High-SNR Capacitive Multi-Touch Sensing Technique for AMOLED Display Panels

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A mutual-capacitive multi-touch sensing technique is presented, especially for ultra-thin active-matrix organic light-emitting diode (OLED) display panels. The proposed scheme recognizes touch positions by detecting LC oscillation frequency shift. The signal feedback to the common cathode electrode of OLEDs cancels out the effects of parasitic coupling capacitances. In addition, the ground-floating-based scanning method enables a multi-touch function. The proposed touch sensor was implemented in a 0.35-mu m CMOS process. Simulations were performed in model of 3.97-in on-cell-type TSP with various noise signals gathered by actual measurements. The proposed sensing technique achieves 68.9- and 61.6-dB signal-to-noise ratios with 6- and 2-mm diameter metal pillars, respectively.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2016-02
Language
English
Article Type
Article
Citation

IEEE SENSORS JOURNAL, v.16, no.4, pp.859 - 860

ISSN
1530-437X
DOI
10.1109/JSEN.2015.2496198
URI
http://hdl.handle.net/10203/251861
Appears in Collection
EE-Journal Papers(저널논문)
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