Presentation of button repulsive sensations on touch screen using SMA wires

A touch screen is an electronic visual display that can detect the presence and location of a touch within the display area surface. The term generally refers to stressing the display area of the device with a finger of a hand. A common type of touch screen only receives a user´s finger stress as an input. However, the user himself is not able to feel the presence of the object displayed on the screen such as a displayed button image on the screen. This paper introduces the development of button repulsive sensations displayed by the utilization of micro-vibrations generated from a shape memory alloy wire on a touch screen interface as a tactile display actuator.