Rollable Display Pad Area Flatness and PCB Protection
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Solution Overview
Problem
Rollable display devices face issues with damage from repeated winding and unwinding, separation between the back cover and display panel, stress on vulnerable areas, and heat dissipation during operation.
Innovation Solution
A rollable display device design featuring a display panel, a first back cover, at least one flexible film, and a printed circuit board, where the printed circuit board overlaps the display panel to maintain the pad area flat, minimizing damage and separation, and includes a cover unit to accommodate the display panel end, preventing loosening and facilitating heat dissipation through a heat dissipating member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made rollable with flexible components, then the display area and portability are improved, but the components are subjected to repeated bending stress causing damage
Solution Approach 1:
The patent divides the display device into distinct functional modules: a rollable display panel, a separate printed circuit board, and a cover unit. This segmentation allows each component to be optimized independently - the display panel can be made flexible for rolling, while the PCB and vulnerable pad areas remain flat and protected, resolving the contradiction between rollability and component durability.
Solution Approach 2:
The patent introduces a cover unit as an intermediary structure that houses the printed circuit board and pad areas. This cover unit acts as a mediator between the flexible display panel and the rigid PCB, allowing the display to be rolled while keeping the electronic components flat and protected from bending stress, thus improving reliability without sacrificing rollability.
2Volume of moving object
If the display panel is wound around a roller, then the device volume is reduced, but separation between the back cover and display panel occurs
Solution Approach 1:
The patent implements a nested structure where the display panel, back cover, and cover unit are sequentially contained within each other when rolled. The display panel is rolled around a roller, the back cover is wrapped around it, and the cover unit containing the PCB is nested inside. This nested arrangement maintains stable attachment between components during rolling while achieving compact volume.
3Reliability
If the pad area is kept flat to prevent damage, then the printed circuit board reliability is improved, but the flexibility of the overall display device is reduced
Solution Approach 1:
The patent segments the device into a flexible display panel portion and a rigid PCB portion housed in a cover unit. This allows the display panel to be flexible and rollable while the PCB and pad areas remain flat and protected, resolving the contradiction between flexibility and PCB reliability.
Solution Approach 2:
The patent resolves the flexibility-reliability contradiction by transitioning to a three-dimensional nested structure. The flexible display panel rolls in one dimension, while the rigid PCB is protected in another dimension within the cover unit, allowing both flexibility of the display and stability of the electronics to coexist.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design minimizes damage to flexible films and the printed circuit board, maintains the display panel flat to prevent separation, and effectively dissipates heat, enhancing the reliability and performance of the rollable display device.
Implementation Method 1
easily dissipating heat of a plurality of flexible films
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A display device (100, 2000, 3000) according to an exemplary embodiment of the present disclosure includes a display panel (120), a first back cover (110a, 2110, 3110) disposed on a rear surface of the display panel (120), at least one flexible film (130, 2130, 3130) which is electrically connected to one end of the display panel (120) and is bent toward a rear surface of the first back cover (110a, 2110, 3110) or a front surface of the display panel (120), and a printed circuit board (140, 2140, 3140) which is electrically connected to the at least one flexible film (130, 2130, 3130) and disposed on the rear surface of the first back cover (110a, 2110, 3110) or the at least one flexible film (130, 2130, 3130). The printed circuit board (140, 2140, 3140) overlaps one end of the display panel (120). Accordingly, one end of the display panel (120) in which the pad area which is vulnerable to the stress is disposed and the printed circuit board (140, 2140, 3140) are maintained to be flat, to minimize the damage of the display device.