Flexible Display Panel Buffer Layer for Metal Plate Peeling
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Solution Overview
Problem
Current flexible display devices experience peeling of the metal plate in bending areas due to differences in bending coefficients between the back plate and metal plate materials.
Innovation Solution
A flexible display module is designed with a back plate in non-bending areas and a buffer material layer in bending areas, where the buffer material layer is bonded to both the back plate and metal plate, providing better bending resistance and alleviating peeling issues by buffering stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a back plate and metal plate with different bending coefficients are used in the bending area, then the structural support is provided, but the metal plate peels off from the adhesive layer due to stress difference
Solution Approach 1:
The back plate is segmented into a first back plate positioned in the non-bending area and a second back plate positioned in the bending area. This segmentation allows different regions to have different structural characteristics suitable for their functional requirements.
Solution Approach 2:
The second back plate in the bending area is designed with a bending coefficient that matches the metal plate's bending coefficient, creating local quality optimization. This localized matching of bending coefficients prevents stress concentration and peeling at the adhesive interface in the bending region.
2Strength
If hard materials are used for both back plate and metal plate, then structural rigidity is achieved, but the adhesive layer cannot buffer bending stress effectively
Solution Approach 1:
The bending coefficient parameter of the second back plate is specifically adjusted to match the metal plate's bending coefficient. This parameter change enables stress distribution during bending, preventing stress concentration that would otherwise cause adhesive failure.
3Strength
If the back plate extends into the bending area, then continuous support is provided, but the difference in bending coefficients causes peeling of the metal plate
Solution Approach 1:
The second back plate in the bending area is designed with a bending coefficient that matches the metal plate's bending coefficient, creating local quality optimization. This localized matching of bending coefficients prevents stress concentration and peeling at the adhesive interface in the bending region.
Solution Approach 2:
The back plate is segmented into a first back plate positioned in the non-bending area and a second back plate positioned in the bending area. This segmentation allows different regions to have different structural characteristics suitable for their functional requirements.
Data Source
AI summary
A flexible display module, a manufacturing method thereof, and a flexible display device are provided. The flexible display module includes a flexible display panel; a back plate, a buffer material layer, a first adhesive layer, and a metal plate under the flexible display panel; a polarizer, a second adhesive layer, and a cover plate on the flexible display panel. The back plate is positioned in a non-bending area. The buffer material layer is positioned in a bending area and is disposed in a same layer as the back plate. A side of the first adhesive layer is bonded to the back plate and the buffer material layer, and another side thereof is bonded to the metal plate.