KR100363680B1 - Fabricating Method of Plasma Display Panel - Google Patents

Abstract

The present invention relates to a method of manufacturing a plasma display panel which can seal the exhaust portion efficiently.

In the method of manufacturing a plasma display panel of the present invention, a method of manufacturing a plasma display panel in which an upper plate and a lower plate are bonded to each other and seals an exhaust hole formed on the lower plate is provided. And inserting the glass frit into the exhaust hole through the exhaust pipe, melting the glass frit using a laser or a lamp to shield the exhaust hole, and removing the O-ring and the exhaust pipe installed on the exhaust hole.

Accordingly, the manufacturing method of the plasma display panel according to the present invention does not use the exhaust pipe made of glass, so it is not necessary to consider cracks that may occur in the process of sealing the glass exhaust pipe. In addition, productivity can be increased and production costs can be reduced. In addition, since the exhaust part is not sealed by the torch method, it is not affected by the impurity gas. It also enables ease of automation, and is reproducible and reliable. In addition, the PDP manufactured according to the present invention has an advantage in that it is easy to handle since there is no sealed glass exhaust pipe, and the space occupied in the system when the system is configured using the PDP is small.

Description

Fabrication Method of Plasma Display Panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a plasma display panel, and more particularly to a method of manufacturing a plasma display panel capable of efficiently sealing an exhaust part.

Plasma Display Panel (hereinafter referred to as "PDP") emits phosphors by 147 nm ultraviolet rays generated upon discharge of He + Xe or Ne + Xe gas, thereby displaying an image including characters or graphics. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. These PDPs are largely classified into a DC drive method and an AC drive method. Unlike the DC driving method, the PDP of the AC driving method is attracting more attention as a display device because of the advantages of low voltage driving and long life by using a dielectric. PDP is composed of a plurality of discharge cells arranged in a matrix form, one discharge cell constitutes a pixel of the screen.

1 is a perspective view showing a conventional three-electrode alternating surface discharge type PDP.

Referring to FIG. 1, the discharge cell of the three-electrode PDP includes a bus / hold electrode 6 formed on the upper substrate 4 and an address electrode 18 formed on the lower substrate 16. The upper dielectric layer 10 and the passivation layer 12 are stacked on the upper substrate 4 on which the bus / hold electrode 6 is formed. The passivation layer 12 prevents damage to the upper dielectric layer 10 due to ions generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 12, magnesium oxide (MgO) is usually used. The lower dielectric layer 20 and the barrier rib 22 are formed on the lower substrate 16 on which the address electrode 18 is formed, and the phosphor layers 24R, 24G, and 24B are coated on the lower dielectric layer 20 and the barrier rib surface. The address electrode 18 is formed in the direction crossing the bus / sustain electrode 6. The partition wall 22 is formed in parallel with the address electrode 18 to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layers 24R, 24G, and 24B are excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. When the upper and lower plates 26 and 28 are formed as described above, the upper and lower plates 26 and 28 are bonded to each other at right angles by the seal member 30 as shown in FIG. 2. The exhaust hole 36 formed on the lower plate 28 is sealed with the glass frit 34 using the exhaust pipe 32. This will be described in detail with reference to FIGS. 3A to 3C.

First, as shown in FIG. 3A, the upper plate 26 and the lower plate 28 are attached with a seal material 30 having a plastic form. The exhaust pipe 38 is placed on the lower plate 28 so that the exhaust hole 36 formed on the lower plate 28 is located inside the exhaust pipe 38 made of glass, and the glass frit 34 is made of low melting glass. After the exhaust pipe 38 and the lower plate 28 are fixed, they are cooled by heat treatment at 400 to 500 ° C. When the exhaust pipe 38 and the lower plate 28 are bonded to each other, the stainless pipe 42 connected to the pump and the gas line 40 is connected to the exhaust pipe 38 as shown in FIG. 3B. Then, the pump 44 and the gas line 40 are used to remove the air 44 existing between the upper plate 26 and the lower plate 28 and inject the discharge gas 46. When the discharge gas 46 is injected between the upper plate 26 and the lower plate 28, the exhaust pipe 32 is melted and sealed by a torch as shown in FIG. 3C, thereby completing the production of the PDP.

