Abstract

This paper reports on a low-pass spatial filtering technique for reduction of noise spikes in capacitive touch screen panels. Filter bandwidth is adjusted by dynamically evaluating attenuation of signal and noise spikes. Based on the experimental results, we boost the signal-to-noise ratio by 15.6 dB and attenuate noise spikes by 19.25 dB. The processed signal yields higher detection accuracy and lower power consumption.

© 2016 OAPA

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2016 (1)

S. Gao, J. Lai, C. Micou, and A. Nathan, “Reduction of common-mode noise and global offsets in touch screens by correlated double sampling,” J. Display Technol., vol. 12, no. 6, . 2016.

2014 (3)

L. Zhang, J. Saboune, and A. E. Saddik, “Transforming a regular screen into a touch screen using a single webcam,” J. Display Technol., vol. 10, no. 8, pp. 55–8, 2014.

J. E. Park, D. H. Lin, and D. K. Jeong, “A reconfigurable 40-to-67 dB, 50-to-6400 Hz frame-rate, column-parallel readout IC for capacitive touch-screen panels,” IEEE J. Solid-State Circuits, vol. 49, no. 10, pp. 2305–2318, 2014.

H. Akhtar and R. Kakarala, “A methodology for evaluating accuracy of capacitive touch sensing grid patterns,” J. Display Technol., vol. 10, no. 8, pp. 672–682, 2014.

2013 (2)

I. Guarneri, A. Capra, G. M. Farinella, and S. Battiato, “Shape recognition for capacitive touch display,” SPIE Electron.Imag., 2013.

J. Yanget al., “A noise-immune high-speed readout circuit for in-cell touch screen panels,” IEEE Trans. Circuits Syst. I, Reg. Papers, vol. 60, no. 7, pp. 1800–1809, 2013.

2011 (1)

Z. Baharav and R. Kakarala, “Capacitive touch sensing: Signal and image algorithms,” Proc. SPIE, vol. 7873, pp. 78730H-1–78730H-12, 2011.

2010 (1)

T. Hwang, W. Cui, I. Yang, and O. Kwon, “A highly area-efficient controller for capacitive touch screen panel systems,” IEEE Trans. Consum. Electron., vol. 56, no. 2, pp. 1115–1122, 2010.

1996 (1)

C. Enz and G. Temes, “Circuit Techniques for reducing the effects of op-amp imperfections: Autozeroing, correlated double sampling, and chopper stabilization,” Proc. IEEE, vol. 84, no. 11, pp. 1584–1614, 1996.

1995 (1)

J. C. Russ, “The image processing handbook,” J. Comput. Assist. Tomogr., vol. 19, no. 6, pp. 979–981, 1995.

1987 (1)

J. R. Jensen and K. Lulla, “Introductory digital image processing: A remote sensing perspective,” Geocarto Int., vol. 2, no. 1, pp. 65–65, 1987.

1980 (1)

J. S. Lee, “Digital image enhancement and noise filtering by use of local statistics,” IEEE Trans. Pattern Anal. Mach. Intell., vol. PAMI-2, no. 2, pp. 165–168, 1980.

1974 (1)

M. H. White and D. R. Lampe, “Characterization of surface channel CCD image arrays at low light levels,” IEEE J. Solid-State Circuits, vol. SC-9, no. 1, pp. 1–13, 1974.

Akhtar, H.

H. Akhtar and R. Kakarala, “A methodology for evaluating accuracy of capacitive touch sensing grid patterns,” J. Display Technol., vol. 10, no. 8, pp. 672–682, 2014.

Anderson, E.

E. Anderson, “Reduce display noise in capacitive touchscreens,” White Paper, Cypress Semiconductor Corp., San Jose, CA, USA, 2013.

Baharav, Z.

Z. Baharav and R. Kakarala, “Capacitive touch sensing: Signal and image algorithms,” Proc. SPIE, vol. 7873, pp. 78730H-1–78730H-12, 2011.

Battiato, S.

I. Guarneri, A. Capra, G. M. Farinella, and S. Battiato, “Shape recognition for capacitive touch display,” SPIE Electron.Imag., 2013.

