KR20060031563A - Plasma display panel and making method thereof - Google Patents

Abstract

The present invention relates to a plasma display panel and a method of manufacturing the same.

In the plasma display panel of the present invention, the front glass substrate and the rear glass substrate arranged at regular intervals are bonded together, and the rear glass substrate is divided into a discharge region and a non-discharge region, and a powder type getter is formed in the non-discharge region. A getter injection tube including a getter injection hole formed to be inserted, an exhaust pipe including an exhaust hole formed to inject an inert gas after exhausting the gas inside the panel, and the exhaust gas so that the powder type getter does not flow out when the gas is exhausted inside the panel And a getter barrier formed around the hole.

In addition, the method of manufacturing a plasma display panel according to the present invention includes (a) a getter injection hole for injecting a getter, an exhaust hole for injecting exhaust and inert gas, and a rear glass substrate and a front surface including a getter barrier around the exhaust hole. Bonding a glass substrate to form a panel, (b) installing a getter injection tube and an exhaust pipe at a position of the getter injection hole and an exhaust hole, and (c) tipping off the getter injection tube after injecting the getter (d) exhausting impurity gas inside the panel through the exhaust pipe, and (e) tipping off after injecting discharge gas into the panel through the exhaust pipe.

Description

Plasma Display Panel and Making Method

1 is a perspective view schematically showing a structure of a conventional AC type PDP device.

2 is a diagram showing a fill type getter installed in a conventional PDP.

Figure 3 is a view for explaining the process of forming a fill (Pill Type) getter of the conventional PDP manufacturing process.

4 is a view showing a strip type getter installed in a conventional PDP.

5 is a view for explaining a process of forming a getter of the strip type (Strip Type) when manufacturing a conventional PDP.

6 is an exploded perspective view showing the structure of a PDP according to the present invention.

Figure 7 schematically shows the structure of the back glass substrate of the PDP according to the present invention.

8 is a view showing a PDP manufacturing process according to the present invention.

***** Explanation of symbols for the main parts of the drawing *****

100: front substrate 110, 120: sustain electrode

130a: upper dielectric layer 140: protective layer                 

200: rear substrate 201: exhaust hole

202: exhaust pipe 204: powder type getter

205: getter barrier 210: partition wall

220: address electrode 230: phosphor

301: injection hole 302: injection tube

The present invention relates to a plasma display panel and a method for manufacturing the same, and more particularly, to a plasma display panel having a powder getter and a method for manufacturing the impurity gas in the plasma display panel manufacturing process.

In general, a plasma display panel (hereinafter referred to as a PDP) is applied with an alternating current (DC) or a direct current (AC) voltage to an electrode, and a gas discharge occurs between the electrodes. At this time, the phosphor by ultraviolet radiation emits light. To display an image.

1 is a perspective view schematically showing a structure of a conventional AC type PDP device. As shown in the figure, the PDP is coupled in parallel with the front glass substrate 10 which is the display surface on which the image is displayed and the rear glass substrate 20 which forms the rear surface with a predetermined distance therebetween.                         

The front glass substrate 10 is made of a metal material and sustain electrodes 11 and 12 for maintaining light emission of cells by mutual discharge in one pixel below, that is, transparent electrodes 11a and 12a made of a transparent ITO material. The sustain electrodes 11 and 12 provided with the bus electrodes 11b and 12b are formed in pairs. The sustain electrodes 11 and 12 form wall charges and are covered by the upper dielectric layer 13a which holds the discharge by the discharge holding voltage, protects the electrode from ion shock during plasma discharge, and serves as a diffusion barrier film. On the upper dielectric layer 13a, a protective layer 14 on which magnesium oxide (MgO) is deposited is formed to facilitate discharge conditions.

In the rear glass substrate 20, a plurality of discharge spaces, that is, stripe-type barrier ribs 21 for forming a cell are arranged in parallel to each other, and an address discharge is performed at a portion crossing the sustain electrode 11. A plurality of address electrodes 22 that generate ultraviolet rays are arranged in parallel with the partition wall 21. In addition, a lower dielectric layer 13b is formed on an upper surface of the address electrode 22, and an upper surface of the lower dielectric layer 13 is formed by applying R, G, and B fluorescent layers 23 that emit visible light for image display during address discharge. do.

