JPH09245655A - Partition wall unit, its molding method and plasma display panel using this partition wall unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten weight, improve shock resistance, attain high brightness as high accuracy high luminous area, reduce the cost and make manufacturing possible in an easy process, by forming a partition wall unit of organic polymer material. SOLUTION: A partition wall unit 11a having a partition wall 12a, arranged between front/rear plate of a plasma display panel, is formed of organic polymer material. Preferably, the partition wall unit 11a is constituted by the partition wall 12a and a plate-shaped unit 13a provided in a lower surface thereof, and the partition unit 11a is integrally formed with the rear plate formed of similar organic polymer material. In the partition wall 12a and a bottom part of a discharge picture element surrounded by this partition wall, preferably, fluorescent material layers 14R, 14G or 14B are made to adhere. In this adhering, before molding the partition wall unit 11a, forming is preferable by making the fluorescent material layer previously adhere to a male core surface of molding form. Further, the organic polymer material in use is selected by considering heat resistance, coefficient of expansion, mechanical strength, insulation, or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition body, a method for forming the partition body, and a plasma display panel using the partition body.

[0002]

2. Description of the Related Art In recent years, the spread of flat panel displays including liquid crystal display devices has been remarkable.
In particular, the plasma display panel is positioned as an important display that influences the widespread adoption of high-definition broadcasting, and is characterized by its advantage in large-sized screens compared to liquid crystal display devices, and it is aimed at product development in the market. There is.

Plasma display panels are roughly classified into DC type and AC type, and there is a difference in structure as shown in FIGS. 7 and 8 due to the difference in their driving methods.
FIG. 7 is a sectional view showing an example of a conventional DC type plasma display panel, and FIG. 8 is a sectional view showing an example of a conventional AC type plasma display panel.

In FIGS. 7 and 8, the reference numeral 1 denotes a discharge pixel space for plasma emission, and a portion filled with gas at the same time. 2 is an electrode, 3 is a dielectric, 4 is a front substrate,
5 is a partition wall, 6 is a phosphor layer, 7 is a rear substrate, 8 is a resistor,
9 is an insulator and 10 is a protective film.

In the above plasma display panel, a glass plate having electrodes 2 formed by vacuum deposition or sputtering is used as a front substrate 4 and a rear substrate 7, and a partition wall is provided between the front substrate 4 and the rear substrate 7. 5 is formed. The partition walls 5 are provided to form a partition between fine adjacent discharge pixels and to secure a discharge space gap in the thickness direction.

In the above-mentioned plasma display, the partition walls are made of a slurry of an inorganic material such as glass, are applied linearly by screen printing and dried, and then the coating and drying are repeated at the same position to obtain a desired height. It is then formed by firing. When the number of repetitions is large, the number of repetitions is 10 or more, which complicates the manufacturing process, has a low yield, and is extremely disadvantageous in terms of cost.

Further, in the manufacturing process of the partition wall, it is necessary to take a shape in which the width is wide at first and becomes narrower as it is piled up due to the restriction of the processing accuracy at the time of overcoating. As a result, the volume of the cell surrounded by the partition wall and the substrate becomes small, which causes a problem in quality such that the luminous efficiency is low and high definition cannot be achieved. The sandblast method and the additive method are known as methods for solving this problem.

The sandblast method is disclosed in Japanese Patent Laid-Open No. 5-18.
It is described in Japanese Patent No. 2592 and Japanese Patent Laid-Open No. 7-282729. In the sandblast method described in the above publication, after the barrier ribs that have been overlaid are fired, an abrasive is collided through a mask to scrape off excess portions.

Further, the above-mentioned additive method is disclosed in
No. 112035. In the additive method described in the above publication, a partition wall is formed by injecting a slurry for forming partition walls into a female mold made of photoresist, and drying, removing the photoresist, firing, and the like.

[0010]

However, in the conventional partition wall forming methods including the sandblast method and the additive method described in the above publications, in addition to the problem that it is difficult to achieve high definition, the process complexity and low yield result. There is a cost problem. Further, regardless of the type of plasma display panel, since all the substrates including the partition walls are made of an inorganic material such as glass, there is a problem that they are heavy and weak against impact.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a light-weight and excellent impact resistance, a high definition, and a high light emitting area for high brightness. And a plasma display panel using the partition body, and a method for manufacturing the partition body. .

[0012]

The present invention has been made to achieve the above object, and the partition wall body of the present invention is disposed between the front substrate and the rear substrate of the plasma display panel. A partition body having a partition wall for defining discharge pixels and securing a discharge space gap, which is formed of an organic polymer material.

