Surface capacitance

In this basic technology, only one side of the insulator is coated with a conductive layer. A smallvoltageis applied to the layer, resulting in a uniform electrostatic field. When aconductor, such as a human finger, touches the uncoated surface, acapacitoris dynamically formed. The sensorscontrollercan determine the location of the touch indirectly from the change in thecapacitanceas measured from the four corners of the panel. As it has no moving parts, it is moderately durable but has limited resolution, is prone to false signals from parasiticcapacitive coupling, and needscalibrationduring manufacture. It is therefore most often used in simple applications such as industrial controls andkiosks.