JPH11149261A - Color plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control interaction between a color filter layer and a metal electrode, and to conduct stable driving over a whole panel area. SOLUTION: A structure of a front substrate 1 has a tansparent electrode 2, a bus electrode 3, color filter layers 4R, 4G, 4B, a transparent dielectric layer 5, and a protection layer 6. The color filter layers 4R, 4G, 4B are formed not to be overlapped to the bus electrode 3, and are formed to contact with the transparent electrode 2 and a glass substrate, or formed inside the transparent dielectric layer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color plasma display panel used for an information display terminal, a flat panel television, and the like, and particularly to a color plasma display panel having a panel structure with high contrast and good color reproducibility.

[0002]

2. Description of the Related Art A color plasma display panel (hereinafter referred to as a color PDP) is a display in which a phosphor is excited and emitted by ultraviolet rays generated by gas discharge to perform a display operation. Discharge can be classified into an AC (AC) type and a DC (DC) type. Among them, the AC type is superior to the DC type in terms of luminance, luminous efficiency and life.

FIG. 7 shows a conventional reflective AC surface discharge color PD.
An example of P is shown in a perspective view, FIG. 8 is a cross-sectional view taken along line XX in FIG. 7, and FIG. 9 shows a state as viewed from the display surface.

Referring to FIGS. 7 to 9, a plurality of stripe-shaped transparent electrodes 2 are provided on a front substrate 1 of a transparent glass plate.
To form In FIG. 8, a plurality of these transparent electrodes 2 are formed in a direction perpendicular to the paper surface. A display operation is performed by applying a pulse AC voltage of several tens kHz to several hundred kHz between the adjacent transparent electrodes 2 to generate a discharge.

In the reflection type AC surface discharge color PDP, tin oxide (SnO ₂ ) or indium tin oxide (ITO) is applied to the transparent electrode 2 so that light emission from the phosphor is not interrupted.
A transparent conductive film such as that described above is usually used by forming a film using a thin film technique such as a sputtering method.

However, the sheet resistance of these transparent conductive films is high, and the electrode resistance of a large-sized panel or a high-definition panel becomes several tens of kΩ or more, and the applied voltage pulse does not sufficiently rise or a voltage drop occurs to drive. It becomes difficult. Therefore, a bus electrode 3 made of a metal thin film such as a multilayer thin film of chromium / copper / chrome or an aluminum thin film, or a metal thick film using a silver paste is formed on the transparent electrode 2 to reduce the resistance value of the transparent electrode 2 and the transparent electrode 2. A surface discharge electrode group 2H including the bus electrodes 3 is employed.

On the surface discharge electrode group 2H, color filter layers 4R, 4G, and 4B composed of stripe-like pigment fine powder layers are formed so as to be orthogonal to the surface discharge electrode group 2H. Generally, the color filter layers 4R, 4G, 4B
A material having an optical property of transmitting only the emission colors of the opposing phosphors (phosphor layers) 9R, 9G, and 9B is selected. Further, the color filter layers 4R, 4G, 4B are covered with a transparent dielectric layer 5. This transparent dielectric layer 5 is made of AC
It has a current limiting function peculiar to the type plasma display. The surface discharge between the two surface discharge electrode groups 2H is generated by the voltage applied to the surface discharge electrode group 2H, and the electric charge is stored in the transparent dielectric layer 5 by this discharge. This function stops the discharge when the sum of the voltage and the voltage due to the charge of the transparent dielectric layer 5 falls below the sustaining voltage.

In order to ensure dielectric strength and ease of manufacture, the transparent dielectric layer 5 is usually applied by a thick-film printing method using a paste mainly composed of low-melting glass, and is heated to a temperature higher than the softening point. To form a smooth layer having a thickness of about 20 to 40 microns without bubbles or the like.

Next, the protective layer 6 formed so as to cover the whole of the transparent dielectric layer 5 is made of a MgO thin film formed by a vapor deposition method or a sputtering method or an MgO film formed by a printing method or a spray method. It is. The film thickness is about 0.5 to 1 micron. The role of the protective layer 6 is to reduce discharge voltage and prevent surface spatter.

On the other hand, a stripe-shaped data electrode 8 for writing display data is formed on the rear substrate 10. FIG.
5, the data electrode 8 extends in a direction parallel to the paper. The data electrode 8 is orthogonal to the surface discharge electrode group 2H formed on the front substrate 1 and does not overlap with the data electrode 8.
In addition, the partition walls 7 are generally formed by thick film printing in parallel with the data electrodes 8. Further, the partition walls 7 have an effect of preventing erroneous discharge and optical crosstalk between the adjacent discharge cells 11. This partition is not shown at 8.

Further, phosphors 9 corresponding to red, green and blue emission colors are provided so as to cover the side surfaces of the partition walls 7 and the data electrodes.
R, 9G and 9B are applied three times for each color. Each of the phosphors 9R, 9G, and 9B is also formed on the side surface of the partition wall 7 in order to increase the application area of the phosphor and obtain high luminance. Normally, screen printing is used to form the phosphors 9R, 9G, and 9B.

Thereafter, the surface discharge electrode group 2H of the front substrate 1 and the data electrode 8 of the rear substrate 10 are opposed to each other via a partition so as to be orthogonal to each other, and the periphery thereof is hermetically sealed.
A dischargeable gas, for example, a mixed gas of He, Ne, and Xe is sealed in the inside of the chamber 1 at a pressure of about 500 torr.

In each discharge cell 11, two surface discharge electrode groups 2H each including a transparent electrode 2 and a bus electrode 3 are arranged, and a surface discharge is generated in a gap portion of the surface discharge electrode group 2H, and each discharge cell 11 Plasma is generated. The phosphors 9R, 9G, and 9B are excited by ultraviolet light generated at this time to generate red, green, and blue visible lights, and the color filter layer 4 of the front substrate 1 is formed.
Display light emission is obtained through R, 4G, and 4B.

