Stretchable Display Island-Connection Stress Distribution
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Solution Overview
Problem
Current stretchable display apparatuses face challenges in maintaining durability and preventing abnormal transformation under tensile and contraction forces due to stress concentration at connection points, leading to potential damage and reduced lifespan.
Innovation Solution
A stretchable display apparatus design featuring island regions and connection regions with specific structural features, including step differences in substrate and insulating layers, which distribute stress and enhance durability by reducing strain at connection points through optimized layer thickness and concave portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection region is designed to connect island regions, then electrical connectivity is achieved, but stress concentration occurs leading to reduced durability
Solution Approach 1:
The connection region is designed with non-uniform thickness, featuring a first portion with greater thickness adjacent to the island region and a second portion with lesser thickness extending away from it. This local variation in thickness distributes stress more effectively throughout the connection region, preventing stress concentration at specific points while maintaining electrical connectivity between island regions.
2Stress or pressure
If the connection region has uniform thickness, then manufacturing is simplified, but stress distributes poorly under tensile and contraction forces
Solution Approach 1:
The substrate and insulating layers are configured with varying thicknesses in the connection region, creating a gradient structure that optimizes stress distribution. The first portion adjacent to the island region has greater thickness to provide structural support, while the second portion has lesser thickness to reduce stress concentration, achieving superior mechanical performance despite increased manufacturing complexity.
3Stability of the object's composition
If the insulating layer has constant thickness, then fabrication is easier, but abnormal transformation occurs under mechanical stress
Solution Approach 1:
The insulating layer is designed with a thickness gradient, having a first portion with greater thickness adjacent to the island region and a second portion with lesser thickness extending toward the connection region. This local variation in thickness prevents abnormal transformation under tensile and contraction forces by distributing mechanical stress evenly, while maintaining the necessary insulating properties throughout the structure.
Data Source
AI summary
A stretchable display apparatus includes a substrate including two island regions and a connection region, wherein the two island regions are located apart from each other and the connection region connects the two island regions to each other, sub-pixel circuits arranged in the two island regions, light-emitting diodes arranged in the two island regions and electrically connected to the sub-pixel circuits, a wiring arranged in the connection region and electrically connected to the sub-pixel circuit arranged in a first island region which is one of the two island regions, and an insulating layer on the wiring, wherein at least one of the connection region of the substrate and the insulating layer includes a step difference.