JP2002304948A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel having excellent quality while securing an exhaust passage for filling a discharge gas. SOLUTION: This plasma display panel is equipped with a back substrate 1, plural discharge cells 4 formed by arranging them in a zigzag shape on the back substrate, plural barrier ribs 5 surrounding respective discharge spaces of the plural discharge cells, a phosphor film 7 formed on the inner wall surface of each barrier rib 5 and on the back substrate 1 inside the barrier plate, and a front substrate 2 disposed face to face with the back substrate 1 while having a discharge electrode 8 corresponding to the discharge cell 4. The barrier rib 5 is formed separately from other adjacent barrier ribs 5 surrounding the discharge cells 4, and its outline on a plan view is formed in a polygonal shape with number of sides more than that of a pentagon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plasma display panel (PDP) having a discharge cell surrounded by a partition.
About.

[0002]

2. Description of the Related Art As this type of PDP, as shown in FIG. 5, discharge cells 14 are arranged in a grid pattern so as to straddle a plurality of address electrodes 13 formed in parallel in a predetermined direction. It is known that the partition walls 15 surrounding the discharge cells 14 have a quadrangular outer shape in a plan view, and the partition walls 15 are separated independently from each other (Japanese Patent Application Laid-Open No. H5-182592).

In the PDP having such a structure, an exhaust passage communicating with the exhaust port at the end of the panel can be formed around the partition wall 15, so that the exhaust passage can be used to form the inside of the discharge cell 14 surrounded by the partition wall 15. And discharging gas into the discharge cell 14 can be performed.

In addition, the partition walls 15 of the discharge cells 14 are
As another conventional example of a PDP in which the discharge cells 14 are independently separated from each other, there is a PDP in which the discharge cells 14 are arranged in a staggered pattern (alternate vertically and horizontally) as shown in plan views and perspective views in FIGS.
In this PDP, the external shape of the partition wall 15 in a plan view is a rhombus, and the partition wall 15 is arranged so that one diagonal line of the rhombus is aligned with the extension direction of the address electrode 13.

[0005]

By the way, in a PDP, one pixel is composed of three discharge cells each formed with a phosphor layer for generating visible light of red, green and blue, and the outer shape of one pixel is almost the same. In the case where the discharge cells 14 are arranged in a grid pattern as shown in FIG. 5, it is impossible to arrange three discharge cells at an equal interval within one pixel region. It is possible.

On the other hand, in the PDP shown in FIGS. 6 and 7 in which the discharge cells 14 are arranged in a staggered manner, it is easy to arrange three discharge cells 14 at equal intervals within one pixel region. However, even in this case, when the outer shape of the discharge cell 14 in a plan view is a square, the discharge cells 14 and 1 adjacent in the direction orthogonal to the extension direction of the address electrode 13 are also provided.
Assuming that the interval of 4 is 1, the interval between adjacent discharge cells 14 in the extension direction of the address electrode 13 is 1.5, and the three discharge cells 14 cannot always be arranged at the same distance.

In addition to such a demand, when the above-described exhaust passage is secured and the discharge cell 14 is further enlarged, as shown in FIGS. 6 and 7, the partition wall 15 is moved in the direction in which the address electrode 13 extends. The angle of the facing partition wall corner becomes a diamond having an acute angle of about 68 degrees.

In the manufacture of PDP, the partition 1
In the firing step of No. 5, the corners of the bulkhead tend to warp like bows of a ship, and this tendency becomes more remarkable as the angle of the corner of the bulkhead becomes sharper. Since the warpage generated at the corners of the partition walls becomes a projection, when the front substrate is bonded to the rear substrate 11 on which the partition walls 15 are formed, the protrusions at the corners of the partition walls come into contact with the front substrate and the corners of the partition walls are formed. There is a problem that concentrated load is applied to the portion, and chipping or cracking occurs in the partition wall 15, which causes a reduction in panel brightness. Further, when a part of the missing partition wall is mixed into the discharge cell 14,
There is a problem that display quality is deteriorated due to abnormal discharge or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to obtain a plasma display panel having good display quality while securing an exhaust passage for charging discharge gas.

[0010]

In order to achieve the above object, a plasma display panel according to claim 1 of the present invention has a back substrate and at least a discharge space surrounding the back substrate, each of which surrounds a discharge space. A plurality of partition walls defining a plurality of discharge cells by separating and forming a top surface of the partition walls, wherein the plurality of discharge cells are arranged in a staggered manner and have a plurality of discharge electrodes corresponding to the plurality of discharge cells. The display device further includes a front substrate opposed to the rear substrate, and the partition has a polygonal shape of a pentagon or more in plan view.

