Flexible Shaft Back Plate for Foldable Displays
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Solution Overview
Problem
Flexible display devices face challenges in rapid folding and long service life due to stress concentration and bulge deformation when bent or folded, making it difficult to meet requirements for foldable times and durability.
Innovation Solution
A back plate structure featuring a flexible shaft with an arch component and end components having foldable structures, such as V-shaped or herringbone units, which allows for rapid folding while minimizing uplift deformation and improving durability by distributing stress effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional shaft structure is used for folding, then the device can be folded, but stress concentration occurs and bulge deformation happens during folding
Solution Approach 1:
The shaft structure is divided into multiple segments including a first shaft body, a second shaft body, and a connection component. This segmentation allows each part to independently handle stress during folding, preventing stress concentration in a single location and avoiding bulge deformation.
Solution Approach 2:
The connection component enables relative movement between the first and second shaft bodies during folding. This dynamic adjustment allows the structure to adapt to folding stresses, distributing forces evenly and preventing stress concentration while maintaining structural integrity.
2Speed
If rapid folding is required, then folding speed increases, but stress concentration and bulge deformation worsen
Solution Approach 1:
The dynamic connection component allows the shaft bodies to move relative to each other during rapid folding, distributing impact forces over time and preventing stress concentration that would occur in rigid structures, thereby enabling fast folding without compromising service life.
Solution Approach 2:
The structure changes its mechanical parameters during folding - the connection component transitions from a rigid state during normal operation to a flexible state during folding, allowing rapid movement while controlling stress distribution to prevent deformation and maintain reliability.
3Stability of the object's composition
If the shaft structure is made more rigid to prevent deformation, then structural stability improves, but folding speed decreases
Solution Approach 1:
The connection component provides dynamic flexibility during folding while maintaining structural stability during normal operation. This allows the structure to be rigid when needed for stability but flexible when folding is required, eliminating the trade-off between stability and folding speed.
Solution Approach 2:
By segmenting the shaft into movable parts connected by the connection component, the structure maintains overall stability while allowing localized movement during folding. This enables rapid folding without compromising the structural integrity of the entire assembly.
Data Source
AI summary
The present application provides a back plate structure and a flexible display device. The back plate structure includes: a first back plate, a second back plate and a flexible shaft. The first back plate and the second back plate are connected by the flexible shaft. The flexible shaft includes an arch component and at least one end component. The arch component includes a concave surface and a convex surface corresponding to the concave surface, and the concave surface faces a bending direction of the flexible display device. Each end component includes at least one foldable structure, and each foldable structure includes two planes parallel to a bending axis of the flexible display device. Each end component is located at an end of the arch component and obscures a space formed by the arch component.