KR20010068428A - Dual layer type vacuum fluorescent display device - Google Patents

Abstract

PURPOSE: A double light emission type VFD(Vacuum Fluorescent Display) is provided to prevent the degradation of display quality due to double metal mesh by forming a conductive layer on an insulating barrier instead of a metal mesh as a grid electrode. CONSTITUTION: A pair of glass substrates(4,6) form a vacuum vessel together with a side glass(2). A cathode(8) is mounted within the vacuum vessel to emit hot electrons when voltage is applied. A first display part(A) is formed on one of the two substrates. A second display part(B) is formed to oppose the first display part on the other substrate. In this structure, the first display part has a three-pole tube structure and the second display part has a two-pole tube structure. The first display part(A) consists of an anode(10) on which a fluorescent layer(12) is formed, and a grid electrode(14) of metal mesh type which is arranged to surround the anode.

Description

Dual layer type vacuum fluorescent display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided light emitting fluorescent display tube. More particularly, a conductive film is formed on an insulating partition wall instead of a metal mesh as a grid electrode on a substrate, or a bipolar tube structure without a grid electrode is formed to form a double metal mesh. A double-sided light emitting fluorescent display tube which prevents deterioration of visibility and deterioration of display quality.

In general, a vacuum fluorescent display (VFD) is a self-luminous display device that emits electrons by colliding electrons on a phosphor of an anode, and can be driven at a low voltage so that it is easy to apply semiconductor components and has high reliability and various uses in various fields. Is being used.

The fluorescent display tube is a general type configured to form an anode electrode and a fluorescent layer in a predetermined pattern on a rear substrate, and the emitted light is displayed to the outside through the transparent front substrate, and an anode in a predetermined pattern on the inner surface of the transparent front substrate. Light emitted by forming a fluorescent layer with an electrode is classified into a front emission type (transmissive type) configured to be displayed to the outside through a transparent front substrate, and a double-sided emission type (stacked type) combining the general type and the top emission type.

Among these, the double-sided light emitting fluorescent display tube, as shown in FIG. 4, has a front glass 3, a rear substrate 5, and a front substrate 3 that form a vacuum container together with the side glass 1. And an anode electrode 7 and a fluorescent layer 9 formed on the back substrate 5 and forming a display pattern, respectively, and a cathode 11 provided on any one of the substrates to emit hot electrons when power is applied. And grid electrodes 13 respectively provided on the substrate to accelerate or block hot electrons emitted from the cathode 11.

Here, the front substrate 3 is made of transparent glass to transmit light of the fluorescent layer formed on the rear substrate 5, and the anode electrode formed on the front substrate 3 has an extremely fine stripe pattern, and each anode electrode Wiring layer not shown is made of a very fine aluminum or carbon thin film.

In addition, the grid electrode 13 is formed of a conventional metal mesh etched metal thin film, the support portion of the metal mesh is fixed to the substrate to surround the anode electrode 7 of a specific pattern to surround the anode electrode 7 .

As such, the metal mesh serving as the grid electrode 13 is provided on the front substrate 3 and the rear substrate 5, respectively, and when two metal meshes overlap the inside of the display tube, light is emitted from the fluorescent layer of the rear substrate 5. The light is partially blocked by the overlapping metal mesh, and is shown to the user in a state of being stained in the shape of the metal mesh.

As a result, the double-sided luminescent fluorescent display tubes of the past have not only reduced light transmittance due to overlapping metal meshes but also reduced visibility of the display state, and display quality was reduced by display stains. Since more metal meshes have to be formed, the visibility has been further reduced depending on the viewing angle of the display tube.

Therefore, the present invention was devised to solve the above problems, and an object of the present invention is to form a bipolar tube structure without a grid electrode on either substrate to prevent deterioration of visibility and deterioration of display quality due to a double metal mesh. It is to provide a fluorescent fluorescent tube.

Another object of the present invention is to provide a double-sided light emitting fluorescent display tube in which a conductive film is formed on an insulating partition wall instead of a metal mesh as a grid electrode on one substrate to prevent deterioration of visibility and deterioration of display quality due to a double metal mesh.

