JPH03219530A - Cathode for discharge display device and discharge display device - Google Patents

Abstract

PURPOSE:To allow an extended life, a higher brightness, a higher emission efficiency, a higher resolution and a lower price by using a space surrounded by metal wall parts and a metal mesh part for connecting a plurality of metal wall parts to each other as a negative glow generating space. CONSTITUTION:The cathode K is an electrode formed of metal wall parts W arranged in parallel to each other at fixed intervals and metal mesh parts M for connecting the wall parts W to each other. A plurality of spaces surrounded by the wall parts W and the mesh parts M are used as negative glow generating spaces, and the size of the wall part W is determined according to a required resolution. This cathode K can be obtained by etching both the surfaces of one metal plate. Such a negative glow generating space facilitates hollow effect and allows an extended life, a higher brightness, a higher emission efficiency, a higher resolution and a lower price.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode for a discharge display device and a discharge display device.

[Conventional technology]

Plasma display panels (FDP) used as gas discharge display devices include AC (alternating current) type and DC (direct current) type. In AC type FDP, the electrodes are covered with an insulating layer, so the electrodes are not subjected to direct ion bombardment.
Although it has the advantage that the electrode has a long life, it has disadvantages such as being complicated to manufacture, difficult to drive, and therefore expensive.

On the other hand, DC type FDPs have the advantage of being simple to manufacture, easy to drive, and therefore inexpensive, but on the other hand, because the electrodes are not covered with an insulating layer,
The drawback is that the electrodes are subject to direct ion bombardment and have a short lifespan.

Next, a conventional example of a DC type FDP will be explained with reference to FIG. The DC-type PDP shown in Fig. 14 is a high-resolution one in which electrodes are formed using thick film printing technology, and a plurality of striped cathodes K are arranged parallel to each other at predetermined intervals on a rear glass plate (1). At the same time as being deposited and formed, the cathodes are spaced apart from each other at a predetermined distance and are orthogonal to each other.
A plurality of band-shaped anodes A are arranged parallel to each other at predetermined intervals, and bar-shaped partition walls made of an insulating material are arranged in the gaps between the plurality of anodes A. Incidentally, these anodes A and partition walls BR are formed on a front glass plate (not shown).

Next, referring to FIG. 15, another conventional example of a DC type PDP will be described. The DC type PDP shown in Fig. 15 uses a striped metal plate as the cathode and a metal wire as the anode A, and a display cell hole H is bored in the part of the cathode that intersects with the anode A. has been done. Further, the plurality of anodes A are arranged in grooves formed in the rear glass plate (1), and the portion between the grooves of the rear glass plate (1) is the partition wall of the DC type FDP shown in FIG. Compatible with BR.

[Problem to be solved by the invention]

In the above-described DC type PDP shown in FIG. 14, since the electrodes K are formed by thick film printing technology, the life span is considerably shortened due to ion sputtering due to direct ion bombardment, impurity gas release from the cathode K, and the like.

On the other hand, in the DC type PDP shown in Fig. 15, the cathode K is made of a metal plate and the anode A is made of a metal wire, so the lifespan is considerably longer than that of the DC type FDP shown in Fig. 14. The size of the display cell hole H on the cathode,
Due to the respective limitations on the width and spacing of the cathodes, it is almost impossible to obtain a high resolution DC type FDP.

In view of this, the first aspect of the present invention is to propose a cathode for a discharge display device that enables a discharge display device to have a longer life, higher brightness, higher luminous efficiency, higher resolution, and lower cost. be.

A second aspect of the present invention is to propose a discharge display device that has a long life, high brightness, high luminous efficiency, high resolution, and is inexpensive.

The third aspect of the present invention is to propose a discharge display device that has a long life, high brightness, high luminous efficiency, and is inexpensive.

[Means to solve the problem]

A first aspect of the present invention provides a plurality of metal wall portions W arranged parallel to each other at predetermined intervals, and a plurality of metal wall portions W arranged parallel to each other at predetermined intervals.
This is a cathode for a discharge display device, in which a plurality of spaces surrounded by a plurality of metal wall parts W and a plurality of metal mesh parts M are used as spaces for generating negative glow.

