Rollable Display Protection Film Structure for Flat Unrolling
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Solution Overview
Problem
Rollable display devices face deformation and stress issues when rolled due to the strain generated by the rolling mechanism, leading to separation of protection films from the display and curvature during unrolling.
Innovation Solution
A rollable display device design incorporating first and second protection films extending beyond the display edges, with adhesive layers and adhesion parts to manage stress, including a first adhesion part with higher modulus of elasticity to reduce shear strain and prevent film separation, ensuring the device unrolls flat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rollable display device is rolled around a roller to reduce size, then portability is improved, but stress and strain are generated causing deformation and film separation
Solution Approach 1:
The protection film structure is segmented into multiple layers: a first protection film on the first surface, a second protection film on the second surface, and a third protection film extending beyond the display edges. This segmentation allows each layer to bear and distribute stress differently during rolling, preventing concentrated stress points that would cause separation or deformation.
Solution Approach 2:
The third protection film is specifically positioned to extend beyond the display edges of the rollable display, creating a local quality enhancement at the critical edge regions. This extended film structure provides additional reinforcement exactly where stress concentrates during rolling, preventing film separation at the edges while maintaining overall flexibility.
2Reliability
If protection films are added to prevent separation, then film adhesion is improved, but device complexity increases
Solution Approach 1:
Multiple protection films (first, second, and third films) are merged into a unified protective system where the third film acts as a common reinforcement layer connecting the first and second films at the edges. This merging approach consolidates the protective function across multiple layers while maintaining a relatively simple overall structure that leverages the synergistic effect of combined films.
3Volume of moving object
If the display is rolled tightly to minimize size, then portability is improved, but curvature and deformation occur during unrolling
Solution Approach 1:
The third protection film is pre-configured to extend beyond the display edges before rolling occurs. This preliminary structural arrangement creates a stress-distributing framework that is already in place before rolling, preventing the formation of concentrated stress points that would lead to curvature or deformation during the unrolling process.
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 solution effectively suppresses deformation and maintains the display in a flat state upon unrolling by distributing stress and preventing film separation, enhancing the rollable display device's structural integrity and usability.
Implementation Method 1
a first adhesion part disposed adjacent to the first display edge and between the first protection film and the second protection film
Implementation Method 2
a first adhesive layer disposed between the rollable display and the first protection film, a second adhesive layer disposed between the rollable display and the second protection film
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.