A pair of adjacent surface discharge electrode groups 2H for generating a surface discharge serve as scan electrodes and sustain electrodes, respectively. In actual panel driving, a sustain pulse is applied between the scan electrode and the sustain electrode. When a write discharge is generated, a voltage is applied between the scan electrode and the data electrode 8 to generate a counter discharge, and a sustain pulse is generated between the surface discharge electrode group 2H by a sustain pulse continuously applied. I do.

Next, FIG. 10 is a cross-sectional view of the reflection type AC facing discharge color PDP, and FIG. 11 is a view when viewed from the display surface side. A plurality of stripe-shaped X electrodes 12 are formed on a transparent glass front substrate 1. In FIG. 10, a plurality of X electrodes 12 are formed in a direction perpendicular to the paper surface. Also, a plurality of stripe-shaped Y
The electrode 15 is formed.

In FIG. 10, a plurality of Y electrodes 15 are formed in a direction parallel to the paper surface. By covering the X electrode 12 and the Y electrode 15 with a dielectric layer, respectively, a capacitor characteristic of an AC type color PDP is formed, and several tens kHz to several hundred kHz are provided between the X electrode 12 and the Y electrode 15.
To generate a discharge to perform a display operation. The function of the capacitor formed by the X electrode 12, the Y electrode 15, and the respective dielectric layers is the same as that of the surface discharge type.

In the reflection type AC facing discharge color PDP, first, an X electrode 12 is formed on the front substrate 1. X electrode 12
Need to be formed thin so that light emission from the phosphors 9R, 9G, 9B is not blocked. However, when the electrode is made thinner, the resistance value increases. Therefore, it is necessary to use a metal electrode having a low resistance. Therefore, the X electrode 12 is formed using a metal thin film such as a multilayer thin film of chromium / copper / chrome or an aluminum thin film, or a metal thick film using a silver paste.

Next, a black mask 13 is formed. The black mask 13 is perpendicular to the plane of FIG.
It is formed between the electrodes 12 in parallel with the X electrodes 12. The black mask 13 is formed on the front substrate 1 side for the purpose of preventing a decrease in contrast due to the white body color of the partition walls 7 and the phosphors 9R, 9G, 9B formed on the rear substrate 10 side. As a forming method, there are a direct patterning by a thick film printing method, a method of applying a solid pattern using a photosensitive paste on a substrate, and then performing exposure and development to perform patterning.

The color filter layers 4R, 4G, 4B are formed in stripes between the black masks 13. Generally, for the color filter layers 4R, 4G, 4B, a material having an optical property of transmitting only the emission color of the opposing phosphors 9R, 9G, 9B is selected. Further, a transparent dielectric layer 5 and a protective layer 6 are formed on the color filter layer 4, but the formation purpose and the formation method are the same as in the case of the AC surface discharge color PDP, and a description thereof will be omitted.

On the other hand, a Y electrode 15 is formed on the rear substrate 10 so as to be orthogonal to the X electrode 12 formed on the front substrate 1. In FIG. 10, the Y electrode 15 extends in a direction parallel to the paper surface. The method for forming the Y electrode 15 is similar to the method for forming the X electrode 12. The dielectric layer 14 is formed on the Y electrode 15. Unlike the transparent dielectric layer 5 formed on the front substrate 1, the dielectric layer 14 does not necessarily need to be transparent.
Rather, in order to efficiently reflect the light emitted from the phosphors 9R, 9G, and 9B toward the front substrate 1, it is desirable that the phosphor be white. Like the transparent dielectric layer 5, the dielectric layer 14 is applied by a method such as a thick-film printing method using a paste mainly composed of low-melting glass, and is fired at a high temperature equal to or higher than the softening point. Then, a smooth layer having a thickness of about 15 to 30 microns and containing no air bubbles or the like is formed.

A protective layer 16 is formed on the dielectric layer 14 in a stripe shape and in a direction perpendicular to the Y electrodes 15. In FIG. 10, a plurality of protective layers 16 are formed perpendicular to the paper surface. The protective layer 16 provided on the rear substrate 10 has the same function as the protective layer 6 provided on the front substrate 1.
In the case of the opposed discharge type, since all discharges occur between the front substrate 1 and the rear substrate 10, it is necessary to form the protective layer 16 also on the rear substrate 10 side.

Next, the partition 7 is formed between the protective layers 16 on the dielectric layer 14. The partition 7 is formed orthogonal to the Y electrode 14 and parallel to the protective layer 16. That is, in FIG.
Are formed as a plurality of stripes perpendicular to the paper surface. In the case of the surface discharge color PDP, the discharge occurs between the surface discharge electrode groups 2H in FIG. 8, while in the case of the opposed discharge type, the X on the front substrate 1 in FIG. The electrode 12 and the Y electrode 15 on the rear substrate 10. In the discharge, the discharge starting voltage, the discharge sustaining voltage, and the like vary greatly depending on the discharge gap. Therefore, in the case of the surface discharge type, the distance between the adjacent transparent electrodes 2 is very important. Becomes important. Therefore, as a method of forming the partition wall 7, a method of forming by a multilayer thick film printing method or a method of a sandblast method can be considered.

Next, the partition 7 and the front substrate 1 and the rear substrate 10
The phosphors 9R, 9G, and 9B corresponding to the red, green, and blue light emission colors are applied to the discharge cells 17 composed of three times for each color. Each phosphor is also formed on the side surface of the partition wall 7 in order to increase the phosphor application area and obtain high luminance. Normally, screen printing is used to form the phosphors 9R, 9G, and 9B. When forming the phosphors 9R, 9G, 9B,
The phosphors 9R, 9G, 9B must not cover the protective layer 16 formed between the partition walls 7.

Thereafter, the X electrode 12 of the front substrate 1 and the Y electrode 15 of the rear substrate 10 are opposed to each other via a partition so as to be orthogonal to each other, hermetically sealed around, and capable of discharging inside the discharge cells 17. Fill the gas.

Each of the phosphors 9R used in the color PDP,
The body colors of 9G and 9B are usually white powders having a very high reflectance. In a color PDP, when indoor or outdoor light (external light) is incident on the panel, the external light is absorbed by the upper part of the partition wall or the bus electrode portion. However, about 30% to 50% of the light is reflected, and therefore, the contrast is remarkable. Be impaired.
There is a method of disposing an ND filter having a transmittance of about 40 to 80% on the panel surface to prevent the reflection of external light and obtain a display with good contrast. There is a disadvantage that the luminance of the color PDP is reduced due to the partial blockage.

