Rollable Display Device Thickness Reduction via Sliding Cases and Elastic Tension
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Solution Overview
Problem
Rollable display devices face challenges in reducing thickness and improving surface quality when the display panel is unwound and wound, as existing designs often result in bulkiness and potential damage from length deviations during rolling and unrolling.
Innovation Solution
A rollable display device design featuring a display panel with a supporter, a roller, and an elasticity member, where the supporter is bent to maintain an unfolded state while wound, and the elasticity member extends to apply tension, allowing the panel to be wound further outside the supporter, reducing thickness and preventing damage by sliding overlap of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display panel and supporter are wound on the roller, then the device thickness is reduced, but the surface quality of the display panel deteriorates due to peeling or cracking
Solution Approach 1:
The elasticity member is pre-installed between the first case and second case to apply continuous tension on the display panel before winding occurs. This preliminary tensile action prevents the display panel from peeling or cracking during the winding process, thereby maintaining surface quality while enabling thickness reduction through rolling.
Solution Approach 2:
The elasticity member dynamically changes the tensile parameter applied to the display panel during winding and unwinding operations. By adjusting the tension force through the elastic deformation of the member, the system maintains optimal surface quality across different operational states while enabling compact storage.
2Volume of moving object
If the display panel is wound further outside than the supporter, then the device thickness is reduced, but the reliability deteriorates due to potential damage from length deviations
Solution Approach 1:
The elasticity member dynamically adjusts the tensile parameter applied to the display panel during winding and unwinding operations. By changing the elastic deformation state of the member, the system optimizes the tension force to prevent peeling and cracking while accommodating length deviations, thereby maintaining reliability during compact winding.
Solution Approach 2:
The elasticity member serves as a cushioning element that absorbs and compensates for length deviations between the display panel and supporter during winding. This beforehand cushioning prevents sudden tension spikes that could cause damage, enabling the display panel to be wound further outside the supporter without compromising reliability.
3Volume of moving object
If the first case and second case overlap and slide, then the device thickness is reduced, but the complexity of the mechanical structure increases
Solution Approach 1:
The first case and second case are designed to dynamically overlap and slide relative to each other during winding and unwinding operations. This dynamic configuration allows the cases to adjust their positions based on the rolled state of the display panel, achieving compact thickness while using simple sliding mechanics rather than complex locking or actuating systems.
Solution Approach 2:
The first case and second case are merged into a single integrated housing structure that contains both the roller mounting and display panel attachment functions. This merging eliminates the need for separate protective housings, reducing overall complexity while maintaining the overlapping sliding mechanism for thickness reduction.
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 achieves a thinner profile and improved surface quality by maintaining tension and preventing peeling or cracking during winding and unwinding, ensuring a flat and defect-free display when unwound.
Implementation Method 1
an elasticity member connected between the first case and the second case
Implementation Method 2
the elasticity member may include an extension spring
Data Source
AI summary
A display device includes a display panel including a first surface which displays images and a second surface opposite to the first surface, a supporter disposed on the second surface of the display panel, a roller to which a first end of the display panel and a first end of the supporter are connected and on which the display panel and the supporter are wound, a first case to which a second end of the display panel opposite to the first end of the display panel is connected, a second case which is disposed on the first case and to which an end of the roller is connected, and an elasticity member connected between the first case and the second case, where the second case and the first case at least partly overlap each other and slide.