KR100521779B1 - Front Luminescent Vacuum Fluorescent Display - Google Patents

Abstract

Since the support and the mount are not used, the back substrate, the front substrate, and the side glass forming the vacuum container, the cathode formed on the inner surface of the back substrate and the electron emission are formed, and the inner surface of the front substrate so that the manufacturing process is simple and thin. A front-emitting fluorescent display comprising an anode formed in a predetermined pattern and coated with phosphors, a grid installed on the inner surface of the front substrate so as to be positioned between the cathode and the anode, and a plurality of lead wires for supplying power to the anode and the grid. Provide a coffin.

The cathode is applied to the inner surface of the back substrate and is made of tungsten or nickel, and is composed of a cathode electrode that generates heat when power is applied, and a planar electron source that is coated on the cathode electrode and made of carbonate or carbon and emits heat electrons when heated. .

Description

Front-Luminous Fluorescent Display Tube {Front Luminescent 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 form a cathode that emits electrons as a planar electron source, thereby simplifying the structure and reducing material costs.

In general, a fluorescent display tube (VFD) is a self-luminous display device that emits electrons by colliding electrons on an anode, and is capable of multicolor display, can be driven at low voltage, and is easily applied to semiconductor components, and has high reliability. There are many uses in you.

The fluorescent display tube is a general type configured to view the light emitted from the anode formed on the rear substrate through the transmissive front substrate according to the display portion, and the light emitted from the anode formed on the inner surface of the transmissive front substrate through the front substrate. The front emission type (transmissive type) configured to be seen and the double emission type (lamination type) configured to view the light emitted from the anode formed on the inner surface of the back substrate and the front substrate by combining the general type and the front emission type together through the transmissive front substrate ).

In the conventional front-emitting fluorescent display tube as shown in FIGS. 3 and 4, the support bar 15 and the lead wire 9, the rail 14 and the mount 13 are welded to form a frame assembly, and the frame assembly The support body is welded to the mount 13 of the support, the filament 12 and the getter 16 coated with carbonate on the support are welded to form the mount assembly 10, and the wiring layer and the insulating layer are formed on the inner surface of the back substrate 4. The anode 5 is formed by sequentially printing the conductive layer 6 and the fluorescent layer 7, and the grid fixing point and the lead fixing point are printed using silver paste, and then a metal mesh is printed. Side of the grid (8) consisting of assembling and fixing to the grid fixing point, and assembling and fixing the mount assembly (10) to the rear substrate (4) using frit, and assembled using the front substrate (2) and frit The glass 6 is assembled and sealed to the back substrate 4 using frit, and then the support bar 15 is sealed. Is produced through the process of cutting the rails 14 of the lead wire (9).

The conductive layer 18 is formed on the inner surface of the rear substrate 2 by applying carbon or the like to move the hot electrons emitted from the filament 12 toward the rear substrate 2 toward the anode 5.

In the front light emitting fluorescent display tube configured as described above, when a voltage is applied to the filament 12 through the lead wire 9, the hot filaments 12 are heated, and the hot electrons are emitted. Accelerated diffusion by the grid 8 impinges on the phosphor 7 of the anode 5 to emit light, and the emitted light is irradiated through the front substrate 2 so that an image of a predetermined character or symbol is realized. do.

In the conventional front emission type fluorescent display tube having the above structure, the anode 5, the grid 8, and the mount assembly 10 are installed on the inner surface of the front substrate 4, and carbon is coated on the inner surface of the conductive layer. The side glass 3 is attached using frit along the edge of the back substrate 4 on which the 18 is formed, and then the side glass 3 is attached to the front substrate 4 using the frit. The manufacturing process is complicated because it is manufactured through a process of performing vacuum and sealing.

In addition, since the support bar 15 and the rail 14 formed of expensive metal, such as stainless steel, are used to increase the cost due to material costs, and the support bar 15 and the rail 14 are cut and discarded. There is a lot of material loss.

Since the filament 12 is applied with a voltage to generate a high temperature to emit hot electrons, the filament 12 needs to be fixed to a support fixed to the mount 13 to have a predetermined tension. This is time consuming and manufacturing costs rise.

In addition, since the filament 12 must be supported by a predetermined tension to absorb a portion of the filament 12 even when thermal expansion occurs using the support and the mount 13, the display area is reduced by the portion where the support and the mount 13 are installed. As a result, the display area is smaller than the size of the back substrate 2 and the front substrate 4.

In addition, the metal parts such as the support and the mount 13 are made of expensive stainless steel or nickel-chromium alloys, so that the cost of materials is high, the cost is difficult, and various manufacturing facilities for processing and welding metal parts. Is needed.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and to provide a front-emitting fluorescent display tube which is simple in manufacturing process and can be made thin because a cathode is formed of a planar electron source and no support and mount are used.

