Rollable Display Roller Flat Portion Fastening
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Solution Overview
Problem
Rollable display devices face issues such as grinding phenomena, damage to the display panel, creases, and noise due to the interaction between the fastening member and the cover part during winding, as well as dislocation and abrasion caused by length or fastening tolerances between covers.
Innovation Solution
A rollable display device design featuring a roller with a flat and curved part, where the fastening member is positioned on the second flat portion, and a cover part with a guide portion and groove to minimize contact and ensure proper seating, reducing damage and noise, and a cover assembly that accommodates the printed circuit board to maintain it in a flat state during rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fastening member is positioned on the first flat portion of the roller, then the cover part can be easily fastened, but grinding phenomenon occurs between the fastening member and cover part during winding
Solution Approach 1:
The roller's flat portion is divided into two distinct flat portions (first and second) at different radial positions. The first flat portion is used for seating the cover part during winding to prevent grinding, while the second flat portion is used for positioning the fastening member. This segmentation allows each portion to serve its specific function without interference, eliminating the grinding phenomenon while maintaining ease of fastening.
2Stability of the object's composition
If the cover part contacts the roller surface during winding, then the cover part is supported, but abrasion and noise occur between the cover part and roller
Solution Approach 1:
The first flat portion of the roller acts as an intermediary surface between the cover part and the roller body during winding. By providing a dedicated flat seating area, it ensures stable support and proper positioning of the cover part without direct rubbing contact that would cause abrasion and noise. The flat portion mediates the interaction, allowing controlled contact for support while preventing harmful friction.
3Object-affected harmful factors
If the fastening member is positioned closer to the roller center, then damage to the cover part is minimized, but the cover part may dislocate due to length or fastening tolerances
Solution Approach 1:
The roller surface is segmented into two functional zones: the first flat portion for seating the cover part and the second flat portion for positioning the fastening member. By placing the fastening member on the second flat portion (closer to the center) while providing the first flat portion for cover support, the design minimizes stress concentration on the cover part, reducing damage risk. Simultaneously, the dedicated seating area prevents dislocation by ensuring proper alignment despite manufacturing tolerances.
4Ease of operation
If the roller has a completely curved surface, then the display panel can be wound smoothly, but creases occur in the display panel due to length or fastening tolerances
Solution Approach 1:
The roller surface is divided into curved portions for smooth winding and flat portions for precise positioning. The curved portions allow the display panel to wrap smoothly around the roller, while the flat portions (first and second flat portions) provide stable seating areas that accommodate length and fastening tolerances. This segmentation prevents creases by ensuring the panel is properly supported at critical positions during the winding process.
Data Source
AI summary
A display device includes a display panel, a first cover supporting a rear surface of the display panel and a second cover with a first end of the second cover connected to the first cover. The display device also includes a roller to which a second end of the second cover is fixed with the roller configured to wind or unwind the display panel. The display device further includes a fastening member configured to fix the second end of the second cover to the roller. The roller includes a flat part and a curved part, and the flat part includes a first flat portion and a second flat portion that is closer to a center surface of the roller than the first flat portion. The fastening member is disposed on the second flat portion.