As a result, the weight of the partition wall can be reduced, and at the same time, the impact resistance can be improved. Also, unlike conventional barrier ribs, the barrier ribs are not formed by overcoating, so that high brightness can be obtained by providing high definition and a high light emitting area, and at the same time, a simple process such as injection molding or stamping. It can be made inexpensively by molding.

It is more preferable that the partition of the present invention comprises a plate and a partition provided on the upper surface of the plate. Since the partition wall is supported by the plate-shaped body, warpage and deformation are less likely to occur, and accuracy is improved, and at the same time, a discharge pixel space with a bottom surrounded by the partition wall and the plate-shaped body is formed, and the inner wall of this discharge pixel space is formed. This is because it becomes easy to provide the phosphor layer.

In the partition wall of the present invention, it is preferable that the rear substrate is formed of an organic polymer material similarly to the partition body, and the partition body is integrated with the rear substrate. In this case, weight reduction and impact resistance can be further improved.

The plasma display panel using the partition of the present invention is lightweight and has excellent impact resistance.

It is preferable that the barrier rib of the present invention has a barrier rib and a phosphor layer attached to the bottom of the discharge pixel surrounded by the barrier rib.

According to the method of molding a partition body of the present invention to which the above-mentioned phosphor layer is attached, the core surface of the male mold of the male mold having the core and the female mold having the cavity is preliminarily fluorescent. A body layer was adhered and formed, and the male mold and the female mold were matched with each other, and an organic polymer material was filled in the void formed between the male mold core and the female mold to form a partition body. rear,
The mold is opened between the female mold and the male mold, and the phosphor layer is attached to the molded partition body, and the partition body and the phosphor layer are integrated and taken out.

According to the above-mentioned method of forming the partition wall of the present invention,
Since the phosphor layer attached to the periphery of the partition can be formed at the same time as the molding of the partition, it can be manufactured by a simpler process at a lower cost.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The organic polymer material forming the partition wall of the present invention is preferably one having a high heat resistance and a small expansion coefficient and a high dimensional stability, and a large mechanical strength. , Which has high insulation and high withstand voltage, low volatility, and easy moldability. Examples of organic polymer materials suitable for use in the present invention include so-called engineering plastics such as polycarbonate, polyarylate, polysulfone, polyethersulfone, and polyimide, and derivatives thereof.

In addition to the above, radical-polymerizable polymers such as acrylates, methacrylates and styrenes which are capable of thermal polymerization and photopolymerization, and their derivatives, and polyaddition properties of enethiols, epoxy resins, urethane resins, urea resins and the like. Examples thereof include polymers, and thermosetting or photocurable resins such as melamine resins and phenol resins and their derivatives. Furthermore, in order to improve the mechanical strength and dimensional stability of the organic polymer material and to reduce the coefficient of thermal expansion, a composite resin is mixed with an inorganic filler such as glass fiber, glass beads, titanium oxide, or alumina. Can also be used as

As a method of forming a partition wall from the organic polymer material, for example, stamping molding in which a sheet-shaped or film-shaped material of the organic polymer material is sandwiched between molds and hot-pressed, an organic polymer material is used. Injection molding to melt and inject into a closed mold, extrusion molding to melt the organic polymer material and extrude from the mold, solution casting in which the solution of the organic polymer material is poured into the mold to dry and solidify,
Various molding methods such as casting polymerization molding in which monomers etc. are injected into a mold and polymerized and solidified by heat or light, laser agitation in which a sheet or film-shaped organic polymer material is irradiated with a laser beam to form it Can be used. Further, the partition wall body is preferably subjected to sufficient heat treatment or curing in order to secure high dimensional stability and low volatility after molding.

The partition wall of the present invention is disposed between the front substrate and the rear substrate of the plasma display panel and has a partition wall for defining discharge pixels and ensuring a discharge space gap. For example, it is divided into a grid shape, a parallel shape, or a hexagonal shape. Further, a frame body may be provided around the partition body, and the partition wall may be bridged over the frame body. This makes it possible to prevent the partition wall from warping or deforming, which is convenient for holding the front substrate and the rear substrate in parallel at a constant interval. Further, the front surface side of each discharge pixel defined by being partitioned by the partition walls of the partition body is open, but the rear surface side may be bottomed or may be open.

