With the development of technology, touch screen technology is constantly improving. In daily life, various touch screens are often used, but do you know what the common types of Siemens touch screen are? This article will take you to understand the common types of Siemens touch screen product.
According to the working principle of the touch screen and the medium of information transmission, usually we divide the touch screen into four types as following.
This kind of touch screen uses pressure sensing for control. The main part is a resistive film screen that fits well with the surface of the display. This is a multi-layer composite film. It uses a glass or hard plastic plate as the base layer and is coated with a layer of transparent oxide metal (transparent conductive Resistance) conductive layer, covered with a layer of hardened outer surface and smooth and anti-scratch plastic layer. Its inner surface is also coated with a layer of coating, and there are many small (less than 1/1000 inch) transparent between them. The isolation point separates and insulates the two conductive layers. When a finger touches the screen, the two conductive layers are in contact at the touch point, and the resistance changes, so signals are generated in the X and Y directions, and then they are sent to the touch screen controller. The controller detects this contact and calculates the position of (X, Y), and then operates according to the way of simulating a mouse. This is the most basic principle of resistive technology touch screens.
The four sides of the capacitive technology touch screen are plated with long and narrow electrodes, and a low-voltage AC electric field is formed inside. A transparent film layer is attached to the touch screen, which is a special metal conductive substance. When the user touches the capacitive screen, the user's finger and the working surface form a coupling capacitor. Because the working surface is connected to a high-frequency signal, the finger will draw a small current from the electrodes on the four corners of the screen. In theory, the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller can obtain the position of the contact point by accurately calculating the ratio of the four currents.
The four sides of the infrared touch screen are arranged with infrared emitting tubes and infrared receiving tubes, which form a horizontal and vertical cross infrared matrix in one-to-one correspondence. When the user touches the screen, the finger will block the two infrared rays passing through the position, and the controller can determine the position of the touch point through calculation.
Surface acoustic wave is a kind of ultrasonic wave, which is a mechanical energy wave that spreads shallowly on the surface of a medium such as glass or metal rigid materials. Through the wedge-shaped triangular base, directional, small-angle surface acoustic wave energy emission can be achieved. Surface acoustic wave is stable, easy to analyze, and has very sharp frequency during transverse wave transmission. In recent years, it has developed rapidly in applications such as non-destructive flaw detection, radiography, and wave ejectors etc.
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