JPH11250797A - Substrate for plasma display device and method of manufacturing the same - Google Patents

Abstract

(57) Abstract: A plasma display device substrate comprising a plurality of partition walls 2 on a back plate 1 and a plurality of address electrodes 3 disposed therebetween, without lowering the brightness of the panel. Improve the contrast ratio. A black layer (8) is provided on an upper part of the partition (2), and an angle between a side surface of the partition (2) and a side surface of the black layer (8) is 100 to 100.
180 °.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate for a plasma display device (plasma display panel: hereinafter referred to as "PDP") and a method of manufacturing the same.

[0002]

2. Description of the Related Art A CRT, which has been widely used as an image display device, has a disadvantage that it has a large volume and weight and requires a high voltage. LE
D), a liquid crystal display element (LCD), or a flat-panel image display device having features such as a large screen such as a PDP, a high-quality image, a thin and light-weight, and any installation location are developed. I am doing it.

[0003] As such a flat image display device, in particular, a PDP utilizing plasma emission has attracted attention as a light emitting element of a color image display device for a large screen.

As shown in FIG. 6, such a PDP includes a pair of flat insulating substrates forming a back plate 1 and a front plate 6 and a small discharge display cell 5 surrounded by a partition 2 partitioning the space. Each of the pair of discharge electrodes 7 and, at the bottom thereof, an address electrode 3 for generating plasma by discharge between the discharge electrodes 7 and performing light emission switching of the discharge display cell 5 are provided. A gas is hermetically sealed, a voltage is selectively applied between the address electrode 3 and the discharge electrode 7 to generate plasma by discharge, and discharge display is performed by ultraviolet light emitted from the plasma. The phosphor 4 formed on the inner wall of the cell 5 emits light and is used as a light emitting element of an image display device.

As a specific structure, a large number of partitions 2 are formed parallel to one surface of the back plate 1, and a discharge display cell 5 is formed between the partitions 2. Prepare. The phosphor 4 is applied to the inner surface of the discharge display cell 5, while a front plate 6 having a transparent electrode as the discharge electrode 7 is joined on the partition 2, and a rare gas is sealed in the discharge display cell. , PDP.

[0006] PDP is a very promising display as a wall-mounted television because it is thin and lightweight and has a large screen. However, at present, there are still many problems such as lower luminance and contrast ratio and higher power consumption than CRT.

As one of the measures for improving the contrast ratio, a black layer is provided on the top of the partition wall to suppress the reflection of external light, thereby improving the contrast ratio (see Japanese Patent Application Laid-Open No. 5-299022). ).

Generally, a printing method, a photosensitive paste method, or the like is used as a method for forming the black layer.

As for the printing method, as shown in FIG. 7, a black paste 10 is applied to a back plate 1 on which a partition 2 and an address electrode 3 are formed by a squeegee 11 using a printing plate making 12 having a partition pattern. 2 formed on the top.

[0010] As shown in FIG.
A layer of a black photosensitive paste 13 is formed on the back plate 1 on which the partition walls 2 and the address electrodes 3 are formed, an exposure mask 14 having a partition pattern is applied thereto, and an exposure process is performed. The black layer 8 is formed on the partition 2 by removing it by a treatment or the like.

[0011]

However, the shape of the black layer formed by any of the methods is not appropriate, and sagging particularly occurs on the side wall of the partition wall.
The opening area of the display cell was reduced, resulting in a decrease in panel luminance. Further, if the alignment with the top of the partition wall is shifted, the opening area between the partition walls becomes small, which leads to a decrease in the brightness of the panel. Therefore, high alignment accuracy is required and the productivity is not excellent.

Particularly, in the printing method, since the pressure is applied under pressure, the black paste is applied to the side surfaces of the partition walls, and there is a problem that the opening area between the partition walls is narrowed. Since a large amount of the photosensitive paste is removed, there is a problem in economy.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a PDP substrate provided with a black layer having an appropriate shape for improving a contrast ratio and a productivity thereof. It is to provide an excellent manufacturing method.

