KR20010068429A - Vacuum fluorescent display device having wire grid - Google Patents

Abstract

PURPOSE: A vacuum fluorescent display tube having a wire grid is provided to prevent a wrong arrangement by a movement of a wire grid by including a fixed mount in a dummy grid and fixing the wire grid to a mounting glass. CONSTITUTION: In a vacuum fluorescent display tube having a wire grid, a pairs of glass substrates(4,6) are included in a vacuum container with a side glass. A cathode(8) is mounted in the vacuum container to emit thermal electrons upon applying power. An anode electrode(10) is formed in any one of the substrates and has a fluorescent layer on the surface thereof. A wire grid(14) is fixed to the both side ends of the substrate having the anode electrode to accelerate or block the thermal electrons emitted from the cathode depending on a supply power. A pairs of mounting glasses(24) are located between the substrate and the wire in the outer plane of the display area to maintain the wire to a desired height from the fluorescent layer. A fixing device(36) is provided to a most outside wire bounded to the end of the mounting glass among a plurality of wires to pressure the side part of the mounting glass, thereby fixing the wire grid to the mounting glass.

Description

Vacuum fluorescent display device having wire grid}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube having a wire grid, and more particularly, a fixed support on a dummy grid, so that the wire grid can be mounted more accurately and easily by fixing the wire grid to the mounting glass before applying frit. It relates to a fluorescent display tube.

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.

Such fluorescent display tubes are classified into dipoles, triodes, and quadrupoles according to their structure, and are generally composed of a cathode (filament) that emits hot electrons, an anode electrode coated with phosphor, and a grid electrode that controls the direction of hot electrons. The polar tube structure is widely used.

The grid electrode is installed between the cathode and the anode electrode to accelerate and diffuse hot electrons emitted from the cathode when the positive voltage is applied or to reach the anode electrode or vice versa when the negative voltage is applied. It serves to block electrons directed to the electrode.

The grid electrode having such a function is made of a metal mesh etched from a thin film of stainless or the like so as not to interfere with the display, or a so-called lip formed of a conductive film on a conductive partition wall or an insulating partition wall formed at a predetermined height around a specific anode electrode pattern. -Ribbed-grid type, or consists of a wire grid composed of a plurality of wires.

In the fluorescent display tube having a wire grid, a part of the rear substrate is shown in FIG. As shown, the wire grid is composed of a pair of grid supports 1 and a plurality of wires 3 at both ends fixed to the pair of grid supports 1, respectively, the anode electrode 5 and the fluorescent layer 7 The plurality of wires 3 are fixed to the back substrate 9 on which the wires are formed.

This controls the electrons emitted from the cathode by regulating the voltage applied to the wires 3. Unlike the metal mesh, the wire grids are composed of extremely thin wires 3, so careful attention is paid to the mounting process fixed to the substrate. Required.

In order to overcome the mounting difficulties caused by the characteristics of the wire grid itself, a pair of mounting glasses 11 are generally provided outside the display area of the rear substrate 9 so that the fluorescent layer 7 and the wire 3 are separated from each other. A method of fixing a wire grid to a substrate while maintaining a constant gap is used.

FIG. 3 is a side view of the wire grid. The mounting process of the wire grid using the mounting glass 11 first fixes a pair of mounting glasses to the rear substrate 9 using the first frit 13, and then a plurality of wires ( Position the pair of grid supports 1 on the rear substrate 9 without deformation so that 3) is placed on the pair of mounting glasses 11, and then in this state the second frit on the mounting glass 11 on which the wires 3 are placed. (15) is applied to fix the wire 3 and the mounting glass 11 integrally, and cut the other grid support (1) except the grid pin (17).

However, in the wire grid mounting process, since the wire grid is only mounted on the mounting glass and then fixed by the frit, moving the substrate before the wire grid is fixed by the frit causes the wire grid to move so that misalignment is avoided. It has caused a problem of lowering the yield of the fluorescent display tube due to poor mounting.

Therefore, the present invention is designed to solve the above problems, an object of the present invention is to provide a fixed support on the dummy grid to prevent the misalignment due to the movement of the wire grid by fixing the wire grid to the mounting glass before applying frit In addition, the present invention provides a fluorescent display tube that can more accurately and easily mount a wire grid.

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

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a plan view of the rear substrate;

4 is an enlarged perspective view of part 3B.

