KR20050028515A - Vacuum fluorescent display - Google Patents

Abstract

A vacuum fluorescent display tube is provided to permit filaments to be supported in a stable manner even in case where the vacuum fluorescent display tube is made large. A vacuum fluorescent display tube comprises a plurality of filaments(7) disposed in a vacuum container(31) so as to emit thermal electrons. Each of the filaments has both ends fixed at a filament support(9) which is fixed on a substrate of the vacuum container. One or more dampers(13) are connected to the filaments on the substrate of the vacuum container. Each of the dampers is made of non-conductors fixed on the substrate and connected to the filaments.

Description

Fluorescent Display Tube {VACUUM FLUORESCENT DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube (VFD), and more particularly, to a structure for fixing a filament as a cathode in the fluorescent display tube.

Fluorescent display tubes are generally divided into various types according to their structure, display method, display content, and driving method, and are typically divided into dipole, triode, and quadrupole tubes according to the electrode structure of the fluorescent display tube. However, structurally, the triodes are the most widely manufactured among the above-described forms, and the present invention will be described with reference to the fluorescent display tubes of the triode form.

The fluorescent display tube is a display device developed from a vacuum tube such as a cathode ray tube. The fluorescent display tube is configured on an anode by accelerating hot electrons emitted from a cathode composed of a plurality of filaments that emit hot electrons in the vacuum tube. It is a self-luminous display element that uses light generated when it collides with a phosphor, and the light emitting display is clear, multi-color display is easy, and the pattern design freedom is large, and the operating voltage is high. As it is relatively low and can be driven at low voltage, it is easy to apply a semiconductor component, and has high reliability and excellent environmental resistance, so it is used for various purposes in various fields.

As is well known, a conventional tripolar fluorescent display tube is formed of a front substrate, a rear substrate, and a side glass, and includes a cathode electrode in a vacuum vessel which makes at least one of the front substrate and the rear substrate transparent. The anode electrode and the grid are arranged as a base electrode, and the phosphor is disposed on at least one of the substrates in an arbitrary pattern, so that the electrons emitted from the cathode electrode are generated by the light impinging on the phosphor. It is comprised so that arbitrary images may be implemented.

Among the components constituting the existing fluorescent display tube, in particular, the filament constituting the cathode electrode is disposed in the vacuum container, each end of which is fixed to the filament support firmly mounted at both ends on the rear substrate do. By the way, between the filament support, in other words, a structure for supporting the filament is not formed on the display area formed in the vacuum vessel, so that the filament is installed in a suspended structure having a shape floating on the rear substrate.

The support structure of the filament can be applied to a small fluorescent display device having a small size without any problem. However, as the display display device is recently advanced, the fluorescent display device has also become larger. If the structure of the filament mounted in the suspended state is applied to the fluorescent tube having a larger size, the vibration or vibration caused by the external factor is more likely to be applied to the filament that cannot be supported only at both ends thereof. Severe tremors or vibrations may be caused.

As a result, when the fluorescent display tube having the above-mentioned problems substantially acts in the environment in which the above-mentioned vibration or vibration occurs, electrons to be diffused and accelerated in the intended phosphor pattern are not transferred to the correct position, and the movement path is The separation of the undesired fluorescent material by hitting the light and causing it to emit light causes the occurrence of color spots, which in turn increases the likelihood of color staining, resulting in an unsuitable structure for large fluorescent display tubes.

In order to prevent such a problem, there has been proposed a fluorescent display tube having a structure in which a part in which a filament is disposed in a vacuum container is divided into a plurality of parts, and a structure supporting each of the filaments according to the divided area. As the structure must be provided in a large amount, the cost of the fluorescent display tube increases due to the increase in the number of products, and the productivity is reduced due to the complexity of the work.

Accordingly, an object of the present invention is to provide a fluorescent display tube capable of supporting a filament in a stable state even when the fluorescent display tube is enlarged.

In order to achieve the above object, the fluorescent display tube according to the present invention,

A plurality of filaments for discharging hot electrons are disposed in a vacuum container, and the filaments are fixed at both ends to a filament support fixedly installed on a substrate forming the vacuum container, and the filaments are formed on the substrate forming the vacuum container. At least one damper to be connected is arranged.

