MudPad: localized tactile feedback on touch surfaces. Jansen, Y., Karrer, T., & Borchers, J. In Proceedings of the 23nd Annual ACM Symposium on User Interface Software and Technology, pages 385–386, 2010.
MudPad: localized tactile feedback on touch surfaces [link]Paper  doi  abstract   bibtex   
We present MudPad, a system that is capable of localized active haptic feedback on multitouch surfaces. An array of electromagnets locally actuates a tablet-sized overlay con- taining magnetorheological (MR) fluid. The reaction time of the fluid is fast enough for realtime feedback ranging from static levels of surface softness to a broad set of dynamically changeable textures. As each area can be addressed individ- ually, the entire visual interface can be enriched with a multi- touch haptic layer that conveys semantic information as the appropriate counterpart to multi-touch input.
@inproceedings{jansen_mudpad:_2010,
	title = {{MudPad}: localized tactile feedback on touch surfaces},
	isbn = {978-1-4503-0462-7},
	url = {http://doi.acm.org/10.1145/1866218.1866232},
	doi = {10.1145/1866218.1866232},
	abstract = {We present MudPad, a system that is capable of localized active haptic feedback on multitouch surfaces. An array of electromagnets locally actuates a tablet-sized overlay con- taining magnetorheological (MR) fluid. The reaction time of the fluid is fast enough for realtime feedback ranging from static levels of surface softness to a broad set of dynamically changeable textures. As each area can be addressed individ- ually, the entire visual interface can be enriched with a multi- touch haptic layer that conveys semantic information as the appropriate counterpart to multi-touch input.},
	booktitle = {Proceedings of the 23nd {Annual} {ACM} {Symposium} on {User} {Interface} {Software} and {Technology}},
	author = {Jansen, Yvonne and Karrer, Thorsten and Borchers, Jan},
	year = {2010},
	keywords = {haptic i/o, multitouch, tactile feedback},
	pages = {385--386}
}
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