LipNotif: Use of Lips as a Non-Contact Tactile Notification Interface Based on Ultrasonic ...
summary
LipNotif is a prototype that uses mid-air ultrasonic transducers to present focal tactile points to the lips, locating stimulation spots by facial landmarks plus a depth sensor and aiming at the lip valley. Two user studies show directional cues achieve average accuracy ±11.1° across a 120° horizontal range and that stronger intensity produces significantly more unpleasant and more excited affective responses. It requires no wearables and conveys direction and emotion via non-contact ultrasonic transducers targeted at a valley-shaped lip focal point.
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