Thin Glass-Resin Cover Structure for Foldable Display Durability
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Solution Overview
Problem
Conventional display device cover members, whether made of glass or resin, face challenges in balancing impact resistance, scratch resistance, and flexibility, especially in flexible displays like foldable devices, where glass is prone to cracking and resin layers may compromise surface hardness.
Innovation Solution
A member for a display device comprising a thin glass substrate (100 μm or less) with a resin layer on one surface, where the resin layer has a composite elastic modulus of 5.7 GPa or more and a thickness of 5 μm to 60 μm, optionally with a primer or functional layer, enhancing impact and scratch resistance while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If glass is thinned to improve flexibility, then flexibility is improved, but impact resistance is drastically deteriorated and glass is more likely to be cracked
Solution Approach 1:
The invention uses a composite structure consisting of a thin glass substrate (100 μm or less) combined with a resin layer (5-60 μm thick with composite elastic modulus of 5.7 GPa or more). This composite structure allows the glass to be thin and flexible while the resin layer provides impact resistance and prevents cracking, resolving the contradiction between flexibility and strength.
2Strength
If glass is used to improve scratch resistance and optical transparency, then scratch resistance and optical transparency are improved, but flexibility is deteriorated and glass is prone to cracking when folded
Solution Approach 1:
The composite structure combines hard glass (providing scratch resistance and optical transparency) with a flexible resin layer (providing flexibility and bendability). The resin layer acts as a buffer that allows the rigid glass to be folded without cracking, resolving the contradiction between scratch resistance and flexibility.
Solution Approach 2:
The invention uses a thin glass substrate (100 μm or less) that can be bent, combined with a resin film that provides the necessary flexibility. This allows the rigid glass to be made flexible through thinning and combination with a flexible resin layer, enabling foldable display applications.
3Adaptability or versatility
If resin cover member is used to improve flexibility and chip-proof properties, then flexibility and chip-proof properties are improved, but surface hardness is reduced making it prone to scratching
Solution Approach 1:
The invention creates a composite structure where the resin layer (thick enough to provide flexibility and chip-proof properties) is combined with a glass substrate (hard enough to provide scratch resistance). This resolves the contradiction by allowing the resin to provide flexibility while the glass provides surface hardness.
Data Source
AI summary
The present disclosure provides a member for a display device comprising: a glass substrate with a thickness of 100 μm or less; and a resin layer placed on one surface side of the glass substrate, a composite elastic modulus of the resin layer is 5.7 GPa or more, and a thickness of the resin layer is 5 μm or more and 60 μm or less.