As a method of suppressing the reflection of external light without reducing the panel luminance as much as possible, a method using a color filter layer 4 has been conventionally proposed. This is red, green,
The color filter layers 4R, 4G, and 4B that transmit red, green, and blue light are formed on the front substrate 1 corresponding to the emission colors of the blue discharge cells 17. As a result, high color reproducibility as well as high contrast can be obtained.

The color filter layers 4R, 4G, 4B
Is generally composed of fine pigment particles without glass frit. For example, the following materials are considered as pigments that can transmit only red, green, and blue light.

Red: Fe ₂ O ₃ system Green: CoO—Al ₂ O ₃ —Cr ₂ O ₃ system Blue: CoO—Al ₂ O ₃ system It is formed by a printing method. After this is formed, the solvent is vaporized and dried, followed by baking to eliminate the resin.
Thereafter, the transparent dielectric layer 5 is formed on the color filter layers 4R, 4G, and 4B by printing, drying, and firing. However, if the color filter layers 4R, 4G, and 4B are formed directly on the surface discharge electrode group 2H, the bus electrodes 3 will float, resulting in disconnection and breakdown voltage failure when formed into a panel. The floating of the bus electrode 3 occurs when the transparent dielectric layer 5 formed on the color filter layer 4 is fired. The following can be considered as a cause of this. The bus electrode 3 formed on the transparent electrode 2 has weak adhesion to the transparent electrode 2. Because, as described above, the transparent electrode 2 is usually formed by depositing tin oxide or ITO by a thin film technique.

If the bus electrode 3 is formed by, for example, a thick film method, the composition of the bus electrode 3 after firing is a glass frit and a conductive metal. The bus electrode 3 softens the glass frit by firing and adheres to the base to obtain the adhesion of the bus electrode 3 itself. However, the transparent electrode 2 formed by a thin film technology containing no glass frit on the base is used. If there is, even if the glass frit in the bus electrode 3 is softened by baking, the adhesion of the bus electrode 3 to the transparent electrode 2 is weakened.

Further, the color filter layers 4R, 4G, 4B are layers mainly composed of pigment which do not contain glass frit. This is because, when a color filter layer is formed by mixing a glass frit with a pigment, light transmission characteristics are deteriorated, luminance is reduced, and color reproducibility is deteriorated.
The functions as R, 4G, and 4B are halved. Therefore, the color filter layers 4R, 4G, and 4B are usually layers mainly composed of pigments, and do not use glass frit. When a transparent dielectric layer 5 containing glass frit is applied and baked on the color filter layers 4R, 4G, 4B, the bus electrodes 3, the color filter layer 4, and the transparent conductive layer 5 have different thermal expansions. It is considered that stress concentrates on the bus electrode 3 having a weak adhesion, and as a result, the bus electrode 3 floats.

As described above, the transparent dielectric layer (the transparent dielectric layer 5 and the dielectric layer 14 in the case of the opposed discharge type) 5
Has a current control function peculiar to an AC plasma display. This current control function is performed by a transparent dielectric layer (the transparent dielectric layer 5 and the dielectric layer 14 in the case of the opposed discharge type).
In the case of the surface discharge type, the surface discharge electrode group 2H and the transparent dielectric layer 5 are used in the case of the opposed discharge type.
A capacitor is formed by the X electrode 12 and the transparent dielectric layer 5, and the Y electrode 15 and the dielectric layer 14. However, between the surface discharge electrode group 2H and the transparent dielectric layer 5, or between the X electrode 12H
, The color filter layers 4R, 4G,
When 4B is formed, the capacitance is obtained by combining the transparent dielectric layer 5 and the color filter layers 4R, 4G, and 4B in series. However, as described above, the color filter layers 4R,
4G and 4B are made of different materials that can transmit only red, green and blue light. As a result, the capacitance differs for each color, and the opposing discharge voltage rises and the opposing discharge voltage becomes non-uniform.

Further, the transparent electrodes 2 constituting the surface discharge electrode group 2H are formed by a thin film technique such as sputtering.
The thickness of the bus electrode 3 is 2 to 8 microns, while its thickness is 1000 to 2000 angstroms.
That is, the capacitance of the capacitor formed by the surface discharge electrode group 2H and the transparent dielectric layer 5 is the largest on the bus electrode 3, but the color of the material on the bus electrode 3 differs depending on the red, green, and blue colors. When the filter layers 4R, 4G, and 4B are formed, the capacitance of each of the red, green, and blue cells is different, and as a result, the opposing discharge voltage particularly between the scan electrode and the data electrode 8 increases or becomes non-uniform. Occurs.

On the other hand, as a prior known technique, Japanese Patent Laid-Open No.
No. 11180 discloses a technique for making the color filter layers 42a and 42b smaller than the area of a region surrounded by the black mask 43 in a color PDP using a color filter as shown in FIG. I have. On the front substrate 41, the color filter layers 42a and 42b
5 are formed. In FIG.
Is a window. On the rear substrate 46, a display anode 47, a dielectric layer 48, and a phosphor layer 49 are provided. A partition 50 is located between the black mask 43 and the dielectric layer 48. A portion surrounded by both sides of the partition 50 is a display cell 51.

According to this technique, the color filter layer 42
It is said that optimal brightness and contrast can be obtained by reducing the areas a and 42b.

However, this is a DC color PDP technique. In the case of a DC type color PDP, the cathode 45 and the anode 4
For example, when a color filter layer 42a is formed on the cathode 45, no discharge occurs because the color filter layer 42a is not conductive, and as a result, a display operation cannot be performed. Therefore, the color filter layers 42a and 42b are formed except on the cathode 45. If this technique is directly applied to an AC type color PDP, this technique suggests that the area of the region surrounded by the black mask 43 is smaller than that of the area surrounded by the black mask 43 because of the relationship between luminance and contrast. And an AC type color P in which discharge occurs even if a color filter layer is formed on the electrode.
In the case of DP, even if the color filter layer is formed so as to overlap the electrode, there is no influence on the contrast and the luminance. Further, considering the easiness of manufacture, it can be easily estimated that the color filter layer is formed on the electrode.

