JPH11283513A - Substrate for plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bury shape defectives with a melted upper layer, even if the shape defectives are generated in a partition to prevent the cut out of the partition by constituting an upper layer part of the partition with a material, having lower softening point or melting point than a material of a lower layer part. SOLUTION: A back plate 1 is an insulating substrate made of soda-lime glass or ceramics, has a plurality of partitions 2 and an address electrode 3 formed between the partitions 2, and a space between the partitions 2 is used as a display cell 5. The partition 2 constituting the display cell 5 is coated with phosphors, and a face plate with a discharge electrode is jointed to form a panel. Since an upper layer part 2a is easily melted than a lower layer part 2b in a heat treatment process of the partition 2, even if the cut out is generated in the partition 2, it is buried with the melted upper layer part 2a to prevent the generation of the cutout of the partition 2. To conduct the restoration of the shape, the thickness of the upper layer part 2a is desirably 5-30% of the overall thickness of the partition 2. By setting the softening point or melting point of the upper layer part 2a to the same as or slightly lower than that treatment temperature in a panel sealing process, the adhesive force with the face is enhanced.

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 a PDP) used for a high-precision, inexpensive, thin, large-screen color display device and the like, and a method of manufacturing the same. is there.

[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 a high voltage is required. (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. 4, such a PDP has a small discharge display cell 5 surrounded by a pair of flat insulating substrates forming a back plate 1 and a front plate 6 and a partition 2 partitioning a space therebetween. And a pair of discharge electrodes 7 and an address electrode 3 at the bottom for generating plasma by discharge between the discharge electrodes 7 and performing light emission switching of the discharge display cells 5. 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 is performed by ultraviolet light emitted from the plasma. The phosphor 4 formed on the inner wall of the display cell 5 emits light and is used as a light emitting element of an image display device.

A specific structure is such that a large number of partitions 2 are formed parallel to one surface of a back plate 1 and discharge display cells 5 are provided between the partitions 2.
An address electrode 3 is provided at the bottom of the discharge display cell 5. The phosphor 4 is applied to the inner surface of the discharge display cell 5,
On the other hand, a front plate 6 provided with a transparent electrode as a discharge electrode 7 is joined on the partition 2 and a rare gas is sealed in the discharge display cell 5 to constitute a PDP.

There are generally two types of materials for the partition walls 2, a white type and a black type, and the use of a white type material having a high visible light reflectance is expected to improve the luminance. In order to improve the contrast, a black material is used in order to prevent mixing of display colors due to light leakage from the adjacent discharge display cells 5.

In view of this, it is also practiced to form the partition 2 into a two-layer structure, using a white material for the lower layer and a black material for the upper layer.

[0008]

However, the above P
The DP substrate is subjected to a heat treatment step for the partition 2 at the time of manufacture, and the partition 2
Is apt to cause shape defects such as cuts at unspecified locations,
Therefore, there is a problem that the discharge space is widened and image display is disturbed.

When manufacturing the partition 2 having the two-layer structure, a similar heat treatment step is performed to remove the white material and the black material.
There is also a problem that the layers are mixed and the contrast cannot be improved.

[0010]

SUMMARY OF THE INVENTION The present invention provides a plasma display device substrate comprising a plurality of partitions on a substrate and a plurality of address electrodes disposed between the partitions.
The upper layer of the partition is made of a material having a softening point or a melting point lower than the material of the lower layer.

That is, according to the present invention, in the heat treatment step of the partition wall at the time of manufacturing, the upper layer portion of the partition wall is more easily melted. By filling the defective shape part,
This can prevent the partition from being cut.

In addition, since the upper layer has a lower melting point or softening point than the lower layer, the lower layer does not melt in the heat treatment step of the upper layer, so that mixing of the two layers can be prevented. Therefore, in the present invention, in the above-described PDP substrate, the colors of the upper layer and the lower layer of the partition walls are made different from each other to prevent the colors of both layers from being mixed in the manufacturing process.