The partition of the present invention is used by attaching a phosphor to the partition. This phosphor is Y ₂ 0 as a red phosphor.
₃ : Eu, Y ₂ SiO ₅ : Eu, Y ₃ Al ₅ O ₁₂ : E
u, YBO ₃ : Eu, (Y, Gd) BO ₃ : Eu, Zn
₃ (PO ₄ ) ₂ : Mn, GdBO ₃ : Eu, ScB
O ₃ : Eu, LuBO ₃ : Eu and the like.

As a green phosphor, Zn_TwoSiO_Four: M
n, BaAl₁₂O₁₉: Mn, CaAl ₁₂O₁₉: Mn, S
rAl₁₃O₁₉: Mn, YBO_Three: Tb, BaMgAl₁₄
O_{twenty three}: Mn, LuBO_Three: Tb, GdBO: Tb, Sc
BO_Three: Tb, Sr₆Si_ThreeO _ThreeCl_Four: Eu, etc.
You.

As a blue phosphor, Y ₂ SiO ₅ : Ce,
CaWO _4: Pb, there is BaMgAl ₁₄ O ₂₃ Eu and the like.
The phosphor is usually formed into a paste, dried and fired.

In order to form a phosphor on the partition of the present invention, in the case of a phosphor that does not require firing, injection,
It is possible by drying, solidification, etc., but when firing is required as described above, since the partition wall body is formed of an organic polymer material, it is preferable to mold by the partition wall body molding method of the present invention. .

That is, the molding method of the partition wall of the present invention is as follows.
Since the phosphor layer is formed by adhering to the core surface of the male die in advance, the adhering phosphor layer may be fired together with the male die.

The partition body according to the present invention is used by being disposed between the front substrate and the rear substrate of the plasma display panel. At this time, the partition body and the substrate may differ in the coefficient of thermal expansion of the material. In order to prevent the pixel shift or the like, the partition wall body may be fixed to the front substrate and the rear substrate by an adhesive agent or by heat fusion. As the above adhesive,
Examples of the adhesive include urethane resins, epoxy resins, acrylic resins, cyanoacrylates and other synthetic resins.

The front and rear substrates of the plasma display include a partition wall, electrodes, dielectrics, phosphors, resistors, etc., and are degassed / gas-filled in order to enclose gas such as He-Xe or Ne-Xe. Sealed except for the injection part. Generally, SiO ₂ —B ₂ O—PbO or B ₂ O—ZnO is used for this sealing.
Al ₂ O glass frit, such as -PbO, ZrO,
This is performed using a material to which TiO ₂ or the like has been added. At this time, since the partition wall body is formed of an organic polymer, only the seal portion is heated so that the partition wall body is not subjected to high heat.

As another method of sealing, a glass spacer close to the distance between the substrates is arranged between the front substrate and the rear substrate, and the spacer and both substrates are made of urethane resin, epoxy resin, acrylic resin (cyanoacrylate). And the like, or an inorganic adhesive such as an alkali metal silicate, a phosphate, or an alkyl silicate.

As described above, after the inside of the sealed front and rear substrates is temporarily evacuated so that the partition walls, electrodes, dielectrics, phosphors, resistors, etc. are enclosed, and then H
A plasma display panel can be obtained by enclosing a gas such as e-Xe or Ne-Xe.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, in which FIG. 1 is a partial perspective view of a partition wall for a DC type plasma display panel, and FIG. 2 is a partition wall of FIG. 1 to which a phosphor layer is attached. It is a perspective view. 3 is another embodiment of the present invention, which is a partial perspective view of a partition wall for an AC type plasma display panel, and FIG. 4 is a partial perspective view of the partition wall of FIG. 3 to which a phosphor layer is attached.

FIG. 5 is a perspective view of a plasma display panel using the partition wall body of FIG. 6A and 6B show a method of molding the partition wall body of FIG. 4, in which FIG. 6A is an explanatory view of a female mold showing a step of injecting the phosphor resin liquid, and FIG. 6B is a diagram of the injected phosphor resin liquid. Explanatory drawing showing a forming process, (c) is an explanatory view of a male mold in which a phosphor layer is adhered and formed, (d) is an explanatory view showing a molding step of a partition wall, (e) is a cross section of the molded partition wall It is a figure.

First, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, reference numeral 11 denotes a part of a partition wall body according to the present invention, and this partition wall body 11 is a DC
Type plasma display, which is made of polysulfone, which is an organic polymer material. Partition wall 11
Is a plate-shaped body 1 in which a large number of partition walls 12 formed in a lattice shape are formed.
A large number of discharge pixel spaces, which are integrally formed on the display panel 3 and are partitioned by the barrier ribs 12 to serve as display elements, are formed.

