JP2004164885A - Plasma display panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein cross talk is generated to a discharge cell positioned obliquely next in a data electrode extension direction, in a plasma display panel with auxiliary barrier ribs formed perpendicularly to main barrier ribs. <P>SOLUTION: In this plasma display panel, the barrier ribs are composed of the two main barrier ribs 11 formed in parallel with data electrodes 10 and adjoining in the extension direction of a display electrode 5 of a front plate 1, and the auxiliary barrier ribs 12 with both ends branched in two directions connected to the barrier ribs 11; and an auxiliary barrier rib forming angle formed by each barrier rib 11 and the corresponding barrier rib 12 is set at right angle or at an obtuse angle. By virtue of this structure, the intersection part of the barrier rib 11 with the barrier rib 12 are branched into three directions, so that contractive force of the intersection parts of the barrier ribs is reduced. As a result, the depression amount of each intersection part of the barrier ribs is reduced, and leakage of plasma discharge can be prevented. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plasma display panel (hereinafter, referred to as PDP) and a method for manufacturing the same.
[0002]
[Prior art]
In recent years, PDPs have attracted attention as display panels (thin display devices) having excellent visibility, and high brightness, high definition, and large screens have been promoted. This PDP is roughly classified into an AC (AC) type and a DC (DC) type in a driving system, and two types of discharge types, a surface discharge type and a facing discharge type. At present, PDPs of AC type and surface discharge type have come to occupy the mainstream because of high definition, large screen and simplicity of manufacturing.
[0003]
The general structure of this AC type surface discharge type PDP is as follows. That is, a plurality of display electrodes covered with a dielectric layer and a protective layer are formed on the glass substrate on the front plate side. In addition, a plurality of stripe-shaped data electrodes covered with an insulator layer and partitions are provided in parallel between the data electrodes on the glass substrate on the back plate side, and a discharge formed by the insulator layer and the partitions is provided. A phosphor layer is formed in the space. Further, auxiliary partitions are provided at right angles to the partitions for the purpose of preventing a problem on image display such as crosstalk at the time of higher definition (for example, see Patent Document 1). The discharge cells that divide the discharge space are formed so as to be surrounded by partition walls and auxiliary partition walls.
[0004]
[Patent Document 1]
JP 2001-23515 A (pages 3-4)
[0005]
[Problems to be solved by the invention]
However, even in a PDP structure in which auxiliary partitions are provided orthogonal to such partitions, image quality may deteriorate due to crosstalk during image display. This crosstalk also occurs in the discharge cells located diagonally adjacent to the extending direction of the data electrodes.
[0006]
The present invention has been made in view of such a problem, and has as its object to provide a high-quality PDP that prevents occurrence of crosstalk.
[0007]
[Means for Solving the Problems]
As a result of studying the cause of the occurrence of the crosstalk, the present inventor has confirmed that a dent has occurred in the partition wall at a portion orthogonal to the main partition wall and the auxiliary partition wall. It has been found that when a dent occurs, plasma discharge leaks from a gap created between the dent and the front plate, and this causes crosstalk. This dent is considered to be caused by shrinkage caused by removing the binder and the solvent in these materials by baking performed when forming the main partition and the auxiliary partition.
[0008]
Therefore, the PDP of the present invention includes a display electrode disposed on a front substrate, a data electrode disposed on a rear substrate opposed to the front substrate with a discharge space interposed therebetween, in a direction orthogonal to the display electrode, a display electrode, A partition formed so as to partition a plurality of discharge cells formed by the data electrodes, and a phosphor layer formed in a cell space defined by the partition, and the partition is formed in parallel with the data electrodes and displayed. The main partition is composed of two main partitions adjacent to each other in the direction in which the electrodes extend, and auxiliary partitions having both ends branched in two directions joined to the main partitions, and the auxiliary partition formed by the main partition and the auxiliary partition is formed at a right angle or an obtuse angle. It is what it was.
[0009]
By using a PDP having such a partition structure, the intersection of the main partition and the auxiliary partition is formed in three directions, and the shrinkage force due to firing acting on the intersection is reduced as compared with a conventional cross formed in four directions. .
[0010]
In the PDP of the present invention, the cell space has a hexagonal shape.
