A Compact Low-Power Shunt Proximity Touch Sensor and Readout for Haptic Function



Lee, Yong-Min;Lee, Kye-Shin;Jeong, Taikyeong

  • 투고 : 2015.07.04
  • 심사 : 2016.03.07
  • 발행 : 2016.06.30


This paper presents a compact and low-power on-chip touch sensor and readout circuit using shunt proximity touch sensor and its design scheme. In the proposed touch sensor readout circuit, the touch panel condition depending on the proximity of the finger is directly converted into the corresponding voltage level without additional signal conditioning procedures. Furthermore, the additional circuitry including the comparator and the flip-flop does not consume any static current, which leads to a low-power design scheme. A new prototype touch sensor readout integrated circuit was fabricated using complementally metal oxide silicon (CMOS) $0.18{\mu}m$ technology with core area of $0.032mm^2$ and total current of $125{\mu}A$. Our measurement result shows that an actual 10.4 inches capacitive type touch screen panel (TSP) can detect the finger size from 0 to 1.52 mm, sharply.


Shunt proximity touch sensor;touch screen panel (TSP);readout circuit


  1. 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, pp. 1027-1032, Aug. 2011 https://doi.org/10.1109/TCE.2011.6018851
  2. H. J. Lee, J. A. Park, "Touch Play Pool: Touch Gesture Interaction for Mobile Multifunction Devices," in Proceedings of IEEE International ICCE Conference, pp. 291-292, Jan. 2012
  3. [Online] Quantum Research Group, "DC Specification," $QProx^{TM}$ QT113 Data Sheet, 2004.
  4. R. N. Aguilar and G. M. Meijer, "Fast Interface Electronics for a Resistive Touch-screen," in Proceedings of IEEE Sensors, vol. 2, pp. 1360-1363, Jun. 2002 https://doi.org/10.1109/ICSENS.2002.1037318
  5. P. Rodriguez, A.V. Timbus, R. Teodorescu, and M. Liserre, "Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults," IEEE Transactions on Industrial Electronics, vol. 54 , no. 5, pp. 2583-2592, Aug. 2007 https://doi.org/10.1109/TIE.2007.899914
  6. L. Bin, T. W. Rondeau, J. H. Reed, and C. W. Bostian, "Analog-to-digital converters," IEEE Signal Processing Magazine, vol. 22, no. 6, pp. 69-77, Nov. 2005 https://doi.org/10.1109/MSP.2005.1550190
  7. R. P. Fisk, "A Calibration-Free Low-Cost Process-Compensated Temperature Sensor in 130 nm CMOS," IEEE Sensors Journal, vol. 11, no. 12, pp. 3316-3329, Dec. 2011 https://doi.org/10.1109/JSEN.2011.2158093
  8. S. Qiu, Y. Huang, X. He, Z. Sun, P. Liu, and C. Liu, "A Dual-mode Proximity Sensor with Integrated Capacitive and Temperature Sensing Units," Measurement Science and Technology, vol. 26, no. 10, 2015
  9. T. Jeong, "Design and Modeling of Sensor Behavior for Improving Sensitivity and Performance," Measurement, vol. 62, pp. 230-236, 2015 https://doi.org/10.1016/j.measurement.2014.11.018
  10. X. Zhang, M. Liu, H. Chen, C. Zhang, and Z. Wang, "A wide Dynamic Range and Fast Update Rate Integrated Interface for Capacitive Sensors Array," in Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS 2012), pp. 2961-2964, May 2012


연구 과제 주관 기관 : NRF of Korea