KR20000059971A - Connection method for front/rear panel of PDP - Google Patents

Abstract

PURPOSE: A method for coupling front and rear panels of a plasma display panel is provided to improve a quality of the plasma display panel by increasing performing activation to a dielectric passivation layer before attaching front and real panels. CONSTITUTION: In a method for coupling front and rear panels of a plasma display panel, a front panel and a rear panel are supplied into first and second chambers(ch1,ch2) through different loaders, respectively. A dielectric passivation layer of the front panel is activated under the condition of the first chamber(ch1) that a temperature of 350°C and a pressure of 10-6 torr. A previous vacuum of the rear panel is carried out in the second chamber(ch2). In a third chamber(ch3) is supplied the front and rear panels, and a fourth chamber(ch4) is heated so as to be increased up to 450°C. The front and rear panels are attached by melting and hardening a melting sealing member at a state where a temperature is maintained at 450°C during 30 minutes in a fifth chamber(ch5). A ventilation is carried out up to 10-6 torr in a sixth chamber(ch6), and the sixth chamber(ch6) is cooled.

Description

Front / rear panel combination method of plasma display panel {Connection method for front / rear panel of PDP}

The present invention relates to a front / rear panel coupling method of a plasma display panel (hereinafter referred to as a PDP), and more particularly, a front / rear panel of a PDP capable of improving the efficiency of activation of a dielectric protective layer protecting a dielectric and an electrode. It relates to a coupling method.

First, the PDP will be described.

The PDP constitutes an information display unit of a display device, and discharges an inert gas such as neon (Ne), helium (He), xenon (Xe), etc. between two glass substrates facing each other, and vacuum ultraviolet rays generated during the discharge. It is a gas discharge display element for exciting this phosphor.

As shown in FIGS. 1 and 2, a general AC PDP has a front panel 10, which is a display surface of an image, and a rear panel disposed parallel to the front panel 10 with a predetermined distance therebetween. It consists of a panel 20.

In this case, the front panel 10 includes a plurality of display electrodes 12 arranged in a stripe shape on a surface glass substrate 11 and a surface opposite to the rear panel 20 of the surface glass substrate 11; A dielectric layer 13 stacked to cover the display electrode 12 to limit discharge current during discharge and to facilitate generation of wall charges, and a dielectric protection layer 14 to protect the dielectric layer 13. )

Meanwhile, the rear panel 20 is arranged in a stripe shape on the rear glass substrate 21 and on the rear glass substrate 21 so as to be orthogonal to the display electrode 12. A plurality of address electrodes 22 for dividing the screen into a plurality of cells in a matrix form, partition walls 23 arranged in a stripe shape on the rear glass substrate 21 to form a discharge space, and the partition walls ( It is made up of a fluorescent layer 24 which is printed and coated in the discharge space formed by 23) and is excited by ultraviolet rays during the discharge of each cell to emit visible light. At this time, the fluorescent layer 24 is divided into red (R), green (G), blue (B) is applied alternately.

After the front panel 10 and the rear panel 20 made as described above are fused and exhausted using a seal seal 30, an inert gas is injected into the discharge space at a predetermined pressure to seal the PDP. The device is completed.

Referring to FIG. 3, the manufacturing process of the PDP may include manufacturing the front panel 10 (S10); Manufacturing a rear panel 20 (S20); The front panel 10 and the rear panel 20 are coupled to each other using the seal 30 (S30).

First, the process of manufacturing the front panel 10 (S10), according to the supply of the surface glass substrate 11, the cleaning process (S11), the metal film deposition process (S12) for forming the display electrode 12, the photo Resist (PR) coating step (S13), exposure step using mask (S14), developing step (S15), etching and photoresist removal step (S16), dielectric coating step (S17), firing step (S18), rear The sealing body 30 coating process (S19) for bonding with the panel 20 is included.

Meanwhile, in the process of manufacturing the rear panel 20 (S20), the cleaning process S21, the stripe-shaped partition wall 23 forming process S22, and the address electrode 22 may be performed according to the supply of the rear glass substrate 21. Metal film deposition step (S23), photoresist (PR) coating step (S24) for forming, exposure step (S25) using a mask, developing step (S26), etching and photoresist removal step (S27), phosphor 24 ) The coating step (S28) and the firing step (S29) are included.

The process of completing the PDP by combining the front panel 10 and the rear panel 20 formed by the above process (S30) is a fusion process (S31) by positioning, activate the dielectric protective layer and exhaust the inside of the discharge space And an exhaust / gas injection step S32 for injecting an inert gas at a predetermined pressure, an aging step S33 for lowering the driving voltage of the PDP, and an inspection S34.

