Touch display module for industrial touch displays

The screen body of a resistive touch screen is a multi-layer composite film that matches the surface of the display. It is made up of a layer of glass or organic glass as the base layer, coated with a transparent conductive layer on the surface, and covered with an outer surface hardened, smooth and scratch resistant plastic layer. Its inner surface is also coated with a transparent conductive layer, and there are many small, less than one thousandth of an inch, transparent isolation points between the two conductive layers to isolate them.
When a finger touches the screen, the two normally insulated conductive layers make contact at the touch point. One of the conductive layers is connected to a 5V uniform voltage field in the Y-axis direction, causing the voltage of the detection layer to change from zero to non-zero. After this connection state is detected by the controller, A/D conversion is performed, and the obtained voltage value is compared with 5V to obtain the Y-axis coordinate of the touch point. Similarly, the X-axis coordinate can be obtained. This is the most basic principle common to all resistive touch screens.
The key to resistive touch screens lies in material technology. Resistive touch screens are divided into four wire, five wire, six wire, and other multi wire resistive touch screens based on the number of lead wires. Resistive touch screens are coated with two layers of OTI transparent oxide metal conductive layers on the reinforced glass surface. The outermost layer of OTI coating serves as a conductor, and the second layer of OTI is attached with a precise network of+5V to 0V voltage fields in both horizontal and vertical directions. The two layers of OTI are separated by small transparent isolation points.