Direct-view storage tubes store picture information directly behind the screen using an electron beam to write a charged pattern on a fine mesh grid coated with dielectric. A flood electron gun then emits a continuous flood of electrons that pass through the grid, attaching to positively charged portions and striking the phosphors. This stored charge pattern is what displays the image without needing refreshment like a standard CRT. Advantages are very high resolution images without flicker, while disadvantages are inability to display color and inability to fully erase selected areas.