KR20080090748A - Manufacturing method of plasma display panel - Google Patents

Manufacturing method of plasma display panel Download PDF

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Publication number
KR20080090748A
KR20080090748A KR1020070033968A KR20070033968A KR20080090748A KR 20080090748 A KR20080090748 A KR 20080090748A KR 1020070033968 A KR1020070033968 A KR 1020070033968A KR 20070033968 A KR20070033968 A KR 20070033968A KR 20080090748 A KR20080090748 A KR 20080090748A
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KR
South Korea
Prior art keywords
gas
protective film
panel
display panel
plasma display
Prior art date
Application number
KR1020070033968A
Other languages
Korean (ko)
Inventor
이병준
Original Assignee
엘지전자 주식회사
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Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020070033968A priority Critical patent/KR20080090748A/en
Publication of KR20080090748A publication Critical patent/KR20080090748A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/385—Exhausting vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/395—Filling vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/38—Control of maintenance of pressure in the vessel
    • H01J2209/387—Gas filling

Abstract

The present invention relates to a method for manufacturing a plasma display panel, wherein the plasma can improve the discharge characteristics by removing the afterimage generated by the gas or the gas remaining on the surface of the magnesium oxide protective film and preventing contamination of the discharge gas. An object of the present invention is to provide a method of manufacturing a display panel. To this end, the present invention comprises the steps of preparing a top plate and a bottom electrode formed with a bus electrode, a sustain electrode, a dielectric, a protective film and an address electrode, a dielectric, a partition wall, a fluorescent film, the upper plate and the bottom plate is bonded by a sealing means to form a panel In the step, the upper plate and the lower plate is bonded to each other by a sealing means to form a panel, exhausting the air inside the panel to remove air, injecting a protective film homogenizing gas into the inside of the panel to uniformly treat the surface of the protective film And exhausting remaining gas or gas in the panel, and injecting a discharge gas into the panel.

Description

Manufacturing Method of Plasma Display Panel {MANUFACTURING METHOD OF PLASMA DISPLAY PANEL}

1 is a perspective view showing a conventional plasma display panel.

2 is a view illustrating a temperature profile of an exhaust and gas injection process in the method of manufacturing a plasma display panel according to an exemplary embodiment of the present invention.

3 is a diagram illustrating a manufacturing process of a plasma display panel according to an exemplary embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10: top plate 20: bottom plate

20a: exhaust hole 30: real

40: exhaust pipe 40a: exhaust pipe

45: frit

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 in which a protective film having a high secondary electron coefficient is developed to reduce a driving voltage and improve brightness and efficiency.

1 is a view illustrating a structure of a plasma display panel according to a conventional method of manufacturing a plasma display panel, in which FIG. 1A is a perspective view showing an overall configuration of a plasma display panel, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A, and FIG. 1C. Is a detail view of the portion “B” of FIG. 1B.

Plasma Display Panel (PDP), as shown in Figure 1a, the upper plate 10 and the lower plate 20 made of a transparent glass substrate is bonded by a seal material 30, the space therebetween Is filled with a discharge gas.

The top plate 10 has a bus and sustain electrode 12 formed on a transparent glass substrate 11, as shown in Figure 1c, on top of the dielectric 13 and magnesium oxide for protecting the dielectric (13) A protective film 14 made of MgO) is formed in turn.

The lower plate 20 is formed of an address electrode 22 for transmitting a data signal on a transparent glass substrate 21, and then a dielectric 23 is formed thereon, and the partition wall 24 is formed at a predetermined interval on the dielectric 23. Is formed. In addition, a phosphor is coated and fired between the partitions 24 to form a phosphor film 25.

In particular, an exhaust hole 20a is formed in the lower plate 20 as shown in FIGS. 1A and 1B, and an exhaust pipe 40 attached to a frit 45 is installed in the exhaust hole 20a. do.

The upper plate 10 and the lower plate 20 are bonded to each other by applying and firing the real material 30 between the upper plate 10 and the lower plate 20 prepared as described above. Thereafter, the air between the upper plate 10 and the lower plate 20 is exhausted using a pump through the exhaust pipe 40, and then an appropriate amount of discharge gas such as Xe, Ne, Ar is injected therebetween, and then the exhaust pipe is discharged. The manufacturing of the plasma display panel is completed by melting and sealing the 40 with a torch.

