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A Light-Driven Vibrotactile Actuator with a Polymer Bimorph Film for Localized Haptic Rendering
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- Authors
- Inwook Hwang, Hyeong Jun Kim, Seongcheol Mun, Sungryul Yun, Tae June Kang
- Issue Date
- 2021-02
- Citation
- ACS Applied Materials & Interfaces, v.13, no.5, pp.6597-6605
- ISSN
- 1944-8244
- Publisher
- American Chemical Society (ACS)
- Language
- English
- Type
- Journal Article
- Abstract
- A vibrotactile actuator driven by light energy is developed to produce dynamic stimulations for haptic rendering on a thin-film structure. The actuator is constructed by adopting a thermal bimorph membrane structure of poly(3,4-ethylenedioxythiophene) doped with p-toluenesulfonate (PEDOT-Tos) coated onto a polyethylene terephthalate (PET) film. Upon irradiation of near-infrared (NIR) light, the light energy absorbed at the PEDOT-Tos layer is converted into thermoelastic bending deformation due to the mismatch in coefficient of thermal expansion between PEDOT-Tos and PET. Since the light-induced deformation is reversible, spatially localized, and rapidly controllable with designed light signals, the proposed actuator can produce vibrotactile stimulation over 10 dB at arbitrary areas in the human-sensitive frequency range from 125 to 300 Hz using a low input power of μ2.6 mW mm-2, as compared with a complex electrical circuit and high input power needed to achieve such actuation performance. Together with its simple structure based on light-driven actuation, the advent of this actuator could open up new ways to achieve substantial advances in rendering textures at a flexible touch interface.
- KSP Keywords
- 4-Ethylenedioxythiophene(EDOT), Bending deformation, Coefficient of thermal expansion, Energy absorbed, Frequency Range, Haptic rendering, Light energy, Light-driven, Light-induced, Low input power, Membrane structures