JP2969525B2 - Cathode for discharge display device and discharge display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cathode for a discharge display device and a discharge display device.

[Conventional technology]

Plasma display as gas discharge display
There are two types of panels (PDP): AC (alternating current) type and DC (direct current) type. The AC type PDP has the advantage that the electrode is covered with an insulating layer, so that the electrode does not receive direct ion bombardment, so that the life of the electrode is long. However, it has drawbacks such as being difficult and therefore expensive.

In contrast, DC-type PDPs have the advantage that they are simple to manufacture, easy to drive, and thus inexpensive,
On the other hand, since the electrode is not covered with the insulating layer, there is a disadvantage that the electrode is directly subjected to ion bombardment and the life of the electrode is short.

Next, a conventional example of a DC PDP will be described with reference to FIG. The DC type PDP shown in FIG. 14 has a high resolution in which electrodes are formed by a thick film printing technique. A plurality of stripe-shaped cathodes K are arranged in parallel on a rear glass plate (1) at predetermined intervals. At the same time, a plurality of strip-shaped anodes A are arranged parallel to each other at a predetermined interval so as to be orthogonal to each other at a predetermined interval from the plurality of cathodes K. A bar-shaped partition wall made of an insulating material is arranged. The anode A
The partition BR is formed on a front glass plate (not shown).

Next, another conventional example of a DC PDP will be described with reference to FIG. The DC type PDP shown in FIG. 15 uses a strap-shaped metal plate as the cathode K and a metal wire as the anode A. A display cell hole H is formed at a portion of the cathode K crossing the anode A. Have been. The plurality of anodes A are disposed in grooves formed in the rear glass plate (1), and a portion between the grooves of the rear glass plate (1) is
This corresponds to the partition BR of the DC type PDP in FIG.

[Problems to be solved by the invention]

In the DC-type PDP of FIG. 14 described above, the electrode K is formed by the thick film printing technique, so that the service life is considerably shortened due to ion sputtering by direct ion bombardment, impurity gas release from the cathode K, and the like.

On the other hand, the DC-type PDP of FIG. 15 has a longer life than the DC-type PDP of FIG. 14, since the cathode K is made of a metal plate and the anode A is made of a metal wire. The size of the display cell hole H of the cathode K and the size of the cathode K
High-resolution DC-type PD
It is almost impossible to get P.

In view of the above, the first aspect of the present invention is to propose a cathode for a discharge display device that enables a long life, high luminance, high luminous efficiency, high resolution, and low cost of the discharge display device. is there.

Further, the second present invention provides a long life, high brightness, high luminous efficiency,
It is intended to propose an apparatus for high-resolution and low-cost discharge display.

Further, a third aspect of the present invention is to propose a long life, high luminance, high luminous efficiency, and inexpensive discharge display device.

[Means for solving the problem]

A first aspect of the present invention includes a plurality of metal wall portions W arranged at predetermined intervals so as to be parallel to each other, and a metal mesh portion M connecting the plurality of metal wall portions W. A plurality of spaces surrounded by W and the metal mesh portion M are cathodes for a discharge display device which are formed as spaces for generating negative glow.

The second invention includes a plurality of metal wall portions W arranged at predetermined intervals so as to be parallel to each other and a metal mesh portion M connecting the plurality of metal wall portions W, and a plurality of metal wall portions W A display cathode K in which a plurality of spaces surrounded by W and the metal mesh portion M are used as a negative glow generating space, a plurality of anodes A arranged so as to face the plurality of negative glow generating spaces, A plurality of scanning cathodes (3) arranged so as to intersect with the plurality of negative glow generating spaces on the side opposite to the plurality of anodes A with respect to the negative glow generating space.
And a discharge display device having:

A third aspect of the present invention includes a plurality of metal wall portions W arranged at predetermined intervals so as to be parallel to each other and a metal mesh portion M connecting the plurality of metal wall portions W. A cathode K in which a plurality of spaces surrounded by W and the metal mesh portion M are used as negative glow generating spaces, a plurality of anodes A arranged so as to face the plurality of negative glow generating spaces, and a plurality of negative electrodes; A discharge display device having a plurality of optical shutters (4) arranged so as to intersect a plurality of negative glow generating spaces on a side opposite to the plurality of anodes A with respect to the glow generating space.

[Action]

According to the first cathode K for a discharge display device of the present invention, a plurality of metal wall portions W arranged in parallel with each other at a predetermined interval and a metal mesh portion M connecting the plurality of metal wall portions W are provided. And a plurality of spaces surrounded by a plurality of metal walls W and a metal mesh M are used as spaces for generating negative glow. When the cathode K is applied to a discharge display device, a hollow effect is easily generated. When the cathode K is used as a display cathode and the scanning cathode (3) is separately provided, the problems of sputtering and impurity gas are eliminated, so that the life of the discharge display device can be extended, and the display cathode can be provided. K has a hollow effect more easily and has a larger surface area than a striped cathode, so that high luminous efficiency and high brightness can be obtained. The scanning cathode can be made high definition by a thick film printing technique. Resolution of discharge display device can be achieved.