However, when the PDP is manufactured in this manner, cracks are generated when the glass tube of the general material is used to melt and seal the middle of the glass exhaust pipe with a torch. Therefore, the production cost increases because the use of a special exhaust pipe. In addition, automation is difficult because the exhaust pipe is sealed by the torch method. Therefore, the production yield may vary depending on the person working. In addition, the exhaust pipe protrudes about 10 cm from the PDP, and because the material of the exhaust pipe is glass, it is easily broken. Therefore, it is difficult to handle and the productivity is greatly reduced. In addition, when the system is made using the PDP protruding from the exhaust pipe, the PDP takes up a lot of space. Therefore, there is a disadvantage that causes a lot of inconvenience in manufacturing the system.

Accordingly, an object of the present invention is to provide a method of manufacturing a plasma display panel which can efficiently seal the exhaust part.

1 is a perspective view showing a conventional three-electrode alternating surface discharge plasma display panel.

2 is a perspective view showing an overall appearance of a plasma display panel.

3A to 3C are cross-sectional views showing in stages sealing an exhaust hole of a conventional plasma display panel.

4A to 4E are cross-sectional views showing in stages sealing the exhaust hole of the plasma display panel according to the first embodiment of the present invention.

Fig. 5 is a plan view showing an O-ring installed on an exhaust hole formed on a lower plate.

6A through 6E are cross-sectional views showing sealing of the exhaust holes of the plasma display panel according to the second embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating sealing an exhaust hole of a plasma display panel according to a third embodiment of the present invention; FIG.

8 is a plan view of the coolant pipe shown in FIG. 7.

Fig. 9 is a sectional view showing sealing an exhaust hole of a plasma display panel according to a fourth embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

4: upper substrate 6: bus / holding electrode

10: upper dielectric layer 12: protective film

16: lower substrate 18: address electrode

20: lower dielectric layer 22: partition wall

24R, 24G, 24B: Phosphor 26: Top plate

28: lower plate 30: seal material

32,38,48,64,68: Exhaust Pipe 48A: Branch part of the Exhaust Pipe

48B: Contact point of exhaust pipe and O-ring 34,52,56,62: Glass frit

36 exhaust hole 40 pump and gas line

42: stainless steel pipe 44: air

46: discharge gas 50: cap

54: O-ring 58: laser or lamp

60: laser beam or lamp light 66: coolant pipe

66A: Inlet of the coolant pipe 66B: Outlet of the coolant pipe

70: round cross

In order to achieve the above object, the manufacturing method of the plasma display panel of the present invention is a method of manufacturing a plasma display panel in which an upper plate and a lower plate are joined and seal an exhaust hole formed on the lower plate, wherein an O-ring is provided on the exhaust hole. And installing an exhaust pipe over the O-ring, inserting a glass frit into the exhaust hole through the exhaust pipe, melting the glass frit using a laser or a lamp to shield the exhaust hole, and exhausting the exhaust pipe. Removing the o-ring and exhaust pipe installed above the hole.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4A to 9.

4A through 4E are cross-sectional views illustrating a method of manufacturing a PDP according to a first embodiment of the present invention.

