There are two major types of touch screen controls: resistive touch screen control and capacitive touch screen control.
A resistive touch screen control panel is coated with a metallic electrically resistive layer that can cause a change in the electrical current, which is registered when touched, and sent to the controller for processing.
A capacitive touch screen control panel is coated with a material that stores electrical charges. When touched, a charge is drawn to the point of contact and circuits located in the panel measure that charge and then send the information to the controller to process it.
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