USES OF TOUCHSCREENS Touchscreens are used in information kiosks, computer based training devices, and systems designed to help individuals who have difficulty manipulating a mouse or a keyboard. Touchscreen systems are also used in a variety of applications, including point of sales systems, public information displays, industrial control systems, etc. There are a number of touchscreen technologies: RESISTIVE: A resistive touchscreen panel is composed of several layers. SURFACE ACOUSTIC WAVE : Surface acoustic wave (SAW) technology uses ultrasonic waves that pass over the touch screen panel. CAPACITIVE: Such panels are coated with indium tin oxide that conducts a continuous current across the sensor. INFRARED: Method uses an array of vertical and horizontal IR sensors that detect the interruptions of a modulations light beam near the surface of the screen. STRAIN GAUGE : Here the screen is spring mounted on the 4 corners and strain gauges are used to determine deflection
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