However, when this panel is actually manufactured, the electrodes are lifted as described above, which causes disconnection and breakdown voltage failure, so that the panel does not function. Even if no disconnection occurs, a mismatch in capacitance due to different red, green, and blue filter materials occurs between the scan electrode and the data electrode 8 in panel driving. The color of the voltage of the opposed discharge is color-dependent, which makes driving difficult or requires a complicated driving circuit. This technique does not suggest any solution to these problems.

[0037]

As described above, in the case of an AC type color PDP provided with a color filter layer, when a color filter layer is formed on a surface discharge electrode composed of a transparent electrode and a bus electrode, a bus made of metal is formed. In a portion where the electrode and the color filter layer are in contact, the bus electrode floats when the transparent dielectric layer formed on the color filter layer is fired, which causes disconnection and breakdown voltage failure when the panel is formed. The following can be considered as a cause of this.

The bus electrode formed on the transparent electrode has low adhesion to the transparent electrode, and the color filter layer is a layer mainly composed of a pigment containing no glass frit. When a transparent dielectric layer containing glass frit is applied and baked on this color filter layer, the thermal expansion differs between the bus electrode, the color filter layer and the transparent dielectric layer, so that stress concentrates on the bus electrode having weak adhesion. As a result, floating of the bus electrode occurs.

The transparent dielectric layer (or dielectric layer) has a current control function unique to an AC type color PDP.
This is realized by forming a capacitor with a surface discharge electrode (or X electrode) and a transparent dielectric layer, or a Y electrode and a dielectric layer. However, when a color filter layer is formed between the surface discharge electrode and the transparent dielectric layer, between the X electrode and the transparent conductive layer, or inside the transparent dielectric layer, the capacitance of this capacitor is changed to the transparent dielectric layer. And a color filter layer in series. However, the red, green, and blue light-transmitting color filter layers are made of different materials. As a result, the capacitance differs for each color, and the opposing discharge voltage rises and the opposing discharge voltage becomes non-uniform.

Further, the thickness of the transparent electrode constituting the surface discharge electrode is 1000 to 2000 Å, while the thickness of the bus electrode is 2 to 8 μm. In other words, the transparent dielectric layer is thinner on the bus electrode by the height of the bus electrode than on the transparent electrode. As a result, the capacitance of the bus electrode portion is the largest, and especially in this portion, the bus electrode portion has the opposite capacitance. The discharge characteristics of the discharge are greatly affected. Therefore, if a color filter layer is formed between the surface discharge electrode and the transparent dielectric layer or inside the transparent dielectric layer, the capacitance differs for each color, resulting in an increase in the opposing discharge voltage and non-uniformity of the opposing discharge voltage. There is a problem.

[0041]

According to the present invention, there is provided a first substrate, a surface discharge electrode group including a plurality of transparent electrodes and bus electrodes on the first substrate, and an orthogonal to the surface discharge electrode group. A color filter layer having a translucency of red, green, and blue, a transparent dielectric layer, and a protective layer formed to cover the transparent conductive layer. Board and
An AC surface discharge type color plasma display panel including a plurality of data electrodes and a partition for obtaining a discharge space on the second substrate, and a phosphor which emits red, green and blue light when excited by ultraviolet rays. A color plasma display panel is obtained, wherein the color filter layer and the bus electrode on the first substrate are positioned so as not to overlap with each other.

Also, according to the present invention, a first substrate, a plurality of X electrodes and red, green,
A color filter layer having a blue translucency, a transparent dielectric layer,
A second substrate, a plurality of Y electrodes on the second substrate, and a protective layer formed to cover the Y electrode; and a protective layer formed to cover the transparent conductive layer. A dielectric layer to be formed, a partition formed on the dielectric layer in a stripe shape so as to be orthogonal to the Y electrode, a phosphor that emits red, green, and blue light when excited by ultraviolet light formed between the partitions. A protection layer formed in a stripe shape in parallel with the partition at substantially the center between the partitions, wherein the X electrode formed on the first substrate and the Y electrode formed on the second substrate are orthogonal to each other. In the AC facing discharge type color plasma display panel in which the first substrate and the second substrate are bonded together, the color filter layer on the first substrate is parallel to the X electrode, And shift so as not to overlap with the X electrode The color plasma display panel is obtained, characterized in that it is location.

[0043]

According to the color PDP of the present invention, in the case of the surface discharge AC type, since the color filter layer is not in contact with the bus electrode, the bus electrode does not float when the transparent dielectric layer is fired. As a result, when the panel is formed, it is possible to suppress the occurrence of disconnection and breakdown voltage failure.

Even if the color filter layer is formed on the same plane as the bus electrode (or X electrode) or formed inside the transparent dielectric layer, the transparent dielectric layer is formed on the bus electrode (or X electrode). There is only a layer and a protective layer, and as a result, the electric charge stored on the surface of the transparent dielectric layer on the bus electrode (or on the X electrode) does not depend on the material of the color filter layer. Therefore, voltage non-uniformity does not occur due to the color filter layers having translucency of red, green, and blue, and the discharge voltage is stabilized over the entire panel.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a color PDP (color plasma display panel) of the present invention will be described below with reference to the drawings. 1 and 2 show a color PDP according to the first embodiment, and show an example in which the present invention is applied to a surface discharge AC type color PDP having a color filter layer. FIG. 1 shows a sectional structure of a color PDP, and FIG. 2 shows a state when viewed from a display surface side. Note that the same parts as those of the color PDP shown in FIGS.

Referring to FIGS. 1 and 2, a color PDP according to the first embodiment includes a front substrate (glass substrate) 1 as a first substrate, and a plurality of transparent substrates provided on the front substrate 1. Surface discharge electrode group 2 including electrode 2 and bus electrode 3
H, a color filter layer 4 having translucency of red, green, and blue and formed to be orthogonal to the surface discharge electrode group 2H.
R, 4G, 4B (4R; red color filter layer, 4G;
A green color filter layer, 4B; a blue color filter layer), a transparent dielectric layer 5, and a protective layer 6 formed so as to cover the transparent conductive layer 5.

