Browse > Article
http://dx.doi.org/10.5573/ieie.2015.52.4.062

A Fast Sensing Method using Concurrent Driving and Sequential Sensing for Large Capacitance Touch Screens  

Mohamed, Mohamed G.A. (School of Electrical Engineering and Computer Science, Chungbuk National University)
Kim, HyungWon (School of Electrical Engineering and Computer Science, Chungbuk National University)
Cho, Tae-Won (School of Electrical Engineering and Computer Science, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.52, no.4, 2015 , pp. 62-70 More about this Journal
Abstract
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.
Keywords
Touch screen; Mutual-Capacitive; Touch Screen Controller; Multi-touch;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 I. Seo, T. W. Cho, H. W. Kim, H. G. Jang, S. W. Lee, "Frequency Domain Concurrent Sensing Technique for Large Touch Screen Panels", in Proc. of IEEK Fall Conference 2013, Seoul, Korea, pp.55-58, Korea Univ, Nov. 2013.
2 U. Y. Jang, H. W. Kim, T. W. Cho, H. G. Jang, S. W. Lee, "Architecture of Multi Purpose Touch Screen Controller with Self Calibration Scheme", in Proc. of IEEK Fall Conference 2013, Seoul, Korea, pp.162-166, Nov. 2013.
3 G. Barrett and R. Omote, "Projected-Capacitive Touch Technology," Information Display, Vol. 26, No. 3, pp. 16-21, March 2010.
4 K. Lim, K. S. Jung, C. S. Jang, J. S. Baek, and I. B. Kang, "A Fast and Energy Efficient Single-Chip Touch Controller for Tablet Touch Applications," Journal of Display Technology, Vol. 9, no. 7, pp. 520-526, July 2013.   DOI   ScienceOn
5 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, Jan. 2015.   DOI   ScienceOn
6 Y. H. Tai, H. L. Chiu, and L. S. Chou, "Large-Area Capacitive Active Touch Panel Using the Method of Pulse Overlapping Detection," Journal of Display Technology, Vol. 9, no. 3, pp. 170-175, March 2013.   DOI   ScienceOn
7 M.G.A. Mohamed. H. W. Kim, and T. W. Cho, "Efficient Multi-Touch Detection Algorithm for Large Touch Screen Panels," IEIE Transactions on Smart Processing and Computing, Vol. 3, no. 4, pp. 246-250, August 2014.   DOI   ScienceOn
8 I. Seo, U. Jang, M.G.A. Mohamed, T. W. Cho, H. W. Kim, H. K. Chang and S. Lee. "Voltage Shifting Double Integration Circuit for High Sensing Resolution of Large Capacitive Touch Screen Panels," in Proc. of The 18th IEEE International Symposium on Consumer Electronics (ISCE), Jeju, Korea, June 2014.
9 J. H. Yang, S. H. Park, J. Y. Jeon, H. S. Kim, C. B. Park, J. C. Lee, J. W. Kim and G. H. Cho, "A High-SNR Area-Efficient Readout Circuit using a Delta-Integration Method for Capacitive Touch Screen Panels," in Proc. of SID Symposium Digest of Technical Papers, Vol. 43, No. 1, pp. 1570-1573, June 2012.
10 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.   DOI   ScienceOn
11 K. D. Kim, S. H. Byun, Y. K. Choi, et al., "A capacitive touch controller robust to display noise for ultrathin touch screen displays," in Proc. of IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC), pp. 116-117, San Francisco, USA, Feb. 2012.
12 H. Shin, S. Ko, H. Jang, I. Yun, and K. Lee, "A 55dB SNR with 240Hz frame scan rate mutual capacitor 30${\times}$24 touch-screen panel read-out IC using code-division multiple sensing technique," in Proc. of IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC), pp. 388-389, San Francisco, USA, Feb. 2013.
13 M.G.A. Mohamed, U. Jang., I. Seo., H. W. Kim, T. W. Cho, H. K. Chang and S. Lee. "Efficient algorithm for accurate touch detection of large touch screen panels," in Proc. of The 18th IEEE International Symposium on Consumer Electronics (ISCE), Jeju, Korea, June 2014.
14 H. Ma, S. Heo, J. J. Kim and F. Bien, "Algorithm for improving SNR using high voltage and differential Manchester code for capacitive touch screen panel," Electronics Letters, Vol. 50, no. 24, pp. 1813-1815, Dec. 2014.   DOI   ScienceOn
15 G. Choi, M.G.A. Mohamed, and H. W. Kim, "Distributed Architecture of Touch Screen Controller SoC for Large Touch Screen Panels," in Proc. of International SoC Design Conference, Jeju, Korea, Nov. 2014.