The conventional front glass substrate and the rear glass substrate having such a structure are sealed by frit glass to form a PDP, and in order to increase the discharge efficiency during plasma discharge inside the PDP, such as helium (He), neon (Ne), xenon (Xe), and the like. Inert gas is injected.

Meanwhile, referring to a process of injecting an inert gas into the PDP, first, an exhaust hole is formed in the front glass substrate or the rear glass substrate of the PDP to forcibly exhaust the impurity gas present therein, and the above-described state is maintained in a state of having a constant vacuum degree. Inert gas is injected. At this time, when an inert gas is injected while the impurity gas or air present in the PDP is not sufficiently exhausted, a large amount of impurity gas such as H ₂ O, H ₂ , O ₂ , CO, CO _2, etc. is present, and the PDP is driven. Discharge start voltage characteristics, drive voltage characteristics, and luminance characteristics are adversely affected.

Therefore, a non-diffusion getter is formed in the PDP in order to remove the impurity gas generated in these exhaust processes and other various processes. Non-diffusion getters are divided into fill type and strip type, depending on their shape.

In general, the fill type getter cannot be mounted inside the panel because of its large size, and thus, a getter room is formed outside the panel as shown in FIG. 2, and the getter is inserted into the getter room.

2 is a diagram illustrating a getter of a fill type installed in a conventional PDP. Referring to FIG. 2, the conventional PDP is provided with a glass getter room 15 for mounting the getter 16 in addition to the exhaust pipe 17 for evacuating the inside of the panel, and the getter 16 in the getter room 15. Is inserted to adsorb and remove the impurity gas generated in a predetermined process such as an exhaust process during the PDP manufacturing process.

These getters are inserted into a getter room formed in a predetermined number according to each size model of the PDP and mounted in the PDP. In general, about 4 getters are mounted in the 42 "inch model PDP.

3 is a view for explaining the process of forming a fill type (Pill Type) getter of the conventional PDP manufacturing process. Referring to FIG. 3, a getter forming process is performed. First, a bonding process is performed in which a front glass substrate and a rear glass substrate are sealed by frit glass. At this time, in order to inject a constant vacuum and inert gas into the inside of the PDP, an exhaust pipe is installed on one of the front and rear glass substrates, and a glass getter room such as an exhaust pipe is installed on the rear glass substrate.

Thereafter, after the getter is inserted into the getter room, heat is applied to the tip-off, and the exhaust process is performed by applying heat to maintain a predetermined degree of vacuum in the PDP using an exhaust pipe installed on the rear glass substrate. At this time, the getter formed in the getter room is activated by the heated heat during the exhaust process and adsorbs the impurity gas present therein.

Thereafter, after inert gas is injected into the PDP through the exhaust pipe, the exhaust pipe is tip-offd.

On the other hand, as described above, the fill type getter installed in the PDP can improve the PDP characteristics by removing the impurity gas present inside the panel, but the getter room installation process for forming the getter is required, thereby increasing the production yield. There is a problem to drop, thereby increasing the cost of the PDP manufacturing.

In addition, the getter room is a structure that protrudes on the back of the panel, and this structure also makes it difficult to install a mechanical part such as a heat sink on the back of the PDP, and should be designed in consideration of the getter room where the driving circuit board and the like protrude. There is a problem that is restricted.

Furthermore, the getter room is made of glass material, which has a high possibility of being damaged during the modularization work to install a heat sink and a driving circuit board after PDP fabrication.

4 illustrates a strip type getter installed in a conventional PDP. As shown, the conventional strip type getter 20a is installed inside the PDP in the form of a thin plate having a thickness smaller than the distance between the front glass substrate and the rear glass substrate, and the installation position is plasma when the PDP is driven. It is formed in the non-discharge area where discharge has not occurred so that the external shape of the PDP is not changed.

Therefore, the strip type getter has an advantage of not causing a change in the PDP shape that occurs when the getter of the fill type described above is mounted.

However, the getter of the strip type has a problem that the getter is activated and damaged during the PDP manufacturing process as shown in FIG. 5.