As shown in FIG. 2, the partition wall 11 has the following structure.
Phosphor layers 14R, 14G, and 14B are alternately attached to the upper surface of the partition 12 and the plate-shaped body 13 surrounded by the partition 12. 14R is a red phosphor layer made of (Y, Gd) BO ₃ : Eu, and 14G is Zn ₂ SiO ₄ : M.
n is a green phosphor layer, and 14B is BaMgA
A blue phosphor layer made of l ₁₄ O ₂₃ : Eu.

Next, another embodiment of the present invention will be described with reference to FIGS.
It will be described based on. In FIG. 3, 11 a shows a part of the partition wall body according to the present invention.
a is for an AC type plasma display and is made of polysulfone. The barrier rib body 11a is formed by integrally forming a large number of barrier ribs 12a, 12a arranged in parallel on the plate-shaped body 13a, and forming a large number of discharge pixel spaces which are display elements partitioned by the barrier ribs 12a, 12a. There is.

As shown in FIG. 4, in the partition 11a, phosphor layers 14R, 14G and 14B are alternately deposited on the upper surface of the partition 12a and the plate-like body 13a surrounded by the partition 12a. 14R is (Y, Gd) BO ₃ :
The red phosphor layer is made of Eu, and 14G is Zn ₂ S.
14B is a green phosphor layer made of iO ₄ : Mn.
It is a blue phosphor layer made of BaMgAl ₁₄ O ₂₃ : Eu.

Next, a plasma display panel P using the partition wall 11a will be described with reference to FIG. The partition wall 11a to which the phosphor layer is attached is used by being disposed between the front substrate 4 and the rear substrate 7 of the plasma display panel P. The front substrate 4 and the rear substrate 7 are
Both are made of transparent glass plates. Front substrate 4
The electrodes 2 and 2 are formed on the rear surface side and the front surface side of the rear substrate 7 so as to intersect with each other, and the periphery of the front substrate 4 and the rear substrate 7 on which the partition 11a is disposed is sealed with a sealing material 15. Has been done.

A gas such as He-Xe is enclosed in the discharge pixel space partitioned by the barrier ribs 12a of the barrier rib body 11a.
By applying a predetermined voltage to the electrodes 2 and 2 to form an electric field, discharge is performed in the discharge pixel space. The phosphor layers 14R, 14G, 14B and the like attached to the partition wall 11a are caused to emit light by the ultraviolet rays generated by this discharge, and the observer visually recognizes this light transmitted through the transparent front substrate 4. There is.

Next, the partition wall 11a to which the phosphor is attached
The molding method will be described with reference to FIG. The method of molding the partition wall 11a to which the phosphor of this embodiment is attached comprises a male mold 21 having a large number of cores 21a, 21a and a first female mold 23 having a large number of cavities 23a, 23a. The partition wall 11a is molded by the molding die 24, and a cavity 22a is formed which forms a gap smaller than the gap formed between the core 21a of the male die 21 and the cavity 23a of the first female die 23. The provided second female mold 22 is separately prepared.

First, as shown in FIG. 6 (a), the red phosphor slurry 30R, the green phosphor slurry 30G, and the red phosphor slurry 30R are provided in a large number of cavities 22a, 22a of the second female die 22, respectively.
The blue phosphor slurry 30B and the blue phosphor slurry 30B are alternately injected into desired portions. The above red phosphor slurry 30R,
Green phosphor slurry 30G and blue phosphor slurry 30
B is (Y, Gd) BO as a red phosphor, respectively.
₃ : Eu as a green phosphor, Zn ₂ SiO ₄ : Mn
Using BaMgAl ₁₄ O ₂₃ : Eu as a blue phosphor, and dispersing it so that polyvinyl butyral is 5 parts with respect to 100 parts of the phosphor, thereby forming a slurry.

Next, as shown in FIG. 6 (b), a male die 21 is fitted on the second female die 22 to form a die 20, and a core 21a of the male die 21 and a cavity 22a of the female die 22 are formed. The phosphor slurry 30 of the above three colors is provided in the gap formed between them.
Fill with R, 30G, and 30B, and heat dry to a temperature of 80 ° C.

After that, as shown in FIG.
Open the mold to make phosphor slurry 30R, 30G, 30B
The male die 21 to which is attached is baked at 550 ° C. for 30 minutes, and a phosphor layer 14G having a thickness of 25 μ is formed on the core 21a surface of the male die 21.
4R and 14B are adhered and formed.