[0011]
Considering the balance of the contraction forces acting on the intersection of the partition and the auxiliary partition, if these forces are not balanced, the partition and the auxiliary partition will tilt in either direction. Therefore, at the intersection of the partition and the auxiliary partition in the two directions, it is necessary to apply the contraction force from the auxiliary partition in the two directions in the opposite direction to the contraction force acting in the extending direction of the partition. For that purpose, the intersection angle between the partition and the auxiliary partition must exceed 90 degrees. Further, considering the balance of the contraction force at the intersection of the auxiliary partition walls, the coupling of the partition adjacent to the display electrode extension direction with the auxiliary partition alone does not balance the contraction force in the data electrode extension direction.
[0012]
Therefore, the contraction force at the intersection of the auxiliary partitions is also balanced by coupling with the auxiliary partitions of the partitions adjacent in the data electrode extending direction. The contraction force acting on the intersection is proportional to the volume of the intersecting partition wall and the auxiliary partition wall. That is, this contraction force is caused by volume contraction, and reducing the length, width, and height of the intersecting partition wall and auxiliary partition wall has an effect of reducing the contraction force acting on the intersection. In addition, it is necessary to intersect at the intersection in a shape in which the contraction forces from the partition and the auxiliary partition are balanced. For example, at the intersection of the one-way partition and the two-way auxiliary partition having the same thickness and length, they may intersect at intervals of 120 degrees.
[0013]
Further, the method of manufacturing a PDP according to the present invention is characterized in that after forming a main partition and an auxiliary partition in a predetermined shape using a partition material containing glass powder, the main partition and the auxiliary partition are fired to form the partition.
[0014]
With such a manufacturing method, the main partition and the auxiliary partition intersect in three directions, and the contraction force acting on the intersection is reduced. As a result, the dent amount of the partition also decreases. As a result, there is no leakage of the plasma discharge and no crosstalk occurs. In addition, the production method of the present invention exerts its effect by, for example, sandblasting, photopaste, screen printing, or embedding, in which the main partition and the auxiliary partition are solidified by firing.
[0015]
In the method of manufacturing a PDP according to the present invention, the auxiliary partition is formed in an arc shape when the auxiliary partition is formed from the partition wall material.
[0016]
According to such a manufacturing method, the auxiliary partition is pulled by the shrinkage force of the partition and the auxiliary partition at the time of firing, and the auxiliary partition having an arc-shaped bottom surface becomes an auxiliary partition having a rectangular bottom surface. As described above, the contraction force acting on the intersection of the partition and the auxiliary partition is used for the shape deformation of the auxiliary partition, and the contraction force acting on the contraction of the partition is reduced, so that the recess amount is further reduced.
[0017]
Further, the effect of the present invention is particularly effective when a mixture of glass powder and a photosensitive organic substance is used as the partition wall material. This is because a material composed of a glass powder and a photosensitive organic substance has a large amount of binder and loses the binder after firing, so that the shrinkage becomes large. Therefore, by using such a material and adopting the above-described method of manufacturing a PDP, the effect of reducing the amount of depression due to shrinkage of the partition wall is great.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0019]
(First Embodiment)
FIG. 1 is a perspective view of a main part of a PDP according to a first embodiment of the present invention. The front plate 1 is formed by arranging display electrodes 5 each composed of a scanning electrode 6a and a sustain electrode 6b on a front substrate 2 composed of a transparent and insulating glass substrate so as to be parallel to each other, and covering them. It is formed by forming a dielectric layer 3 and further forming a protective layer 4 on the dielectric layer 3.
[0020]
Here, the display electrodes 5 have a constant pitch on the front substrate 2 and are formed in a predetermined number. In addition, since it is necessary to form the dielectric layer 3 after the formation of the display electrode 5 and to cover the display electrode 5 reliably, generally, a low melting glass is printed and fired by a printing and firing method. Has formed. As a glass paste material, for example, a so-called (PbO-SiO) including lead oxide (PbO), silicon oxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), zinc oxide (ZnO), and barium oxide (BaO) is used. _{2 -B 2 O 3 -ZnO-BaO} ) based low-melting glass paste having the glass composition can be used. For example, by repeating screen printing and baking using this glass paste, the dielectric layer 3 having a predetermined thickness can be easily obtained. Note that this film thickness may be set according to the thickness of the display electrode 5, a target capacitance value, or the like. In the first embodiment of the present invention, the thickness of the dielectric layer 3 is about 40 μm. Further lead oxide (PbO), it is also possible to use a glass paste mainly composed of at least one of bismuth oxide _(Bi 2 _{O 3),} and phosphorus oxide (PO _4).
