Thin Glass Composition for Foldable Display Strength
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Solution Overview
Problem
Conventional glass articles used in portable electronic devices, such as smartphones and foldable display devices, face challenges in balancing strength with thinness and flexibility to withstand external shocks while maintaining mechanical integrity and portability.
Innovation Solution
A glass composition with a specific ratio of SiO2, Al2O3, Na2O, Li2O, MgO, and ZrO2, along with optional P2O5, is developed, which satisfies a particular relational expression for Al2O3, Na2O, and Li2O content, resulting in a glass article with enhanced mechanical strength, surface strength, and shock resistance, suitable for use as a cover window in foldable display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the glass article is reduced to improve portability and relieve bending stress, then the glass article becomes more suitable for foldable display devices, but the mechanical strength and shock resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the glass, specifically setting SiO2 content to 60-70 mol%, Al2O3 to 5-15 mol%, and controlling the ratio Al2O3/(Na2O + Li2O) to be 0.3-1.0. This compositional parameter optimization enables thin glass (20-100 μm) to achieve both flexibility and adequate mechanical strength for foldable display devices.
2Adaptability or versatility
If the thickness of the glass article is reduced to relieve bending stress, then the glass article becomes more flexible for foldable devices, but the shock resistance and mechanical integrity worsen
Solution Approach 1:
The patent creates a composite glass material system combining multiple oxides (SiO2, Al2O3, Na2O, Li2O, MgO, ZrO2) in specific proportions. This composite composition provides both the flexibility needed for folding applications and the shock resistance required for reliable operation, resolving the contradiction between adaptability and reliability.
3Strength
If the glass composition is optimized for strength and shock resistance, then the mechanical properties improve, but the processability and flexibility may deteriorate
Solution Approach 1:
The patent optimizes compositional parameters including SiO2 (60-70 mol%), Al2O3 (5-15 mol%), and the critical ratio Al2O3/(Na2O + Li2O) = 0.3-1.0. This parameter optimization achieves a balance where the glass maintains high mechanical strength while preserving good processability for manufacturing and flexibility for foldable applications.
Data Source
AI summary
A glass article having a glass composition including about 60 mol% to about 70 mol% of SiO2, about 5 mol% to about 15 mol% of Al2O3, about 5 mol% to about 15 mol% of Na2O, about 5 mol% to about 15 mol% of Li2O, about 0 mol% to about 5 mol% of MgO, and about 0 mol% to about 5 mol% of ZrO2 based on a total weight of the glass composition, where a thickness of the glass article is in a range of about 20 µm to about 100 µm, and the glass composition satisfies the following Relational Expression: 0.3 < A12O3/(Na2O + Li2O) ≤ 1, in which Al2O3, Na2O, and Li2O denote contents (mol%) of respective components in the glass composition.