Stretchable Display Bridge Structure With Zoned Stiffness
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Solution Overview
Problem
Stretchable display substrates face issues with stress concentration and potential fracture when stretched due to uniform stiffness across bridge regions, leading to possible signal line breakage and disruption in display functionality.
Innovation Solution
The display substrate design incorporates a first region with lower stiffness and thickness compared to adjacent second regions, with a structured thickness gradient and inorganic insulating layer thickness variations to facilitate deformation and reduce stress concentration, thereby minimizing the risk of fracture during stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bridge region has uniform stiffness and thickness, then the manufacturing process is simple, but stress concentration occurs during stretching leading to potential fracture
Solution Approach 1:
The bridge region is divided into different zones with varying thickness: a first region with smaller thickness and a second region with larger thickness. This local quality variation allows the thinner first region to absorb stress during stretching, preventing fracture in the overall bridge structure while maintaining manufacturing feasibility through controlled thickness modulation.
Solution Approach 2:
The thickness parameter of the bridge region is changed spatially, creating a gradient structure where the thickness transitions from the first region (smaller thickness) to the second region (larger thickness). This parameter change optimizes the stress distribution during stretching, enhancing reliability without significantly complicating the manufacturing process.
2Strength
If the bridge region has larger thickness throughout, then structural strength is improved, but deformation capability during stretching is reduced
Solution Approach 1:
Different regions of the bridge are assigned different thickness qualities: the first region has smaller thickness to enable deformation and stress absorption, while the second region has larger thickness to maintain structural strength. This local differentiation resolves the contradiction between strength and deformability.
Solution Approach 2:
The bridge region is segmented into multiple functional zones (first region and second region) with distinct thickness characteristics. The first region serves as a flexible, stress-absorbing zone, while the second region provides structural support, achieving both deformation capability and strength simultaneously.
3Adaptability or versatility
If the bridge region has smaller thickness throughout, then deformation capability during stretching is improved, but structural strength is reduced
Solution Approach 1:
The bridge structure incorporates local quality variations where the first region has smaller thickness for deformation capability and the second region has larger thickness for structural strength. This spatial differentiation of thickness quality allows the structure to simultaneously achieve both deformation capability and adequate strength.
Solution Approach 2:
The bridge is segmented into functional zones with different thickness characteristics. The first region (thinner) provides deformation capability while the second region (thinner) provides structural support, allowing the overall structure to achieve both deformation capability and strength through proper zonal design.
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 design effectively reduces the likelihood of fracture in the second regions by allowing the first region to absorb more stress, ensuring the display panel's integrity and functionality during stretching.
Implementation Method 1
A stiffness of a portion of the display substrate located in the first region is less than a stiffness of a portion of the display substrate located in each second region... effectively reduces the likelihood of fracture in the second regions by allowing the first region to absorb more stress
Data Source
AI summary
A display substrate has a plurality of pixel island regions arranged at intervals and a plurality of bridge regions connecting the plurality of pixel island regions, and includes an opening being disposed between any two adjacent bridge regions. At least one bridge region of the plurality of bridge regions including a first region and two second regions located on two sides of the first region, one second region of the two second regions being connected to one pixel island region adjacent thereto, and another region of the two second regions being connected to one pixel island region adjacent thereto. A stiffness of a portion of the display substrate located in the first region being less than a stiffness of a portion of the display substrate located in each second region.