[0021]
The protective layer 4 is provided to prevent the dielectric layer 3 from being sputtered by plasma discharge, and is required to be a material having excellent sputtering resistance. For this reason, magnesium oxide (MgO) is often used.
[0022]
On the other hand, the back plate 7 has a data electrode 10 for writing image data disposed on a back substrate 8, which is also a transparent and insulating glass substrate, in a direction perpendicular to the display electrodes 5 of the front plate 1. It is formed. After an insulator layer 9 is formed on the surface of the rear substrate 8 so as to cover the data electrodes 10, the extending direction of the display electrodes 5 is substantially parallel to the data electrodes 10 at a substantially central portion between the data electrodes 10. Are formed, two auxiliary partitions 12 are formed between the main partitions 11 and both ends branched in two directions are joined to each other. A plurality of discharge cells formed by the display electrode 5 and the data electrode 10 are partitioned by the partition composed of the main partition 11 and the auxiliary partition 12. The formation of the partition will be described later.
[0023]
Further, the phosphor layer 14 is formed in the cell space defined by the partition walls, including the side wall portions of the main partition wall 11 and the auxiliary partition wall 12, thereby forming the back plate 7. In the phosphor layer 14, phosphors that emit R light, G light, and B light are formed adjacent to each other, and these constitute a pixel.
[0024]
The data electrode 10 may be formed by a printing / firing method using a single-layer structure film of low resistance such as silver, aluminum, or copper, or a multilayer structure film such as a two-layer structure of chromium and copper or a three-layer structure of chromium, copper, and chromium. It is formed by a thin film forming technique such as sputtering or sputtering. Further, the insulator layer 9 can be formed by using the same material and the same film forming method as the dielectric layer 3. Further lead oxide (PbO), may be used glass paste mainly composed of at least one of bismuth oxide _(Bi 2 _{O 3),} and phosphorus oxide (PO _4). The phosphor layer 14 can form phosphors respectively emitting R light, G light, and B light on the wall surfaces of the main partition 11 and the auxiliary partition 12 and an area surrounded by the phosphors by, for example, an inkjet method.
[0025]
When the front plate 1 and the rear plate 7 are opposed to each other, a discharge space 15 surrounded by the main partition 11, the auxiliary partition 12, the protective layer 4 on the front substrate 2, and the phosphor layer 4 on the rear substrate 8 is generated. The discharge space 15 was filled with a mixed gas of Ne and Xe at a pressure of about 66.5 kPa, and was excited when an AC voltage of several tens to several hundreds of kHz was applied between the scan electrode 6a and the sustain electrode 6b to cause discharge. The phosphor layer 14 can be excited by ultraviolet rays generated when the Xe atoms return to the ground state. The phosphor layer 14 emits R light, G light, or B light according to the applied material by this excitation. Therefore, if a pixel to be emitted by the data electrode 10 and a color are selected, a predetermined pixel portion is obtained. Thus, a required color can be emitted, and a color image can be displayed.
[0026]
Next, a method for forming the main partition 11 and the auxiliary partition 12 will be described.
[0027]
FIG. 2 is a plan view of the main partition 11 and the auxiliary partition 12 formed in the first embodiment of the present invention as viewed from the display electrode 5 side. The same components as those shown in FIG. 1 are denoted by the same reference numerals.
[0028]
A photosensitive paste obtained by mixing a low melting point glass powder and a photosensitive organic substance is applied on the insulator layer 9 to a thickness of 0.2 mm using, for example, a die coater. The photosensitive paste contains glass powder containing substantially the same amounts of silicon oxide and boron oxide as main components, and an organic component made of a photosensitive acrylic polymer using γ-butyrolactone as a solvent. After drying the applied photosensitive paste, exposure is performed through a photomask having a predetermined pattern in which the shapes of the main partition 11 and the auxiliary partition 12 are determined. Thereafter, the photosensitive paste is developed using an aqueous solution of an organic alkali and solidified by heating such as baking to obtain a main partition 11 and an auxiliary partition 12 having the shape shown in FIG.
