Adding tactile reaction to hologram

In this paper, a hologram with tactile reactions is presented. The developed system consists of three components; a holographic display, a hand tracker, and a tactile display. The tactile display, which is our original device, produces force on user´s bare hand without any contact by using radiation pressure of airborne ultrasound. It adds the sense of touch to optical images floating in mid-air. In order to represent the feeling of impact, some improvements are added to the tactile display. As a result, the tactile display has an ability to produce up to 4.8 gf without air flow.