Resistive Touch Panel
Resistive touch screen works mainly through the principle of pressure sensing to achieve the operation of the screen content and control, this touch screen screen part is a very consistent with the display surface of the multi-layer composite film, of which:
The first layer is glass or plexiglass bottom
The second layer for the compartment
The third layer for the multi-resin surface
The surface is also coated with a layer of transparent conductive layer, and then covered with a layer of the outer surface of the hardened, smooth scratch-resistant plastic layer. The conductive layer and the glass layer sensor on the surface of the multi-fat surface layer are separated by a plurality of minute separators through the surface layer, and when the touch surface layer is pressed down, the controller is simultaneously read from the four corners with a commensurate current and Calculate the distance of the finger position.
This touch screen uses two layers of highly transparent conductive layer to form the touch screen, the distance between the two layers is only 2.5 microns. When the finger touches the screen, the two layers of conductive layers, which are usually insulated from each other, have a contact at the touch point where one of the conductive layers turns on the 5V uniform voltage field in the Y-axis direction so that the voltage of the detection layer changes from zero to Non-zero, the controller detects the connection, the A / D conversion, and the resulting voltage and 5V compared to the touch point can be Y-axis coordinates, the same reason to get the X-axis coordinates, which That is, all resistance technology touch screen common basic principle.