Foldable Backplate Adhesive Layer Design for Durability
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Solution Overview
Problem
Conventional foldable display back plates require additional processes and materials for attaching supports, which can lead to damage and increased costs, as they rely on adhesive agents and tackifiers for deformation guidance.
Innovation Solution
A foldable back plate design featuring polyimide substrates with dual adhesive layers and release films, ensuring strong adhesion and controlled peel forces to attach supports without additional processing steps, thereby enhancing durability and reducing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional back plates use adhesive agents and tackifiers for attaching supports, then attachment is achieved, but additional processes and materials are required increasing complexity and cost
Solution Approach 1:
The patent combines the adhesive function directly into the back plate structure by providing adhesive layers on both surfaces of the back plate. This merging of the adhesive agent with the back plate eliminates the need for separate adhesive application processes and additional tackifier materials, thereby simplifying the manufacturing process while maintaining attachment capability.
Solution Approach 2:
The adhesive layers are pre-applied to the back plate surfaces during back plate manufacturing, before the actual attachment of supports or display panels. This preliminary action eliminates the need for separate adhesive application steps during assembly, reducing process complexity and enabling direct attachment operations.
2Strength
If adhesive layers are applied to both surfaces of the back plate, then attachment strength is improved, but the risk of damage during folding increases
Solution Approach 1:
The patent applies different adhesive layers with different properties to different surfaces of the back plate. The first adhesive layer on the front surface has different characteristics than the second adhesive layer on the back surface, allowing each layer to be optimized for its specific function and folding conditions, thereby maintaining strength while reducing damage risk.
Solution Approach 2:
The patent specifies particular parameter ranges for the adhesive layers including adhesive force (500-2000 gf/inch), thickness (10-100 μm), and storage modulus at different temperatures. These parameter optimizations ensure the adhesive layers provide sufficient strength for attachment while maintaining flexibility to accommodate folding deformations without causing damage.
3Ease of operation
If release films with low peel force are used, then easy removal is achieved, but adhesion stability during folding may be compromised
Solution Approach 1:
The release films are applied to the adhesive layers in advance during manufacturing, protecting the adhesive surfaces and preventing premature bonding. The films are designed with controlled peel forces that allow easy removal when needed while maintaining adhesion stability during the folding process, as the release films prevent unwanted adhesion until intentionally removed.
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 allows for reliable attachment of supports to foldable display panels without additional adhesive processes, minimizing damage and processing steps, while maintaining adhesion and durability even under repeated folding and high-temperature conditions.
Implementation Method 1
a first adhesive layer provided on one surface of the polyimide substrate; and a second adhesive layer provided on an opposite surface of the surface of the polyimide substrate in contact with the first adhesive layer
Implementation Method 2
the peel force at 23° C. of the second release film from the second adhesive layer is 20 gf/inch or less, and the peel force of the first release film from the first adhesive layer is lower than the peel force of the second release film from the second adhesive layer
Data Source
AI summary
Provided are a foldable back plate, a method of manufacturing the same and a foldable display device comprising the same.