JP2004186062A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device of a high brightness and a high contrast in which a stable address discharge is realized by reducing abnormal discharge at the time of address. <P>SOLUTION: The plasma display device has a first substrate 11, a second substrate 21 which counters inside the first substrate 11 and is arranged and in which a discharging space 4 sealed in between is formed, and at least a pair of a discharge maintenance electrodes 12a on the scan side and a discharge maintenance electrode 12b on the common side which are formed on the inner side of the first substrate and in which a discharging gap is formed between each other, a bus electrode 13a on the scan side formed along a longitudinal direction of the discharge maintenance electrode 12a on the scan side, a bus electrode 13b on the common side formed along the longitudinal direction of the discharge maintenance electrode 12b on the common side, and an address electrode 22 formed on the inner side of the second substrate 21 in a direction to intersect the discharge maintenance electrode 12. Thickness of at least one part of the bus electrode 13a on the scan side to intersect the address electrode 22 to pinch the discharging space 4 is thicker than the thickness of the bus electrode 13b on the common side. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma display device, and more particularly, to a plasma display device with high luminance and high contrast that realizes stable address discharge by reducing abnormal discharge at the time of addressing.
[0002]
[Prior art]
Various flat-panel (flat-panel) display devices have been studied as image display devices to replace the current mainstream cathode ray tube (CRT). Examples of such a flat display device include a liquid crystal display device (LCD), an electroluminescence display device (ELD), and a plasma display device (PDP: plasma display). Among them, the plasma display device has advantages such as relatively easy enlargement of the screen and wide viewing angle, excellent resistance to environmental factors such as temperature, magnetism and vibration, and long life. It is expected to be applied to large information terminal equipment for public use in addition to home wall-mounted televisions.
[0003]
The plasma display device applies a voltage to a discharge cell in which a discharge gas made of a rare gas is sealed in a discharge space, and excites a phosphor layer in the discharge cell with ultraviolet rays generated based on a glow discharge in the discharge gas. This is a display device that obtains light emission. That is, the individual discharge cells are driven according to a principle similar to that of a fluorescent lamp, and the discharge cells are usually assembled in the order of several hundred thousand to form one display screen. Plasma display devices are roughly classified into a direct current drive type (DC type) and an alternating current drive type (AC type) according to a method of applying a voltage to a discharge cell, and each has advantages and disadvantages.
[0004]
The AC-type plasma display device is suitable for high definition, because the partition walls that serve to partition the individual discharge cells in the display screen may be formed in a stripe shape, for example. In addition, since the surface of the electrode for discharging is covered with the dielectric layer, such an electrode has advantages that it is hard to be worn and has a long life. As an example of the AC type plasma display device, for example, a three-electrode type plasma display device disclosed in Patent Document 1 or Patent Document 2 below is exemplified.
[0005]
In a conventional plasma display device, a discharge gas sealed in a discharge space is composed of an inert gas such as a neon (Ne) gas, a helium (He) gas, an argon (Ar) gas, and a xenon (Xe) gas of 4 volumes. %, And the discharge gap between the pair of sustain electrodes is about 100 μm.
[0006]
[Problems to be solved by the invention]
In an AC type plasma display device currently commercialized, its low luminance is a problem. For example, the luminance of a 42-inch AC plasma display device is 900 cd / m at most.²It is about. Moreover, in actually commercializing an AC type plasma display device, for example, it is necessary to attach a sheet or a film for shielding electromagnetic waves or preventing reflection of external light on the outer surface of the display surface side panel. The actual display light at the point becomes considerably dark. Therefore, if the pressure of the discharge gas sealed in the discharge space is increased for the purpose of increasing the brightness, the discharge voltage becomes higher, the discharge becomes unstable, or the discharge becomes non-uniform. Occurs.
[0007]
Further, in the current AC type plasma display device, low contrast is also a problem. The cause is light emission at the black level due to discharge at the time of reset and discharge at the time of address. In order to reduce the light emission at the black level, it is necessary to reduce the number of discharges other than the sustain discharge and to reduce the light emission intensity.
[0008]
As disclosed in Patent Document 3 below, a plasma display device in which bus electrodes have different widths on the scan side and the common side is known. However, in this plasma display device, in order to reduce the line resistance of the sustaining electrode, only the width of the bus electrode is increased. Patent Document 3 does not disclose means for reducing abnormal discharge at the time of addressing to realize a stable address discharge and realizing a plasma display device with high luminance and high contrast.
[0009]
[Patent Document 1] JP-A-5-307935
[Patent Document 2] JP-A-9-160525
[Patent Document 3] JP-A-2000-353473
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a plasma display device that realizes stable address discharge by reducing abnormal discharge at the time of address, and has high luminance and high contrast. is there.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a plasma display device according to a first aspect of the present invention includes:
A first substrate;
A second substrate disposed opposite to the inside of the first substrate to form a sealed discharge space therebetween;
At least a pair of scan-side sustain electrodes and a common-side sustain electrode formed inside the first substrate and forming a discharge gap therebetween;
A scan-side bus electrode formed along a longitudinal direction of the scan-side sustain electrode;
A common-side bus electrode formed along the longitudinal direction of the common-side sustain electrode,
An address electrode formed inside the second substrate in a direction intersecting with the discharge sustaining electrode,
At least a portion of the scan-side bus electrode that intersects with the address electrode across the discharge space is thicker than the common-side bus electrode.
[0011]
The discharge between the address electrode and the scan-side sustain electrode depends on the accumulated amount of wall charges and the distance between the electrodes according to Paschen's law. In the conventional AC drive type plasma display device, the distance between the address electrode and the scan-side discharge sustaining electrode is substantially defined by the height of the rib, and is therefore about 100 μm. At such a distance, the shorter the distance, the lower the discharge voltage, and the shorter the distance between the address electrode and the scan electrode, the lower the address voltage.
[0012]
However, if the height of the ribs is simply reduced, the discharge space becomes narrow, the brightness in the sustain discharge between the pair of sustain electrodes is reduced, and the efficiency is also reduced. Therefore, by increasing the thickness of the bus electrode closest to the address electrode among the scan-side discharge sustaining electrodes that affect the address discharge, the address space can be easily made without narrowing the discharge space. . This is because the distance between the scan-side bus electrode and the address electrode becomes shorter.
