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The basic structure of capacitive touch screen
Dec 14, 2017

The basic structure of the capacitive touch screen is: the substrate is a single layer of plexiglass, respectively, the inner and outer surfaces of the plexiglass are forged a layer of transparent conductive film, respectively, on the outer surface of the four corners of the transparent conductive film cone on a long electrode. Its working principle is: when the finger touches the capacitive touch screen, the high frequency signal is connected to the working face. At this time, the finger and the touch screen face form a coupling capacitor, which is equivalent to the conductor. Because the working face has a high frequency signal, when the finger touches A small current is drawn away from the touch point. The small current flows from the electrodes on the four corners of the touch screen respectively. The current flowing through the four electrodes is proportional to the straight line distance from the finger to the four corners. The controller compares the four current proportional Calculate, you can come to the contact point coordinates.

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