JP2003151442A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display device capable of enhancing image quality on a display screen and reducing noise and radiant noise caused by discharge, by preventing a discharge gas particle in a charged condition which serves as a priming particle from driving into an adjacent picture element, and by dissolving a tailing phenomenon and a flickering phenomenon on the display screen. SOLUTION: This plasma display device has a plurality of pairs of discharge maintaining electrodes 12 formed on the inside of a first base 11, and a barrier rib 24 formed on the inside of a second base 21 to form a sealed discharge space 4 between the first base 11 and the second base 21, and each pair of discharge electrodes 12 forms an electric field for plasma display so as to turn it toward a direction perpendicular to the wall surface of the barrier rib 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to improving the image quality on a display screen by optimizing the formation pattern of partition ribs and discharge sustain electrodes in the plasma display device. The present invention relates to a plasma display device capable of reducing noise and radiation noise due to erroneous discharge.

[0002]

2. Description of the Related Art Various flat panel display devices have been studied as an image display device to replace a cathode ray tube (CRT) which is currently the mainstream. A liquid crystal display device (LCD), an electroluminescence display device (ELD), and a plasma display device (PDP: plasma display) can be exemplified as such a flat display device. Among them, the plasma display device has advantages such as relatively easy enlargement of a screen and widening of a viewing angle, excellent resistance to environmental factors such as temperature, magnetism, and vibration, and long life, It is expected to be applied to large-scale information terminal devices for public use as well as household wall-mounted televisions.

In a plasma display device, a voltage is applied to a discharge cell in which a discharge gas composed of a rare gas is sealed in a discharge space, and ultraviolet rays generated by glow discharge in the discharge gas generate a phosphor layer in the discharge cell. It is a display device that emits light by exciting. That is, the individual discharge cells are driven by a principle similar to that of a fluorescent lamp, and the discharge cells are usually assembled on the order of hundreds of thousands to form one display screen. The plasma display device is a direct current drive type (DC type) or an alternating current drive type (AC type) depending on a method of applying a voltage to a discharge cell.
They are roughly divided into two types, each with advantages and disadvantages.

The AC type plasma display device is suitable for high definition because the rib ribs for partitioning the individual discharge cells in the display screen may be formed in stripes, for example. Moreover, since the surface of the electrode for discharging is covered with the dielectric layer, the electrode has advantages that it is hard to wear and has a long life.

In such a plasma display device, if the partition ribs are formed in a stripe shape, for example, the discharge sustaining electrodes extend in a direction perpendicular to the striped partition ribs. Therefore, the partition ribs are driven during sustain driving of the display device. The electric field for plasma discharge acts in a direction parallel to. Therefore, it is considered that the charged particles of the discharge gas atoms, which become priming in the direction parallel to the ribs of the partition wall, are accelerated and jump into adjacent pixels, which causes the tailing phenomenon on the display screen. In addition, since the amount of priming particles in the direction along the ribs of the partition wall changes, wall charges and the like are also affected and cause flicker on the screen.

For example, Xe of 10 kPa is used as the discharge gas.
In the case of a plasma display device having a stripe rib rib using gas, the electric field strength between electrodes when an applied voltage of about 200 V acts on an electrode gap of about 20 μm,
It reaches about 1 × 10 5 (V / m). The drift velocity of Xe in the charged state at that time is about 9 × 10 4 (m /
s) is also reached. The mean free path of Xe particles is about 0.1μ
Since it is m, the time for switching the direction of the electric field is 1
Assuming that the collision is 0 μsec and that there is no collision with other atoms, the Xe particles will move about 0.9 m within that time. In fact, before moving this distance, Xe
The particles collide with other atoms, carry out charge exchange, and repeat this collision many times.

As described above, the atoms in the charged state are exchanged, but the exchanged atoms jump in almost the same direction. It is considered that this causes the trailing phenomenon and the flicker phenomenon on the display screen.

It should be noted that, in order to secure a wide discharge area between the partition ribs, not to eliminate the tailing phenomenon and the flicker phenomenon on the display screen, Japanese Patent Laid-Open No. 11-
As shown in Japanese Patent No. 86739, there is known a plasma display device in which a part of the discharge sustaining electrode is formed in a pattern that is substantially parallel to the rib ribs.