Further, the color PDP in the first embodiment is a back substrate (glass substrate) which is a second substrate.
10, a plurality of data electrodes 8 on the rear substrate 10,
A partition wall 7 (see FIG. 7) for obtaining a discharge space, and a phosphor 9R that emits red, green, and blue light when excited by ultraviolet light.
9G, 9B (9R; red phosphor layer, 9G; green phosphor layer, 9B; blue phosphor layer).

Color filter layers 4 R, 4 on front substrate 1
The G and 4B and the bus electrode 3 are arranged at shifted positions so as not to overlap each other. Color filter layer 4R, 4
G and 4B are in contact with the transparent electrode 2 and the front substrate 1.

On the back substrate 10, a data electrode 8, a partition 7 (not shown) and phosphors 9R, 9G, 9B are sequentially formed in the same manner as in the conventional example shown in FIGS.
A discharge cell 11 (see FIG. 7) for obtaining each emission color is composed of a data electrode 8 and a surface discharge electrode group 2H of the front substrate 1 opposed to each other with the partition wall 7 interposed therebetween.

The front substrate 1 includes a surface discharge electrode group 2H including a plurality of transparent electrodes 2 and bus electrodes 3, and a surface discharge electrode group 2H.
The color filter layers 4R, 4G, and 4B having translucency of red, green, and blue, which are formed so as to be orthogonal to the H group, the transparent dielectric layer 5, and the transparent dielectric layer 5 are formed. And a protective layer 6. At this time, the color filter layers 4R,
4G and 4B are shifted so that the bus electrodes 3 do not overlap each other.

Color PDP in First Embodiment
Are manufactured as described below. First,
A transparent conductive film is solidly formed on the front substrate 1. Tin oxide (SnO ₂ ), indium tin oxide (ITO), or the like can be considered as the transparent dielectric film. In this embodiment, ITO is used. As a film forming method, a sputtering method, a CVD method, or a printing method using a pasted material can be considered. In this embodiment, the film is formed by the sputtering method and has a thickness of 1000 to 2000 Å. It was about the thickness. After a transparent dielectric film is solidly formed, a resist is applied, dried, exposed and developed, and then etched to form a shape as an electrode. Thereby, the transparent electrode 2 is formed.

Next, as described in the conventional example, the transparent electrode 2
Has a high resistance value of several tens kΩ or more, so that the bus electrode 3 having a low resistance value is formed. Chrome /
Copper / chromium, aluminum, silver or the like can be considered, but silver was used in this embodiment. Also, as a forming method, a thin film formed by a sputtering method and a thick film formed by a printing method can be considered. In the present embodiment, since silver was used, it was formed by a printing method which is a thick film technique. Here, the reason why the bus electrode 3 made of thick film silver is adopted is that the required line resistance of the bus electrode 3 (several hundred Ω or less) can be realized, and the firing temperature can be 600 ° C. or less. According to the printing method using the paste, it can be formed very easily because direct patterning is possible. In addition, it is superior in terms of cost. The silver paste used for this printing is
It is a mixture of silver powder, glass powder, and an organic solvent and resin mixed to form a paste.

After the pattern is formed, 500 to 6
By baking at 00 ° C., the organic solvent and the resin in the paste were burned so as not to remain in the pattern. The thickness of the bus electrode 3 after firing was about 6 microns.

After the bus electrode 3 is formed, the color filter layers 4R, 4G, 4B are formed thereon. The printing was performed by a printing method. First, a paste in which a binder and a solvent are mixed with a red fine particle pigment mainly composed of iron oxide is printed. However, in order to prevent this stripe-shaped pattern from being formed on the bus electrode 3, it is necessary to form a screen pattern in advance so as not to be printed on the portion where the bus electrode 3 is located. After printing, the solvent was evaporated at about 150 ° C. and dried.

Next, using a paste prepared by mixing a binder and a solvent with a green fine particle pigment mainly containing oxides of cobalt, chromium, and aluminum, printing is performed in parallel with the already printed red pigment pattern, dry. Finally, using a paste prepared by mixing a binder and a solvent with a blue pigment mainly containing oxides of cobalt and aluminum, printing is performed parallel to the already printed green pigment pattern, followed by drying. Naturally, neither the green pigment nor the blue pigment is formed on the bus electrode 3 like the red pigment. After the portion corresponding to the display portion was entirely covered with the pigment of each color by the three times of pigment printing, baking was performed at 500 to 600 ° C. The thickness of the color filter layer after firing was about 2 microns for all three colors. The particle size of the used inorganic pigment particles is 0.01 to 0.05.
It is a very fine and dense layer of about a micron.

A low-melting glass paste was screen-printed thereon and fired at 500 to 600 ° C. to form a transparent dielectric layer 5. The thickness of the transparent dielectric layer 5 after firing was about 30 microns. After forming the transparent dielectric layer 5, MgO is formed so as to cover the entire transparent dielectric layer 5.
Is formed. MgO was formed by a vapor deposition method, and the film thickness was 0.5 to 1 μm.

The front substrate 1 is prepared in this manner, and a panel is formed by combining the front substrate 1 with the rear substrate 10. However, the transmitted colors of the color filter layers 4R, 4G, 4B formed on the front substrate 1 and the phosphors 9R, 9
It goes without saying that the emission colors of G and 9B are matched.

Table 1 shows the disconnection rates of the color PDP panel (10 panels) and the color PDP panel (30 panels) prepared according to the prior art.

[0059]

[Table 1] However, the formation length of the bus electrode 3 per color PDP (described as a panel in Table 1) is about 1 km. The reflectance of the panel was about 15% in the conventional panel, while the color PDP of the present invention was also 15%. The principle (high contrast and high color reproducibility) that can be achieved by forming such color filter layers 4R, 4G, and 4B is based on the principle that the color filter layers 4R, 4G, and 4B are viewed from the display surface side.
R, 4G, 4B white phosphor 9 of body color
R, 9G, and 9B can be prevented from lowering the contrast, and the fact that light other than ultraviolet rays generated by the discharge is emitted out of the color PDP to deteriorate the emission colors of the phosphors 9R, 9G, and 9B. This is because it is gained by preventing it. The decrease in contrast is affected where the surfaces of the phosphors 9R, 9G, and B9 are visible from the display surface side.

