KR100243252B1 - Fluorescent display device and manufacturing method thereof - Google Patents

Abstract

Disclosed are a fluorescent display device and a method of manufacturing the same. According to the invention, the upper substrate and the lower substrate; Spacers for maintaining gaps between the substrates; A conductive layer formed on an upper surface of the lower substrate and coated with a phosphor; A grid member spaced apart from the conductive layer; A plurality of line cathodes extending parallel to the upper side of the grid; A supporter for supporting the line cathode; In the fluorescent display device having the conductive layer, the grid, and the line cathode lead, each line cathode is provided with a first supporter and a second supporter such that each line cathode is supported by a supporter different from the line cathodes on both adjacent sides. There is provided a fluorescent display device. The fluorescent display device according to the present invention has the advantage that the pitch of the line cathode can be minimized, and thus the luminance can be increased, and the difference in the left and right luminance in the DC voltage driving can be improved and the product length can be increased. .

Description

Fluorescent display device and its manufacturing method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display device and a method for manufacturing the same, and more particularly, to a fluorescent display device and a method for manufacturing the same, in which a luminance difference can be compensated for even when driven by a direct current voltage by separately fabricating and assembling line cathodes. It is about.

In general, a fluorescent fluorescent display (VFD) is constructed by providing a line cathode and an anode in a vacuum container having at least one side transparent, and applying a phosphor on the anode. In the operation of a fluorescent display device, hot electrons emitted from the line cathodes are accelerated to the anode side of the positive potential by direct current or pulse voltage, where the phosphor applied on the anode is subjected to the collision of hot electrons. According to the light emission. In general, a three-pole fluorescent display device further including a grid is widely used, and a predetermined light emitting pattern may be formed by controlling hot electrons.

1 is an exploded perspective view illustrating an example of a typical fluorescent display device 10.

Referring to the drawings, this shows a state in which the upper substrate 12 constituting part of the glass case is separated. As shown in the figure, the fluorescent display device 10 is enclosed by the upper and lower substrates 12 and 13 opposite to each other and the upper and lower substrates 12 and 13 at the edges of the fluorescent display device 10 to maintain the mutual spacing of the substrates. And a spacer 14 for forming a gap.

In the inner space of the upper substrate 12, a plurality of conductive layers 15 serving as anodes and a plurality of line cathodes 16 serving as cathodes are provided. The conductive layers 15 are formed on the lower substrate 13, and the line cathodes 16 are spaced apart from the conductive layer 15 by a predetermined height in parallel with each other. The line cathodes 16 are supported by the cathode support 16a provided on both sides of the lower substrate 13. Phosphor 18 is coated on the upper surface of the conductive layer 15, and a grid 17 is provided between the conductive layer 15 and the line cathode 16. The grid 17 has support portions 17a extending from both sides of the grid body, and the support portions 17a are fixed to the lower substrate 13.

Power supply to the fluorescent display device is made through a plurality of leads 19 provided on the side of the glass case. The lead 19 is formed of a thin metal plate, and as shown in the drawing, a plurality of lead frames are arranged in parallel on one side of the fluorescent display device. Each of the leads 19 is electrically connected to the conductive layer 15, the line cathode 16, and the grid 17.

In the fluorescent display device 10 as described above, when an electric potential is applied to the line cathode 16 and the conductive layer 15, hot electrons are emitted from the line cathode 16, and the hot electrons are accelerated by the grid 17. And collide with the phosphor 18 coated on the upper surface of the conductive layer 15 while being controlled. When the phosphor 18 collided with the hot electrons emits light, the fluorescent display device 10 displays letters, numbers, and the like that can be identified even in a dark place.

The voltage applied to the line cathode 16 of the fluorescent display device may be alternating current (AC) or direct current (DC), particularly when polarity separation occurs between adjacent line cathodes 16 when a direct current voltage is applied. This causes a voltage drop. This voltage drop causes a decrease in luminance. In order to prevent this, conventionally, a method of inclining adjacent line cathodes 16 to each other was used.

2A and 2B illustrate a plan view and a front view of a lead frame installed in a fluorescent display device, which shows a state before the lead frame is assembled to the fluorescent display device.

Referring to the drawings, the lead frame 20 includes a plurality of line cathodes 16 extending in parallel to each other, and a plurality of leads 22 and 23 extending in parallel to a direction perpendicular to the line cathodes 16. It is provided. Both ends of the line cathode 16 are supported by the supporter 16a. The tie bar 21 has a function of supporting the supporters 16a and the leads 22 and 23 before the lead frame 20 is assembled to the fluorescent display tube. The tie bar 21 is cut and removed from the final fluorescent display device. . The leads 22 are each electrically connected to the conductive layer 15 and the grid 17 described with reference to FIG. 1, and the leads 23 are electrically connected to the line cathode 16.

