Thin Glass Composition for Foldable Display Cover Windows
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Solution Overview
Problem
Existing glass compositions for portable electronic devices, particularly foldable display devices, face challenges in balancing thinness for portability with the need to withstand external impacts and maintain flexibility while ensuring mechanical strength and impact resistance.
Innovation Solution
A glass composition with a novel composition ratio of 60-70 mol% SiO2, 5-15 mol% Al2O3, 5-15 mol% Na2O, 0-5 mol% K2O, 0-5 mol% Li2O, and 0-5 mol% MgO, optimized to achieve a specific thermal expansion coefficient, elastic modulus, and surface roughness, which is processed to create a thin, flexible, and strong glass article suitable for foldable display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the glass thickness is reduced to improve portability and relieve bending stress, then the flexibility and portability are improved, but the mechanical strength and impact resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the glass by precisely controlling the mole percentages of SiO2 (60-70%), Al2O3 (5-15%), Na2O (5-15%), and other oxides. This composition optimization enables the glass to achieve high strength and flexibility simultaneously at thin thicknesses of 50μm or less
Solution Approach 2:
The patent creates a composite glass material system combining multiple oxide components in specific ratios. The synergistic effect of SiO2 network structure, Al2O3 reinforcement, and Na2O/Li2O modifiers produces a composite material with enhanced mechanical properties that overcomes the limitations of single-component glass at thin thickness
2Adaptability or versatility
If the glass thickness is reduced to improve flexibility for foldable devices, then the adaptability to folding is improved, but the reliability and durability under external impacts deteriorate
Solution Approach 1:
The patent optimizes physical parameters including thermal expansion coefficient (85-95×10^-7/K), glass transition temperature (400-500°C), and elastic modulus by adjusting chemical composition. These parameter changes enable the glass to maintain high reliability under impact while achieving the flexibility needed for foldable applications
Solution Approach 2:
The patent introduces Al2O3 (5-15%) as a local reinforcement component within the glass matrix. This creates local regions of enhanced strength and rigidity that improve impact resistance and durability without compromising the overall flexibility required for folding
3Strength
If the composition ratio is optimized to improve mechanical strength, then the strength and impact resistance are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific ranges for each oxide component (SiO2: 60-70%, Al2O3: 5-15%, Na2O: 5-15%, etc.) that balance strength requirements with manufacturing feasibility. These parameter ranges provide clear manufacturing targets that achieve high strength while maintaining reasonable precision control in production
Data Source
AI summary
A glass article includes a glass composition including mole percent (mol %) to 70 mol % of SiO2, 5 mol % to 15 mol % of Al2O3, 5 mol % to 15 mol % of Na2O, greater than 0 mol % and equal to or less than 5 mol % of K2O, 5 mol % to 15 mol % of Li2O, and greater than 0 mol % and equal to or less than 5 mol % of MgO, and satisfying Relation (1) below:0.1≤Al2O3/(sum of Na2O,K2O, and Li2O)≤0.7 (1),where Al2O3, Na2O, K2O, and Li2O in the Relation (1) denote contents (mol %) of Al2O3, Na2O, K2O, and Li2O, respectively, in the glass composition, and the glass article has a thickness of 100 micrometers (μm) or less.