is a touch screen type display which is touch-sensitive transparent panel covering the screen’ Instead of using a pointing device like a mouse or a pen light, you can use your finger to draw objects on the screen’

The advantages of this technology are evident’ Instead of charging for over input devices like a mouse or keyboard, the user only needs a finger to operate the chosen device’ But not only mobile devices that receive this input’ All types of devices can be equipped, including television and computer monitors, LCD monitors, CRT monitors and old equipment’ Accordingly, a waiter can press on a screen to ring in a long night drinks, rather than a kind of price, a nurse can enter patient information with one hand’ Really, the possibilities are endless with touchscreens’

Touch screens are generally three types of recognition of a contact person’ These are resistive, capacitive and surface acoustic wave’ The works of resistive type with two panels with a space between them’ When the user clicks on the screen, two sets of contact this time, the exact coordinates are saved to the computer’

A capacitive system has a small electric charge through the touchscreen’ When the user touches the chosen field, part of the electric charge is distributed in the finger, which reduces the load on the site’ The coordinates are recorded and sent back to the computer’ This screen produces a clearer image because it transmits more light and does not require two panels’

Finally, the surface acoustic wave is the best and most clear in the picture’ The sensors are used to send electrical signals through the screen, and if the user touches the screen, which can determine the location based on how the signal is received from one transducer to another’

Since the system must have a finger capacitive absorbing electricity, most of the objects of life will not be registered as a contact’ Resistive systems, surface acoustic wave and also respond to almost any form of pressure’ Each has its benefits as a result, manufacturers and find new ways to use them’

Finally, although touch screens to provide a natural interface for novices, are not satisfactory for most applications with your finger, because it is a relatively large object’ It is impossible to point accurately to small areas of the screen’ In addition, most users find touch screens tiredness in the arms after long use’

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