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baroliv245 March 5th, 2013 01:14 PM

Mystery Of Touch Screens
 
The resistive touch screen is composed of two electrically coated sheets of certain material separated by a small gap.

The two resistive circuit layers are coated on one side by transparent metal oxide coating (Indium tin oxide ITO) and these two layers are separated by insulating dots to avoid electrical contact in idle state. When touch pressure is applied to the top resistive layer, it flexes back towards the second layer and an electrical contact is produced at the corresponding point and the circuit is completed. A voltage is produced in both layers, one layer voltage is used to detect the horizontal location of touch and other layer voltage for vertical location of touch. On the backside of all this scheme is an electronic control circuit which detects the location of touch point and passes the data to the touchscreen controller on which the touchscreen software acts and produces the output which is the effect of our touch on screen. Resistive touch screen require pressure to complete a touch effect and one can anything such as finger, pencil, pen etc. to register a touch on resistive touch screen


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