Rollable Display Device Roller Mechanism 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 repetitive winding and unwinding, stress on the display panel, delamination between the flexible film and panel, and heat management in driver ICs.
Innovation Solution
The design incorporates a roller with flat and curved portions to maintain a flat pad area, reducing contact failure and stress, and includes a film cover and buffer pad to absorb shock and manage heat efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is wound and unwound repeatedly, then the rollable display function is achieved, but damage to the flexible film and printed circuit board increases
Solution Approach 1:
The patent introduces a buffer pad positioned between the pad area and the flexible film that absorbs shock and stress before they can damage the flexible film and printed circuit board. This cushioning element is pre-installed to protect against repetitive winding and unwinding damage, directly resolving the contradiction between achieving rollable function and preventing component damage.
2Volume of moving object
If the display device is wound around a roller, then compact storage is achieved, but stress on the display panel increases
Solution Approach 1:
The patent applies different structural qualities to different regions of the display device. The pad area is designed with a buffer pad for shock absorption, while the display panel area maintains its structural integrity. This localized quality differentiation allows the device to be wound compactly while protecting the display panel from excessive stress.
3Reliability
If the flexible film is bonded to the display panel, then electrical connection is achieved, but delamination occurs when wound around a roller
Solution Approach 1:
The buffer pad serves as an intermediary element between the pad area and the flexible film. It mediates the mechanical stress and tension that would otherwise cause delamination, allowing the flexible film to remain bonded to the display panel while accommodating the stresses of winding and unwinding through its shock-absorbing properties.
4Extent of automation
If the driver IC is mounted on the flexible film, then display control is achieved, but heat generation causes performance degradation
Solution Approach 1:
The patent utilizes the flexible film as a thermal management medium. The flexible film with its large surface area acts as a heat dissipation pathway for the driver IC, allowing heat to be distributed and dissipated across the flexible structure, thereby preventing localized overheating and performance degradation while maintaining the automated display control function.
Data Source
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AI summary
There is provided a display device (100, 1000, 1100, 1200, 1300, 1400) including: a display panel (120); a back cover (110) supporting the display panel (120) on a rear surface of the display panel (120); one or more flexible films (130) electrically connected to one end of the display panel (120) and disposed on a surface of the back cover (110); a film cover covering the one or more flexible films (130) and the end of the display panel (120); a printed circuit board (140) electrically connected to the one or more flexible films (130) and disposed on the surface of the back cover (110); and a roller (171) comprising a first flat portion (171Fa), a second flat portion (171Fb) and a curved portion (171R). The display panel (120) and the back cover (110) are wound around or unwound from the roller (171). The end of the display panel (120) is disposed in line with the first flat portion (171Fa) while the printed circuit board (140) is disposed in line with the second flat portion (171Fb) when the display panel (120) and the back cover (110) are fully wound around the roller (171). Accordingly, the end of the display panel (120) to which at least one flexible film (130) is bonded remains flat all the time, so that damage to the at least one flexible film (130) and the display panel (120) can be reduced while the display device (100, 1000, 1100, 1200, 1300, 1400) is wound or unwound.