[0014]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above-mentioned problems, and as a result, as a method of forming a black layer on the upper part of the partition, a pattern larger than the area where the partition exists, and having no pattern (hereinafter referred to as solid surface) The paste is held in a paste holder such as a mesh, and the mesh is brought into contact with the top of the partition formed in advance, so that a suitable alignment is required only at the top of the partition without high alignment accuracy. It has been found that a black layer having a shape can be formed.

That is, a PDP substrate of the present invention is a plasma display device comprising a plurality of partitions on a back plate and a plurality of address electrodes disposed therebetween, wherein a black layer is provided on the partition. The angle between the side wall of the partition and the side surface of the black layer is 100 to 180 ° or less.

In the PDP substrate, after a plurality of partitions are provided on a back plate and a plurality of address electrodes are provided therebetween, a paste holder holding a black paste is placed on top of the partitions. This is a production method characterized by forming a black layer by contacting, and using a mesh finer than No. 80 (number of meshes per inch) as a paste holder for filling the black paste. The viscosity of the black paste is 500 to 5
000 poise.

[0017]

According to the method of manufacturing a PDP substrate of the present invention, by using a paste holder such as a solid mesh,
Fine positioning with a partition formed in advance is not required. Furthermore, by making the mesh size finer than 80, surface irregularities due to mesh lines are prevented, and paste viscosity of 500 poise or more prevents sagging on the side, and 5000 poise or less improves coatability on the top of the partition wall. It can be maintained and a black layer having an appropriate shape can be formed. As a result, the contrast ratio can be improved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a main part of a partition wall of a PDP substrate according to the present invention, and FIG. 2 is an enlarged view of a top part of the partition wall. The PDP substrate shown in FIG. 1 includes a partition 2 provided in parallel with the back plate 1, a black layer 8 formed on the partition 2, and a partition 2.
Display cells 5 partitioned by the discharge display cells 5
It comprises an address electrode 3 and a phosphor 4 provided therein. Also, a front panel 6 as shown in FIG. 6 can be joined to the substrate to form a PDP.

Next, a method of manufacturing a PDP substrate according to the present invention will be described with reference to FIG. First, as shown in FIG. 3A, the black paste 10 is evenly spread and filled into the mesh 9 serving as the paste holder using a squeegee 11 at a predetermined speed and pressure.

Next, as shown in FIG. 3B, a mesh filled with the black paste 10 is brought into contact with the top of the partition 2, and then the mesh 9 is removed from the partition 2 as shown in FIG. Then, the black layer 8 is formed on the top of the partition 2. Thereafter, baking is performed under predetermined conditions to obtain the PDP substrate of the present invention.

The paste holding member is not limited to the mesh 9 but may be a sheet-like member holding the paste, and a cloth or the like may be used.

By using such a method, the angle θ between the side surface of the partition 2 and the side surface of the black layer 8 shown in FIG.
The black layer 8 having an appropriate shape as described below can be formed. As a result, the opening area of the discharge display cell 5 can be maximized, and the contrast ratio can be improved without lowering the luminance.

If the angle θ exceeds 180 °, the opening area of the discharge display cell 5 is reduced, leading to a decrease in luminance. If the angle θ is smaller than 100 °,
The thickness of the black layer 8 becomes thin, and the effect of improving the contrast ratio becomes poor. Therefore, the side surface of the partition 2 and the black layer 8
Is preferably in the range of 100 to 180 °.

Black paste 10 used for black layer 8
May be a paste of a generally used black low-melting glass having a softening point of 400 ° C. to 600 ° C., and is not particularly limited. The material of the mesh 9 used for forming the black layer 8 may be any material as long as it is not affected by the solvent contained in the black paste 10 such as stainless steel. Furthermore, by eliminating the mesh pattern and adopting a solid surface that fills the entire surface with the black paste 10, if the mesh 9 is displaced enough to cover the entire partition 2, the black paste 10 is applied to the top of the partition 2. This makes it possible to obviate the need for delicate alignment of up, down, left, and right inclinations, which was required in the printing plate making 12 used in the conventional printing method.

