Rollable Display Panel Curvature Control to Prevent Cracks
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Solution Overview
Problem
Rollable display devices face issues with stains, cracks, and separation of the display panel during the rolling process due to uneven curvature and empty spaces, which affect their reliability and functionality.
Innovation Solution
Implementing a roller with a uniform radius of curvature and a variable cover that moves up and down to ensure a consistent curvature over the entire section, reducing stress and empty spaces, thereby preventing stains, cracks, and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rollable display device is designed to be flexible and wound around a roller, then the display device can be rolled up for portability, but stains, cracks, and separation of the display panel occur during rolling due to uneven curvature and empty spaces
Solution Approach 1:
The patent applies curvature uniformity by designing the roller with a specific radius of curvature and shaping the cover unit to match this curvature. The cover unit includes a curved surface that conforms to the roller's curvature, ensuring uniform stress distribution during rolling and preventing display panel defects.
Solution Approach 2:
The patent uses a flexible cover unit that can deform to match the roller's curvature. This flexible shell structure allows the cover to conform to the curved surface during rolling while maintaining protection over the display panel, preventing cracks and separation.
2Strength
If the cover unit is made rigid to protect the display panel, then protection is improved, but the cover unit cannot adapt to the curved surface during rolling, causing empty spaces and defects
Solution Approach 1:
The cover unit is designed as a flexible shell that can deform to match the roller's curvature. This flexibility allows the cover to maintain continuous contact with the curved display panel during rolling, eliminating empty spaces while still providing protective coverage.
Solution Approach 2:
The cover unit transitions from a static rigid structure to a dynamic flexible structure that can adapt its shape. The flexible material allows the cover to dynamically conform to the curved surface during rolling operations, ensuring continuous contact and protection.
3Volume of moving object
If the roller has a small radius of curvature to reduce size, then compactness is improved, but stress concentration increases causing cracks and separation of the display panel
Solution Approach 1:
The patent optimizes the roller's radius of curvature parameter to balance compactness and stress distribution. By selecting an appropriate radius value, the design achieves sufficient compactness while maintaining uniform stress distribution during rolling, preventing display panel cracks and separation.
Solution Approach 2:
The patent uses a carefully designed curvature radius that is large enough to distribute stress uniformly across the display panel during rolling, yet small enough to achieve compact form factor. The curved surface geometry is optimized to prevent stress concentration points.
Data Source
AI summary
A display device may include a display panel in which a plurality of pixels is defined, a back cover disposed on a bottom surface of the display panel, a roller which winds or unwinds the back cover and the display panel and a cover unit which is disposed at a lower side of the display panel and includes a variable cover which moves up or down as the display panel is wound or unwound. Stain, cracks, and separation of the display panel which are caused during the rolling may be reduced.