JPH10302616A - Substrate for plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently apply a phosphor on the inner wall surface of a barrier rib by forming the barrier rib on a back plate consisting of ceramic or glass by a mixture of ceramic powder or glass powder with a binder, and cutting vertical phosphor holding grooves on the inner wall surface of the barrier rib to hold the phosphor. SOLUTION: A plurality of barrier ribs 3 consisting of ceramic or glass are provided on one surface of a back plate 2 consisting of ceramics or glass, and a cell 4 is formed between each of the barrier ribs 3. An electrode 5 is provided on the bottom surface of the cell 4, and a phosphor is applied to the inner wall surface 6 of the cell 4. In the application of the phosphor, vertical phosphor holding grooves 21 are provided on the inner wall surface 6 so that the phosphor can be sufficiently held without dripping. The holding grooves 21 can be formed at low cost without requiring any special process by simultaneously forming them when the barrier ribs 3 are vertically released from the circumferential grooves of a roll in the formation of the barrier ribs 3 by the roll.

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 used for a high-precision and inexpensive large-screen color display device or the like.

[0002]

2. Description of the Related Art In a plasma display device used for a thin large-screen color display device or the like, opposed electrodes are provided in a space surrounded by partition walls called minute display cells, and discharge of rare gas or the like is performed in the space. It has a structure in which possible gas is sealed, and generates plasma by discharging between facing electrodes,
The phosphor emits light by the plasma and is used as a light emitting element of a screen.

As a specific structure, as shown in FIG. 10, a large number of partitions 102 are formed on one surface of a back plate 101 to form a cell 103 between the partitions 102, and an electrode 104 is provided on the bottom surface of the cell 103. This is referred to as a substrate 105. This substrate 1
On the other hand, a phosphor is applied to the inner wall surface 106 of the cell 103 while the front plate 108 having the electrode 107 is
The plasma display device is constructed by joining the cell 103 on the partition wall 05 and filling gas into the cell 103. Although the electrodes 104 and 107 are actually arranged so as to be orthogonal to each other, they are arranged in parallel in the figure for explanation.

When manufacturing the substrate 105 for the plasma display device, a large number of electrodes 104 are formed on the back plate 101 in advance, and then a partition 106 is formed between the electrodes 104.
As a method for manufacturing the partition 106, a printing lamination method, an additive method, a sand blast method, and a photosensitive paste method are known. The printing lamination method uses the partition 102
The partition 102 having a predetermined pattern is formed on the back plate 101 by printing using a thick film printing method by using a paste of a material forming the following. Since the thickness that can be formed by one printing is about 30 μm, printing, About 200μ while repeating drying
This is for forming a partition 102 requiring a height of about m (see Japanese Patent Application Laid-Open No. Hei 2-213020).

In the additive method, a photosensitive resin is applied on the back plate 101, grooves are formed in the photosensitive resin by light,
The partition walls 102 are formed by embedding glass powder in the grooves. In addition, the sand blast method uses the back plate 1
A glass layer having a predetermined thickness is formed on the entire surface of the substrate 01, a resist mask in the shape of the partition 102 is formed on the surface thereof, and the glass layer other than the partition 102 is removed by sandblasting. (JP-A-4-259728)
Reference).

Further, in the photosensitive paste method, a paste in which a photosensitive resin is mixed is applied on a back plate 101, and after masking, light is irradiated to directly form the partition 102.

[0007]

However, in the above-described printing and laminating method, printing and drying steps must be repeated many times in order to form the partition walls 102 having a predetermined height. In addition, the yield must be extremely low because printing must be performed with high accuracy for each lamination. Further, the partition 102 is easily deformed due to positional deviation during printing, and the dimensional accuracy of a display cell formed by the partition 102 is 100
The maximum difference between the measured values when measuring 45 rows of dimensions for 0 cells was about 0.35 mm, which did not satisfy the demand for higher definition.

Further, even in the additive method, the partition wall 102 is formed using light, and the partition wall 1 is not necessarily required to have sufficient accuracy.
02 could not be formed. Furthermore, in the sandblasting method, since the sandblasting is performed after using the photoresist for forming the mask, the process is complicated,
Moreover, it is difficult to form the partition 102 with high precision. Further, when the abrasive used for the blasting process is collected and used repeatedly, there is a decrease in the grinding force due to abrasion deterioration of the abrasive and a change with time, and it has been difficult to stably mass-produce. On the other hand, when using without collecting the abrasive,
The cost of the abrasive was high, and mass production was again difficult in this case.

