The use of mechanical vibrotactile actuation with current electromagnetic or piezoelectric actuators faces an inevitable conflict: it can be difficult for users to perceive weak vibrations with low amplitude, and high strength vibrations with high amplitude can be rated as unpleasant for delivering too strong a force against users’ fingertips (Brown et al., 2005 and Bau et al., 2010). In addition, users can easily become finger-fatigued when tapping repeatedly on the same spot of hard-surface glass display with the same finger postures to ensure that the correct buttons were pressed (Hale and Stanney, 2004). Another problem is that the display using mechanical vibrations is limited in its ability to create rich tactile sensation for users who want to explore its surface texture by active rather than passive touch. In other words, the tactile sensation of mechanical vibrations is created indirectly through vibration of the entire touch surface, which transfers the vibration induced by electrostatic force on an intermediate object to the fingertips, thereby offering tactile feedback to the non-moving fingers pressing against the surface of the screen. In contrast, electrovibration (Mallinckrodt et al., 1953 and Bau et al., 2010) can create a rubbery sensation by modulating friction between the surface and skin of the moving fingers, thereby directly actuating the fingers.