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Resistive Touch-screen
Oct 12, 2018

This touchscreen is controlled using pressure sensing. The main part of the resistive touch screen is a resistive film screen with the display surface, which is a multilayer composite film, it is a layer of glass or hard plastic plate as the base, coated with a layer of transparent oxide metal (transparent conductive resistance) conductive layer, covered with a layer of surface hardening treatment, smooth anti-friction plastic layer, Its inner surface is also coated with a layer of coating, between them there are many small (less than 1/1000 inches) of the transparent isolation point between the two layers of conductive layer separated insulation. When the finger touches the screen, the two layers of conductive layer have contact at the touch point position, the resistance changes, the signal is generated in the X and y two directions, and then the touch screen controller is sent. The controller detects this contact and calculates the position (x, y), and then operates according to the simulated mouse mode. This is the basic principle of resistive technology touch screen. So the resistive touch screen can be operated with a harder object.

The key to resistive touch screen is material technology, commonly used transparent conductive coating materials are: ITO, indium oxide, weak conductive body, the characteristic is when the thickness drops to 1800 (10-10 meters) will suddenly become transparent, light transmittance of 80%, and then thin down the transmittance decreases, to 300 the thickness of the rise to 80%.

Ito is the main material used in all resistive technology touch screen and capacitive technology touch screens, in fact the face of the resistive and capacitive technology touchscreen is ITO coating.

Nickel-Gold coated, five-wire resistive touchscreen with the outer conductive layer using a ductile nickel-gold coating material, Because of the frequent touch of the outer conductive layer, the use of ductile nickel-gold materials is intended to prolong the service life, but the process costs are high. Although the nickel conductive layer is good ductility, but only transparent conductor, not suitable as a resistive touch screen face, because of its high conductivity, and the metal is not easy to achieve a very uniform thickness, not suitable for the voltage distribution layer, can only be used as the exploration layer.


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