Since the quality of the PDP is determined by the process (S30) of combining the front panel 10 and the rear panel 20 as described above (S30), a precise process is required.

In the PDP, the dielectric layer 13 is formed to cover the display electrode 12 and configured as a discharge protection resistor, thereby preventing overvoltage being applied to the discharge space and causing abnormal discharge to damage the electrode and the discharge space.

Referring to the discharge operation in the PDP, the primary electrons present in the discharge space are accelerated toward the anode when power is applied, and in this process, the discharge is started by ionizing the discharge gas due to collision with the discharge gas molecules. The cations generated after the discharge has been caused to attract the negative electrode and impact the dielectric protective film 14 to generate secondary electrons protruding from the dielectric protective film 14, and by the secondary electrons The process is repeated to enable continuous discharge.

Due to the above reason, the dielectric protective film 14 must have various conditions, and must emit a large number of secondary electrons by the impact of external cations, and the film quality should not be damaged by the impact of the cations.

As a material having the above conditions, magnesium oxide (MgO) is mainly used, and is formed as a dielectric protective film by an electron beam deposition method. However, since magnesium oxide (MgO) is a hydrophilic material, it is combined with moisture (H 2 O) in the atmosphere and exists in a state such as Mg (OH) 2 so that secondary electrons are released even by the impact of external cations. The disadvantage is that a higher voltage must be applied to maintain the discharge.

Therefore, the dielectric protective film made of magnesium oxide (MgO) may perform a function through an activation process after deposition. As the activation method, a method of maintaining about 2 hours in a high temperature and high vacuum environment is most widely used.

On the other hand, Figure 4 is a view showing the configuration of the chamber for coupling the front panel and the rear panel in the prior art, and the temperature and pressure change inside each chamber.

Referring to FIG. 4, a total of nine chambers configured as an inline type and separated as gates are provided, and after the exhaust port is drilled through the PDP without attaching an exhaust pipe to the PDP, the chamber itself is exhausted. Exhaust the inside of the PDP.

First, when the front panel and the rear panel are simultaneously supplied, the first and second chambers ch1 and ch2 are continuously heated to raise the temperature to 450 ° C. At this time, the inside of each chamber is maintained at a pressure of 760torr without vacuuming.

Thereafter, the molten sealing material is melted and fixed while the temperature is maintained at 450 ° C. for 30 minutes in the third chamber ch3 to bond the front panel and the rear panel.

Thereafter, cooling is performed in the fourth and fifth chambers ch4 and ch5 while lowering the temperature to 350 ° C. In the fifth chamber ch5, the temperature is lowered to 350 ° C and the vacuum pressure is reduced to 10 ^-6 torr inside the chamber. Lower to start the activation of the dielectric protective layer (MgO). That is, the cooling and activation process is performed at the same time.

Thereafter, in the sixth chamber ch6, the temperature is maintained at 350 ° C., and the pressure is maintained at 10 ⁻⁶ torr to continuously activate the dielectric protective layer MgO.

Thereafter, in the seventh chamber ch7, the temperature is maintained at 350 ° C., the pressure is exhausted to 10 ⁻⁶ torr, the cleaning gas is introduced, and the cleaning gas is exhausted again to remove impurities in the PDP. When the pressure inside the chamber reaches 10 ^-6 torr again, discharge gas is introduced into the chamber. At this time, the discharge gas is introduced at a high temperature of 350 ℃ so that the pressure of the introduced discharge gas is 500torr at atmospheric pressure. When the injection of the discharge gas is completed, the exhaust port formed in the PDP is blocked by using a sealing plug.

Thereafter, cooling is performed in the eighth and ninth chambers ch8 and ch9 to discharge and unload the PDP in which the manufacturing is completed.

In the prior art as described above, after the bonding of the front panel and the rear panel is performed, activation of the dielectric protective layer is performed. As shown in FIG. 2, the inside of the PDP includes the dielectric protective layer 14 and the partition wall ( 23), a material such as the fluorescent layer 24, the sealing body 30, etc. exist to emit the polluting gas at a high temperature, causing a problem that the yield and quality of the PDP are degraded.

In addition, since the space between the partition walls formed inside the PDP is formed in a very narrow passage, and the size of the exhaust port formed in the PDP is limited, the exhaust conductance is very low, making it difficult to completely exhaust the polluted gas therein. A problem arises in that it is difficult to exhaust the inside of the PDP to 10 ⁻⁶ torr.

As a result, it is difficult to implement a system because the inside of the chamber must be kept at a lower pressure in order to maintain the inside of the PDP at a desired condition, that is, at a pressure of 10 ^-6 torr during the exhaust and vacuum processes. It takes time to reduce productivity, and activation of the dielectric protective layer is not performed, which causes a problem of degrading the quality of the PDP.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to perform activation on the dielectric protective layer before bonding the front panel and the rear panel to increase the activation efficiency, thereby lowering the discharge sustain voltage and thus the quality of the PDP. It is to provide a front / rear panel coupling method of the plasma display panel that can be improved.

