KR20010035702A - Front luminescent type vacuum fluorescent display - Google Patents

Abstract

PURPOSE: A vacuums fluorescent display is provided to be capable of preventing stain of a hexagonal shape by using of a mesh grid and improving pattern freedom. CONSTITUTION: A side glass(6) is disposed between front and rear substrates(2,4) to form a closed space, and a wire layer(8) is formed on the front substrate to connect the interior of a vacuums fluorescent display(VFD). An anode electrode(10) includes a fluorescent substrate, which forms a predetermined display pattern by emitting light when a power is applied. A filament(16) is installed at a tension state by a support and emits hot electrons when the power is applied. A rib grid electrode(18,20) is prepared outside the anode electrode so as to accelerate the hot electrodes emitted from the filament and make the accelerated hot electrodes collide with the fluorescent substrate.

Description

Front-emitting fluorescent tube {FRONT LUMINESCENT TYPE VACUUM FLUORESCENT DISPLAY}

The present invention relates to a top-emitting fluorescent display tube, and more particularly to a top-emitting fluorescent display tube that can prevent hexagonal irregularities generated by using a mesh grid, and can improve pattern freedom. will be.

In general, a fluorescent display tube (VFD) is a self-luminous display device that emits light by selectively colliding hot electrons emitted from a filament with a fluorescent layer of an anode electrode. It is easy to apply and has high reliability and is used for various purposes in various fields.

The fluorescent display tube is a general type configured to form an anode electrode in a predetermined pattern on a rear substrate according to a display portion and to print phosphors thereon so that the emitted light is displayed to the outside through the transparent front substrate, The anode is formed in a predetermined pattern on the inner surface of the front substrate, and a phosphor is printed thereon. The front emission type (transmissive type) configured to display the emitted light to the outside through the transmissive front substrate is combined with the general type and the front emission type. It is divided into two-sided emission type (stacked type).

Hereinafter, a conventional top emission type fluorescent display tube among the fluorescent display tubes as described above will be described with reference to FIG. 1.

As shown, the front substrate 102 and the rear substrate 104 are arranged in parallel with each other at regular intervals by the side glass 106.

A wiring layer 108 is formed on the inner surface of the front substrate 102 to electrically connect the inside of the fluorescent display tube, and a fluorescent layer having a predetermined display pattern is coated on the wiring layer 108 to form the anode electrode 110. The insulating film 112 is coated on the front substrate 102 except for the portion where the anode electrode 110 is provided.

The wiring layer 108 is formed of indium tin oxcide (ITO) or an aluminum thin film to prevent the display pattern from interfering, and a plurality of filaments 114 coated with carbonate are supported between the anode electrode and the rear substrate. It is installed in a tension state (not shown), and between the anode electrode 110 and the filament 114, the grid electrode 116 of the metal mesh type to accelerate or diffuse or block the hot electrons emitted from the filament 114 ) Is installed.

Accordingly, when a voltage is applied to the anode electrode 110, the filament 114, and the grid electrode 116 through the lead pin 118, the anode electrode 110 exhibits the characteristics of a circuit anode and the filament ( The heat electrons emitted while the 114 is heated are accelerated and diffused by the grid electrode 116 to emit the fluorescent layer of the anode 110, and the emitted light is irradiated to the outside through the front substrate 102. Images such as predetermined characters and symbols are implemented.

By the way, according to the conventional front emission type fluorescent display tube using a mesh type grid electrode as described above. Since the hot electrons emitted from the filament directly observe the light that excites the phosphor, high luminance is obtained, whereas a fine hexagonal mesh spot is formed on the phosphor surface of the phosphor.

This kind of staining cannot be completely removed as long as mesh-type grid electrodes are used. In order to solve this problem, attempts have been made to control the distance (Lg) between the filament and the grid electrode and to increase the conductivity of the phosphor. In other words, this problem is a fundamental problem that is difficult to solve if the exact mechanism of the flow of electrons in the vacuum state is understood and simulation is not achieved.

In addition, this type of fluorescent display tube is limited in the degree of freedom of pattern design by using a grid-type grid electrode.

Accordingly, an object of the present invention is to provide a top-emitting fluorescent display tube which can prevent hexagonal irregularities caused by using a mesh grid and can improve pattern freedom.

1 is a cross-sectional view of a top-emitting fluorescent display tube according to the prior art.

2 is a cross-sectional view of a top-emitting fluorescent display tube according to an embodiment of the present invention.

3 is a cross-sectional view of a top-emitting fluorescent display tube according to another embodiment of the present invention.

The object of the present invention as described above,

A side glass positioned between the front substrate and the rear substrate and these substrates to form a closed space;

A wiring layer provided on the front substrate and electrically connecting the inside of the fluorescent display tube;

An anode including a phosphor which emits light when power is applied to form a predetermined display pattern;

A filament installed in a tension state by the support means and emitting heat electrons when the power is applied;

A rib grid electrode provided on an outside of the anode electrode to accelerate hot electrons emitted from the filament and impinge on the phosphor when power is applied;

It is achieved by a top-emitting fluorescent display tube comprising a.

According to a preferred feature of the invention, the wiring layer is composed of a stripe-like aluminum film or a stripe-like transparent conductive film, the phosphors are provided on the surface of the anode wiring layer, and the grid electrodes are provided in a state spaced apart by a predetermined distance. It consists of two electrodes.

The first and second electrodes may be formed of an insulating partition wall and an aluminum film provided on an end surface of the insulating partition wall, or may be formed of a conductive partition wall, and the electrode may be provided on the surface of the insulating layer provided on the surface of the wiring layer. It is provided on the surface of the conductive layer for thermal electron emission, or is provided on the surface of the wiring layer, the first and second electrodes are formed spaced apart by a distance of 100 ~ 200㎛.

