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

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ID: 110883
2018
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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.
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Authors Chang-Ju Lee;Jong Kang Park;Canxing Piao;Han-Eol Seo;Jaehyuk Choi;Jung-Hoon Chun;Lee, Chang-Ju;Park, Jong Kang;Piao, Canxing;Seo, Han-Eol;Choi, Jaehyuk;Chun, Jung-Hoon;
Journal sensors
Year 2018
DOI
10.3390/s18113637
URL
https://www.mdpi.com/1424-8220/18/11/3637##related_content
Keywords
touch screen panel flexible display touch screen controller negative capacitance iq demodulation National Center for Biotechnology Information NCBI NLM MEDLINE pubmed abstract nih national institutes of health national library of medicine pmid:30373156 pmc6263714 doi:10.3390/s18113637 chang-ju lee jong kang park jung-hoon chun

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