As can be clearly seen in FIG. 2B, when the direct current voltage is applied, adjacent line cathodes 26 are installed to be inclined with each other, thereby preventing a decrease in luminance due to voltage drop. However, there is a limitation in preventing the voltage drop by inclining the line cathode, and furthermore, there is a problem in that the line cathodes do not approach each other within a predetermined pitch. In addition, there is a problem in that a luminance difference occurs between the left side and the right side of the fluorescent display.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a fluorescent display device capable of improving luminance and compensating for a luminance difference.

Another object of the present invention is to provide a fluorescent display device in which the luminance can be improved by reducing the pitch of the line cathode.

Another object of the present invention is to provide a fluorescent display device to which DC voltages having different polarities can be applied by assembling separately manufactured lead frames.

Another object of the present invention is to provide a manufacturing method of a fluorescent display device in which luminance can be improved by separately fabricating lead frames.

1 is an exploded perspective view schematically illustrating a typical fluorescent display device;

2A and 2B are a plan view and a front view of a lead frame for a fluorescent display device according to the prior art;

4A and 4B are plan views of a lead frame for a fluorescent display device according to the present invention;

3A and 3B are front views of each lead frame shown in FIGS. 4A and 4B.

Fig. 5 is a plan view showing the lead frames shown in Figs. 4A and 4B superimposed on one another.

FIG. 6 is a front view of FIG. 5; FIG.

Brief description of the main symbols in the drawings

12.22. Upper substrate 13.23. Bottom substrate

14. Spacer 16. Line cathode

18. Phosphor 19. Lead

20.Lead Frame 21.Tie Bar

22.23. Reid 26. Line Cathode

31.37. Tie Bar 36. 38. Line Cathode

In order to achieve the above object, according to the present invention, the upper substrate and the lower substrate; Spacers for maintaining gaps between the substrates; A conductive layer formed on an upper surface of the lower substrate and coated with a phosphor; A grid member spaced apart from the conductive layer; A plurality of line cathodes extending parallel to the upper side of the grid; A supporter for supporting the line cathode; In the fluorescent display device having the conductive layer, the grid, and the line cathode lead, each line cathode is provided with a first supporter and a second supporter such that each line cathode is supported by a supporter different from the line cathodes on both adjacent sides. There is provided a fluorescent display device.

According to another feature of the invention, each of the line cathodes is applied with a voltage having a polarity different from that of the voltages applied to the adjacent line cathodes on both sides.

According to another feature of the invention, the line cathodes of the first and second lead frames are fixed inclined relative to the first and second supporters.

According to another feature of the present invention, the leads connected to the first supporter and the leads connected to the second supporter extend in opposite directions.

According to the present invention, there is also provided a plurality of line cathodes, a first supporter for supporting the line cathodes, a plurality of leads extending in a direction perpendicular to the line cathodes, and a tie bar for supporting the supporters and leads. A second lead frame having a lead frame, a plurality of line cathodes, a second supporter supporting the line cathodes, a lead extending from the second supporter, and a tie bar supporting the supporter and the lead And arranging the first lead frame and the second lead frame so that the line cathode of the second lead frame is disposed between the line cathodes of the first lead frame, and fixing the first lead frame and the second lead frame to a predetermined portion of the fluorescent display device. And removing the tie bars of the first lead frame and the second lead frame. The method of manufacturing a vacuum fluorescent display apparatus is provided for.

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

The fluorescent display device according to the present invention has a configuration similar to that of the general fluorescent display device described with reference to FIG. 1. That is, as described with reference to FIG. 1, the upper substrate 12 and the lower substrate 13, the spacers 14 separating the upper and lower substrates 12 and 13 from each other, and a conductive layer provided therein ( 15) and a fluorescent layer 18. In addition, the line cathodes 16 extending in parallel are spaced apart from the conductive layer 15 at predetermined intervals, and a grid 17 is provided between the line cathodes 16 and the conductive layer 15. A plurality of leads 19 are arranged in parallel on the side of the fluorescent display device, one end of which is inserted into a glass case consisting of a substrate and a spacer and fixed by frits.

3A and 3B are plan views of a lead frame included in the fluorescent display device according to the present invention, which shows a state before being assembled to the fluorescent display device.

Referring to the drawings, the lead frame assembled in the present invention includes a first lead frame 30a shown in FIG. 3A and a second lead frame 30b shown in FIG. 3B.

The first lead frame 30a includes a plurality of line cathodes 36 extending in parallel to each other and a plurality of leads 32 and 33 extending in parallel to a direction perpendicular to the length of the line cathodes 36. Equipped. Both ends of the line cathode 36 are supported by the first supporter 36a. The tie bar 31 has a function of supporting the first supporter 36a and the lead 32 and is cut after assembly is completed. As described above, the lead 32 is electrically connected to the conductive layer and the grid, and the lead 33 is electrically connected to the line cathode.

The second lead frame 30b has a plurality of line cathodes 38 extending in parallel with each other. Both ends of the line cathode 38 are supported by the second supporter 38a. A lead 39 extends to the second supporter 38a, which is electrically connected to the line cathode 38. The tie bar 37 has a function of supporting the second supporter 38a and is cut after the final assembly is completed.