The mesh size of the mesh 9 is set to 80
It is preferable to make the number smaller than the number. The mesh size of 80 means that the number of eyes per inch is 80. By making the mesh size smaller than No. 80, the mesh wire diameter can be made thinner, unevenness due to traces of the mesh wire can be suppressed, the adhesion to the front plate increases, and discharge leakage can be prevented. If it is coarser than No. 80, the paste-holding property is deteriorated and a proper black layer cannot be formed. If it is finer than No. 500, clogging with the paste occurs and proper formation cannot be performed.

The viscosity of the black paste 10 is 5
It is preferable that the range be from 00 poise to 5000 poise. If the viscosity is lower than 500 poise, dripping occurs due to its fluidity. If the viscosity exceeds 5000 poise, the black paste 10 is more likely to remain on the mesh 9 and any of them cannot be properly formed.

The partition 2 is made of a low melting point glass such as lead borosilicate glass, and the back plate 1 is made of soda lime glass or various ceramics.

[0029]

Next, the PDP substrate of the present invention and its manufacturing method were evaluated as follows.

Comparative Example First, a back plate 1 made of a high strain point low soda glass having a thickness of 2.8 mm and a size of 40 inches.
The address electrode 3 having a width of 100 μm was formed by a thick film printing method using an electrode paste containing Ag as a main component at 220 μm.
After being formed in a stripe shape at an m pitch, the back plate 1 with the address electrodes 3 was obtained by baking.

A 150 μm thick film is formed on the obtained back plate 1 with address electrodes 3 using a coater machine, and after drying,
Form a partition pattern on the film using a photosensitive resin, exposure,
develop. Then, after forming the partition 2 by sandblasting, the resin was removed.

The viscosity of the paste is 1000
Poise, plate making mesh size 325, printing plate making 12 with the same mask pattern as the top shape of partition 2
The black layer 8 was provided by a printing method using.

Example 1 A partition 2 was obtained in the same manner as in the comparative example, and a plate having a paste viscosity of 1000 poise, a mesh size of 325 and a solid surface was used on the top. First, the squeegee 11 fills the mesh 9 with the black paste 10. Mesh 9 filled with this black paste 10
Was brought into contact with the partition wall 2 and the black paste 10 was transferred to form a black layer 8 on the partition wall 2.

Next, the PDP of Comparative Example and Example 1 of the present invention
The method for forming the black layer 8 of the present invention was evaluated for the substrate for use as follows.

From the cross section of the upper part of the partition 2, the shape of the applied black paste 10 was observed using a scanning microscope. FIG.
Shows a comparative example, and FIG. 5 shows an example of the present invention.

From the results, in the comparative example shown in FIG. 4, the paste 10 was dripped on the side surfaces of the partition walls 2 due to the application by the printing method, and the opening area between the partition walls 2 was reduced, leading to a decrease in panel brightness. It was something that would. On the other hand, in the coating method according to the present invention, it is possible to apply only on the tops of the partition walls 2 and to reduce the opening area between the partition walls 2 and contribute to the improvement of the contrast ratio without leading to a decrease in panel brightness. did it.

Regarding the alignment at the time of forming the black layer 8, in the printing method of the comparative example, after setting the substrate in the printing machine,
It took a lot of time to adjust the alignment. On the other hand, in the coating method according to the present invention, fine positioning was not required, and thus the process could be completed in a short time. In addition, as compared with a conventional forming method that requires exposure, such as a photosensitive paste method, the manufacturing method of the present invention can significantly reduce the number of steps.

