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Touch Position Recovery Algorithm for Differential Sensing Touch Screen
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 Title & Authors
Touch Position Recovery Algorithm for Differential Sensing Touch Screen
Kim, Ji-Ho; Won, Dong-Min; Kim, HyungWon;
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Differential sensing methods are more effective in alleviating panel noise than single-line sensing, and thus have been increasingly used in the touch screen industry. However, they have a drawback: they tend to cancel out multiple touches and need touch position recovery algorithms. This paper introduces a novel algorithm of touch position recovery for differential sensing, which is a low-complexity but high-accuracy approach for determining multiple touch positions. We have implemented the proposed method in a touch screen controller system on a chip. In the simulation experiments using realistic touch screen models and a differential sensing circuit, the algorithm exhibited a high detection performance of a signal-to-noise ratio gain of up to 52.21 dB. Therefore, we can conclude that the proposed method is substantially more accurate than the previous method. Further, the proposed method incurs little or no overhead in terms of the detection speed and the chip size.
Differential sensing;Recovery algorithm;Touch controller;Touch screen panel;
 Cited by
C. L. Lin, Y. M. Chang, H. S. Chen, C. Y. Chuang, and T. C. Chu, “Position tracking based on particle filter for self-capacitance single-touch screen panels,” Journal of Display Technology, vol. 11, no. 2, pp. 165-169, 2015. crossref(new window)

P. Y. Li and Z. W. Li, “Study on calibration algorithm of embedded touch screen,” Journal of Multimedia, vol. 9, no. 4, pp. 605-610, 2014.

C. L. Lin, C. S. Li, Y. M. Chang, T. C. Lin, J. F. Chen, and U. C. Lin, “Pressure sensitive stylus and algorithm for touchscreen panel,” Journal of Display Technology, vol. 9, no. 1, pp. 17-23, 2013. crossref(new window)

S. M. Kim, H. Cho, M. Nam, S. G. Choi, and K. Cho, “Low-power touch-sensing circuit with reduced scanning algorithm for touch screen panels on mobile devices,” Journal of Display Technology, vol. 11, no. 1, pp. 36-43, 2015. crossref(new window)

N. K. Mada and H. Jagadish, "Waking up a capacitive touch-sensing device with an MCU peripheral," 2011 [Internet], Available:

I. S. Yang, and O. K. Kwon, “A touch controller using differential sensing method for on-cell capacitive touch screen panel systems,” IEEE Transactions on Consumer Electronics, vol. 57, no. 3, pp. 1027-1032, 2011. crossref(new window)

M. G. M. Mohamed, H. Kim, and T. W. Cho, “A fast sensing method using concurrent driving and sequential sensing for large capacitance touch screens,” Journal of the Institute of Electronics and Information Engineers, vol. 52, no. 4, pp. 62-70, 2015. crossref(new window)

X. Wu, B. W. Lee, C. Joung, and S. Jang, "Touchware: a software based implementation for high resolution multi-touch applications," in Proceedings of IEEE 10th International Conference on Computer and Information Technology, Bradford, UK, pp. 1703-1710, 2010.

I. Seo, T. W. Cho, H. W. Kim, H. G. Jang, and S. W. Lee, "Frequency domain concurrent sensing technique for large touchscreen panels," in Proceedings of the IEEK Fall Conference, Seoul, pp. 55-58, 2013.

D. H. Lim, J. E. Park, and D. K. Jeong, "A low-noise differential front-end and its controller for capacitive touch screen panels," in Proceedings of the European Solid-State Circuits Conference (ESSCIRC), Bordeaux, France, pp. 237-240, 2012.

C. L. Lin, Y. M. Chang, C. C. Hung, C. D. Tu, and C. Y. Chuang, “Position estimation and smooth tracking with a fuzzy-logic-based adaptive strong tracking kalman filter for capacitive touch panels,” IEEE Transactions on Industrial Electronics, vol. 62, no. 8, pp. 5097-5108, 2015. crossref(new window)

S. H. Bae and Y. S. Lee, “Implementation of a high-performance touch controller and differential sensing circuit,” International Journal of Computer and Information Technology, vol. 3, no. 6, pp. 1177-1180, 2014.

I. Seo and H. Kim, “Dual sensing with voltage shifting scheme for high sensitivity touch screen detection,” Journal of the Institute of Electronics and Information Engineers, vol. 52, no. 4, pp. 71-79, 2015. crossref(new window)

J. H. Yang, S. C. Jung, Y. S. Son, S. T. Ryu, and G. H. Cho, “A noise-immune high-speed readout circuit for in-cell touch screen panels,” IEEE Transactions on Circuits and Systems I, vol. 60, no. 7, pp. 1800-1809, 2013. crossref(new window)

J. H. Yang, S. H. Park, J. M. Choi, H. S. Kim, C. B. Park, S. T. Ryu, and G. H. Cho, "A highly noise-immune touch controller using Filtered-Delta-Integration and a charge-interpolation technique for 10.1-inch capacitive touch-screen panels," in Proceedings of 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC), San Francisco, CA, pp. 390-391, 2013.

J. Kim, M. G. A. Mohamed, and H. Kim, "Design of a frequency division concurrent sine wave generator for an efficient touch screen controller SoC," in Proceedings of 2015 IEEE International Symposium on Consumer Electronics (ISCE), Madrid, Spain, pp. 1-2, 2015.

D. M. Won and H. Kim, “Touch screen sensing circuit with rotating auto-zeroing offset cancellation,” Journal of Information and Communication Convergence Engineering, vol. 13, no. 3, pp. 189-196, 2015. crossref(new window)