Surface capacitive touch technology is one of the most established touch interfaces available today. Pioneered by MicroTouch Systems in the mid-1980s, surface capacitive technology is the preferred solution for public-access applications in contaminant-prone environments.
Dispersive Signal Technology is 3M's proprietary implementation of bending wave technology, which 3M has enhanced to optimize real-time touch response for large-screen public-access applications.
Dispersive Signal Technology's theory of operation is based on piezos, mounted in each corner of the glass sensors, collecting and converting the bending wave energy created by a touch into digital signals that are processed by proprietary algorithms residing in the touch controller.
Tactile feedback technology provides touch screen users with the "sensation" that they are actually depressing traditional mechanical buttons.
The tactile feedback effect is created when the user simultaneously sees a video button depress, hears an audio file of the mechanical "click" and feels a vibration in the touch screen's glass surface. The user instinctively interprets the combination of these three sensations as depressing a mechanical button, when actually they're touching a solid glass surface.