31.2: Eliminating Ghost Touches on a Self‐Capacitive Touch‐Screen
Philippe Coni, J. N. Perbet, Yves Sontag, Jean Christophe Abadie · SID Symposium Digest of Technical Papers · 2012
Abstract When two or more touches are detected on a self‐capacitive touch‐screen, positional ambiguities known as “ghost” touches are created. A novel method of distinguishing between real and “ghost” touches is described. Experimental results for dual‐touch give an SNR of over 55 dB, appropriate for secured touch detection in severe environments such as avionics.