Fluorescent display device

Claim 1

A fluorescent display device comprising: a transparent insulating substrate defining a pair of opposed surfaces; transparent anode sections made of transparent conductive films applied on one surface of said transparent substrate and having phosphor layers desposited thereon; wiring means formed on said one surface of said transparent substrate for applying display signals to said anode sections; cathodes mounted above said anode sections for emitting electrons impinging upon said anode sections to allow said phosphor layers to produce light emission of a predetermined shape in response to said display signal; insulating layers deposited on said transparent conductive films except said anode sections on which said phosphor layers are deposited; control electrode means disposed between said cathodes and said anode sections for controlling and accelerating said electrons to allow said electrons to uniformly impinge upon the entire surfaces of said phosphor layers; a cover mounted on said substrate and in sealing relationship therewith, wherein the space between said substrate and said cover is evacuated to provide a sealed, evacuated envelope; said phosphor layers having a thickness less than said insulating layers; and said control electrode means having anti-static conductive portions extending to at least the surface portions of said insulating layers adjacent to and around each of said phosphor layers in the close or adjacent relationship to said surface portions, whereby said luminous display produced by said phosphor layers is observed through the other surface of said transparent substrate.