Flexible Display Cavity Design for Clamshell Folding Stress
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Solution Overview
Problem
Conventional clamshell devices with a single display face mechanical stress issues when folded, leading to potential delamination and failure due to a small radius of curvature, limiting their practicality and functionality.
Innovation Solution
Implementing a flexible display that avoids being folded flat by using a hinge assembly and forming a cavity within the device, allowing the display to escape into this cavity when folded, thereby reducing mechanical stress, and optionally using guiding devices like rollers or tensioners to ensure the display is properly positioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single display is implemented in a clamshell device, then the device footprint is reduced and integration is improved, but mechanical stress increases leading to delamination and failure
Solution Approach 1:
The display is allowed to move out of the planar dimension into the third dimension by forming a cavity within the device body. When the clamshell device is folded, the display can escape into this cavity space, transforming the problem from a 2D stress concentration issue to a 3D spatial accommodation solution. This dimensional transition eliminates the small radius of curvature that causes delamination while maintaining the integrated single-display design.
2Volume of moving object
If the display is folded flat between panels, then the device can be compactly closed, but the radius of curvature becomes too small causing mechanical stress and potential failure
Solution Approach 1:
A cavity is pre-formed within the device body before the folding operation. This cavity acts as a cushioning space that the display can escape into during folding, preventing the display from being forced into a high-stress small radius configuration. The cavity is prepared in advance to accommodate the display's natural curvature requirements while still enabling compact device closure.
Solution Approach 2:
The display is nested within a cavity formed inside the device body structure. When the device is folded, the display can be positioned within this internal cavity space rather than being compressed between the external panels. This nesting arrangement allows the display to maintain its structural integrity while the device achieves compact closure.
3Ease of operation
If guiding devices like rollers or tensioners are added, then display positioning is improved, but device complexity increases
Solution Approach 1:
Rollers or tensioners are introduced as intermediary components that facilitate the display's movement into and positioning within the cavity during the folding operation. These intermediaries mediate between the display and the cavity space, ensuring proper positioning without requiring complex mechanical guidance systems. The intermediaries simplify the overall positioning mechanism by providing straightforward rolling or tensioning actions.
Data Source
AI summary
In general, in one aspect, the disclosure describes an apparatus that includes two panels pivotally connected together. The panels can pivot from an open arrangement where the two panels lay side by side to a closed arrangement where the two panels lay one on top of another. The apparatus also includes a flexible display connected to the two panels and having a portion that is mechanically free from the two panels. The apparatus further includes a cavity to receive at least a portion of the free portion of the display when the panels are pivoted into the closed arrangement.