Foldable Display Window Resin Layer for Buckling and Glass Separation
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Solution Overview
Problem
Existing foldable display devices face issues with impact resistance and separation of ultra-thin glass during folding operations, which compromise the reliability and durability of the display module.
Innovation Solution
A resin layer with specific Young's modulus and refractive index is applied on the window base, featuring grooves and distinct portions to enhance the folding characteristics and prevent separation, while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin layer is applied on the ultra-thin glass to improve impact resistance, then the strength and durability are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies a resin layer on the ultra-thin glass surface to create a composite structure. This composite material approach combines the high strength and hardness of the resin coating with the flexibility and thinness of the ultra-thin glass, achieving improved impact resistance while maintaining the overall thin profile of the display device.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the glass surface through resin coating, including surface hardness, friction coefficient, and optical properties. By controlling parameters such as resin thickness, crosslinking density, and surface energy, the patent achieves enhanced impact resistance without significantly increasing device complexity.
2Strength
If the resin layer is made thicker to improve impact resistance, then the strength is improved, but the device thickness increases
Solution Approach 1:
The patent employs a thin resin film coating on the ultra-thin glass surface rather than a thick bulk material. This thin film approach provides sufficient impact resistance through surface hardening and stress distribution mechanisms while maintaining the overall thinness of the display device, typically keeping the coating thickness in the range of micrometers rather than millimeters.
3Strength
If the resin layer is made harder to improve impact resistance, then the strength is improved, but the ease of operation and flexibility during folding deteriorate
Solution Approach 1:
The patent applies resin coating with locally optimized properties - the resin layer is designed to be harder at the surface for impact resistance while maintaining appropriate flexibility in the bulk to accommodate folding. The coating may have a gradient structure or layered composition that provides surface hardness without sacrificing overall flexibility, allowing the display to fold smoothly while resisting impacts.
4Manufacturing precision
If a groove is engraved in the folding portion to prevent buckling, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent incorporates grooves or recesses in the ultra-thin glass during the manufacturing process, before the resin coating is applied. These pre-formed structural features serve as alignment guides and buckling prevention elements that work in conjunction with the resin layer. The grooves are created using precision cutting or etching techniques during glass fabrication, integrating the alignment function into the base structure rather than adding separate components.
Data Source
AI summary
An electronic device includes: a display module; and a window on the display module. The window includes: a window base on the display module, and including: a folding portion having one surface of the window base partially engraved by a groove; and a first non-folding portion and a second non-folding portion spaced from each other with the folding portion between the first and second non-folding portions; and a resin layer on the one surface of the window base, and including: a first resin portion on the folding portion to fill the groove; and a second resin portion on the first non-folding portion and the second non-folding portion.