Measuring Visio-Tactile threshold for Visio-Tactile Projector

This paper proposes a new device, Visio-Tactile Projector (VT Projector). VT Projector is a projector which can project both visual image and tactile stimulation on human skin at the same time. For the design or applications of VT Projector, we measured Visio-Tactile threshold (VTT) in three movement patterns and two vibration frequencies by constant method. VTT is the distance on the skin that is required for people to recognize the difference of two stimulated points between projected visual point image and a tactile stimulation. The results showed the VTT is about 10 to 13mm regardless of the stimulate pattern.