Rollable Display Adhesive Frame Gradient Thickness
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Solution Overview
Problem
Existing rollable display devices often experience stress concentration and frictional damage due to a stepped structure formed when the flexible screen is wound on a rotating shaft, leading to loose winding and potential peeling issues.
Innovation Solution
A rollable display device design featuring a flexible screen with a multi-segment adhesive frame whose thickness gradually decreases as it approaches the connecting end, coupled with a climbing adhesive structure for a smooth transition, and an optional magnetic support sheet for enhanced fixation, reducing the impact of the stepped structure and improving winding stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flexible screen is directly coupled to the rotating shaft, then the structure is simple, but a stepped structure occurs causing stress concentration and frictional damage
Solution Approach 1:
An adhesive frame is introduced as an intermediary component between the flexible screen and the rotating shaft. This adhesive frame includes a climbing structure that smoothly transitions from the flexible screen surface to the rotating shaft surface, eliminating the stepped structure and reducing stress concentration while maintaining structural simplicity.
2Ease of manufacture
If the adhesive frame has uniform thickness, then the manufacturing is simple, but the winding stress is concentrated at the edge
Solution Approach 1:
The adhesive frame employs a multi-segment structure where each segment has different thickness. The thickness gradually decreases from segments farther from the connecting end to segments closer to the connecting end. This gradient thickness distribution matches the stress distribution during winding, reducing stress concentration at the edge while maintaining manufacturing feasibility through modular segmentation.
3Device complexity
If the adhesive frame is made as a single piece, then the structure is simple, but the stress distribution is uneven during winding
Solution Approach 1:
The adhesive frame is divided into multiple segments arranged in sequence from the connecting end toward the rotating shaft. Each segment can have different thickness characteristics, allowing the structure to adapt to varying stress conditions during winding. This segmentation improves stress distribution uniformity while keeping each individual segment relatively simple in structure.
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 effectively eliminates the stepped structure, reducing winding stress and preventing peeling, while the magnetic support enhances fixation and smooth unwinding, ensuring a stable and secure rolling mechanism.
Implementation Method 1
a coupling position where the adhesive frame is coupled to the connecting end is provided with an adhesive layer
Implementation Method 2
the electromagnet is configured to, when a function section is wound on the scroll, provide a magnetic field acting on the support sheet so that the function section is fixed by magnetic adsorption
Data Source
AI summary
The present disclosure proposes a rollable display device, including a scroll and a flexible screen. The scroll includes a housing and a rotating shaft, the rotating shaft is rotatably disposed in the housing, and the flexible screen includes a connecting end, the flexible screen is coupled to the rotating shaft through the connecting end, and the flexible screen is configured to be retractably wound on the rotating shaft. The flexible screen includes a cover film and an adhesive frame. The cover film includes a connecting section adjoining the connecting end. The adhesive frame is disposed on a side of the connecting section of the cover film facing the rotating shaft. The connecting section is coupled to the rotating shaft through the adhesive frame, and an orthographic projection of the connecting section on a plane perpendicular to an axial direction of the rotating shaft is arc-shaped or spiral-shaped.