5 is a sectional view taken along the line F-F in FIG. 4;

6 is a plan view of a rear substrate of a fluorescent display tube according to the prior art;

7 is a side view of FIG. 6;

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;

An anode electrode formed on one of the substrates and having a fluorescent layer on the surface thereof;

A wire grid fixed to both ends of the substrate on which the anode electrode is formed and accelerating or blocking hot electrons emitted from the cathode according to an applied voltage;

A pair of mounting glass disposed between the substrate and the wire outside the display area to maintain the wire at a predetermined height from the fluorescent layer;

It is provided on the outermost wire which is in contact with the end of the mounting glass of the plurality of wires, and provides a fluorescent display tube including a means for pressing the side portion of the mounting glass to secure the wire grid to the mounting glass.

The means consists of a fixed support extending vertically from the outermost wire toward the outside of the display tube, wherein the fixed support is in contact with the fitting and the rear substrate vertically bent in the outermost wire to contact the side of the mounting glass. It consists of a frit coating portion bent vertically at the fitting portion.

In particular, the fitting portion may be bent at an angle of 90 ° or more from the outermost wire so that the wire grid may be firmly fixed to the mounting glass by pressing the side portion of the mounting glass by the elastic restoring force of the fitting portion itself in contact with the mounting glass.

As a result, the substrate on which the wire grid is placed can be freely moved before the frit coating, and the automatic mounting is possible as the wire grid remains fixed to the substrate.

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

FIG. 1 is an exploded perspective view of a fluorescent display tube according to the present embodiment, and FIG. 2 is a cross-sectional view taken along the line A-A of FIG.

As shown, the fluorescent display tube includes a front substrate 4 and a rear substrate 6 constituting a vacuum container together with the side glass 2, a cathode 8 that emits hot electrons when voltage is applied, and a rear substrate ( The anode electrode 10 and the fluorescent layer 12 formed in 6) and a wire grid 14 mounted on the rear substrate 6 and controlling hot electrons emitted from the cathode 8 are formed.

The cathode 8 consists of a filament 16 coated with an oxide of barium, strontium and potassium on an extremely thin tungsten core wire so as not to interfere with the display, and these filaments 16 are formed by a pair of filament supports 18. Supported by constant tension

The anode electrode 10 is electrically connected to an external circuit by contacting the wiring layer 22 by the conduction hole 20a formed in the insulating layer 20, and the fluorescent layer 12 formed on the surface of the anode electrode 10 The hot electrons emitted from the filament 16 are received to emit light to perform a predetermined display.

The wire grid 14 is installed such that a plurality of wires cross the entire back substrate 6 on which the anode electrode 10 is formed.

The wire grid 14 is maintained at a constant height from the fluorescent layer 12 by a pair of mounting glasses 24 attached to the rear substrate 6, the mounting glass 24 being indicative of the rear substrate 6. It is formed outside the region and is fixed to the rear substrate 6 by the first frit 26.

According to the above-described configuration, a predetermined voltage is applied to the cathode 8 and the anode electrode 10 through the cathode pin 28 and the anode pin 30, and to the respective wires through the grid pin 32. When a voltage is applied, the filament 16 is heated to about 600 ° C. to emit hot electrons, and the emitted hot electrons are accelerated by the positive voltage applied to the anode electrode 10 and the wire grid 14 to emit the fluorescent layer. In this case, movement to the fluorescent layer 12 is blocked when a negative voltage is applied to the wire grid 14.

As a result, predetermined display can be performed by controlling the light emission / non-emission of the fluorescent layer 12, and the light generated in the fluorescent layer 12 is transmitted to the outside through the transparent front substrate 4.

At this time, the fluorescent display tube according to the present embodiment is the outermost wire, that is, the display to securely fix the wire grid 14 to the mounting glass 24 before the wire grid 14 is mounted on the rear substrate 6. The fixed support 36 is provided on the dummy grid 34 located outside the area, which will be described in more detail as follows.

3 is a plan view of a rear substrate, and FIG. 4 is an enlarged perspective view of part 3B.

As shown in the drawing, the fixed support 36 extends from the dummy grid 34 in contact with the end of the mounting glass 24 toward the outside of the display tube, and presses the side portion of the mounting glass 24 to press the wire grid 14. Serves to fix the mounting glass 24.

