KR100484095B1 - Vacuum fluorescent display - Google Patents

Abstract

The fluorescent display tube of the present invention includes a substrate, an electrode formed in a predetermined pattern on an upper surface of the substrate, an insulating layer which insulates each electrode from each other, a conductive layer and a phosphor layer respectively laminated on an upper surface of the electrode, and the phosphor layer. A line cathode disposed at an upper portion, a grid provided between the phosphor layer and the line cathode, a support member for supporting the line cathode at both ends, and applying electricity, and a space portion located at a periphery of the substrate. A fluorescent display tube having a spacer provided, a transparent glass plate seated on an upper surface of the spacer, and a plurality of leads connected to the electrodes and extending outwardly of the space, respectively, for applying electricity to the support member and the support member. A resistance is provided between the leads, and such a fluorescent tube is used to reduce the voltage applied to the line cathode. By using a resistor in the circuit without using a separate voltage drop device, there is an effect that the configuration is simpler, easier to install, and less expensive to manufacture.

Description

Fluorescent Display Tube {Vacuum Fluorescent Display}

The present invention relates to a fluorescent display tube with a built-in resistor.

A fluorescent display tube (VFD) is a direct-type three-pole vacuum tube belonging to a flat display having irradiated hot electrons to a phosphor having low-speed electron beam excitation light emission characteristics and having a display function such as a letter symbol figure. The fluorescent display tube has a high display randomness and visual recognition, and a low operating voltage enables direct driving by a MOS IC. In addition, since the operating temperature ranges from -40 ℃ to + 85 ℃, and has a long-lasting life of more than 10,000 hours, it has high reliability characteristics, such as home appliances such as VTRs and audio equipments, dashboards of automobiles, point of sales It is used in a wide range of fields, such as operation panels of terminals and copiers.

In addition to the monochromatic display using the conventional cyan-emitting phosphor, the display color of the image has a light emission color such as blue yellow orange red, and various colors can be expressed by the development of a low-speed electron beam emission phosphor. There is this. Such a shape display tube is a kind of triode which encloses a cathode grid anode in a high vacuum glass container, and is a high brightness display device among various flat displays. This is a very high display element.

1 and 2 schematically illustrate an exploded perspective view and a sectional view of an example of a conventional fluorescent display tube.

As shown in the drawing, a conventional fluorescent display tube is provided with a spacer 12 having a constant height at an edge portion of an upper surface of the substrate 14, and the transparent glass plate 10 is seated and sealed on the upper surface of the spacer 12. Isolate the inside from the outside. In the inner space portion, support members 22 are provided at both ends in the longitudinal direction, and each support member 22 supports a plurality of line cathodes 18 in parallel. Meanwhile, a grid 20 having a network structure is positioned below the plurality of line cathodes 18, and a fluorescent pattern is positioned below the grid 20. The grid 20 functions to control the movement of hot electrons emitted from the line cathode 18. In addition, a plurality of leads 16 extend from the inner space to the outside to supply electricity to the support member 22 and the fluorescent pattern. When electricity of a constant voltage is supplied to the lead 16 from the power source, the electricity is supplied to the grid 20 and the electrode 24 and the support member through the lead 16 and respective circuits formed on the substrate 14. 22).

An electrode 24 having a predetermined pattern is formed on the upper surface of the substrate 14, and an insulating layer 26 is provided to insulate the electrodes from each other. In the upper portion of the electrode 24, a conductive layer 28 electrically connected to the electrode 24 is formed through the hole 32 formed by the insulating layer 26. The phosphor layer 30 is coated on the upper surface. And the grid 20 is installed above the phosphor layer 30 spaced a predetermined distance.

The operation of the conventional fluorescent display tube made as described above is as follows.

When electricity is applied to the plurality of leads 16, electricity is supplied to the support member 22 on one side and a circuit is formed through the line cathode 18 and the other support member 22. As electricity passes through the line cathode 18, the line cathode 18 is heated and emits hot electrons. At the same time, electricity is also supplied to the grid 20, and electricity is also supplied to the electrode 24 formed in a predetermined pattern on the upper surface of the substrate 14. The electrode 24 is supplied with electricity to serve as an anode corresponding to the line cathode 18. In addition, since the phosphor coated on the uppermost layer of the electrode has physical properties that are excited and emit light by colliding with hot electrons, the light emits by collision with hot electrons emitted from the line cathode 18.

Meanwhile, the hot electrons emitted from the line cathode 18 are decelerated and accelerated by controlling their speed according to the voltage applied to the grid 20. Therefore, the brightness of the image can be adjusted by controlling the voltage of electricity applied to the grid 20 as needed for image expression.

However, the conventional fluorescent display tube made as described above has a disadvantage in that the external input voltage must be determined according to the capacity of the line cathode 18 installed therein. That is, in order to apply electricity having a voltage corresponding to the capacity of the line cathode 18 installed in a space which is isolated from the outside and sealed in a vacuum state, a process of dropping electricity applied from the outside through a separate voltage drop device is performed. After roughening, since the dropped voltage must be applied to the fluorescent display tube, there is a disadvantage in that a separate voltage drop device is required to obtain a voltage corresponding to the rated voltage of the line cathode 18.

The present invention has been made to solve the above problems, and an object thereof is to provide a fluorescent display tube having a simple structure that includes a voltage drop means in itself and does not require a separate voltage drop device.

