ITO Touch Screen is an interactive input device integrated into electronic display. The operator can simply give instructions by touching the touch screen. The touch screen consists of two conductive layers. The top layer is ITO film while the bottom layer can be either ITO film or ITO glass. The top layer is suspended by very small spacer dots. The smallest dot is 0.035mm .
When the operator touches the touch screen, the conductive inner surface of the ITO film makes contact with the conductive coating on the top surface of the ITO film or ITO glass. Then, the controller senses the touch and passes the information to the corresponded IC.

1. On the operation, specific voltage is loaded across the glass and film.
2. When touched by finger or pen on the screen, ITO coated film and glass is electrically short at the touch point.
3. Touch screen controller senses the voltage changes in the "X" and "Y" direction and sends the proper signal to the touch screen applied device, recognizing the touch location.
Resistive touch screens typically have high resolution (4096 x 4096 DPI or higher), providing accurate touch control. Because the touch screen responds to pressure on its surface, contact can be made with a finger or any other pointing device.
Resistive touch screen technology works well with almost any stylus-like object. In some circumstances, this is more desirable than a capacitive touchscreen, which has to be operated with a capacitive pointer, such as a bare finger. The costs are relatively low when compared with active touch screen technologies. Resistive touch screen technology can be made to support multi-touch input.