Further, the partition walls 102 are formed thereon by using light even in the photosensitive paste method, and the partition walls 102 cannot always be formed with sufficient accuracy. In the plasma display device substrate 105, it is strongly required that the partition walls 102 be arranged accurately and accurately between the electrodes 104 on the back plate 101. However, any of the above-described manufacturing methods has a high precision and a fine pitch. It has been difficult to manufacture a large-sized plasma display device substrate 105 in a simple process at low cost.

[0010] Further, the phosphor is applied to the inner wall surface 106 of the partition 102. Even when the phosphor is applied to the inner wall surface 106, the phosphor is dripped from the inner wall surface 106 and the phosphor is sufficiently applied to the inner wall surface 106. It could not be applied. Furthermore, the corners at the ends of both ends of the partition 102 are easily chipped when they come into contact with the front plate 108 or the like, and the prevention of breakage of the ends at both ends is expected.

[0011]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention provides a ceramic powder or ceramic powder on a back plate made of ceramic or glass so that the phosphor can be sufficiently held on the inner wall surface of the partition. A partition was formed from a mixture of glass powder and a binder, and a substrate for a plasma display device was obtained in which a vertical holding groove for a phosphor was formed on the inner wall surface of the partition.

Further, in order to prevent breakage of the ends of both ends of the partition, the partition is formed by a mixture of ceramic powder or glass powder and a binder on the back plate made of ceramics or glass, and the ends of both ends of the partition are circular. An arc-shaped substrate for a plasma display device was obtained.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. First, a plasma display device will be described. As shown in FIG. 1, a substrate 1 for a plasma display device includes a plurality of partitions 3 made of ceramics or glass on one surface of a back plate 2 made of ceramics or glass, and cells 4 are formed between the partitions 3. .

An electrode 5 is provided on the bottom surface of the cell 4. After a phosphor is applied to the inner wall surface 6 of the cell 4, the partition wall 3 is provided by a front plate 108 provided with an electrode 107 as shown in FIG. A plasma display device can be configured by covering the upper end of the cell and filling gas into the cell 4. Then, by discharging between the electrodes 5 and 107, the inner wall surface 6 of the cell 4 is discharged.
The phosphor applied to the substrate can emit light. Actually, the electrodes 5 and 107 are arranged so as to be orthogonal. Although not shown, a three-electrode system in which the electrode 107 is composed of a pair of electrodes may be used. In this case, a sustain discharge occurs between the pair of electrodes 107, and the
To control the surface discharge type.

Next, a method for manufacturing the substrate 1 will be described.
First, FIG. 2 shows an overall outline. The electrodes 5 are formed on one surface of the back plate 2 made of ceramics or glass shown in FIG. 3 by screen printing at predetermined intervals. As shown in FIG.
A paste 11 of a mixture of ceramics or glass powder and a binder is applied on the back plate 2 having the electrodes 5.

Next, as shown in FIG.
A roll 13 having a circumferential groove 12 of a predetermined width and depth at a predetermined interval corresponding to the above is brought into contact with the paste 11 and rotated while being pressed, thereby forming the partition wall 3 on the back plate 2. The pressing force of the roll 13 is, for example, about 7 kg per 1 cm of the contact length of the roll 13 with the paste 11 in the axial direction, and is 700 kg at a contact length of 100 cm.

After that, if the partition walls 3 are cured by baking or the like, the substrate 1 of the present invention can be obtained. Here, the ceramic powder of the paste 11 forming the partition walls 3 includes:
Alumina (Al ₂ O1 _3), zirconia and oxide ceramics (ZrO ₂₎ or the like, silicon nitride (Si ₃ N _4), aluminum nitride (AlN), non-oxide ceramics such as silicon carbide (SiC), Alternatively, apatite (Ca ₅
(PO ₄ ) ₃ (F, Cl, OH)) and the like, and desired amounts of various sintering aids can be added to these ceramic powders.

Examples of the sintering aid include silica (SiO ₂ ), calcia (CaO), yttria (Y ₂ O ₃ ) and magnesia (MgO) for alumina powder, and yttria (Y ₂ O) for zirconia powder. ₃ ) and cerium (C
e), dysprosium (Dy), ytterbium (Y
b) or the like, an oxide of a rare earth element such as b), yttria (Y ₂ O ₃ ) and alumina (Al ₂ O ₃ ) for silicon nitride powder, and an oxide of a group 3a element of the periodic table in aluminum nitride powder ( RE ₂ O ₃ ) and the like, and boron (B), carbon (C) and the like can be added to silicon carbide powder in desired amounts.

