Ambient touch: designing tactile interfaces for handheld devices. Poupyrev, I., Maruyama, S., & Rekimoto, J. In Proceedings of the 15th annual ACM symposium on User interface software and technology, volume 4, pages 51–60, 2002.
Ambient touch: designing tactile interfaces for handheld devices [link]Paper  doi  abstract   bibtex   
This paper investigates the sense of touch as a channel for communicating with miniature handheld devices. We embedded a PDA with a TouchEngineTM a thin, miniature lower-power tactile actuator that we have designed specifically to use in mobile interfaces (Figure 1). Unlike previous tactile actuators, the TouchEngine is a universal tactile display that can produce a wide variety of tactile feelings from simple clicks to complex vibrotactile patterns. Using the TouchEngine, we began exploring the design space of interactive tactile feedback for handheld computers. Here, we investigated only a subset of this space: using touch as the ambient, background channel of interaction. We proposed a general approach to design such tactile interfaces and described several implemented prototypes. Finally, our user studies demonstrated 22\%\ faster task completion when we enhanced handheld tilting interfaces with tactile feedback.
@inproceedings{poupyrev_ambient_2002,
	title = {Ambient touch: designing tactile interfaces for handheld devices},
	volume = {4},
	isbn = {1-58113-488-6},
	url = {http://portal.acm.org/citation.cfm?id=571993},
	doi = {10.1145/571985.571993},
	abstract = {This paper investigates the sense of touch as a channel for communicating with miniature handheld devices. We embedded a PDA with a TouchEngineTM a thin, miniature lower-power tactile actuator that we have designed specifically to use in mobile interfaces (Figure 1). Unlike previous tactile actuators, the TouchEngine is a universal tactile display that can produce a wide variety of tactile feelings from simple clicks to complex vibrotactile patterns. Using the TouchEngine, we began exploring the design space of interactive tactile feedback for handheld computers. Here, we investigated only a subset of this space: using touch as the ambient, background channel of interaction. We proposed a general approach to design such tactile interfaces and described several implemented prototypes. Finally, our user studies demonstrated 22\{\%\} faster task completion when we enhanced handheld tilting interfaces with tactile feedback.},
	booktitle = {Proceedings of the 15th annual {ACM} symposium on {User} interface software and technology},
	author = {Poupyrev, Ivan and Maruyama, Shigeaki and Rekimoto, Jun},
	year = {2002},
	keywords = {mobile devices interfaces, tactile feedback},
	pages = {51--60}
}

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