Roller Assembly With Conductive Balls for EMI-Safe Rollable Displays
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Solution Overview
Problem
Rollable display devices face issues with image display quality and smooth operation in a rolled state, and electromagnetic interference noise generated by printed circuit boards within the roller unit.
Innovation Solution
A display device design incorporating an outer roller with a spiral groove, an inner roller with a straight groove, and conductive balls between them to control resonance length and minimize electromagnetic interference, along with a roller connection unit to interlink rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a printed circuit board is inserted in the roller unit, then the rollable display device can display images in a rolled state, but electromagnetic interference noise is generated
Solution Approach 1:
Conductive balls are introduced as intermediary elements between the inner and outer rollers. These conductive balls serve as mediators that both ground electromagnetic interference from the printed circuit board and control the resonance length of the roller unit, thereby reducing EMI noise while maintaining the image display capability in rolled state
Solution Approach 2:
The resonance length of the roller unit is controlled by adjusting the position and distribution of conductive balls between the rollers. By changing the effective electrical length parameter of the roller unit, the resonance frequency is shifted away from the operating frequency of the printed circuit board, minimizing electromagnetic interference
2Device complexity
If the roller unit length is fixed, then the structure is simple, but the resonance frequency cannot be adjusted to avoid electromagnetic interference
Solution Approach 1:
Conductive balls serve as adjustable intermediary elements that can be positioned at different locations between the inner and outer rollers. This allows the effective resonance length of the roller unit to be controlled without changing the physical dimensions of the roller unit structure, maintaining structural simplicity while achieving electromagnetic interference control
Solution Approach 2:
The system transitions from a static fixed-length roller unit to a dynamically adjustable resonance length by positioning conductive balls at different locations. This dynamic control allows the resonance frequency to be adjusted to avoid electromagnetic interference from the printed circuit board
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
Improves image display quality and operational smoothness in a rolled state while reducing electromagnetic interference noise, enhancing the overall performance of rollable display devices.
Implementation Method 1
a plurality of conductive balls which is disposed between the outer roller and the inner roller and configured to move along the spiral groove when the display unit is wound or unwound
Implementation Method 2
a resonance frequency of a roller unit which accommodates a printed circuit board is avoided to minimize the generation of the electromagnetic interference noise
Data Source
AI summary
A display device in one example includes a display unit, an outer roller configured to wind or unwind the display unit and including an inner circumferential surface having a spiral groove, an inner roller disposed in the outer roller and including an outer circumferential surface having a straight groove, a plurality of conductive balls disposed between the outer roller and the inner roller, and a roller connection unit interlinking rotations of the outer roller and the inner roller. The display unit can include a display panel and a back cover supporting a rear surface of the display panel. Further, the plurality of conductive balls can be configured to move along the spiral groove when the display unit is wound or unwound.