Foldable Ceramic Cover Structure for Low-Stress Flexible Displays
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Solution Overview
Problem
Traditional electronic devices with rigid displays are limited by mechanical hinges, which restrict their ability to accommodate multiple form factors and are prone to internal stress when folded.
Innovation Solution
The use of flexible cover sheets made from ceramic materials, such as glass or sapphire, coupled with a flexible display layer, allowing for localized bending without excessive internal stress, and incorporating relief features and variable thickness to facilitate folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical hinge is used to enable multiple form factors, then adaptability is improved, but device complexity and internal stress increase
Solution Approach 1:
The patent removes the separate mechanical hinge component entirely and integrates the folding function directly into the display layer through its flexible substrate construction. This extraction of the hinge mechanism eliminates the associated complexity while preserving the multiple form factor capability through the flexible display's inherent bendability.
Solution Approach 2:
The patent combines the hinge function with the display layer itself by making the display substrate flexible and capable of bending. This merging eliminates the need for a separate mechanical hinge component, reducing device complexity while maintaining adaptability for multiple form factors through the integrated flexible structure.
2Strength
If a rigid ceramic cover is used, then impact resistance is improved, but folding capability deteriorates due to excessive internal stress
Solution Approach 1:
The patent applies different properties to different regions of the cover: the outer surface maintains full ceramic thickness for impact resistance, while relief features create locally thinned regions at the fold line that reduce internal stress and enable folding. This local differentiation allows the cover to simultaneously achieve both strength and flexibility.
Solution Approach 2:
The patent creates a flexible folding region by incorporating relief features that locally thin the ceramic cover, allowing it to bend without excessive stress. The thinned regions act as flexible zones that enable the rigid ceramic material to accommodate folding while maintaining overall structural integrity and impact resistance in non-folded areas.
3Strength
If the ceramic layer thickness is increased, then impact resistance is improved, but folding stress increases
Solution Approach 1:
The patent maintains full ceramic thickness in most areas for impact resistance while creating locally thinned regions through relief features at the fold line. This local differentiation allows the cover to have both high overall strength and reduced folding stress in the specific region where bending occurs.
Solution Approach 2:
The patent segments the ceramic cover thickness at the fold line by creating relief features that remove material locally. This segmentation of the ceramic layer into full-thickness and thinned regions allows the structure to withstand impact forces while reducing internal stress during folding operations.
Data Source
AI summary
Electronic devices including a display layer and a cover layer including a foldable region are disclosed herein. The display layer and the cover layer are configured to be moved between a folded configuration and an unfolded configuration by bending the cover layer along the foldable region. Methods of making a cover layer for an electronic device are also disclosed.