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What is the structure of a capacitive touch screen?

by:Toponetech     2021-10-27
With the continuous development and innovation of science and technology, people’s living standards are getting higher and higher, touch screens have also brought a lot of convenience to people’s work and life, and their applications in the market are also very hot. It can be seen in various fields. Figure. The following editor will explain the structure of the capacitive touch screen. The basic structure of the capacitive touch screen is: the substrate is a single-layer plexiglass, a layer of transparent conductive film is uniformly forged on the inner and outer surfaces of the plexiglass, and a narrow and long cone is placed on the four corners of the transparent conductive film on the outer surface. electrode. Its working principle is: when a finger touches the capacitive touch screen, a high-frequency signal is connected to the working surface. At this time, the finger and the working surface of the touch screen form a coupling capacitor, which is equivalent to a conductor, because there are high-frequency signals on the working surface. At the touch point, a small current is drawn. This small current flows from the electrodes on the four corners of the touch screen. The current flowing through the four electrodes is proportional to the linear distance from the finger to the four corners. By calculation, the coordinate value of the contact point can be obtained. The capacitive touch screen can be simply viewed as a screen composed of four layers of 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 fourth innermost layer It is also a conductive layer. The innermost conductive layer is the shielding layer, which plays the role of shielding the internal electrical signals. The middle conductive layer is the key part of the entire touch screen. There are direct leads on the four corners or sides to detect the position of the touch point. Rongguan touch screen professional manufacturer customized, has rich industry experience, meticulous workmanship, high quality, strict quality management system, perfect after-sales service. Welcome to inquire:.
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