1 is an exploded perspective view showing the configuration of a general PDP;

2 is a cross-sectional view showing the configuration of a general PDP;

3 is a flowchart showing a manufacturing process of the PDP;

4 is a view showing a configuration of a chamber for coupling a front panel and a rear panel in the prior art, and a change in temperature and pressure inside each chamber;

5 is a view showing the configuration of the chamber for coupling the front panel and the rear panel in the present invention, and the temperature and pressure change inside each chamber.

<Description of the code | symbol about the principal part of drawing>

10 front panel 11 surface glass substrate

12 display electrode 13 dielectric layer

14 dielectric protective layer 20 rear panel

21 back glass substrate 22 address electrode

23: partition 24: fluorescent layer

30: frit seal

According to a feature of the present invention for achieving the above object, a first process of receiving a front panel and a rear panel into different chambers to activate the dielectric protective layer of the front panel, and performs a preliminary vacuum of the rear panel; A second process of receiving the front panel and the rear panel on which the first process is performed at the same time and determining the position to perform the temporary bonding while the dielectric protective layer is activated; A third process of heating after the second process is performed to perform bonding of the front panel and the rear panel; A fourth process of removing contaminant gas inside the PDP by performing cooling and exhausting after the third process is performed; And a fifth process of injecting discharge gas into the inside of the PDP and encapsulating after the fourth process is performed, and cooling the temperature to room temperature.

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

5 is a view showing the configuration of the chamber for coupling the front panel and the rear panel, and the temperature and pressure change in each chamber in the present invention.

Referring to FIG. 5, in the system to which the present invention is applied, the front panel and the rear panel are supplied to different first chambers ch1 and second chambers ch2 through different loaders. In this case, in the first chamber ch1, the dielectric protection layer MgO of the front panel is activated while maintaining the temperature at 350 ° C. and maintaining the pressure at 10 ⁻⁶ torr. In addition, a preliminary vacuum of the rear panel is performed in the second chamber ch2. In the process of activating the dielectric protective layer of the front panel, since the dielectric protective layer is exposed to the chamber, it is possible to apply a vacuum degree of 10 ⁻⁶ torr in a short time, thereby increasing the efficiency of activation. At this time, it may be activated by supplying light energy rather than heat.

After the process described above, the third chamber ch3 receives the front panel and the rear panel at the same time to determine the position during activation of the dielectric protective layer to perform temporary bonding.

Thereafter, the fourth chamber ch4 is continuously heated to raise the temperature to 450 ° C. In this case, the fourth chamber ch4 uses a vacuum chamber so as not to destroy the degree of vacuum of the third chamber ch3.

Subsequently, in the fifth chamber ch5, the molten sealant is melted and fixed while maintaining the temperature at 450 ° C. for 30 minutes to bond the front panel and the rear panel in the air.

Thereafter, the sixth chamber ch6 is cooled and exhausted to 10 ⁻⁶ torr. At this time, the contamination of the dielectric protective layer may be generated by the release of pollutant gas from the molten sealant used in the fifth chamber ch5 and the atmosphere, and the pollutant gas is cleaned by the exhaust process.

Subsequently, in the seventh chamber ch7, the discharge gas is introduced while the pressure inside the chamber maintains the pressure of 10 ⁻⁶ torr, and then the exhaust port formed in the PDP is blocked and sealed, and the eighth chamber ch8 is cooled to room temperature. To discharge the unloaded PDP.

As described above, the front / rear panel coupling method of the plasma display panel of the present invention can improve the PDP quality by increasing the activation efficiency by activating the dielectric protective layer before bonding the front panel and the rear panel. It works.

In addition, since the dielectric protective layer is exposed to the chamber in the process of activating the dielectric protective layer of the front panel, it is possible to apply a vacuum degree of 10 ^-6 torr in a short time, thereby reducing the processing time and improving productivity.

Claims (1)

A first process of receiving the front panel and the rear panel into different chambers to activate the dielectric protective layer of the front panel and performing preliminary vacuum of the rear panel; A second process of receiving the front panel and the rear panel on which the first process is performed at the same time and determining the position to perform the temporary bonding while the dielectric protective layer is activated; A third process of heating after the second process is performed to perform bonding of the front panel and the rear panel; A fourth process of removing contaminant gas inside the PDP by performing cooling and exhausting after the third process is performed; And And a fifth process of injecting discharge gas into the PDP and encapsulating the fourth process and cooling the same to room temperature after the fourth process is performed.