According to a second aspect of the present invention, there is provided a plasma display panel, comprising: a back substrate;
Each surrounding a discharge space, comprising a plurality of partition walls defining a plurality of discharge cells by separating and forming at least a partition top surface, the plurality of discharge cells are arranged in a staggered manner,
The liquid crystal display further includes a front substrate having a plurality of discharge electrodes corresponding to the plurality of discharge cells, and a front substrate disposed to face the rear substrate, wherein the partition is inclined at least partially inward toward an upper part in an upright direction, thereby forming a partition. The shape is such that the opening of the partition wall in plan view is narrowed.

According to a third aspect of the present invention, in the plasma display panel according to the second aspect, the outer shape of the partition wall in plan view is a polygon of five or more pentagons.

Further, the invention according to claim 4 is the plasma display panel according to any one of claims 1 to 3, wherein the front substrate is provided in a region other than the plurality of discharge cells. In most of the corresponding areas, a low-reflectance layer having a reflectance lower than that of the partition wall is further provided.

[0014]

FIG. 1 shows a plasma display panel (P) according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a schematic configuration of DP). This PDP
Includes a back substrate 1 and a front substrate 2 disposed opposite to the back substrate. As shown in the plan view of FIG. 2, a plurality of address electrodes 3 extending in the vertical direction of the panel are formed on the back substrate 1, and a plurality of address electrodes 3 are provided so as to straddle these address electrodes 3. The discharge cells 4 are arranged in a staggered manner. The plurality of discharge cells 4 are surrounded by a plurality of partition walls 5 each having an outer shape in which each discharge space is octagonal in plan view,
The plurality of partition walls 5 are independently separated from each other. As a result, an exhaust passage 6 for filling discharge gas is formed outside the partition wall 5. A phosphor film 7 is formed on the bottom surface of the discharge cell 4 surrounded by the partition wall 5 and on the inner wall surface of the partition wall 5. A dielectric layer, a protective film, and the like are additionally formed on the back substrate 1, but are not shown here.

On the back surface of the front substrate 2, a pair of discharge electrodes 8 facing each of the discharge cells 4 on the rear substrate 1 are arranged, and intersect (three-dimensionally) with the address electrodes 3 of the rear substrate 1. A plurality of metal electrodes 9 extending in the direction and connected to the corresponding discharge electrodes 8 are arranged. In addition, a black layer 10 having a low reflectance is formed in a portion other than a portion of the discharge electrode 8 serving as a light emitting region, that is, in a non-light emitting region in order to improve the contrast of the panel.

The specific outer shape of the partition wall 5 on the rear substrate 1 is an octagon in which long sides and short sides alternate by cutting four corners of a square to form short sides. The pair of short sides are arranged so as to face the extending direction of the address electrode 3, and the other pair of short sides is arranged so as to face a direction orthogonal to the address electrode 3.

The partition 5 is formed as follows. A low-melting glass is used as a material for the formation, but in a complicated partition structure as in the case of the present embodiment, sandblasting using a photo process is optimal.
First, a low-melting glass serving as a material for the partition walls 5 is uniformly applied to the rear substrate 1 with a predetermined thickness. In the photo process,
A mask is created by patterning a dry film resist or the like into substantially the same shape as the independent partition walls 5 before the firing step, and the low-melting glass is selectively processed by sandblast using the mask. After removing the mask,
By baking at a temperature of about 0 ° C., the partition walls 5 are formed. By this firing step, the volume of the partition walls 5 after firing is reduced to 60 to 90% of the volume before firing. When the partition structure is complicated as in this embodiment, the entire partition does not shrink uniformly in the firing step.

After the firing step, the height of the corners of the outer shape in plan view of the partition walls 5 is somewhat higher than in the other regions, so that the rear substrate 1 and the front substrate 2 are bonded using this step. In this case, a path for exhaust and gas filling can be secured over a wide range.

As a method of forming the black layer 10 on the back surface of the front substrate 2, a method of pattern-printing a glass paste containing a black material such as iron oxide or chromium oxide, or a method of applying a glass paste containing a photosensitive material to the glass paste is used. There is a method of forming a pattern in a region larger than the pattern and forming the pattern by a photo process.

