Luminescent display panel having a transparent and conductive film

Abstract

A luminescent display panel comprises a planar anode assembly comprising luminescent anode segments. A glass cover has peripheral flange portions surrounding a window area. So as to enclose a vacuum space, the flange portions are hermetically sealed to the anode assembly by a frit glass layer together with lead-out conductors arranged along at least one particular flange portion for the anode segments, at least one grid, and at least one hot cathode. A transparent and electroconductive film is formed mainly on an inside surface of the window area. The film may be formed also on the flange portions. If formed, the film portion formed on the particular flange portion should have a higher electric resistance than the electroconductive film portion. For example, the resistances should be 10 M.OMEGA. or more between two adjacent lead-out conductors for the anode segments, 1 M.OMEGA. or more between two adjacent conductors for the grids, an anode segment conductor and an adjacent grid conductor, and an anode segment conductor and an adjacent cathode conductor, and 100 k.OMEGA. or more between a grid conductor and an adjacent cathode conductor. On forming the electroconductive film, the particular flange portion may be either covered by a metal cover or preliminarily coated with a powder material which can be removed after formation of the film.