scholarly journals Highly Integrated Elastic Island-Structured Printed Circuit Board with Controlled Young’s Modulus for Stretchable Electronics

Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 617
Author(s):  
Duho Cho ◽  
Junhyung Kim ◽  
Pyoenggeun Jeong ◽  
Wooyoung Shim ◽  
Su Yeon Lee ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Printed Circuit Board ◽  
Young's Modulus ◽  
Circuit Board ◽  
Stretchable Electronics ◽  
Fully Integrated ◽  
Printed Circuit ◽  
Reinforcing Agent ◽  
Highly Stretchable ◽  
Levels Of Integration

A stretchable printed circuit board (PCB), which is an essential component of next-generation electronic devices, should be highly stretchable even at high levels of integration, as well as durable under repetitive stretching and patternable. Herein, an island-structured stretchable PCB composed of materials with controlled Young’s modulus and viscosity by adding a reinforcing agent or controlling the degree of crosslinking is reported. Each material was fabricated with the most effective structures through a 3D printer. The PCB was able to stretch 71.3% even when highly integrated and was patterned so that various components could be mounted. When fully integrated, the stress applied to the mounted components was reduced by 99.9% even when stretched by over 70%. Consequently, a 4 × 4 array of capacitance sensors in a stretchable keypad demonstration using our PCB was shown to work, even at 50% stretching of the PCB.

Materials for Stretchable Electronics Compliant with Printed Circuit Board Fabrication

2012 ◽  
pp. 161-185
Author(s):  
Matthias Adler ◽  
Ruth Bieringer ◽  
Thomas Schauber ◽  
Jürgen Günther
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Stretchable Electronics ◽  
Printed Circuit

Reliability and Application Scenarios of Stretchable Electronics Realized Using Printed Circuit Board Technologies

2012 ◽  
pp. 207-233 ◽  
Author(s):  
Jan Vanfleteren ◽  
Frederick Bossuyt ◽  
Thomas Löher ◽  
Yung-Yu Hsu ◽  
Mario Gonzalez ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Stretchable Electronics ◽  
Printed Circuit

scholarly journals Universal synthesis of conductive liquid network in polymers enabling elastic printed circuit board technology

2021 ◽  
Author(s):  
Jiheong Kang ◽  
Wonbeom Lee ◽  
Hyunjun Kim ◽  
Inho Kang ◽  
Hongjun Park ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Acoustic Field ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
System Level ◽  
Large Strains ◽  
Stretchable Electronics ◽  
Electronic Components ◽  
Conductive Liquid ◽  
Printed Circuit

Abstract Stretchable electronics are considered next-generation electronic devices in a broad range of emerging fields, including soft robotics1,2, biomedical devices3,4, human-machine interfaces5,6, and virtual or augmented reality devices7,8. A stretchable printed circuit board (S-PCB) is a basic conductive framework for the facile assembly of system-level stretchable electronics with various electronic components. Since an S-PCB is responsible for electrical communications between numerous electronic components, the conductive lines in S-PCB should strictly satisfy the following features: (i) metallic conductivity, (ii) constant electrical resistance during dynamic stretching, and (iii) tough interface bonding with various components9. Despite recent significant advances in intrinsically stretchable conductors10,11,12, they cannot simultaneously satisfy the above stringent requirements. Here, we present a new concept of conductive liquid network-based elastic conductors. These conductors are based on unprecedented liquid metal particles assembled network (LMPNet) and an elastomer. The unique assembled network structure and reconfigurable nature of the LMPNet conductor enabled high conductivity, high stretchability, tough adhesion, and imperceptible resistance changes under large strains, which enabled the first elastic-PCB (E-PCB) technology. We synthesized LMPNet through an acoustic field-driven cavitation event in the solid state. When an acoustic field is applied, liquid metal nanoparticles (LMPnano) are remarkably generated from original LMPs and assemble into a highly conductive particle network (LMPNet). Finally, we demonstrated a multi-layered E-PCB, in which various electronic components were integrated with tough adhesion to form a highly stretchable health monitoring system. Since our synthesis of LMPNet is universal, we could synthesize LMPNet in various polymers, including hydrogel, self-healing elastomer and photoresist and add new functions to LMPNet.