However, the plasma display device disclosed in this publication does not form an electric field for plasma discharge that extends in a direction substantially perpendicular to the wall surface of the rib rib. Moreover, in the technique disclosed in this publication, although the discharge gap is too wide, there is a portion where the distance between the pair of adjacent discharge sustaining electrodes is too short, so that there is a possibility of erroneous discharge at the portion where the distance is short. Have a challenge. Since the acceleration direction of the charged particles due to the erroneous discharge is parallel to the partition ribs,
It has the same inconvenience as the prior art of the present invention.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to prevent discharge gas particles in a charged state, which are priming particles, from jumping into an adjacent pixel and display the same. It is an object of the present invention to provide a plasma display device capable of eliminating the trailing phenomenon and the flicker phenomenon on the screen, improving the image quality on the display screen, and reducing noise and radiation noise due to erroneous discharge.

[0011]

In order to achieve the above object, a plasma display device according to the present invention includes a plurality of pairs of discharge sustaining electrodes formed inside a first substrate and inside a second substrate. And a partition rib for forming a sealed discharge space between the first substrate and the second substrate, wherein each pair of the discharge sustaining electrodes is substantially parallel to a wall surface of the partition rib. It is characterized by having a pattern for forming an electric field for plasma discharge in the vertical direction.

According to the plasma display device of the present invention,
Each pair of discharge sustaining electrodes has a pattern for forming a plasma discharge electric field in a direction substantially perpendicular to the wall surface of the partition rib. Therefore, in the discharge space, the charged particles of the discharge gas are accelerated toward the wall surface of the partition rib, collide with the wall surface of the partition rib, and are discharged in a charged state to be priming particles to adjacent pixels along the partition rib. It is possible to prevent gas particles from jumping in. As a result, it is possible to eliminate the trailing phenomenon and the flicker phenomenon on the display screen, improve the image quality on the display screen, and reduce noise and radiation noise due to erroneous discharge.

In the present invention, the electrode pattern of the discharge sustaining electrode is not particularly limited, but preferably, each of the pair of discharge sustaining electrodes extends in a direction intersecting the longitudinal direction of the partition rib. An electrode portion, and a plurality of pairs of branch electrode portions branching from the main electrode portion, extending between the partition ribs substantially parallel to the longitudinal direction of the partition ribs, and each pair forming a discharge gap. And the discharge gap formed between the pair of branch electrode portions forms a plasma discharge electric field directed substantially perpendicular to the wall surface of the partition rib.

Since the electrode pattern of the discharge sustaining electrode has the main electrode portion and the branch electrode portion, it is easy to form an electric field for plasma discharge that extends in a direction substantially perpendicular to the wall surface of the rib rib.

Preferably, the interval of the discharge gap is
The distance is 1 / 1.5 or less of the insulation distance between the tip of the branch electrode portion and the main electrode portion to which another branch electrode having the discharge gap is connected to the branch electrode.

By setting the interval of the discharge gap to be less than 1 / 1.5 of the insulation interval, it is possible to surely perform the discharge between the discharge gaps and to ensure the erroneous discharge in the insulation interval. Can be prevented.

Preferably, the discharge sustaining electrodes are transparent electrodes, and a bus electrode having a resistance lower than that of the discharge sustaining electrodes is connected to each of the discharge sustaining electrodes, and the bus electrodes are main electrodes of the discharge sustaining electrodes. A bus main electrode portion extending along the longitudinal direction of the electrode portion and having a width narrower than the width of the main electrode portion; and a bus main electrode portion extending along the branch electrode portion of the discharge sustaining electrode and narrower than the width of the branch electrode portion. And a bus branch electrode portion having a width.

The discharge sustaining electrode is usually composed of a transparent electrode and has a high resistance value. In the present invention, by optimizing the pattern of the bus electrodes as described above, the electric field uniformly acts on the discharge gap in each pair of the discharge sustaining electrodes, and the formation of the potential gradient due to the high resistance value is suppressed. You can

Further, in the present invention, each of the pair of discharge sustaining electrodes is branched from the pair of bus main electrode portions and a pair of bus main electrode portions extending in a direction intersecting the longitudinal direction of the partition ribs. Between the partition ribs, a plurality of pairs of bus branch electrode portions that extend substantially parallel to the longitudinal direction of the partition ribs, and the pair of bus rib electrode portions that are located between the partition ribs and that face the partition ribs at a substantially right angle direction. A plurality of pairs of island-shaped electrode portions that are formed in a pattern to be connected to the bus branch electrode portions and that form a discharge gap between each pair, and are formed between the pair of island-shaped electrode portions. An electric field for plasma discharge may be formed by the discharge gap in a direction substantially perpendicular to the wall surface of the partition rib.

In this case, preferably, the bus main electrode portion and the bus branch electrode portion are made of metal electrodes, and the island-shaped electrode portion is made of a transparent electrode.

