Laminate with Joining Layer for Thin Glass Impact Resistance
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Solution Overview
Problem
Thin glass substrates used in display devices are prone to cracking when impacted, compromising both the device's functionality and user safety due to their low impact resistance and bending resistance.
Innovation Solution
A stacked body comprising a glass substrate, a joining layer, and a hard coating film, where the hard coating film includes a substrate layer and a hard coating layer, with a specific thickness ratio and elastic modulus configuration to enhance bending and impact resistance, while maintaining scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass substrate thickness is reduced to achieve flexibility and bending resistance, then bending resistance is improved, but impact resistance deteriorates drastically
Solution Approach 1:
The patent applies composite materials by stacking multiple layers including glass substrate, resin layers, and adhesive layers to create a laminated structure. This composite construction allows the thin glass (10-100 μm) to maintain flexibility while the combined structure provides enhanced impact resistance, resolving the contradiction between thinness for flexibility and thickness for impact resistance.
Solution Approach 2:
The patent implements beforehand cushioning by incorporating resin layers and adhesive layers between the glass substrates. These intermediate layers act as cushioning elements that absorb impact energy before it reaches the glass, preventing crack propagation while maintaining the thin glass structure necessary for flexibility and bending resistance.
2Adaptability or versatility
If glass substrate thickness is reduced to enable folding, then adaptability for flexible displays is improved, but reliability deteriorates due to easy cracking
Solution Approach 1:
The patent uses composite materials in the form of a laminated structure with glass substrates, resin layers, and adhesive layers. This composite construction enables the glass to be thin enough for folding (10-100 μm) while the combined structure maintains reliability by distributing stress and preventing crack propagation through the intermediate cushioning layers.
Solution Approach 2:
The resin layers and adhesive layers serve as beforehand cushioning elements that are built into the structure before use. These layers prevent crack propagation in the thin glass during folding operations, maintaining reliability while enabling the flexibility needed for foldable displays.
3Strength
If glass is chemically strengthened to improve bending resistance, then bending resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the protective structure into separate layers: glass substrates, resin layers, and adhesive layers. This allows the bending resistance function to be distributed across multiple components rather than requiring complex chemical strengthening of the glass itself, simplifying the manufacturing process while maintaining structural integrity.
Solution Approach 2:
The patent uses composite materials to achieve bending resistance through the laminated structure rather than chemical strengthening. The combination of thin glass substrates with resin and adhesive layers provides the necessary mechanical strength through structural design rather than material treatment, reducing manufacturing complexity.
Data Source
AI summary
The present disclosure provides a stacked body comprising: a glass substrate; a joining layer; and a hard coating film, in this order, wherein the hard coating film includes a substrate layer and a hard coating layer, from a joining layer side; the joining layer is a layer configured to join the glass substrate and the substrate layer; a thickness of the glass substrate is 10 μm or more and 100 μm or less; and when a thickness of the hard coating layer is regarded as A, a thickness of the substrate layer is regarded as B, and a thickness of the joining layer is regarded as C, a ratio of (A+B) with respect to C is 3.0 or more and 500 or less.