In the PDP configured as described above, a predetermined voltage is applied between the discharge electrode 8 and the discharge cell 4 from the DC power supply via the metal electrode 9 and the address electrode 3, so that each discharge cell Discharge takes place inside 4. The ultraviolet light generated by the discharge causes the phosphor film 7 in the discharge cell 4 to emit light.
Emits light, and the light passes through the light emitting area of the front substrate 2 and is visually recognized by an observer.

According to this PDP, the angle of the corner of the partition wall 5 is obtuse (135 degrees in this case), so that the partition wall corner can be prevented from warping up in the baking step, and as a result, Since the partition walls 5 can be prevented from being damaged when the front substrate 2 is attached to the rear substrate 1,
Of the panel can be prevented from lowering due to damage to the panel. In addition, it is possible to avoid a decrease in display quality such as the occurrence of abnormal discharge due to a part of the missing partition wall 5 entering the discharge cell 4.

Further, an exhaust passage 6 for filling discharge gas is formed outside the partition 5 surrounding each discharge cell 4, and the external shape of the partition 5 in a plan view is made octagonal, so that the exhaust passage is secured and adjacent. Since the discharge space in the discharge cells 4 can be increased while satisfying conditions such as equalizing the distance between the discharge cells, the brightness of the panel is improved.

In this embodiment, the external shape of the partition wall 5 in plan view is octagonal. However, the present invention is not limited to this, and any other polygons may be used as long as the corners of the partition wall are obtuse angles. It may be something.

FIG. 3 is a perspective view showing the back substrate 1 side of another embodiment of the plasma display panel (PDP) according to the first embodiment of the present invention. In this example, the partition wall 5 has a regular hexagonal outer shape in a plan view, and is arranged such that a pair of opposing sides thereof face in the extension direction of the address electrode 3. Other configurations are the same as those shown in FIGS. 1 and 2.

<Second Embodiment> FIG. 4 is an exploded perspective view showing a schematic configuration of a plasma display panel (PDP) according to a second embodiment of the present invention. This PDP has a plurality of partitions 5 surrounding each discharge space of a plurality of discharge cells 4 formed on a back substrate 1. The paired sides are arranged so as to face the extension direction of the address electrode 3. Further, a plurality of discharge cells 4 are arranged in a staggered manner.

In particular, the partition wall 5 in this case is formed so that the entire periphery thereof is inclined inward toward the upper side in the upright direction so that the partition wall opening 5a in plan view becomes narrower than the lower half of the partition wall. I have to.

The entire periphery of the partition wall 5 is not limited to being inclined inward, but most portions may be inclined inward so that the partition opening 5a in plan view is narrowed. Further, it may be shaped like a pot. In short, it is only necessary that the partition wall 5 has a shape in which the partition wall opening 5a in plan view is narrowed. Other configurations are the same as those in the first embodiment.

In the PDP of the second embodiment, since the partition wall opening 5a in a plan view has a narrowed shape, the area occupied by the partition wall opening 5a, which is an outlet for visible light, is reduced.
Since the lower half of the partition wall is large, the discharge cell 4 can secure a sufficient internal space, and the amount of ultraviolet rays generated by the discharge does not decrease. Further, since the phosphor film 7 formed on the bottom surface of the discharge cell 4 and the inner wall surface of the partition wall 5 has a high visible light reflectance,
Most components of the visible light from the phosphor film 7 excited in the discharge cell 4 by ultraviolet rays are emitted from the partition wall opening 5a to the front surface of the panel while being repeatedly reflected in the discharge cell 4. For this reason, even if the occupied area of the partition opening 5a is reduced, the luminance of the panel can be maintained at a high level.

When the occupied area of the partition wall opening 5a is made the same, the brightness of the panel is further increased by further increasing the inward inclination of the partition 5 and increasing the volume of the internal space of the discharge cell 4. be able to. In addition, the fact that the partition wall opening 5a, which is a visible light outlet, is narrow means that a region other than the visible light outlet as viewed from the front of the panel is expanded, and this region is referred to as a visible light reflectance. (A material having a lower reflectance than the partition 5 at least), for example, a black layer, can reduce the reflectance of the entire panel. That is, the black layer 1 on the front substrate 2
Since the area of 0 can be increased accordingly, the contrast can be increased while maintaining high luminance.