By arranging the transparent electrodes, which have a resistance value higher than that of the bus electrodes, in an island shape only in the minimum necessary portion, the electrostatic capacity as a capacitor formed between each pair of discharge sustaining electrodes is entirely. And the free discharge current is reduced, which is preferable.

In the present invention, preferably, a dielectric layer is formed inside the first substrate so as to cover the discharge sustaining electrodes. Further, according to the present invention, preferably, the inside of the second substrate is formed so as to intersect with each of the discharge gaps.
A plurality of address electrodes are formed substantially in parallel.

In the present invention, the effect of the present invention is particularly great when the partition ribs are formed in a stripe pattern.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the embodiments shown in the drawings. 1 is a schematic exploded perspective view of a main part of a plasma display device according to an embodiment of the present invention, and FIG.
II-II line sectional view of FIG. 3, FIG. 3 is a plan view showing the relationship between the rib ribs and the pattern of the discharge sustaining electrode, and FIG. 4 is the rib ribs and the discharge sustaining electrode according to another embodiment of the present invention. It is a top view which shows the relationship with a pattern.

(First Embodiment) Overall Configuration of Plasma Display Device First, referring to FIG. 1, the overall configuration of an AC drive type (AC) type plasma display device (hereinafter, may be simply referred to as a plasma display device). explain.

The AC type plasma display device 2 shown in FIG.
It belongs to a so-called three-electrode type, and discharge is generated between the pair of discharge sustaining electrodes 12. This AC type plasma display device 2 is formed by laminating a first panel 10 corresponding to a front panel and a second panel 20 corresponding to a rear panel. The light emission of the phosphor layers 25R, 25G, 25B on the second panel 20 is observed through the first panel 10. That is,
The first panel 10 is the display surface side.

The first panel 10 comprises a transparent first substrate 11
And a plurality of pairs of discharge sustaining electrodes 12 made of a transparent conductive material, which are provided in a stripe shape on the first substrate 11 substantially parallel to each other in the first direction X, and to reduce the impedance of the discharge sustaining electrodes 12. Provided on the discharge sustaining electrode 12
A bus electrode 13 made of a material having a lower electrical resistivity than
The dielectric layer 14 is formed on the first substrate 11 including the bus electrodes 13 and the discharge sustaining electrodes 12, and the protective layer 15 is formed thereon. The protective layer 1
5 does not necessarily have to be formed, but is preferably formed.

On the other hand, the second panel 20 includes a second substrate 21.
And a plurality of address electrodes (also referred to as data electrodes) 22 provided in stripes on the second substrate 21 along the second direction Y (substantially perpendicular to the first direction X) and substantially parallel to each other.
An insulator film 23 formed on the second substrate 21 including the address electrodes 22, an insulating partition rib 24 formed on the insulator film 23, and a partition rib 24 from the insulator film 23.
And a phosphor layer provided over the side wall surface of the. The phosphor layer is composed of a red phosphor layer 25R, a green phosphor layer 25G, and a blue phosphor layer 25B.

FIG. 1 is a partially exploded perspective view of the display device. Actually, as shown in FIG. 2, the top of the partition rib 24 on the second panel 20 side is in the third direction Z (first direction X). And in a direction orthogonal to the second direction Y), and abuts on the protective layer 15 on the first panel 10 side. Discharge gap W1 (see FIG. 3)
The region where the pair of discharge sustaining electrodes 12 for forming the electrodes and the address electrode 22 overlap corresponds to a single discharge cell. Then, a discharge gas is enclosed in the discharge space 4 surrounded by the barrier ribs 24 on which the phosphor layers 25R, 25G, 25B are formed and the protective layer 15. The first panel 10 and the second panel 20 have their peripheral portions,
It is joined using frit glass. The discharge gas sealed in the discharge space 4 is not particularly limited,
An inert gas such as xenon (Xe) gas, neon (Ne) gas, helium (He) gas, argon (Ar) gas, nitrogen (N ₂ ) gas, or a mixed gas of these inert gases is used. The total pressure of the enclosed discharge gas is not particularly limited, but is 6 × 10 ³ Pa to 8 × 10 ⁴
It is about Pa.

The direction in which the projected image of the discharge sustaining electrode 12 extends and the direction in which the projected image of the address electrode 22 extends are substantially orthogonal (though not necessarily orthogonal). As shown in FIG. 3, a pair of discharge sustaining electrodes 12 forming a discharge gap W1 and phosphor layers 25R, 25G, 2 emitting three primary colors.
An area where one set of 5B overlaps corresponds to one pixel (1 pixel). Since the glow discharge is generated between the pair of discharge sustaining electrodes 12 forming the discharge gap W1, this type of plasma display device is called a "surface discharge type". The driving method of this plasma display device will be described later.

