Stretchable Display Adhesive Layout for Island Boundary Stress
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Solution Overview
Problem
Stretchable display devices face stress concentration issues at the boundaries of island substrates when stretched, leading to potential separation and damage to connecting lines.
Innovation Solution
The implementation of an adhesive layer that overlaps the boundaries of island substrates and is configured as a multi-layer between lower patterns, effectively bonding the rigid and flexible components and reducing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer is disposed to overlap the boundaries of island substrates, then stress concentration on the boundaries is minimized, but device complexity increases due to additional multi-layer adhesive structure
Solution Approach 1:
The adhesive layer is applied selectively at the boundaries of island substrates rather than uniformly across the entire substrate. This localized application targets the specific regions where stress concentration occurs during stretching, providing enhanced stress resistance precisely where needed while avoiding unnecessary complexity in non-critical areas.
Solution Approach 2:
The adhesive layer is configured as a multi-layer structure with different adhesive layers having distinct properties. This composite approach allows each layer to address specific stress conditions and bonding requirements, optimizing the overall stress resistance while managing the complexity through functional differentiation of layers.
2Strength
If a multi-layer adhesive structure is used between lower patterns, then adhesive strength is improved, but manufacturing complexity increases
Solution Approach 1:
The multi-layer adhesive structure utilizes layers with different material parameters and properties to achieve enhanced adhesive strength. By varying the characteristics of each adhesive layer, the structure optimizes bonding performance while the systematic arrangement of layers with different properties manages the manufacturing complexity.
3Reliability
If adhesive layer is disposed under connecting lines, then stress on connecting lines is minimized, but device complexity increases
Solution Approach 1:
The adhesive layer is strategically positioned underneath connecting lines at locations where stress concentration is most likely to occur during stretching. This localized placement provides targeted protection to the connecting lines, enhancing their reliability while minimizing the overall adhesive layer configuration to only where it is most needed.
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
This solution minimizes stress on island substrates and connecting lines during stretching, reducing the likelihood of separation and damage, and enhancing the overall reliability of the stretchable display device.
Implementation Method 1
an adhesive layer that overlaps the boundaries of island substrates and is configured as a multi-layer between lower patterns, effectively bonding the rigid and flexible components and reducing stress concentration
Data Source
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AI summary
Provided is a stretchable display device (500). The stretchable display device includes a plurality of island substrates (111) in which a plurality of pixels (PX) is defined and that is spaced apart from each other; a lower substrate (510) disposed under the plurality of island substrates and including a plurality of grooves; a plurality of connecting lines (180) electrically connecting pads disposed on adjacent island substrates of the plurality of island substrates; and a lower adhesive layer (519) disposed under the plurality of island substrates and the plurality of connecting lines, in which the lower adhesive layer may be disposed to overlap boundaries of the plurality of island substrates.