What is resistive touch screen

- Dec 13, 2018-

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This type touch screen should be controlled using a sense of pressure. The main part of the resistive touch screen is a resistive film screen that fits very well with the surface of the display, a multilayer composite film with a glass or hard plastic plate as the base. The surface is coated with a layer of transparent oxide metal (transparent conductive resistance) conductive layer, and a layer of external surface hardening, smooth anti-friction plastic layer, its inner surface is also coated with a coating, Between them there are many tiny (less than 1 / 1000 inch) transparent isolation points that insulate the two layers. When the finger touches the screen, the two layers of conductive layer contact at the touch point position, the resistance changes, and signals are generated in the X and Y directions, and then sent to the touch screen controller. The controller detects the contact, calculates the position of (XY), and then operates according to the simulated mouse. This is the resistance technology touch screen the most basic principle. So the resistance touch screen can be operated by a harder object. The key to the resistance touch screen is material technology. 


The commonly used transparent conductive coating materials are: ITO, indium oxide, the transmittance is 80%, however thin it is, the transmittance decreases. Up to 300A thickness, 80%.ITO is the main material used in all resistive touch screens and capacitive touch screens. In fact, the face of resistance and capacitance touch screens is the ITO coating. 


Nickel and gold coatings, the outer conductive layer of the five-wire resistance touch screen is made of nickel and gold coating materials with good ductility, and the outer conductive layer is made of nickel and gold materials with good ductility due to frequent touch. The purpose is to extend the service life but the process cost is high. Although the nickel and gold conductive layer has good ductility, it can only be used as a transparent conductor and is not suitable for the working face of resistance touch screen because of its high conductivity and the fact that the metal is not easy to achieve very uniform thickness, so it is not suitable for voltage distribution layer, but can only be used as a probe layer.