The plasma display device 2 of the present embodiment is a so-called reflection type plasma display device, and includes a phosphor layer 25R,
Since the light emission of 25G and 25B is observed through the first panel 10, the conductive material forming the address electrode 22 may be transparent or opaque.
The conductive material forming 2 must be transparent. The transparency / opacity described here is based on the light transmittance of the conductive material in the emission wavelength (visible light region) peculiar 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 discharge sustaining electrodes and the address electrodes is transparent.

As the opaque conductive material, Ni, Al,
Au, Ag, Pd / Ag, Cr, Ta, Cu, Ba, L
Materials such as aB ₆ , Ca _0.2 La _0.8 CrO _{3 and the} like can be used alone or in combination. As a transparent conductive material, ITO (indium tin oxide)
And SnO ₂ . The discharge sustaining electrode 12 or the address electrode 22 can be formed by a sputtering method, a vapor deposition method, a screen printing method, a plating method, or the like.
Pattern processing is performed by a photolithography method, a sandblast method, a lift-off method, or the like.

The dielectric layer 14 formed on the surface of the discharge sustaining electrode 12 is composed of, for example, a single-layer silicon oxide layer, but may be a multilayer film. The dielectric layer 14 made of this silicon oxide layer 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 1 to 10 μm in this embodiment.

By providing the dielectric layer 14, the ions and electrons generated in the discharge space 4 are prevented from being discharged.
Direct contact with can be prevented. As a result, wear of the discharge sustaining electrode 12 can be prevented. The dielectric layer 14 has a memory function of accumulating wall charges generated in the address period and maintaining a discharge state, and a function of a resistor that limits an excessive discharge current.

The protective layer 15 formed on the surface of the dielectric layer 14 on the discharge space side has a function 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 sustaining electrode 12 and the dielectric layer 14 can be effectively prevented. In addition, the protective layer 15
Also has a function of emitting secondary electrons necessary for discharging. As a material forming the protective layer 15, magnesium oxide (M
Examples thereof include gO), magnesium fluoride (MgF ₂ ), and calcium fluoride (CaF ₂ ). Among them, magnesium oxide is a suitable material having features such as chemical stability, a low sputtering rate, a high light transmittance at the emission wavelength of the phosphor layer, and a low discharge starting voltage. The protective layer 15 may have a laminated film structure composed of at least two kinds of materials selected from the group consisting of these materials.

As a constituent material of the first substrate 11 and the second substrate 21, high strain point glass and soda glass (Na ₂ O.C) are used.
aO ・ SiO ₂ ), borosilicate glass (Na ₂ O ・ B ₂ O ₃
・ SiO ₂ ), forsterite (2MgO ・ Si
O _2), can be exemplified lead glass _{(Na 2 O · PbO · SiO} 2). The constituent materials of the first substrate 11 and the second substrate 21 may be the same or different, but it is desirable that they have the same coefficient of thermal expansion.

The phosphor layers 25R, 25G and 25B are, for example, phosphors selected from the group consisting of a phosphor layer material emitting red light, a phosphor layer material emitting green light and a phosphor layer material emitting blue light. It is made of a layer material and is provided above the address electrode 22. When the plasma display device is a color display, specifically, for example, a phosphor layer (red phosphor layer 25R) made of a phosphor layer material that emits red light is provided above the address electrode 22 to display a green color. A phosphor layer (green phosphor layer 25G) composed of a phosphor layer material that emits light is provided above another address electrode 22, and a phosphor layer composed of a phosphor layer material that emits blue light (blue phosphor). Body layer 25B) is further address electrode 2
2 is provided above, and one set of phosphor layers that emit these three primary colors is provided in a predetermined order. Then, as described above, the pair of discharge sustaining electrodes 1
2 and a set of phosphor layers 25 that emit these three primary colors
An area where R, 25G, and 25B overlap corresponds to one pixel P1.

As the phosphor layer material forming the phosphor layers 25R, 25G, 25B, a phosphor layer material having high quantum efficiency and low saturation with respect to vacuum ultraviolet rays is appropriately selected from conventionally known phosphor layer materials. Can be used. In the case of color display, the color purity is close to the three primary colors specified by NTSC, the white balance is good when the three primary colors are mixed, the afterglow time is short, and the afterglow times of the three primary colors are almost equal. It is preferred to combine the layer materials.

