Flexible Display Edge Alignment for Bending Crack Prevention
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Solution Overview
Problem
Flexible display devices are prone to structural fractures due to bending stress, which reduces their service life and causes damage to internal components.
Innovation Solution
A flexible display device design featuring a base film, a display panel, a protective film, and an adhesive layer with a specific thickness and Young's modulus range, where the adhesive layer overlaps with the protective film, and a laser cutting process aligns the edges to minimize stress and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If components and film layers are made with certain hardness and brittleness properties, then structural strength is improved, but bending stress causes structural fracture and internal component damage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the adhesive layer's thickness (10-500 μm) and Young's modulus (0.1-10 GPa) to optimize the balance between structural strength and bending flexibility. This parameter optimization allows the display device to maintain structural integrity while reducing brittleness-induced fractures during flexing operations
Solution Approach 2:
The patent employs composite materials through the multi-layer structure comprising base film, display panel, protective film, and adhesive layer. This composite design combines materials with different mechanical properties to achieve both strength and flexibility, preventing structural fracture while maintaining structural support
2Strength
If the adhesive layer thickness is increased, then bonding strength is improved, but device thickness and complexity increase
Solution Approach 1:
The patent optimizes the adhesive layer thickness parameter within the range of 10-500 μm to achieve sufficient bonding strength without excessive thickness. This parameter control ensures strong adhesion between layers while maintaining a thin overall device profile and simplifying the structural design
3Ease of manufacture
If the protective film area is reduced, then manufacturing costs are optimized, but coverage and protection are compromised
Solution Approach 1:
The patent applies local quality by making the protective film area less than the display panel area, providing targeted protection where most needed while reducing material usage and manufacturing costs in less critical areas. This selective coverage approach optimizes both cost and protection effectiveness
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 reduces adverse effects of bending stress, prolongs the service life of flexible display devices by protecting internal components and preventing micro cracks, while also optimizing manufacturing costs and screen-to-body ratios.
Implementation Method 1
A thickness of the adhesive layer is between 10 μm and 500 μm. A Young's modulus of the adhesive layer is between 0.1 GPa and 10 GPa
Implementation Method 2
The adhesive layer and the protective film include an overlapping portion... reduces adverse effects of the bending stress on flexible display devices
Implementation Method 3
A laser cutting process is performed to make a side edge of the base film, a side edge of the display panel, and a side edge of the adhesive layer substantially aligned
Data Source
AI summary
A flexible display device includes a base film, a display panel on the base film, a protective film on a surface of the display panel away from the base film, and an adhesive layer. An area of the protective film is less than that of the display panel. The adhesive layer and the protective film has an overlapping portion. The adhesive layer has a thickness and Young's modulus between 10 and 500 μm and between 0.1 and 10 GPa, respectively. A side edge of the base film, a side edge of the display panel, and a side edge of the adhesive layer are substantially aligned.