Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/147166
Title: Capacitive touch panel with low sensitivity to water drop employing mutual-coupling electrical field shaping technique
Authors: Zhong, Longjie
Lai, Xinquan
Xu, Donglai
Liao, Xinqin
Yang, Chuanshi
Fang, Zhongyuan
Zheng, Yuanjin
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Zhong, L., Lai, X., Xu, D., Liao, X., Yang, C., Fang, Z. & Zheng, Y. (2019). Capacitive touch panel with low sensitivity to water drop employing mutual-coupling electrical field shaping technique. IEEE Transactions On Circuits and Systems I: Regular Papers, 66(4), 1393-1404. https://dx.doi.org/10.1109/TCSI.2018.2879410
Project: NRF-CRP11-2012-01
Journal: IEEE Transactions on Circuits and Systems I: Regular Papers
Abstract: This paper proposes a novel method to reduce the water interference on the touch panel based on mutual-capacitance sensing in human finger detection. As the height of a finger (height >10 mm) is far larger than that of a water-drop (height <1 mm), if the density distribution of electrical field of the touch panel's sensing cell is high in the high-height space (height >10 mm) and low in the low-height space (height <1 mm), the sensing cell can be designed to distinguish the finger from the water-drop. To achieve this density distribution of the electrical field, the mutual-coupling electrical field shaping (MEFS) technique is employed to build the sensing cell. The drawback of the MEFS sensing cell is large parasitic capacitance, which can be overcome by a readout IC with low sensitivity to parasitic capacitance. Experiments show that the output of the IC with the MEFS sensing cell is 1.11 V when the sensing cell is touched by the water-drop and 1.23 V when the sensing cell is touched by the finger, respectively. In contrast, the output of the IC with the traditional sensing cell is 1.32 and 1.33 V when the sensing cell is touched by the water-drop and the finger, respectively. This demonstrates that the MEFS sensing cell can better distinguish the finger from the water-drop than the traditional sensing cell does.
URI: https://hdl.handle.net/10356/147166
ISSN: 1549-8328
DOI: 10.1109/TCSI.2018.2879410
Rights: © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: https://doi.org/10.1109/TCSI.2018.2879410.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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