The poor color reproducibility is caused by the phosphors 9R and 9R.
The light emitted from G and 9B is affected at a place where the light passes through the front substrate 1. That is, when viewed from the display surface side, the body color of the phosphors 9R, 9G, and 9B is not seen in the portion where the bus electrode 3 is formed, and further, light passes through the bus electrode 3 and the panel is not illuminated. I never go outside. as a result,
Except on the bus electrode 3, the color filter layers 4R, 4G, 4
Even if B is formed, the contrast and the color reproducibility are not affected at all.

Further, the discharge voltage is controlled by the color filter layer 4.
A color PDP without R, 4G, 4B and a color PD with conventional color filter layers 4R, 4G, 4B
Table 2 shows P and the panel of the present invention. Table 2
It can be seen that the color PDP of the present invention is uniform without depending on the transmission color of the color filter.

[0062]

[Table 2] 3 and 4 show a second embodiment of a surface discharge AC type color PDP. In the second embodiment, the color filter layers 4R, 4G, 4B are formed inside the transparent dielectric layers 5a, 5b. Figure 3 is a color PD
FIG. 4 shows a cross-sectional structure of P, and FIG. 4 shows a state when viewed from the display surface side.

First, a surface discharge electrode group 2H including a transparent electrode 2 and a bus electrode 3 is formed on a front substrate 1. However, since the method of forming the surface discharge electrode group 2H is the same as that of the first embodiment, the description is omitted.

Next, a transparent dielectric 5a is formed so as to cover the surface discharge electrode group 2H. The transparent dielectric layer 5a is formed by applying a paste of low melting point glass by a screen printing method,
It is formed by firing at 600 ° C. The thickness of the transparent dielectric layer 5a after firing was about 10 microns.

The color filter layers 4R, 4G, 4B are formed on the transparent dielectric layer 5a. As a forming method, a method of forming by a PR method using a photosensitive pigment paste, a direct printing method, and the like can be considered. In the present embodiment, the direct printing method is used. The forming method is the same as that of the first embodiment, and a description thereof will be omitted. Naturally, in order to prevent the screen plate used for forming the color filter layers 4R, 4G, 4B from being formed on the bus electrode 3, a pattern of the screen plate is previously formed on the portion where the bus electrode 3 is located. Needless to say, it was formed so as not to be printed.

A paste of low melting glass was screen-printed on the transparent dielectric layer 5a and baked at 500 to 600 ° C. to form a transparent dielectric layer 5b. The thickness of the transparent dielectric layer 5b after firing was about 20 microns. After forming the transparent dielectric layer 5b, a protective layer 6 made of MgO is formed so as to cover the entire transparent dielectric layer 5b. MgO was formed by a vapor deposition method, and the film thickness was 0.5 to 1 μm.

On the other hand, the back substrate 10 has the data electrodes 8, the partition walls 7 and the phosphors 9R, 9G, 9
B are sequentially formed.

The front substrate 1 and the rear substrate 10 thus formed are combined to form a color PDP; panel. However, it goes without saying that the transmitted colors of the color filter layers 4R, 4G, 4B formed on the front substrate 1 match the emission colors of the phosphors 9R, 9G, 9B formed on the rear substrate 10.

As a result of driving this color PDP, the color filter layers 4R, 4G, and 4B are formed inside the transparent dielectric layer 5b, so that no disconnection of the electrodes occurs. Since the filter layers 44R, 4G, and 4B are not formed, the write voltages for red, green, and blue are also uniform over the entire surface of the color PDP, and a good color P is obtained.
I got DP.

FIGS. 5 and 6 show a third embodiment of the color PDP of the opposed discharge AC type. In the third embodiment, the color filter layers 4R, 4G, 4B
Are formed inside the transparent dielectric layers 5a and 5b. FIG. 5 shows a cross-sectional structure of the color PDP, and FIG. 6 shows a state when viewed from the display surface side. Note that the same parts as those of the color PDP shown in FIGS.

Referring to FIGS. 5 and 6, a color PDP according to the third embodiment includes a front substrate 1 as a first substrate, and a plurality of X electrodes 12 on the front substrate 1.
And color filter layer 4 having red, green, and blue translucency
R, 4G, 4B, transparent dielectric layers 5a, 5b, and protective layer 6 formed to cover these transparent conductive layers 5a, 5b.
And

The color PDP further includes a back substrate 10 as a second substrate, a plurality of Y electrodes 15 on the back substrate 10, a dielectric layer 14 formed to cover the Y electrodes 15, Partition walls 7 formed in stripes on dielectric layer 14 so as to be orthogonal to Y electrodes 15 (see FIG. 7)
And phosphors 9R, 9G, and 9B that emit red, green, and blue light when excited by ultraviolet rays formed between the barrier ribs 7 and a protective layer 16 that is formed in a stripe shape substantially parallel to the barrier ribs 7 at substantially the center between the barrier ribs 7. have.

The X electrode 12 formed on the front substrate 1 and the Y electrode 15 formed on the back substrate 10 are attached to the front substrate 1 and the back substrate 10 so as to be orthogonal to each other. The color filter layers 4R, 4G, 4B on the front substrate 1
It is located at a position parallel to the electrode 12 and shifted so as not to overlap the X electrode.

The color filter layers 4R, 4G, 4B
Can be formed on a glass substrate. Further, as described above, the color filter layers 4R, 4G, and 4B
It is formed inside the transparent dielectric layers 5a and 5b formed on the front substrate 1.

Hereinafter, a method for forming the front substrate 1 will be described.
First, an X electrode 12 is formed on a front substrate (glass substrate) 1. However, since the X electrode 12 is formed on the front substrate 1 on the display surface side, it is necessary to reduce the electrode width. Therefore, a low-resistance metal is used.

