PUCs demo: detecting transparent, passive untouched capacitive widgets

Authors:
Simon Voelker;Kosuke Nakajima;Christian Thoresen;Yuichi Itoh;Kjell Ivar Øvergård;Jan Borchers
Affiliations:
RWTH Aachen University, Aachen, Germany;Osaka University, Suita, Japan;Vestfold University College, Tønsberg, Norway;Osaka University, Suita, Japan;Vestfold University College, Tønsberg, Norway;RWTH Aachen University, Aachen, Germany
Venue:
Proceedings of the 2013 ACM international conference on Interactive tabletops and surfaces
Year:
2013

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Abstract

Capacitive multi-touch displays are designed to detect touches from fingers that often change the location. This is quite the opposite of our goal: detect passive objects placed on them. In fact, these systems usually contain filters to actively reject such inactive input data. We present a technical analysis of this problem and introduce Passive Untouched Capacitive Widgets (PUCs). Unlike previous approaches, PUCs do not require power, they can be made entirely transparent, and they do not require internal electrical or software modifications. Most importantly they are detected reliably even when no user is touching them.