Foldable Display Hinge Layout for Lower Panel Bending Stress
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Solution Overview
Problem
Flexible display devices face challenges in reducing bending stress during folding, which can lead to damage and reliability issues with the display panel.
Innovation Solution
A display device design featuring a hinge system with a first and second joint, and rotators connecting these joints, where the second rotator is closer to the display panel than the first rotator, distributing bending stress more evenly and reducing tension on the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made foldable to improve portability and convenience, then flexibility and portability are improved, but bending stress is applied to the display panel causing damage and reliability issues
Solution Approach 1:
The hinge is divided into multiple segments including a first joint, second joint, first rotator, and second rotator. This segmentation allows the bending stress to be distributed across multiple rotation points rather than concentrated at a single location, thereby protecting the display panel while maintaining foldability.
Solution Approach 2:
The hinge structure acts as an intermediary mechanism between the folding and non-folding regions. By introducing the first and second rotators as intermediate components, the display panel is isolated from direct bending stress, as the rotation occurs at the hinge joints rather than at the panel itself.
2Device complexity
If a simple hinge structure is used to reduce device complexity, then manufacturing and assembly are simplified, but bending stress concentration occurs causing display panel damage
Solution Approach 1:
The hinge is divided into multiple segments including a first joint, second joint, first rotator, and second rotator. This segmentation allows the bending stress to be distributed across multiple rotation points rather than concentrated at a single location, thereby protecting the display panel while maintaining foldability.
3Device complexity
If the first rotator is positioned closer to the display panel to simplify the hinge design, then device complexity is reduced, but bending stress concentration occurs at the display panel
Solution Approach 1:
The hinge structure employs asymmetric positioning of the rotators, with the second rotator positioned closer to the display panel than the first rotator. This asymmetric arrangement optimizes the stress distribution pattern, creating a more favorable mechanical configuration that reduces peak bending stress on the display panel compared to a symmetric design.
Solution Approach 2:
The patent positions the rotation axes of the first and second rotators at different distances from the display panel, creating a multi-dimensional stress distribution. The second rotator's axis is closer to the panel while the first rotator's axis is farther away, establishing a gradient in the stress field that reduces concentration at any single point.
Data Source
AI summary
A display device includes: a folding region and a non-folding region; a display module corresponding to the folding region and the non-folding region; a module supporter corresponding to the non-folding region and in which the display module is received; and a hinge corresponding to the folding region and rotatably connected to the module supporter. The hinge includes: a first joint and a second joint, a first rotator which rotatably connects the module supporter to the first joint, and a second rotator which rotatably connects the first joint to the second joint. The display module includes a first plane facing the module supporter, and a distance between the second rotator and the first plane is greater than a distance between the first rotator and the first plane.