4A and 4B show front views of the first lead frame 30a and the second lead frame 30b shown in FIGS. 3A and 3B, respectively.

Referring to the drawings, the first supporter 36a of the first lead frame 30a is formed to be lower than that formed on the left side. On the contrary, the second supporter 38a of the second lead frame 30b is formed lower on the left side than on the right side.

In the embodiment shown in the drawings, the line cathodes are inclined to the supporter, but the line cathodes 36 of the first lead frame 30a and the line cathodes 38 of the second lead frame 30b are inclined. Or it may not. This will be explained in more detail later.

5 and 6 illustrate a state where the first lead frame 30a and the second lead frame 30b are superimposed on each other to be assembled to the fluorescent display device.

Referring to the drawings, by overlapping the first and second lead frames 30a and 30b, the line cathodes 36 and 38 are alternately arranged. That is, the line cathode 38 of the second lead frame 30b is disposed on both sides adjacent to the line cathode 36 of the first lead frame 30a, and the line cathode of the second lead frame 30b is disposed. Line cathodes 36 of the first lead frame 30a are disposed on both sides adjacent to 38. Since the tie bars 31 and 37 are removed after the lead frame is completely assembled, the first and second supporters 36a and 38a supporting the respective line cathodes 36 and 38 in the completed fluorescent display are It is installed differently from the supporter which supports the adjacent line cathode. Of course, since the tie bars 31 and 37 are removed, a short circuit does not occur when a voltage is applied through the leads 33 and 39 connected to the respective supporters. The leads 33 connected to the line cathode 36 face upwards, while the leads 39 connected to the other line cathode 38 face downwards. However, it will be apparent that the direction of these leads can be changed by simple design changes.

In the operation of the fluorescent display device, line voltages 36 and 38 are applied with DC voltages having different polarities. That is, when a positive voltage is applied to the line cathode 36 of the first lead frame 30a, a negative voltage is applied to the other line cathode 38 of the second lead frame 30b. As such, different voltages may be applied to prevent a voltage drop due to interaction between adjacent line cathodes, thereby preventing a decrease in luminance.

In FIG. 6, the line cathodes 36 and 38 are arranged to be inclined to each other, but may be installed not to be inclined. In the case where the line cathodes are installed inclined, the length of the line cathode is increased so that a lot of hot electrons are emitted to increase luminance. However, even if the line cathodes are not inclined, the luminance decrease due to the voltage drop will not occur because voltages having different polarities are applied to the line cathodes which are alternately installed. Therefore, the product size of the DC drive can be increased. In addition, although the line cathodes 36 and 38 each have inclinations in different directions in FIG. 6, they may be provided so as to have inclinations in the same direction.

Since the fluorescent display device according to the present invention can apply voltages of different polarities between adjacent line cathodes, the pitch of the line cathode can be minimized, and thus the luminance can be increased. In addition, when the line cathodes are disposed to be inclined with each other, the emission amount of hot electrons may be increased, and the luminance may be further increased. In the operation of the DC voltage, the luminance difference between the left and right sides may be improved, and the product length may be enlarged. Moreover, it is possible to easily manufacture by using a separately produced lead frame.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. will be. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (6)

An upper substrate and a lower substrate; Spacers for maintaining gaps between the substrates; A conductive layer formed on an upper surface of the lower substrate and coated with a phosphor; A grid member spaced apart from the conductive layer; A plurality of line cathodes extending parallel to the upper side of the grid; A supporter for supporting the line cathode; A fluorescent display device comprising a lead for conducting the conductive layer, the grid, and the line cathode, And each of the line cathodes is provided with a first supporter and a second supporter so as to be supported by supporters different from the line cathodes on both adjacent sides. The fluorescent display device of claim 1, wherein a voltage having a polarity different from that of the voltages applied to the adjacent line cathodes is applied to each of the line cathodes. The fluorescent display device of claim 1, wherein the line cathodes of the first and second lead frames are fixed to be inclined with respect to the first and second supporters. The fluorescent display device of claim 1, wherein the leads connected to the first supporter and the leads connected to the second supporter extend in opposite directions. Providing a first lead frame having a plurality of line cathodes, a first supporter for supporting the line cathodes, a plurality of leads extending in a direction perpendicular to the line cathodes, and tie bars for supporting the supporters and the leads; step, Providing a second lead frame having a plurality of line cathodes, a second supporter supporting the line cathodes, a lead extending from the second supporter, and a tie bar supporting the supporters and the leads; Overlapping the first lead frame and the second lead frame so as to be disposed between the line cathodes of the first lead frame, and fixing the first lead frame and the second lead frame to a predetermined portion of the fluorescent display device; And removing the tie bars of the first lead frame and the second lead frame. The method of manufacturing a fluorescent display device according to claim 5, wherein the line cathodes of the first and second lead frames are fixed to be inclined with respect to the first and second supporters.

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