Investigation on fracture and conductivity of flex-on-film flexible bonding using anisotropic conductive film considering repeated bending

Chao Ming Lin, Dyi-Cheng Chen, Yen Chun Liu

Research output: Contribution to journalArticle

Abstract

This study conducts an experimental investigation into the bending behavior and electrical resistance properties of Flex (PI with Cu)-On-Film (ITO–coated PET) packages considering the flexible effects under static bending loads with sequential bending cycles. The FOF packages, consisting of flex (with fine-pitch Cu circuits) and film (ITO–coated PET plastic) are bonded by Anisotropic Conductive Film (ACF). During the ACF bonding process, the deformed conductive particles in the adhesive matrix between the Cu electrodes and the ITO film under the effects of the compression force, and these broken conductive particles will play an electrical conductive role. In the subsequent bending tests (loading &unloading with many cycles), the conductive particles experience a compression or tension stress, which causes a further propagation of the cracks formed in the original packaging process. The results show the measured electrical resistance in the specified conductive channel increases with the bending cycles increasing, and the microscopic observations show that the higher electrical resistance is the result of a smaller overall contact area between the conductive ACF particles and the Cu electrode/ITO film due to fatigue crumbling of the particles.

Original languageEnglish
Pages (from-to)3017-3026
Number of pages10
JournalMicrosystem Technologies
Volume25
Issue number8
DOIs
Publication statusPublished - 2019 Aug 1

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Conductive films
Acoustic impedance
conductivity
electrical resistance
Electrodes
ITO (semiconductors)
Bending tests
cycles
Unloading
Adhesives
Packaging
Compaction
Fatigue of materials
Plastics
Cracks
electrodes
unloading
Networks (circuits)
packaging
adhesives

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

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abstract = "This study conducts an experimental investigation into the bending behavior and electrical resistance properties of Flex (PI with Cu)-On-Film (ITO–coated PET) packages considering the flexible effects under static bending loads with sequential bending cycles. The FOF packages, consisting of flex (with fine-pitch Cu circuits) and film (ITO–coated PET plastic) are bonded by Anisotropic Conductive Film (ACF). During the ACF bonding process, the deformed conductive particles in the adhesive matrix between the Cu electrodes and the ITO film under the effects of the compression force, and these broken conductive particles will play an electrical conductive role. In the subsequent bending tests (loading &unloading with many cycles), the conductive particles experience a compression or tension stress, which causes a further propagation of the cracks formed in the original packaging process. The results show the measured electrical resistance in the specified conductive channel increases with the bending cycles increasing, and the microscopic observations show that the higher electrical resistance is the result of a smaller overall contact area between the conductive ACF particles and the Cu electrode/ITO film due to fatigue crumbling of the particles.",
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Investigation on fracture and conductivity of flex-on-film flexible bonding using anisotropic conductive film considering repeated bending. / Lin, Chao Ming; Chen, Dyi-Cheng; Liu, Yen Chun.

In: Microsystem Technologies, Vol. 25, No. 8, 01.08.2019, p. 3017-3026.

Research output: Contribution to journalArticle

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