Rollable Display Structure With Variable-Width Units for Stress Relief
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Solution Overview
Problem
Conventional rollable display devices experience stress and potential damage or separation of the display panel structure when rolled and unrolled, due to the lack of a mounting structure to manage stress during these cycles.
Innovation Solution
A rollable display device design featuring a rollable structure composed of multiple unit structures with increasing widths and adjustable curvature, where each unit includes a flat region that remains flat and a bendable region that changes shape, allowing for multiple rolling cycles without applying stress to the display panel, thereby preventing damage or separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mounting structure is added to prevent stress damage, then reliability improves, but device complexity increases
Solution Approach 1:
The patent removes the mounting structure entirely by redesigning the rollable structure to inherently manage stress through its unit structure configuration. The display panel structure is directly attached to the rollable structure without additional mounting components, extracting the mounting structure from the system while maintaining reliability through the optimized unit structure design.
Solution Approach 2:
The rollable structure is divided into multiple unit structures with different widths, where each unit structure has specific local characteristics. The widths of unit structures increase from the first side to the second side, creating local quality variations that distribute stress appropriately across different regions during rolling and unrolling operations.
2Area of stationary object
If the display panel structure is made larger, then image quality improves, but portability deteriorates
Solution Approach 1:
The rollable structure is segmented into multiple unit structures that can be rolled sequentially. This segmentation allows the large display panel to be folded into a compact form factor for portability while maintaining the large display area when unrolled. The unit structures enable the display to be divided into manageable sections for rolling without compromising the overall display size.
Solution Approach 2:
The patent transitions the display from a two-dimensional flat surface to a three-dimensional rolled structure. When not in use, the display panel is rolled into a compact cylindrical or spiral form, utilizing the third dimension for storage. When in use, it unrolls to provide a large flat display area, effectively managing both size and portability through dimensional transformation.
3Manufacturing precision
If unit structures have uniform width, then manufacturing precision is easier to maintain, but stress distribution during rolling deteriorates
Solution Approach 1:
The patent intentionally introduces asymmetry in the widths of unit structures, with widths increasing from the first side to the second side of the rollable structure. This asymmetric design creates optimal stress distribution during rolling and unrolling operations, preventing stress concentration that would occur with uniform widths while remaining manufacturable through standard fabrication processes.
Data Source
AI summary
A rollable display device includes a rollable structure including a plurality of unit structures, the rollable structure being configured to be rolled and unrolled based on the unit structures, and a display panel structure attached to the rollable structure, wherein respective widths of the unit structures increase in a first direction from a first side of the rollable structure to an opposite second side of the rollable structure.