Flexible Supporting Layer Groove Design for Stress Management
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Solution Overview
Problem
Flexible display modules face stress accumulation during curling and unwinding, leading to potential breakage and peeling issues at the winding end, reducing their dependability.
Innovation Solution
A flexible supporting layer with adjustable modulus is applied, featuring grooves with varying densities, sizes, and depths to redistribute stress, minimizing film layer deformation and stress accumulation by adjusting the equivalent modulus in different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display module is curled and unwound, then the flexible display can achieve flexible deformation and portability, but stress accumulates at the winding end leading to breakage and peeling
Solution Approach 1:
The supporting layer is designed with non-uniform groove distribution where the groove density varies in different regions. Specifically, the groove density is higher in regions that experience greater stress during curling, and lower in regions with less stress. This local variation in groove density allows different parts of the supporting layer to have different mechanical properties, effectively distributing and reducing stress accumulation at the winding end while maintaining flexible deformation capability.
2Strength
If the supporting layer has high material content per unit volume, then the equivalent modulus increases improving stress resistance, but the flexible deformation capability decreases
Solution Approach 1:
The supporting layer employs regional differentiation in groove density to achieve local optimization of mechanical properties. Regions requiring higher strength have lower groove density (higher material content per unit volume), while regions requiring greater flexibility have higher groove density (lower material content per unit volume). This spatially varying structure allows the supporting layer to simultaneously provide stress resistance where needed and flexible deformation where required.
Solution Approach 2:
The groove density parameter is varied continuously or discretely across different regions of the supporting layer. By changing this geometric parameter, the equivalent modulus of the supporting layer is adjusted locally, creating a gradient structure that optimizes both strength and flexibility in different areas according to the stress distribution pattern during flexible deformation.
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 effectively reduces stress accumulation at the winding end, enhancing the dependability of flexible display modules by absorbing stress through controlled deformation, preventing breakage and peeling, and allowing for different deformation modes.
Implementation Method 1
The flexible supporting layer is applied in the flexible display apparatus, and in a curl direction of the flexible display apparatus, a content of a material of the flexible supporting layer per unit volume increases
Implementation Method 2
absorbing stress through controlled deformation
Data Source
AI summary
A flexible supporting layer and a flexible display device. The flexible supporting layer is applied in a flexible display device, and the content of a flexible supporting layer material per unit volume increases in the curl direction of the flexible display device.