Plasma display panel using the magnesium oxide protective film 14 of the prior art because the brightness and efficiency is very low compared to the cathode-ray tube (CRT) can not secure a suitable contrast (contrast) in the bright surroundings, As high power is required for driving, power consumption increases and the area occupied by the driving circuit increases.

Therefore, in order to improve image quality and lower power, development of a protective film having a high secondary electron emission coefficient γ that directly affects driving voltage is required.

In particular, the surface discharge type plasma display panel filled with a mixed gas of neon / xenon (Ne / Xe) has a smaller ionization energy and a larger size than xenon gas, and thus the size of the xenon ion is very small. As the number becomes very large relative to the number of neon ions, it becomes more dependent on the secondary electron emission coefficient of the xenon gas.

In order to solve the above problems, the Korean Patent Publication (Registration No .: 10-0396758) facilitates secondary electron emission by xenon gas through a protective film having a secondary electron emission coefficient, thereby lowering the driving voltage and improving brightness and efficiency. In order to be improved, hydrogen or deuterium gas is added to the mixed gas of neon / xenon and heat-treated in a strong reducing atmosphere to protect the magnesium oxide protective film 14. A method of manufacturing a plasma display panel in which oxygen vacancies are formed is proposed.

However, in the above-described method of manufacturing a plasma display panel, hydrogen or deuterium gas remains on the surface of the magnesium oxide protective film 14, and the remaining hydrogen or deuterium gas is left. As a result, the conditions under which magnesium oxide is adsorbed are changed, resulting in an afterimage occurring in the plasma display panel.

In addition, in the above-described plasma display manufacturing method, hydrogen or deuterium gas remains on the surface of the passivation layer 14 during the exhaust process, and then in the process of aging after completing the plasma display panel. The foreign matter is adsorbed on the surface of the protective film 14 is changed into a gas state and mixed with the discharge gas. As a result, there is a problem that the discharge characteristics of the plasma display panel are greatly degraded.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of manufacturing a plasma display panel that can remove an afterimage caused by a gas or a gas remaining on a surface of a magnesium oxide protective film.

In addition, an object of the present invention is to provide a method of manufacturing a plasma display panel that can prevent the discharge gas is contaminated to improve the discharge characteristics.

In order to achieve the above object, a method of manufacturing a plasma display panel according to an embodiment of the present invention includes preparing a top plate on which a bus electrode, a sustain electrode, a dielectric, and a protective film are formed, and a bottom plate on which an address electrode, a dielectric, a partition, and a fluorescent film are formed. Comprising: the step of combining the upper plate and the lower plate by a sealing means to form a panel, the step of combining the upper plate and the lower plate by a sealing means to form a panel, exhausting the air inside the panel to remove the air, And injecting a protective film homogenizing gas into the panel to uniformly treat the surface of the protective film, and injecting a discharge gas into the panel.

The process of injecting or exhausting gas or gas into the panel is performed through an exhaust pipe connected to the exhaust hole of the lower plate, and forms a plurality of exhaust holes in the lower plate, and installs exhaust pipes in the exhaust hole, respectively. Inject or exhaust gas or gas through the exhaust pipe.

Here, the protective film homogenizing gas is hydrogen or deuterium.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view illustrating a temperature profile of an exhaust and gas injection process in a method of manufacturing a plasma display panel according to an exemplary embodiment of the present invention, and shows a time and a detailed temperature distribution and pressure distribution according to a process progress.

First, the temperature raising step is a step of raising the temperature from room temperature to 450 ° C., and takes about 3 hours. At this time, maintaining the time of about 10 minutes at 400 ℃ is a part to relieve the thermal stress caused by the panel heat. In general, the temperature rise rate of soda lime, which is a material of the glass substrate, is defined as 50 ° C./min at a thickness of 6 mm, but it is unreasonable to apply it directly to the plasma display panel. This is because the plasma display panel uses various materials and undergoes a calcination process at a high temperature, and thus physical properties are significantly different from those of the basic raw materials. Therefore, it can be said that determining the temperature increase rate corresponds to the know-how of panel makers.

The sealing process is determined in consideration of the characteristics of the sealant used to bond the upper substrate and the lower substrate, and in the current process is about 30 minutes at 450 ℃ according to the curing temperature and time of the sealant. To reduce the time and temperature in this area, new sealants need to be developed.

