Rollable Display Edge Adhesion Structure for Flat Unrolling
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Solution Overview
Problem
Rollable display devices face deformation and strain issues when rolled due to stress generated during the rolling process, leading to separation of protection films from the display and curvature upon unrolling.
Innovation Solution
Incorporating a first and second protection film with adhesive layers and a first adhesion part with a higher modulus of elasticity, which adheres to the display edges and protection films, reducing strain and maintaining a flat unrolled state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rollable display is rolled around the roller, then the size of the entire device is reduced and portability is improved, but stress is generated causing deformation and strain in the adhesive layers
Solution Approach 1:
The patent employs flexible protection films (first and second protection films) that extend beyond the display edges and adhere to the flexible display. These thin films are specifically designed to accommodate the bending and rolling stresses, preventing deformation while maintaining the flexibility needed for rolling. The extension beyond edges allows the films to absorb stress without compromising the display structure.
Solution Approach 2:
The patent uses composite material structures including multiple adhesive layers (first and second adhesive layers) with different properties, and combines protection films with the flexible display in a layered composite structure. This composite approach allows each layer to contribute specific properties - some layers provide adhesion, others provide protection, and the combination resolves the contradiction between flexibility for rolling and stability during operation.
2Reliability
If protection films are applied to the display surface, then the display is protected, but the protection films may separate from the display when rolled due to stress
Solution Approach 1:
The patent divides the protection system into multiple segments: first protection film, second protection film, and first adhesion part, each serving specific functions. The first adhesion part is specifically positioned between the display edges and protection films to provide enhanced localized adhesion. This segmentation allows the system to maintain overall protection while addressing adhesion weaknesses at critical stress points.
Solution Approach 2:
The patent applies protection films and adhesive layers in advance before the rolling operation. The first and second adhesive layers are pre-applied to secure the protection films to the display surface, and the first adhesion part is pre-positioned at the edges. This preliminary bonding ensures that when rolling stress occurs, the films are already secured and less likely to separate.
3Ease of operation
If the display is unrolled after rolling, then the display can be used, but curvature remains due to stress deformation
Solution Approach 1:
The flexible protection films extend beyond the display edges and are designed to be more compliant than the display itself. When the display is unrolled, these extended films act as counterbalancing elements that help pull the display back to a flat state, reducing residual curvature while allowing the display to be used immediately upon unrolling.
Data Source
AI summary
A rollable display device includes a rollable display and a first protection film disposed on a first surface of the rollable display. The first protection film extends beyond a first display edge of the rollable display. The rollable display device further includes a second protection film disposed on a second surface of the rollable display facing the first surface of the rollable display. The second protection film extends beyond the first display edge of the rollable display. The rollable display device additionally includes a first adhesive layer disposed between the rollable display and the first protection film. The rollable display device further includes second adhesive layer disposed between the rollable display and the second protection film, and a first adhesion part disposed adjacent to the first display edge of the rollable display and between the first protection film and the second protection film.