Structure and Detection Mechanism of
Digital Matrix Resistive Touch Screen
The basic structure is same as the resistive single touch type. It is a two-layer structure, two materials (film or glass) with ITO are attached with a gap between them so that the ITO layers are facing each other.
Touch input will be made as the top layer is pressed down and the two ITO layers contact.
There are insulators called spacing dots between the top and bottom ITO layers. These spacing dots prevent unintended contacts (inputs) of the ITO layers when not pressed.
Transparent electrodes are formed on the top and bottom layers. These electrodes are facing in a matrix format.
As the top layer is pressed and contacts the bottom layer, the intersection point of the electrodes will conduct, thus detected as the touched point.