Roller Geometry for Rollable Display Routing Line Crack Reduction
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Solution Overview
Problem
Rollable display devices face issues with cracking in the routing line area due to repeated winding and unwinding, and interference from flexible films, which affects the display's reliability and durability.
Innovation Solution
A display device design featuring a roller with a flat portion and two curved portions of different radii, along with a back cover and cover units that maintain the routing line area flat, reducing stress and interference, and incorporating a chain cover to enhance the degree of freedom in the routing line area without compressing the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display device is wound and unwound repeatedly, then the display device can be stored in a compact form, but cracks occur in the routing line area
Solution Approach 1:
The roller is designed with different surface characteristics at different locations: a flat portion and curved portions with different radii of curvature. This local differentiation allows the roller to maintain the routing line area in a flat state during winding, preventing crack formation while enabling compact storage.
Solution Approach 2:
The roller's flat portion is positioned to contact and maintain the routing line area in a flat state before the winding process occurs. This preliminary flattening action prevents stress concentration and crack formation during subsequent winding and unwinding operations.
2Strength
If the flexible film is constrained during winding, then the display panel is protected, but the flexible film experiences interference and tension
Solution Approach 1:
Different portions of the roller have different radii of curvature tailored to match the specific requirements of different components. The flat portion protects the routing line area, while the curved portions accommodate the flexible film's winding needs, reducing interference and tension.
Solution Approach 2:
The roller's surface geometry is designed to dynamically adapt to the winding process, with the flat portion and curved portions working together to provide appropriate support and clearance at different locations, allowing the flexible film to wind smoothly without excessive tension or interference.
Data Source
AI summary
A display device according to an exemplary embodiment of the present disclosure includes a display panel, a back cover which supports the display panel on a rear surface of the display panel, a plurality of flexible films which is electrically connected to one end of the display panel and is disposed on one surface of the back cover, a printed circuit board which is electrically connected to the plurality of flexible films and disposed on the one surface of the back cover, and a roller to which the display panel and the back cover are wound or unwound, and the roller includes a flat portion and a first curved portion and a second curved portion having different radii of curvature. Accordingly, the damage of the plurality of flexible films and the printed circuit board may be reduced.