The material of the X electrode 12 may be chromium / copper / chromium, aluminum, silver, or the like. In this embodiment, silver is used. As a forming method, a thin film formed by a sputtering method and a thick film formed by a printing method are conceivable. However, in this embodiment, since silver is used, the printing method is a thick film technique. Here, the reason why the thick film silver is used as the X electrode 12 and the method of forming the X electrode 12 are the same as those of the bus electrode 3 of the first embodiment, and therefore will not be described.

Next, a black mask 13 is formed. The black mask 13 is a phosphor 9 formed on the rear substrate 10 side.
Since the body colors of R, 9G, and 9B are white, they are formed on the front substrate 1 for the purpose of preventing a decrease in contrast due to the white color. As a forming method, a thick film printing method was used.

As the glass powder, a material obtained by adding a black pigment and mixing an organic solvent and a resin to form a paste was used. After printing, drying and evaporating the organic solvent component, it is baked at a temperature of 500 to 600 ° C. to burn the resin in the black mask 13 and further softens the glass component in the black mask 13 by the same baking. The front substrate 1
I was able to get the adhesion to This black mask 13
Is formed, a transparent dielectric layer 5a is formed. Forming method is to screen-print low melting glass paste,
Fired at 0-600 ° C.

After forming the transparent dielectric layer 5a, the color filter layers 4R, 4G, 4B are formed. The printing was performed by a printing method. First, a paste prepared by mixing a resin and a solvent with a red fine particle pigment containing iron oxide as a main component was applied to the X electrode 12.
And on both sides of the X electrode 12. At this time, a pattern of the screen plate is formed so that the paste does not overlap the X electrode 12 when viewed from the display surface side. As a result, the paste is formed between the X electrode 12 and the black mask 13 when viewed from the display surface side. This is dried and the solvent is evaporated.

Next, using a paste prepared by mixing a binder and a solvent with a green fine particle pigment mainly composed of oxides of cobalt, chromium and aluminum, printing of the red pigment beside the already printed red pigment pattern. Print and dry in a similar manner. Finally, using a paste prepared by mixing a binder and a solvent with a blue pigment mainly containing oxides of cobalt and aluminum, printing is performed parallel to the already printed green pigment pattern, followed by drying. After the portion corresponding to the display portion was entirely covered with the pigment of each color by the three times of pigment printing, baking was performed at 500 to 600 ° C. The thickness of the fired color filter layers 4R, 4G, 4B was about 2 microns for all three colors. The particle size of the used inorganic pigment particles is 0.01
It is a very fine and dense layer of about 0.05 micron.

Thereafter, the color filter layers 4R, 4G, 4
A transparent dielectric layer 5b is formed on B. The forming method is the same as that of the above-described transparent dielectric layer 5a, and thus the description is omitted. Finally, a protective layer 6 made of MgO is formed so as to cover the transparent dielectric layer 5b. MgO is deposited by a vapor deposition method and has a thickness of 0.5
１1 μm.

Next, a method of forming the rear substrate will be described. First, the Y electrode 15 is formed on the rear substrate 10. However, since it is important that the resistance is low, it is formed by a printing method which is a thick film technique using silver similarly to the X electrode 12. The forming method is the same as the method of forming the bus electrode 3 of the first embodiment, and a description thereof will be omitted.

Next, a dielectric layer 14 is formed on the Y electrode 15. However, since the transparent dielectric layers 5a and 5b formed on the front substrate 1 must transmit light emitted from the phosphor, it is an absolute condition that the transparent dielectric layers 5a and 5b be transparent.
The dielectric layer 14 formed on the phosphors 9R, 9G, 9
Since the light emission of B must be reflected to the front substrate 1 side, a white dielectric layer was used. This is because the transparent dielectric layer 5a formed on the front substrate 1 is coated with TiO ₂ or the like for 5 to ₂₀ watts.
t% added and whitened one was used. The forming method is the same as that of the transparent dielectric layer 5a, and thus the description is omitted.

As a protective layer 16 on this dielectric layer 14, M
A gO layer is formed. The formation method is MgO paste
Was formed in a stripe shape so as to be orthogonal to the Y electrode 15 by a printing method. After the formation of the protective layer 16, the partition 7 is formed in parallel with the protective layer 16 so as not to overlap. As a method for forming the partition wall 7, a multilayer thick film printing method, a side blast method, or the like can be considered. However, when the partition wall 7 is formed by a sand blast method, the protective layer 16 may be damaged. The material obtained by pasting the material for the partition wall 7 is directly printed using a screen plate, and then dried to remove the solvent content, and then further printed thereon. By repeating this about 10 times, the partition 7
Get height.

After the formation of the partition 7, baking is performed.
This firing not only fires the partition walls 7 but also protects the protective layer 16.
Can also be fired at the same time.

After the formation of the partition walls 7, the phosphors 9R, 9R,
9G and 9B are formed. The phosphor was formed between the barrier ribs 7 by a printing method using a photosensitive phosphor paste, followed by exposure and development. First, a phosphor that emits red light was pasted with a solvent and a photosensitive resin, and formed between partition walls using a screen plate.
However, this red phosphor was not formed between all the partition walls, but was formed every third phosphor. This is to form green and blue phosphor layers between the remaining two partitions. After printing the red phosphor, it was dried and the solvent was evaporated.

Next, using a green phosphor obtained by mixing a solvent and a photosensitive resin with a phosphor that emits green light in the same manner as the red phosphor and pasting the mixture, a red phosphor already formed by a screen plate ( The red phosphor layers 9R) were printed next to 9R. After printing, it was dried and the solvent was evaporated.

Finally, the blue phosphor (blue phosphor layer 9B) 9
B, which are formed by red and green phosphors 9R and 9G.
Since it is the same forming method as described above, the description is omitted.

After printing the red, green, and blue phosphors 9R, 9G, and 9B, exposure and development are performed. As a mask for exposure, a mask having a black pattern drawn on a portion located at the partition 7 and the protective layer 16 was used. Thereby, the phosphors 9R and 9R formed on the protective layer 16 are formed.
G, 9B and phosphors 9R, 9G,
9B is not exposed, and as a result, this unexposed portion can be removed when developed. After development, baking is performed to form phosphors 9R, 9G, and 9B.

