IEIE Transactions on Smart Processing and Computing

The Institute of Electronics and Information Engineers (대한전자공학회)
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Efficient Multi-Touch Detection Algorithm for Large Touch Screen Panels

  • Mohamed, Mohamed G.A. (Department of Electronics Engineering, Chungbuk National University) ;
  • Cho, Tae-Won (Department of Electronics Engineering, Chungbuk National University) ;
  • Kim, HyungWon (Department of Electronics Engineering, Chungbuk National University)
  • Received : 2013.12.20
  • Accepted : 2014.05.12
  • Published : 2014.08.31
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Abstract

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.

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References

  1. Incheol Seo, Tae-won Cho, Hyung-won Kim, Hyung-Gyu Jang, Sun-Woo Lee, "Frequency Domain Concurrent Sensing Technique for Large Touch Screen Panels", IEEK Fall., pp. 55-58, Nov. 2013.
  2. Mohamed, M.G.A., Unyong, J., Incheol, S., et al.: "Efficient algorithm for accurate touch detection of large touch screen panels," in Consumer Electronics (ISCE 2014), The 18th IEEE International Symposium on, 2014, pp. 1-2.
  3. Yang, J.-H., Park, S.-H., Jeon, J.-Y., et al.: 'P-134: A High-SNR Area-Efficient Readout Circuit using a Delta-Integration Method for Capacitive Touch Screen Panels'," SID Symposium Digest of Technical Papers, 2012, 43, pp. 1570-1573.
  4. Ik-Seok, Y.,Oh-Kyong, K.: 'A touch controller using differential sensing method for on-cell capacitive touch screen panel systems'," Consumer Electronics, IEEE Transactions on, 2011, 57, pp. 1027-1032. https://doi.org/10.1109/TCE.2011.6018851

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