An Optimized On-Chip Boost-Type DC-DC Converter With an On-Board Inductance

2014 ◽  
Author(s):  
Paul C.-P. Chao ◽  
Ching-Hua Kuan ◽  
Jia-Wei Su
Keyword(s):  
Printed Circuit Board ◽  
High Efficiency ◽  
Rapid Development ◽  
Current Drive ◽  
Circuit Board ◽  
Electronic Products ◽  
Fully Integrated ◽  
Printed Circuit ◽  
Limited Output ◽  
On Chip

The rapid development of portable electronic products in recent years increases demands of varied displays. With resolutions of panel sizes and pixels under current drive capability improved, this study is intended for designing an inductive DC boost converter circuit for displays, which is fully integrated with IC fabrication technology [1][2]. Most of current displays employ capacitances for voltage-boosting to supply relative high-voltage biases to displays. These booster circuits are in small sizes and with high efficiency, but limited output currents, which are inadequate for some of large-sized displays. To remedy the problem, an on-board, small-sized inductor in the forms of coils in a printed circuit board (PCB) is proposed for a superior solution. This PCB-type inductor can be incorporated into the same board with other drive chips for the displays, while offering large, adequate current, as an incapable task via an on-chip coil.

Sustained Percolation in Stretched Silver Nanowire Networks for Stretchable Inter-Connection Applications

2014 ◽  
Vol 1685 ◽  
Author(s):  
Jae Sung Park ◽  
Woo Soo Kim
Keyword(s):  
Stress Concentration ◽  
Elastic Material ◽  
Printed Circuit Board ◽  
Silver Nanowire ◽  
Circuit Board ◽  
Printed Circuit ◽  
Highly Stretchable ◽  
Tensile Strains ◽  
Nanowire Networks

ABSTRACTHere we introduce a highly stretchable Printed Circuit Board (PCB) inter-connection technology achieved through the combination of flexibility allowed by the silver nanowire (AgNW)-based electrode and stretchability provided by the meander-shaped substrate. Horseshoe-shaped elastic material, polydimethylsiloxane, is used as a substrate of the AgNW conductors for relaxed stress concentration. Continuously maintained 2-D percolation of stretchable AgNW networks overcomes the usage restrictions with ordinary rigid Printed Circuit Board (PCB). The horseshoe-shaped inter-connection is physically reliable with repeated stretching/releasing processes and maintains its conductivity under tensile strains up to 20 %, allowing the durable and stretchable PCB inter-connecting applications.

scholarly journals Miura-ori enabled stretchable circuit boards

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yongkai Li ◽  
Weixuan Liu ◽  
Yang Deng ◽  
Wei Hong ◽  
Hongyu Yu
Keyword(s):  
Industrial Production ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Stretchable Electronics ◽  
Circuit Boards ◽  
Engineering Applications ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
Design And Manufacture

AbstractOrigami, an ancient form of papercraft, provides a way to develop functional structures for engineering applications. In this paper, we report an approach to design and manufacture a stretchable circuit board (SCB) with origami structures. The benefits of developable, flat-foldable, and rigid-foldable origami-based structures as SCBs are discussed, and a representative structure, Miura fold (or Miura-ori), is chosen to be investigated. Under the constraints induced by the mounted components’ dimensions, the Miura-ori structures for specific applications can be defined. We propose three methods for better fabrication, including direct folding, stiffness modification, and kirigami enhancement, to improve a planar sheet’s foldability. A wearable ECG (electrocardiogram) system based on MO-SCB (Miura-ori enabled SCB) technology is built, and the stretchable portion is made of commercial FPCBs (flexible printed circuit board), providing desired stretchability and reliability. The proposed technology routine is compatible with industrial production and may pave the application of stretchable electronics.

Transfer Printing of Stretchable Electronics on Conformal Surfaces

2015 ◽  
Author(s):  
Apoorv Sharma ◽  
Rahul Rai
Keyword(s):  
Printed Circuit Board ◽  
Structural Strength ◽  
Shape Representation ◽  
Circuit Board ◽  
Stretchable Electronics ◽  
Transfer Printing ◽  
Electronic Circuits ◽  
Fabrication Technology ◽  
Printed Circuit ◽  
Planar Surfaces

In this paper, we outline a hybrid process to print stretchable electronic circuits on non-planar surfaces. Using this process, the stretchable structures, generated using traditional printed circuit board fabrication technology can be printed on conformal surfaces using transfer printing by PDMS membranes. Three different configurations of stretchable structures for use in the circuits are also compared for their robustness of shape representation and structural strength. The application of the proposed process is illustrated through application examples.

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