I. Guarneri, C. Capra, A. Castorina, S. Battiato, and M. G. Farinella, “PCA based shape recognition for capacitive touch display,” in Proc. IEEE Int. Conf. Consumer Electron., 2013, pp. 1–2.

Capra, A.

I. Guarneri, A. Capra, G. M. Farinella, and S. Battiato, “Shape recognition for capacitive touch display,” SPIE Electron.Imag., 2013.

Capra, C.

I. Guarneri, C. Capra, A. Castorina, S. Battiato, and M. G. Farinella, “PCA based shape recognition for capacitive touch display,” in Proc. IEEE Int. Conf. Consumer Electron., 2013, pp. 1–2.

Castorina, A.

I. Guarneri, C. Capra, A. Castorina, S. Battiato, and M. G. Farinella, “PCA based shape recognition for capacitive touch display,” in Proc. IEEE Int. Conf. Consumer Electron., 2013, pp. 1–2.

Cha, S.

A. Nathan, J. C. S. Lai, S. Cha, and C. Church, “Pressure sensing display device,” U.S. Patent US20140008203 A1, 9, 2014.

Chang, C.

J. Liu, L. Liu, C. Chang, and S. Tai, “Touch device and driving method of touch panel thereof,” U.S. Patent US20140145965 A1, 29, 2014.

Choi, J. M.

J. H. Yang, J. M. Choi, Y. S. Kim, and H. S. Oh, “Control circuit of touch screen and noise removing method,” U.S. Patent US20130300690 A1, 14, 2013.

Church, C.

A. Nathan, J. C. S. Lai, S. Cha, and C. Church, “Pressure sensing display device,” U.S. Patent US20140008203 A1, 9, 2014.

Cui, W.

T. Hwang, W. Cui, I. Yang, and O. Kwon, “A highly area-efficient controller for capacitive touch screen panel systems,” IEEE Trans. Consum. Electron., vol. 56, no. 2, pp. 1115–1122, 2010.

Enz, C.

C. Enz and G. Temes, “Circuit Techniques for reducing the effects of op-amp imperfections: Autozeroing, correlated double sampling, and chopper stabilization,” Proc. IEEE, vol. 84, no. 11, pp. 1584–1614, 1996.

Farinella, G. M.

I. Guarneri, A. Capra, G. M. Farinella, and S. Battiato, “Shape recognition for capacitive touch display,” SPIE Electron.Imag., 2013.

Farinella, M. G.

I. Guarneri, C. Capra, A. Castorina, S. Battiato, and M. G. Farinella, “PCA based shape recognition for capacitive touch display,” in Proc. IEEE Int. Conf. Consumer Electron., 2013, pp. 1–2.

Gao, S.

S. Gao, J. Lai, C. Micou, and A. Nathan, “Reduction of common-mode noise and global offsets in touch screens by correlated double sampling,” J. Display Technol., vol. 12, no. 6, . 2016.

Guarneri, I.

I. Guarneri, A. Capra, G. M. Farinella, and S. Battiato, “Shape recognition for capacitive touch display,” SPIE Electron.Imag., 2013.

I. Guarneri, C. Capra, A. Castorina, S. Battiato, and M. G. Farinella, “PCA based shape recognition for capacitive touch display,” in Proc. IEEE Int. Conf. Consumer Electron., 2013, pp. 1–2.

Guo, Y.

J. Zhang, Y. Guo, and L. Mo, “Multi-touch detection method for capacitive touch screens,” U.S. Patent US20110221701 A1, 15, 2011.

Hagermoser, B. O.

B. O. Hagermoseret al., “Touch panel system and method for distinguishing multiple touch inputs,” U.S. Patent US7254775 B2, 7, 2007.

Hotelling, S.

W. C. Westerman and S. Hotelling, “Perpheral pixel noise reduction,” U.S. Patent US7643010 B2, 5, 2010.

S. Hotellinget al., “Gestures for touch sensitive input devices,” U.S. Patent US20060026521 A1, 2, 2006.

Hotelling, S. P.

B. R. Land and S. P. Hotelling, “Error compensation for multi-touch surfaces,” U.S. Patent US7692638 B2, 2010.

S. P. Hotellinget al., “Ground detection for touch sensitive device,” U.S. Patent WO2011008610 A1, 20, 2011.

B. R. Land, M. Yousefpor, and S. P. Hotelling, “Negative pixel compensation,” U.S. Patent US8570301 B2, 29, 2013.

Huang, Y. H.