[0029]
Here, the main partition 11 and the auxiliary partition 12 have the same shape, and the main partition 11 is formed in parallel with the data electrode 10 formed on the rear substrate 8. The length of the main partition 11 is the distance between the scanning electrode 6a and the sustaining electrode 6b of the two pairs of display electrodes 5 adjacent to each other. As shown in FIG. 2, the auxiliary partition 12 is formed so that both ends are branched in two directions and coupled to the main partition 11. The auxiliary partition wall forming angle 13 which is an angle formed between the main partition 11 and the auxiliary partition 12 is a right angle or an obtuse angle. A cell space of the discharge cell 16 is formed by being surrounded by the main partition 11 and the auxiliary partition 12. In the first embodiment, the cell space has a hexagonal shape.
[0030]
Next, the depression amount T of the partition wall will be described with reference to FIG. FIG. 3 is a cross-sectional view when the insulating layer 9 is formed on the back substrate 8, and the back plate 7 on which the main partition 21 and the auxiliary partition 22 are formed is cut in parallel with the extending direction of the main partition 21. FIG. 3 shows a case in which a dent is formed at a crossing point where a main partition 21 and an auxiliary partition 22 having a conventional shape are orthogonal to each other. Here, the dent amount T is the difference between the height of the main partition wall 21 sufficiently distant from the intersection after firing and the height of the main partition wall 21 at the intersection.
[0031]
When the main partition 21 and the auxiliary partition 22 are perpendicular to each other, the dent amount T is about 10 μm. However, in the first embodiment, the depression amount T can be suppressed to 3 μm or less. It is considered that the reason why the depression amount T of the partition wall after firing can be reduced is that the contraction force to the intersection at the time of firing the partition wall is reduced. That is, when the main partition 21 and the auxiliary partition 22 are made orthogonal to each other, the contraction force of the main partition 21 and the auxiliary partition 22 from four directions acts at the intersection. On the other hand, at the intersection of the main partition 11 and the auxiliary partition 12 as in the first embodiment, the contraction force in only one direction in which the main partition 11 extends and two directions of the auxiliary partition 12 is reduced only in a total of three directions. Will work. Further, the auxiliary partition wall 12 also intersects with the intersection of the auxiliary partition walls 12, and the contraction force also acts on the intersection, so that the contraction force acting on the intersection with the main partition is reduced correspondingly.
[0032]
In the PDP manufactured by the manufacturing method described above, crosstalk does not occur not only in the extending direction of the data electrode 10 but also in a direction obliquely adjacent to the extending direction of the data electrode 10. This is because the PDP manufactured according to the first embodiment has the depression T of 3 μm as described above, while the depression T is about 10 μm at the conventional intersection where the main partition 21 and the auxiliary partition 22 are perpendicular to each other. This is because the leakage of the plasma discharge can be prevented in the direction in which the data electrode 10 extends and in the direction obliquely adjacent to the direction in which the data electrode 10 extends.
[0033]
(Second embodiment)
FIG. 4 is a perspective view for explaining a method of manufacturing a main partition and an auxiliary partition according to the second embodiment of the present invention. The second embodiment is different from the first embodiment only in the photomask having a predetermined shape pattern in which the shapes of the main partition and the auxiliary partition are determined.
[0034]
FIG. 4A shows the shapes of a main partition and an auxiliary partition after exposure and development with a photomask having a predetermined pattern, and a main partition 11 having the same shape as that of the first embodiment and an arc-shaped auxiliary partition. The partition 12. Further, the auxiliary partition 12 has a shape in which it is connected to the main partition 11 adjacent to the display electrode and the data electrode 10 in the extending direction. FIG. 4B shows a state in which the main partition 11 and the auxiliary partition 12 are baked and solidified.
[0035]
As can be seen from FIGS. 4 (a) and 4 (b), after the exposure and development steps, the arc-shaped auxiliary partition walls 12 are respectively joined to form a substantially circular shape, but after the firing step, become a square shape. This is because the shrinkage force accompanying firing, which acts on the intersections, caused shape deformation. That is, the contraction force acts as a tensile force at the intersection of the arc-shaped auxiliary partition walls 12, and the auxiliary partition walls 12 having a square shape are created.