[0013]
That is, according to the first aspect of the present invention, it is possible to provide a plasma display device with high luminance and high contrast that realizes stable address discharge by reducing abnormal discharge at the time of addressing.
[0014]
In the first aspect of the present invention, the thickness of the scan-side bus electrode may be uniformly larger in the longitudinal direction than the thickness of the common-side bus electrode. In that case, patterning of the bus electrode is easy.
[0015]
Alternatively, in the first aspect of the present invention, the thickness of the scan-side bus electrode may be larger than the thickness of the common-side bus electrode only in the vicinity of a portion that intersects with the address electrode across the discharge space. good. This is because, for the purpose of shortening the discharge distance from the address electrode, the thickness of only the intersection with the address electrode need be increased without increasing the thickness of the entire bus electrode.
[0016]
Preferably, the thickness of the scan-side bus electrode is greater than the thickness of the common-side bus electrode in the vicinity of a portion intersecting the address electrode across the discharge space, and a partition wall that holds the height of the discharge space. In the vicinity of the intersection, the thickness is substantially equal to the thickness of the common-side bus electrode. By reducing the thickness of the scan-side bus electrode at the intersection with the partition, the space above the partition can be reduced, and crosstalk can be reduced.
[0017]
The plasma display device according to the second aspect of the present invention includes:
A first substrate;
A second substrate disposed opposite to the inside of the first substrate to form a sealed discharge space therebetween;
At least a pair of scan-side sustain electrodes and a common-side sustain electrode formed inside the first substrate and forming a discharge gap therebetween;
A scan-side bus electrode formed along a longitudinal direction of the scan-side sustain electrode;
A common-side bus electrode formed along the longitudinal direction of the common-side sustain electrode,
An address electrode formed inside the second substrate in a direction intersecting with the discharge sustaining electrode,
The distance between the scan-side bus electrode and the address electrode that intersects across the discharge space is smaller than the distance between the common-side bus electrode and the address electrode that intersects across the discharge space. It is characterized in that both bus electrodes are arranged inside the first substrate.
[0018]
According to the second aspect of the present invention, it is not always necessary to make the thickness of the scan-side bus electrode thicker than that of the common-side bus electrode. For example, a dielectric layer is interposed between the scan-side discharge sustaining electrode connected to the scan-side bus electrode and the first substrate, and the common-side discharge sustaining electrode connected to the common-side bus electrode is connected to the first substrate. The configuration according to the second aspect of the present invention can be realized by not interposing a dielectric layer between them.
[0019]
With this configuration, similarly to the first aspect of the present invention, it is possible to shorten the distance between the scan-side bus electrode and the address electrode without narrowing the discharge space, thereby facilitating the address discharge. Therefore, also in the second aspect of the present invention, a stable address discharge can be realized by reducing abnormal discharge at the time of addressing, and a plasma display device with high luminance and high contrast can be provided.
[0020]
A plasma display device according to a third aspect of the present invention includes:
A first substrate;
A second substrate disposed opposite to the inside of the first substrate to form a sealed discharge space therebetween;
At least a pair of scan-side sustain electrodes and a common-side sustain electrode formed inside the first substrate and forming a discharge gap therebetween;
A scan-side bus electrode formed along a longitudinal direction of the scan-side sustain electrode;
A common-side bus electrode formed along the longitudinal direction of the common-side sustain electrode,
An address electrode formed inside the second substrate in a direction intersecting with the discharge sustaining electrode;
A plasma display device having
A width of at least a part of the scan-side bus electrode that intersects with the address electrode across the discharge space is wider than a width of the common-side bus electrode.
[0021]
By changing the width (thickness) of the scan-side bus electrode instead of changing the thickness of the scan-side bus electrode, the area of the portion caused by the discharge can be increased. Can be easily discharged. Therefore, also in the third aspect of the present invention, a stable address discharge can be realized by reducing abnormal discharge at the time of addressing, and a high-luminance and high-contrast plasma display device can be provided.
[0022]
In a third aspect of the present invention, the width of the scan-side bus electrode may be uniformly wider in the longitudinal direction than the width of the common-side bus electrode. In that case, patterning of the bus electrode is easy.
[0023]
Alternatively, the width of the scan-side bus electrode may be wider than the width of the common-side bus electrode only in the vicinity of a portion that intersects with the address electrode across the discharge space. It is sufficient to increase the width of the scan-side bus electrode only in a portion that greatly affects stable discharge at the time of addressing. Further, in this case, since only the necessary portion of the scan-side bus electrode is widened, there is no waste of material. Furthermore, although the bus electrode is made of a material that blocks light, the portion that blocks light can be minimized.
[0024]
Preferably, in the first to third aspects of the present invention, preferably, the discharge gap is 5 × 10^-5m. By setting the discharge gap within the above range, the sustain discharge between the scan-side sustain electrode and the common-side sustain electrode can be more easily generated, and the address discharge can be facilitated.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is a schematic exploded perspective view of a main part of a plasma display device according to an embodiment of the present invention,
FIG. 2 is a main part plan view showing a relationship among a partition, an address electrode, a sustain electrode, and a bus electrode shown in FIG. 1;
FIG. 3 is a schematic cross-sectional view of a main part along the line III-III shown in FIG.
FIG. 4 is a main part plan view showing a relationship among partition walls, address electrodes, discharge sustaining electrodes, and bus electrodes in a plasma display device according to another embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a main part along line VV in FIG.
FIG. 6 is a schematic cross-sectional view of a main part of a plasma display device according to still another embodiment of the present invention, similar to FIG.
FIG. 7 is a main part plan view showing a relationship among partition walls, address electrodes, discharge sustaining electrodes, and bus electrodes in a plasma display device according to still another embodiment of the present invention;
FIG. 8 is a main part plan view showing a relationship among partition walls, address electrodes, discharge sustaining electrodes, and bus electrodes in a plasma display device according to still another embodiment of the present invention;
FIG. 9 is a graph showing a relationship between a distance between a scan-side sustain electrode and an address electrode and an address voltage;
FIG. 10 is a graph showing a relationship between a discharge space height and luminance.
[0026]
First embodiment
Overall configuration of plasma display device
First, an overall configuration of an AC-driven (AC) plasma display device (hereinafter sometimes simply referred to as a plasma display device) will be described with reference to FIG.
