Meandering Graphene Wiring for Stretchable Flexible Electronics
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Solution Overview
Problem
Flexible electronic devices face disconnection issues due to uneven stress distribution when stretched or bent, particularly at areas with maximum stress, limiting their adaptability and reliability.
Innovation Solution
The device incorporates a structure with meandering graphene wirings on organic insulating films, connected by metal wires, where graphene is formed on the surface of polyimide films to enhance stretchability and prevent disconnections by distributing stress more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scanning lines and signal lines are made in meander wiring structure, then adaptability to stretching and bending is improved, but non-uniform stress distribution causes disconnection at maximum stress portions
Solution Approach 1:
The patent applies local quality by making the insulating film thickness non-uniform: thicker at portions corresponding to maximum stress locations and thinner at other portions. This localized variation in insulating film thickness specifically addresses high-stress areas to prevent disconnection, while maintaining meander structure adaptability in lower-stress regions.
Solution Approach 2:
The patent uses a composite structure combining organic insulating films with specific thickness variations and meander wiring patterns. This composite approach integrates the flexibility of meander structures with the stress-distribution benefit of variable thickness insulating layers, resolving the contradiction between adaptability and reliability.
2Reliability
If insulating film thickness is increased uniformly, then stress distribution is improved, but device flexibility and stretchability are reduced
Solution Approach 1:
The patent implements local quality by varying the insulating film thickness locally rather than uniformly. The film is thicker only at specific high-stress portions and thinner elsewhere, providing stress distribution benefits where needed while preserving overall device flexibility and stretchability.
Solution Approach 2:
The patent changes the thickness parameter of the insulating film from a constant value to a spatially varying value. This parameter change allows the film to provide stress distribution where needed while maintaining flexibility in other regions, resolving the contradiction between reliability and adaptability.
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 configuration significantly improves the device's ability to stretch and bend without breaking, achieving high elongation ratios and maintaining reliability by integrating graphene with metal wires for enhanced mechanical stability.
Implementation Method 1
graphene being formed on a surface of the first organic insulating film to form a first wiring... to distribute stress uniformly and enhance flexibility and durability
Data Source
AI summary
The purpose of the invention is to realize a flexible electronic device of high reliability. The present invention takes a following structure to realize the purpose. An electronic device including: a plurality of element areas, arrayed in a first direction with a first distance, and arrayed in a second direction with a second distance, the plurality of element areas being connected with each other in the first direction by a first organic insulating film, which meanderingly extends in the first direction, graphene being formed on a surface of the first organic insulating film to form a first wiring, the plurality of element areas being connected with each other in the second direction by a second organic insulating film, which meanderingly extends in the second direction, graphene being formed on a surface of the second organic insulating film to form a second wiring.