The exhaust / protective film activation process activates the protective film for about 2 hours under conditions of 350 ° C. and 10 −6 Torr to maintain the maximum performance of the protective film coated on the surface substrate. When the protective film is exposed to the atmospheric layer, the protective film is contaminated due to the reaction between moisture in the atmosphere and carbon dioxide gas, so that the protective film suppresses the reaction with the atmosphere through activation.

The cooling process is a process of cooling the panel to room temperature at 350 ° C. after the protective film activation process is completed. Since the cooling process takes about 9.5 hours, it corresponds to the neck process of the process. This process is the most thermally stressed process, so the temperature-fall rate is most important, because if the temperature rate is not correct, the panel is cracked and burned. Therefore, the most ideal temperature-fall rate is to naturally cool, because the neck is formed too large for the productivity of the product, it is a future problem to increase the temperature-fall rate without the occurrence of cracks.

The discharge gas injection process injects about 500 Torr of discharge gas (Ne, Xe) into the panel after the panel is cooled to room temperature and seals the exhaust pipe. Since the sealing process of the exhaust pipe is usually performed manually by using a burner, it becomes another cause of productivity decrease. The manufacturing of the plasma display panel is completed by the above process.

In the method of manufacturing a plasma display panel according to the present invention, a protective film homogeneous gas is injected at a time point when the exhaust / protective film activation process ends and the cooling process starts to make the protective film made of magnesium oxide (MgO) uniform. When the extra protective film homogenizing gas is reached through the process of evacuating the remaining gas or gas inside the panel when it reaches the normal temperature time point (20 to 30 ° C), the adsorption condition due to the discharge difference does not change and the plasma display panel is discharged. No smudge occurs when driving.

In the present invention, hydrogen or deuterium gas is used as the protective film homogenizing gas, but deuterium gas called D2 gas is mainly used.

The emission of secondary electrons by xenon gas from the discharge gas of the plasma display panel is greatly influenced by the defect state, density and position of oxygen pores formed on the surface of the protective film made of magnesium oxide. As the probability of neutralizing ions increases, the possibility of secondary electrons is increased.

Therefore, the oxygen pores in the donor defect state formed in the protective film made of magnesium oxide facilitate the emission of secondary electrons by the xenon gas, which particularly affects the discharge characteristics of the neon / xenon mixed gas of the plasma display panel.

In order to form the oxygen pores as described above, the upper plate on which the transparent electrode, the top plate dielectric, and the magnesium oxide protective film are sequentially formed on the substrate in order to form the oxygen pores in the protective film made of magnesium oxide is strongly reduced including hydrogen or deuterium. Heat treatment in the atmosphere, by adjusting the heat treatment temperature and the concentration of hydrogen or deuterium, it is possible to increase the density of the oxygen vacancy.

At this time, since the hydrogen or deuterium is easily diffused even at a low temperature, heat treatment may be performed at a temperature range of about 20 to 400 ° C., preferably, a protective film by heat treatment at a temperature range of about 200 to 300 ° C. Oxygen pores of uniform density can be formed inside the thickness direction.

In order to increase the aforementioned secondary electron emission coefficient, conventionally, the hydrogen gas or deuterium gas is injected through an exhaust port in a discharge gas injection process together with a mixed gas such as neon / xenon (Ne / Xe), and the exhaust port is tip-off ( Tip off), however, at this time, stains generated by the residual gas remaining on the surface of the protective film made of magnesium oxide, that is, afterimage, become a problem, which makes it difficult to be practical.

However, in the method of manufacturing the plasma display panel according to the present invention, since the residual gas that is uniformly bonded to the surface of the magnesium oxide material and the remaining gas is effectively removed, the secondary electron emission coefficient is increased to lower the discharge voltage by 5 to 6 V. In addition, the afterimage can be removed efficiently.

Hereinafter, a method of manufacturing a plasma display panel according to the present invention will be described in detail with reference to a process diagram.

3 is a view illustrating a manufacturing process of a plasma display panel according to an exemplary embodiment of the present invention, FIG. 3A is a top and bottom plate bonding and exhaust pipe bonding process diagram, FIG. 3B is an exhaust process diagram, and FIG. 3C is a protective film uniformity gas injection process diagram. 3D is a residual gas exhaust process diagram, FIG. 3E is a discharge gas injection process diagram, and FIG. 3F is an exhaust pipe sealing process diagram.

A method of manufacturing a plasma display panel according to an embodiment of the present invention is as follows.

