Isotropic Conductive Adhesive Interconnect Technology in Electronics Packaging Applications

Morris, James E.; Lee, Jeahuck; Liu, J.

doi:10.1002/9781118831373.ch5

Cited by 8 publications

(1 citation statement)

References 149 publications

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“…To stabilize the electrical connection in the stretchable FCB systems, current solutions prefer to stiffen the soft substrate around the connection areas and create a permanent electrical connection between the conductive tracks and other electronic components. At present, most electrical connections in flexible and stretchable electronic systems [20,21,22,23,24,25] are based on different types of carriers established by soldering [26,27,28,29,30] and conductive adhesives [28,31,32], such as silver-filled epoxy [33], silicone adhesive and single-wall carbon nanotube conductive rubber paste [34], along with subsequent encapsulation of contact areas with the glob-top cover using polydimethylsiloxane (PDMS) rubber [35] or epoxy resin. However, such electrical connections introduce higher-modulus materials and weaken the flexibility, deformability, and mechanical behavior of the electronic assembly, compromising the electrical performance of stretchable electronics.…”

Section: Introductionmentioning

confidence: 99%

Fabric Circuit Board Connecting to Flexible Sensors or Rigid Components for Wearable Applications

Ran

Ding

et al. 2019

Sensors

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Electronic textiles demand a new family of flexible circuit boards in the construction of fiber or fiber assemblies. This paper presents a stretchable woven fabric circuit board (FCB) with permanent as well as detachable electrical connections to sensors or other wearable electronics components. The woven FCB was created by integrating conductive yarns into an elastic woven fabric. Permanent connection was designed between the conductive tracks and flexible sensors; detachable connection was achieved by the helical structure of conductive yarns wrapping around the rigid component electrode encapsulated within elastomeric layer. The developed FCB, with its connections to flexible sensors or rigid components, is porous, flexible, and capable of stretching to 30% strain. The woven FCB with permanent connection to temperature sensors has a large fatigue life of more than 10,000 cycles while maintaining constant electrical resistance due to crimped configurations of the conductive track in the elastic fabric substrate and stable contact resistance. A prototype of the FCB assembly, with independent light-emitting diodes electrically linked and mechanically supported by the woven FCB, is also demonstrated for wearable applications.

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