Flexible Display Edge Structure for Bending Stress Relief
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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 micro-cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible display device is bent or flexured, then the device can achieve flexible display function, but structural fracture may be generated due to bending stress
Solution Approach 1:
The patent introduces a buffer layer between the display panel and base film that proactively absorbs and dissipates bending stress before it reaches the display panel. This cushioning structure is designed in advance to mitigate the harmful effects of flexure, allowing the device to maintain structural integrity while achieving flexible display functionality.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers including base film, buffer layer, display panel, protective film, and adhesive layer. Each layer is made of specific materials with different mechanical properties that work together to balance flexibility and strength, resolving the contradiction between adaptability and reliability.
2Strength
If adhesive layer thickness is increased to improve bonding strength, then bonding between layers is enhanced, but device thickness and complexity increase
Solution Approach 1:
The patent specifies precise parameter ranges for the adhesive layer, including thickness of 10-500 μm and Young's modulus of 0.1-10 GPa. By optimizing these parameters, the adhesive layer achieves sufficient bonding strength while maintaining minimal thickness, thus improving strength without significantly increasing device complexity.
3Area of stationary object
If protective film area is reduced to optimize screen-to-body ratio, then display area is increased, but edge protection is compromised
Solution Approach 1:
The patent implements local quality by having the protective film cover only the central display area while the adhesive layer extends to the edges. This localized protection strategy ensures that the protective film provides adequate protection where needed (display area) while allowing the adhesive layer to provide edge protection and stress distribution at the boundaries, thus optimizing screen-to-body ratio without compromising overall reliability.
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-crack formation, while also optimizing manufacturing costs and screen-to-body ratios.
Implementation Method 1
A Young's modulus of the adhesive layer is between 0.1 GPa and 10 GPa
Implementation Method 2
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 base film is substantially identical to that of the display panel. An area of the protective film is less than that of the display panel. The adhesive layer is located on the surface of the display panel away from the base film. The adhesive layer and the protective film include 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. A manufacturing method of a flexible display device is also provided.