Thin Glass Composition for Foldable Display Impact Resistance
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Solution Overview
Problem
Existing glass articles for portable electronic devices, particularly those in foldable display devices, face challenges in balancing thinness for portability with the need to withstand external impacts and maintain mechanical strength, flexibility, and impact resistance.
Innovation Solution
A glass composition with a novel composition ratio of 62 to 72 mol% SiO2, 0 to 10 mol% Al2O3, 10 to 20 mol% Na2O, 0 to 5 mol% K2O, 7 to 18 mol% CaO and MgO, and optionally B2O3, which satisfies specific mole ratios and provides a thickness of 100 μm or less, enhancing mechanical strength, flexibility, and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the glass article is made thinner to improve portability, then the thickness is reduced, but the mechanical strength and impact resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the glass, specifically setting SiO2 content to 62-72 mol%, Al2O3 to 0-10 mol%, Na2O to 10-20 mol%, K2O to 0-5 mol%, and CaO+MgO to 7-18 mol%, while controlling the Al2O3/(Na2O+K2O) ratio between 0.1-0.6. These parameter changes enable the glass to achieve both thinness (100 μm or less) and sufficient mechanical strength by optimizing the molecular structure and bonding characteristics of the glass material.
2Adaptability or versatility
If the glass article is made thinner to improve flexibility for folding, then the thickness is reduced, but the impact resistance worsens
Solution Approach 1:
The patent creates a composite glass material system by combining multiple oxides in specific proportions: SiO2 as the base (62-72 mol%), Al2O3 for structural strength (0-10 mol%), Na2O for flexibility (10-20 mol%), K2O for additional柔韧性 (0-5 mol%), and CaO+MgO for durability (7-18 mol%). This composite composition achieves a balance between flexibility for folding applications and resistance to external impacts by leveraging the complementary properties of each component.
Data Source
AI summary
A glass composition, a glass article prepared therefrom, and a display device are provided. The a glass article includes, as a glass composition, 62 to 72 mol % of SiO2, greater than 0 and equal to or less than 10 mol % of Al2O3, 10 to 20 mol % of Na2O, greater than 0 and equal to or less than 5 mol % of K2O, 7 to 18 mol % of a sum of CaO and MgO with respect to a total weight of the glass article, satisfying Relation 1 below, and having a thickness of 100 μm or less: 0.1≤Al2O3/(sum of Na2O and K2O)≤0.6 . . . (Relation 1), where Al2O3, Na2O and K2O are contents of corresponding components measured in mole percents (mol %).