C. M. Lai, Y. H. Yeh, and Y. H. Huang, “Pixel structure of active matrix organic light-emitting diode and method for fabricating the same,” U.S. Patent US20070152217 A1, 5, 2007.

Hwang, T.

T. Hwang, W. Cui, I. Yang, and O. Kwon, “A highly area-efficient controller for capacitive touch screen panel systems,” IEEE Trans. Consum. Electron., vol. 56, no. 2, pp. 1115–1122, 2010.

Jang, H.

H. Shin, S. Ko, H. Jang, I. Yun, and K. Lee, “A 55dB SNR with 240Hz frame scan rate mutual capacitor 30 × 24 touch-screen panel read-out IC using code-division multiple sensing technique,” in Proc. IEEE Int. Solid-State Circuits Conf. ISSCC Dig. Tech. Papers, 2013, pp. 388–389.

H. Jang, H. Shin, S. Ko, I. Yun, and K. Lee, “2D coded-aperture-based ultra-compact capacitive touch-screen controller with 40 reconfigurable channels,” in Proc. IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, 2014, pp. 218–219.

S. Ko, H. Shin, H. Jang, L. Yun, and K. Lee, “A 70 dB SNR capacitive touch screen panel readout IC using capacitor-less trans-impedance amplifier and coded orthogonal frequency-division multiple sensing scheme,” in Proc. IEEE Symp. Very Large Scale Integr., 2013, pp. C216–C217.

Jensen, J. R.

J. R. Jensen and K. Lulla, “Introductory digital image processing: A remote sensing perspective,” Geocarto Int., vol. 2, no. 1, pp. 65–65, 1987.

Jeong, D. K.

J. E. Park, D. H. Lin, and D. K. Jeong, “A reconfigurable 40-to-67 dB, 50-to-6400 Hz frame-rate, column-parallel readout IC for capacitive touch-screen panels,” IEEE J. Solid-State Circuits, vol. 49, no. 10, pp. 2305–2318, 2014.

Jordan, J.

J. Jordan, “Sensing and defining an input object,” U.S. Patent US20110057670 A1, 10, 2011.

Kakarala, R.

H. Akhtar and R. Kakarala, “A methodology for evaluating accuracy of capacitive touch sensing grid patterns,” J. Display Technol., vol. 10, no. 8, pp. 672–682, 2014.

Z. Baharav and R. Kakarala, “Capacitive touch sensing: Signal and image algorithms,” Proc. SPIE, vol. 7873, pp. 78730H-1–78730H-12, 2011.

Kim, K.

K. Kimet al., “A capacitive touch controller robust to display noise for ultrathin touch screen displays,” in Proc. IEEE Int. Solid-State Circuits Conf. Dig Tech. Papers, 2012, pp. 116–117.

Kim, K. J.

H. S. Lee, T. J. Park, and K. J. Kim, “Touch sensing method and touch sensing device,” U.S. Patent US20140139478 A1, 22, 2014.

Kim, Y. S.

J. H. Yang, J. M. Choi, Y. S. Kim, and H. S. Oh, “Control circuit of touch screen and noise removing method,” U.S. Patent US20130300690 A1, 14, 2013.

Klein, H. W.

H. W. Klein, “Noise immunity of touchscreen devices,” White Paper, Cypress Semiconductor Corp., San Jose, CA, USA, 2013.

Ko, S.

S. Ko, H. Shin, H. Jang, L. Yun, and K. Lee, “A 70 dB SNR capacitive touch screen panel readout IC using capacitor-less trans-impedance amplifier and coded orthogonal frequency-division multiple sensing scheme,” in Proc. IEEE Symp. Very Large Scale Integr., 2013, pp. C216–C217.

S. Koet al., “Low noise capacitive sensor for multi-touch mobile handset's applications,” in Proc. IEEE Asian Solid State Circuits Conf., 2010, pp. 1–4.

