Dual-Roller Winding System for Rollable Display Creep Control
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Solution Overview
Problem
Rollable displays experience creep and buckling issues due to length differences between layers, leading to reduced durability and functionality, as the laminate at the inside of the curvature extends beyond the edge of the outer laminate when bent, causing misalignment and potential delamination.
Innovation Solution
A second roller is introduced to counteract mechanical strain in the multilayer structure by applying different rolling strategies, ensuring that the first and second rollers cooperate to minimize creep and buckling, maintaining layer alignment during rolling and unrolling, particularly beneficial for flexible and color displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single roller is used to wind the multilayer structure, then the device structure is simple, but creep and buckling occur due to length differences between layers
Solution Approach 1:
The winding system is segmented into two separate rollers (first roller and second roller) that independently support different portions of the multilayer structure. This segmentation allows each roller to be optimized for specific functions, with the first roller handling the leading end and the second roller handling the trailing end, thereby preventing creep and buckling while maintaining structural manageability
Solution Approach 2:
The second roller acts as an intermediary element that receives the trailing end of the multilayer structure and applies counteracting mechanical strain. This intermediary roller mediates the forces between the winding process and the multilayer structure, preventing direct transmission of harmful stresses that would cause layer misalignment
2Volume of moving object
If the multilayer structure is wound tightly to save space, then the rolled-up size is reduced, but mechanical strain increases causing creep and delamination
Solution Approach 1:
The second roller provides a counterbalancing force that opposes the mechanical strain generated during winding. By positioning the second roller to receive the trailing end and apply counteracting force, the system neutralizes the compressive and tensile stresses that would otherwise cause creep, buckling, and layer delamination during tight winding
Solution Approach 2:
The winding system transitions from a static single-point support to a dynamic two-roller system where forces are continuously balanced during the winding process. The first and second rollers work in coordination to maintain force equilibrium, allowing the multilayer structure to be wound tightly without accumulating harmful mechanical strain
3Speed
If the multilayer structure is bent into a tight curvature, then the rolling radius is reduced, but the inner laminate extends beyond the outer laminate causing misalignment
Solution Approach 1:
The first roller is positioned to receive and stabilize the leading end of the multilayer structure before the winding process begins. This preliminary action ensures that the layers are properly aligned and positioned at the start of curvature, preventing misalignment from occurring during subsequent tight bending and high-speed rolling operations
Data Source
AI summary
The invention relates to a device comprising a multilayered structure with a first portion and a second portion wherein the first portion is conceived to be rolled about a first roller, said device comprising a second roller for receiving the second portion for at least partially counteracting the effects of mechanical strain induced in the multilayered structure upon said rolling. The first roller is rotated in a first direction, whereby the second roller is rotated in a second direction. Preferably, the diameters of the first roller and the second roller are equal. Alternatively, the edge portions A, B of the multilayer structure are suitably interconnected by stoppers for preventing creeping.