Applying electric field sensing to human-computer interfaces
CHI '95 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
SmartSkin: an infrastructure for freehand manipulation on interactive surfaces
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
TUIC: enabling tangible interaction on capacitive multi-touch displays
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
CapWidgets: tangile widgets versus multi-touch controls on mobile devices
CHI '11 Extended Abstracts on Human Factors in Computing Systems
Clip-on gadgets: expanding multi-touch interaction area with unpowered tactile controls
Proceedings of the 24th annual ACM symposium on User interface software and technology
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Tangible remote controllers for wall-size displays
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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Capacitive multi-touch displays are not designed to detect passive objects placed on them-in fact, these systems usually contain filters to actively reject such touch 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, they are detected reliably even when no user is touching them, and they do not require internal electrical or software modifications of the touch display or its driver. We show the results from testing PUCs on 17 different off-the-shelf capacitive touch display models, and provide initial technical design recommendations.