Then, as shown in FIG. 6D, the male mold 21 and the first female mold 23 are matched with each other, and the phosphor layer 1 is formed.
Male 21 core 21 with 4G, 14R and 14B attached
a and the cavity 23a of the first female mold 23, polysulfone (trade name Udel P-170
No. 0, manufactured by Teijin Amoco Co., Ltd.) was injection-molded under the condition that the resin temperature was 370 ° C., sufficiently cooled, and then the male mold 21 and the first female mold 23 were opened to form a phosphor on the molded partition wall 11 a The layers 14G, 14R, 14B are attached to form the partition wall 11a.
And the phosphor layers 14G, 14R, 14B are taken out integrally. FIG. 6 (e) shows the demolded partition wall 11a.

[0046]

EFFECTS OF THE INVENTION Since the partition wall body according to the first aspect is formed of an organic polymer material, it is possible to impart the characteristics of being lightweight and excellent in impact resistance. Further, unlike conventional barrier ribs, the barrier ribs are not overcoated to form the barrier ribs. Therefore, high definition of the barrier rib body and high brightness of the plasma display panel can be achieved by the high light emitting area, and at the same time, for example, injection molding or Since it can be molded by a molding method suitable for mass production such as stamping molding, it can be manufactured at low cost.

In the partition body according to the second aspect, since the partition wall is formed on the plate-shaped body, warpage and deformation are less likely to occur, and accuracy is improved, and at the same time, the partition wall and the plate-shaped body are provided with a bottom. Discharge pixels are formed, and it becomes easy to provide a phosphor layer in the discharge pixels.

According to a third aspect of the present invention, in the partition body, the rear substrate is made of the same material as the organic polymer material of the partition body, and the partition body is integrated with the rear substrate. Impact resistance can be further improved.

The partition wall to which the phosphor layer according to claim 4 is attached, and the plasma display panel according to claim 5 using this partition wall are light in weight and excellent in impact resistance.
It is possible to realize a device having high brightness characteristics.

According to the method of molding the partition wall of the present invention, since the phosphor layer can be formed at the same time when the partition wall is molded, the phosphor layer can be manufactured by a simpler process at a lower cost.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a partition wall body for a DC type plasma display panel according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of the partition body of FIG. 1 to which a phosphor layer is attached.

FIG. 3 is a partial perspective view of a partition wall body for an AC type plasma display panel, which is another embodiment of the present invention.

FIG. 4 is a partial perspective view of the partition body of FIG. 3 to which a phosphor layer is attached.

FIG. 5 is a perspective view of a plasma display panel using the partition body of FIG.

6 shows a method of forming the partition wall body of FIG.
(A) is an explanatory view of a female mold showing a step of injecting a phosphor resin solution, (b) is an explanatory view showing a step of forming the injected phosphor resin solution, (c) is a phosphor layer attached Explanatory drawing of the formed male mold, (d) explanatory drawing which shows the molding process of a partition body,
(E) Drawing is a sectional view of a formed partition.

FIG. 7 is an explanatory diagram of a conventional DC type plasma display panel.

FIG. 8 is an explanatory diagram of a conventional AC type plasma display panel.

[Explanation of symbols]

 P plasma display panel 4 front substrate 7 rear substrate 11, 11a partition wall body 12, 12a partition wall 13, 13a plate-shaped body 14R, 14G, 14B phosphor layer 21 male 21a core 22, 23 first, second female 22a, 23a cavity

Claims (6)

[Claims] 1. A partition body provided between a front substrate and a rear substrate of a plasma display panel, the partition body having partition walls for determining discharge pixels and securing a discharge space gap, wherein the partition body is an organic polymer material. The partition body is characterized by being formed of. 2. The partition body according to claim 1, wherein the partition body comprises a plate-shaped body and a partition wall provided on an upper surface of the plate-shaped body. 3. The rear substrate is formed of an organic polymer material,
The partition body according to claim 1, wherein the partition body is formed integrally with the rear substrate. 4. The partition body according to claim 1, wherein the partition wall and a phosphor layer are attached to the bottom of the discharge pixel surrounded by the partition wall. 5. A plasma display panel using the partition wall body according to any one of claims 1 to 4. 6. A phosphor layer is preliminarily adhered and formed on the core surface of a male mold of a molding mold comprising a male mold having a core and a female mold having a cavity formed therein, and the male mold and the female mold. And mold the partition body by filling the voids formed between the male core and the female cavity with an organic polymer material, and then opening the female mold and the male mold to form 5. The method for forming a partition body according to claim 4, wherein a phosphor layer is attached to the partition body, and the partition body and the phosphor layer are integrally taken out.