You can think of the graphic overlay as part of the membrane switch, which is the top layer. Generally speaking, there are six layers of membrane switch: graphic overlay, upper adhesive, upper circuit, the spacer, lower circuit, and back adhesive. For graphic overlay, it is simple. There are two layers, graphic overlay and back adhesive. All in all, membrane switch is a component that controls the function of the entire machine, while graphic overlay is only for decoration. It will not exert an influence on the machine.