KR100612226B1 - Vacuum fluorescent display device - Google Patents

Abstract

The present invention relates to a fluorescent display tube that can prevent partial unevenness occurring in a display pattern of a portion adjacent to an end side of a mesh grid. The fluorescent display tube of the present invention has a vacuum space inside and is provided with a visual field in at least one direction. A vacuum container in which the addition is transparent; Wiring provided on at least one of the substrates constituting the vacuum container; An insulating layer for preventing unnecessary current flow between the wirings; An anode electrode comprising a fluorescent layer which receives the voltage from the wiring and emits light, and a conductive member which applies the wiring voltage to the fluorescent layer; A filament for emitting hot electrons; And a mesh grid for rapidly diffusing or blocking hot electrons emitted from the filament, wherein the conductive members provided to correspond to the center and the outer portion of the mesh grid have different sizes.

Fluorescent Display Tube, Dot, Challenge, Graphic, Cutoff, Stain

Description

Fluorescent Display Tube {VACUUM FLUORESCENT DISPLAY DEVICE}

1 is an exploded perspective view of a fluorescent display tube according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of main parts of FIG. 1. FIG.

3 is an exploded perspective view of a fluorescent display tube according to another embodiment of the present invention;

4 is a cross-sectional view of an essential part of FIG. 3.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube, and more particularly, to a fluorescent display tube capable of preventing partial spots occurring in a display pattern of a portion adjacent to an end side of a mesh grid.

A fluorescent display tube (VFD), which is a self-luminous display element, typically includes a vacuum container in which a vacuum space part is provided and a view portion in at least one direction is transparent, wiring for electrically connecting the inside of the tube, and wiring. An insulating layer which prevents unnecessary energization of the liver, an anode electrode which is provided in the space portion of the vacuum container and receives electrons and emits light to display a constant signal, and a filament welded and fixed to the support to emit hot electrons by receiving power from the outside; And a mesh grid for accelerating diffusion or blocking hot electrons emitted from the filaments.

In such a fluorescent display tube, the anode electrode is composed of a fluorescent layer which emits light by applying a voltage from a wiring and a conductive member which applies the wiring voltage to the fluorescent layer. The conductive member is usually a conductive layer or a dot layer. Is done.

Here, the conductive layer is adopted when the fluorescent layer is composed of a general number display segment or a dot matrix for character display. The conductive layer is formed larger than the fluorescent layer to form the bottom surface of the fluorescent layer, thereby reducing the wiring voltage. It is applied to a fluorescent layer.

In addition, the dot layer is adopted when the fluorescent layer is configured as a dot matrix for graphic display. The dot layer is provided in a conducting hole (provided in the insulating layer) that is smaller than the fluorescent layer to apply a wiring voltage to the fluorescent layer. .

Accordingly, when a predetermined voltage is applied to the inside of the fluorescent display tube, the fluorescent layer exhibits the characteristics of a circuit anode, and hot electrons emitted while the filament is heated are accelerated and diffused by the mesh grid to impinge on the fluorescent layer to form the fluorescent layer. When light is emitted and the emitted light is irradiated to the outside through a substrate, an image such as a predetermined character or graphic is realized.

By the way, in the above-described fluorescent display tube of the prior art, the size of the conductive members provided in the central and outer fluorescent layers of the plurality of fluorescent layers provided inside one mesh grid are all the same.                         

Therefore, when the cut-off voltage is applied to the neighboring mesh grid in the periphery of the outer fluorescent layer, the flow of hot electrons is disturbed by the cut-off voltage, and thus the electron acceleration action is not good. As a result, spots are generated at the periphery, and spots are generated more as the gap between the outer fluorescent layer and the end of the mesh grid becomes smaller.

Accordingly, an object of the present invention is to provide a fluorescent display tube that can prevent unevenness occurring at the periphery of the outer fluorescent layer adjacent to the end side of the mesh grid.

In order to achieve the above object, the present invention proposes a fluorescent display tube having an enlarged size of a conductive member for applying a wiring voltage to the fluorescent layer on the outer fluorescent layer among the plurality of fluorescent layers provided in one mesh grid.

