Resistive touch screens use pressure sensor for control. Resistive touch screen is a main part of the surface is very match the resistance of the film and display screen, it is a kind of multilayer composite films, it with a piece of glass or hard plastic flat as grassroots, surface coated with a layer of transparent conductive metal oxide layer, the above with a layer of surface hardening treatment, smooth and rubbing the plastic layer, its inner surface is coated with a layer of coating, among them there are many tiny transparent isolation point separates two conductive layer of insulation. When fingers touching the screen, two conductive layers in touch point location had contact, resistance to change, produced in the X and Y directions signal, and then send a touch screen controller. Controller to detect the contact and calculate the position, according to simulation the mouse operate. This is the most basic principle of resistance technology of touch screen. Resistance touch screen is the key to material science and technology, the commonly used transparent conductive coating materials are:
A, ITO, indium oxide, weak electrical conductor, the feature is that when the thickness has dropped below 1800 el will suddenly become transparent, light transmittance was 80%, the light transmittance drop instead, if you go on thin to 300 when Mr Thickness and up to 80%. ITO is all resistance touch screen technology and capacitive touch screen using the main material, in fact the resistance and capacitance touch screen working face is ITO coating technology.
B, nickel and gold coatings, five line of resistance touch screen outer conductive layer using a good ductility nickel gold coating material, conductive layer due to frequent touch, good ductility of nickel alloy material in order to extend the service life, but the process cost is relatively high. Nickel gold conductive layer while the ductility is good, but can only be transparent conductor and doesn't fit as working face of resistive touch screens, because of its high conductivity, and the thickness of metal is not easy to do it is very uniform, unfavorable for voltage distribution layer, only as a agent layer.
Four-wire resistive screen
Four-wire resistive analog technology of two layers of transparent metal layers each layer increased while working 5 v constant voltage: a vertical and a horizontal direction. A total of four cables. Features: high resolution, high speed transfer reaction. Surface hardness processing, reduce the scratch, scratch and chemical treatment. With smooth surface treatment and fog. A correction, high stability, never drift.
Five line resistance screen
Five line resistance touch screen technology base the voltage field of two direction by precision resistor network is added in conductive glass, we can simply understood as voltage field in two directions and at the same time work, and the outer conductor used as more than just pure nickel gold conductive layer, a touch points after testing the inner ITO contact point X axis and Y axis voltage method measured the position of the touch point.
Five inner ITO need four lead wire resistance touch screen, outer only just a conductor, touch screen have to lead a total of 5. Features: high resolution, high speed transfer reaction. High surface hardness, reduce the scratch, scratch and chemical treatment. With the point contact 30 million can be used. Conductive glass substrate of the medium. A correction, high stability, never drift. Five line resistance touch screen with high prices and demanding drawback on the environment.
The limits of resistive screen
Whether 4-wire resistive touch screen or five line resistance touch screen, they are a completely isolated to the outside environment, does not fear the dust and water vapor, it can use any object to touch, can be used to write drawing, more suitable for industrial control field and the use of the limited people in the office. Resistive touchscreen common faults because the outer layer of the composite membrane with plastic materials, people who do not know too hard or the use of sharps touch may scratch the touch screen to scrap. Scratches within limits, however, will only hurt the conductive layer and the conductive layer of scratch for five line resistance touch screen has nothing to do, and for 4-wire resistive touch screen is fatal.
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