The damper is made of a non-conductor fixedly installed on the substrate and connected to the filament, the filament is fixed to the damper by a fleet applied to the upper surface of the damper.

Such non-conductor may be made of glass.

The vacuum container may be formed including a first substrate, a second substrate disposed at a predetermined distance from the first substrate, and a side wall disposed between the first substrate and the second substrate, wherein The damper is supported by the first substrate and is installed, and one side of the damper on which the filament is fixed, the post supported by the second substrate to maintain the cell gap of the vacuum vessel together with the damper may be further coupled. have.

The post may be made of glass and coupled to one side of the damper by a flint.

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

1 is an exploded perspective view of a fluorescent display tube according to a first embodiment of the present invention, FIG. 2 is a plan view of a fluorescent display tube according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line A-A 'of FIG.

As shown in FIG. 1, the fluorescent display tube of the present invention includes a pair of substrates formed of non-conductive materials facing each other, one of which constitutes a front substrate 1 and the other substrate of a rear substrate ( 3) Configure. At least one of the pair of substrates 1 and 3 should be made of a transparent material so that the inside of the fluorescent display tube can be seen through the substrate, and the substrate is usually composed of the front substrate 1.

In addition, a side wall (5) is provided between the front substrate (1) and the rear substrate (3), the vacuum vessel 31 is composed of a combination thereof.

The fluorescent display tube shown in FIG. 1 is a general fluorescent display tube as described above, and the fluorescent display tube is provided on the rear substrate 3 into the vacuum vessel 31 and receives electrons to emit light to display the display pattern portion ( 37 and a plurality of filaments 7 for fixing both ends to the filament support 9 provided on the rear substrate 3 and receiving power from the outside, And a grid electrode 21 which serves to accelerate, diffuse or block hot electrons emitted from the filament 7 toward the anode 19.

Wherein the plurality of filaments (7) is a barium (Br), strontium (Sr) and calcium (Ca) on a thin tungsten core wire of about 20㎛ so that the fluorescent display tube does not interfere with the emission of hot electrons required for self-luminescence display ) Is formed by coating an oxide film, and both ends thereof are fixed to the filament support 9 as described above.

At this time, one end of the filament (7) is fixed to the fixed support (9a) of the filament support (9), the other end is installed on the movable support (9b) of the filament support (9), the filament (7) is provided on the filament support (9) while receiving a proper tension.

In addition, an anode wiring layer 19a for electrically connecting the display pattern portion 37 on the rear substrate 3 and an insulating layer 23 which serves to prevent unnecessary electrical conduction between the anode wiring layer 19a. The anode layer 19b is formed on the insulating layer 23 in accordance with the implementation pattern 37a of the fluorescent display tube.

In addition, a phosphor 29a is coated on the pattern 37a to form a phosphor layer 29, and on the phosphor layer 29, a metal obtained by etching a thin plate, such as stainless steel, into a hexagonal shape. A grid electrode 21 composed of a mesh is provided.

In addition, a damper 13 is installed in the vacuum vessel 31 to be connected to the filament 7 to prevent the filament 7 from shaking due to its amplitude.

The damper 13 is configured by firmly fixing the damper glass 13 a on the front substrate 1 or the rear substrate 3, which is installed on the rear substrate 3 in this embodiment.

At this time, the damper 13 is disposed on the rear substrate 3 so as not to disturb the pattern 37a, that is, disposed on the non-light emitting region of the fluorescent display tube.

In the present embodiment, such a damper 13 is made of a glass 13a for damper (Damper) which is fixed on the rear substrate 3 by the fleet 16, as shown in FIG. In the damper 13, the filament 7 is positioned on the upper surface of the damper glass 13a approximately at the center thereof, and is fixed by the fleet 16 applied to the upper surface thereof, whereby the filament ( 7) may have a structure supported by the damper 13.

The fleet 16 is a non-conductive, non-conductive material having a non-conductive characteristic, which fixes the damper glass 13a to the back substrate 3, respectively, and fixes the filament 7. It is applied to each position so as to be fixed to the upper surface of the glass 13 for the damper, and then firmly hardened by sintering and firmly bonding them.