According to the present invention having the characteristics as described above, it is possible to prevent the irregularities of the hexagonal shape generated by using the mesh grid while performing a good thermal electronic control action, it is possible to improve the pattern freedom.

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.

2 is a cross-sectional view of a top-emitting fluorescent display tube according to an embodiment of the present invention, in which the front substrate 2 and the rear substrate 4 are arranged in parallel with each other at regular intervals by the side glass 6. It is.

The wiring layer 8 is formed on the front substrate 2 by a stripe-shaped aluminum thin film or a transparent conductive film (ITO), and the surface of the wiring layer 8 is an insulating layer for preventing unnecessary current flow between the fluorescent layer 10 and the wiring. (12) is provided, and a conductive layer for hot electron emission (14) is provided on the surface of the insulating layer (12).

The surface of the conductive layer 14 is provided with a rib grid electrode for accelerating diffusion or blocking hot electrons emitted from the filament 16 to the fluorescent layer 10, the rib grid electrode has a spacing of 100 ~ 200㎛ And first and second electrodes 18 and 20 provided outside the fluorescent layer 10 while being spaced apart from each other, and the first and second electrodes 18 and 20 are made of an insulating layer 18a having a predetermined height. And 20a and aluminum films 18b and 20b provided on end faces of the insulating layers 18a and 20a.

Although not shown, the first and second electrodes 18 and 20 are configured to draw an electrode to one end of the front substrate 2, and connect the electrode with a lead pin to apply power.

Here, the configuration of the rib grid electrode as described above is to enable a good thermal electronic control action (acceleration, diffusion, blocking).

Accordingly, when voltage is applied to the anode electrode 10, the filament 16, and the rib grid electrodes 18 and 20 through the lead pins 22, the thermal electrons emitted while the filament 16 is heated are first And accelerated diffusion by the second electrodes 18 and 20 to emit the fluorescent layer 10.

When the fluorescent display tube is driven as described above, thermal electrons emitted from the filament are concentrated in the space between the first and second electrodes 18 and 20, and the thermal electrons are emitted to the outside by the conductive layer 14. do.

Therefore, it is possible to prevent the luminance characteristic of the phosphor from deteriorating by the hot electrons focused in the space between the electrodes 18 and 20.

3 is a cross-sectional view of a top-emitting fluorescent display tube according to another embodiment of the present invention. The front substrate 36 is disposed in parallel with each other at a predetermined distance from the rear substrate 34 by the side glass 32. ), A wiring layer 38 is formed of a stripe aluminum thin film or a transparent conductive film (ITO), and a fluorescent layer 40 and a grid electrode are provided on the surface of the wiring layer 38.

The rib grid electrodes for accelerated diffusion or blocking of hot electrons emitted from the filament 42 to the fluorescent layer 40 are provided on the outer side of the fluorescent layer 40 in a state spaced apart from each other at intervals of 100 to 200 μm. The first and second electrodes 44 and 46, the first and second electrodes 44 and 46 are constituted by conductive partition walls having a predetermined height, and the insulating layer 48 is disposed around the first and second electrodes. On the surface of the thermoelectric emission conductive layer 50 is provided.

Accordingly, when voltage is applied to the fluorescent layer 40, the filament 42, and the rib grid electrodes 44 and 46 through the lead pins 52, the hot electrons emitted while the filament 42 is heated are first And accelerated diffusion by the second electrodes 44 and 46 to emit the fluorescent layer 40.

Then, when the fluorescent display tube is driven as described above, hot electrons focused around the first and second electrodes 44 and 46 are emitted to the outside by the conductive layer 50.

Therefore, it is possible to prevent the luminance characteristic of the phosphor from deteriorating by the hot electrons.

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, according to the fluorescent display tube of the present invention, it is possible to prevent hexagonal unevenness generated by using the mesh grid while performing the thermal electronic control function well, and improve the pattern freedom.

Claims (10)

A side glass positioned between the front substrate and the rear substrate and these substrates to form a closed space; A wiring layer provided on the front substrate and electrically connecting the inside of the fluorescent display tube; An anode including a phosphor which emits light when power is applied to form a predetermined display pattern; A filament installed in a tension state by the support means and emitting heat electrons when the power is applied; A rib grid electrode provided on an outside of the anode electrode to accelerate hot electrons emitted from the filament and impinge on the phosphor when power is applied; Front emission type fluorescent display tube comprising a. A top-emitting fluorescent display tube according to claim 1, wherein said wiring layer is made of a stripe aluminum film. The top-emitting fluorescent display tube according to claim 1, wherein the wiring layer is formed of a stripe transparent conductive film. The front emission type fluorescent display tube according to claim 1, wherein the phosphor is provided on a surface of the wiring layer. The top emission type fluorescent display tube according to any one of claims 1 to 4, wherein the grid electrodes are formed of first and second electrodes spaced apart by a predetermined distance. 6. The top-emitting fluorescent display tube of claim 5, wherein the first and second electrodes each comprise an insulating barrier and an aluminum film provided on an end surface of the insulating barrier. The semiconductor device of claim 6, wherein an insulating layer is provided on a surface of the wiring layer, and a conductive layer is connected to the wiring layer to emit hot electrons focused in a space between the first and second electrodes. Full-emitting fluorescent display tube provided. 6. The top-emitting fluorescent display tube of claim 5, wherein the first and second electrodes are formed of conductive barrier ribs. 6. The top-emitting fluorescent display tube of claim 5, wherein the first and second electrodes are provided on a surface of the wiring layer. The front emission type fluorescent display tube of claim 5, wherein the first and second electrodes are spaced apart by a distance of about 100 μm to about 200 μm.