1 is a cross-sectional view of a double-sided light emitting fluorescent display tube according to a first embodiment of the present invention.

2 is a cross-sectional view of a double-sided light emitting fluorescent display tube according to a second embodiment of the present invention.

3 is a cross-sectional view of a double-sided light emitting fluorescent display tube according to a third embodiment of the present invention.

4 is a cross-sectional view of a double-sided light emitting fluorescent display tube according to the prior art;

In order to achieve the above object, the present invention,

In addition to the side glass, a pair of glass substrate constituting the vacuum vessel,

A cathode mounted inside the vacuum vessel and emitting hot electrons when a voltage is applied;

A first display unit formed on any one of the substrates;

A second display unit provided on the other one of the substrates in a position facing the first display unit;

The first display part has a triode structure, and the second display part has a bipolar tube structure.

The first display unit includes an anode electrode and a metal mesh-type grid electrode, and the second display unit includes only an anode electrode to directly accelerate hot electrons emitted from the cathode, or a rib-grid surrounding a specific anode electrode pattern ( rib-grid) may further include a grid electrode.

This can effectively prevent deterioration of visibility and deterioration of display quality due to the double metal mesh.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a double-sided light emitting fluorescent display tube according to a first embodiment of the present invention. As shown in the drawing, the fluorescent display tube, together with the side glass 2, forms the front substrate 4 and the rear substrate. (6), a cathode (8) for emitting hot electrons when voltage is applied, a first display portion (A) formed on the inner surface of the front substrate (4), and a second display portion (B) formed on the rear substrate (6). )

The cathode 8 is made of a filament coated with an oxide of barium, strontium and potassium on an extremely thin tungsten core wire so as not to interfere with the display. The cathode 8 is supported by a suitable tension by a filament support (not shown).

The first display portion A includes a first anode electrode 10 formed in a fine stripe pattern on the inner surface of the front substrate 4, and a first fluorescent layer coated in a predetermined pattern on the first anode electrode 10. And the first anode electrode 10 is electrically connected to an external circuit through a wiring layer (not shown).

In addition, a metal mesh type grid electrode 14 is disposed while surrounding the specific first anode electrode 10 pattern. The grid electrode 14 has a supporting portion 14a fixed to the substrate and connected to the lead member through a connecting portion (not shown).

The second display portion B formed on the rear substrate 6 corresponding to the first display portion A includes a second anode electrode 18 and a second anode electrode formed in a predetermined pattern on the insulating layer 16. It consists of the 2nd fluorescent layer 20 apply | coated on (18). The second anode electrode 18 is electrically connected to an external circuit in contact with the wiring layer 22 by the conduction hole 16a.

In this case, the second display portion B is not provided with a grid electrode 14 and has a bipolar tube structure for controlling light emission of the second fluorescent layer 20 by voltage control applied to the second anode electrode 18.

According to the above configuration, when a predetermined voltage is applied to the members through the respective lead members, hot electrons are emitted from the cathode 8, and the emitted hot electrons are the first anode electrode 10 and the grid electrode 14. Accelerated by the positive voltage applied thereto, the first fluorescent layer 12 emits light. As a result, the light emitted from the first fluorescent layer 12 is transmitted to the outside through the transparent front substrate 4.

At the same time, the hot electrons emitted from the cathode 8 are accelerated by the positive voltage applied to the second anode electrode 18 to emit the second fluorescent layer 20. As a result, the light emitted from the second fluorescent layer 20 passes through the inside of the fluorescent display tube and is transmitted to the outside through the transparent front substrate 4.

Here, the double-sided light emitting fluorescent display tube according to the present embodiment excludes the metal mesh type grid electrode and forms the second display portion B of the bipolar tube structure so that the light emitted from the second fluorescent layer 20 is reduced to the front substrate ( It is transmitted to the outside through one grid electrode 14 formed in 4) and the transparent front substrate 4.

