Abstract
AbstractTouchless user interfaces enable people to interact with digital services and information without physically touching an input device. There are numerous benefits to touchless interaction (including convenience, hygiene and the potential for more expressive input), and sensing technologies have advanced significantly in recent years. As a result, touchless user interfaces have been adopted on a wider scale across a variety of application areas, e.g. automotive, digital signage and gaming. However, usability remains a key concern; touchless gesture input poses several interaction challenges, many related to uncertainty and the inherent loss of tactile cues. Ultrasound haptic feedback has shown promise in helping users overcome such interaction challenges, restoring the missing sense of touch and closing the feedback loop for effective haptic interaction. This chapter explores how ultrasound haptic feedback has been used in touchless user interface design and presents design patterns used by industry and academia alike.
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