Specific examples of the phosphor layer material are shown below.
For example, as a phosphor layer material that emits red light, (Y_TwoO
_Three: Eu), (YBO_ThreeEu), (YVO_Four: Eu),
(Y _0.96P_0.60V_0.40O_Four: E
u_0.04), [(Y, Gd) BO_Three: Eu], (Gd
BO_Three: Eu), (ScBO_Three: Eu), (3.5Mg
O ・ 0.5MgF_Two・ GeO_Two: Mn), emits green light
As a phosphor layer material for_Two: Mn), (B
aA1₁₂O₁₉: Mn), (BaMg_TwoA1₁₆O
₂₇: Mn), (MgGa_TwoO_Four: Mn), (YB
O_Three: Tb), (LuBO_Three: Tb), (Sr_FourSi_Three
O₈Cl_Four: Eu), as a phosphor layer material that emits blue light
, (Y_TwoSiO₅: Ce), (CaWO_Four: Pb),
CaWO_Four, YP_0.85V_0.15O_Four, (BaMg
A1₁₄O₂₃: Eu), (Sr_TwoP_TwoO₇: Eu),
(Sr_TwoP_TwoO₇: Sn) and the like.

As a method of forming the phosphor layers 25R, 25G, 25B, a thick film printing method, a method of spraying phosphor layer particles, an adhesive substance is previously attached to the site where the phosphor layer is to be formed, and the phosphor layer is formed. A method of attaching particles, a method of using a photosensitive phosphor layer paste, patterning the phosphor layer by exposure and development, and a method of forming a phosphor layer on the entire surface and then removing unnecessary portions by sandblasting You can

The phosphor layers 25R, 25G, 25B may be directly formed on the address electrode 22, or
It may be formed over the address electrode 22 and the side wall surface of the partition rib 24. Alternatively, the phosphor layer 25
R, 25G, and 25B may be formed on the insulator film 23 provided on the address electrode 22, or the rib rib 2 may be formed on the insulator film 23 provided on the address electrode 22.
It may be formed over the side wall surface of No. 4. Furthermore,
The phosphor layers 25R, 25G, 25B may be formed only on the side wall surfaces of the partition ribs 24. Examples of the constituent material of the insulator film 23 include low melting point glass and SiO ₂ .

In the present embodiment, as shown in FIG. 3, each pair of discharge sustaining electrodes 12 and 12 extends in a direction X which intersects the longitudinal direction Y of the partition rib 24 at a substantially right angle. 12a. Each pair of main electrode portions 12
Between a plurality of partition ribs 24, a plurality of pairs of branch electrode portions 12b extending substantially parallel to the longitudinal direction of the partition ribs 24 and forming a discharge gap W1 are integrally formed in a. The discharge gap W1 formed between each pair of branch electrode portions 12b forms a plasma discharge electric field that extends in a direction substantially perpendicular to the wall surface of the rib rib 24.

Since each discharge sustaining electrode 12 is made of a transparent electrode and has a relatively high resistance, each discharge sustaining electrode 1 is
2, the bus electrodes 13 are formed in a pattern similar to the pattern of each discharge sustaining electrode 12. That is, each bus electrode 13 extends along the longitudinal direction of the main electrode portion 12a of the discharge sustaining electrode 12 and has a width narrower than the width of the main electrode portion 12a, and a branch of the discharge sustaining electrode 12. The bus branch electrode portion 13a extends along the electrode portion 12a and has a width narrower than that of the branch electrode portion 12a.

The discharge gap W1 between the pair of branch electrode portions 12b of the discharge sustaining electrode 12 is not particularly limited, but is preferably 1 to 150 μm, more preferably 5 μm.
˜50 μm, and more preferably 5 to 40 μm. In addition, the insulation gap W2 between the tip of the branch electrode portion 12b and the main electrode portion 12a to which another branch electrode portion 12b having the discharge gap W1 formed for the branch electrode portion 12b is connected is the discharge gap W1. The interval is 1.5 times larger than that. The protrusion length W3 of the branch electrode portion 12b is preferably 50 to 300 μm, and more preferably 100 to 20.
It is 0 μm.

The width W4 of the main electrode portion 12a is not particularly limited, but is about 70 to 250 μm. The width W5 of the branch electrode portion 12b is preferably 20 to 120 μm, more preferably 40 to 100 μm. Further, the width W6 of the bus main electrode portion 13a in the bus electrode 13 is preferably 20 to 100% with respect to the width W4 of the main electrode portion 12a.
The width W7 of the bus branch electrode portion 13b is 20 to 100% of the width W5 of the branch electrode portion 12b. Then, as shown in FIG. 2, the distance W8 between the discharge sustaining electrodes 12 between the pixels adjacent in the Y direction is such that erroneous discharge can be prevented, and is preferably about 100 to 250 μm. The width of the address electrode 22 shown in FIG.
For example, it is about 50 to 100 μm.