Further, the present invention provides a plasma display device substrate comprising a plurality of partition walls on a substrate and a plurality of address electrodes disposed between the partition walls, wherein colors of upper and lower layers of the partition walls are provided. And a non-melting layer is provided between the two.

That is, by providing a non-melting layer having a higher melting point or softening point than these layers between the two layers, mixing of the colors of the two layers in the manufacturing process is prevented.

Therefore, by using a black material (including a cool color material) for the upper layer portion and using a white (including a warm color material) for the lower layer portion, the contrast and brightness can be improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a PDP substrate according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the back plate 1 is an insulating substrate made of soda lime glass or various ceramics.
A plurality of barrier ribs 2 and address electrodes 3 are formed between the barrier ribs 2 on the back plate 1, and the space between the barrier ribs 2 serves as a discharge display cell 5.

Then, the partition walls 2 constituting the display cell 5 are formed.
A phosphor is applied to the PDP and a front plate 6 provided with a discharge electrode 7 as shown in FIG.

Here, the partition 2 is formed of an upper layer 2a and a lower layer 2b made of different materials. The upper layer 2a is formed of a material having a lower softening point or melting point than the material forming the lower layer 2b.

Here, the softening point or melting point refers to a temperature at which the above-mentioned material starts to soften or melt, and also from a manufacturing point of view, a heat treatment temperature at the time of hardening the partition wall 2.

For this reason, when manufacturing the PDP substrate, the upper layer 2a is more likely to be melted in the heat treatment step of the partition 2, so that even if the partition 2 has a defective shape, the upper layer 2a is melted. As a result, it is possible to prevent the partition walls 2 from being cut or the like.

In order to provide such a shape repairing function, the thickness of the upper layer 2a must be 5 to 30% of the whole of the partition 2.
It is preferable to keep it within the range of

In particular, if the softening point or melting point of the upper layer portion 2a is set to be about the same as or slightly lower than the heat treatment temperature in the panel sealing step of joining the front panel 6, the upper layer section 2a can be formed in this panel sealing step. The portion 2a is melted, and the adhesive strength with the front plate 6 can be increased.

Further, in this PDP substrate, the upper layer 2a and the lower layer 2b of the partition 2 can have different colors. In this case, since the softening point or melting point of the upper layer 2a is lower than that of the lower layer 2b, first, the lower layer 2b is formed, then the upper layer 2a is formed, and the lower layer 2a is subjected to a heat treatment step for the upper layer 2a. Since 2b does not melt, mixing of the colors of both layers can be prevented.

Therefore, a black (including a cool color) material is used for the upper layer 2a, and a white (including a warm color) material is used for the lower layer 2b.
By using a material, the colors of both layers can be prevented from being mixed at the time of manufacturing, and the contrast and the luminance can be improved.

Next, another embodiment of the present invention will be described.

The PDP substrate shown in FIG. 2 has the same structure as that of the above embodiment, except that the upper layer 2a and the lower layer 2b of the partition wall 2 are provided.
And a non-melting layer 2c having a softening point or a melting point higher than these. In this embodiment, since the unmelted layer 2c does not melt even in the heat treatment step at the time of manufacturing, it is possible to prevent the colors of the upper layer 2a and the lower layer 2b from being mixed.

The method of manufacturing the PDP substrate is as follows.

First, as shown in FIG.
The lower layer 2b of the partition 2 is formed on the substrate. As this forming method, any method such as a conventional printing lamination method, a sand blast method, or a method of molding using a molding die may be used. Next, the non-molten layer 2c is formed on the upper surface of the lower layer 2b by vacuum deposition, sputtering, spray coating, or the like.
To form

The upper layer 2a is formed on the unmelted layer 2c. Specifically, as shown in FIG. 3A, a partition material 11 for the upper layer 2a made of a mixture of ceramics or glass, a solvent, and an organic additive is applied to the application plate 10 beforehand. If the plate 10 is placed on the unmelted layer 2c and the coating plate 10 is separated as shown in FIG.
The upper part 2a can be formed on the non-melted layer 2c.

