What is a Touch Screen...
A touch screen is any monitor, based either on LCD (Liquid Crystal Display) or CRT (Cathode Ray Tube) technology, which accepts direct onscreen input. The ability for direct onscreen input is facilitated by an external (light pen) or an internal device (touch overlay and controller) that relays the X, Y coordinates to the computer.
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Polyester Film
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Upper Resistive Circuit Layer
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Conductive ITO (Transparent Metal Coating)
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Lower Resistive Circuit Layer
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Insulating Dots
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Glass/Acrylic Substrate
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Touching the overlay surface causes the (2) Upper Resistive Circuit Layer to contact the (4) Lower Resistive Circuit Layer, producing a circuit switch from the activated area.
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The touch screen controller gets the alternating voltages between the (7) two circuit layers and converts them into the digital X and Y coordinates of the activated area
