한국전자통신학회논문지 (The Journal of the Korea institute of electronic communication sciences)

한국전자통신학회 (Korea Institute of Electronic Communication Science)
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유기 박막 트랜지스터를 이용한 유연한 디스플레이의 게이트 드라이버용 로직 게이트 구현

Implementation of Logic Gates Using Organic Thin Film Transistor for Gate Driver of Flexible Organic Light-Emitting Diode Displays

  • 조승일 (야마가타대학교 유기 일렉트로닉스 이노베이션센터) ;
  • 미즈카미 마코토 (야마가타대학교 유기 일렉트로닉스 이노베이션센터)
  • 투고 : 2018.11.02
  • 심사 : 2019.02.15
  • 발행 : 2019.02.28
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⟨ 이전 논문 다음 논문 ⟩

초록

유기 박막 트랜지스터 (OTFT) 백플레인을 이용한 유연한 유기 발광 다이오드 (OLED) 디스플레이가 연구되고 있다. OLED 디스플레이의 구동을 위해서 게이트 드라이버가 필요하다. 저온, 저비용 및 대 면적 인쇄 프로세스를 사용하는 디스플레이 패널의 내장형 게이트 드라이버는 제조비용을 줄이고 모듈 구조를 단순화한다. 이 논문에서는 유연한 OLED 디스플레이 패널의 내장형 게이트 드라이버 제작을 위하여 OTFT를 사용한 의사 CMOS (pseudo complementary metal oxide semiconductor) 로직 게이트를 구현한다. 잉크젯 인쇄형 OTFT 및 디스플레이와 동일한 프로세스를 사용하여 유연한 플라스틱 기판 상에 의사 CMOS 로직 게이트가 설계 및 제작되며, 논리 게이트의 동작은 측정 실험에 의해 확인된다. 최대 1 kHz의 입력 신호 주파수에서 의사 CMOS 인버터의 동작 결과를 통하여 내장형 게이트 드라이버의 구현 가능성을 확인하였다.

Flexible organic light-emitting diode (OLED) displays with organic thin-film transistors (OTFTs) backplanes have been studied. A gate driver is required to drive the OLED display. The gate driver is integrated into the panel to reduce the manufacturing cost of the display panel and to simplify the module structure using fabrication methods based on low-temperature, low-cost, and large-area printing processes. In this paper, pseudo complementary metal oxide semiconductor (CMOS) logic gates are implemented using OTFTs for the gate driver integrated in the flexible OLED display. The pseudo CMOS inverter and NAND gates are designed and fabricated on a flexible plastic substrate using inkjet-printed OTFTs and the same process as the display. Moreover, the operation of the logic gates is confirmed by measurement. The measurement results show that the pseudo CMOS inverter can operate at input signal frequencies up to 1 kHz, indicating the possibility of the gate driver being integrated in the flexible OLED display.

키워드

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Fig. 1 Large-Scale Wall Display of Smart MIRAI House

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Fig. 2 Prototype of Flexible OLED Displays with the OTFT Backplane

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Fig. 3 Gate Driver Integrated in the m×n OLEDDisplay

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Fig. 4 Schematic of Inkjet-printed OTFT Structure

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Fig. 5 Transfer Characteristics of OTFT

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Fig. 6 Fabrication of pseudo CMOS logic circuits

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Fig. 7 Pseudo CMOS Inverter

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Fig. 8 Static Characteristics of Pseudo CMOS Inverter

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Fig. 9 Dynamic Characteristics of Pseudo CMOS Inverter

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Fig. 10 Pseudo CMOS NAND

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Fig. 11 Static Characteristics of Pseudo CMOS NAND

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Fig. 12 Dynamic Characteristics of Pseudo CMOS NAND

Table 1. Comparison of device specifications

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