Alternatively, as shown in FIG. 3C, a partition material 11 is applied to the surface of
The upper layer 2a can also be formed by rolling while applying 2 on the non-melted layer 2c.

Finally, the whole is fired. In this step, since the non-melted layer 2c does not melt, the upper layer 2
a can be prevented from being mixed with the color of the lower layer portion 2b.

In order to improve the contrast and the brightness, it is sufficient to use a black material (including a cool color material) for the upper layer 2a and a white (including a warm color) material for the lower layer 2b. It is preferable that the thickness of 2a is in the range of 5 to 30% of the entire partition 2.

The material of the partition walls 2 that can be used in the present invention may be any glass material, ceramics, or a mixture thereof, which becomes vitreous after firing and can maintain airtightness. For example, a mixture of a low-melting glass powder and an oxide ceramic powder or the like can be used as an inorganic component, and a mixture of the inorganic component, a solvent, and an organic additive is appropriately added to the molding conditions of the partition wall 2 and the dielectric layer 8. It can be prepared and used accordingly.

As the above ceramics, any of oxide ceramics such as alumina and zirconia, and non-oxide ceramics such as silicon nitride, aluminum nitride and silicon carbide can be used. Binders can also be added.

As the low melting point glass powder, various glass materials containing silicate as a main component and containing one or more of lead, sulfur, selenium, alum and the like can be used.

The ceramic or glass powder may have a particle size of several tens of microns to sub-micron, and specifically, 0.2 to 10 μm, preferably 0.2 to 5 μm. Range is desirable. In order to make the colors of the upper layer 2a and the lower layer 2b different from each other, for example, both are formed of the same material, and 0.5 to 5 parts by weight of a coloring agent such as chromium oxide or iron oxide is added to the upper layer 2a. Just do it. Note that the upper layer 2a and the lower layer 2b do not need to be formed of the same material, but it is preferable that both are made of materials having similar thermal expansion coefficients.

The solvent is not particularly limited as long as it is compatible with the organic additive, and two or more solvents may be used in combination to slowly evaporate the solvent. is there. As the organic additive, a thermoplastic resin or a reactive curable resin such as an ultraviolet curable resin, a photocurable resin, and a thermosetting resin can be used. Others include dispersants, release agents, curing agents,
Various organic substances such as a lubricant and a plasticizer can be exemplified.

Further, as the substrate used as the back plate 1 of the present invention, a transparent glass substrate such as soda lime glass, low soda glass, lead alkali silicate glass, borosilicate glass or the like can be used. It is desirable that the expansion coefficients are similar. Particularly, high strain point low soda glass is suitable.

The address electrodes 3 on the back plate 1 are made of silver (Ag), nickel (Ni), aluminum (A
1) or the like, or an alloy thereof, or a conductive paste in which a small amount of glass is mixed with the conductor metal or its alloy.

Further, at the interface between the partition 2 and the back plate 1, any of an inorganic adhesive and an organic adhesive can be used. For example, a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent can be used. Among them, a highly reactive silane coupling agent is preferable.

[0042]

Embodiment 1 An embodiment of the present invention will be described below.

First, a glass or ceramic powder as shown in Table 1 and various solvents, an organic additive, and a slight dispersant were added to the lower layer 2b of the partition 2 to form a spine made of a glass substrate. It was formed on the face plate 1. The glass powder has an average particle diameter of 0.2 to 10 μm, and the ceramic powder has an average particle diameter of 0.2 to 5 μm.

The lower layer 2b is formed on the back plate 1 by a conventional printing lamination method or a sand blast method.

Next, similarly, the materials shown in Table 1 are used for the upper layer 2a, which are applied on the coating plate 10 or the roll 12, and are pressed against the tip of the lower layer 2b to form the upper layer 2a. Was formed. After that, 50 using glass
0-700 ° C, 1450 using ceramics
The whole was heat-treated at １1600 ° C. to produce a PDP substrate.

