Different types of touch screens operate on different physical principles .The main types of touch screens, two - capacitive and resistive.There are other types, for example, the screen surface acoustic wave, infrared, optical, strain, induction (used in graphics tablets), and others. But a chance encounter with these types of screens in everyday life is small enough, so let's talk about the two most commonspecies touchscreens.
types of touchscreens: resistive
Resistive touch screen - it's more simple and cheap technology .Such a screen consists of two main parts: a conductive substrate and a plastic membrane.When you click on the membrane, it is closed to the substrate.Wherein the control electronics computes the resistance that occurs b
Resistive touch screens are used in PDAs, communicators, some mobile phones , POS-terminals, tablet PCs, industrial control devices, medical equipment.Typically, small-sized devices equipped with a resistive screen are set at stylus to make it easier to push the diaphragm (at a lower area of the screen with your finger to make it difficult).
significant advantages of resistive screens - this is their simplicity and low cost , which ultimately reduces the price of the entire device.They are also resistant to contamination.But the main thing - even in the absence of a special pen, you can work with them in almost any hard blunt object, which would be at hand.At the touch of your fingers, they also respond, even if gloved hand, however, touch must be strong enough.
But there is a resistive screen and disadvantages .This type of touch screen is sensitive to mechanical damage: if you use a stylus instead of the wrong thing, say, or to keep the phone in one pocket with keys, it can be easily scratched.Therefore, devices with this type of screen is best to purchase a special protective film.Sensitivity resistive screens at low temperatures decreases.In addition, the transparency of their too, leaves much to be desired: they miss a maximum of 85% of the light emitted by the display.
types of touch screens: capacitive
capacitive touch screen uses the fact that a large capacity objects (in this case - people) carried out an alternating electrical current .These screens are made of glass plate, which is covered with a transparent resistive alloy.On the conductive layer is transferred to a small AC voltage.If you touch the screen the finger or other object, conducting a current leakage occurs, it is fixed sensors, and calculates the coordinates of the point pressed.There
conventional capacitive screens and projection- capacitive .The second technology - the more "advanced".These screens are more sensitive (for example, responding to a gloved hand, depending on a capacitive), technology support multi (simultaneous determination of the coordinates of several points of contact).Capacitive screens are used in parts of ATMs, information kiosks, and protected areas.Projection-capacitor - electronic kiosks in the street, payment terminals, ATMs, touchpads laptops, smartphones and other devices with support for multitouch.
Advantages of touch screens - it's durability, resistance to most contaminants (those that do not conduct electricity), high transparency of the screen, the ability to work at low temperatures.If necessary, you can provide a high strength - glass layer on the capacitive screen can be up to 2 cm thick. Capacitive screens respond to the lightest touch.Projection-capacitive screens also support multi-touch.
disadvantage of capacitive screens - the higher cost compared to resistive .In addition, these screens react only conductive objects: a finger or a special pen (not the same as used with resistive screen).Some craftsmen manage to use dogs, but where is the guarantee that the sausage will be on hand at the right moment?
As you can see, different types of touch screens have their advantages and disadvantages , so you decide which one is more suitable for you personally.