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after 2006

GelTouch: Localized Tactile Feedback Through Thin, Transparent Programmable Gel
Citation key miru15
Author Miruchna, V. and Walter, R. and Lindlbauer, D. and Lehmann, M. and von Klitzing, R. and Müller, J.
Pages 3-10
Year 2015
ISBN 978-1-4503-3779-3
DOI 10.1145/2807442.2807487
Journal User Interface Software and Technology Symposium 2015
Abstract We present GelTouch, a gel-based layer that can selectively transition between soft and stiff to provide tactile multi-touch feedback. It is flexible, transparent when not activated, and contains no mechanical, electromagnetic, or hydraulic components, resulting in a compact form factor (a 2mm thin touchscreen layer for our prototype). The activated areas can be morphed freely and continuously, without being limited to fixed, predefined shapes. GelTouch consists of a poly(N-isopropylacrylamide) gel layer which alters its viscoelasticity when activated by applying heat (>32 C). We present three different activation techniques: 1) Indium Tin Oxide (ITO) as a heating element that enables tactile feedback through individually addressable taxels; 2) predefined tactile areas of engraved ITO, that can be layered and combined; 3) complex arrangements of resistance wire that create thin tactile edges. We present a tablet with 6x4 tactile areas, enabling a tactile numpad, slider, and thumbstick. We show that the gel is up to 25 times stiffer when activated and that users detect tactile features reliably (94.8%).
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