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Electromagnetic field analysis of capacitive touch panels
Kyuwon Kyoung,Reiji Hattori 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.3
The characteristics of capacitive touch panels were examined via electromagnetic field numerical analysis, with focus onthe comparison between self- and mutual-capacitive panels. The results indicate the need for an AC-voltage-applied shieldelectrode and a high-sensitivity self-capacitive panel. The results also highlight a spatial resolution issue and the electricalrole of dummy electrodes in the mutual-capacitive panel.
Kwon, Kihyun,Kim, Sung-Woo,Bien, Franklin,Kim, Jae Joon The Institute of Electronics and Information Engin 2015 Journal of semiconductor technology and science Vol.15 No.3
A fully-differential touch-screen sensing architecture is presented to improve noise immunity and also support most multi-touch events minimizing the number of amplifiers and their silicon area. A correlated double sampling function is incorporated to reduce DC offset and low-frequency noises, and a stabilizer circuit is also embedded to minimize inherent transient fluctuations. A prototype of the proposed readout circuit was fabricated in a $0.18{\mu}m$ CMOS process and its differential operation in response to various touch events was experimentally verified. With a 3.3 V supply, the current dissipation was 3.4 mA at normal operation and $140{\mu}A$ in standby mode.
Kihyun Kwon,Sung-Woo Kim,Franklin Bien,Jae Joon Kim 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.3
A fully-differential touch-screen sensing architecture is presented to improve noise immunity and also support most multi-touch events minimizing the number of amplifiers and their silicon area. A correlated double sampling function is incorporated to reduce DC offset and low-frequency noises, and a stabilizer circuit is also embedded to minimize inherent transient fluctuations. A prototype of the proposed readout circuit was fabricated in a 0.18 mm CMOS process and its differential operation in response to various touch events was experimentally verified. With a 3.3 V supply, the current dissipation was 3.4 mA at normal operation and 140 mA in standby mode.
Efficient Multi-Touch Detection Algorithm for Large Touch Screen Panels
Mohamed, Mohamed G.A.,Cho, Tae-Won,Kim, HyungWon The Institute of Electronics and Information Engin 2014 IEIE Transactions on Smart Processing & Computing Vol.3 No.4
Large mutual capacitance touch screen panels (TSP) are susceptible to display and ambient noise. This paper presents a multi-touch detection algorithm using an efficient noise compensation technique for large mutual capacitance TSPs. The sources of noise are presented and analyzed. The algorithm includes the steps to overcome each source of noise. The algorithm begins with a calibration technique to overcome the TSP mutual capacitance variation. The algorithm also overcomes the shadow effect of a hand close to TSP and mutual capacitance variation by dynamic threshold calculations. Time and space filters are also used to filter out ambient noise. The experimental results were used to determine the system parameters to achieve the best performance.
홍순민(Soonmin Hong),송봉기(Bonggi Song),권민석(Minseok Kwon),신성환(Seonghwan Shin) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Recently, many automotive parts are replaced with electronic devices. Because of functional requirements for customer convenience, a number of sensor application part is increasing. On the other hand, capacitive sensor technology has made great progress with the development of touch screen of smart phone. And now, many electronic devices begin to use capacitive sensor instead of mechanical switch. Due to capacitive sensor is good durability and it is possible to miniaturize and it can measure proximity and detect human touch, there are various attempts and studies to use capacitive sensor in the automotive part area. Since, the most common cause of sensor incorrect operation is water, this is difficult factor to apply the sensor to automobile exterior parts. In this paper, we propose a integrated capacitive sensing method that uses both self capacitance and mutual capacitance and by using signal pattern obtained by the sensor it shows the possibility to avoid incorrect operation caused by water.