H. Jang, H. Shin, S. Ko, I. Yun, and K. Lee, “2D coded-aperture-based ultra-compact capacitive touch-screen controller with 40 reconfigurable channels,” in Proc. IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, 2014, pp. 218–219.

H. Shin, S. Ko, H. Jang, I. Yun, and K. Lee, “A 55dB SNR with 240Hz frame scan rate mutual capacitor 30 × 24 touch-screen panel read-out IC using code-division multiple sensing technique,” in Proc. IEEE Int. Solid-State Circuits Conf. ISSCC Dig. Tech. Papers, 2013, pp. 388–389.

Ko, Y.

T. Wang, Y. Ko, and C. Lai, “Gesture detecting method capable of filtering panel mistouch,” U.S. Patent US20130093692, 2013.

Kwon, O.

T. Hwang, W. Cui, I. Yang, and O. Kwon, “A highly area-efficient controller for capacitive touch screen panel systems,” IEEE Trans. Consum. Electron., vol. 56, no. 2, pp. 1115–1122, 2010.

Lai, C.

T. Wang, Y. Ko, and C. Lai, “Gesture detecting method capable of filtering panel mistouch,” U.S. Patent US20130093692, 2013.

Lai, C. M.

C. M. Lai, Y. H. Yeh, and Y. H. Huang, “Pixel structure of active matrix organic light-emitting diode and method for fabricating the same,” U.S. Patent US20070152217 A1, 5, 2007.

Lai, J.

S. Gao, J. Lai, C. Micou, and A. Nathan, “Reduction of common-mode noise and global offsets in touch screens by correlated double sampling,” J. Display Technol., vol. 12, no. 6, . 2016.

Lai, J. C. S.

A. Nathan, J. C. S. Lai, S. Cha, and C. Church, “Pressure sensing display device,” U.S. Patent US20140008203 A1, 9, 2014.

Lampe, D. R.

M. H. White and D. R. Lampe, “Characterization of surface channel CCD image arrays at low light levels,” IEEE J. Solid-State Circuits, vol. SC-9, no. 1, pp. 1–13, 1974.

Land, B. R.

B. R. Land and S. P. Hotelling, “Error compensation for multi-touch surfaces,” U.S. Patent US7692638 B2, 2010.

B. R. Land, M. Yousefpor, and S. P. Hotelling, “Negative pixel compensation,” U.S. Patent US8570301 B2, 29, 2013.

Lee, H. S.

H. S. Lee, T. J. Park, and K. J. Kim, “Touch sensing method and touch sensing device,” U.S. Patent US20140139478 A1, 22, 2014.

Lee, J. S.

J. S. Lee, “Digital image enhancement and noise filtering by use of local statistics,” IEEE Trans. Pattern Anal. Mach. Intell., vol. PAMI-2, no. 2, pp. 165–168, 1980.

Lee, K.

S. Ko, H. Shin, H. Jang, L. Yun, and K. Lee, “A 70 dB SNR capacitive touch screen panel readout IC using capacitor-less trans-impedance amplifier and coded orthogonal frequency-division multiple sensing scheme,” in Proc. IEEE Symp. Very Large Scale Integr., 2013, pp. C216–C217.

H. Shin, S. Ko, H. Jang, I. Yun, and K. Lee, “A 55dB SNR with 240Hz frame scan rate mutual capacitor 30 × 24 touch-screen panel read-out IC using code-division multiple sensing technique,” in Proc. IEEE Int. Solid-State Circuits Conf. ISSCC Dig. Tech. Papers, 2013, pp. 388–389.

H. Jang, H. Shin, S. Ko, I. Yun, and K. Lee, “2D coded-aperture-based ultra-compact capacitive touch-screen controller with 40 reconfigurable channels,” in Proc. IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, 2014, pp. 218–219.

Lim, J. S.

J. S. Lim, Two-Dimensional Signal and Image Processing. Englewood Cliffs, NJ, USA: Prentice-Hall, 1990.

Lin, D. H.

J. E. Park, D. H. Lin, and D. K. Jeong, “A reconfigurable 40-to-67 dB, 50-to-6400 Hz frame-rate, column-parallel readout IC for capacitive touch-screen panels,” IEEE J. Solid-State Circuits, vol. 49, no. 10, pp. 2305–2318, 2014.

