Composite Lower Module Structure for Foldable Display Durability
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Solution Overview
Problem
Existing flexible display devices face challenges in maintaining excellent folding properties and durability, particularly in foldable or rollable designs, due to the limitations of current display device members.
Innovation Solution
A display device design incorporating a lower module with a support layer composed of glass fiber and polymer material, featuring concave-convex patterns and a metal layer, which enhances folding properties and durability by providing structural support and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flexible display device is designed to be foldable or rollable, then portability and user convenience are improved, but mechanical properties and durability deteriorate
Solution Approach 1:
The support plate uses a composite structure combining a metal base plate with a polymer layer containing glass fibers. This composite material provides both the flexibility needed for folding and the mechanical strength required for durability, resolving the contradiction between portability and mechanical properties.
Solution Approach 2:
The support plate has different properties in different regions: the metal base plate provides overall structural strength and durability, while the polymer layer with glass fibers provides localized flexibility and reinforcement. This local differentiation allows the structure to be both foldable and mechanically robust.
2Strength
If adhesive layers are added between the metal layer and support layer, then bonding strength is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The metal layer and support layer are directly bonded to each other without an intermediate adhesive layer. This merging of the two layers simplifies the overall structure, reduces manufacturing complexity, and eliminates the need for additional adhesive materials while maintaining bonding strength through direct contact and interference fit.
Solution Approach 2:
The adhesive layer is completely removed from the structure. By extracting this intermediate layer, the design achieves simplification and reduces the number of components, while the direct bonding interface between metal and polymer layers provides sufficient bonding strength for the application.
3Manufacturing precision
If the metal layer surface is made smooth, then manufacturing precision is improved, but surface pressure-sensitive adhesion deteriorates
Solution Approach 1:
The metal layer surface has localized irregularities and roughness features that provide anchoring points for the polymer layer. These local surface variations, rather than a uniformly smooth surface, enhance pressure-sensitive adhesion while maintaining overall manufacturing precision through controlled roughness parameters.
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 provides improved folding properties and durability to the display device, ensuring mechanical stability and longevity while allowing for flexible folding and bending operations.
Implementation Method 1
a metal layer directly disposed on the first surface
Implementation Method 2
a first surface spaced apart from the display module and including a first concave-convex pattern, and a second surface facing the first surface and including a second concave-convex pattern
Data Source
AI summary
A display device includes a folding region, and a non-folding region which is adjacent to the folding region along a first direction, a display module which displays an image, a window on the display module, a lower support plate facing the window with the display module therebetween, the lower support plate including a metal material, and an upper support plate between the display module and the lower support plate. The upper support plate includes a support layer including glass fiber and a polymer material, a first surface including a first concave-convex pattern, and a second surface opposite to the first surface, closer to the display module than the first surface and including a second concave-convex pattern and a metal layer directly on the first surface of the support layer, in the non-folding region.