Referring to FIG. 4A, the upper plate 26 includes a bus / hold electrode formed on the upper substrate, and the lower plate 28 includes an address electrode formed on the lower substrate. An upper dielectric layer is stacked on the upper substrate on which the bus / sustain electrodes are formed side by side, and a material 30 is formed on the edge of the substrate. A protective film is stacked on the upper dielectric layer except for the portion where the material 30 is formed. Magnesium oxide (MgO) is usually used as a protective film. The lower dielectric layer and the partition wall are formed on the lower substrate on which the address electrode is formed, and the phosphor layer is coated on the lower dielectric layer and the partition wall surface. When the upper and lower plates 26 and 28 are formed as described above, they are bonded to each other at right angles. When the upper and lower plates 26 and 28 are bonded together, a round O-ring 54 made of rubber is disposed on the exhaust hole 36 formed on the lower plate 28 as shown in FIG. 5. The O-ring 54 is easier to remove than the glass frit used to connect the lower plate and the exhaust pipe in the conventional PDP manufacturing method. When the O-ring 54 is installed on the lower plate 28, as shown in FIG. 4B, an exhaust pipe 48 made of stainless steel connected to the pump and the gas line 40 is installed on the O-ring 54. At this time, the exhaust pipe portion 48B in contact with the O-ring 54 has a shape like a hemisphere on the surface of the O-ring 54. In addition, a branched tube 48A is formed at one side of the exhaust pipe 48 so as to be bent freely. And a cap 50 is attached to the end of the tree-shaped tube 48A so that the glass frit 52 can be inserted and removed. When such an exhaust pipe 48 is mounted on the exhaust hole 36 formed on the lower plate 28, the twig tube 48A is bent to insert the glass frit 52 through the end, and then closed with the cap 50. . When the cap 50 is closed, the air 44 existing between the upper plate 26 and the lower plate 28 is removed using a pump and a gas line 40, and a predetermined amount of gas 46 is injected. When the gas 46 is injected, the tree-shaped tube 48A is unfolded as shown in FIG. 4C to allow the glass frit 52 in the tube 48A to enter the exhaust hole 36 by gravity. When the glass frit 52 enters the exhaust hole 36, as shown in FIG. 4D, the beam 60 may be irradiated to the upper plate 26 where the glass frit 52 is located by using a device such as a laser or a lamp 58, or other heating means. After melting with viscous glass frit (56) to cool. The exhaust hole 36 formed on the lower plate 28 of the PDP is then sealed as shown in Fig. 4E. Since the gap between the upper plate 26 and the lower plate 28 is very narrow (150 μm to 250 μm) in the process of sealing the exhaust hole 36, the exhaust hole 36 can be sealed even with a small amount of glass frit 52. Do. In addition, since the glass frit 56 melted by the laser or lamp 58 slightly enters the gap between the upper plate 26 and the lower plate 28 by capillary action, the exhaust hole 36 is more effectively sealed.

6A through 6E are cross-sectional views illustrating a method of manufacturing a PDP according to a second embodiment of the present invention.

Referring to FIG. 6A, the upper plate 26 includes a bus / holding electrode formed on the upper substrate, and the lower plate 28 includes an address electrode formed on the lower substrate. An upper dielectric layer is stacked on the upper substrate on which the bus / sustain electrodes are formed side by side, and a material 30 is formed on the edge of the substrate. A protective film is stacked on the upper dielectric layer except for the portion where the material 30 is formed. Magnesium oxide (MgO) is usually used as a protective film. The lower dielectric layer and the partition wall are formed on the lower substrate on which the address electrode is formed, and the phosphor layer is coated on the lower dielectric layer and the partition wall surface. When the upper and lower plates 26 and 28 are formed as described above, they are bonded to each other at right angles. When the upper and lower plates 26 and 28 are bonded, a chestnut-shaped glass frit 62 is inserted into the exhaust hole 36 formed on the lower plate 28 as shown in FIG. 6B. As shown in FIG. 6C, the O-ring 54 is disposed on the exhaust hole 36, and a cylindrical exhaust pipe 64 made of stainless steel connected to the pump and the gas line 40 is installed on the O-ring 54. The portion of the exhaust pipe that is in contact with the o-ring 54 is shaped like a hemisphere on the surface of the o-ring 54. When the exhaust pipe 64 is installed on the O-ring 54, the air 44 existing between the upper plate 26 and the lower plate 28 is removed using a pump and a gas line 40, and a predetermined amount of discharge gas 46 is removed. Inject. At this time, the glass frit 62 lying in the exhaust hole 36 is somewhat weighted and is not sucked into the pumping system by the force of gravity. In addition, since the groove is formed on the surface of the glass frit 62, a large gap is formed in the exhaust hole 36 so that the discharge gas 46 can be easily injected. When the discharge gas 46 is injected between the upper and lower plates 26 and 28, the beam 60 may be moved to the upper plate 26 where the glass frit 62 is positioned as shown in FIG. 6D by using a laser or a lamp 58. Irradiate or melt with viscous glass frit 56 through other heating means and cool. The exhaust hole 36 formed on the lower plate 28 of the PDP is then sealed as shown in Fig. 6E.