The method of forming the partition walls 5 in this case is the same as that of the first embodiment, but the firing step reduces the volume of the partition walls after firing to 60 to 90% of that before firing,
Utilizing the fact that there is a portion that is likely to shrink depending on the shape of the partition wall before firing, even if the partition opening 5a and the bottom surface of the discharge cell 4 are set to the same area before firing, the shrinkage is caused by the firing process. By forming the partition wall 5 with an easy material, it is possible to relatively easily obtain a shape in which the partition wall opening 5a is contracted from the lower half of the partition wall.

In the present embodiment, the outer shape of the partition wall 5 in plan view is rhombic, but may be a polygon having five or more polygons as in the first embodiment. In this case, not only high contrast can be obtained due to the narrow partition opening 5a, but also damage to the partition 5 can be prevented, and the discharge in the discharge cell 4 can be performed while securing the exhaust passage 6 for filling discharge gas. Since the space can be increased, the luminance of the panel can be improved.

Further, in the first and second embodiments, an example is shown in which the entire partition wall 5 is formed separately from the other partition walls 5.
The same effect can be obtained if at least the top surface of the partition wall 5 is formed separately from the top surfaces of the other partition walls 5.

[0033]

As described above, in the plasma display panel according to the first aspect of the present invention, the external shape in plan view of the partition formed by separating at least the top surface of the partition from the other partition is a polygon having a pentagon or more. By doing so, a relatively large discharge space in the discharge cell can be secured while preventing damage to the partition walls, so that the brightness of the panel can be improved while securing an exhaust passage for filling discharge gas.

In the plasma display panel according to the second aspect of the present invention, the partition space in which at least the partition wall top surface is formed separately from the other partition walls is formed into a shape in which the partition opening is narrowed in a plan view, so that the discharge space in the discharge cell is reduced. Since the visible light extraction area can be reduced while maintaining the area, and the area other than the partition opening can be widened, the contrast can be increased while maintaining high luminance.

Further, in the plasma display panel according to the third aspect of the present invention, since the external shape of the partition walls in plan view is a polygon of pentagon or more, a relatively large discharge space in the discharge cell is secured while preventing the partition walls from being damaged. Therefore, it is possible to improve the brightness of the panel while securing an exhaust passage for charging discharge gas.

Further, the front substrate of the plasma display panel according to claim 4 further comprises a low-reflectance layer having a reflectance lower than that of the partition walls in most regions corresponding to regions other than the plurality of discharge cells. The contrast can be further increased while maintaining high luminance.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a plasma display panel according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of a rear substrate in the plasma display panel.

FIG. 3 is a perspective view of a rear substrate according to another mode of the first embodiment.

FIG. 4 is an exploded perspective view of a plasma display panel according to Embodiment 2 of the present invention.

FIG. 5 is a perspective view showing a main part of a conventional example.

FIG. 6 is a plan view showing another conventional back substrate.

FIG. 7 is a perspective view of the rear substrate.

[Explanation of symbols]

Reference Signs List 1 back substrate, 2 front substrate, 4 discharge cells, 5 partition, 5a partition opening, 7 phosphor film, 8 discharge electrode,
10 Black layer.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shigeki Harada 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C040 FA01 FA04 GB03 GB14 GF03 GF12 GF14 GH06 LA11 MA03 MA10

Claims (4)

[Claims] 1. A back substrate, comprising: a plurality of partition walls, each of which surrounds a discharge space and defines a plurality of discharge cells by forming at least a top surface of the partition walls separately, on the back substrate; The discharge cells are arranged in a zigzag pattern, and further include a front substrate having a plurality of discharge electrodes corresponding to the plurality of discharge cells and disposed opposite to the rear substrate, wherein the partition has a pentagonal or larger outer shape in plan view. A plasma display panel having a polygonal shape. 2. A back substrate; and a plurality of partition walls, each surrounding a discharge space and defining a plurality of discharge cells by forming at least a top surface of the partition walls separately, on the back substrate. Wherein the discharge cells further comprise a front substrate having a plurality of discharge electrodes corresponding to the plurality of discharge cells, and a front substrate disposed to face the rear substrate, wherein the partition walls are at least partially extended upward in the upright direction. A plasma display panel, characterized in that the partition walls are inclined inward so that the partition walls have a shape in which the partition wall openings are narrowed in plan view. 3. The plasma display panel according to claim 2, wherein the outer shape of the partition wall in plan view is a polygon of five or more pentagons. 4. The plasma display panel according to claim 1, wherein the front substrate is provided in a most area corresponding to an area other than the plurality of discharge cells. A plasma display panel, further comprising a low reflectance layer having a reflectance lower than that of the partition.