[0027]
The AC type plasma display device 2 shown in FIG. 1 includes a first panel 10 corresponding to a front panel and a second panel 20 corresponding to a rear panel, which are bonded together. Light emission of the phosphor layers 25R, 25G, and 25B on the second panel 20 is observed through the first panel 10. That is, the first panel 10 is on the display surface side.
[0028]
The first panel 10 includes a transparent first substrate 11 and a plurality of pairs of discharge sustaining electrodes 12 made of a transparent conductive material and provided on the first substrate 11 in a stripe shape substantially parallel to each other along a first direction X. A bus electrode 13 provided to reduce the impedance of the sustain electrode 12 and having a lower electrical resistivity than the sustain electrode 12, and a first substrate 11 including the bus electrode 13 and the discharge sustain electrode 12. It comprises a dielectric layer 14 formed thereon and a protective layer 15 formed thereon. Note that the protective layer 15 is not necessarily formed, but is preferably formed.
[0029]
On the other hand, the second panel 20 includes a second substrate 21 and a plurality of strips provided on the second substrate 21 in a stripe shape along the second direction Y (substantially perpendicular to the first direction X) and substantially parallel to each other. An address electrode (also referred to as a data electrode) 22; an insulator film 23 formed on the second substrate 21 including the address electrode 22; an insulating partition 24 formed on the insulator film 23; And a phosphor layer provided over the film and on the side wall surface of the partition 24. The phosphor layer includes a red phosphor layer 25R, a green phosphor layer 25G, and a blue phosphor layer 25B.
[0030]
FIG. 1 is a partially exploded perspective view of the display device. Actually, the top of the partition wall 24 on the second panel 20 side is oriented in a third direction Z (a direction orthogonal to the first direction X and the second direction Y). It is in contact with the protective layer 15 on the first panel 10 side. A discharge gas is sealed in a discharge space 4 surrounded by the partition wall 24 on which the phosphor layers 25R, 25G, and 25B are formed and the protective layer 15. The first panel 10 and the second panel 20 are joined at their peripheral portions using frit glass.
[0031]
The discharge gas sealed in the discharge space 4 is not particularly limited, but includes xenon (Xe) gas, neon (Ne) gas, helium (He) gas, argon (Ar) gas, and nitrogen (N₂Inert gas such as gas or a mixed gas of these inert gases is used. The total pressure of the sealed discharge gas is not particularly limited, but may be 6 × 10³Pa-8 × 10⁴It is about Pa.
[0032]
In the present embodiment, preferably, at least one kind of first gas selected from the group consisting of xenon (Xe) gas and krypton (Kr) gas, and neon (Ne) gas and helium (He) gas are used as the discharge gas. And a gas mixture of at least one kind of second gas selected from the group consisting of argon and argon (Ar) gas, wherein the concentration of the first gas is 30% by volume or more. In the mixed gas, for example, 1% by volume or less of argon (Ar) gas and hydrogen (H₂) Gas may be included.
[0033]
Alternatively, the discharge gas may be substantially composed of only xenon (Xe) gas and / or krypton (Kr) gas. Also in this case, for example, 1% by volume or less of argon (Ar) gas and hydrogen (H₂) Gas may be included.
[0034]
Preferably, the gas pressure of the discharge gas sealed in the discharge space 4 is 10 kPa or more, more preferably 20 kPa or more, and particularly preferably 30 kPa or more.
[0035]
The plasma display device 2 of the present embodiment is a so-called reflection type plasma display device, and the light emission of the phosphor layers 25R, 25G, and 25B is observed through the first panel 10. For this reason, it does not matter whether the conductive material constituting the address electrode 22 is transparent or opaque, but the conductive material constituting the discharge sustaining electrode 12 needs to be transparent. The transparency / opacity described here is based on the light transmittance of the conductive material at an emission wavelength (visible light region) specific to the phosphor layer material. That is, if it is transparent to the light emitted from the phosphor layer, it can be said that the conductive material forming the sustain electrode and the address electrode is transparent.
[0036]
As opaque conductive materials, Ni, Al, Au, Ag, Pd / Ag, Cr, Ta, Cu, Ba, LaB₆, Ca_0.2La_0.8CrO₃Can be used alone or in appropriate combination. Transparent conductive materials include ITO (indium tin oxide) and SnO₂Can be mentioned. The discharge sustaining electrode 12 or the address electrode 22 can be formed by a sputtering method, an evaporation method, a screen printing method, a plating method, or the like, and is patterned by a photolithography method, a sandblast method, a lift-off method, or the like.
[0037]
A bus electrode 13 is connected to each discharge sustaining electrode 12 along the longitudinal direction. The bus electrode 13 is typically formed of a metal material, for example, a single-layer metal film such as Ag, Au, Al, Ni, Cu, Mo, or Cr, or a laminated film such as Cr / Cu / Cr. Can be. The bus electrode 13 can be formed by a method similar to that of the discharge sustaining electrodes 12, 12, and the like.
[0038]
In a reflection type plasma display device, the bus electrode made of a metal material may reduce the amount of visible light transmitted from the phosphor layer and passing through the first substrate 11, and may be a factor of reducing the brightness of the display screen. Therefore, it is preferable to form the discharge sustaining electrode as thin as possible within a range where the required electric resistance value is obtained.
[0039]
However, the sustain electrode material in the present invention is not limited to being transparent. When an opaque material is used, the aperture ratio is reduced. However, as long as high luminance can be realized, even if the aperture ratio is lowered, the display does not necessarily hinder.
[0040]
The dielectric layer 14 formed on the surface of the sustain electrode 12 is typically made of low melting glass or SiO.₂, But can also be formed using other dielectric materials. For example, in the present embodiment, a single silicon oxide layer is used, but a multilayer film may be used. The dielectric layer 14 is formed based on, for example, an electron beam evaporation method, a sputtering method, an evaporation method, a screen printing method, or the like. The thickness of the dielectric layer 14 is not particularly limited, but is preferably 5.0 × 10 5 in the present embodiment.^-5m, more preferably 1 to 10 μm.
[0041]
By providing the dielectric layer 14, ions or electrons generated in the discharge space 4 can be prevented from directly contacting the discharge sustaining electrode 12. As a result, it is possible to prevent the discharge sustaining electrode 12 from being worn. The dielectric layer 14 has a memory function of accumulating wall charges generated during the address period to maintain a discharge state, and a function of a resistor for limiting an excessive discharge current.
