KR930001419Y1 - Fluorescent display tube of dot matrix type - Google Patents

Abstract

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Description

Dot Matrix Fluorescent Display Tube

1 is a structural diagram showing a planar structure of a conventional dot matrix fluorescent display tube.

2 is a structural diagram showing a planar structure of a dot matrix fluorescent display tube according to the present invention.

* Explanation of symbols for main parts of the drawings

1, 10: filament 2-3, 21-25: wiring layer

a-j, 2a-j: anode 5-8.31-34: grid

The present invention relates to a dot matrix type fluorescent tube, and more particularly, to a dot matrix fluorescent display tube having an improved anode wiring and grease installation structure.

In general, the dot matrix fluorescent display tube used as a display device such as a digital measuring instrument, a communication device, etc., as shown in FIG. 1, the hot electrons emitted from the filament furnace 1, the grid (5) (6) (7) (8) (9) accelerated by the impingement on the phosphor applied to the anode (a) (b) (c) (d) (e) (f) (h) (i) (j) The display light is thereby exhibited.

In such a dot matrix fluorescent display tube, the wiring layer 2 wires an odd number of anodes, and the wiring layer 3 wires a plurality of even columns (two in the figure) of anodes to form two dots by one grid. . In this case, in order to emit light from the phosphor coated on the anode a, a rated voltage is applied to the grid 5 and the wiring layer 2 to be driven. In addition, in order to make the phosphor of the anode b emit light, a rated voltage is applied to the grid 5 and the wiring layer 3 and driven. At this time, a zero potential is formed between the grid 5 to which the rated voltage is applied and the cut-off voltage of the adjacent grid 6, and due to the zero potential, electrons emitted from the filament 1 are discharged from the anode b. Since the light is shifted to the left side, a non-light emitting portion is formed at the right edge of the anode (b) adjacent to the other grid, so that the light emitting state of the phosphor is not good.

It is an object of the present invention to provide a dot matrix type fluorescent display tube which can completely emit light for each dot by improving the problem of non-light emitting parts caused by interference between adjacent grids.

In order to achieve the above object, the present invention has a filament group for emitting hot electrons, a plurality of grids of a rectangular shape for accelerating hot electrons emitted from the plurality of filaments, and a phosphor to which the hot electrons accelerated in the grid is reached In the dot matrix fluorescent display tube having an anode, the anodes are divided into a plurality of groups so that the anodes of each group are located at the bottom of one grid, and a separate anode is provided between each group of the anodes. The two edges of the anode partially overlap the opposite edges of both grids of the group of anodes on both sides, and the anodes located between the grids are connected to separate wiring to which a separate drive voltage is applied. Has its features.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the dot matrix fluorescent display tube by the present invention.

The dot matrix fluorescent display tube according to the present invention has a planar configuration as shown in FIG.

According to FIG. 2, the filament group 10 and the anode group 2a to 2j are formed on a substrate such as glass or ceramic, not shown in the drawing, and the anode group is divided into five to the wiring layers 21 to 25. Connect and apply rated voltage sequentially.

In addition, the grid group 31 to 34 is installed in the form of three to four anodes in a rectangular shape, one anode (2b) (2e) (2g) (2j) is located between each of the adjacent grids. This edge slightly overlaps both edges of the adjacent grid, with the middle part positioned in the open portion between the adjacent grids.

The driving method of the dot matrix fluorescent display tube having the structure as described above is as follows.

The method of driving the fluorescent display tube of the present invention has two aspects. One is when driving the anodes 2a, 2c, 2d, 2f, 2h, 2i completely enclosed in the grid, and the other is the anodes 2b, 2e, which are provided between adjacent grids. 2j).

First, when driving the anode completely enclosed in the grid, a rated voltage is applied to the filament 10 and the wiring layers 23 and 24 in a conventional manner, for example, to emit the phosphor coated on the anode 2c or 2d. And the electric shock voltage is applied to only one grid 32. At this time, a predetermined cutoff voltage is applied to the other grid.

As a result, hot electrons reach the corresponding anode and emit light. At this time, the hot electrons do not reach the non-driven anode across the edge of the grid by the cutoff voltage of the adjacent grid.

In driving the anode located between the grids, for example, when the light emitting body coated on the anode 2b is to emit light, a voltage of the rated voltage ± 6 V of the filament 10 is applied, and the wiring layer 22 ), The rated voltage of the anode 2b is applied to 50V. In addition, when a rated voltage of 50 V is also applied to both grids 31 and 32 disposed on both sides of the anode 2b, hot electrons emitted from the filament 10 are accelerated by the grids 31 and 32. This impinges on the phosphor coated on the anode 2b. In this way, when the phosphor coated on the anode 2b emits light, the anode 2b is positioned below the grids 31 and 32 to which the driving voltage of the equipotential is applied, so that the overall location is deeply below the bottom of one grid. This allows hot electrons to be accelerated by these two grids, which are superimposed only in sufficient area, without being affected by the cut-off voltage (-3V) of neighboring grids located far away from them. At this time, if a driving voltage is applied to the anode under the two grids completely overlapped with the grid, the anode can be driven together, which is optional.

As described above, the fluorescent display tube of the present invention is divided into an anode completely overlapped with each grid and partially overlapped with both adjacent grids, and the distortion of the progress path of hot electrons proceeding to the anode by another adjacent grid. This is used in reverse to prevent partial unluminescence at the anode adjacent to the edge of the grid. That is, as described above, the dot matrix fluorescent display tube according to the present invention divides the anode group by 5 to sequentially apply a driving voltage, and arranges two grids on one anode for every three to four anodes to be adjacent to each other. Since there is no unluminous portion in the phosphor due to the cut-off voltage of the grid, there is an effect of maintaining a good emission state of the phosphor and reducing the number of wirings.

Claims (1)

In a dot matrix fluorescent display tube having a plurality of filaments emitting hot electrons, a plurality of grids having a rectangular shape for accelerating hot electrons emitted from the plurality of filaments, and a plurality of anodes coated with phosphors to which the accelerated hot electrons reach the grids. The anodes are divided into a plurality of groups such that the anodes of each group are located at the bottom of one grid, and a separate anode is provided between each group of the anodes, with both edges of the anode being the anodes on both sides thereof. A dot matrix fluorescent display tube, wherein the dot matrix type is partially overlapped with opposing edges of both grids of the group of A, and the anodes positioned between the grids are connected to separate wirings to which a separate driving voltage is applied.