Foldable Display Adhesive Modulus Layout for Bend Protection
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Solution Overview
Problem
Foldable display devices face issues with the supporting layer causing staggered floor phenomena, leading to potential damage of the bending region during folding, and insufficient support affecting the bending morphology, resulting in abnormal displaying.
Innovation Solution
A foldable display device design with a first adhering layer having different elasticity moduli in its parts, where the part near the bending region has a higher modulus than the part away from it, combined with a supporting layer that can stagger more in the direction opposite to the bending region, ensuring sufficient support and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the supporting layer is made rigid to provide sufficient support, then the support strength is improved, but the bending region may be pushed and damaged during folding
Solution Approach 1:
The first adhering layer is designed with spatially varying elasticity modulus: the first region (near bending region) has lower elasticity modulus to allow deformation and prevent damage, while the second region (away from bending region) has higher elasticity modulus to provide support. This local differentiation resolves the contradiction between support strength and bending region protection.
2Shape
If the supporting layer is allowed to stagger in the direction opposite to the bending region, then the bending morphology is maintained, but the supporting effect may be insufficient
Solution Approach 1:
The first adhering layer's elasticity modulus is differentiated spatially: the first region near the bending region has lower modulus to permit staggering and maintain bending morphology, while the second region away from the bending region has higher modulus to provide sufficient supporting effect. This resolves the contradiction between maintaining bending shape and providing support.
3Ease of manufacture
If a uniform adhering layer is used, then the manufacturing process is simplified, but the elasticity modulus cannot be optimized for both support and bending protection
Solution Approach 1:
The first adhering layer is designed with different elasticity moduli in different regions to optimize both support function and bending protection. While this increases manufacturing complexity compared to a uniform layer, it enables the adhering layer to simultaneously provide sufficient support in the second region and protection in the first region during folding.
Solution Approach 2:
The first adhering layer can be constructed as a composite structure with different material compositions or densities in different regions, achieving spatially varying elasticity modulus. This allows optimization of mechanical properties for different functional requirements while maintaining a relatively simple overall structure.
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 design prevents the bending region from being pushed and damaged by the supporting layer, maintaining the bending morphology and ensuring normal display functionality.
Implementation Method 1
an elasticity modulus of the second adhering part is greater than an elasticity modulus of the first adhering part
Data Source
AI summary
The foldable display device is provided with a display panel, a first adhering layer and a supporting layer, the first adhering layer includes a first adhering part and a second adhering part, the first adhering part is disposed on one side of the second adhering part. The one side of the second adhering part is away from the bending region, and an elasticity modulus of the second adhering part is greater than an elasticity modulus of the first adhering part. The elasticity modulus of the second adhering part, which is close to the bending region, is set to be greater than the elasticity modulus of the first adhering part, which is away from the bending region. When the foldable display device is in the folding state, the supporting layer may appear staggered floor in the direction opposite to the bending region of the display panel to a larger extent.