Rollable Display Roller Layout to Prevent Cable Tangling and EMI
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Solution Overview
Problem
Existing rollable display devices face issues with cable tangling and electromagnetic interference (EMI) noise during winding and unwinding, particularly due to the movement of the inner roller and the presence of printed circuit boards and cables within the roller.
Innovation Solution
The display device incorporates an inner roller that accommodates the printed circuit board and cable, configured to reverse-rotate with respect to the outer roller, minimizing cable movement and spacing it away from the roller to reduce EMI noise, while using an intermediate gear to ensure opposite directions of rotation between the rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner roller is allowed to move freely during winding and unwinding, then the display device can be easily wound and unwound, but the cable becomes tangled
Solution Approach 1:
The inner roller is configured to rotate in the opposite direction to the outer roller during winding and unwinding operations. This reverse rotation counteracts the cable winding effect, preventing cable tangling while maintaining smooth operation of the display device
Solution Approach 2:
A gear mechanism is introduced as an intermediary between the inner and outer rollers to transmit and reverse the rotational motion. The gear converts the outer roller's rotation into opposite-direction rotation of the inner roller, solving the cable tangle problem while preserving operational ease
2Volume of moving object
If the cable is placed close to the roller for compact design, then the device size is reduced, but electromagnetic interference noise increases
Solution Approach 1:
The cable is extracted from the immediate vicinity of the roller by routing it through a cable guide structure that positions it at a distance from the roller surface. This separation reduces electromagnetic interference while maintaining compact overall device dimensions through optimized space utilization
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
This configuration effectively reduces cable tangling and minimizes EMI noise, enhancing the operational reliability and performance of the rollable display device.
Implementation Method 1
an intermediate gear which interworks the rotation of the outer roller with the rotation of the inner roller, and when the display unit is wound or unwound, the outer roller and the inner roller rotate in opposite directions, by the intermediate gear
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes a display unit which includes a display panel and a back cover supporting a rear surface of the display panel; an external roller configured to wind or unwind the display unit; an inner roller in the outer roller; and an intermediate gear which interworks a rotation of the outer roller with a rotation of the inner roller, and responsive to the display unit being wound or unwound, the outer roller and the inner roller rotate in opposite directions, by the intermediate gear.