Session 10: FPE Applications
All-Printing Process for Stretchable LED Matrix Display
Wednesday, June 21, 2017
10:50 AM - 11:10 AM
In this work, we present the all-screen printing process to prepare stretchable light emitting diodes (LED) matrix sheet. Silver conductive circuits and insulators were layer-by-layer printed on the polydimethylsiloxane (PDMS). Plasma pre-treatment for PDMS played a critical factor due to its natural hydrophobic properties. After the surface modification, the water contact angle of PDMS was obviously decreased. As a result, the printability and the adhesion of ink based circuits were significantly improved. The LED was well attached to the printed circuit by using the commercial soldering paste. To consolidate the LED matrix, the whole film was encapsulated with gel-typed PDMS. Integration with Arduino microcontroller, LED matrix was functioned to show the scrolling text and combined with clothing for wearable applications. This technique is expecting to be applied to variety of stretchable electronics, such as sensing device or health-care applications.
Shu-Hao Chang, received the B.S. degree from National Cheng Kung University in 2008 and the Ph. D. degree in chemical engineering from National Tsing Hua University in 2014, respectively. His research interests lie in stretchable electronics, material engineering, nanotechnology, and solar energy. Between 2011 and 2012, he was a research assistant in Green Energy and Environment Research Laboratories in ITRI, Taiwan. For the 2013-2014 academic years, Shu-Hao was a visiting scholar at the University of Michigan. Now, he works in AUO as R&D engineer for developing new fabrication process in stretchable electronics.