Rollable Display Roller Segmentation for Film Protection
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Solution Overview
Problem
Rollable display devices face issues with damage to flexible films and printed circuit boards due to repeated winding and unwinding, stress on display panels from excessive bending, and separation between the back cover and display panel when rolled.
Innovation Solution
A display device design featuring a roller with a first flat portion for the flexible film and a second flat portion for the printed circuit board, along with a curved portion, to minimize damage and stress, and a cover unit system to maintain the display panel's end within the back cover, ensuring a larger seating area for the flexible film and printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display panel is wound around a cylindrical roller, then the display device can be rolled up for compact storage, but the flexible film and printed circuit board are damaged due to repeated bending
Solution Approach 1:
The roller surface is segmented into multiple flat portions and curved portions alternately arranged along the winding direction. The flat portions provide bending-free zones for the flexible film and printed circuit board, while the curved portions enable compact rolling. This segmentation resolves the contradiction by creating dedicated zones that protect sensitive components during the rolling process.
Solution Approach 2:
Different portions of the roller surface are given different geometric qualities - flat portions for protecting the flexible film and printed circuit board from bending damage, and curved portions for enabling compact rolling. This local differentiation of surface quality allows the roller to simultaneously protect sensitive components and achieve compact storage volume.
2Ease of operation
If the display panel is wound around a cylindrical roller, then the display device can be rolled up, but excessive stress is applied to the display panel
Solution Approach 1:
The roller surface is divided into flat portions and curved portions. The flat portions create stress-free zones where the display panel experiences minimal bending stress, while the curved portions enable the rolling operation. This segmentation reduces overall stress on the display panel while maintaining rolling capability.
3Volume of moving object
If the display panel is wound around a cylindrical roller, then the display device can be rolled up, but separation occurs between the back cover and display panel
Solution Approach 1:
The roller surface segmentation into flat and curved portions creates stable zones (flat portions) where the back cover and display panel remain in close contact, preventing separation. The curved portions enable rolling while the flat portions maintain structural integrity through stress-free bonding zones.
Data Source
AI summary
A display device includes: a display panel, a back cover which supports the display panel on a rear surface of the display panel; at least one flexible film which is electrically connected to one end of the display panel and is on one surface of the back cover; a printed circuit board which is electrically connected to the at least one flexible film and on one surface of the back cover; and a roller on which the display panel and the back cover are wound or unwound, the roller being configured by a first flat portion, a second flat portion, and a curved portion. When the display panel and the back cover are fully wound around the roller, the at least one flexible film corresponds to the first flat portion, and the printed circuit board corresponds to the second flat portion.