Rollable Display Guide Member for Boundary Stress Relief
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Solution Overview
Problem
Existing rollable display devices suffer from damage and stress-related issues due to repeated winding and unwinding, particularly at the boundary areas between flat and curved surfaces, leading to potential cracks and reduced durability.
Innovation Solution
A display device design incorporating a guide member supported by a roller to manage the display unit's curvature, distributing stress evenly and minimizing excessive bending, with an elastic member applying force to maintain a larger curvature radius and reduce stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display unit is wound on the roller, then the display device achieves rollability and reduced volume, but stress concentration and damage occur at the boundary area between flat and curved surfaces
Solution Approach 1:
A guide member is introduced as an intermediary component between the roller and the display unit. The guide member has a curved surface that matches the roller's curvature and provides a transition zone that distributes stress evenly, preventing stress concentration at the boundary area where the display unit transitions from flat to curved state during winding.
Solution Approach 2:
The curvature radius of the guide member's surface is specifically designed to be larger than the roller's curvature radius. This parameter change creates a gentler transition zone that reduces the bending stress on the display unit, allowing the display unit to be wound with a larger effective curvature radius and minimizing the risk of cracks.
2Adaptability or versatility
If the display unit is repeatedly wound and unwound, then the display device achieves flexibility and adaptability, but damage and cracks occur due to repeated stress
Solution Approach 1:
The guide member serves as a protective intermediary that remains in contact with the display unit during winding and unwinding operations. This intermediary structure absorbs and distributes the repeated mechanical stress, preventing direct stress concentration on the display unit and thereby improving durability while maintaining flexibility.
Solution Approach 2:
The guide member is positioned beforehand to provide a cushioning effect during winding operations. Its curved surface geometry is designed to preemptively reduce stress peaks before they can damage the display unit, creating a protective buffer zone that mitigates the harmful effects of repeated bending cycles.
3Shape
If the display unit is bent at the boundary area between flat and curved surfaces, then the display unit conforms to the roller shape, but excessive bending causes cracks
Solution Approach 1:
The guide member acts as a mediating surface between the roller and the display unit. Its curved surface is designed with a larger radius than the roller, creating a transition zone that allows the display unit to conform to a gentler curve. This intermediary geometry prevents excessive bending at the critical boundary area while still achieving the necessary shape conformity for proper winding.
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 design effectively minimizes damage and cracks in the display unit by evenly distributing stress, enhancing durability and reducing the risk of structural failure during winding and unwinding.
Implementation Method 1
an elastic member which is supported by the support unit to apply an elastic force to the guide member in a direction away from the roller
Data Source
AI summary
A display device includes a display unit. The display device further includes a roller in which the display unit is wound or unwound and a flat surface portion, a curved surface portion extending from the flat surface portion, and a support unit disposed between the flat surface portion and the curved surface portion are included. The display device further includes a guide member which is supported by the roller to support the display unit. The display device further includes an elastic member which is supported by the support unit to apply an elastic force to the guide member in a direction away from the roller to connect the roller and the guide member.