The front substrate 1 and the rear substrate 10 formed as described above are arranged such that the X electrodes 12 and the Y electrodes 15 are orthogonal to each other and the color filter layer 4 formed on the front substrate 1 is formed.
R, 4G, and 4B are adhered so that the transmitted colors of the phosphors 9R, 9G, and 9B coincide with each other, and a dischargeable gas is sealed therein to complete a color PDP.

When the color PDP thus formed was driven, no disconnection occurred in the X electrode 12.
This is because the color filter layers 4R, 4G and 4B are formed between the transparent dielectric layers 5a and 5b.
Further, the driving voltage is stable over the entire panel surface, and high contrast and high color reproducibility can be obtained.

In this embodiment, the color filter layer 4
Although R, 4G, 4B are formed between the transparent dielectric layers 5a, 5b, even if they are formed on the front substrate 1, the color filter layers 4R, 4G, 4B are not in contact with the X electrode 12, and There is no transparent electrode under the X electrode 12, and the X electrode 1
Since 2 is formed on the base plate, no disconnection of the X electrode 12 occurs. Further, it goes without saying that the driving voltage is stable over the entire panel surface, and high contrast and high color reproducibility can be obtained.

[0093]

As described above, according to the color plasma display panel of the present invention, the bus electrode (or X electrode) can be used regardless of the surface discharge AC type and the counter discharge AC type.
Since the color filter layer is not in contact with the substrate, no floating of the bus electrode (or X electrode) occurs during firing of the transparent dielectric layer. As a result, when the panel is formed, it is possible to suppress the occurrence of disconnection and breakdown voltage failure.

Further, even if the color filter layer is formed on the same plane as the bus electrode (or X electrode) or formed inside the transparent dielectric layer, only the transparent dielectric layer and the protective layer are present on the bus electrode. As a result, the charge stored on the surface of the transparent dielectric layer on the bus electrode (or X electrode) does not depend on the material of the color filter layer. Therefore, voltage non-uniformity does not occur due to the color filter layers having translucency of red, green, and blue, and the discharge voltage is stabilized over the entire panel.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a color plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a plan view of the color plasma display panel according to the first embodiment of the present invention as viewed from the display surface side.

FIG. 3 is a sectional view of a color plasma display panel according to a second embodiment of the present invention.

FIG. 4 is a plan view of a color plasma display panel according to a second embodiment of the present invention as viewed from the display surface side.

FIG. 5 is a sectional view of a color plasma display panel according to a third embodiment of the present invention.

FIG. 6 is a plan view of a color plasma display panel according to a third embodiment of the present invention as viewed from the display surface side.

FIG. 7 is a perspective view of a conventional reflective AC surface discharge color plasma display panel.

FIG. 8 is a cross-sectional view of a conventional reflective AC surface discharge color plasma display panel.

FIG. 9 is a plan view of a conventional reflective AC surface discharge color plasma display panel viewed from the display surface side.

FIG. 10 shows a conventional reflection type AC facing discharge color plasma.
It is sectional drawing of a display panel.

FIG. 11 shows a conventional reflection type AC facing discharge color plasma.
FIG. 3 is a plan view of the display panel as viewed from a display surface side.

FIG. 12 is a cross-sectional view of a DC type color plasma display panel using a conventional color filter.

[Explanation of symbols]

 1, 41 front substrate 2 transparent electrode 2H surface discharge electrode group 3 bus electrode 4R color filter layer (red color filter layer) 4G color filter layer (green color filter layer) 4B color filter layer (blue color filter layer) 5 transparent dielectric Layers 5a, 5b Transparent dielectric layer 6, 16 Protective layer 7, 50 Partition wall 8 Data electrode 9R Phosphor (red phosphor layer) 9G Phosphor (green phosphor layer) 9B Phosphor (blue phosphor layer) 10, 46 Back substrate 11, 17 Discharge cell 12 X electrode 13, 43 Black mask 14 Dielectric layer 15 Y electrode 42a Color filter 42b Color filter 44 Window 45 Cathode 47 Display anode 48 Dielectric layer 49 Phosphor layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J 17/16 H01J 17/16

Claims (6)

[Claims] 1. A first substrate, a surface discharge electrode group including a plurality of transparent electrodes and bus electrodes on the first substrate, and red, green, and blue electrodes formed to be orthogonal to the surface discharge electrode group. A color filter layer having a blue light-transmitting property, a transparent dielectric layer, a protective layer formed so as to cover the transparent conductive layer, further comprising: a second substrate; In the AC surface discharge type color plasma display panel including a plurality of data electrodes and a partition for obtaining a discharge space, and a phosphor excited by ultraviolet rays to emit red, green, and blue light, the first substrate A color plasma display panel wherein the upper color filter layer and the bus electrode are positioned so as not to overlap with each other. 2. The color plasma display panel according to claim 1, wherein said color filter layer is in contact with said transparent electrode and said first substrate. 3. The color plasma display panel according to claim 1, wherein said color filter layer is formed inside said transparent conductive layer. 4. A first substrate, a plurality of X electrodes on the first substrate, a color filter layer having red, green, and blue transmissive properties, a transparent dielectric layer, and the transparent conductor. A second substrate; a plurality of Y electrodes on the second substrate;
A dielectric layer formed so as to cover the electrodes, partitions formed in stripes on the dielectric layer so as to be orthogonal to the Y electrodes, red, green, and blue excited by ultraviolet rays formed between the partitions A X-electrode formed on the first substrate and a protective layer formed in a stripe shape parallel to the partition at substantially the center between the partitions, and formed on the second substrate. In the AC opposed discharge type color plasma display panel in which the first substrate and the second substrate are bonded so that the Y electrodes are orthogonal to each other, the color filter layer on the first substrate is A color plasma display panel which is parallel to the X electrode and is shifted so as not to overlap the X electrode. 5. The color plasma display panel according to claim 4, wherein said color filter layer is formed on said first substrate. 6. A color plasma display panel according to claim 4, wherein said color filter layer is formed inside said transparent dielectric layer formed on said first substrate. Plasma display panel.