A second aspect of the present invention provides a plurality of metal wall portions W arranged parallel to each other at predetermined intervals, and a plurality of metal wall portions W
The display cathode consists of a metal mesh part M that connects a plurality of metal wall parts W and a plurality of spaces surrounded by the metal mesh part M as negative glow generation spaces, and a plurality of negative glow generation spaces. A plurality of anodes A are arranged to face the spaces, and a plurality of scanning cathodes (3) are arranged to cross the plurality of negative glow generation spaces on the opposite side of the plurality of negative glow generation spaces. This is a discharge display device having a

A third aspect of the present invention provides a plurality of metal wall portions W arranged parallel to each other at predetermined intervals, and a plurality of metal wall portions W thereof.
The cathode consists of a metal mesh part M that connects the metal mesh parts M, and a plurality of spaces surrounded by the plurality of metal walls W and the metal mesh part M are used as negative glow generation spaces, and a plurality of negative glow generation spaces. Multiple anodes A arranged to face each other
and a plurality of optical shutters (4) disposed on the opposite side of the plurality of negative glow generation spaces so as to intersect with the plurality of negative glow generation spaces.

[Effect]

According to the first cathode K for a discharge display device of the present invention, a plurality of metal wall portions W are arranged parallel to each other at predetermined intervals, and a metal mesh portion M that connects the plurality of metal wall portions W. Since a plurality of spaces surrounded by a plurality of metal wall parts W and a metal mesh part M are used as spaces for generating negative glow, when this cathode K is applied to a discharge display device, a hollow effect is produced. Moreover, when this cathode K is used as a display cathode and a scanning cathode (3) is provided separately, problems with sputtering and impurity gas are eliminated, so it is possible to extend the life of the discharge display device, and it is possible to use the display cathode Compared to a striped cathode, the cathode tends to have a hollow effect and has a larger surface area, making it possible to achieve high luminous efficiency and brightness.The scanning cathode can be made with high definition using thick film printing technology, so it is possible to discharge It becomes possible to increase the resolution of the display device.

According to the second aspect of the present invention, the discharge display device includes a plurality of metal wall portions W arranged parallel to each other at predetermined intervals, and a metal mesh portion M connecting the plurality of metal wall portions W, A display cathode including a plurality of spaces surrounded by a plurality of metal wall parts W and a metal mesh part M are used as negative glow generation spaces, and a plurality of display cathodes arranged so as to face the plurality of negative glow generation spaces. Since it has an anode A and a plurality of scanning cathodes (3) disposed on the opposite side of the plurality of negative glow generation spaces so as to intersect with the plurality of negative glow generation spaces, the display cathode K has a hollow effect. In addition, the display cathode K eliminates the problems of sputtering and impurity gas, making it possible to have a longer life.Compared to a striped cathode, the surface area is larger, resulting in high brightness and high light emission. This improves efficiency and allows the scanning cathode to be made with high definition, making it possible to achieve high resolution.

According to the third aspect of the present invention, the discharge display device includes a plurality of metal wall portions W arranged parallel to each other at predetermined intervals and a metal mesh portion M connecting the plurality of metal wall portions W, A cathode having a plurality of spaces surrounded by a plurality of metal wall parts W and a metal mesh part M serving as spaces for generating negative glow, and a plurality of anodes A arranged so as to face the plurality of spaces for generating negative glow. and a plurality of optical shutters (4) arranged so as to intersect with the plurality of negative glow generation spaces on the opposite side of the plurality of negative glow generation spaces.
Compared to a striped cathode, the cathode easily produces a hollow effect and has a larger surface area, resulting in higher luminous efficiency and luminance.

〔Example〕

The structure of an embodiment of a cathode according to the present invention will be described below with reference to FIGS. 1 to 3.

Figure 1 is a perspective view of a portion of this cathode, Figure 2 is a plan view of a portion of this cathode, and Figure 3 is a sectional view of a portion of the cathode in Figure 2 along the line ■-■. be.

This cathode is a sheet-like electrode consisting of a plurality of metal wall parts W arranged parallel to each other at predetermined intervals and a metal mesh part M connecting the plurality of metal wall parts W. A plurality of spaces surrounded by a wall part W and a metal mesh part M are used as spaces for generating negative glow, and the materials thereof include Ni, stainless steel, Aβ, 4
26 alloy etc. are possible.

