HoliBraille: Multipoint vibrotactile feedback on mobile devices

Hugo Nicolau, Kyle Montague (Lead / Corresponding author), Tiago Guerreiro (Lead / Corresponding author), André Rodrigues, Vicki L. Hanson

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

17 Citations (Scopus)


We propose HoliBraille, a system that enables Braille input and output on current mobile devices. We use vibrotactile motors combined with dampening materials in order to actuate directly on users' fingers. The prototype can be attached to current capacitive touchscreen devices enabling multipoint and localized feedback. HoliBraille can be leveraged in several applications including educational tools for learning Braille, as a communication device for deaf-blind people, and as a tactile feedback system for multitouch Braille input. We conducted a user study with 12 blind participants on Braille character discrimination. Results show that HoliBraille is effective in providing localized feedback; however, character discrimination performance is strongly related with number of simultaneous stimuli. We finish by discussing the obtained results and propose future research avenues to improve multipoint vibrotactile perception.

Original languageEnglish
Title of host publicationW4A 2015
Subtitle of host publicationProceedings of the 12th Web for All Conference
Place of PublicationNew York
PublisherAssociation for Computing Machinery
Number of pages4
ISBN (Print)9781450333429
Publication statusPublished - 18 May 2015
Event12th International Web for All Conference, W4A 2015 - Florence, Italy
Duration: 18 May 201520 May 2015


Conference12th International Web for All Conference, W4A 2015


  • Blind
  • Braille
  • Input
  • Multitouch
  • Output
  • Vibrotactile

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    Nicolau, H., Montague, K., Guerreiro, T., Rodrigues, A., & Hanson, V. L. (2015). HoliBraille: Multipoint vibrotactile feedback on mobile devices. In W4A 2015 : Proceedings of the 12th Web for All Conference [30] Association for Computing Machinery. https://doi.org/10.1145/2745555.2746643