Effects of Distributed Friction Actuation During Sliding Touch

TL;DR

This study investigates how spatial distribution of friction on flat touchscreens can create new tactile sensations by examining skin deformation and pattern-dependent shearing during sliding interactions.

Contribution

It introduces a method to apply spatial friction feedback on touchscreens, enabling new tactile illusions and expanding the range of sensations beyond traditional friction modulation.

Findings

Sequential friction changes cause minimal skin deformation.

Distributed friction patterns induce pattern-dependent skin shearing.

Spatial friction modulation can create novel tactile illusions.

Abstract

Friction modulation allows for a range of different sensations and textures to be simulated on flat touchscreens, yet is largely unable to render fundamental tactile interactions such as path following or shape discrimination due to lack of spatial force distribution across the fingerpad. In order to expand the range of sensations rendered via friction modulation, in this paper we explore the possibility of applying spatial feedback on the fingerpad via differing friction forces on flat touchscreens. To this end, we fabricated six distinct flat surfaces with different spatial distributions of friction and observed deformation of the fingerpad skin in response to motion along these physical samples. In our study, friction changes that occur sequentially along the sliding direction introduced little transitory spatial warping such as compression or stretching to the fingerpad, suggesting limited perceptual differences in comparison to 'classic' friction modulation. Distributing friction across the direction of motion, however, showed pattern-dependent shearing of the fingertip skin, opening avenues for new sensations and illusions heretofore unachievable on flat touchscreen surfaces.