When Arlon light box cloth is used as a door light box, the distance between the light source and the light box cloth should be moderate, otherwise there will be ribs or the brightness will not reach. Pay attention to the neatness and smoothness of the picture, fix points on the four corners respectively, and then see if there is any need to adjust. If there is nothing to be adjusted in the picture, you can' reinforce' it directly. Be sure to pull the cloth slowly, not several times. Finally, waterproof should be done to prevent the picture from being damaged by rain.