[0042]
The protective layer 15 formed on the discharge space side surface of the dielectric layer 14 has an effect of protecting the dielectric layer 14 and preventing direct contact between ions and electrons and the discharge sustaining electrode. As a result, abrasion of the discharge sustaining electrode 12 and the dielectric layer 14 can be effectively prevented. Further, the protective layer 15 also has a function of emitting secondary electrons necessary for discharging. As a material constituting the protective layer 15, magnesium oxide (MgO), magnesium fluoride (MgF₂), Calcium fluoride (CaF₂) Can be exemplified. Among them, magnesium oxide is a suitable material having characteristics such as being chemically stable, having a low sputtering rate, having a high light transmittance at the emission wavelength of the phosphor layer, and having a low discharge starting voltage. The protective layer 15 may have a laminated film structure made of at least two kinds of materials selected from the group consisting of these materials.
[0043]
As the constituent materials of the first substrate 11 and the second substrate 21, high strain point glass, soda glass (Na₂O ・ CaO ・ SiO₂), Borosilicate glass (Na₂OB₂O₃・ SiO₂), Forsterite (2MgO.SiO)₂), Lead glass (Na₂O ・ PbO ・ SiO₂) Can be exemplified. The constituent materials of the first substrate 11 and the second substrate 21 may be the same or different, but preferably have the same coefficient of thermal expansion.
[0044]
The phosphor layers 25R, 25G, and 25B are made of, for example, a phosphor layer material selected from the group consisting of a phosphor layer material that emits red light, a phosphor layer material that emits green light, and a phosphor layer material that emits blue light. And is provided above the address electrode 22. When the plasma display device performs color display, specifically, for example, a phosphor layer (a red phosphor layer 25R) made of a phosphor layer material that emits red light is provided above the address electrode 22, and the green color is displayed. A phosphor layer (green phosphor layer 25G) made of a phosphor layer material that emits light is provided above another address electrode 22, and a phosphor layer (a blue phosphor layer) made of a phosphor layer material that emits blue light is provided. A body layer 25B) is provided above another address electrode 22, and a set of these three primary color-emitting phosphor layers is provided in a predetermined order.
[0045]
A region where a pair of discharge sustaining electrodes overlaps with a pair of phosphor layers that emit these three primary colors corresponds to one pixel (one pixel). The red phosphor layer, the green phosphor layer, and the blue phosphor layer may be formed in a stripe shape or in a lattice shape.
[0046]
As the phosphor layer material constituting the phosphor layers 25R, 25G, and 25B, a phosphor layer material having a high quantum efficiency and a low saturation with respect to vacuum ultraviolet rays is appropriately selected and used from conventionally known phosphor layer materials. be able to. Assuming color display, the phosphor has a color purity close to the three primary colors specified by NTSC, a white balance when the three primary colors are mixed, a short afterglow time, and a nearly equal afterglow time for the three primary colors. It is preferred to combine layer materials.
[0047]
Specific examples of the phosphor layer material are shown below. For example, as a phosphor layer material that emits red light upon irradiation with vacuum ultraviolet light, (Y₂O₃: Eu), (YBO₃Eu), (YVO₄: Eu), (Y_0.96P_0.60V_0.40O₄: Eu_0.04), [(Y, Gd) BO₃: Eu], (GdBO₃: Eu), (ScBO₃: Eu), (3.5MgO.0.5MgF)₂・ GeO₂: Mn), as a phosphor layer material that emits green light by irradiation with vacuum ultraviolet light, (ZnSiO₂: Mn), (BaA1)₁₂O₁₉: Mn), (BaMg)₂A1₁₆O₂₇: Mn), (MgGa₂O₄: Mn), (YBO₃: Tb), (LuBO₃: Tb), (Sr₄Si₃O₈Cl₄: Eu), as a phosphor layer material that emits blue light upon irradiation with vacuum ultraviolet light, (Y₂SiO₅: Ce), (CaWO)₄: Pb), CaWO₄, YP_0.85V_0.15O₄, (BaMgA1₁₄O₂₃: Eu), (Sr₂P₂O₇: Eu), (Sr₂P₂O₇: Sn).
[0048]
As a method of forming the phosphor layers 25R, 25G, and 25B, a thick film printing method, a method of spraying phosphor layer particles, a method of attaching an adhesive substance in advance to a portion where a phosphor layer is to be formed, and attaching the phosphor layer particles. And a method of patterning the phosphor layer by exposure and development using a photosensitive phosphor layer paste, and a method of removing unnecessary portions by sandblasting after forming the phosphor layer on the entire surface.
[0049]
The phosphor layers 25R, 25G, and 25B may be formed directly on the address electrodes 22, or may be formed on the address electrodes 22 and on the side wall surfaces of the partition walls 24. Alternatively, the phosphor layers 25R, 25G, and 25B may be formed on the insulator film 23 provided on the address electrode 22, or the partition walls may be formed on the insulator film 23 provided on the address electrode 22. 24 may be formed over the side wall surface. Further, the phosphor layers 25R, 25G, and 25B may be formed only on the side wall surface of the partition wall 24. As a constituent material of the insulator film 23, for example, low melting glass or SiO₂Can be mentioned.
[0050]
As a constituent material of the partition wall 24, a conventionally known insulating material can be used. For example, a material obtained by mixing a metal oxide such as alumina with a widely used low-melting glass can be used. The height of the partition 24 is about 50 to 200 μm.
[0051]
A discharge gas made of a mixed gas is sealed in the discharge space 4 surrounded by the partition wall 24, and the phosphor layers 25R, 25G, and 25B are formed based on a glow discharge generated in the discharge gas in the discharge space 4. It emits light when irradiated with the generated ultraviolet light.
[0052]
In the present embodiment, a pair of partition walls 24 formed on the second substrate 21, a pair of discharge sustaining electrodes 12 and 12 occupying an area surrounded by the pair of partition walls 24, the address electrode 22, and the phosphor layer 25 R , 25G, and 25B constitute one discharge cell. A discharge gas made of a mixed gas is sealed inside the discharge cell, more specifically, in a discharge space surrounded by the partition wall 24, and the phosphor layers 25R, 25G, and 25B are formed in the discharge space. It emits light when irradiated with ultraviolet light generated based on AC glow discharge generated in the discharge gas.
