Laminated Stretchable Resin Sheet Structure for Flexible Displays
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Solution Overview
Problem
Conventional flexible display devices and electronic components face limitations in stretchability and durability due to the lack of multi-axial stretchability and high residual stress, leading to breakage when deformation exceeds the material's limits, and existing materials struggle to maintain adhesion and heat resistance.
Innovation Solution
A sheet-shaped stretchable structure composed of laminated stretchable resin sheets with hollows between them, using thermosetting resin such as epoxy resin, which provides high tensile stress relaxation properties and excellent restoration capabilities, allowing for multi-axial deformation and reduced residual strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional flexible resin materials are used, then flexibility is improved, but stretchability and durability deteriorate due to high residual stress and breakage when deformation exceeds material limits
Solution Approach 1:
The structure is divided into multiple laminated stretchable resin sheets with hollows between them, allowing each layer to deform independently and reducing residual stress accumulation, thereby maintaining durability during large deformations
Solution Approach 2:
The patent uses multiple thin stretchable resin sheets instead of a single thick material, enabling the structure to bend and stretch more effectively while maintaining flexibility and reducing breakage risk
2Ease of manufacture
If single-layer resin structure is used, then manufacturing simplicity is maintained, but adhesion and heat resistance deteriorate
Solution Approach 1:
The patent employs laminated stretchable resin sheets forming a composite structure that combines multiple materials with complementary properties, achieving superior adhesion and heat resistance while remaining manufacturable through lamination processes
3Adaptability or versatility
If material stretchability is increased to accommodate large deformation, then extensibility is improved, but residual strain increases leading to poor restoration properties
Solution Approach 1:
Dividing the structure into multiple laminated sheets with hollows allows each layer to stretch independently to high extents while the segmented architecture prevents residual strain accumulation, enabling excellent restoration properties after large deformations
Solution Approach 2:
The hollows create a porous structure between laminated sheets that allows the material to expand and contract more freely during stretching, reducing residual strain and improving restoration capability
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 structure achieves significant stretchability (up to 500%) with minimal residual strain, maintaining adhesion and heat resistance, enabling flexible display devices to fit curved surfaces and accommodate large deformations without breakage.
Implementation Method 1
a sheet-shaped stretchable structure with a high level of tensile stress relaxation properties and excellent restoration properties after extension
Implementation Method 2
excellent restoration properties after extension
Data Source
AI summary
A sheet-shaped stretchable structure including stretchable resin sheets laminated together is provided. A conductive layer may be disposed at least at one of several positions. For example, the conductive layer may be disposed between any two adjacent ones of the laminated stretchable resin sheets. The conductive layer may be disposed on a top surface of an uppermost one of the laminated stretchable resin sheets. Further, the conductive layer may be disposed on a bottom surface of a lowermost one of the laminated stretchable resin sheets, and a via hole.