Capacitive Touch Screen Panel
Capacitive touch screen panels usually consist of a multi-layer structure, the most important of which is a transparent conductive layer, usually an indium tin oxide (ITO) coating. This conductive layer is covered with one or more layers of glass or other transparent material to protect it from physical damage. An electrode pattern is etched or printed on the conductive layer for detecting touch events. When a user's finger or other conductive object contacts the touch screen panel, an electric field is formed between the finger and the conductive layer. This change in electric field is detected by the electrodes and converted into an electrical signal. By measuring these electrical signals, the system can determine the location, size, and shape of the touch event.