Contactless touch interface supporting blind touch interaction by aerial tactile stimulation

This paper proposes a contactless touch interface which supports blind touch interaction by the use of tactile stimulation. In the system users can interact with a touch screen without actual touch on it and get tactile feedback for the action. The components of this system are a special screen (Visuo-Acoustic Screen), a visual projector, an airborne ultrasound phased array for giving tactile stimulation by noncontact way and a pair of IR sensors for the finger detection. In this paper, we enable noncontact blind touch interaction by adding tactile feedback variation for notifying the finger location. We show the strategy for the blind touch and evaluate the efficacy.