However, when sealing the exhaust hole formed on the lower plate of the PDP in this way, there is a problem that the O-ring may be deformed due to the heat generated when the glass frit melts. Therefore, as a third embodiment to compensate for this, as shown in FIG. 7, the coolant pipe 66 is installed on the exhaust pipe 64 portion which is in contact with the O-ring 54. As shown in FIG. 8, when the coolant flows through the inlet 66A of the coolant pipe 66, the coolant flows along the coolant pipe 66 shaped like an O-ring, and receives the temperature of the O-ring 54. Lower and exit through the outlet 66B of the coolant pipe 66. In this way, deformation of the O-ring can be prevented.

In the process of sealing the exhaust portion of the PDP, the glass frit is sucked into the pumping system when the pumping force performed in the pump and discharge gas injection process is greater than the gravity force acting on the glass frit. Therefore, as a fourth embodiment to compensate for this, as shown in FIG. 9, a glass frit is introduced into the pumping system by making a jaw at the bottom of the exhaust pipe 68 and attaching a cross-shaped round mesh 70 to the jaw portion. It can be prevented from being sucked in.

As such, the manufacturing method of the PDP according to the present invention does not use an exhaust pipe that is made of glass, so it is not necessary to consider cracks that may occur during the sealing process of the glass exhaust pipe. In addition, productivity can be increased and production costs can be reduced. In addition, since the exhaust part is not sealed by the torch method, it is not affected by the impurity gas. It also enables ease of automation, and is reproducible and reliable. In addition, the PDP manufactured according to the present invention has an advantage in that it is easy to handle since there is no sealed glass exhaust pipe, and the space occupied in the system when the system is configured using the PDP is small.

As described above, since the method of manufacturing the plasma display panel according to the present invention does not use the exhaust pipe made of glass, it is not necessary to consider cracks that may occur in the process of sealing the glass exhaust pipe. In addition, productivity can be increased and production costs can be reduced. In addition, since the exhaust part is not sealed by the torch method, it is not affected by the impurity gas. It also enables ease of automation, and is reproducible and reliable. In addition, the PDP manufactured according to the present invention has an advantage in that it is easy to handle since there is no sealed glass exhaust pipe, and the space occupied in the system when the system is configured using the PDP is small.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (7)

In the manufacturing method of the plasma display panel in which the upper plate and the lower plate is bonded to seal the exhaust hole formed on the lower plate, Installing an o-ring over the exhaust hole; Installing an exhaust pipe on the o-ring; Inserting a glass frit into the exhaust hole through the exhaust pipe; Melting the glass frit using a laser or a lamp to shield the exhaust hole; And removing the o-ring and the exhaust pipe installed on the exhaust hole. The method of claim 1, The O-ring provided on the lower plate has a round shape of a rubber material, characterized in that the manufacturing method of the plasma display panel. The method of claim 1, The exhaust pipe installed on the O-ring has a branch shape having a bendable portion, a straight cylindrical shape, and a jaw shaped like a moon in the form of a cross-section of the O-ring at the bottom of the exhaust pipe. Method for manufacturing a display panel. The method of claim 1, The glass frit is a plasma display panel manufacturing method, characterized in that formed in the shape of a chestnut or ball with a groove formed on the surface. The method of claim 1, And installing a coolant pipe on the exhaust pipe portion in contact with the o-ring to prevent deformation of the o-ring. The method of claim 3, wherein The method of manufacturing a plasma display panel, characterized in that a cross-shaped round net is installed on the bottom of the jaw of the exhaust pipe. delete