[0053]
In the present embodiment, the direction in which the projected image of the discharge sustaining electrode 12 (bus electrode 13) extends and the direction in which the projected image of the address electrode 22 extends are substantially orthogonal (although not necessarily orthogonal). As shown in FIGS. 2 and 3, in the present embodiment, the discharge sustaining electrodes 12 are arranged so as to form a pair with the scan-side discharge sustaining electrodes 12a and the common-side discharge sustaining electrodes 12b, and between them. A discharge gap G is formed.
[0054]
The discharge gap G is preferably 1 to 150 μm, more preferably 5 to 50 μm, and still more preferably 5 to 40 μm. The width of each discharge sustaining electrode 12 in the second direction Y is determined by the size of the pixel and the like, and is not particularly limited, but is preferably 50 to 280 μm. The thickness of each discharge sustaining electrode 12 is not particularly limited, but is preferably 0.1 to 0.5 μm.
[0055]
The bus electrode 13 is composed of a pair of a scan-side bus electrode 13a connected to the scan-side sustain electrode 12a and a common-side bus electrode 13b connected to the common-side sustain electrode 12b. In the present embodiment, the thickness t2 of the scan-side bus electrode 13a is larger than the thickness t1 of the common-side bus electrode 13b. Preferably, these differences (t2-t1) are between 1 and 20 μm. If the difference in thickness is too small, the effect of the present invention is small, and if it is too large, the height of the discharge space 4 tends to be narrowed.
[0056]
The thickness t1 of the common-side bus electrode 13b is the same as the thickness of a general bus electrode, and is preferably 1 to 20 μm. In the present embodiment, the widths of the bus electrodes 13 (13a, 13b) are all substantially the same and are not particularly limited, but are preferably 1/10 to 1/2 the width of the discharge sustaining electrodes 12. It is. The width of the address electrode 22 is not particularly limited, but is, for example, about 50 to 100 μm.
[0057]
In order to form a discharge gap G for each discharge cell, the discharge sustaining electrodes 12 made of a transparent electrode are formed continuously along the first direction X. The cells may be completely separated and formed into an island shape. By forming the discharge sustaining electrode 12 formed of a transparent electrode separately for each discharge cell in the first direction X, the reactive current is reduced and the current consumption is reduced without lowering the luminance. However, the bus electrode 13 forming a part of the discharge sustaining electrode 12 cannot be divided along the first direction X. This is for supplying a voltage signal to the discharge sustaining electrode 12 made of a transparent electrode. Each of the sustaining electrodes 12 is formed of a transparent electrode and has a relatively high resistance. Therefore, each of the sustaining electrodes 12 is connected to a bus electrode 13 formed along the first direction X.
[0058]
Since a glow discharge occurs between the pair of discharge sustaining electrodes 12 forming the discharge gap 30, this type of plasma display device is called a "surface discharge type". A driving method of the plasma display device will be described later.
[0059]
Manufacturing method of plasma display device
Next, a method for manufacturing the plasma display device according to the embodiment of the present invention will be described. The first panel 10 can be manufactured by the following method. First, an ITO layer is formed on the entire surface of a first substrate 11 made of high strain point glass or soda glass by, for example, a sputtering method, and the ITO layer is patterned in a stripe shape by a photolithography technique and an etching technique, thereby forming a discharge sustaining electrode 12. Are formed in plurality.
[0060]
Next, a chromium film is formed on the entire inner surface of the first substrate 11 by, for example, an evaporation method, and the chromium film is patterned by a photolithography technique and an etching technique. Form. In the present embodiment, it is necessary to form the scan-side bus electrode 13a of the pair of bus electrodes thicker than the common-side bus electrode 13b. For this purpose, for example, the common-side bus electrode 13b may be masked, and a chromium film may be deposited and deposited on the portion where the scan-side bus electrode 13a is formed. Alternatively, at the time of etching, only the portion where the common-side bus electrode 13b is formed may be etched deeply by using the scan-side bus electrode 13a as a mask.
[0061]
Alternatively, when the bus electrode 13 is formed by a printing method, it can be easily realized by changing the number of times of printing. In addition, after the common-side bus electrode 13b and the scan-side bus electrode 13a are simultaneously formed, only the scan-side bus electrode 13a is formed again by the lift-off method, so that only the thickness of the scan-side bus electrode 13a can be increased. is there.
[0062]
Thereafter, for example, silicon oxide (SiO 2) is formed on the entire inner surface of the extraction electrode of the first substrate 11 on which the bus electrode 13 is formed.₂A) forming a dielectric layer 14 consisting of layers; In the present embodiment, the method of forming the dielectric layer 14 is not particularly limited, and examples thereof include an electron beam evaporation method, a sputtering method, an evaporation method, and a screen printing method.
[0063]
Next, a protective layer 15 made of magnesium oxide (MgO) having a thickness of 0.6 μm is formed on the dielectric layer 14 by an electron beam evaporation method or a sputtering method. Through the above steps, the first panel 10 can be completed.
[0064]
The second panel 20 is manufactured by the following method. First, an address electrode 22 is formed on a second substrate 21 made of high strain point glass or soda glass by, for example, forming an aluminum film by a vapor deposition method and patterning the aluminum film by a photolithography technique and an etching technique. The address electrode 22 extends in a second direction Y orthogonal to the first direction X. Next, a low-melting-point glass paste layer is formed on the entire inner surface of the extraction electrode by a screen printing method, and the low-melting-point glass paste layer is baked to form an insulator film 23.
[0065]
Thereafter, a partition 24 is formed on the insulator film 23 so as to have a stripe pattern shown in FIGS. The forming method at this time is not particularly limited, and examples thereof include a screen printing method, a sand blast method, a dry film method, and a photosensitive method. Dry film method is a method of laminating a photosensitive film on a substrate, removing the photosensitive film at a portion where a partition is to be formed by exposure and development, embedding a material for forming a partition into an opening formed by the removal, and baking. It is. The photosensitive film is burned and removed by baking, and the partition wall forming material buried in the opening remains to become the partition wall 24. The photosensitive method is a method in which a photosensitive material layer for forming a partition is formed on a substrate, and the material layer is patterned by exposure and development, followed by baking. The firing (the partition firing step) is performed in the air, and the firing temperature is about 560 ° C. The firing time is about 2 hours.
