What Are The Basic Structures Of Capacitive Touch Screens?

1. The basic structure of a capacitive touch screen is: the substrate is a single-layer organic glass, and a layer of transparent conductive film is uniformly forged on the inner and outer surfaces of the organic glass. A narrow electrode is tapered on the four corners of the transparent conductive film on the outer surface.
2. The working principle is that when a finger touches a capacitive touch screen, a high-frequency signal is connected to the working surface. At this time, the finger forms a coupling capacitor with the working surface of the touch screen, which is equivalent to a conductor. Because there is a high-frequency signal on the working surface, the finger absorbs a small current at the touch point when touching, which flows out from the electrodes at the four corners of the touch screen, The current flowing through the four electrodes is proportional to the linear distance from the fingers to the four corners. The controller calculates the coordinate values of the contact points by calculating the proportion of the four currents.
3. A capacitive touch screen can be simply seen as a screen body composed of four composite screens: the outermost layer is a glass protective layer, followed by a conductive layer, the third layer is a non-conductive glass screen, and the innermost fourth layer is also a conductive layer. The innermost conductive layer is the shielding layer, which plays a role in shielding internal electrical signals. The middle conductive layer is a key part of the entire touch screen, with direct leads on the four corners or edges, responsible for detecting the position of touch points.