(Examples 2 to 16) After the partition walls 2 were obtained in the same manner as described above, the black layer 8 was formed on the top portion with a paste viscosity of 400 to 6000 poise, a mesh size of 60 to 500, and a plate making of a solid surface. The formation was performed. First, the mesh 10 filled with the paste 10 is filled in the mesh 9 with the squeegee 11, the mesh 9 filled with the paste 10 is brought into contact with the partition 2, and the paste 10 is transferred to form the black layer 8 on the partition 2. did.

With respect to the PDP substrate thus obtained, the sagging of the black layer 8 on the side surface, the surface smoothness, and the top coatability were evaluated.

As for the sag on the side surface, the angle θ between the side surface of the partition 2 and the side surface of the black layer 8 is 175 ° or less.
75 ° to 180 ° was defined as Δ, and those having an angle θ exceeding 180 ° were defined as x. Regarding the surface smoothness, the black layer 8 was evaluated as ○ when there was no mesh mark, and the black layer 8 was evaluated as x when there was a mesh mark. Regarding the applicability on the top, ○ indicates that there was no leakage of the black paste 10, and X indicates that there was leakage.

The results are as shown in Table 1. According to this result, when the mesh size is larger than 80, the surface smoothness is deteriorated due to unevenness due to the mesh traces, and discharge leakage occurs. On the other hand, when the paste viscosity is less than 500 poise, side sagging occurs, the opening area between the partition walls is reduced, and the brightness of the panel is reduced. On the other hand, if the paste viscosity is more than 5000 poise, the applicability to the top is deteriorated, and the contrast ratio in the panel surface varies.

Therefore, the paste viscosity is 500-5000.
It turned out that the poise and the mesh size should be 80 to 500.

[0043]

[Table 1]

[0044]

As described above, in the method of manufacturing a PDP substrate of the present invention, the black paste is held on a paste holder such as a solid mesh, and the black paste is brought into contact with the top of the partition wall to precisely position the paste. An appropriate shape without narrowing the opening area between the partitions can be obtained only at the top of the partitions without the need for alignment. As a result, it is possible to improve the contrast ratio without lowering the luminance of the panel.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a PDP substrate of the present invention.

FIG. 2 is an enlarged cross-sectional view of a partition top in FIG.

3 (a) to 3 (c) are schematic views showing a method for manufacturing a PDP substrate according to the present invention.

FIG. 4 is a cross-sectional view showing a shape of a black layer of a PDP substrate manufactured by a conventional printing method.

FIG. 5 is a cross-sectional view illustrating a shape of a black layer of a PDP substrate according to a manufacturing method of the present invention.

FIG. 6 is a partial cross-sectional view of a general PDP.

FIGS. 7A and 7B are schematic diagrams showing a method for forming a black layer by a printing method.

FIGS. 8A to 8C are schematic views showing a method for forming a black layer by a photosensitive paste method.

[Explanation of symbols]

 1: Back plate 2: Partition wall 3: Address electrode 4: Phosphor 5: Display cell 6: Front plate 7: Discharge electrode 8: Black layer 9: Mesh 10: Black paste 11: Squeegee 12: Plate making 13: Black photosensitive Paste 14: Exposure mask

Claims (3)

[Claims] 1. A plasma display device substrate comprising a plurality of partition walls on a back plate and a plurality of address electrodes disposed therebetween, comprising a black layer on top of the partition walls, wherein the side walls of the partition wall and the black The angle between the layer and the side is 100 to 18
A substrate for a plasma display device, which is at 0 °. 2. A method according to claim 1, wherein a plurality of partition walls and a plurality of address electrodes disposed between the plurality of partition walls are provided on a back plate, and a paste holder holding a black paste is brought into contact with the top of the partition wall to form a plurality of partition walls. A method for manufacturing a substrate for a plasma display device, comprising a black layer on an upper part. 3. The paste holder according to claim 2, wherein the paste holder is made of a mesh finer than size 80 (the number of meshes per inch), and the viscosity of the black paste to be filled is 500 to 5000 poise. Of manufacturing a substrate for a plasma display device.