smart board wholesale.The working principle of the resistive touch screen is mainly to realize the operation and control of the screen content through pressure sensing. The working mechanism is: when the touch table is laminated, the bottom layer is touched, and the controller simultaneously reads the symmetrical current from the four corners. The physical position of the touch point (X, Y) in the rectangular area is converted into a voltage representing the X coordinate and the Y coordinate, and the distance of the finger position is calculated. The touch screen body portion is a multi-layer composite film which is very compatible with the surface of the display, wherein the first layer is a glass or plexiglass bottom layer, the second layer is a spacer layer, the third layer is a multi-resin surface layer, and the surface is also coated with a layer. A transparent conductive layer covered with a hardened, smooth and scratch-resistant plastic layer.