The combinations of the materials of the lower layer 2b and the upper layer 2a are as shown in Table 2. On the other hand, as a comparative example, one in which the partition walls 2 were formed of the same material was also prepared.

With respect to the sample obtained as described above,
Table 2 shows the results of observing the shape of the partition walls 2 and the presence or absence of shape defects (cuts at unspecified locations).

As a result, in the comparative example, a shape defect is generated as a whole, and in the case of a combination in which the upper layer portion 2a and the lower layer portion 2b have the same softening point or melting point, the shape repair effect described above is poor, and the shape defect is poor. Slightly occurred.

On the other hand, according to the combination of the present invention in which a material having a softening point or a lower melting point than that of the lower layer portion 2b is used for the upper layer portion 2a, the shape restoration effect described above does not cause a shape defect and a good partition wall shape. Met.

When each of the above samples was sealed to the front plate 6, the airtightness of the panel was better in the example of the present invention than in the comparative example.

[0051]

[Table 1]

[0052]

[Table 2]

Example 2 Next, in the same manner as in Example 1, a lower layer 2b was formed from various materials shown in Table 1, and heat-treated at about 500 ° C. for glass and about 1450 to 1600 ° C. for ceramics. did. An unmelted layer 2c made of SiO ₂ was formed thereon by a sputtering method.

An upper layer 2a is formed on the non-melted layer 2c by adding 3% by weight of chromium oxide as a coloring agent to the various materials shown in Table 1. In the case of glass, the upper layer 2a is formed.
In the case of ceramics, heat treatment was performed at 1450 to 1600 ° C. to form the partition 2.

The combinations of the materials of the lower layer 2b and the upper layer 2a are as shown in Table 3. On the other hand, as a comparative example, one without the non-melted layer 2c was also prepared.

With respect to the sample obtained as described above,
Table 3 shows the results of observing the shape of the partition 2 and the presence or absence of a boundary between the upper layer 2a and the lower layer 2b.

From the results, the boundary between the upper layer 2a and the lower layer 2b was unclear in the comparative example, whereas the boundary was clear in the embodiment of the present invention, and the intersection of the upper layer 2a and the lower layer 2b was found. There was no. In addition, when the softening point or the melting point of the upper layer 2a is lower than that of the lower layer 2b, a favorable partition shape was obtained due to the shape restoration effect described above.

[0058]

[Table 3]

[0059]

As described above, according to the substrate for a PDP of the present invention, since a material having a softening point or a melting point lower than that of the lower layer portion is used as the upper layer portion of the partition wall, shape defects do not occur. A good partition can be obtained, and even when the colors of the upper layer portion and the lower layer portion are made different, mixing of both can be prevented.

Further, according to the present invention, the colors of the upper layer and the lower layer of the partition walls are different from each other, and the non-melting layer is formed between the two, whereby the mixing of the upper layer and the lower layer can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing another embodiment of the PDP substrate of the present invention.

3A to 3C are schematic cross-sectional views illustrating a method for manufacturing a PDP substrate according to the present invention.

FIG. 4 is a sectional view of a main part of a general PDP.

[Explanation of symbols]

 1: back plate 2: partition wall 2a: upper layer portion 2b: lower layer portion 2c: non-melting layer 3: address electrode 4: phosphor 5: display cell 6: front plate 7: discharge electrode 10: coating plate 11: partition wall material 12: roll

Claims (2)

[Claims] 1. A plasma display device substrate comprising: a plurality of partition walls on a substrate; and a plurality of address electrodes disposed between the partition walls, wherein an upper layer of the partition walls is made of a material constituting a lower layer section. A substrate for a plasma display device, comprising a material having a lower softening point or melting point. 2. A plasma display device substrate comprising a plurality of partition walls on a substrate and a plurality of address electrodes disposed between the partition walls, wherein the upper and lower layers of the partition walls have different colors. A substrate for a plasma display device, comprising a non-melting layer between the two.