Abstract: A fluorescent display device is disclosed having a grid which is divided into several pieces electrically separated and disposed in close proximity and in an opposed relationship at the edges thereof. The grids are held in position within the display device by an elongated insulator which bridges the respective opposed edges of the grids and a sealing portion around the periphery of the display device.

Abstract: A fluorescent display device having at least a filamentary cathode for emitting electrons, pattern display sections each coated with fluorescent material, a plurality of control electrodes electrically independent of one another provided opposite to the pattern display sections respectively, the anodes and control electrodes being selectively given drive signals thereby to make the electrons emitted from the filamentary cathode impinge on the anodes so as to display characters, numerals, graphic forms and the like on the pattern display sections, and a plurality of auxiliary electrodes provided at or above and in the vicinity of gaps between the control electrodes respectively and at all times kept at a positive potential with respect to the filamentary cathode so that the mutual influence of the control electrodes may be intercepted.

Abstract: A fluorescent display device having pattern display sections each composed of phosphor-coated anodes arranged in the form of a matrix, at least a filament for emitting electrons when heated, the anodes being selectively bombarded with electrons emitted from the cathode to produce a visual display, position-selecting grids provided between the filament and the pattern display sections, column-selecting grids or row-selecting grids provided opposite to the columns or rows of the anodes, and a frame member provided, on its surface facing the filament, with the position-selecting grids and on its surface facing the pattern display section with the column-selecting grids or the row-selecting grids, the frame member being made of insulating material at least where necessary. With the provision of the frame member, the device of the present invention can be assembled easily, securely and correctly, and can produce a high-quality display.