Liu, J.

J. Liu, L. Liu, C. Chang, and S. Tai, “Touch device and driving method of touch panel thereof,” U.S. Patent US20140145965 A1, 29, 2014.

Liu, L.

J. Liu, L. Liu, C. Chang, and S. Tai, “Touch device and driving method of touch panel thereof,” U.S. Patent US20140145965 A1, 29, 2014.

Lulla, K.

J. R. Jensen and K. Lulla, “Introductory digital image processing: A remote sensing perspective,” Geocarto Int., vol. 2, no. 1, pp. 65–65, 1987.

McAndrew, A.

A. McAndrew, “An introduction to digital image processing with MATLAB,” Lecture note for SCM2511 Image Processing, Boston, MA, US: Course Technology Press, Univ. of Technology, 2004.

Micou, C.

S. Gao, J. Lai, C. Micou, and A. Nathan, “Reduction of common-mode noise and global offsets in touch screens by correlated double sampling,” J. Display Technol., vol. 12, no. 6, . 2016.

Miura, N.

N. Miuraet al., “A 1 mm-pitch 80 × 80-channel 322 Hz-frame-rate touch sensor with two-step dual-mode capacitance scan,” in Proc. IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, 2014, pp. 216–217.

Mo, L.

J. Zhang, Y. Guo, and L. Mo, “Multi-touch detection method for capacitive touch screens,” U.S. Patent US20110221701 A1, 15, 2011.

Nathan, A.

S. Gao, J. Lai, C. Micou, and A. Nathan, “Reduction of common-mode noise and global offsets in touch screens by correlated double sampling,” J. Display Technol., vol. 12, no. 6, . 2016.

A. Nathan, J. C. S. Lai, S. Cha, and C. Church, “Pressure sensing display device,” U.S. Patent US20140008203 A1, 9, 2014.

Oh, H. S.

J. H. Yang, J. M. Choi, Y. S. Kim, and H. S. Oh, “Control circuit of touch screen and noise removing method,” U.S. Patent US20130300690 A1, 14, 2013.

Ohta, J.

J. Ohta, Smart CMOS Image Sensors and Applications. Boca Raton, FL, USA: CRC Press, 2007.

Park, J. E.

J. E. Park, D. H. Lin, and D. K. Jeong, “A reconfigurable 40-to-67 dB, 50-to-6400 Hz frame-rate, column-parallel readout IC for capacitive touch-screen panels,” IEEE J. Solid-State Circuits, vol. 49, no. 10, pp. 2305–2318, 2014.

Park, T. J.

H. S. Lee, T. J. Park, and K. J. Kim, “Touch sensing method and touch sensing device,” U.S. Patent US20140139478 A1, 22, 2014.

Philipp, H.

H. Philipp, “Capacitive sensor and array,” U.S. Patent US6452514 B1, 15, 2002.

Russ, J. C.

J. C. Russ, “The image processing handbook,” J. Comput. Assist. Tomogr., vol. 19, no. 6, pp. 979–981, 1995.

Saboune, J.

L. Zhang, J. Saboune, and A. E. Saddik, “Transforming a regular screen into a touch screen using a single webcam,” J. Display Technol., vol. 10, no. 8, pp. 55–8, 2014.

Saddik, A. E.

L. Zhang, J. Saboune, and A. E. Saddik, “Transforming a regular screen into a touch screen using a single webcam,” J. Display Technol., vol. 10, no. 8, pp. 55–8, 2014.

Shin, H.

S. Ko, H. Shin, H. Jang, L. Yun, and K. Lee, “A 70 dB SNR capacitive touch screen panel readout IC using capacitor-less trans-impedance amplifier and coded orthogonal frequency-division multiple sensing scheme,” in Proc. IEEE Symp. Very Large Scale Integr., 2013, pp. C216–C217.

H. Shin, S. Ko, H. Jang, I. Yun, and K. Lee, “A 55dB SNR with 240Hz frame scan rate mutual capacitor 30 × 24 touch-screen panel read-out IC using code-division multiple sensing technique,” in Proc. IEEE Int. Solid-State Circuits Conf. ISSCC Dig. Tech. Papers, 2013, pp. 388–389.

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