Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Recent Research Trends in Touchscreen Readout Systems

최근 터치스크린 Readout 시스템의 연구 경향

  • Jun-Min Lee (Department of Electronic Materials Engineering, Kwangwoon University) ;
  • Ju-Won Ham (Department of Electronic Materials Engineering, Kwangwoon University) ;
  • Woo-Seok Jang (Department of Electronic Materials Engineering, Kwangwoon University) ;
  • Ha-Min Lee (Department of Electronic Materials Engineering, Kwangwoon University) ;
  • Sang-Mo Koo (Department of Electronic Materials Engineering, Kwangwoon University) ;
  • Jong-Min Oh (Department of Electronic Materials Engineering, Kwangwoon University) ;
  • Seung-Hoon Ko (Department of Electronic Materials Engineering, Kwangwoon University)
  • 이준민 (광운대학교 전자재료공학과) ;
  • 함주원 (광운대학교 전자재료공학과) ;
  • 장우석 (광운대학교 전자재료공학과) ;
  • 이하민 (광운대학교 전자재료공학과) ;
  • 구상모 (광운대학교 전자재료공학과) ;
  • 오종민 (광운대학교 전자재료공학과) ;
  • 고승훈 (광운대학교 전자재료공학과)
  • Received : 2023.07.05
  • Accepted : 2023.08.08
  • Published : 2023.09.01
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Abstract

With the increasing demand for mobile devices featuring multi-touch operation, extensive research is being conducted on touch screen panel (TSP) Readout ICs (ROICs) that should possess low power consumption, compact chip size, and immunity to external noise. Therefore, this paper discusses capacitive touch sensors and their readout circuits, and it introduces research trends in various circuit designs that are robust against external noise sources. The recent state-of-the-art TSP ROICs have primarily focused on minimizing the impact of parasitic capacitance (Cp) caused by thin panel thickness. The large Cp can be effectively compensated using an area-efficient current compensator and Current Conveyor (CC), while a display noise reduction scheme utilizing a noise-antenna (NA) electrode significantly improves the signal-to-noise ratio (SNR). Based on these achievements, it is expected that future TSP ROICs will be capable of stable operation with thinner and flexible Touch Screen Panels (TSPs).

Keywords

Acknowledgement

This paper was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0012451) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2021R1F1A1062391, NRF2022R1F1A1074478).

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