Lip IO: Enabling Lips as both Input and Output Surface

Video figure for LipIO: Enabling Lips as both Input and Output This work was presented at the ACM CHI 2023 conference in Hamburg, Germany by Arata Jingu. This work was done in collaboration with Yudai Tanaka and Pedro Lopes at the University of Chicago s Human Computer Integration Lab. Abstract: We engineered LipIO, a novel device enabling the lips to be used simultaneously as an input and output surface. LipIO comprises two overlapping flexible electrode arrays: an outwardfacing array for capacitive touch and a lipfacing array for electrotactile stimulation. While wearing LipIO, users feel the interfaces state via lip stimulation and respond by touching their lip with their tongue or opposing lip. More importantly, LipIO provides colocated tactile feedback that allows users to feel where in the lip they are touchingthis is key to enabling eyes and handsfree interactions. Our three studies verified participants perceived electrotactile output on their lips and subsequent