The front light-emitting fluorescent display tube proposed by the present invention includes a back substrate, a front substrate and a side glass forming a vacuum container, a cathode formed on the inner surface of the rear substrate and emitting electrons, and a predetermined surface on the inner surface of the front substrate. An anode formed in a pattern of which a phosphor is coated, a grid installed on an inner surface of the front substrate to be positioned between the cathode and the anode, and a plurality of lead wires for applying power to the anode and the grid; Is done.

The cathode is formed of a cathode electrode which is coated on the inner surface of the back substrate and generates heat when power is applied, and a planar electron source that is applied on the cathode electrode and heated to emit heat electrons.

The cathode electrode is made of tungsten, nickel, or the like, and the plane electron source is made of carbonate, carbon, or the like.

Next, the most preferred embodiment of a top-emitting fluorescent display tube according to the present invention will be described in detail with reference to the drawings.

First, as shown in FIGS. 1 and 2, one embodiment of the front-emitting fluorescent display tube according to the present invention includes a back substrate 22, a front substrate 20, and a side glass 24 forming a vacuum container, and A cathode 50 formed on the inner surface of one back substrate 22 and emitting electrons, an anode 30 formed in a predetermined pattern on the inner surface of the front substrate 20 and coated with a phosphor, and the cathode Grid 40 is installed on the inner surface of the front substrate 20 to be located between the 50 and the anode 30, and a plurality of lead wires for applying power to the anode 30 and the grid 40 And 42.

The cathode 50 is coated on the inner surface of the back substrate 22 and the cathode electrode 52 which generates heat when the power is applied, and the plane that emits hot electrons when heated and applied on the cathode electrode 52. It consists of an electron source 54.

The cathode electrode 52 is made of tungsten, nickel, or the like.

That is, the cathode electrode 52 is formed by printing tungsten paste (W paste) or nickel paste (Ni paste) or the like on the inner surface of the back substrate 22, drying and firing.

The planar electron source 54 is made of carbonate, carbon, or the like.

That is, the planar electron source 54 is formed by printing a carbonate paste or a carbon paste on the cathode electrode 52, drying and baking.

In addition, the lead wire 56 for applying power to the cathode electrode 52 is formed in a step shape and fixedly installed by using a frit sealing the space between the front substrate 20 and the side glass 24.

The lead wire 56 is provided such that the stepped end portion of the lead wire 56 is in contact with the cathode electrode 52 printed on the rear substrate 22.

The lead wire 56 is provided with a getter 58 for forming a getter film in order to increase the degree of vacuum.

The anode 30 has a plurality of stripes formed on the inner surface of the front substrate 20 and the anode electrode 32 which is electrically connected to the wiring layer is formed using aluminum or the like, and the anode electrode 32 The phosphor 34 is coated on the front substrate 20, except for the portion where the anode electrode 32 is formed, to shield the anode electrode 32 and block external light to improve display contrast. 36).

Therefore, only the phosphor 34 coated on the stripe side formed on the anode electrode 32 is visible from the outside of the front substrate 20.

In the front emission type fluorescent display tube according to the present invention configured as described above, when power is applied through the lead wires 56 and 42, the cathode electrode 52 of the cathode 50 generates heat and flat electrons. The circle 54 is heated, and hot electrons are emitted from the heated planar electron source 54.

As described above, the hot electrons emitted from the planar electron source 54 are accelerated and diffused by the grid 40 to proceed to the anode 30, and collide with the phosphor 34 of the anode 30 to cause the phosphor 34. Excited to emit light, a predetermined image is realized by the emitted light is irradiated to the outside through the front substrate 20.

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.

According to the front-emitting fluorescent display tube according to the present invention made as described above, since the mount, the support and the support bar are not used, the material cost is reduced, the manufacturing process is simplified, and the productivity is improved.

In addition, since the structure for supporting the filament by using the support and the mount is not used, the display area can be increased and the thickness can be reduced as much as the portion where the support and the mount are installed, so that the thickness can be reduced.

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

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

Figure 3 is an exploded perspective view showing a conventional top-emitting fluorescent display tube.

4 is a cross-sectional view showing a conventional top-emitting fluorescent display tube.

Claims (4)

A back substrate, a front substrate and a side glass forming a vacuum container, a cathode formed on an inner surface of the back substrate and emitting electrons, an anode formed in a predetermined pattern on an inner surface of the front substrate and coated with a phosphor; And a grid installed on an inner surface of the front substrate so as to be positioned between the cathode and the anode, and a plurality of lead wires for applying power to the anode and the grid. The front light emitting device of claim 1, wherein the cathode is coated on an inner surface of the rear substrate and has a cathode electrode that generates heat when power is applied, and a planar electron source that is heated on the cathode electrode and emits hot electrons when heated. Fluorescent tube. 3. A top-emitting fluorescent display tube according to claim 2, wherein said cathode electrode is made of tungsten or nickel. The front emission type fluorescent display tube according to claim 2, wherein the planar electron source is made of carbonate or carbon.