Flat luminescent screen, method for manufacturing thereof and method for displaying and image on a flat luminescent screen

摘要

The flat luminescent screen of the invention contains a substrate and a matrix of electrically conductive elements consisting of rows and columns arranged on the substrate. The emitter represents a plurality of microscopic tips made from an electrically conductive material and arranged in the regions of the intersections of rows and columns; they have a height "h" and a diameter "d". Each region of an intersection of rows and columns which forms a pixel contains at least one microscopic tip. A phosphor film, which contains dopants, is selected from the group consisting either of ZnS, with a dopant selected from the group containing Cu, Al, Ag, Mn, or SrGa2S4, with an Eu dopant, or else ZnGd2O4 with a Ce dopant, wherein ZnS, SrGa2S4 and ZnGd2O4 correspond to the three colors of phosphor dots. The anode, made of an electronically conductive optically transparent film, is arranged on the phosphor film containing a dopant. A semiconductor film arranged on the surface of the emitter, on the top of the tips, is used to heat electrons. The thickness of the film is less than half of the height of the tips. The phosphor film containing a dopant is arranged on the surface of the semiconductor film and has a thickness determined by the relaxation length of the maximum energy Wmax of hot electrons; the other side thereof is contacted with the anode. A dielectric material is arranged in the regions between the microscopic tips. The distance between rows and columns is comprised between the diameter "d" of a microscope tip and the height "h" of the said tip.