5 is a view for explaining a process of forming a getter of the strip type (Strip Type) when manufacturing a conventional PDP. Referring to FIG. 5, a strip type getter is formed on the inner surface of the PDP rear glass substrate before the bonding process for sealing the front glass substrate and the rear glass substrate during the PDP fabrication process. This strip type getter is activated during the process of bonding the front glass substrate and the rear glass substrate at a high temperature of 400 ° C. or higher to adsorb the impurity gas present therein, and the exhaust process and gas injection to be performed later There is a problem that can not remove the impurity gas generated during.

On the other hand, there is a powder type getter before forming into a fill type getter or a strip type getter as a non-diffusion getter in a PDP. This very good use was limited due to the high possibility of explosion, causing a violent reaction to a small external shock.

However, recently, the powder type getter has been developed to be used in display devices to control the exothermic and endothermic reactions to reduce the risk of explosion in the reaction and to maintain the getter performance of impurity gas adsorption.

These powder type getters can be inserted through the exhaust port after the PDP bonding process, eliminating the need for multiple getter rooms required for fill type getters and bonding like strip type getters. There is an advantage that the getter is not likely to be damaged during the process, and moreover, the surface area of the getter is larger than that of other fill type or strip type getters, which has the greatest efficiency in purifying impure gas.

However, when the powder type getter is injected through the exhaust port after the PDP bonding process, the powder getter is also released during the exhaust process of exhausting residual gases into the PDP. That is, due to the strong air flow inside the PDP as the internal air escapes when exhausting, there is a problem that the powder getter is also discharged outside the air flow.

Therefore, there is a problem that sufficient getter material is not formed in the PDP to remove impurity gas.

 Accordingly, the present invention relates to a plasma display panel and a method for manufacturing the same, which can efficiently remove impurity gas in a panel by preventing the powder getter from being discharged out of the panel during the PDP manufacturing process including the powder getter.

Plasma display panel of the present invention for achieving the above object is bonded to the front glass substrate and the rear glass substrate arranged at a predetermined interval, the rear glass substrate is divided into a discharge region and a non-discharge region, the non-discharge region A getter injection tube including a getter injection hole formed to insert a powder type getter into the exhaust pipe, an exhaust pipe including an exhaust hole formed to inject an inert gas after exhausting the gas inside the panel, and the powder type getter when the gas is exhausted inside the panel It includes a getter barrier formed around the exhaust hole so as not to leak.

In addition, the method of manufacturing a plasma display panel of the present invention includes (a) a getter injection hole for injecting a getter, an exhaust hole for injecting exhaust and inert gas, and a rear glass substrate including a getter barrier around the exhaust hole and the front surface. Bonding a glass substrate to form a panel, (b) installing a getter injection tube and an exhaust pipe at a position of the getter injection hole and an exhaust hole, (c) injecting a getter into the getter injection tube, (d) Exhausting the impurity gas inside the panel through the exhaust pipe, and (e) injecting a discharge gas into the panel through the exhaust pipe, and then tipping off.

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

6 is an exploded perspective view showing the structure of the PDP according to the present invention, Figure 7 is a schematic diagram showing the structure of the back glass substrate of the PDP according to the present invention. Referring to FIGS. 6 and 7, the PDP according to the present invention is coupled in parallel by the fleet glass A with a predetermined distance between the front glass substrate 100 and the rear glass substrate 200 on which an image is displayed. do.

That is, the front glass substrate 100 is made of a sustain electrode (110,120), that is, a transparent electrode (110a, 120a) formed of a transparent ITO material and a metal material for maintaining the light emission of the cell by mutual discharge in one pixel below The sustain electrodes 110 and 120 provided as the bus electrodes 110b and 120b are formed in pairs. The sustain electrodes 110 and 120 form a wall charge, are maintained by the discharge sustain voltage, and are covered by the upper dielectric layer 130a which protects the electrode from ion shock during plasma discharge and serves as a diffusion barrier film. On the top surface 130a, a protective layer 140 on which magnesium oxide (MgO) is deposited is formed to facilitate discharge conditions.

In the rear glass substrate 200, a plurality of discharge spaces, that is, partitions 210 for forming a cell, are arranged to be parallel to each other, and address discharge is performed at a portion crossing the sustain electrodes 110 and 120 to generate vacuum ultraviolet rays. A plurality of address electrodes 220 are arranged parallel to the partition wall 210. In addition, a lower dielectric layer (not shown) is formed on an upper surface of the address electrode 220, and an upper surface of the lower dielectric layer is formed by applying R, G, and B fluorescent layers 230 that emit visible light for image display during address discharge. do.                     

