Stretchable Substrate Spatial Crosslinking Uniformity
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Solution Overview
Problem
Stretchable substrates with auxetic structures face nonuniform thickness deformation during stretching, leading to stress concentration and image distortion in displays, due to the Poisson effect and mechanical properties of the matrix and auxetic parts, which affects mechanical reliability and image quality.
Innovation Solution
A method to control the spatial crosslinking degree of the matrix by varying the crosslinking agent penetration depth in different regions, combined with a stress dissipation layer made of an elastomer material, to achieve uniform thickness deformation and distribute stress evenly across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an auxetic structure is used to achieve negative Poisson's ratio for stretchable display, then the substrate can be stretched in multiple directions, but nonuniform stress distribution and thickness deformation occur in different regions
Solution Approach 1:
The patent applies local quality by creating regions with different crosslinking degrees within the matrix. Specifically, a first region with a first crosslinking degree and a second region with a second crosslinking degree are formed to compensate for nonuniform stress distribution. This allows different parts of the substrate to have different mechanical properties, ensuring uniform thickness deformation overall while maintaining the auxetic structure's multi-directional stretchability.
2Ease of manufacture
If the matrix crosslinking is uniform across the substrate, then the manufacturing process is simple, but stress concentration occurs in specific regions during stretching
Solution Approach 1:
The patent implements local quality by forming regions with different crosslinking degrees in the matrix. A first region has a first crosslinking degree and a second region has a second crosslinking degree, allowing stress distribution to be optimized in different areas. This improves mechanical reliability under stress while maintaining reasonable manufacturing complexity through controlled spatial variation.
3Ease of operation
If the auxetic structure is stretched based on an external stress application point, then the substrate can be deformed, but stress distribution becomes nonuniform for each pixel section
Solution Approach 1:
The patent addresses stress distribution nonuniformity by creating regions with different crosslinking degrees. The first region with a first crosslinking degree and the second region with a second crosslinking degree are strategically formed to compensate for the nonuniform stress field generated during deformation. This ensures more uniform stress distribution across pixel sections while preserving the substrate's deformability.
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 approach ensures uniform thickness deformation and improved mechanical reliability by dispersing stress concentration, enhancing image quality and stability of stretchable displays.
Implementation Method 1
control of spatial crosslinking degree of a matrix
Implementation Method 2
a stress dissipation layer made of an elastomer material, to achieve uniform thickness deformation and distribute stress evenly
Implementation Method 3
due to the Poisson effect and mechanical properties of the matrix and auxetic parts
Data Source
AI summary
Provided is a method of manufacturing a stretchable substrate having improved thickness deformation uniformity through control of a spatial crosslinking degree according to various embodiments of the present disclosure to implement the above object. The method includes forming a substrate part of an elastic material, forming an auxetic including a plurality of unit structures on the substrate part, and forming a fixing part on the substrate part on which the auxetic is formed, wherein the fixing part has a different vertical crosslinking density at each position.