[0066]
Next, three primary color phosphor layer slurries are sequentially printed between the partition walls 24 formed on the second substrate 21. Thereafter, the second substrate 21 is fired in a firing furnace to form the phosphor layers 25R, 25G, and 25B from over the insulator film between the partition walls 24 to over the side wall surfaces of the partition walls 24. The firing temperature (phosphor firing step) at that time is about 510 ° C. The firing time is about 10 minutes.
[0067]
Next, the plasma display device is assembled. That is, first, a seal layer is formed on the peripheral portion of the second panel 20 by, for example, screen printing. Next, the first panel 10 and the second panel 20 are attached to each other and fired to cure the seal layer. Then, after evacuating the space formed between the first panel 10 and the second panel 20, the discharge gas is sealed, and the space is sealed, thereby completing the plasma display device 2.
[0068]
An example of the operation of the plasma display device having such a configuration will be described. First, for example, a panel voltage higher than the discharge starting voltage Vbd is applied to all of the paired common-side sustain electrodes 12b for a short time. As a result, a glow discharge is generated, wall charges are accumulated on the surface of the dielectric layer 14 near both the sustain electrodes 12a and 12b, and the discharge start voltage is reduced. Thereafter, while applying a voltage to the address electrode 22, a voltage is applied to one scan-side discharge sustaining electrode 12a of a pair of discharge sustaining electrodes included in a discharge cell that does not perform display, so that the address electrode 22 and the one Glow discharge is generated between the scan-side discharge sustaining electrode 12a and the stored side wall charge. This erasing discharge is sequentially performed on each address electrode 22. On the other hand, no voltage is applied to one of the pair of scan-side sustain electrodes 12a included in the discharge cells to be displayed. This maintains the accumulation of wall charges. Thereafter, by applying a predetermined pulse voltage between all the pair of sustain electrodes 12a and 12b, a glow discharge starts between the pair of sustain electrodes 12a and 12b in the cell in which the wall charges have been accumulated. In the discharge cell, the phosphor layers 25R, 25G, and 25B excited by the irradiation of the vacuum ultraviolet rays generated based on the glow discharge in the discharge gas in the discharge space 4 are unique to the type of the phosphor layer material. It emits light of a color. Note that the phase of the sustaining voltage applied to one of the pair of scan-side sustaining electrodes 12a and the other side of the common-side sustaining electrode 12b is shifted by a half cycle, and the polarity of the electrodes is inverted according to the AC frequency. I do.
[0069]
Whether a cell to which a voltage is applied to the address electrode 22 maintains a discharge or a cell to which no voltage is applied maintains a discharge depends on a selective writing or erasing method. The discharge between the electrode 22 and the scan-side bus electrode 13a is required to be easy.
[0070]
In the plasma display device 2 of the present embodiment, by increasing the thickness of the scan-side bus electrode 13a closest to the address electrode 22 among the scan-side discharge sustaining electrodes 12a affecting the address discharge, the discharge space 4 is increased. , And address discharge can be easily performed without narrowing. This is because the distance between the scan-side bus electrode 13a and the address electrode 22 becomes shorter.
[0071]
That is, in the present embodiment, a stable address discharge can be realized by reducing abnormal discharge at the time of addressing, and a plasma display device with high brightness and high contrast can be provided.
[0072]
Second embodiment
In the present embodiment, as shown in FIG. 4, the thickness of the scan-side bus electrode 13a1 is larger than the thickness of the common-side bus electrode 13b only in the vicinity of the portion 30 intersecting the address electrode 22 across the discharge space 4. The other portions have the same thickness as the common-side bus electrode 13b. Other configurations of the present embodiment are the same as those of the first embodiment. This is because, for the purpose of shortening the discharge distance from the address electrode 22, it is only necessary to increase the thickness of the intersection 30 with the address electrode 22 without increasing the thickness of the entire scan-side bus electrode 13a1.
[0073]
In the case of the present embodiment, the same operation and effect as those of the first embodiment can be obtained, and the material cost of the scan-side bus electrode 13a1 can be reduced. Further, as shown in FIG. 5, by making the thickness of the scan-side bus electrode 12a1 substantially equal to the thickness of the common-side bus electrode 12b in the vicinity of a portion intersecting with the partition wall 24, almost all of the partition walls 24 are formed. The top can be securely brought into close contact with the protective layer 15, and crosstalk can be reduced.
[0074]
Third embodiment
In the present embodiment, as shown in FIG. 6, a dielectric layer 32 is interposed between the first substrate 11 and the scan-side discharge sustaining electrode 12a to which the scan-side bus electrode 13a2 is connected, and the common-side bus electrode The dielectric layer 32 is not interposed between the first substrate 11 and the common-side sustain electrode 12b to which the electrode 13b is connected. As a result, the distance between the scan-side bus electrode 13a2 and the address electrode 22 that intersect with the discharge space 4 therebetween is smaller than the distance between the common-side bus electrode and the address electrode that intersect with the discharge space 4 interposed. Note that the dielectric layer 32 is integrated with the dielectric layer 14. The thickness of the dielectric layer 32 is equal to the thickness difference (t2−t1) shown in FIG. Other configurations of the present embodiment are the same as those of the first embodiment.
[0075]
In the present embodiment, the thickness t2 of the scan-side bus electrode 13a2 is not necessarily required to be larger than the thickness t2 of the common-side bus electrode 13b, and may be the same. With this configuration, as in the first embodiment, the discharge space can be reduced, the distance between the scan-side bus electrode and the address electrode can be shortened, and address discharge can be easily performed. Therefore, also in the present embodiment, a stable address discharge can be realized by reducing abnormal discharge at the time of addressing, and a plasma display device with high luminance and high contrast can be provided. Particularly, in the present embodiment, the same operation and effect as those of the first embodiment can be obtained only by interposing the dielectric layer 32 having a predetermined pattern, so that the manufacture thereof is easy.
[0076]
Fourth embodiment
As shown in FIG. 7, in the present embodiment, the width W2 of the scan-side bus electrode 13a3 that intersects the address electrode 22 across the discharge space 4 is wider than the width W1 of the common-side bus electrode 13b. The difference between these widths (W2−W1) is not particularly limited, but is preferably 1 to 100 μm. If the difference between these widths is small, the effect of this embodiment is small, and if the difference is too large, the width of the scan-side bus electrode 13a3 becomes too large or the width of the common-side bus electrode 13b becomes too small. There is a tendency. If the width of the scan-side bus electrode 13a3 is too large, the area for blocking light increases, which is not preferable. If the width of the common-side bus electrode 13b is too small, the line resistance of the common-side sustain electrode 12b cannot be reduced, which is not preferable. Other configurations of the present embodiment are the same as those of the first embodiment.