The bus electrode 13 is typically a metallic material,
For example, Ag, Au, Al, Ni, Cu, Mo, Cr
It can be composed of a single layer metal film such as or a laminated film of Cr / Cu / Cr or the like. In the reflection type plasma display device, the bus electrode 13 made of such a metal material reduces the amount of visible light that is emitted from the phosphor layer and passes through the first substrate 11 to reduce the brightness of the display screen. Therefore, it is preferable to form the discharge sustaining electrode as thinly as possible within the range in which the required electric resistance value can be obtained. The bus electrode 13 is the discharge sustaining electrode 1
It can be formed by the same method as described in 2.

As the constituent material of the partition rib 24, a conventionally known insulating material can be used, and for example, a widely used low melting glass mixed with a metal oxide such as alumina can be used. The height of the partition rib 24 is about 50 to 200 μm. The pitch interval between the partition ribs 24 is, for example, about 50 to 400 μm.

A discharge gas composed of a mixed gas is enclosed in the discharge space surrounded by the rib ribs 24.
The phosphor layers 25R, 25G, 25B emit light by being irradiated with ultraviolet rays generated based on the AC glow discharge generated in the discharge gas in the discharge space 4.

Manufacturing Method of Plasma Display Device Next, a manufacturing method of 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 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 to maintain a pair of discharges. A plurality of electrodes 12 are formed. The main electrode portion 12a of the discharge sustaining electrode 12 extends in the first direction X.

Next, an aluminum film is formed on the entire inner surface of the first substrate 11 by, for example, a vapor deposition method, and the aluminum film is patterned by a photolithography technique and an etching technique, whereby each discharge sustaining electrode 12 is formed.
The bus electrodes 13 are formed along the edges of the. Then, a dielectric layer 14 made of a silicon oxide (SiO ₂ ) layer is formed on the entire inner surface of the first substrate 11 on which the bus electrode 13 is formed.

In the present embodiment, the method for forming the dielectric layer 14 is not particularly limited, and an electron beam evaporation method, a sputtering method, an evaporation method, a screen printing method, etc. are exemplified. next,
On the dielectric layer 14, a 0.6 μm thick magnesium oxide (M
A protective layer 15 made of gO) is formed. The first panel 10 can be completed through the above steps.

The second panel 20 is manufactured by the following method. First, the second made of high strain point glass and soda glass
An address electrode 22 is formed by forming an aluminum film on the substrate 21 of, for example, by a vapor deposition method and patterning it by a photolithography technique and an etching technique. The address electrode 22 extends in a second direction Y that is orthogonal to the first direction X. Next, a low melting point glass paste layer is formed on the entire surface by screen printing, and the low melting point glass paste layer is baked to form the insulator film 23.

Then, partition ribs 24 are formed on the insulating film 23 so as to form a stripe pattern. The forming method at this time is not particularly limited, and examples thereof include a screen printing method, a sandblast method, a dry film method, and a photosensitive method. The dry film method is to laminate a photosensitive film on a substrate, remove the photosensitive film at the partition rib formation planned site by exposure and development, embed the partition rib forming material in the opening created by the removal, and burn. Is the way to do it. The photosensitive film is burned and removed by firing, and the partition rib forming material embedded in the openings remains to form partition ribs 24. The photosensitive method is a method in which a material layer for forming partition ribs having photosensitivity is formed on a substrate, the material layer is patterned by exposure and development, and then firing is performed. The firing (partition rib firing step) is performed in air at a firing temperature of 560 ° C.
It is a degree. The firing time is about 2 hours.

Next, the phosphor layer slurries of the three primary colors are sequentially printed between the partition ribs 24 formed on the second substrate 21.
Then, the second substrate 21 is baked in a baking furnace to form the phosphor layers 25R, 25G, 25B on the insulating film between the partition ribs 24 and on the side wall surfaces of the partition ribs 24. The firing temperature at that time (fluorescent substance firing step) is 510 °.
It is about C. The firing time is about 10 minutes.

Next, the plasma display device is assembled. That is, first, for example, by screen printing, the second
A sealing layer is formed on the peripheral portion of the panel 20. Then the first
The panel 10 and the second panel 20 are bonded together and fired to cure the seal layer. After that, the first panel 10 and the second
After the space formed between the panel 20 and the panel 20 is exhausted, a discharge gas is filled in and the space is sealed to complete the plasma display device 2.

