NDLI: Algorithm for improving SNR using high voltage and differential Manchester code for capacitive touch screen panel

Content Provider	IET Digital Library
Author	Ma, Hyunggun Heo, Sanghyun Kim, Jae Joon Bien, Franklin
Abstract	An algorithm for a capacitive touch screen panel that can make the sum of the signal into ‘0’ for the use of high voltage is presented. The differential Manchester code is combined with the Walsh-Hadamard code to generate an input coded signal. Owing to the property of the differential Manchester code, the Moore-Penrose pseudoinverse matrix is employed to decode-mutual capacitance from the received signal. As only the variation between the un-touch and touch condition is detected at the receiver, a high-voltage input coded signal is used. Unlike a normal touch system, the decoded sensing capacitance in the proposed algorithm does not have an absolute value. Positive decoded capacitance is the un-touch condition and negative decoded capacitance is the touch condition. The simulated signal-to-noise ratio (SNR) of the proposed algorithm is 27.9 dB, which is 8.26 dB higher than SNR in not return to zero (NRZ).
Starting Page	1813
Ending Page	1815
Page Count	3
ISSN	00135194
Volume Number	50
e-ISSN	1350911X
Issue Number	Issue 24, Nov (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/50/24
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2014.2269
Journal	Electronics Letters
Publisher Date	2014-11-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Capacitance Capacitive Sensor Capacitive Touch Screen Panel Code Decoded Sensing Capacitance Differential Manchester Code Display Technology Hadamard Code High-voltage Input Coded Signal Input Coded Signal Generation Linear Algebra Matrix Inversion Modulation Moore–penrose Pseudoinverse Matrix Mutual Capacitance Decoding Negative Decoded Capacitance Not Return to Zero NRZ Numerical Analysis Received Signal Signal Processing And Detection Signal to Noise Ratio SNR Touch Sensitive Screens TSP Un-touch Condition Walsh Function Walsh–Hadamard Code WHC
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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