THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 25(1), IS

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 25(1), ISSN (Print) ISSN X (Online) Circuit Modeling and Analysis of Touch Screen Panel 변기식 민병욱 Kisik Byun Byung-Wook Min 요약,. 2D EM circuit, 23 5 RC. EM/circuit 5 RC S, khz RC khz. Abstract A simple RC circuit model of large-scale touch screen panels is developed and the frequency range of the RC model is analyzed. 2D EM simulation results of a single touch cell are cascaded for a 23 inch touch panel using a circuit simulator, and the shortest and longest channels of the full panel are modeled with a 5-element RC circuit. The 5-element RC circuit can model the touch screen panel upto 130 khz with the channel phase error of element RC circuit model is also proposed and the frequency range for the channel phase error of 10 is extended to 200 khz. Key words: Capacitive Touch Screen, RC Circuit Model. 서론,,,.,. [1],[2]., [3],[4]. EM/circuit 23 RC, RC [5] RC. (Department of Electrical and Electronic Engineering, Yonsei University) Manuscript received August 23, 2013 ; Revised October 30, 2013 ; Accepted December 12, (ID No S) Corresponding Author: Byung-Wook Min ( bmin@yonsei.ac.kr) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 47

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 1, Jan. 2014., 7 RC,.. 터치패널과 5소자 RC 모델링 1 stack-up (Case,, ). Case GFF Glass- - 2. Case G1F Glass-, [6].

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 1, Jan , 7 RC,.. 터치패널과 5소자 RC 모델링 1 stack-up (Case,, ). Case GFF Glass Case G1F Glass-, [6]. OCA(Optically Clear Adhesive) 5.12 [7], 3.28 PET. PET ITO(Indium Tin Oxide) metal mesh. ITO, 150 Ω/o. 20 metal mesh ITO. Metal mesh metal,. 1 metal mesh. mesh metal, pitch metal, mesh. 표 1. Metal mesh Table 1. Characteristics of metal mesh. Metal mesh type (um) Pitch (um) (Ω/o) mesh A mesh B TX driver, RX receiver. TX driver RX receiver, TX driver.., 20 EM., RX TX EM., (=TX RX ). 2(b), EM 그림 1. stack-up Fig. 1. Stack-up of touch screen panel. 48

3 그림 2. (a) 23 (b) (c) TX-RX Fig. 2. (a) 23 inch touch screen panel, (b) model of the single touch cell and (c) model of TX-RX channel., TX RX (Rcell_tx, Rcell_rx), (Ccell_tx, Ccell_ rx), (Ccell_mutual). Stack-up (Case I,, ) 2D EM 2., Shortest Longest, R. C curve fitting., driver, receiver Ground. EM TX driver RX receiver TX-RX circuit 2(c) 5 RC. TX-RX 표 2. Stack-up, metal mesh, gap RC Table 2. Single cell RC modeling parameters according to stack-up, metal mesh and gap material. Stack-up TX, RX Layer RX : mesh B TX : mesh B Rcell_tx Rcell_rx Ccell_tx (ff) Ccell_rx (ff) Ccell_mutual

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 1, Jan S21 magnitude (db) RC model inch panel (EM/Circuit sim.) Frequency (khz) Shortest Longest 100 그림 3. TX-RX 5 S Fig. 3. S-parameters of TX-RX channels and 5-element RC circuit model. (shortest and longest path),. 3 case EM/ circuit 5 RC S. 5 TX-RX. 5 RC, 130 khz 10 S on/off, S21 phase (degree) sample, hold, transfer,.,. 130 khz us [8]. TX-RX, 10. Stack-up (Case I,, ) TX-RX RC 3. Metal mesh B 0.01 Ω/o, Case I RX (R_rx) Case TX (R_tx). TX-RX (R_tx, R_rx),., path (Cself), longest (Cself) shortest. layer conductivity, (Cself) longest path shortest path., [9]., 표 3. Stack-up RC Table 3. Touch screen panel RC modeling parameters according to stack-up and channel length. Stack-Up TX, RX Layer RX : mesh B TX : mesh B TX-RX R_tx R_rx Cself_tx Cself_rx Cmutual Longest 7, Shortest Longest , Shortest Longest 7,240 18, Shortest

