Display Cover Layer Crack Arresting Structures
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Solution Overview
Problem
Electronic devices with displays face challenges in integrating displays and other components due to space constraints and the risk of damage from excessive force, which can lead to crack propagation across the display cover layer.
Innovation Solution
The implementation of a display cover layer with an image transport layer and a protective layer, featuring locally modified properties such as reduced modulus of elasticity structures and materials like coherent fiber bundles or Anderson localization material, to arrest crack propagation and enhance strength through chemical strengthening, thermal tempering, and serpentine fiber configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective layer is added to enhance damage resistance, then the strength and crack propagation resistance improve, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The display cover layer is constructed as a composite structure combining an image transport layer (made of coherent fiber bundle or Anderson localization material) with a protective layer. This composite design provides both image transport functionality and enhanced damage resistance, resolving the contradiction between strength improvement and structural complexity by integrating multiple functions into a unified layered structure.
Solution Approach 2:
The protective layer is designed with locally modified properties, specifically with a first region having different characteristics than a second region. This local quality differentiation allows the structure to provide targeted protection where needed while maintaining overall simplicity, addressing the contradiction between enhanced strength and reduced complexity.
2Volume of moving object
If the display cover layer is made thinner to reduce space, then the area and volume are reduced, but the resistance to crack propagation and damage decreases
Solution Approach 1:
By using composite materials including coherent fiber bundles or Anderson localization material in the image transport layer combined with a protective layer, the system achieves high crack propagation resistance in a thin profile. The composite structure provides enhanced mechanical properties without increasing overall thickness, resolving the contradiction between reduced volume and maintained reliability.
Solution Approach 2:
The display cover layer utilizes thin film structures with specialized materials that provide exceptional strength and crack resistance relative to their thickness. The protective layer acts as a thin but effective barrier that prevents crack propagation while maintaining the overall thinness of the display assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively minimizes display borders, enhances the display's resistance to damage, and prevents crack propagation, ensuring the integrity of the image and the device's structural integrity during impact events.
Implementation Method 1
The image transport layer may be formed from a coherent fiber bundle layer
Implementation Method 2
the image transport layer may be chemically strengthened and/or thermally tempered
Implementation Method 3
the image transport layer may be chemically strengthened and/or thermally tempered
Implementation Method 4
The tips of fiber cores in the fibers in a coherent fiber bundle layer may be provided with concave recesses filled with hard material to help strengthen the surface of the coherent fiber bundle layer
Implementation Method 5
Fibers in a fiber bundle may also be provided with serpentine shapes to help enhance the resistance of the fiber bundle to damage from an impact
Data Source
AI summary
An electronic device may have a display that displays an image and a display cover layer that overlaps the display. The display cover layer may have an image transport layer with an input surface that receives the image and a corresponding output surface to which the image is transported. The image transport layer may be formed from a coherent fiber bundle layer or a layer of Anderson localization material. The display cover layer may have a protective layer such as a protective glass layer that overlaps the image transport layer. A ring-shaped region of the display cover layer may have one or more structures with locally modified properties for arresting crack propagation across the display cover layer. The ring-shaped region may have one or more structures with locally reduced elasticity values or other structures that help arrest cracks.