This prevents the phenomenon that the display pattern is smeared or the light transmittance is lowered by the metal mesh arranged in a double manner as before, thereby improving the display quality and visibility.

As described above, in the present embodiment, the first display portion A and the second display portion B are formed on the front substrate and the rear substrate, respectively, but as shown in FIG. 2, the first display portion A and the second display portion. Embodiments in which (B) are formed on the rear substrate 6 and the front substrate 4, respectively, are possible. In this case, the second display portion B formed on the front substrate 4 reduces the visibility of the rear substrate 6. In order to minimize, it is important to maintain the maximum transparency while minimizing the width of the first anode electrode 18 and the wiring layer.

3 is a cross-sectional view of a double-sided light emitting fluorescent display tube according to a third embodiment of the present invention, and the same reference numerals are used for the same components as the above-described embodiment.

As shown, the fluorescent display tube according to the present embodiment is formed on the insulating partition wall 24 and the insulating partition wall 24 in the second display portion B formed on the rear substrate 6 in the configuration of the first embodiment. A conductive film 26 is further provided. That is, in the fluorescent display tube according to the present embodiment, a rib-grid type grid electrode is formed in the second display portion B. FIG.

In more detail, the insulating partition wall 24 is formed to have a predetermined height while surrounding the specific second anode electrode 18 pattern, and the conductive film 26 formed on the insulating partition wall 24 is formed by means not shown. By a specific lead member and electrically connected to an external circuit.

If the insulating barrier rib 24 and the conductive film 26 are formed instead of the metal mesh type grid electrode as described above, the fine pattern design and the polygon are compensated for by the disadvantage of the metal mesh, which is disadvantageous for the fine pattern design and not applicable to the complex polygonal pattern. Pattern design has the advantage of being easier.

According to the above configuration, when a predetermined voltage is applied to the second anode electrode 18 and the conductive film 26, the hot electrons emitted from the cathode 8 are transferred to the conductive film 26 and the second anode electrode 18. Accelerated by an applied positive voltage to emit the second fluorescent layer 20, and the light emitted from the second fluorescent layer 20 is transmitted to the outside through the fluorescent display tube and the transparent front substrate 4. .

As described above, the present embodiment forms a rib grid instead of the metal mesh type grid electrode on the second display portion B to open the second display portion B, thereby preventing light transmittance from being caused by the metal mesh and unevenness of the display pattern. The display quality of the fluorescent display tube can be improved.

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 the range of.

As described above, the double-sided light emitting fluorescent display tube according to the present invention excludes a metal mesh type grid electrode from the rear substrate, forms an insulating partition and a conductive film, or forms only an anode electrode so that the second fluorescent layer is covered by the metal mesh. prevent.

As a result, the display pattern implemented by the second display unit formed on the rear substrate is transmitted to the outside only through one grid electrode formed on the front substrate. It is possible to effectively improve the visibility and display quality of the fluorescent display tube.

Claims (7)

A pair of glass substrates which together with the side glass constitute a vacuum container; A cathode mounted inside the vacuum vessel and emitting hot electrons when a voltage is applied; A first display unit formed on any one of the substrates; A second display unit provided on the other one of the substrates in a position facing the first display unit; And a first display portion having a triode structure, and a second display portion having a dipole structure. The method of claim 1, An anode electrode having a fluorescent layer formed on a surface thereof; A double-sided light emitting fluorescent display tube comprising a metal mesh type grid electrode arranged to surround a specific anode electrode pattern. The method of claim 1, And the second display unit is formed of an anode electrode having a fluorescent layer formed on a surface thereof. The method of claim 1, And a first display portion disposed on a front substrate and a second display portion disposed on a rear substrate. The method of claim 1, And the first display unit is disposed on the rear substrate, and the second display unit is disposed on the front substrate. The method of claim 1, And the second display unit further comprises an insulating partition wall disposed to surround a specific anode electrode pattern and a conductive film formed on the insulating partition wall. The method of claim 6, And a first display portion disposed on a front substrate and a second display portion disposed on a rear substrate.