An example of the AC glow discharge operation of the plasma display device having such a configuration will be described. First, for example,
A panel voltage higher than the discharge start voltage Vbd is applied to all one of the pair of sustain electrodes 12 for a short time. This causes glow discharge, wall charges are accumulated on the surface of the dielectric layer 14 in the vicinity of both the discharge sustaining electrodes 12, and the apparent discharge starting voltage is lowered. Then, the address electrode 22
One of the pair of sustaining electrodes included in the discharge cell that does not display while applying a voltage to the sustaining electrode 1
By applying a voltage to 2, the glow discharge is caused between the address electrode 22 and the one discharge sustaining electrode 12 to erase the accumulated wall charges. This erase discharge is sequentially executed at each address electrode 22. On the other hand, no voltage is applied to one of the sustain electrodes included in the discharge cell for displaying. This maintains the accumulation of wall charges. After that, all the pair of discharge sustaining electrodes 12
By applying a predetermined pulse voltage between the pair of discharge sustaining electrodes 1 in the cell in which the wall charges are accumulated.
In the discharge cell, the glow discharge is started between the two, and the phosphor layer excited by the irradiation of the vacuum ultraviolet ray generated based on the glow discharge in the discharge gas in the discharge space is a kind of the phosphor layer material. It emits a unique emission color. Note that the phases of the discharge sustaining voltages applied to one of the pair of discharge sustaining electrodes and the other of the pair of discharge sustaining electrodes are shifted by a half cycle, and the polarities of the electrodes are inverted according to the AC frequency.

In the plasma display device 2 of this embodiment, as described above, each pair of discharge sustaining electrodes 12 forms a pattern for forming a plasma discharge electric field in a direction substantially perpendicular to the wall 24 surface of the rib rib. have. Therefore, the discharge space 4
Then, the charged particles of the discharge gas are accelerated toward the wall surface of the partition rib 24, collide with the wall surface of the partition rib 24, and serve as priming particles for pixels adjacent to the partition rib 24. Can be prevented from jumping in. As a result, it is possible to eliminate the trailing phenomenon and the flicker phenomenon on the display screen, improve the image quality on the display screen, and reduce noise and radiation noise due to erroneous discharge.

Particularly in the present embodiment, by setting the interval of the discharge gap W1 to be 1 / 1.5 or less of the insulation interval W2, it is possible to surely perform the discharge between the discharge gaps W1 and the insulation. It is possible to reliably prevent erroneous discharge at the interval W2.

Further, in this embodiment, by optimizing the pattern of the bus electrodes 13 as described above, the electric field uniformly acts on the discharge gap W1 in each pair of the discharge sustaining electrodes 12, and the resistance value is high. It is possible to suppress the formation of a potential gradient due to.

(Second Embodiment) The plasma display device according to the present embodiment is a modification of the plasma display device 2 shown in FIGS. 1 to 3, and as shown in FIG. Is different. In the following description, parts common to the first embodiment will be denoted by common reference numerals in the drawings, description of common parts will be omitted, and only differences will be described in detail.

As shown in FIG. 4, each pair of discharge sustaining electrodes has a pair of bus main electrode portions 13a extending in a direction X intersecting at a right angle to the longitudinal direction Y of the rib rib 24, and a bus main electrode portion. 13 a, each of which has a pair of bus branch electrode portions 13 b extending between the partition ribs 24 substantially parallel to the longitudinal direction Y of the partition ribs 24. The pair of bus branch electrode portions 13b located between the partition ribs 24 and facing the partition ribs 24 in the direction X at a substantially right angle are connected to island-shaped electrode portions 12c forming a discharge gap W1 between each pair of bus branch electrode portions 13b. There is. The island-shaped electrode portion 12c is formed of a transparent electrode, and the discharge gap W1 formed between each pair of island-shaped electrode portions 12c causes plasma discharge to proceed in a direction substantially perpendicular to the wall surface of the rib rib 24. An electric field is formed.

Also in this embodiment, the same operational effects as those of the first embodiment are obtained, and the following operational effects are also exhibited. That is, in this embodiment, the transparent electrode 1 whose resistance value is higher than that of the bus electrode 13 only in the minimum necessary portion.
By arranging 2c in an island shape, the capacitance as a capacitor formed between each pair of discharge sustaining electrodes is reduced as a whole, and the free discharge current is reduced, which is more preferable.

(Other Embodiments) The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention. For example, in the present invention, the specific structure of the plasma display device is not limited to the embodiment shown in FIG. 1, and other structures may be used.
For example, the shape of the partition rib does not necessarily have to be a stripe shape, and may be another shape.