When the filament 7 is fixed by the damper 13 as described above, the fluorescent display tube is enlarged so that the filament 7 can be prevented from vibrating by increasing its amplitude due to the length of the filament 7. do. That is, since the damper 13 firmly supports the filament 7 at the substantially center position of the filament 7, the amplitude of the filament 7 is increased, thereby preventing vibration and vibration from occurring. .

4 is a cross-sectional view of a fluorescent display tube according to a second embodiment of the present invention.

In FIG. 3, the damper according to the present invention has been described as an example, but as illustrated in FIG. 4, the dampers 13, 13 ′, 13 ″, 13 ″, 13 ″ ″ according to the present invention. ) May be arranged in plurality on the non-light emitting area of the rear substrate (3).

5 is a cross-sectional view of a fluorescent display tube according to a third exemplary embodiment of the present invention.

The fluorescent display tube according to this embodiment has a damper 13 of the above-described example, and is further provided with a post 39 which contacts the front substrate 1 above the damper 13. The post 39 is connected to the damper 13 and has a structure in which one side thereof is connected to the front substrate 1 against one surface of the front substrate 1.

The structure in which the post 39 is connected to the damper 13 is, in the above-described embodiments, that the post (before the damper 13 and the filament 7 is fixed by the fleet 16 is fixed to the post ( The post glass 39a for constituting 39 is attached to the fleet 16 and placed on the upper surface of the damper 13, and the fleet 16 is applied to the upper surface thereof, and then the front surface When the substrate 1 is coupled to the rear substrate 3, the front substrate 1 is attached to the fleet 16 applied to the upper surface of the glass 39a for posts. Of course, the flits 16 harden through the firing process and bind the substrates 1, 3, the dampers 13 and the posts 39 to each other in a solid state.

6, a plurality of posts 39 may be installed between the front substrate 1 and the rear substrate 3 together with the damper 13.

When the fluorescent display tube is formed by coupling the posts 39 to the upper portion of the damper 13 as described above, the fluorescent display tube is prevented from shaking of the filament 7 as described above by the damper 13. Here, the post 39 serves to faithfully support between the front substrate 1 and the rear substrate 2 constituting the vacuum vessel 31 together with the damper 13. The internal pressure of the vacuum vessel 31 can be improved to reinforce its structural strength characteristics.

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 is manufactured as an enlarged display by overcoming a problem that may occur when the size thereof is enlarged, that is, a limitation of design freedom due to deterioration of image quality due to vibration of the filament or a decrease in pressure resistance. Will have the effect.

In order to realize such an increase in size, the advantages of manufacturing separate fluorescent display tubes in one product, that is, the cost of manufacturing can be lowered by simplifying the module set and reducing the number of components (eg, driving chips).

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

2 is a plan view of a fluorescent display tube according to a first embodiment of the present invention.

3 is a cross-sectional view taken along line AA ′ of FIG. 2.

4 is a cross-sectional view of a fluorescent display tube according to a second embodiment of the present invention.

5 is a cross-sectional view of a fluorescent display tube according to a third embodiment of the present invention.

6 is a cross-sectional view of a fluorescent display tube according to a fourth embodiment of the present invention.

Claims (8)

In a fluorescent display tube formed by arranging a plurality of filaments for emitting hot electrons in a vacuum container, the filaments are fixed to both ends of the filament support is fixed on the substrate forming the vacuum container, And at least one damper connected to the filament on the substrate forming the vacuum container. The method of claim 1, The damper, And a non-conductor fixedly installed on the substrate and connected to the filament. The method of claim 2, The filament is a fluorescent display tube, characterized in that the flit applied to the upper surface of the damper is plastically deformed fixedly installed. The method of claim 2, And the non-conductor is made of glass. The method of claim 1, The vacuum container includes a first substrate, a second substrate disposed at an arbitrary distance from the first substrate, and a side wall disposed between the first substrate and the second substrate, The damper is supported and installed on the first substrate, And a post which is supported by the second substrate on one side of the damper to which the filament is fixed and which maintains the cell gap of the vacuum vessel together with the damper. The method of claim 5, wherein And the post is made of glass and coupled to one side of the damper by a flint. The method of claim 1, And the damper is disposed at the center of the filament and connected to the filament. The method of claim 1, And a plurality of dampers disposed on the substrate at random intervals and connected to the filaments.