Invisible display device and treatment method and application equipment thereof

The invention discloses an invisible display device and a treatment method and application equipment thereof. The method comprises the following steps of: adding a bottom layer on the surface which is previously used for displaying; engraving content or area to be displayed on the bottom layer; and adding a surface layer on the bottom layer, wherein the light coverage ratio of the surface layer is lower than that of the bottom layer. Through the device, the method and the equipment, the display content of a to-be-treated member is invisible in a state that the backlight is not lighted, so that an entire effect is formed, simplicity, low cost and rich color are guaranteed, the high brightness or matt effect can be achieved, and user experience is improved.