5 . 20 %. Minimum detectable Cmutual/Cself_rx 100. minimum detectable 0.51 %., (Cmutual) TX-RX (Cself_ tx, Cself_tx).. 주파수영역확장 7소자모델. 5 RC 130 khz., 7 RC RC. 5 RX, TX 1 1, 7 RX, TX ,, (R_rx =0.5 R_rx)., EM/circuit, 7 RC 5 S. 200 khz Longest 7 RC 5 RC, RC, 10 S21 magnitude (db) element RC model inch panel (EM/Circuit sim.) element RC model Frequency (khz) Shortest Longest 100 그림 5. TX-RX 7 S Fig. 5. S-parameters of TX-RX channels and 7-element RC circuit model. S khz.. 결론 2D EM circuit, 23 TX-RX 5 RC., 5 RC 130 khz 10 S 21., 7 RC 10 S khz S21 phase (degree) References 그림 4. TX-RX 7 RC Fig element RC circuit model for TX-RX channels. [1], " (TSP) ",, 1577, pp. 1-11, [2] Mudit Ratana Bhalla, Anad Vardhan Bhalla, "Compa- 51

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 1, Jan. 2014. 정우석, "윈도우 일체형 대면적 터치스크린 패널", 전 기전자재료, 25(12), pp. 21-27, 2012년 12월.

8, pp. 12-18, 2010. [3] Jun-Hyeok Yang, et al., "A highly noise-immune touch controller using filtered-delta-integration and a charge_interpolation technique for 10.

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 25, no. 1, Jan 정우석, "윈도우 일체형 대면적 터치스크린 패널", 전 기전자재료, 25(12), pp , 2012년 12월. [7] 박은숙, 박지원, 김현중, "디스플레이용 점 접착 소 재", Polymer Science and Technology, vol. 23, no, 1, pp. rative study of various touchscreen technologies", International Journal of Computer Applications, vol. 6, no. 8, pp , [3] Jun-Hyeok Yang, et al., "A highly noise-immune touch controller using filtered-delta-integration and a charge_interpolation technique for 10.1-inch capacitive touch-screen panels", Solid-State Circuits Conference Digest of Technical Papers(ISSCC), 2013 IEEE International, pp , [4] Gary Barrett, Ryomei Omote, "Projected-c apacitive touch technology", Information Display, 3/10, pp , [5],, "23 ", 2013, 1(1), pp. 201, [6] 변기 식 민병 욱 변기식 민병욱 인치 터치스크린 패널의 회로 모 델링 및 분석 한국전자파학회 하계종합학술대 회 년월 년 2월: 한양대학교 전자통신컴퓨터 공학부 (공학사) 2013년 3월 현재: 연세대학교 전기전자 공학과 석사과정 [주 관심분야] 마이크로파 회로, Graphene 2013 Device , [8] Hyungcheol Shin, Seunghoon Ko, Hongjae Jang, Ilhyun Yun, and Kwyro Lee, "A 55 db SNR with 240 Hz frame scan rate mutual capacitor touch-screen panel readout IC using code-division multiple sensing technique", Solid-State Circuits Conference Digest of Technical Papers(ISSCC), 2013 IEEE International, pp , [9]," ", 정도영 대면적 정전식 터치스크린 패널을 위한 고성 능 터치 검출회로 설계 연세대학교 대학원 전기전자 공학과 년 월 년 8월: 서울대학교 전기공학부 (공학 사 년 8월: 미국 University of Michigan, Arbor (공학석사) 년 4월: 미국 University of Michigan, Arbor (공학박사) 년 1월 2010년 12월: Qualcomm Inc. Senior Engineer 2011년 9월 현재: 연세대학교 전기전자공학부 조교수 [주 관심분야] 밀리미터파 집적회로, 마이크로파 회로, 위상배 열 안테나시스템, Analog/RF IC 2002 ) 2004 Ann 2008 Ann 2008

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct ,,. 0.5 %.., cm mm FR4 (ε r =4.4)

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Oct.; 29(10), 799 804. http://dx.doi.org/10.5515/kjkiees.2018.29.10.799 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Method