As a result, in the outer fluorescent layer, the hot electron acceleration action is increased as compared with the central fluorescent layer, so that even when the cut-off voltage is applied to the adjacent mesh grid, staining may be prevented due to the influence of the voltage.

Hereinafter, a fluorescent display tube according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 illustrate an exploded perspective view and a sectional view of an essential part of a fluorescent display tube according to an exemplary embodiment of the present invention.

As illustrated, the fluorescent display tube includes a pair of front and rear substrates 2 and 4 facing each other and a side glass 6 connecting the peripheral portions of the substrates.

The rear substrate 4 has a wiring 8 electrically connecting the inside of the fluorescent display tube, an insulating layer 10 to prevent unnecessary current flow between the wirings, and a fluorescent layer that emits light by applying a voltage from the wiring 8. An anode electrode including (12) and a dot layer 14 for applying the wiring voltage to the fluorescent layer 12 is provided.

Here, the dot layer 14 is provided in the current carrying hole provided in the insulating layer 10.

A plurality of filaments 16 for emitting hot electrons are provided at a predetermined height on a top of the anode electrode by a support (not shown), and the filaments 16 are emitted between the fluorescent layer 12 and the filaments 16. A plurality of mesh grids 18 are provided for accelerating diffusion or blocking hot electrons, and a plurality of fluorescent layers are provided inside each mesh grid.

In the fluorescent display tube having such a structure, the dot layer 14a for applying the wiring voltage to the outer fluorescent layer 12a among the plurality of fluorescent layers provided inside the mesh grid 18b is connected to the fluorescent layer 12b at the center part. The dot layer 14a is formed to be larger than the dot layer 14b to which a voltage is applied. Preferably, the dot layer 14a is formed to be enlarged toward the neighboring mesh grid 18a.

Also preferably, the wiring 8a for applying a voltage to the dot layer 14a is formed larger than the wiring 8b for applying a voltage to the dot layer 14b.

Here, the wiring and dot layers provided inside the mesh grid 18a also have a similar structure to the wiring and dot layers inside the mesh grid 18b.

As such, the wiring 8a and the dot layer 14a for applying a voltage to the outer fluorescent layer are larger than the wiring 8b and the dot layer 14b for applying a voltage to the central fluorescent layer 12b. In order to increase the voltage applied to the outer fluorescent layer, the hot electron acceleration action is increased.

The operation of the fluorescent display tube having the above-described configuration will be described below.

When driving a fluorescent display tube by applying a predetermined driving voltage to the anode electrode, the mesh grid and the filament, when the cut-off voltage is applied to any one of the mesh grids 18a, the cut-off voltage is applied to the mesh grid 18a. ) Generates a repulsive force (-) to push hot electrons emitted from the filament.

Therefore, the supply of hot electrons to the fluorescent layers inside the mesh grid 18a to which the cut-off voltage is applied is cut off, and thus the driving of the fluorescent layers is stopped.

However, the electric force of the repulsive force (-) generated by the cut-off voltage in the cut-off operation as described above also affects the outer fluorescent layers 12a inside the neighboring mesh grid 18b. Therefore, the hot electrons are not supplied to the periphery of the outer fluorescent layer 12a.

However, in the present embodiment, the wiring 8a and the dot layer 14a for supplying voltage to the outer fluorescent layers 12a and the wiring 8b and dot for supplying voltage to the central fluorescent layers 12b are provided. Since it is formed larger than the layer 14b, the hot electron acceleration action in the outer fluorescent layer 12a is made better than before.

3 and 4 illustrate another embodiment of the present invention, and for the sake of simplicity, only portions having different configurations from the embodiments of FIGS. 1 and 2 will be described.                     

As shown, the rear substrate 4 is provided with a wiring 8 for electrically connecting the inside of the fluorescent display tube, and an insulating layer 10 for preventing unnecessary conduction between the wirings, and a conducting hole of the insulating layer 10. The dot layer 14 is provided.