According to the second discharge display device of the present invention, the discharge display device includes a plurality of metal wall portions W arranged at predetermined intervals so as to be parallel to each other and a metal mesh portion M connecting the plurality of metal wall portions W, A display cathode K in which a plurality of spaces surrounded by a plurality of metal wall portions W and a metal mesh portion M is a space for generating a negative glow, and a plurality of cathodes arranged so as to face the plurality of spaces for generating a negative glow. Since it has an anode A and a plurality of scanning cathodes (3) arranged so as to cross the plurality of negative glow generating spaces on the side opposite to the plurality of negative glow generating spaces with respect to the plurality of negative glow generating spaces, Display cathode K
Easily produce the hollow effect, and the display cathode K eliminates the problems of sputtering and impurity gas.
The service life can be prolonged, and the surface area is larger than that of the striped cathode, so that high brightness and high luminous efficiency can be obtained. Since the scanning cathode can be made high definition, high resolution can be realized.

According to the third discharge display device of the present invention, the discharge display device includes a plurality of metal wall portions W arranged parallel to each other at a predetermined interval and a metal mesh portion M connecting the plurality of metal wall portions W, A cathode K in which a plurality of spaces surrounded by a plurality of metal wall portions W and a metal mesh portion M are used as a negative glow generating space, and a plurality of anodes A arranged so as to face the plurality of negative glow generating spaces. And a plurality of optical shutters (4) arranged so as to intersect with the plurality of negative glow generating spaces on the side opposite to the plurality of anodes A with respect to the plurality of negative glow generating spaces. Compared with the striped cathode, the hollow effect is more likely to be produced and the surface area is increased, so that both the luminous efficiency and the luminous brightness are increased.

〔Example〕

The configuration of an embodiment of the cathode K according to the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view of a part of the cathode K, and FIG.
3 is a plan view of a part of the cathode K of FIG.
FIG. 3 is a cross-sectional view taken along the line III-III.

The cathode K is a sheet-like electrode composed of a plurality of metal wall portions W arranged at predetermined intervals so as to be parallel to each other and a metal mesh portion M connecting the plurality of metal wall portions W. A plurality of spaces surrounded by the wall portion W and the metal mesh portion M are used as negative glow generation spaces,
The materials are Ni, stainless steel, Al, 426
Alloys and the like are possible.

Here, the thickness d (constant) of the wall portion W is smaller than the gap length D (constant) between the wall portions W, and the height h (constant) of the wall portion W above the mesh portion M is the wall portion W Is selected to be larger than the thickness d. Incidentally, h '(constant) in FIG.
Is shown.

These dimensions d, D, and h of the cathode K are set according to the required resolution of the discharge display device in which the cathode K is used. As an example, the number of pixels is 640 x 400 dots,
DC type PD for personal computer with 0.33mm pixel pitch
When the cathode K is applied to P, the dimensions d, D, and h are d = 0.1 mm, D = 0.23 mm, and h = 0.2 mm, respectively, and the dimension h ′ is 1 / h of h. Less than 2.

Such a cathode K can be easily obtained by etching both surfaces of a single metal plate. However, it is also possible to manufacture the mesh portion M and the wall portion W separately and then form them by welding. good.

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

In this discharge display device, a plurality of metal walls W arranged in parallel with each other at predetermined intervals and a metal connecting the plurality of metal walls W are described in detail with reference to FIGS. A display cathode K composed of a mesh portion M and constituted by a plurality of spaces surrounded by a plurality of metal wall portions W and a metal mesh portion M as a space for generating a negative glow is provided with an insulating strap-like spacer (a wall portion). (With function) (2a)
It is applied on a front glass plate (2).

Also, a plurality of strap-like transparent anodes (upper electrodes) A arranged so as to face the plurality of negative glow generation spaces.
Is formed on the front glass plate (2) by thick film printing in a similar manner at a fixed width and a fixed interval in each gap between the plurality of spacers (2a).

Further, on a side opposite to the plurality of anodes A with respect to the plurality of negative glow generating spaces, a plurality of striped scanning cathodes (lower electrodes) intersecting with the plurality of negative glow generating spaces, that is, orthogonally arranged. ) (3) is formed on the rear glass plate (1) by thick film printing technology with similar width and spacing. In addition, in each gap between the plurality of scanning cathodes (3), an insulating striped spacer (1a) is formed with a constant width and a constant interval by thick film printing.