The glass powder forming the partition walls 3 includes:
Various glasses containing silicate as a main component and containing at least one of lead (Pb), sulfur (S), selenium (Se), and alum can be used. Further, if the partition walls 3 are formed of glass and ceramics are added as a filler, strength and
Optical characteristics can be improved. For example, white ceramics such as alumina, zirconia, titania, and zinc oxide are used for the purpose of improving light reflectivity and panel brightness, and nickel oxide is used for the purpose of improving light-shielding properties and improving panel contrast. , A dark-colored ceramic such as copper oxide or chromium oxide is appropriately added according to the purpose.

The particle size of these ceramics or glass powders is preferably from several tens of microns to sub-microns, and specifically, about 0.2 to 10 μm, preferably about 0.2 to 5 μm. Is good. Further, examples of the organic additives to be added to these ceramic or glass powders include polyvinyl alcohol, polyvinyl butyral, acrylic resin, styrene resin, urethane resin and the like.

The solvent added to the mixture paste 11 is not particularly limited as long as it is compatible with the organic additive. For example, aromatic solvents such as toluene, xylene, benzene, and phthalic acid ester can be used. Aromatic solvents, higher alcohols such as hexanol, octanol, decanol, and oxyalcohol, and esters such as acetate and glyceride can be used.

In particular, the above-mentioned phthalic acid esters, oxyalcohols and the like can be preferably used, and two or more of the above-mentioned solvents can be used in combination in order to volatilize the solvent slowly. In addition, the content of the solvent is 0.1 parts by weight or more based on 100 parts by weight of ceramic or glass powder in order to maintain the shape retention of the molded body from the viewpoint of moldability. 35 parts by weight or less is more desirable because it is desirable to lower the viscosity of the mixture of the ceramic or glass powder and the organic additive, and 1 to 15 parts by weight in consideration of shrinkage during drying and firing. Is most desirable.

The material of the roll 13 is not particularly limited. For example, metal, resin, rubber, or the like can be used.
If necessary, a surface treatment such as a surface coating may be performed to improve the releasability and prevent abrasion. The back plate 2 is an unfired green sheet or a sintered body, and the material is not particularly limited. For example, various ceramic green sheets, various glass substrates, porcelain substrates, and the like have similar thermal expansion coefficients to the material of the partition walls 3. It is desirable to have. In addition, as the glass substrate, for example, relatively inexpensive glass such as soda lime glass and a material in which an inorganic filler is dispersed to improve its strain point can be used.

In the mixture paste 11, a surfactant such as polyethylene glycol ether, alkyl sulfonate, polycarboxylate, or alkylammonium salt is added to improve the dispersibility of the ceramic or glass powder. The content thereof is desirably 0.05 to 5 parts by weight based on 100 parts by weight of the ceramic or glass powder from the viewpoint of improving dispersibility and thermal decomposability.

Further, a curing catalyst called a curing reaction accelerator or a polymerization initiator can be added to the binder in the paste 11 of the mixture. As the curing catalyst, an organic peroxide or an azo compound can be used,
For example, ketone peroxide, diacyl peroxide, peroxyketal, peroxyester, hydroperoxide, peroxycarbonate, t-butylperoxy-2-ethylhexanoate, bis (4-
Organic peroxides such as (t-butylcyclohexyl) peroxydicarbonate and dicumyl peroxide; and azo compounds such as azobisisobutyronitrile.

In the plasma display device substrate 1 of the present invention, when the phosphor is applied to the inner wall surface 6 of the partition wall 3,
As shown in FIG. 6, a vertical holding groove 21 for the phosphor is formed on the inner wall surface 6 so that the phosphor is sufficiently held without dripping. When a lateral holding groove is formed in the inner wall surface 6, the partition wall 3 is formed.
In view of the strength, the partition wall 3 is preferably provided with a vertical holding groove 21 from the viewpoint of strength. The depth of the holding groove 21 is a surface roughness Rmax3 to 10 when the inner wall surface 6 is measured by a surface roughness meter.
It is preferably about μm. This is because the size of the holding groove 21 is at least 3 μm because the particle size of the phosphor is 3 μm, and if it is larger than 10 μm, the strength of the partition wall 3 is adversely affected. Also, the formation of the holding groove 21 in the partition 3 is as follows.
When the partition wall 3 is formed by the roll 13 at the same time when the partition wall 3 is released from the circumferential groove 12 of the roll 13 in the vertical direction, a special process is not required and the partition wall 3 can be formed at low cost. it can.

