Multi-Layer Metal Support for Flexible OLED Fracture Prevention
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Solution Overview
Problem
Flexible OLED displays face a risk of metal support fracture during bending due to stress concentration, as the elastic modulus of metal supports is significantly higher than the adhesive materials, leading to potential breakage.
Innovation Solution
A display panel design featuring a support plate with multiple layers of support members, where each layer is bonded by an adhesive, with specific hollowed-out areas and orientations to distribute stress evenly, and a mesh structure in certain areas to reduce bending stress, using materials like stainless steel or titanium alloy foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal support member is used to improve the overall supportability, tensile strength, and impact resistance of the flexible OLED display, then the structural strength is improved, but the metal support is prone to stress concentration during bending due to its high elastic modulus, resulting in fracture risk
Solution Approach 1:
The support plate is divided into multiple layers with support members arranged in different orientations. Each layer's support members are positioned at different angles (e.g., 0°, 45°, 90°) to distribute stress across multiple directions, preventing stress concentration in any single direction during bending operations.
Solution Approach 2:
The support plate uses a composite structure combining multiple metal support members with different calendered directions, bonded together by adhesive layers. This composite arrangement allows each layer to contribute to strength in different directions while the adhesive provides flexibility, creating a multi-directional load-bearing system that reduces fracture risk during bending.
2Strength
If the elastic modulus of the metal support is increased to improve supportability, then the tensile strength is improved, but the stress cannot be released in time during bending, leading to fracture
Solution Approach 1:
The support plate structure transitions from a rigid single-layer design to a multi-layer dynamic system where each layer can independently deform and absorb stress. The adhesive layers between support members allow for controlled stress distribution and release during bending, enabling the structure to adapt dynamically to bending forces while maintaining overall integrity.
3Device complexity
If a single-layer support plate is used, then the structure is simple, but the bending stress is concentrated in one direction, increasing the risk of metal support fracture
Solution Approach 1:
The solution adds the dimension of multiple layers with different orientations to the support plate structure. By stacking support members at various angles (0°, 45°, 90°) and bonding them with adhesive layers, the design distributes bending stress across multiple planes and directions, transforming a single-direction stress concentration problem into a multi-directional stress distribution system.
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
This design reduces bending stress and prevents fractures by distributing force across multiple layers and absorbing stress with adhesive deformation, allowing for flexible bending without breaking the metal support.
Implementation Method 1
a first adhesive layer arranged between the first support member and the second support member
Implementation Method 2
the first support member is hollowed out in an area corresponding to the first bending area, a second support member hollowed out in an area corresponding to the second bending area
Implementation Method 3
the first support member has a mesh shape in an area corresponding to the second bending area, and/or the second support member has a mesh shape in an area corresponding to the first bending area
Data Source
AI summary
The present application provides a display panel and an electronic device. A support plate of the display panel includes a support member stacked in multiple layers. An area of a first support member corresponding to the first bending area is hollowed out. A calendered direction of the first support member is perpendicular to a bending axis of the second bending area. An area of a second support member corresponding to the second bending area is hollowed out. A calendered direction of the second support member is perpendicular to a bending axis of the first bending area to alleviate the fracture risk of the metal support.