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US 4,540,983 AGranted
Fluorescent display device
AssigneeFutaba Denshi Kogyo K.K.
InventorsKiyoshi Morimoto, Hiroshi Watanabe
Life of this patent
Estimating the term…
Abstract
A fluorescent display device of the dot-matrix type is disclosed having control electrodes each formed by a plurality of wire-like conductors of a micro diameter to perform luminous display of a high density and decrease control voltage and current. A multi-color fluorescent display device of such type is also disclosed having one picture cell formed by a block consisting of a plural-fluorescent-layer unit having different luminous colors and performing display of a high luminance.
Claims11
A fluorescent display device comprising:
- a fluorescent display tube including a substrate formed of an insulating material, an anode conductor provided on said substrate and having a fluorescent layer deposited thereon, a first control electrode formed by a plurality of control electrode wires arranged in parallel with one another above said anode conductor to cover the entire surface of said fluorescent layer, a second control electrode formed by a plurality of control electrode wires arranged in parallel with one another above said first control electrode to extend in the direction perpendicular to said first control electrode wires, a filamentary cathode stretched above said first and second control electrodes, and a casing hermetically sealed on said substrate to form a highly evacuated envelope;
- and
- a driving circuit applying control voltages corresponding to a display to be obtained to said wires of said first and second control electrodes to select at least one area on said anode conductor and define said area as one picture cell and applying an anode voltage to said picture cell to allow said picture cell to emit light;
- wherein said driving circuit includes a first driving circuit section arranged in the X or Y-axis direction of said fluorescent display tube to control said first control electrode and a second driving circuit section arranged in Y or X-axis direction to control said second control electrode, and said driving circuit simultaneously operates said first and second driving circuit sections to apply control voltages to said controlled first and second control electrode wires;
- and
- wherein one of said driving circuit sections simultaneously applies a control voltage to each adjacent two wires of the corresponding control electrode and the other driving circuit section applies a control voltage to each wire of the corresponding control electrode, to thereby define an area on said anode conductor controlled by said first and second control electrode wires as one picture cell.
3 more elements
A fluorescent display device comprising:
- a fluorescent display tube including a substrate formed of an insulating material, an anode conductor provided on said substrate and having a fluorescent layer deposited thereon, a first control electrode fromed by a plurality of control electrode wires arranged in parallel with one another above said anode conductor to cover the entire surface of said fluorescent layer, a second control electrode formed by a plurality of control electrode wires arranged in parallel with one another above said first control electrode to extend in the direction perpendicular to said first control electrode wires, a filamentary cathode stretched above said first and second control electrodes, and a casing hermetically sealed on said substrate to form a highly evacuated envelope;
- and
- a driving circuit applying control voltages corresponding to a display to be obtained to said wires of said first and second control electrodes to select at least one area on said anode conductor and define said area as one picture cell and applying an anode voltage to said picture cell to allow said picture cell to emit light;
- wherein said driving circuit includes a first driving circuit section arranged in the X or Y-axis direction of said fluorescent display tube to control said first control electrode and a second driving circuit section arranged in Y or X-axis direction to control said second control electrode, and said driving circuit simultaneously operates said first and second driving circuit sections to apply control voltages to said controlled first and second control electrode wires;
- and
- wherein said first and second driving sections simultaneously apply control voltages to the respective adjacent two control electrode wires of the corresponding control electrodes to define an area on said anode conductor controlled by said wires as one picture cell.
3 more elements
Dependencies are inferred from the claim text.