Support Film Hollow Structure for Flexible Display Bending
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Solution Overview
Problem
Flexible OLED displays suffer from peeling and fracture issues due to uncoordinated deformations between the support layer and film layers during bending, leading to low production yields and short lifespans.
Innovation Solution
A support film layer with a bending region featuring periodically arranged elliptical and shuttle-shaped hollow structures, which reduces stress concentrations and enhances ductility, thereby improving bending performance and reducing the risk of peeling and fracture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a thinner stainless-steel plate is used as support layer to ensure overall flatness, then flatness is improved, but peeling occurs between film layers due to uncoordinated deformations during bending
Solution Approach 1:
The support layer is designed with different structural characteristics in different regions: the bending region contains periodically arranged hollow structures to reduce stress concentration and improve flexibility, while non-bending regions maintain the original thin stainless-steel plate structure to ensure flatness. This local differentiation allows each region to perform its specific function optimally.
Solution Approach 2:
The support layer is divided into distinct functional zones: bending regions with hollow structures and non-bending regions with solid plate structure. This segmentation allows the bending regions to accommodate deformations while non-bending regions maintain structural integrity and flatness, preventing peeling between layers.
2Reliability
If a grid-shaped patterned structure is formed in the bending region to solve peeling problem, then peeling is reduced, but partial fracture occurs in long-term bending fatigue test
Solution Approach 1:
The support layer incorporates hollow structures (circular, rectangular, or elliptical cross-sections) within the bending region, creating a porous-like architecture that reduces stress concentration during bending. These hollow structures allow the material to flex more easily while maintaining strength, preventing both peeling and fracture in long-term fatigue conditions.
Solution Approach 2:
The hollow structures feature curved surfaces (circular or elliptical cross-sections) rather than sharp angles, which distributes stress more evenly during bending operations. This curvature prevents stress concentration at corners that would lead to fracture initiation in grid-shaped structures.
3Strength
If entire surface of SUS is provided as support layer, then structural integrity is maintained, but peeling occurs between film layers during bending
Solution Approach 1:
Rather than uniformly modifying the entire support layer, the invention applies hollow structures only to the bending region where stress concentration occurs during folding. The non-bending regions retain their original solid structure to maintain overall structural integrity, while the bending regions gain flexibility to prevent peeling.
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 increases the bending lifespan of the support film layer, enhances the overall ductility of flexible display panels, and increases production yields by minimizing stress concentrations and fracture risks.
Implementation Method 1
The bending region includes at least one elliptical hollow structure and a plurality of shuttle-shaped hollow structures, which are arranged periodically... reduces stress concentrations and enhances ductility
Data Source
AI summary
The present application discloses a support film layer and a flexible display panel. By periodically arranging at least one elliptical hollow structure and a plurality of shuttle-shaped hollow structures in a bending region of the support film layer, stress concentrations in the bending region can be weakened, which is beneficial to increase a bending lifespan of the support film layer. The present application can improve an overall ductility of the flexible display panel, increase a bending performance of the flexible display panel, reduce a risk of peeling and fracture between film layers, and increase production yields of products.