When a finger touches the metal layer, a coupling capacitor is formed by the human body's electric field and the surface of the touch screen. The human body absorbs a small amount of current, and the controller calculates the touch position by measuring the current flowing through the electrodes at the four corners.
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When a finger touches the metal layer, a coupling capacitor is formed by the human body's electric field and the surface of the touch screen. The human body absorbs a small amount of current, and the controller calculates the touch position by measuring the current flowing through the electrodes at the four corners.
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