Auxetic Stretchable Substrate Minimizing Distortion
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Solution Overview
Problem
Existing stretchable display technologies face challenges with distortion during deformation, particularly under low stress, and require a substrate that maintains mechanical stability and high transmittance while minimizing surface distortion.
Innovation Solution
A stretchable substrate is developed using a mechanical metamaterial with a negative Poisson's ratio, formed through a method that includes creating auxetic structures with specific unit structures and microstructures, which are then processed using techniques like printing and curing to achieve controlled strain and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional flexible substrate is used for stretchable displays, then the substrate can be deformed in a single direction, but distortion occurs during deformation and mechanical stability is compromised
Solution Approach 1:
The substrate is divided into rigid pattern regions and flexible matrix regions, allowing different parts to perform different functions. The rigid patterns maintain structural integrity and prevent distortion, while the flexible matrix enables multidirectional deformation
Solution Approach 2:
Different regions of the substrate are given different mechanical properties - the pattern regions have high rigidity for stability, while the matrix regions have high flexibility for deformation. This local differentiation allows the substrate to simultaneously achieve mechanical stability and deformation freedom
2Adaptability or versatility
If the substrate is made more flexible to enable stretchability, then deformation capability increases, but surface distortion and image quality deteriorate
Solution Approach 1:
The substrate structure is segmented into rigid patterns that maintain surface flatness and flexible matrix that provides stretchability. The rigid patterns act as stiffening elements that prevent surface distortion while allowing the overall substrate to stretch
Solution Approach 2:
The substrate combines rigid and flexible materials in a composite structure. The rigid pattern regions provide dimensional stability and surface flatness, while the flexible matrix regions enable stretchability, creating a composite material with optimized properties
3Ease of manufacture
If the substrate structure is simplified for easy manufacturing, then production efficiency increases, but control over strain distribution and distortion reduction decreases
Solution Approach 1:
The mechanical properties of the substrate are controlled by changing structural parameters such as pattern geometry, pattern density, and matrix thickness rather than using complex materials or processes. This allows precise control over strain distribution while maintaining manufacturing simplicity
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 minimizes surface distortion and maintains mechanical stability under external forces, enabling the stretchable substrate to support deformation in multidimensional axis directions while preserving high transmittance and resolution.
Implementation Method 1
an elastic substrate is formed to include a mechanical metamaterial with a negative Poisson's ratio and of which, when stretched in one axial direction, a strain in another axial direction is controllable
Implementation Method 2
forming a substrate part made of an elastic material
Data Source
AI summary
Provided is a method of manufacturing a stretchable substrate according to various embodiments of the present disclosure in order to implement the above-described objects. The method may include forming an auxetic including a plurality of unit structures and forming one or more microstructures.