Here, the thickness d (constant) of the wall W is smaller than the gap length D (constant) between the walls W, and the height h (constant) above the mesh part M of the wall W The thickness is selected to be larger than the thickness d. Note that h' (constant) in FIG. 1 indicates the thickness of the mesh portion M.

These dimensions d, D, h of the cathode are set according to the required resolution of the discharge display device in which this cathode K is used. -As an example, the number of pixels is 640X4
When this cathode K is applied to a DC type PDP for a personal computer with 0.00 dots and a pixel pitch of 0.33 mm, the above-mentioned dimensions d, D, and h are each d=0.1 m.
m, D=0.23mm.

h=0.2 mm, and the dimension h' is less than 1/2 of h.

Such a cathode can be easily obtained by etching both sides of a single metal plate, but the mesh part M
The wall portion W and the wall portion W may be manufactured separately and then welded together.

Next, the configuration of an embodiment of the discharge display device (XY matrix type DC type PDP) according to the present invention will be described with reference to FIGS. 4 to 7. FIG. 4 is an exploded perspective view of a part of such a discharge display device, FIG. 5 is a sectional view thereof, FIGS. 6 and 7 are sectional views for explaining the operating state, and FIG.
It is the same cross-sectional view as the figure, and the cross-section of Figure 7 is 90 degrees different from that of Figure 5.
FIG.

This discharge display device includes a plurality of metal walls W disposed parallel to each other at predetermined intervals, and a metal connecting the plurality of metal walls W, as described in detail with reference to FIGS. 1 to 3. A display cathode K is made up of a mesh part M, and a plurality of spaces surrounded by a plurality of metal walls W and a metal mesh part M are used as spaces for generating negative glow. (2a) on the front glass plate (2).

In addition, a plurality of striped transparent anodes (upper electrodes) A arranged so as to face the plurality of spaces for generating negative glow,
In each gap between the plurality of spacers (2a) described above, the spacers (2a) are deposited on the front glass plate (2) with a constant width and a constant interval by thick film printing.

Further, on the opposite side of the plurality of negative glow generation spaces, a plurality of striped scanning cathodes (lower electrodes) (3) arranged so as to intersect or perpendicularly cross the plurality of negative glow generation spaces (3) are arranged on the back side. They are deposited on a glass plate (1) using a thick film printing technique in a fixed width and at fixed intervals.

Further, insulating stripe-shaped spacers (1a) are formed by thick film printing in each gap between the plurality of scanning cathodes (3) with a constant width and at constant intervals.

An example of voltage-current characteristics between the anode A and the cathode of the discharge display device according to FIG. 8 is shown. In this example, the power supply voltage is 180■ and the discharge start voltage is 160■.

Next, the operation of this discharge display device will be explained.

The same potential as the ON potential (OV) of the scanning cathode (3) is always applied to the display cathode K.

An ON potential is sequentially applied to the scanning cathode (3). The OFF potential of this cathode (3) is 100■.

As shown in FIG. 6, the anode A is ON, that is, a potential of 180 cm is applied to the anode A, and the cathode (3) is ON.
At this point, a negative glow is generated in a glow generation space surrounded by the wall portion W facing the cathode, the mesh portion M, and the anode A. Naturally, even if the cathode (3) is ON, no negative glow will occur in the space where the anode A is OFF.

Such negative glow is prevented from expanding in the longitudinal direction of the cathode (3) by the spacer (2a). Next, although the discharge space in the cathode extends parallel to the longitudinal direction of the anode A, the negative glow is prevented from expanding beyond the width of the cathode (3) in the longitudinal direction of the anode A. The reason for this will be explained with reference to FIG.

Now, as mentioned above, since the cathode K is always given the cathode potential, that is, the potential Ov, the anode A
If it turns on, there is a possibility that a discharge will occur between the anode A and the cathode.

However, as is clear from FIG. 7, before the discharge occurs, that is, in a state where there is no space charge, the electric lines of force from the anode A to the cathode K, when the cathode (3) is ON, are (3) Due to the influence of the potential, the density of the electric lines of force increases, and the anode A
Since the electric field between the anode A and the cathode is strengthened, a negative glow occurs, but where the cathode (3) is OFF, electric lines of force are generated from the cathode (3) to the cathode K, so that the 3 4 anode A and the cathode The density of the electric lines of force between the anode A and the cathode becomes low, and the electric field between the anode A and the cathode is weakened, so that no negative glow occurs. In this case, the cathode (
By setting the ON potential of 3) slightly lower than the ON potential of the cathode, it is possible to more reliably control whether negative glow occurs.

