NDLI: Mutual Capacitive Sensing Touch Screen Controller for Ultrathin Display with Extended Signal Passband Using Negative Capacitance

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Mutual Capacitive Sensing Touch Screen Controller for Ultrathin Display with Extended Signal Passband Using Negative Capacitance

Content Provider	Semantic Scholar
Author	Lee, Chang-Ju Park, Jong Kang Piao, Canxing Seo, Han-Eol Choi, Jaehyuk Chun, Jung-Hoon
Copyright Year	2018
Abstract	Flexible and thin displays for smart devices have a large coupling capacitance between the sensor electrode of the touch screen panel (TSP) and the display electrode. This increased coupling capacitance limits the signal passband to less than 100 kHz, resulting in a significant reduction in the received signal, with a driving frequency of several hundred kilohertz used for noise avoidance. To overcome this problem, we reduced the effective capacitance at the analog front-end by connecting a circuit with a negative capacitance in parallel with the coupling capacitance of the TSP. In addition, the in-phase and quadrature demodulation scheme was used to address the phase fluctuation between the signal and the clock during demodulation. We fabricated a test chip using the 0.35 µm CMOS process and obtained a signal-to-noise ratio of 43.2 dB for a 6 mm diameter metal pillar touch input.
Starting Page	114
Ending Page	115
Page Count	2
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://doi.org/10.3390/s18113637
PubMed reference number	30373156v1
DOI	10.3390/s18113637
Journal	Sensors
Volume Number	18
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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