On the upper side of the dot layer 14 and the insulating layer 10 is provided a conductive layer 20 to which a wiring voltage is applied through the dot layer 14, and a known fluorescent layer 12 is provided on the conductive layer 20. It is provided in a small size compared to the conductive layer.

In the fluorescent display tube having such a structure, among the plurality of fluorescent layers 12 provided inside the mesh grid 18b, the conductive layer 20a for applying a wiring voltage to the outer fluorescent layer 12a is the fluorescent layer 12b at the center. Is larger than the conductive layer 20b for applying the wiring voltage. Preferably, the conductive layer 20a is expanded in the neighboring mesh grid direction 18a.

Also preferably, the dot layer 14a for applying a voltage to the conductive layer 20a and the wiring 8a for applying a voltage to the dot layer 14a are provided to the dot layer 14b and the wiring 8b at the center. It is largely formed.

Accordingly, although the outer fluorescent layer 12a inside the neighboring mesh grid 18b is affected by the electric force of the repulsive force (-) generated due to the cut-off voltage applied to the mesh grid 18a, the outer Since the conductive layer (and wiring and dot layer) for supplying voltage to the sub-fluorescence layers 12a is formed larger than the conductive layer (and wiring and dot layer) for supplying voltage to the central fluorescent layers 12b, The hot electron acceleration action in the outer fluorescent layer 12a is better than in the prior art.                     

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

As described above, according to the fluorescent display tube of the present invention, since a large amount of current is supplied to the outer fluorescent layer per unit time compared to the central fluorescent layer, the peripheral portion of the outer fluorescent layer is compared with the conventional and central fluorescent layer. Compared to the hot electron acceleration is more active.

Therefore, it is possible to effectively prevent spots occurring at the periphery of the outer fluorescent layer due to the cut-off voltage.

In addition, even when the cut-off voltage is applied above the cut-off voltage set at the time of designing the fluorescent display tube, the effect (partial spots) due to the cut-off voltage can be prevented.

Claims (13)

A vacuum container provided with a vacuum space portion therein and having a view portion in at least one direction transparent; Wiring provided on at least one of the substrates constituting the vacuum container; An insulating layer for preventing unnecessary current flow between the wirings; An anode electrode comprising a fluorescent layer which receives the voltage from the wiring and emits light, and a conductive member which applies the wiring voltage to the fluorescent layer; A filament for emitting hot electrons; And a mesh grid that accelerates or blocks hot electrons emitted from the filament. And a conductive member provided to correspond to the center and the outer portion of the mesh grid having different sizes. The fluorescent display tube according to claim 1, wherein said conductive member is made of a dot layer provided in a through hole of said insulating layer. 3. The fluorescent display tube according to claim 2, wherein the dot layer of the outer portion is provided larger than the dot layer of the center portion. The fluorescent display tube of claim 3, wherein the dot layer of the outer portion extends in an outer direction of the mesh grid. The fluorescent display tube according to claim 3 or 4, wherein the wiring electrically connected to the dot layer of the outer portion is provided larger than the wiring electrically connected to the dot layer of the central portion. 6. The fluorescent display tube of claim 5, wherein the wiring of the outer portion extends in the outer direction of the mesh grid. 2. The fluorescent display tube according to claim 1, wherein the conductive member is composed of a dot layer provided in the through hole of the insulating layer and a conductive layer provided between the dot layer and the fluorescent layer. 8. The fluorescent display tube according to claim 7, wherein the outer conductive layer is provided larger than the central conductive layer. The fluorescent display tube of claim 8, wherein the conductive layer of the outer portion extends in an outer direction of the mesh grid. 10. The fluorescent display tube according to claim 8 or 9, wherein a dot layer electrically connected to the outer conductive layer is provided larger than a dot layer electrically connected to the central conductive layer. The fluorescent display tube of claim 10, wherein the dot layer of the outer portion extends in an outer direction of the mesh grid. The fluorescent display tube according to claim 10, wherein the wiring electrically connected to the dot layer in the outer portion is provided larger than the wiring electrically connected to the dot layer in the center portion. 13. The fluorescent display tube of claim 12, wherein the wiring of the outer portion extends in the outer direction of the mesh grid.

Images