Foldable Display Support Layer With Graded Modulus for Stress Control
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Solution Overview
Problem
Foldable display devices require increased flexibility and resistance to external impact while maintaining surface quality, as they are vulnerable to deformation due to stress during folding and unfolding.
Innovation Solution
A foldable display device with a support layer featuring a pattern portion that includes areas with different moduli and auxetic structures, providing enhanced flexibility and impact resistance by distributing stress evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the foldable display device uses a uniform support layer structure, then the manufacturing process is simple, but the device is vulnerable to deformation and has poor impact resistance
Solution Approach 1:
The support layer is divided into multiple regions with different moduli: a first region with a first modulus, a second region with a second modulus greater than the first, and a third region with a third modulus greater than the second. This local quality variation allows different parts of the support layer to provide different levels of support, improving overall impact resistance while managing stress distribution during folding.
Solution Approach 2:
The support layer employs a composite structure with multiple regions having different mechanical properties (moduli). This composite approach combines materials or structures with varying stiffness characteristics to achieve both flexibility in the folding area and rigidity in non-folding areas, thereby improving impact resistance without uniform complexity.
2Ease of operation
If the support layer has high flexibility to facilitate folding, then the device can be folded easily, but the surface quality degrades when folded
Solution Approach 1:
The support layer provides different levels of support in different regions: the first region (with lower modulus) allows flexibility for folding operations, while the second and third regions (with higher moduli) maintain surface quality and prevent degradation. This localized property variation resolves the contradiction between folding ease and surface quality.
3Stability of the object's composition
If the support layer has uniform modulus throughout, then the structure is simple, but stress is not distributed evenly causing deformation
Solution Approach 1:
The support layer is designed with three regions having progressively different moduli to optimize stress distribution. The first region (lower modulus) absorbs and distributes stress during folding, while the second and third regions (higher moduli) provide structural stability. This graduated modulus approach ensures even stress distribution while maintaining manageable structural complexity.
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 support layer with auxetic patterns and varying moduli enhances the device's flexibility and impact resistance, preventing deformation and maintaining surface quality during folding and unfolding.
Implementation Method 1
A foldable display device with a support layer featuring a pattern portion that includes areas with different moduli and auxetic structures, providing enhanced flexibility and impact resistance by distributing stress evenly.
Implementation Method 2
providing enhanced flexibility and impact resistance by distributing stress evenly
Implementation Method 3
The support layer includes a first area having a first modulus, and a second area disposed on at least one side of the first area and having a second modulus different from the first modulus
Data Source
AI summary
A foldable display device including a display panel including a folding area and a non-folding area adjacent to at least one side of the folding area. A support layer is disposed on the display panel. The support layer includes a pattern portion overlapping the folding area. The pattern portion includes a first area having a first modulus, and a second area disposed on at least one side of the first area and having a second modulus different from the first modulus.