FIG. 8 shows an example of voltage-current characteristics between the anode A and the cathode K of the discharge display device. In this example, the power supply voltage is 180 V and the discharge start voltage is 160 V.

Next, the operation of the discharge display device will be described. The display cathode K has an ON potential (0 V) of the scanning cathode (3).
Is always applied. An ON potential is sequentially applied to the scanning cathode (3). OF of this cathode (3)
The F potential is 100V. As shown in FIG.
N, that is, when a potential of 180 V is applied to the anode A and the cathode (3) is ON, a negative current is generated in a space for generating glow surrounded by the wall W and the mesh M facing the cathode K and the anode A. Glow occurs. Incidentally, even if the cathode (3) is ON, the anode A is OFF.
No negative glow occurs in that space.

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

As described above, the cathode K is always supplied with the cathode potential and immediately the potential of 0 V.
Is turned on, a discharge may occur between the anode A and the cathode K. However, as is evident from FIG. 7, the lines of electric force from the anode A to the cathode K before discharge occurs, that is, in a state where there is no space charge, are as follows.
Where the cathode (3) is ON, the potential of the cathode (3) is affected, the density of lines of electric force increases, and the electric field between the anode A and the cathode K is strengthened. Occurs, but the cathode (3) is OF
At F, electric field lines from the cathode (3) to the cathode K occur, so that the density of the electric field lines between the anode A and the cathode K becomes low, and the electric field between the anode A and the cathode K is weakened. No negative glow occurs.
In this case, the ON potential of the cathode (3) is
By setting the potential slightly lower than the ON potential, it is possible to more reliably control the occurrence of negative glow.

In such a discharge display device, the scanning cathode (3)
The display cathode K mainly has a function of determining the generation position of the negative glow in cooperation with the anode A and contributes to the generation of the negative glow by emitting secondary electrons.

When the anode A and the cathode (3) are both ON, negative glow mutual interference occurs in a discharge space surrounded by both the wall portions W and the mesh portion M of the cathode K, that is, a hollow effect occurs. Cathode K from cathode (3)
Generates more secondary electrons. For this reason, the ion bombardment on the cathode (3) is greatly reduced, and the life of the discharge display device is not shortened even if the cathode (3) is formed by thick film printing.

Further, since the hollow effect occurs when the ends of the negative glow on the opposite side to the cathode are in contact with each other, as shown in FIG. The optimum range defined between the pressure and the gas pressure is generally narrow, but the cathode K comprising the wall W and the mesh M
In the case of (1), as shown in FIG. 9A, the effect of the mesh portion M and the cathode (3) has the same effect as the case where both walls are brought close to each other. The effect is great.

As the cathode K, a metal plate having a large number of holes as shown in FIG. 13A, a metal plate as shown in FIG. 13B, and a metal plate as shown in FIG. 13C. And a plurality of slits are formed on the substrate. But the second
13A and B, it is difficult to position the anode A and the cathode (3), and the priming effect cannot be expected because the discharge cells are independent. 13C does not have the disadvantages of FIGS. 13A and 13B, but has a low structural strength of the cathode and is not suitable for a high-definition or large-sized discharge display device. Moreover, those in FIGS. 13A, B and C are:
A plurality of metal wall portions W and a metal mesh portion M connecting the plurality of metal wall portions W are arranged in parallel with each other at a predetermined interval as described above. The hollow effect is less likely to occur as compared with the cathode K in which a plurality of spaces surrounded by M are spaces for generating negative glow.

According to the discharge display device, the discharge display device includes a plurality of metal walls W arranged at predetermined intervals so as to be parallel to each other and a metal mesh portion M connecting the plurality of metal walls W,
Since a display cathode K and a scanning cathode (3) are provided, in which a plurality of spaces surrounded by a plurality of metal wall portions W and a metal mesh portion M are spaces for generating a negative glow, the following is provided. effective. The cathode (3) is hardly affected by cathode sputtering and impurity gas emission, and the cathode K is resistant to cathode sputtering and impurity gas emission, so that the life of the discharge display device is extended. The cathode K is
Since the hollow effect is easily produced and the surface area is larger than that of the striped cathode, the luminous efficiency and the luminous brightness of the discharge display device are both increased. The cathode K has a high structural strength and is easily aligned with the anode A and the cathode (3). Since the cathode (3) can be formed with high definition by thick film printing, the resolution of the discharge display device can be increased.