 The present invention, in order to achieve the above object; An insulating layer which insulates each electrode from each other formed in a predetermined pattern on an upper surface of the substrate; A conductive layer and a phosphor layer respectively laminated on the upper surface of the electrode; A plurality of line cathodes arranged on top of the phosphor layer; A grid provided between the phosphor layer and the line cathode; A support member supporting the line cathode at both ends and applying electricity to the line cathode; A transparent glass plate positioned on a periphery of the substrate to provide a space, and a transparent glass plate seated on an upper surface of the spacer to provide a closed space; And a plurality of leads connected to the electrodes and extending outwardly of the space, respectively, wherein the resistor has a resistance between the support member and a lead for applying electricity to the support member.

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

3 is an exploded perspective view schematically illustrating the fluorescent display tube according to the first embodiment of the present invention, and FIG. 4 is a plan view of FIG. 3.

The same reference numerals as FIGS. 1 and 2 indicate the same members having the same function.

Referring to the drawings, the fluorescent display panel according to the present embodiment includes a substrate 14 having a generally rectangular shape, a plurality of electrodes (not shown) formed in a pattern of an image displayed on the upper surface of the substrate 14, and each electrode. The insulating layer 26 which mutually insulates, and the conductive layer 28 and the fluorescent substance layer 30 are apply | coated on the upper surface of the said electrode. In addition, a plurality of line cathodes 18 are provided on the phosphor layer 30, and a mesh grid 20 is provided between the phosphor layer 30 and the line cathode 18. It is preferable that the rated voltage of the line cathode 18 is generally used to have a capacity of 2 to 4 volts. In addition, the line cathode 18 is supported at both ends of the substrate 14 so as to be in a tensioned state, and the support members 22 at both ends for applying electricity to the line cathode 18 and the edge of the substrate 14. A spacer 12 having a predetermined height to provide a space therein, a transparent glass plate 10 seated on an upper surface of the spacer 12 to provide a sealed space, and connected to the plurality of electrodes, respectively, and an internal space. A predetermined capacity of resistance 100 is provided between the plurality of leads 16 extending from the outside to the support member 22 and the leads 16 for applying electricity to the support member 22. The resistor 100 is located outside the fluorescent display tube, and serves to drop electricity applied to the line cathode 18 to 2 to 3 volts, which is the rated voltage of the line cathode 18. Use cement resistance. In addition, since the resistor 100 is installed outside of the fluorescent display tube, the resistors of various capacities may be applied since the resistors may be exchanged according to the characteristics of the external electric voltage. That is, since the resistor 100 is detachably attached to the fluorescent display tube, it can cope with an electric input environment from the outside.

5 is a view showing a second embodiment of a fluorescent display tube according to the present invention.

3 and 4, the same reference numerals indicate the same members having the same function.

Referring to the drawings, the fluorescent display tube according to the second embodiment is similar to the first embodiment, but in this embodiment, the resistor 100 is provided inside the fluorescent display tube. Therefore, it can be applied where it is fixed at a specific place and used permanently, and has a simpler shape.

The fluorescent display tube according to the first embodiment of the present invention made in this way is particularly applicable to automobiles. Electricity used to drive various auxiliary devices of a vehicle is usually 12 volts DC, and the 12 volts DC is dropped to a predetermined voltage through the resistor 100 and applied to the line cathode 18 by a predetermined image. Can be obtained.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. Do.

The fluorescent display tube of the present invention thus formed uses a resistor on its own, rather than using a separate voltage drop device for the voltage drop applied to the line cathode, so that the structure of the fluorescent display tube is simpler and easier to install. It has the effect of low production cost.

1 is an exploded perspective view of a conventional fluorescent display tube.

2 is a cross-sectional view schematically showing a conventional fluorescent display tube.

Figure 3 is an exploded perspective view schematically showing a fluorescent display tube according to a first embodiment of the present invention.

4 is a plan view schematically showing a fluorescent display tube according to the first embodiment of the present invention;

5 is a plan view schematically showing a fluorescent display tube according to a second embodiment of the present invention;

<Description of the symbols for the main parts of the drawings>

10: transparent glass plate 12: spacer

14: Substrate 16: Lead

18: line cathode 20: grid

22: support member 24: electrode

26: insulating layer 28: conductive layer

30: phosphor layer 32: hole

100: resistance

Claims (2)

A substrate; An insulating layer which insulates each electrode from each other formed in a predetermined pattern on an upper surface of the substrate; A conductive layer and a phosphor layer respectively laminated on the upper surface of the electrode; A line cathode provided on the phosphor layer; A grid provided between the phosphor layer and the line cathode; A support member supporting the line cathode at both ends and applying electricity to the line cathode; A transparent glass plate positioned on a periphery of the substrate to provide a space, and a transparent glass plate seated on an upper surface of the spacer to provide a closed space; And a plurality of leads each connected to the plurality of electrodes and extending out of the space portion. A resistance provided between the support member and a lead for applying electricity to the support member to lower the electricity applied to the line cathode to a rated voltage of the line cathode, wherein the resistance is installed outside the sealed space, Fluorescent display tube, characterized in that the removable installation with respect to the fluorescent display tube so that it can be replaced according to the characteristics of the external electrical voltage. 2. The fluorescent display tube according to claim 1, wherein the resistance is cement resistance.

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