SmartSkin: an infrastructure for freehand manipulation on interactive surfaces
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Optical sensors embedded within AMLCD panel: design and applications
ACM SIGGRAPH 2007 emerging technologies
ThinSight: versatile multi-touch sensing for thin form-factor displays
Proceedings of the 20th annual ACM symposium on User interface software and technology
An LED-based multitouch sensor for LCD screens
Proceedings of the fourth international conference on Tangible, embedded, and embodied interaction
LightWave: using compact fluorescent lights as sensors
Proceedings of the 13th international conference on Ubiquitous computing
ZeroTouch: an optical multi-touch and free-air interaction architecture
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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Current solutions for enabling touch interaction on existing non-touch LCD screens require adding additional sensors to the interaction surface. We present uTouch, a system that detects and classifies touches and hovers without any modification to the display, and without adding any sensors to the user. Our approach utilizes existing signals in an LCD that are amplified when a user brings their hand near or touches the LCD's front panel. These signals are coupled onto the power lines, where they appear as electromagnetic interference (EMI) which can be sensed using a single device connected elsewhere on the power line infrastructure. We validate our approach with an 11 user, 8 LCD study, and demonstrate a real-time system.