TYPES OF TOUCH SCREEN TECHNOLOGIES:

There are three types of touch screen technology:
* Resistive: A resistive touch screen panel is coated with a thin metallic
electrically conductive and resistive layer that causes a change in the electrical
current which is registered as a touch event and sent to the controller for
processing. Resistive touch screen panels are generally more affordable but offer
only 75% clarity and the layer can be damaged by sharp objects. Resistive touch
screen panels are not affected by outside elements such as dust or water.
* Surface wave: Surface wave technology uses ultrasonic waves that pass over
the touch screen panel. When the panel is touched, a portion of the wave is
absorbed. This change in the ultrasonic waves registers the position of the touch
event and sends this information to the controller for processing. Surface wave
touch screen panels are the most advanced of the three types, but they can be
damaged by outside elements.
* Capacitive: A capacitive touch screen panel is coated with a material that
stores electrical charges. When the panel is touched, a small amount of charge is
drawn to the point of contact. Circuits located at each corner of the panel
measure the charge and send the information to the controller for processing.
Capacitive touch screen panels must be touched with a finger unlike resistive
and surface wave panels that can use fingers and stylus. Capacitive touch
screens are not affected by outside elements and have high clarity.