As an important part of the mechanical terminal equipment, the glass cover not only protects the display, but also serves as a window for the operator to talk to the operator and the customer. Operators and customers see the display more clearly through the glass cover, and have a paper-like feel. The sound of “shashasha” is like writing on paper. As a commercial device, the machine also has high requirements on the stain resistance and fingerprint resistance of the screen surface.