Foldable Glass Cover Hinge for Bending Without Display Distortion
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Solution Overview
Problem
Traditional electronic device covers lack sufficient damage resistance and flexibility, especially when transitioning between unfolded and folded configurations, leading to potential damage and distortion of graphical output.
Innovation Solution
A foldable cover with a hinge structure formed from a glass material, featuring varying thickness and stress patterns across different portions to balance bending, damage resistance, and minimize distortion, combined with a coating for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover member is made thicker to provide rigidity and damage resistance, then strength is improved, but the ability to bend flexibly is worsened
Solution Approach 1:
The cover member implements varying thickness across different regions: the hinge portion has reduced thickness (e.g., 20-50 micrometers) to enable flexible bending, while the window portions maintain greater thickness (e.g., 60-200 micrometers) for damage resistance. This local quality variation allows the cover to simultaneously achieve flexibility where needed and strength where required.
Solution Approach 2:
The cover member is segmented into functionally distinct portions: a hinge portion with reduced thickness for bending, and window portions with greater thickness for protection. This segmentation allows each portion to be optimized for its specific function, resolving the contradiction between overall flexibility and overall strength.
2Strength
If ion exchange strengthening is applied to the cover member to provide damage resistance, then strength is improved, but distortion of graphical output is worsened
Solution Approach 1:
Ion exchange strengthening is applied selectively and differentially across the cover member. The hinge portion receives limited or no ion exchange to preserve its flexibility and prevent distortion, while the window portions receive ion exchange treatment to enhance damage resistance. This local differentiation of strengthening treatment resolves the contradiction between overall strength and graphical fidelity.
Solution Approach 2:
The ion exchange strengthening process is segmented by spatial location and functional requirement. Different portions of the cover member receive different degrees of ion exchange treatment based on their functional needs, allowing the window portions to be strengthened while the hinge portion maintains its optical accuracy.
3Adaptability or versatility
If the hinge portion thickness is reduced to facilitate bending, then flexibility is improved, but damage resistance is worsened
Solution Approach 1:
The cover member is segmented into a hinge portion with reduced thickness for flexibility and window portions with greater thickness for damage resistance. This segmentation allows the hinge to bend easily while the window portions provide structural protection, resolving the contradiction between bending capability and damage resistance.
Solution Approach 2:
The hinge portion is designed with locally reduced thickness (e.g., 20-50 micrometers) compared to the window portions (e.g., 60-200 micrometers). This local quality variation enables the hinge to flex without compromising the overall structural integrity or the damage resistance of the cover member.
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
The solution provides a foldable cover that maintains structural integrity and minimizes graphical distortion while allowing for a small bend radius, offering enhanced damage resistance and flexibility.
Implementation Method 1
The hinge may be strengthened at least in part through ion exchange. The strengthening of the cover member may provide a balance between facilitating bending of the cover member, providing damage resistance to the cover member, and, in some cases, minimizing distortion of graphical output from the display assembly.
Data Source
AI summary
A strengthened foldable cover may include a cover member formed from a glass material. A hinge of the cover member defines a bend in the folded configuration of the foldable cover. One or more portions of the cover member that define the hinge may be strengthened differently than other portions of the cover member in order to facilitate bending of the cover member while providing damage resistance and minimizing distortion of graphical output from the display assembly.