Friction measurements on a large area TPaD

Research output: Chapter in Book/Report/Conference proceedingConference contribution

44 Scopus citations


We describe a variable friction haptic display on a large area of glass, and characterize its performance. The Large Area Tactile Pattern Display (LATPaD) uses modulation of surface friction created by ultrasonic vibration, as in previous smaller devices [8]. Unlike those, the LATPaD does not operate in the lowest resonant mode. As a consequence, the vibration amplitude varies across the surface of the LATPaD (being zero at nodal lines) and therefore the friction reduction effect varies spatially. In practice, the variation in friction reduction is less than might be expected, due to the finite extent of the finger pad. We measure friction over the surface for several mode shapes.

Original languageEnglish (US)
Title of host publication2010 IEEE Haptics Symposium, HAPTICS 2010
Number of pages4
StatePublished - May 31 2010
Event2010 IEEE Haptics Symposium, HAPTICS 2010 - Waltham, MA, United States
Duration: Mar 25 2010Mar 26 2010


Other2010 IEEE Haptics Symposium, HAPTICS 2010
Country/TerritoryUnited States
CityWaltham, MA


  • TPaD
  • Variable friction haptic display

ASJC Scopus subject areas

  • Artificial Intelligence
  • Human-Computer Interaction


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