Abstract: A fluorescent display device of the front emission type capable of permitting light-permeable anode conductors to be uniformly formed without any deformation and preventing color filters from being affected by etching carried out for forming the anode conductors. A light-permeable anode substrate is provided thereon with strip-like filters, which are then formed thereon with a uniform and flat protective film of light-permeable, insulating and etching-resistant properties. Then, anode conductors are arranged on the protective film. Thus, the anode conductors can be uniformly formed on the flat protective film irrespective of unevenness on a surface of the filters. Also, the protective film prevents the anode conductors from being exposed to etching liquid used for formation of the anode conductors.

Abstract: A fluorescent display device including a laterally elongated matrix-like display section and a plurality of control electrodes arranged in juxtaposition to each other while a longitudinal direction thereof is defined in a short side direction of the display section is disclosed which is capable of increasing a duty ratio when scanning the control electrodes. A plurality of picture cells are arranged longitudinally and laterally at equal intervals, resulting in forming the matrix-like display section. A plurality of sets of picture cells in an oblique direction are connected together. The control electrodes are connected together at every predetermined interval. Thus, when the control electrodes are scanned and the anode conductors are fed with a display signal, the fluorescent display device carries out graphic display while selecting desired picture cells at a high duty ratio.

Abstract: A display device capable of decreasing the number of drivers required for driving electrodes, decreasing the number of filamentary cathodes to reduce power consumption and utilizing electrons with high efficiency. In the display device, filamentary cathodes are arranged in parallel with control electrodes and in a manner to interpose two or more control electrodes between each adjacent two filamentary cathodes. Also, each deflecting control electrode is constituted by adjacent two control electrodes positioned right below each of the filamentary cathodes and scanned while being applied thereto a potential by way of a deflecting circuit. Further, to the control electrodes other than the deflecting control electrodes is constantly applied a potential negative with respect to the filamentary cathodes.

Abstract: A display device capable of preventing vibration of control electrodes stretched in an envelope. The control electrodes are divided into two assemblies or a main control electrode assembly and an auxiliary control electrode assembly arranged in contact with or in proximity to the main control electrode assembly so that vibrations of both control electrode assemblies may damp each other due to a difference between natural frequency therebetween, thereby restraining vibration of the control electrodes.

Abstract: A linear electrode construction for a fluorescent display device which is capable of providing the high densification of luminous display is disclosed. The linear electrode construction includes two electrode frames each comprising a plurality of linear electrodes arranged side by side at intervals of a predetermined distance and each having a fine wire-like electrode portion and a connecting terminal portion formed at one end of the electrode portion. The fine wire-like electrode portions are uniformly applied thereto tension to prevent the sagging in the operation. Also, a process for preparing such a linear electrode construction is disclosed.

Abstract: A linear electrode construction for a fluorescent display device which is capable of providing the high densification of luminous display is disclosed. The linear electrode construction includes two electrode frames each comprising a plurality of linear electrodes arranged side by side at intervals of a predetermined distance and each having a fine wire-like electrode portion and a connecting terminal portion formed at one end of the electrode portion. The fine wire-like electrode portions have tension uniformly applied thereto to prevent the sagging during operation. Also, a process for preparing such a linear electrode construction is disclosed.

Abstract: A graphic fluorescent display device is disclosed which is capable of effectively eliminating a streak pattern occurring right below cathodes. The fluorescent display device is constructed in such a manner that an electric field controlling electrode is disposed on the surface of a cover plate opposite to a substrate having anodes formed thereon, and potential positive with respect to the cathodes is applied to the electric field controlling electrode so that electrons emitted from the cathodes may be diffused by the positive electric field of the electric field controlling electrode.