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SID Display Week 2022, San Jose, USA

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


SID 윤.jpg


Low-Power a-IGZO TFT Shift Register Featuring i-PUA Gate Dielectric

Eseudeo Yun, Yongchan Kim, Hanbin Choi, Dukhyun Choi, Do Hwan Kim, and Hojin Lee


Abstract


  A low-power shift register circuit based on coplanar a-IGZO TFTs using photo-patternable micron-sized i-PUA is proposed for next-generation display. We confirmed that the fabricated shift register circuit consisting of six coplanar a-IGZO TFTs and one capacitor successfully operates with low-power driving within 3 V at various frequencies.

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SID Display Week 2022, San Jose, USA

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


SID 문.jpg


Adaptive Frequency Driving Scan Driver with NOR Logic Gate Based on a-InGaZnO TFTs

Jinho Moon, Eseudeo Yun, Yongchan Kim, Kwun-Bum Chung, and Hojin Lee


Abstract


  A scan driver combined with NOR Logic gate using amorphous indium-gallium-zinc-oxide (a-InGaZnO) thin-film transistors (TFTs) is proposed. NOR logic gate masks the output signal from the scan driver in order to control the driving frequency. Proposed frequency adaptive scan driver is expected to reduce power consumption depending on the display contents.



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KIEEME 2021, Pyeongchang, Korea

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



KakaoTalk_20210719_204410769_01.jpg
































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.

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KIEEME 2021, Pyeongchang, Korea

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



KakaoTalk_20210712_142845874.jpg





































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.

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KIEEME 2021, Pyeongchang, Korea

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


KakaoTalk_20210712_135702211_07.jpg






































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.

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