Rolling Hinge for Flexible Displays in Mobile Terminals
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Solution Overview
Problem
Flexible displays in mobile terminals face issues with durability due to stress concentration at specific points, leading to potential damage and waviness, especially when using adhesives for support structures.
Innovation Solution
A mobile terminal design featuring a rolling hinge with deformable sheets and rivets instead of adhesives to distribute stress evenly, preventing concentration and transferring of support bars to the variable display portion, ensuring a flat and flexible display without waviness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used to attach support structures to the flexible display, then the support structure can be securely attached, but stress concentrates at specific points causing durability issues and potential damage
Solution Approach 1:
The support structure is divided into multiple discrete support bars rather than using a continuous adhesive attachment. Each support bar is independently positioned and secured, distributing the attachment points along the support structure. This segmentation prevents stress concentration at a single point while maintaining secure attachment through multiple distributed connection points.
Solution Approach 2:
A rolling hinge mechanism is introduced as an intermediary component between the support structure and the flexible display. The rolling hinge includes deformable sheets that can flex and deform to accommodate the flexible display's movement, while the support bars are attached to these sheets. This intermediary structure allows the support bars to be securely attached without directly bonding to the flexible display, thereby distributing stress and preventing damage to the display.
2Adaptability or versatility
If the flexible display is bent at a specific position, then the display can be folded, but the bending point becomes vulnerable to damage and waviness
Solution Approach 1:
The support structure incorporates dynamic elements, specifically deformable sheets within the rolling hinge that can flex and deform in response to the flexible display's bending. The support bars are attached to these deformable sheets, allowing the entire support structure to dynamically adapt to the display's shape changes. This dynamic design ensures that the support structure moves with the display rather than resisting the bending, preventing stress concentration and damage at the bending point.
Solution Approach 2:
The rolling hinge utilizes deformable sheets as flexible elements that can bend and flex to accommodate the flexible display's movement. These deformable sheets act as flexible connectors between the support bars and the flexible display, allowing the support structure to adapt to shape changes without creating rigid stress points. The flexibility of these thin film elements enables the display to be bent while maintaining structural support and preventing damage.
3Stability of the object's composition
If support bars are attached to the flexible display, then the display can be supported, but the support bars may transfer stress to the variable display portion causing waviness
Solution Approach 1:
The deformable sheets within the rolling hinge serve as intermediary elements between the support bars and the flexible display. These sheets can deform and flex to accommodate the display's shape changes, acting as a buffer that prevents direct stress transfer from the rigid support bars to the flexible display. This intermediary structure maintains structural stability while preventing the support bars from causing waviness in the display surface.
Solution Approach 2:
The deformable sheets change their physical parameters (shape, curvature, flexibility) in response to the flexible display's movement. As the display bends or changes shape, the deformable sheets adapt their configuration to match the new shape, thereby maintaining the support function while preventing stress concentration. This parameter change capability allows the support structure to maintain stability without transferring harmful stresses to the display surface.
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 solution allows for adjustable screen size while maintaining durability and preventing damage by evenly distributing stress, ensuring a smooth and flat display surface.
Implementation Method 1
a rolling hinge disposed on a rear surface of the flexible display and deformable in response to bending deformation of the flexible display
Implementation Method 2
a first rivet configured to penetrate the first hinge hole and the second hinge hole
Data Source
AI summary
The disclosure provides a mobile terminal including: a body including a first frame and a second frame configured to slide in a first direction with respect to the first frame and slide in a second direction; a flexible display configured to cover a part of the body, wherein a front surface area of the flexible display is configured to vary according to the sliding of the second frame; and a rolling hinge disposed on a rear surface of the flexible display and deformable in response to bending deformation of the flexible display. The rolling hinge includes: a first rolling sheet including a first hinge hole; a second rolling sheet overlapping with the first rolling sheet, wherein the second rolling sheet includes a second hinge hole overlapping at least partially with the first hinge hole; and a first rivet configured to penetrate the first hinge hole and the second hinge hole.