KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia

Low-Power Capacitive Pressure Sensor Circuit Based on Coplanar a-IGZO TFTs Using Photo-Patternable Ionic Polymer Gate Dielectric

Heejoo Park, Yongchan Kim, Changhyeon Cho, and Hojin Lee

Abstract

Pressure sensor circuits based on thin-film transistors (TFTs) have emerged as promising candidates for future technologies such as human-machine interfaces, wearable health monitoring, and electronic skins. To be utilized in the future sensing system, high performance and low-operating voltage are essential factors, and, in this regard, ionic polymer electrolytes have attracted considerable attention as gate dielectric of TFT to give superior advantages including exhibit high capacitance, excellent mechanical flexibility, and optical transparency. However, most approaches for patterning ionic polymer electrolyte such as transfer or nozzle-based printing methods often suffer from low spatial resolution and inaccurate fine pattern control.

KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia

Electromagnetic Wave Focusing Metasurface based Novel Wireless Power Transfer System for Bio-Implantable Device

Semin Jo, Wonwoo Lee, and Hojin Lee

Abstract

  Implantable devices require miniaturization, stability, and long-term operation characteristics for monitoring and stimulation within the tissue. Generally, batteries have been used in the implantable device for long-term operation ability. However, implantable devices using batteries have limitations such as large size, short lifetime, and periodical replacement surgery. Therefore, wireless power transfer (WPT) system has been reported as alternative method to long-term operation of implantable devices. Recently, WPT systems based on metasurfaces, that exhibit exotic electromagnetic (EM) characteristics with sub-wavelength thickness, were introduced in bioelectronics to improve the efficiency and to reduce the geometrical dimension of WPT system.

KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia

Design of Orthogonal Polymer Semiconductor Gels for High Physical and Chemical Resistance

Ryungyu Lee, Keun-Yeong Choi, Han Wool Park, and Do Hwan Kim, Hojin Lee

Abstract

  Presently commercialized organic light-emitting diode (OLED) displays have limitations in implementing future high-resolution displays as fine metal mask (FMM) methods are commonly utilized to implement pixel patterns. To this end, lots of research have been done through printing methodology including inkjet printing, screen printing, and organic vapor jet printing to implement high-resolution OLED pixel array. However, the printing process suffers from critical problems associated with cross contamination, pattern uniformity, and deterioration of unique physical/photoelectric characteristics during the sequential process of pixel formation. In this regard, light-emitting organic semiconductor as a core material of OLED requires physical and chemical resistance to improve durability. In this work, we propose an OLED with differentiated technologies by implementing orthogonal polymer semiconductor gel (OPSG) conversion technology that is durable against external stimuli and maintain intrinsic photoelectric propose.

KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia

Wireless-Powered VOCs Sensor Based on Energy-Harvesting Metamaterial

Hojin Lee

Abstract

  Metamaterials, that can manipulate the electromagnetic (EM) waves and induce unique electromagnetic properties, have been explored as novel sensing platforms having superior sensing capabilities including high sensitivity, rapid sensing response, and high sensitivity owing to their high-quality resonance characteristics. However, most metamaterial-based gas sensor systems require bulky and complicated measurement system that limits real-time application.

SID Display Week 2022, San Jose, USA

May 9 - May 13, 2022 (Mon. - Fri.), McEnery Convention Center