Next, with reference to FIGS. 10 and 12, another embodiment of the discharge display device (XY matrix type PDP) according to the present invention will be described. FIG. 10 is a perspective view of a part of the discharge display device, FIG. 11 is a sectional view of a part thereof, and FIG. 12 is a schematic plan view thereof. This discharge display device has been described in detail with reference to FIGS. It is composed of a plurality of metal walls W arranged at a predetermined interval so as to be parallel to each other and a metal mesh M connecting the plurality of metal walls W, and is surrounded by the plurality of metal walls W and the metal mesh M. The cathode K having a plurality of spaces formed as negative glow generation spaces is placed on the front glass plate (2) such that the lower ends of the mesh portions M and the wall portions W are on the front glass plate (2) side. Be deposited.

Then, a plurality of striped anodes A arranged so as to face the plurality of negative glow generation spaces are formed on the rear glass plate (1) with a constant width and a constant interval by thick film printing, Also, on the back glass (1), a plurality of stripe-shaped spacers (2a) are formed at a certain width and at a certain interval by thick film printing in the middle of the plurality of anodes A. Then, the upper end of the wall W of the cathode K is abutted on the plurality of spacers (2a).

On the cathode K side, as shown in FIG. 12, a plurality of stripe-shaped liquid crystal shutters (polarized light) arranged at a constant width and a constant interval so that the respective wall portions W of the cathode K intersect, that is, are orthogonal to each other. An optical shutter such as a shutter is also provided.) (4)
Is provided.

The switches SW-A are sequentially connected to the plurality of anodes A.
When turned on, an ON potential of 200 V is applied. In addition, switch SW−
When A is OFF, each anode A
Is supplied with a potential of 100V. The ground potential is always applied to the cathode K. Further, the liquid crystal shutter (4) is turned on and off according to a video signal to be displayed.
A predetermined potential is applied through the switch SW-4 to control the transparency and the opacity.

According to the discharge display device, the discharge display device includes a plurality of metal walls W arranged at predetermined intervals so as to be parallel to each other 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 plurality of metal wall portions W and the metal mesh portions M are spaces for generating negative glow, the following effects are obtained. Cathode K
Is resistant to sputtering of the cathode and emission of impurity gas, so that the life of the discharge display device is prolonged. Since the cathode K easily produces the hollow effect and has a larger surface area than the stripe-shaped cathode, the luminous efficiency and the luminous brightness of the discharge display device are both increased. The cathode K has a high structural strength and is easily aligned with the anode A.

〔The invention's effect〕

According to the first aspect of the present 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, and furthermore, the structural strength is high, The cathode which can be easily aligned with the electrode can be obtained.

Further, according to the second aspect of the present invention, a long life, high luminance, high luminous efficiency, high resolution, and inexpensive discharge display device can be obtained.

Further, according to the third aspect of the present invention, it is possible to obtain a long life, high luminance, high luminous efficiency and inexpensive discharge display device.

[Brief description of the drawings]

1, 2 and 3 show a perspective view, a plan view and a sectional view, respectively, of a part of an embodiment of the cathode according to the present invention.
FIGS. 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.
FIG. 8 is a cross-sectional view for explaining the operation, FIG. 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, FIG. FIGS. 12 and 13 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. FIG. 13 is a plan view showing a part of a reference example of the cathode, and FIG. 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 and M are the wall and mesh portions of the display cathode, A is the anode, (1) is the back glass plate, (2) is the front glass plate, (1a) and (2a) are each The spacer (3) is a scanning cathode.

Claims (3)

(57) [Claims] A plurality of metal walls arranged parallel to each other at predetermined intervals and a metal mesh connecting the plurality of metal walls, wherein the plurality of metal walls and the metal are provided. A cathode for a discharge display device, wherein a plurality of spaces surrounded by a mesh portion are spaces for generating negative glow. A plurality of metal walls arranged parallel to each other at a predetermined interval and a metal mesh connecting the plurality of metal walls, wherein the plurality of metal walls and the metal mesh are provided. A display cathode in which a plurality of spaces surrounded by the portions are negative glow generation spaces; a plurality of anodes arranged to face the plurality of negative glow generation spaces; and a plurality of negative glow generation spaces A discharge display device comprising: a plurality of scanning cathodes arranged so as to intersect with the plurality of negative glow generation spaces on a side opposite to the plurality of anodes with respect to the space. 3. A plurality of metal wall portions and a metal mesh portion connecting said plurality of metal wall portions arranged in parallel with each other at a predetermined interval, said plurality of metal wall portions and said metal mesh. A display cathode in which a plurality of spaces surrounded by the portions are negative glow generation spaces; a plurality of anodes arranged to face the plurality of negative glow generation spaces; and a plurality of negative glow generation spaces A discharge display device comprising: a plurality of optical shutters arranged on a side opposite to the plurality of anodes with respect to a space so as to cross the plurality of negative glow generation spaces.