[0036]
As described above, the intersection of the main partition 11 and the auxiliary partition 12 is a contraction force only from three directions, and a part of the contraction force is used for shape deformation as described above. Therefore, the contraction force acting on the main partition 11 was reduced, and the dent amount T could be reduced to 2 μm or less.
[0037]
As described above, according to the PDP of the second embodiment and the method of manufacturing the same, the amount of depression of the partition wall is further reduced, the leakage of plasma discharge is prevented, and the extension of the data electrode Crosstalk does not occur in the direction obliquely adjacent to the direction.
[0038]
The material obtained by mixing the glass powder and the photosensitive organic substance has a large binder amount. In the main partition 11 and the auxiliary partition 12 made of the material, the volume shrinkage obtained by dividing the volume after firing by the volume before firing is about 60%. There is a large depression in the partition wall. Therefore, when the main partition 11 and the auxiliary partition 12 are made of a material in which glass powder and a photosensitive organic substance are mixed, the shape of the partition in the first and second embodiments has an effect of reducing the dent at the intersection.
[0039]
In the first and second embodiments, when the main partition 11 and the auxiliary partition 12 are formed, the volume shrinkage generated in the main partition 11 and the auxiliary partition 12 due to firing and solidification is reduced by the first and second partitions. Has been shown to be effective, but the main partition 11 and the auxiliary partition 12 are not particularly limited to those formed by firing and solidification, as long as they are formed with volume shrinkage. The same effect can be obtained.
[0040]
【The invention's effect】
As described above, in the PDP of the present invention, the partition walls are formed in parallel with the data electrodes and are adjacent to the main electrode in the direction in which the display electrodes extend, and the auxiliary partition walls are connected to the main partitions at both ends branched in two directions. And the angle of formation of the auxiliary partition formed by the main partition and the auxiliary partition is a right angle or an obtuse angle.
[0041]
With such a configuration, the amount of depression of the partition at the intersection of the main partition and the auxiliary partition is reduced, and the plasma discharge is performed not only in the extending direction of the data electrode but also in a direction obliquely adjacent to the extending direction of the data electrode. Leakage is prevented, crosstalk is prevented from occurring, and a high-quality PDP can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a PDP of the present invention. FIG. 2 is a plan view of a partition and an auxiliary partition of the PDP of the present invention viewed from a display electrode side. FIG. FIG. 4 is a view showing a partition structure of a PDP according to another embodiment of the present invention. FIG. Perspective view of [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Front plate 2 Front substrate 3 Dielectric layer 4 Protective layer 5 Display electrode 6a Scan electrode 6b Sustain electrode 7 Back plate 8 Back substrate 9 Insulator layer 10 Data electrode 11, 21 Main partition 12, 22 Auxiliary partition 13 Auxiliary partition formation angle 14 phosphor layer 15 discharge space 16 discharge cell

Claims (5)

A display electrode disposed on the front substrate, a data electrode disposed in a direction orthogonal to the display electrode on a rear substrate opposed to the front substrate across a discharge space, and formed by the display electrode and the data electrode. And a phosphor layer formed in a cell space defined by the partition, wherein the partition is formed in parallel with the data electrode and the display electrode is formed. Two main partitions adjacent to each other in the direction of extension, and auxiliary partitions formed by joining both ends branched in two directions to the main partitions, and forming an auxiliary partition angle formed by the main partition and the auxiliary partition at a right angle or A plasma display panel having an obtuse angle. The plasma display panel according to claim 1, wherein the shape of the cell space is a hexagon. It is a manufacturing method of the plasma display panel of Claim 1, Comprising:
A method for manufacturing a plasma display panel, comprising: forming a main partition and an auxiliary partition in a predetermined shape using a partition material containing glass powder; and baking the main partition and the auxiliary partition to form a partition. The method according to claim 3, wherein the auxiliary partition is formed in an arc shape when forming the auxiliary partition using the partition material. 5. The method according to claim 3, wherein the partition wall material is a mixture of a glass powder and a photosensitive organic substance.

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