[0077]
In the present embodiment, by changing the width (thickness) of the scan-side bus electrode 13a3 instead of changing the thickness of the scan-side bus electrode, the area of the portion caused by the discharge can be increased, and the address electrode 22 can be increased. And the scan-side discharge sustaining electrode 13a3 can be easily discharged. Therefore, also in the present embodiment, a stable address discharge can be realized by reducing abnormal discharge at the time of addressing, and a plasma display device with high luminance and high contrast can be provided.
[0078]
Fifth embodiment
As shown in FIG. 8, in the present embodiment, the scan-side bus electrode 13a4 is wider than the width of the common-side bus electrode 13b only in the vicinity of the portion that intersects the address electrode 22 across the discharge space 4. . Other configurations of the present embodiment are the same as those of the first embodiment.
[0079]
In the present embodiment, only the necessary portion of the scan-side bus electrode 13a4 is wider than in the fourth embodiment, so that there is no waste of material. Furthermore, although the bus electrode 13a4 is made of a material that blocks light, the portion that blocks light can be minimized.
[0080]
Other embodiments
Note that the present invention is not limited to the above-described embodiments, and can be variously modified within the scope of the present invention.
For example, in the above-described embodiment, the three-electrode type plasma display device has a configuration in which the pair of sustain electrodes 12 a and 12 b are formed inside the first substrate 11 and the address electrodes 22 are formed on the second substrate 21. In this case, the projected images of the pair of sustain electrodes 12a and 12b extend in the first direction X in parallel with each other, and the projected images of the address electrodes 22 extend in the second direction Y. May be arranged so as to face each other as they intersect, but the present invention is not limited to such a configuration.
[0081]
Further, in the above-described embodiment, the reflection type plasma display device has been described. However, the present invention is not limited to the reflection type plasma display device, but can be applied to a transmission type plasma display device. In the transmission type plasma display device, since the light emission of the phosphor layer is observed through the second substrate, the conductive material constituting the sustain electrode may be transparent or opaque. Since it is provided on the upper side, it is advantageous that the address electrode is transparent in terms of brightness.
[0082]
Furthermore, in the above-described embodiment, the partition (rib) 24 extending substantially parallel to the address electrode 22 is formed in a stripe shape. However, the present invention is not limited to this, and the partition 24 (rib) may have a meandering structure. Alternatively, it may have another structure. Note that by making the partition wall 24 black, a so-called black matrix can be formed, and the display screen can have high contrast. As a method for making the partition walls black, a method of forming the partition walls using a color resist material colored black can be exemplified.
[0083]
【Example】
Hereinafter, the present invention will be described based on more detailed examples, but the present invention is not limited to these examples.
[0084]
Example 1
A three-electrode type plasma display device having the structure shown in FIGS. 1 to 3 was manufactured by the method described below.
[0085]
The first panel 10 was produced by the following method. First, an ITO layer is formed on the entire surface of the first substrate 11 made of high strain point glass or soda glass by, for example, a sputtering method, and the ITO layer is patterned into stripes by a photolithography technique and an etching technique. A plurality of sustain electrodes 12 were formed. The discharge sustaining electrode 12 extends in the first direction X. Next, an aluminum film was formed on the entire surface by, for example, a vapor deposition method, and the aluminum film was patterned by a photolithography technique and an etching technique, thereby forming bus electrodes 13 along the edges of the respective sustain electrodes 12. The thickness t2 of one scan-side bus electrode 13a of the bus electrodes 13 is 10 μm, the thickness t1 of the common-side bus electrode 13b is 5 μm, and the width of each of the bus electrodes 13a and 13b is 40 μm. there were.
[0086]
Then, the entire surface is SiO₂Was formed, and a protective film 15 made of magnesium oxide (MgO) having a thickness of 0.6 μm was formed thereon by electron beam evaporation. Through the above steps, the first panel 10 was completed.
[0087]
The second panel 20 was produced by the following method. First, an address electrode 22 was formed on a second substrate 21 made of high-strain point glass or soda glass by printing a silver paste in a stripe shape by, for example, a screen printing method, and performing baking. The address electrode 22 extends in a second direction Y orthogonal to the first direction X. Next, a low-melting glass paste layer was formed on the entire surface by screen printing, and the dielectric film 23 was formed by firing the low-melting glass paste layer. Thereafter, a low-melting glass paste was printed on the dielectric film 23 above the region between the adjacent address electrodes 22 by, for example, a screen printing method, and baked to form the partition walls 24. Next, the phosphor slurries of the three primary colors are sequentially printed and baked, so that the phosphor layers 25R, 25G, and 25B extend from the dielectric film 23 between the partition walls 24 to the side wall surfaces of the partition walls 24. Was formed. Through the above steps, the second panel 20 was completed.
[0088]
Next, the plasma display device was assembled. That is, first, a seal layer was formed on the peripheral portion of the second panel 20 by, for example, frit dispensing. Next, the first panel 10 and the second panel 20 were bonded and fired to cure the seal layer. Then, after evacuating the space formed between the first panel 10 and the second panel 20, the mixed gas was sealed, and the space was sealed, thus completing the plasma display device.
[0089]
Reference Example 1
For comparison, a plasma display device was manufactured in the same manner as in Example 1 except that the scan-side bus electrode and the common-side bus electrode had the same thickness. In the plasma display device, the distance from the scan-side bus electrode to the bus electrode was changed from 80 μm to 160 μm, and the relationship between the distance and the address voltage was examined. FIG. 9 shows the results. As shown in FIG. 9, it was found that the shorter the distance between the two electrodes, the lower the address voltage can be. Further, from FIG. 9, the address voltage can be reduced by shortening the distance between the electrodes, so that a stable discharge can be obtained, and the distance between the common-side bus electrode and the address electrode is reduced by the distance between the scan-side bus electrode and the address electrode. It can be seen that the longer distance than the distance of the above also has the effect of reducing abnormal discharge with the common-side bus electrode.