More specifically, the fixing support 36 is a fitting portion 36a bent vertically downward in the dummy grid 34 so as to be in contact with the side portion of the mounting glass 24, and the outside of the display tube in the fitting portion 36a. It consists of a frit coating portion 36b which is bent vertically toward and in contact with the rear substrate 6.

As shown in FIG. 5, the fitting portion 36b is bent at an angle of 90 ° or more in the dummy grid 34 so that the angle α with the dummy grid 34 is 90 ° or less. This is because when the wire grid 14 is fixed to the mounting glass 24, the fitting portion 36a presses the side surface of the mounting glass 24 with its elastic restoring force so that the mounting glass 24 can be mounted on the mounting glass 24. Because it can be fixed firmly.

The frit coating portion 36b extending from the fitting portion 36a is then applied to the second frit 38 to become a portion where the wire grid 14 is fixed to the rear substrate 6.

The fixed support 36 having such a configuration has a dummy grid 34 corresponding to four intersections, that is, B, C, D, and E portions where the dummy grid 34 on both sides and the pair of mounting glasses 24 meet. It is preferably formed on the side of the.

Here, the dummy grid 34 on both sides where the fixing support 36 is formed is made of wire, and as shown, one side of the dummy grid 34 is formed to have a width wider than that of the general wire so as to be in contact with the end of the mounting glass 24. At the end of (24) it is more stable position.

According to this configuration, the wire grid 14 having the fixed support 36 is provided, and the four fitting portions 36a provided on the wire grid 14 are placed on the pair of mounting glass 24 side surfaces, Pressing the fixed support 36 by applying a constant force, the fitting portion 36a is fitted to the outside of the side of the mounting glass 24 to fix the wire grid 14 to the mounting glass 24.

As described above, since the fitting portion 36a is formed to be bent at an angle of 90 ° or more from the dummy grid 34, the fitting portion 36a presses the side surface of the mounting glass 24 by its elastic restoring force to wire the wire. The grid 14 is firmly fixed to the mounting glass 24.

The wire grid 14 is fixed to the mounting glass 24 by the above process, and one wire support 40 is cut, and then the rear substrate 6 is moved to the mounting process, and the frit coating unit 36b is provided. The second frit 38 is applied over to finally complete the mounting process of the wire grid 14.

Insert the wire grid 14 to the mounting glass 24 in the same process as above, move the rear substrate 6 to the mounting process, and then apply a second frit 38 over the frit coating unit 36a to apply the wire grid ( 14) and a third frit 42 is applied over the mounting glass 24 on which the wire is placed to final seal the wire grid to complete the mounting process of the wire grid.

At this time, since the frit coating portion 36b also maintains a fixed state on the rear substrate 6 together with the fitting portion 36a, automatic mounting is possible, and an advantage of performing the mounting process more accurately is provided. Have

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 fluorescent display tube according to the present invention may form a fixed support on the dummy grid to securely fix the wire grid to the rear substrate before frit coating.

As a result, misalignment due to the movement of the wire grid can be prevented, the rear substrate can be freely moved before the mounting process, and automatic mounting is possible, thereby improving the manufacturing yield of the fluorescent display tube.

Claims (5)

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; An anode electrode formed on one of the substrates and having a phosphor layer on a surface thereof; A wire grid fixed to both ends of the substrate on which the anode electrode is formed and accelerating or blocking hot electrons emitted from the cathode according to an applied voltage; A pair of mounting glass disposed between the substrate and the wire outside the display area to hold the wire at a predetermined height from the fluorescent layer; And a means provided on the outermost wire in contact with the end of the mounting glass among the plurality of wires, the means for pressing a side portion of the mounting glass to fix the wire grid to the mounting glass. The method of claim 1, The means consists of a fixed support extending vertically from the outermost wire toward the outside of the display tube, And the fixing support includes a fitting portion bent vertically at the outermost wire to contact the side portion of the mounting glass and a frit coating portion bent vertically at the fitting portion to contact the rear substrate. The method of claim 2, And an angle between the outermost wire and the fitting portion respectively contacting the top and side surfaces of the mounting glass is 90 ° or less. The method of claim 2, And the outermost wire is formed to have an enlarged width such that one side thereof contacts the end of the mounting glass. The method of claim 2, And the fixing support is formed at four intersections where the outermost wire and the pair of mounting glass ends meet.