In such a discharge display device, the scanning cathode (3) has a function of determining the generation position of negative glow in cooperation with the anode A, and the ones that emit secondary electrons and contribute to the generation of negative glow are: It is mainly used as a display cathode.

When both the anode A and the cathode (3) are ON, interference between the negative glows occurs in the discharge space surrounded by both walls W and the mesh part M of the cathode, that is, a hollow effect occurs. More secondary electrons are generated at the cathode than at the cathode (3). Therefore, the ion bombardment on the cathode (3) is greatly reduced, so
Even if the cathode (3) is formed by thick film printing, the life of the discharge display device will not be shortened.

Also, the hollow effect occurs when the cathode and the opposite end of the negative glow touch each other, so as shown in Figure 9,
When the cathode K consists only of walls, the optimum range defined between the opposing distance between the walls and the gas pressure is generally narrow, but in the case of a cathode consisting of the walls W and the mesh section M, As shown in FIG. 9A, the effect of the mesh part M and the cathode (3) is similar to that of placing both walls close together, so the optimum range is greatly expanded and the hollow effect becomes large. .

The cathode may be a metal plate with many holes as shown in Figure 13A, a metal grid as shown in Figure 13B, or a metal plate as shown in Figure 13C. It is conceivable that a large number of slits are formed in the slit. However, the ones in Fig. 13A and B have an anode A, a cathode (3
), and since the discharge cells are independent, no priming effect can be expected. Also, the first
The one shown in FIG. 3C does not have the drawbacks of those shown in FIGS. 13A and 13B, but the structural strength of the cathode is low, making it unsuitable for high-definition or large-sized discharge display devices. In addition, those in FIGS. 13A, B, and C include a plurality of metal wall portions W arranged parallel to each other at predetermined intervals as described above, and a metal mesh portion connecting the plurality of metal wall portions W. The hollow effect is less likely to occur as compared to the cathode K in which a plurality of spaces surrounded by a plurality of metal walls W and a metal mesh part M are used as spaces for generating negative glow.

According to such a discharge display device, the plurality of metal walls W includes a plurality of metal walls W arranged parallel to each other at predetermined intervals and a metal mesh portion M connecting the plurality of metal walls W. Since the display cathode, in which a plurality of spaces surrounded by the part W and the metal mesh part M are used as negative glow generation spaces, and the scanning cathode (3) are provided, the following effects can be obtained. The cathode (3) is hardly affected by cathode sputtering and impurity gas release, and the cathode is resistant to cathode sputtering and impurity gas release, so the life of the discharge display device is extended. Since the cathode easily produces a hollow effect and has a larger surface area than a striped cathode, the luminous efficiency and luminance of the discharge display device are both high. The cathode has high structural strength and can be easily aligned with the anode A and cathode (3).

Since the cathode (3) can be made highly fine by thick film printing, the resolution of the discharge display device can be increased.

Next, another embodiment of the discharge display device (XY matrix type FDP) according to the present invention will be described with reference to FIGS. 10 and 12. FIG. 10 is a perspective view of a portion of the discharge display device, FIG. 11 is a sectional view of the portion, and FIG. 12 is a linear plan view thereof. This discharge display device includes a plurality of metal walls W disposed parallel to each other at predetermined intervals, and a metal connecting the plurality of metal walls W, as described in detail with reference to FIGS. 1 to 3. A cathode K is made up of a mesh part M, and a plurality of spaces surrounded by a plurality of metal walls W and the metal mesh part M are used as spaces for generating negative glow, and the lower ends of the mesh M and the wall part W are made of a front glass. It is applied onto the front glass plate (2) 7 8 so as to be on the plate (2) side.

A plurality of striped anodes A, which are arranged facing a plurality of spaces for generating negative glow, are printed on a rear glass plate (1) with a certain width and a certain interval by thick film printing.
and on the back glass (1),
A plurality of striped spacers (2a) are formed in the middle of the plurality of anodes A by thick film printing with a constant width and a constant interval. Then, the upper end portion of the wall portion W of the cathode described above is brought into contact with the plurality of spacers (2a).