Further, in order to prevent breakage of the ends of both ends of the partition wall 3, as shown in FIG. If the ends of both ends of the partition wall 3 are formed in the shape of an arc 23, chipping does not occur even when the partition wall 3 contacts the front plate 108 or the like. Note that the entire length of the partition wall 3 is, for example, about 70 cm, and an arc shape 23 is formed at both ends in a range of 3 μm or less in the length direction. The arc 23 is formed by the roll 13
When the partition wall 3 is formed by the above method, the partition wall 3 having a sufficient height cannot be formed at the beginning and end of the molding, resulting in an arc shape 23. That is, by forming the partition walls 3 using the rolls 13, it is possible to form the end portions of both ends of the partition walls 3 in an arc shape 23 without any special process, and to form them at low cost.

Further, the cross-sectional shape of the circumferential groove 12 of the roll 13 can be set to a shape that matches the required partition wall 3. For example, as shown in FIG. 8, if the bottom surface of the circumferential groove 12 of the roll 13 is formed as a concave curved surface, the tip of the partition wall 3 can be formed as a convex curved surface as shown in FIG. "Example" Example 1 As a roll 13, 900 circumferential grooves having a groove width of 50 m and a groove depth of 200 m were formed at a pitch of 220 m on a metal roll having a diameter of 50 mm and a length of 200 mm. On the other hand, a soda lime glass plate of 200 × 250 mm was prepared as the back plate 2.

As a paste 11, low melting point lead glass powder to which alumina and titania are added is kneaded with a binder.
It was pasted and applied on a glass plate by a doctor blade technique. The roll was pressed at a pressure of 7 kg / cm from above the coating film, and the roll was rotated and the glass plate was fed to form a partition. The obtained molded body was fired at 550 to 600 ° C.

By the above operation, the width is 40 μm and the height is 15
A substrate for a plasma display device having 0 μm partition walls was obtained. Also, on the inner wall surface of this partition wall, a vertical groove having a Rmax of 3 to 10 μm is formed when releasing from the roll,
This can be used as the holding groove 21 for the phosphor. Further, since the partition walls are formed by rolls, both ends of the partition walls do not have a sufficient height, and are formed in an arc-like shape within a range of 3 μm or less in the length direction.
Could be formed.

[0031]

As described above, according to the present invention, a partition wall is formed on a back plate made of ceramic or glass with a mixture of ceramic powder or glass powder and a binder, and a vertical wall is formed on the inner wall surface of the partition wall. Since it is a substrate for a plasma display device in which a holding groove for a phosphor is engraved, the phosphor can be held in the holding groove on the inner wall surface of the partition wall and sufficiently applied to the inner wall surface.

Further, the present invention provides a plasma formed by forming a partition on a back plate made of ceramic or glass with a mixture of ceramic powder or glass powder and a binder, and forming the ends of both ends of the partition in an arc shape. Since the substrate is a display device substrate, breakage of the partition wall can be easily prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a substrate for a plasma display device according to the present invention.

FIG. 2 is a perspective view schematically showing a manufacturing method according to the present invention.

FIG. 3 is a longitudinal sectional view showing a state in which electrodes are attached by printing to one surface of a back plate according to the present invention.

FIG. 4 is a longitudinal sectional view showing a state in which a paste of a mixture is attached to a back plate.

FIG. 5 is a longitudinal sectional view showing a state in which a partition is formed on a back plate by a roll.

FIG. 6 is a perspective view showing a state in which a holding groove of a phosphor is formed on the inner wall surface of the partition wall according to the present invention.

FIG. 7 is a side view of a state in which a circular arc is formed at both ends of the partition wall of the present invention.

FIG. 8 is a sectional view of a roll according to the present invention.

FIG. 9 is a perspective view of a partition formed by the roll of FIG.

FIG. 10 is a longitudinal sectional view showing an outline of a conventional plasma display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Back plate 3 ... Partition wall 4 ... Cell 5 ... Electrode 6 ... Inner wall surface 11 ... Paste of a mixture 12 ... Circumferential groove 13 ... Roll 21 ... Holding groove 22 ... Outer peripheral surface 23 ... Arc shape

Continuing from the front page (72) Inventor Kenichi Yoneyama 1-4 Yamashita-cho, Kokubu-shi, Kagoshima Prefecture Within Kyocera Research Institute.

Claims (2)

[Claims] 1. A partition made of a mixture of a ceramic powder or a glass powder and a binder is formed on a back plate made of ceramics or glass, and a vertical phosphor holding groove is formed on an inner wall surface of the partition. For a plasma display device. 2. A substrate for a plasma display device, wherein a partition wall is formed on a back plate made of ceramic or glass with a mixture of ceramic powder or glass powder and a binder, and both ends of the partition wall are formed in an arc shape. .