Fully Differential Touch Screen Controller with Wide Input Dynamic Range for Thin Displays
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ID: 272564
2020
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Abstract
As today’s smartphone displays become thinner, the coupling capacitance between the display electrodes and touch screen panel (TSP) electrodes is increasing significantly. The increased capacitance easily introduces time-varying display signals into the TSP, deteriorating the touch performance. In this research, we demonstrate that the maximum peak display noise in the time domain is approximately 30% of the maximum voltage difference of the display grayscale through analysis of the structure and operation of displays. Then, to mitigate display noise, we propose a circuit solution that uses a fully differential charge amplifier with an input dynamic range wider than the maximum peak of the display noise. A test chip was fabricated using a 0.35 μm CMOS process and achieved a signal-to-noise ratio of 41 dB for a 6-mm-diameter metal pillar touch when display pulses with 5-V swing were driven at 100 kHz.
| Reference Key |
lee2020sensorsfully
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| Authors | Chang-Ju Lee;Jong Kang Park;Han-Eol Seo;Junho Huh;Jung-Hoon Chun;Lee, Chang-Ju;Park, Jong Kang;Seo, Han-Eol;Huh, Junho;Chun, Jung-Hoon; |
| Journal | sensors |
| Year | 2020 |
| DOI |
10.3390/s20030837
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