For operational convenience, people touch screen instead of the mouse or keyboard. Work, we must first touch with your fingers or other objects mounted on the front of the touch screen display, then the system under the fingers touch the icon or menu choice to locate the position information input. Touch screen touch detected by the touch screen controller components and composition; touch detection component installed in the front of the monitor screen for detecting user touch position, touch screen controller to accept evacuation; and touch screen controller’s main role is to touch detection device from receiving touch information and convert it into contact coordinates, and then sent to CPU, CPU is also capable of receiving the order and sent to the Executive.

The main types of touch screen touch screen in accordance with the principle and information transmission medium, we have touch screen is divided into four types, which were resistive, capacitive sensors, infrared and surface acoustic wave type. Each type of touch screen has its own strengths and weaknesses, to understand the kind of touch screen apply to the kind of occasion, the key is to know how each type of touch screen technology, working principles and characteristics. The following types of touch on the screen for a brief overview:

1, resistive touch screen touch screen that is controlled by pressure sensors. The main part of the resistive touch screen is a great match with the display surface of the resistance film screen, which is a multi-layered composite film, which a layer of glass or hard plastic plate as a grass-roots, the surface is coated with a layer of transparent metal oxide (transparent conductive resistance) conductive layer, above and then covered with a layer of hardening the outer surface, smooth anti-friction plastic layer, and its inner surface is also coated with a layer of coating, in between them there are many small (less than 1 / 1000 inch) transparent conductive layer separation point to two separate insulated. When the finger touch screen, two conductive layers in the touch point location will have a contact resistance changes, in both directions X and Y to generate the signal, then send the touch screen controller. Controller to detect and calculate the exposure (X, Y) position, then operate the simulation of the mouse. Resistive touch screen technology that is the most basic principles. Resistive type touch screen key material, transparent conductive coating materials commonly used are:

A, ITO, indium oxide, weak electrical conductors is characterized by the thickness down to 1800 when Egypt (Egypt = 10-10 m) below will suddenly become transparent, light transmission rate of 80%, then thin down instead of transmittance down to 300 Egyptian thickness Shiyou up to 80%. ITO resistive touch screen technology for all and capacitive touch screen technology are the main materials used, in fact, resistance and capacitance touch screen face is ITO coating.

B, nickel-gold coating, five-wire resistive touch screen of the outer conductive layer scalability is a good use of nickel-gold coating materials, outer conductive layer due to the frequent touch, use good ductility nickel deposit materials in order to extend the service life , but the technology costs more expensive. Ni-Au conductive layer scalability is good, but only for transparent conductors, is not suitable for resistive touch screen face, as it high conductivity, and metal is very difficult to achieve uniform thickness, suitable for voltage distribution level, only as a probe layer.

1.1 The four-wire resistive screen 4-wire resistive analog technology, the work of two transparent metal layers were increased when the 5V constant voltage of each layer: a vertical direction, a horizontal direction. Total need 4 cables. Features: High-resolution, high-speed response. Surface hardness, decreases the abrasion, scratch and anti-chemical treatment. Deal with smooth and matte. A correction, high stability, and never drift.

1.2 5 wire resistive screen 5-wire resistive touch screen technology to the grassroots level in both directions of the voltage field through precision resistor networks are added to the work of conductive glass surface, we can simply be understood as time-sharing in both directions of the voltage field work added the same work surface, while the outer layer of nickel deposit conductive layer is only just used as a pure conductor, a touch test after the time-ITO contacts the inner X-axis and Y-axis voltage method measured touch point. 5 wire resistive touch screen ITO need four inner lead, the outer conductor only for just a touch screen may Lead Total 5. Features: high-resolution, high-speed transfer reaction. High surface hardness, reduce abrasion, scratch and anti-chemical treatment. 30 million times with the point contact can still use. Conductive glass substrate medium. A correction, high stability, and never drift. 5 wire resistive touch screen with high prices and environmental demands of high disadvantage 1.3 resistance screen limitations, whether four-wire resistive touch screen, or 5 wire resistive touch screen, they are a kind of isolates the working environment, not afraid of dust and water vapor , which can be used to touch any object that can be used to draw and write, more suitable for industrial control and office of limited use. Resistive touch screen is a common drawback is that the outer film composite plastic materials, do not know too hard or sharp object to scratch the whole touch screen touch may be a result of obsolescence. However, within limits, will only scratch injured outside the conductive layer, conductive layer of the scratch for the five-wire resistive touch screen is not related, and four-wire resistive touch screen is fatal.

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