[0090]
Reference Example 2
FIG. 10 shows the result of examining the relationship between the height of the discharge space and the luminance in the plasma display device of Reference Example 1. As shown in FIG. 10, it can be seen that the higher the discharge space, the higher the screen brightness.
[0091]
Evaluation 1
Assuming Reference Example 1 and Reference Example 2, according to Example 1, among the scan-side discharge sustaining electrodes that affect the address discharge, the bus electrode closest to the address electrode is made thicker. The address discharge can be easily performed without making the discharge space narrow. Therefore, in the first embodiment, a stable address discharge can be realized by reducing abnormal discharge at the time of addressing, and a plasma display device with high brightness and high contrast can be provided.
[0092]
【The invention's effect】
As described above, according to the present invention, the discharge between the scan-side bus electrode and the address electrode is facilitated by making the address-side electrode and the scan-side bus electrode that actually performs the discharge thicker or thicker. In addition, a stable address discharge is realized by making the discharge of the common-side bus electrode and the address electrode less likely to occur. This makes it possible to reduce abnormal discharge during addressing, improve the black level, and achieve high contrast. In addition, by changing the thickness and width of the scan-side bus electrode, the discharge space can be maintained at a sufficient height, and high contrast can be obtained while achieving high luminance.
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view of a main part of a plasma display device according to an embodiment of the present invention.
FIG. 2 is a main part plan view showing a relationship among a partition, an address electrode, a sustain electrode, and a bus electrode shown in FIG. 1;
FIG. 3 is a schematic cross-sectional view of a main part taken along line III-III shown in FIG. 2;
FIG. 4 is a plan view of a main part showing a relationship among a partition, an address electrode, a sustain electrode, and a bus electrode in a plasma display device according to another embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of a main part along line VV in FIG. 4;
FIG. 6 is a schematic cross-sectional view of a main part, similar to FIG. 5, of a plasma display device according to still another embodiment of the present invention.
FIG. 7 is a plan view of a main part showing a relationship among a partition, an address electrode, a sustain electrode, and a bus electrode in a plasma display device according to still another embodiment of the present invention.
FIG. 8 is a plan view of a main part showing a relationship among barrier ribs, address electrodes, discharge sustaining electrodes, and bus electrodes in a plasma display device according to still another embodiment of the present invention.
FIG. 9 is a graph showing a relationship between a distance between a scan-side discharge sustain electrode and an address electrode and an address voltage.
FIG. 10 is a graph showing a relationship between discharge space height and luminance.
[Explanation of symbols]
2. Plasma display device
4. Discharge space
… Discharge cell
10 First panel
11 First substrate
12 ... Discharge sustaining electrode
12a: scan-side sustain electrode
12b ... Common side sustaining electrode
13 ... bus electrode
13a, 13a1, 13a2, 13a3, 13a4 ... scan-side bus electrodes
13b ... Common side bus electrode
14 ... Dielectric layer
15 ... Protective layer
20 ... 2nd panel
21 ... Second substrate
22 ... address electrode
24 ... Partition wall
25R, 25G, 25B ... Phosphor layer
32 ... dielectric layer
G: Discharge gap

Claims (9)

A first substrate;
A second substrate disposed opposite to the inside of the first substrate to form a sealed discharge space therebetween;
At least a pair of scan-side sustain electrodes and a common-side sustain electrode formed inside the first substrate and forming a discharge gap therebetween;
A scan-side bus electrode formed along the longitudinal direction of the scan-side sustain electrode;
A common-side bus electrode formed along the longitudinal direction of the common-side sustain electrode,
An address electrode formed inside the second substrate in a direction intersecting with the discharge sustaining electrode;
A plasma display device having
A plasma display device, wherein a thickness of at least a part of the scan-side bus electrode that intersects with the address electrode across the discharge space is larger than a thickness of the common-side bus electrode. 2. The plasma display device according to claim 1, wherein a thickness of the scan-side bus electrode is uniformly thicker in a longitudinal direction than a thickness of the common-side bus electrode. 3. 2. The plasma display device according to claim 1, wherein a thickness of the scan-side bus electrode is thicker than a thickness of the common-side bus electrode only at a portion near the intersection with the address electrode across the discharge space. 3. . The thickness of the scan-side bus electrode is greater than the thickness of the common-side bus electrode in the vicinity of a portion that intersects with the address electrode across the discharge space, and intersects with a partition wall that holds the height of the discharge space. 2. The plasma display device according to claim 1, wherein the thickness in the vicinity is substantially equal to the thickness of the common-side bus electrode. A first substrate;
A second substrate disposed opposite to the inside of the first substrate to form a sealed discharge space therebetween;
At least a pair of scan-side sustain electrodes and a common-side sustain electrode formed inside the first substrate and forming a discharge gap therebetween;
A scan-side bus electrode formed along the longitudinal direction of the scan-side sustain electrode;
A common-side bus electrode formed along the longitudinal direction of the common-side sustain electrode,
An address electrode formed inside the second substrate in a direction intersecting with the discharge sustaining electrode;
A plasma display device having
The distance between the scan-side bus electrode and the address electrode that intersects across the discharge space is smaller than the distance between the common-side bus electrode and the address electrode that intersects across the discharge space. A plasma display device, wherein a bus electrode is arranged inside the first substrate. A first substrate;
A second substrate disposed opposite to the inside of the first substrate to form a sealed discharge space therebetween;
At least a pair of scan-side sustain electrodes and a common-side sustain electrode formed inside the first substrate and forming a discharge gap therebetween;
A scan-side bus electrode formed along the longitudinal direction of the scan-side sustain electrode;
A common-side bus electrode formed along the longitudinal direction of the common-side sustain electrode,
An address electrode formed inside the second substrate in a direction intersecting with the discharge sustaining electrode;
A plasma display device having
A plasma display device, wherein a width of at least a part of the scan-side bus electrode intersecting with the address electrode across the discharge space is wider than a width of the common-side bus electrode. 7. The plasma display device according to claim 6, wherein the width of the scan-side bus electrode is uniformly wider in the longitudinal direction than the width of the common-side bus electrode. 7. The plasma display device according to claim 6, wherein the width of the scan-side bus electrode is larger than the width of the common-side bus electrode only in the vicinity of a portion that intersects with the address electrode across the discharge space. . 9. The plasma display device according to claim 1, wherein the discharge gap is less than 5 × 10 ⁻⁵ m.

Images