The F+F capacitive touch screen is a functional tablet made up of two layers of conductive film, each coated with a layer of Indium tin oxide, and the outermost layer of the touch screen is a protective glass cover. When we touch the sensor screen with our fingers, the human body's electric field makes the finger and the surface of the touch screen form a coupling capacitor, which is a direct conductor for high frequency current The finger then draws a small current from the contact. This current flows from the electrodes on the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the fingers to the corners.
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