Abstract: In a fluorescent display panel comprising a grid member comprising, in turn, a pair of grid leads extended integrally from a grid frame to which a grid is attached, each grid lead is fixed to a substrate of the panel. When driven in a time division fashion, the panel produces audible noises disagreeable to the ear. In order to reduce the noises, at least one of the grid lead pair is deformed perpendicularly of the grid at its portion between the grid frame and the portion at which the grid lead is fixed to the substrate. The deformation may be an indent directed either away or towards the substrate, with the thickness of the grid lead rendered at the position of the indent. The deformation may alternatively be a bend, with the thickness kept uniform. Also in the latter case, an indent is formed in the grid lead.

Abstract: It is a recent trend in a fluorescent display device comprising a plurality of anode units, each composed of segmented anodes arranged in a preselected configuration, that grids aligned in one-to-one correspondence to the anode units are rendered narrower in the direction of alignment. The device comprises a first and a second group of anode connections for every other one of the anode units and the remaining anode units, respectively, with each of all anode connections connected to a prescribed one of the segmented anodes of each anode unit. For making the device display at least one digit, a grid driver energizes all grids, preferably cyclically, a particular one at a time slot together with at least one nearest grid. An anode driver selectively energizes the anode connections of one of the two groups that includes the anode unit to which the particular grid is in one-to-one correspondence.

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.

Abstract: A luminescent display panel comprises a substrate assembly comprising a solid insulator substrate and an underlying and an overlying insulator layer successively thereon, a glass cover, and a sealing layer sealing the glass cover and the substrate assembly to enclose a vacuum space where electrodes of the panel are placed. Use is made of a sealing mass for positively eliminating slow leak which otherwise occurs if at least one of the leads for the electrodes interposed between the insulator layers is extended outwardly of the vacuum space continuously along the overlying layer. The sealing mass may comprise that portion of the underlying layer which lies across the sealing layer, with all leads laid directly on the solid substrate at their portions extended across the sealing layer.

Abstract: A substrate assembly for a fluorescent or phosphorescent display panel comprises segmented electrodes, for deposition thereon of masses of a fluorescent or phosphorescent material, respectively, on electroconductive leads disposed on a substrate of an electrically insulating material, such as glass or ceramics. Each segmented electrode comprises graphite powder bound into a mass by a zinc oxide containing vitreous material that does not substantially include lead. The segmented electrode may consist of an intermediate layer placed on each electroconductive lead and a segmented layer disposed on the intermediate layer.

Abstract: A multi-digit luminescent display tube comprises a plurality of luminescent anode segment groups. All anode segment groups may be regularly spaced. Alternatively, at least one single anode segment group may be spaced wider from the remaining regularly spaced ones. A grid is interposed between a cathode and each anode segment group and comprises a pair of grid frame members, or rectangular metal rods, transversely of the cathode. Two of the frame members are made wider on both ends of a series of regularly spaced grids than other frame members of the grid series. Both frame members are also made wider for the single anode segment group than the above-mentioned other frame members.

Abstract: A flat display panel comprises a planar substrate as a part of a hermetically sealed envelope. Electrode end pieces connected at least to predetermined ones of the electrodes for display are fixed to the substrate. A plurality of grooves are formed in the substrate and snugly receive a predetermined portion of terminals connected to the respective end pieces and extended outwardly of the envelope for connection to an external circuit for driving the display panel. Preferably, the grooves have sloping end surfaces along which the respective terminals are partly extended.

Abstract: A method for producing multi-figure luminescent display tubes comprising a step of baking a frit glass for fixing parts such as grid electrodes and filament supports onto a substrate which is provided with segment electrodes having phosphor layers applied thereon. The baking process is carried out in a non-oxidizing environment and an infrared heater is used prior to baking to eliminate the frit binder.

Abstract: A glass cover plate of the type having a shape of a rectangle in outline and comprising an outwardly protruded central portion for covering electrodes of a flat display panel and a peripheral flange having a planar surface for seal to a planar substrate of the display panel. A projection is formed along margins of the flange at least at each corner portion of the rectangle. The projection may extend away from the planar surface substantially in the sense in which the central portion protrudes or extend from the planar surface substantially against the sense in which the central portion protrudes.

Abstract: A multi-digit luminescence display tube comprises an anode assembly including a plurality of luminescent anode segments for each digit, a cathode, a plurality of grids disposed between the cathode and the anode segments of the respective digits, structure for supplying first voltages to the grids and to at least a selected one of the anode segments to make the same luminesce, and apparatus for superposing a second voltage on the first voltage supplied to at least a selected one of the grids to suppress luminescence at the anode segments covered thereby. The cathode comprises a common filament for the anode segments of all digits. Structure is provided for rendering the second voltage non-negative without adversely affecting the brightness of the selected anode segment which are not covered by the selected grid.