Capacitive Touch Screen:
 
Capacitive touch screen are built with two parallel layers of ITO but, but unlike the old and cheap resistive touch panels, the ITO layers in a projected capacitive touch panel are sealed between two sheets of glass by an optically clear adhesive.
 

Structure & Operating Principle:

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 filed 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.

Advantages of G+G structure:

(1)High transmittance,>83%.

(2)Hard and anti-wear surface.The hardness is 6H.

(3)Excellent corrosion resistance.

(4)Sensitive touch and stable performance.

G+G means the structure of touch panel using Cover Glass + Sensor Glass. The Sensor Glass have

ITO coating so that it can be sensitive.