Capacitive touch screen is a piece of 2 layer of compound glass with double side transparent conductive coating that conducts a continuous electrical current across the sensor.

There is electrode pattern printed along the edges distributes a low voltage field over the conductive layer.

The human body is also an electrical device which has stored electrons and therefore also exhibits capacitance.

When a finger touches the screen and draws a minute amount of current to the point of contact, creating a voltage drop.

The current flow from each corner is proportional to the distance to the touch point.

During a touch, capacitance forms between the finger and the sensor grid. The touch location is calculated from
the changing electrical characteristics of the sensor grid.

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