Rotating Shaft Assembly for Foldable Flexible Screen Support
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Solution Overview
Problem
Foldable display devices face issues with tensile forces on flexible screens due to mismatched rotation radii and fixed gaps between support plates, leading to incomplete contact and non-flat screens over time.
Innovation Solution
A support device with adjustable rotating shaft assemblies and sliding grooves allows for lateral movement of support plates, enabling adjustment of rotation radii and gaps to reduce tensile forces and ensure complete contact and flatness of the flexible screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the support plates rotate about a fixed rotating shaft, then the foldable display device can achieve folded and unfolded states, but the flexible screen is subjected to tensile force due to mismatched rotation radii
Solution Approach 1:
The rotating shaft is made movable along the sliding groove instead of being fixed, allowing the rotation radius to dynamically adjust during the folding process. This dynamic adjustment ensures the rotation radius matches the flexible screen's bending radius, eliminating tensile force while maintaining folding functionality
Solution Approach 2:
The rotation radius parameter is changed from fixed to variable through the sliding groove mechanism. As the support plates fold, the rotating shaft slides along the groove to continuously adjust the rotation radius, matching it to the flexible screen's requirements and preventing tensile force
2Volume of moving object
If the gap between support plates is fixed and excessively small, then the structure is compact, but the flexible screen is subjected to large tensile force in folded state
Solution Approach 1:
The gap between support plates is transformed from a fixed dimension to a dynamic parameter that adjusts during folding. The sliding groove enables the rotating shaft to move, automatically optimizing the gap and rotation radius to match the flexible screen's folding requirements, eliminating tensile force while maintaining compactness
3Reliability
If the gap between support plates is fixed and excessively large, then the flexible screen can contact the support plates completely in folded state, but the screen becomes non-flat in unfolded state
Solution Approach 1:
The gap and rotation radius are made dynamic through the sliding groove mechanism. During folding, the shaft slides to increase the gap for complete contact; during unfolding, it slides back to reduce the gap and maintain screen flatness. This dynamic adjustment resolves the contradiction between contact completeness and flatness
4Device complexity
If the rotation radius is fixed, then the support structure is simple, but it cannot adapt to different folding states causing tensile force on the flexible screen
Solution Approach 1:
The fixed rotating shaft is replaced with a movable shaft constrained by a sliding groove. This creates a dynamic support structure that automatically adapts to different folding states by adjusting the rotation radius, while the groove provides geometric constraints that maintain structural simplicity and reliability
Data Source
AI summary
A support device for a foldable flexible screen and a display device using the same. The support device includes a first support plate and a second support plate, configured to support and fix a flexible screen; and at least one rotating shaft assembly, configured to connect the first support plate and the second support plate such that the first support plate and the second support plate are able to rotate relative to each other. One of the first support plate and the second support plate is provided with a sliding groove, and one side of the rotating shaft assembly is provided with a rotating shaft; the rotating shaft is slidable and rotatable within the sliding groove; and an extension direction of the sliding groove is not perpendicular to a lengthwise direction of the support plate where the sliding groove is provided.