Rollable Display Structure With Homogeneous Resin to Prevent Creases
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Solution Overview
Problem
Existing flexible display devices face issues with surface quality deterioration due to stress concentration and crease generation when rolled, particularly at the boundaries between different structural components.
Innovation Solution
The display device incorporates a support part, dummy part, and shaft made of the same resin, with specific thickness and curvature differences to prevent stress concentration, ensuring seamless integration and minimizing crease formation during rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display module is rolled on the shaft, then the flexible display device achieves portability and improved user convenience, but stress concentration and crease generation occur at the boundaries between different structural components, deteriorating surface quality
Solution Approach 1:
The dummy part, support part, and shaft are made of the same resin material, ensuring uniform mechanical properties throughout the rolling structure. This homogeneity prevents stress concentration at material boundaries and eliminates crease formation, maintaining surface quality while enabling flexible rolling for portability
Solution Approach 2:
The dummy part, support part, and shaft are integrated into a single unified structure rather than separate components. This merging eliminates boundaries between parts, preventing stress concentration and crease generation at interfaces, while the combined structure maintains the necessary rolling function for portability
2Manufacturing precision
If the thickness of the dummy part is increased to prevent stress concentration, then surface quality is improved, but the overall size and volume of the rolling structure increases
Solution Approach 1:
The thickness of the dummy part is precisely controlled within an optimal range (0-50 micrometers height difference from display module top surface) rather than being excessively thick. This parameter optimization provides sufficient stress distribution to prevent creases while maintaining a compact rolling structure with minimal volume
3Manufacturing precision
If the curvature difference between the shaft and dummy part is minimized to prevent creases, then surface quality is improved, but the manufacturing complexity increases
Solution Approach 1:
The dummy part, support part, and shaft are manufactured as a single integrated component rather than separate parts requiring precise alignment. This merging simplifies manufacturing by eliminating the need to control curvature matching and boundary alignment between multiple components, while still achieving the desired surface quality through uniform material properties and optimized geometry
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
This design enhances the surface quality of flexible display devices by preventing creases and maintaining smooth rolling, thereby improving user experience and device durability.
Implementation Method 1
The support part, the dummy part, and the shaft may include a same resin... A thickness of the dummy part may be greater than a thickness of the support part... A difference between a height of a top surface of the display module disposed on the support part and a height of a top surface of the dummy part may be in a range of about 0 micrometer to about 50 micrometers
Data Source
AI summary
A display device including a display module, a support part disposed below the display module, a dummy part extended to an end of the support part, and a shaft which may extend to an end of the dummy part and which may have a rotary axis extending in a first direction, the display module may be wound or unwound about the shaft. The support part, the dummy part, and the shaft may include the same resin.