved, but impact resistance deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass, specifically setting SiO2 content to 60-70 mol%, Al2O3 to 5-15 mol%, and controlling the ratio of Al2O3 to (Na2O+Li2O) between 0.3-1.0. These parameter changes enable thin glass (20-100 μm) to achieve both lightweight properties and high impact resistance through optimized material structure rather than increased thickness.
2Adaptability or versatility
If glass is folded for flexibility, then device adaptability is improved, but crease generation increases
Solution Approach 1:
The patent creates a composite glass system combining multiple oxides (SiO2, Al2O3, Na2O, Li2O, MgO) in specific proportions. This composite composition, with Al2O3 content of 5-15 mol% and controlled ratios relative to alkali oxides, produces a glass structure that maintains flexibility for folding while resisting permanent deformation and crease formation through enhanced structural integrity.
3Strength
If glass strength is increased for impact resistance, then durability is improved, but flexibility deteriorates
Solution Approach 1:
The patent optimizes compositional parameters to achieve a balance point: SiO2 at 60-70 mol% provides structural strength, while Al2O3 at 5-15 mol% and the controlled ratio Al2O3/(Na2O+Li2O) of 0.3-1.0 maintain flexibility. This parameter optimization allows the glass to exhibit both high impact resistance and sufficient flexibility for foldable applications simultaneously.
Data Source
AI summary
A glass article includes a glass composition including SiO2 in a range of about 60 mol % to about 70 mol %, Al2O3 in a range of about 5 mol % to about 15 mol %, Na2O in a range of about 5 mol % to about 15 mol %, Li2O in a range of about 5 mol % to about 15 mol %, and MgO greater than 0 mol % and less than or equal to about 5 mol % with respect to a total weight of the glass composition, the glass composition satisfies Relation 1 (0.3≤Al2O3/(a sum of Na2O and Li2O)≤1.0, wherein Al2O3, Na2O and Li2O represent contents of respective components in mol %), and a thickness of the glass article is in a range of about 20 μm to about 100 μm.