[0064]

As described above, according to the present invention, it is possible to prevent the discharge gas particles in the charged state, which are the priming particles, from jumping into the adjacent pixels, and to eliminate the tailing phenomenon and the flicker phenomenon on the display screen. It is possible to provide a plasma display device capable of improving image quality on a display screen and reducing noise and radiation noise due to erroneous discharge.

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of essential parts of a plasma display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts taken along the line II-II in FIG.

FIG. 3 is a plan view showing the relationship between partition ribs and patterns of discharge sustaining electrodes.

FIG. 4 is a plan view showing a relationship between partition ribs and patterns of discharge sustaining electrodes according to another embodiment of the present invention.

[Explanation of symbols]

2 ... Plasma display device 4 ... Discharge space 10 ... First panel 11 ... First substrate 12 ... Discharge sustaining electrode 12a ... Main electrode portion 12b ... Branch electrode portion 12c ... Island-shaped electrode portion 13 ... Bus electrode 13a ... Bus main electrode portion 13b ... Bus branch electrode portion 14 ... Dielectric layer 15 ... Protective layer 20 ... Second panel 21 ... Second substrate 22 ... Address electrode 23 ... Insulator film 24 ... Partition rib 25R, 25G, 25B ... Phosphor layer W1 ... Discharge gap

Continued front page    F-term (reference) 5C040 FA01 GB03 GC02 GC05 GC06                       GC20 GF02 LA05 LA14 MA08                       MA20

Claims (9)

[Claims] 1. A plurality of pairs of discharge sustaining electrodes formed inside a first substrate, and a sealed discharge space formed inside the second substrate between the first substrate and the second substrate. A partition rib for forming the plasma, wherein each pair of the discharge sustaining electrodes has a pattern for forming a plasma discharge electric field in a direction substantially perpendicular to a wall surface of the partition rib. Display device. 2. The pair of discharge sustaining electrodes, a pair of main electrode portions extending in a direction intersecting the longitudinal direction of the partition ribs, and a branch from the main electrode portion, between the partition ribs. A plurality of pairs of branch electrode portions, each pair extending substantially parallel to the longitudinal direction of the partition rib, each pair forming a discharge gap, and being formed between the pair of branch electrode portions. The plasma display device according to claim 1, wherein the discharge gap forms an electric field for plasma discharge that extends in a direction substantially perpendicular to a wall surface of the rib rib. 3. The gap of the discharge gap is an insulation between the tip of the branch electrode part and a main electrode part to which another branch electrode part where the discharge gap is formed is connected to the branch electrode part. The plasma display device according to claim 2, wherein the interval is 1 / 1.5 or less of the interval. 4. The discharge sustaining electrode is formed of a transparent electrode, and a bus electrode having a resistance lower than that of the discharge sustaining electrode is connected to each discharge sustaining electrode, and the bus electrode is a main electrode of the discharge sustaining electrode. A bus main electrode portion extending along the longitudinal direction of the portion and having a width narrower than the width of the main electrode portion; and a width extending along the branch electrode portion of the discharge sustaining electrode and narrower than the width of the branch electrode portion. 4. The plasma display device according to claim 2, further comprising a bus branch electrode portion having a. 5. The pair of discharge sustaining electrodes comprises a pair of bus main electrode portions extending in a direction intersecting a longitudinal direction of the rib ribs, and a branch from the bus main electrode portion to form a rib of the rib ribs. A plurality of pairs of bus branch electrode portions that extend substantially parallel to the longitudinal direction of the partition ribs, and a pair of bus branch electrode portions that are located between the partition ribs and that face the partition ribs at a substantially right angle. And a plurality of pairs of island-shaped electrode portions forming a discharge gap between each pair, and the discharge gap formed between the island-shaped electrode portions of each pair. The plasma display device according to claim 1, wherein a plasma discharge electric field is formed in a direction substantially perpendicular to a wall surface of the partition rib. 6. The plasma display device according to claim 5, wherein the bus main electrode portion and the bus branch electrode portion are made of metal electrodes, and the island-shaped electrode portion is made of a transparent electrode. 7. The first electrode covers the discharge sustaining electrode.
The plasma display device according to claim 1, wherein a dielectric layer is formed inside the substrate. 8. The plasma display device according to claim 2, wherein a plurality of address electrodes are formed substantially parallel to each other inside the second substrate so as to intersect the discharge gaps. . 9. The plasma display device according to claim 1, wherein the partition ribs are formed in a stripe pattern.