Foldable Display Support Assembly With Stress-Relief Hole Pattern
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Solution Overview
Problem
The multi-layer stacked structure of foldable-screen devices experiences internal stresses during bending, leading to structural peeling and damage due to deformation and interaction between layers, which compromises the reliability of the display module.
Innovation Solution
A support assembly with strategically placed holes in the support plate and substrate, reducing internal stresses by allowing for material deformation and minimizing stress transfer to adjacent layers, thereby preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the display module uses a multi-layer stacked structure with adhesive layers to attach support plate, substrate, display panel and protection layers, then the structural integrity and attachment strength are improved, but internal stresses generated during bending cause structural peeling and damage between layers
Solution Approach 1:
The support plate is divided into a first region and a second region with different structural characteristics. The first region has through-holes penetrating the support plate to reduce internal stress, while the second region maintains a complete structure for strong attachment. This segmentation allows different parts of the support plate to serve different functions: stress reduction in the bending area and structural integrity in the attachment area.
Solution Approach 2:
Different regions of the support plate are designed with different local qualities. The first region (bending region) has through-holes to reduce internal stress and allow deformation, while the second region (attachment region) has a complete structure without holes to provide strong attachment strength. This local differentiation resolves the contradiction between needing stress relief during bending and maintaining attachment integrity.
2Strength
If the support plate and substrate are made solid without holes to maintain structural strength, then attachment strength is improved, but internal stress during bending increases causing peeling and damage
Solution Approach 1:
The support plate is segmented into regions with different hole configurations. The first region has through-holes that penetrate the support plate to reduce internal stress during bending, while the second region remains solid to maintain structural strength. This segmentation allows the structure to simultaneously achieve stress reduction and strength maintenance in different areas.
Solution Approach 2:
The support plate incorporates a porous structure with through-holes in the first region. These holes reduce the material density and allow the structure to deform more easily during bending, thereby reducing internal stress. The porous design in the bending region complements the solid structure in the attachment region to achieve both stress reduction and strength maintenance.
3Stress or pressure
If holes are formed in all layers including adhesive layers to reduce internal stress, then stress reduction effect is improved, but manufacturing complexity and processing difficulty increase
Solution Approach 1:
The hole configuration is segmented across different layers. Through-holes are formed only in the support plate and substrate, which are rigid layers easier to process. The adhesive layers maintain their complete structure without holes, simplifying the manufacturing process. This segmentation of hole placement reduces processing difficulty while still achieving stress reduction in the critical bending regions.
Solution Approach 2:
The support plate and substrate act as intermediary structures that bear the through-holes for stress reduction. The adhesive layers, which are more difficult to process with holes, are kept intact. The intermediary rigid layers absorb the complexity of hole formation, protecting the more delicate adhesive layers from processing complexity.
Data Source
AI summary
A support assembly includes a support plate, a first adhesive layer, a substrate, and a second adhesive layer. The support plate, the first adhesive layer, the substrate, and the second adhesive layer are stacked from the bottom up. The substrate is attached to the support plate by using the first adhesive layer, and the support assembly is configured to attach to another structure by using the second adhesive layer, thereby forming a display module of a foldable-screen device. The support assembly includes a bendable region; the support assembly is configured to bend in the bendable region; the support assembly is provided with a plurality of first holes in the bendable region; and the plurality of first holes penetrate through at least the support plate and the substrate in a stacking direction of the support plate, the first adhesive layer, the substrate, and the second adhesive layer.