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What are capacitive touch screens?
- Jun 27, 2018 -
Projected Capacitive Touch Panel-21.5 Inch

Capacitive touch screen technology works by using the human body's current induction. Capacitive touch screen is a four layer composite glass screen, the inner surface of the glass and laminated coated with a layer of ito, the outermost layer is a thin layer of silica glass coating, laminated ito coating as the working face, four corners raises four electrodes, inner ito for shield to ensure good working environment. When the fingers on the metal layer, the electric field due to the human body, the user and the touch screen surface formed by a coupling capacitance, for high frequency current, capacitance is directly conductor, so the fingers from the point of contact suck a small current. The current issue from the touch screen on the four corners of the electrode respectively, the four electrodes and the current is proportional to the finger to the four corners, the controller based on the four current ratio of precise calculation, it is concluded that the location of the touch point.

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