반응성이 있는 메타크릴레이트 공중합체를 이용한 정전용량형 습도센서
공명선,이임렬 한국마이크로전자및패키징학회 2003 마이크로전자 및 패키징학회지 Vol.10 No.4
정전 용량형 고분자막 감습재료로 사용하기 위하여 서로 반응성이 있는 공중합체들 methyl methacrylate (MMA), ethyl methacrylate (EMA), acrylic acid (MA) 와 hydroxyethyl methacrylate (HEMA)의 공중합체들을 합성하였다. 정전 용량형 습도센서는 가교화된 폴리메타크릴레이트 공중합체 막의 양면에 금 전극을 형성시켜 제조하였다. 공중합체에서의 HEMA양이 증가할수록 상대습도에 따른 정전 용량은 증가하였다. MMA/MA/HEMA=40/10/10의 경우, 상대습도가 30%RH, 60%RH 및 90%RH에서의 정전 용량은 각 102, 134와 165 pF이었다. 또한 히스테리시스, 온도 사이클 그리고 장기안정성 결과를 측정하여 정전용량형 습도센서로서의 특성을 평가하였다. The copolymers with various composition of methyl methacrylate (MMA), ethyl methacrylate (EMA), methacrylic acid (MA) and hydroxyethyl methacrylate (HEMA) were synthesized for capacitive humidity sensitive materials. The capacitive humidity sensor consisted of a polymethacrylate film coated on both sides with gold electrode. Capacitance versus relative humidity increased with HEMA content in the copolymer. In the case of self-crosslinkable MMA/MA/HEHA= 40/10/10, the average capacitance at 30%RH, 60%RH and 90%RH are 102, 134 and 166 pF, respectively. And also, the hysteresis, temperature cycle and long-term stability were evaluated as a capacitance humidity sensor.
모하메드 모하메드 가말 아흐메드,김형원,조태원,Mohamed, Mohamed G.A.,Kim, HyungWon,Cho, Tae-Won The Institute of Electronics and Information Engin 2015 전자공학회논문지 Vol.52 No.4
최근 스마트폰의 발달과 더불어 대형 TV, 의료용 장비 및 전자 칠판에도 터치스크린의 수요가 급증하고 있다. 스크린 사이즈가 증가 할수록 고해상도를 위하여 훨씬 더 많은 채널이 추가 되면서 한 프레임을 스캔하는데 긴 시간이 소요되어 터치감지 지연이 큰 문제가 되고 있다. 본 논문에서는 이러한 문제를 해결하기 위하여 새로운 드라이빙 및 센싱 기법을 제안한다. 이 기법은 differential 드라이빙 방법으로 2 단계로 수행되어진다. 먼저 고속 센싱 프로세스를 통해 터치가 발생된 센싱 라인들을 우선 대략적으로 도출해 낸 후 정확한 터치 위치 스캔을 위해서 터치된 라인에서만 감지가 수행되어 진다. 이 방법을 사용하면 터치 패널의 frame refresh rate를 향상 시킬 수 있다. 제안된 구조는 FPGA와 개발된 AFE board로 구현되었으며, 23인치 상용 터치패널을 사용하여 테스트하였다. 이 기법은 기존 대비 frame scan rate를 8.4배 향상시킨다. Recently the demand for projected capacitance touch screens is sharply growing especially for large screens for medical devices, PC monitors and TVs. Large touch screens in general need a controller of higher complexity. They usually have a larger number of driving and sensing lines, and hence it takes longer to scan one frame for touch detection leading to a low frame scan rate. In this paper, a novel touch screen control technique is presented, which scans each frame in two steps of simultaneous multi-channel driving. The first step is to drive all driving lines simultaneously and determine which sensing lines have any touch. The second step is to sequentially rescan only the touched sensing lines, and determine exact positions of the touches. This technique can substantially increase the frame scan rate. This technique has been implemented using an FPGA and an AFE board, and tested using a commercial 23-inch touch screen panel. Experimental results show that the proposed technique improves the frame scan rate by 8.4 times for the 23-inch touch screen panel over conventional methods.
Single-ended amplifier-based touch readout circuit with immunity to display noise
Yoo Yongsang,Choi Byong-Deok 한국정보디스플레이학회 2023 Journal of information display Vol.24 No.2
To suppress errors in a touch readout circuit due to display noise, differential sensing using fully differential amplifiers is widely used. However, conventional differential sensing methods require additional circuits or increase circuit complexity, thus increasing power consumption and circuit area or requiring additionaldummyRX line on the touch panel. In this study, we propose a compact touch readout circuit composed of a single-ended amplifier while keeping the display noise suppression of differential sensing so as to minimize power consumption and circuit area increase and avoid the need for additional dummy RX line. The proposed touch readout circuit for is fabricated in circuit area of 0.4mm2 with 0.35μm 3.3 V CMOS process and measured for 10.1-inch touch panel on top of a TFT-LCD panel. With the proposed touch readout circuit, the signal-to-noise ratio (SNR) is improved by up to 13.1 dB compared to the conventional touch readout circuit using single-ended amplifiers.