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Sensors 2017, 17(4), 889;

Integrated Flexible Electronic Devices Based on Passive Alignment for Physiological Measurement

Bio-Medical IT Convergence Research Division, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Korea
Department of Electronics Engineering, Incheon National University, Incheon 22012, Korea
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 14 February 2017 / Revised: 5 April 2017 / Accepted: 15 April 2017 / Published: 18 April 2017
(This article belongs to the Special Issue Flexible Electronics and Sensors)
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This study proposes a simple method of fabricating flexible electronic devices using a metal template for passive alignment between chip components and an interconnect layer, which enabled efficient alignment with high accuracy. An electrocardiogram (ECG) sensor was fabricated using 20 µm thick polyimide (PI) film as a flexible substrate to demonstrate the feasibility of the proposed method. The interconnect layer was fabricated by a two-step photolithography process and evaporation. After applying solder paste, the metal template was placed on top of the interconnect layer. The metal template had rectangular holes at the same position as the chip components on the interconnect layer. Rectangular hole sizes were designed to account for alignment tolerance of the chips. Passive alignment was performed by simply inserting the components in the holes of the template, which resulted in accurate alignment with positional tolerance of less than 10 µm based on the structural design, suggesting that our method can efficiently perform chip mounting with precision. Furthermore, a fabricated flexible ECG sensor was easily attachable to the curved skin surface and able to measure ECG signals from a human subject. These results suggest that the proposed method can be used to fabricate epidermal sensors, which are mounted on the skin to measure various physiological signals. View Full-Text
Keywords: flexible electronic device; passive alignment; electrocardiogram (ECG) sensor; interconnection flexible electronic device; passive alignment; electrocardiogram (ECG) sensor; interconnection

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Ryu, J.H.; Byun, S.; Baek, I.-B.; Lee, B.K.; Jang, W.I.; Jang, E.-H.; Kim, A.-Y.; Yu, H.Y. Integrated Flexible Electronic Devices Based on Passive Alignment for Physiological Measurement. Sensors 2017, 17, 889.

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