First, the upper plate 10 and the lower plate 20 should be manufactured, respectively. The upper plate 10 sequentially forms a bus, a sustain electrode, a dielectric, and a protective film 14 on the glass substrate, and the lower plate 20 is formed on the glass substrate. An address electrode, a dielectric, a partition, and a fluorescent film are sequentially formed. Since the address electrode, the dielectric, the partition, and the fluorescent film are the same as in the prior art, description thereof will be omitted.

Next, as shown in FIG. 3a, the upper plate 10 and the lower plate 20 are bonded to each other by applying and firing the real material 30 between the upper plate 10 and the lower plate 20.

Then, the exhaust pipe 20 made of glass is placed on the exhaust hole 20a formed in the lower plate 20, the frit 45 made of low melting glass is fixed thereon, and then heat treated at 400 to 500 ° C. Cool.

When the real material 30 is completely baked in this manner, the sealing process between the upper plate 10 and the lower plate 20 is finished, and the exhaust pipe 40 is fixed to the lower plate 20 by the frit 45.

Next, as shown in FIG. 3b, a pipe 43 connected to a pump and a gas line is connected to the exhaust pipe 40, and the pump 43 is first pumped to remove air existing between the upper plate 10 and the lower plate 20. do.

Next, as shown in FIG. 3C, heat is applied to the exhaust pipe 40 while applying hydrogen (H) or deuterium (H 3 ) gas, which is a protective film homogenizing gas, between the upper plate 10 and the lower plate 20 to apply heat. Heat treatment at 600 ℃ for a certain time.

In this case, when hydrogen (H) or deuterium (H 3 ) gas is injected between the upper plate 10 and the lower plate 20 as described above, the protective film 14 made of magnesium oxide (MgO) of the upper plate 10 is reduced. Thus, an artificial defect state is formed on the surface of the protective film 14. Therefore, secondary electrons are also emitted by gas ions having small ionization energy.

Next, as shown in FIG. 3D, pumping is performed through the exhaust pipe 40 to completely remove the remaining gas between the upper plate 10 and the lower plate 20, and then, as shown in FIG. 3E, Xe, Ne, An appropriate amount of discharge gas such as Ar is injected between the upper plate 10 and the lower plate 20 through the exhaust pipe 40.

When the discharge gas is filled between the upper plate 10 and the lower plate 20 as described above, as shown in FIG. 3f, the intermediate portion of the exhaust pipe 40a is melted and sealed using a torch to complete the manufacture of the PDP.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the present invention is not limited to the above embodiment, various modifications and combinations are possible, and various embodiments of the technical idea are all present invention Naturally, it belongs to the protection scope of.

The method of manufacturing the plasma display panel according to the present invention as described above can remove the afterimage generated by the gas or the gas remaining on the surface of the magnesium oxide protective film and at the same time reduce the driving voltage to improve the brightness and efficiency. There is an effect that this excellent plasma display panel can be provided.

In addition, the manufacturing method of the plasma display panel according to the present invention has the effect that it is possible to provide a plasma display panel that can prevent the discharge gas is contaminated to improve the discharge characteristics.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (5)

Preparing an upper plate on which a bus electrode, a sustain electrode, a dielectric, and a protective film are formed, and a lower plate on which an address electrode, a dielectric, a partition, and a fluorescent film are formed; Bonding the upper plate and the lower plate by sealing means to form a panel; Evacuating the air inside the panel to remove the air; Injecting a protective film homogenizing gas into the panel to uniformly treat the surface of the protective film; Evacuating the remaining gas or gas inside the panel; And Injecting a discharge gas into the panel; and manufacturing a plasma display panel. The method of claim 1, And injecting or exhausting gas or gas into the panel through an exhaust pipe connected to an exhaust hole of the lower plate. The method of claim 2, And a plurality of exhaust holes are formed in the lower plate, and exhaust pipes are provided in the exhaust holes to inject or exhaust gas or gas through the plurality of exhaust pipes. The method according to any one of claims 1 to 3, The protective film homogenizing gas is hydrogen (hydrogen) manufacturing method of a plasma display panel. The method according to any one of claims 1 to 3, The protective film homogenizing gas is deuterium (Deuterium) manufacturing method of the plasma display panel.
KR1020070033968A 2007-04-06 2007-04-06 Manufacturing method of plasma display panel KR20080090748A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100987194B1 (en) * 2010-01-27 2010-10-12 정필문 Patterned light guide plate and manufacturing method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100987194B1 (en) * 2010-01-27 2010-10-12 정필문 Patterned light guide plate and manufacturing method thereof

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