Then, as shown in FIG. 12, on the side of the cathode, a plurality of striped liquid crystal shutters (polarizing shutters, etc. (4) is also provided.

The plurality of anodes A are given an ON potential of 200 V by sequentially setting the switches 5W-A to ○N. Note that when the switch 5W-A is OFF, although not shown,
It is assumed that each anode A is given a potential of 100 cm. Further, the ground potential is always applied to the cathode K.

Furthermore, the liquid crystal shutter (4) is equipped with a switch 5W-4 that turns on or off depending on the video signal to be displayed.
Transparency and opacity are controlled by applying a predetermined voltage.

According to this discharge display device, the plurality of metal walls W includes a plurality of metal walls W arranged parallel to each other at predetermined intervals and a metal mesh portion M connecting the plurality of metal walls W. Since the display cathode K is provided in which a plurality of spaces surrounded by the part W and the metal mesh part M are spaces for generating negative glow, the following effects can be obtained. Since the cathode is resistant to sputtering and impurity gas release, the life of the discharge display device is extended. Since the cathode easily produces a hollow effect and has a larger surface area than a striped cathode, the luminous efficiency and luminance of the discharge display device are both high. The cathode has high structural strength and can be easily aligned with the anode A.

9 0 [Effects of the Invention] According to the first invention described above, it is possible to extend the life of the discharge display device, increase the brightness, increase the luminous efficiency, increase the resolution, and reduce the cost. It is possible to obtain a cathode that is high in height and can be easily aligned with other electrodes in a discharge display device.

Furthermore, according to the second aspect of the present invention, a discharge display device that has a long life, high brightness, high luminous efficiency, high resolution, and is inexpensive can be obtained.

Further, according to the third aspect of the present invention, a discharge display device having a long life, high brightness, high luminous efficiency, and low cost can be obtained.

[Brief explanation of drawings]

1, 2 and 3 are a perspective view, a top view and a sectional view, respectively, showing a part of an embodiment of a cathode according to the present invention, and FIG.
5 and 5 are an enlarged perspective view and a sectional view, respectively, showing a part of an embodiment of the discharge display device according to the present invention, and FIGS. 6 and 7.
8 is a characteristic curve diagram showing the voltage-current characteristics of the discharge display device. FIG. 9 is an explanatory diagram showing the discharge state of the display cathode.
1 and 12 are a perspective view, a sectional view, and a plan view, respectively, of a part of another embodiment of the discharge display device according to the present invention, and FIG. 13 is a plan view showing a part of a reference example of the cathode, and FIG. This figure is a perspective view showing a part of a conventional example of a discharge display device, and FIG. 15 is a perspective view showing a part of another conventional example of a discharge display device. K is the display cathode, W, M are the wall and mesh parts of the display cathode, A is the anode, (1) is the back glass plate, (2) is the front glass slope, (1a) and (2a) are (3) is a scanning cathode.

Claims (1)

[Scope of Claims] 1. Consisting of a plurality of metal walls arranged parallel to each other at predetermined intervals and a metal mesh part connecting the plurality of metal walls, the plurality of metal walls and A cathode for a discharge display device, characterized in that a plurality of spaces surrounded by the metal mesh portion are spaces for generating negative glow. 2. Consists of a plurality of metal walls arranged parallel to each other at predetermined intervals and a metal mesh part connecting the plurality of metal walls, and surrounded by the plurality of metal walls and the metal mesh part. a display cathode comprising a plurality of negative glow generation spaces, a plurality of anodes arranged to face the plurality of negative glow generation spaces, and an opposite side of the plurality of negative glow generation spaces. A discharge display device comprising, on the side, a plurality of scanning cathodes arranged so as to intersect with the plurality of spaces for generating negative glow. 3. Consists of a plurality of metal walls arranged parallel to each other at predetermined intervals and a metal mesh part connecting the plurality of metal walls, and surrounded by the plurality of metal walls and the metal mesh part. a cathode comprising a plurality of negative glow generation spaces, a plurality of anodes arranged so as to face the plurality of negative glow generation spaces, and an opposite side of the plurality of negative glow generation spaces; , a plurality of optical shutters arranged to intersect with the plurality of spaces for generating negative glow.