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dc.contributor.authorZhong, Longjieen_US
dc.contributor.authorLai, Xinquanen_US
dc.contributor.authorXu, Donglaien_US
dc.contributor.authorLiao, Xinqinen_US
dc.contributor.authorYang, Chuanshien_US
dc.contributor.authorFang, Zhongyuanen_US
dc.contributor.authorZheng, Yuanjinen_US
dc.identifier.citationZhong, 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.
dc.description.abstractThis 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.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofIEEE Transactions on Circuits and Systems I: Regular Papersen_US
dc.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:
dc.subjectEngineering::Electrical and electronic engineeringen_US
dc.titleCapacitive touch panel with low sensitivity to water drop employing mutual-coupling electrical field shaping techniqueen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.researchVIRTUS, IC Design Centre of Excellenceen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsWater Interferenceen_US
dc.subject.keywordsMutual Capacitanceen_US
dc.description.acknowledgementThis work was supported in part by the National Natural Science Foundation of China (NSFC) under Grant 61771363, in part by the China Scholarship Council (CSC) under Grant 201706960042, and in part by the National Research Foundation of Singapore under Grant NRF-CRP11-2012-01.en_US
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