The touch screen interface of various devices can be built in several different ways. However, the purpose of the touch screen interface remains the same regardless of technical design. They are to recognize one or more contact points on the monitor, to recognize the corresponding command of a particular point of contact, and to deliver the command to the software application.
The two most commonly used techniques are capacitive and resistive systems which utilize a metallic sheet to conduct an electrical current. A change in the current is recognized as a touch on the screen and the corresponding command is executed.
There are two systems that utilize infrared light technology to capture touch screen user interactivity. The first touch screen system creates a grid of light that detects interruptions caused by an object coming in close contact with the screen. The other system records shadows created by objects and the shadows are detected by a pair of cameras to triangulate the position of the object.
However it is done, the purpose of different techniques in creating a touch screen interface is to determine the command depending on what controls are displayed at the time and the location the contact occurred.
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