In addition, an exhaust hole 201 is formed outside the rear glass substrate, which is a non-discharge area, to inject exhaust and inert gas for maintaining the degree of vacuum in the PDP, and a powder type getter 204 for removing impurity gas is injected. The getter injection hole 301 is formed in the non-discharge region. In this manner, the exhaust pipe 202 and the getter injection tube 302 are fixed and attached to the rear surface of the rear glass substrate 200 where the exhaust hole 201 and the getter injection hole 301 are located by the frit glass 203.

On the other hand, the powder type getter 204 injected into the PDP is made of fine particles, there is a problem that outflow to the outside by a strong flow of air during the PDP exhaust process. That is, the powder type getter also flows to the outside through the exhaust hole of the rear glass substrate. In order to prevent this, in the present invention, the powder type getter 204 is not leaked to the outside during the PDP exhaust process. The ketter barrier 205 is formed around the exhaust hole 201.

The getter barrier 205 is composed of a plurality of unit getter barriers 205a, and the unit getter barriers 205a maintain a constant distance from the adjacent unit getter barriers 205a to draw a closed surface around the exhaust hole 201. Is formed.

 In addition, the interval between the unit getter barriers 205a is smaller than the particle size of the powder type getter so that the powder type getter 204 does not flow out through the exhaust hole during the PDP exhaust process.

The PDP of the present invention having such a structure is largely manufactured through a bonding process of the front glass substrate and the rear glass substrate, an exhaust process, and an inert gas injection process, which is discharge gas. Looking at this in detail as shown in FIG.

8 is a view showing a PDP manufacturing process according to the present invention.

First, although not shown in the drawings, a front glass substrate and a rear glass substrate forming a panel are manufactured separately as in the prior art. At this time, the rear glass substrate is manufactured by adding a getter barrier around the position where the exhaust hole is to be formed.

The getter barrier is manufactured at the same time when the barrier rib for partitioning the discharge cell is fabricated during the fabrication of the rear glass substrate, and the material of the getter barrier used is the same as that of the barrier rib. That is, the getter barrier is formed at the same time when the barrier rib is manufactured without an additional process for manufacturing the getter barrier.

Thereafter, as shown in FIG. 8A, an exhaust hole 201 for injecting exhaust gas and an inert gas into the plasma non-discharge region of the rear glass substrate 200 and a getter injection hole 301 for injecting the getter are formed. Form.

Subsequently, as illustrated in FIG. 8B, a frit glass (not shown) is applied to an outer portion of the rear glass substrate 200 on which the exhaust hole 201 is formed, and then heat treated at a predetermined temperature to produce a front glass substrate prepared in advance. 100) to form a panel. At this time, the exhaust pipe 202 and the getter injection tube 302 are fired and fixed at the positions of the exhaust hole 201 and the getter injection hole 301 formed on the rear glass substrate 200 by using a fleet glass (not shown). .

Thereafter, as shown in FIG. 8C, the powder type getter 204 is injected through the getter injection tube 302.

Thereafter, as shown in FIG. 8D, after tipping off the getter injection tube 302, as shown in FIG. 8E, impurity gas existing in the panel through the exhaust pipe 202 is removed. After the exhaust and discharge gas is injected, the PDP is completed through a process of tipping off the exhaust pipe 202.

As such, the PDP of the present invention including the powder getter does not require a getter room, which is required while using a conventional fill type getter, and uses a getter of strip type to obtain a getter during the panel bonding process. Can be prevented from being lost.

In addition, the PDP according to the present invention can exhibit sufficient performance as a getter because the impurity gas does not flow out of the impurity gas during the exhaust process during the manufacturing process.

As described above, it will be understood by those skilled in the art that the above-described technical configuration may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, the present invention can prevent the powder type getter outflow to the outside of the panel when the powder type getter is used to increase the efficiency for removing the impurity gas present in the PDP, thereby increasing the efficiency for removing the impurity gas. It can be effected.

Claims (7)

In the plasma display panel is bonded to the front glass substrate and the rear glass substrate arranged at a predetermined interval, The rear glass substrate is Divided into discharge area and non-discharge area, A getter injection tube including a getter injection hole formed to insert a powder type getter into the non-discharge region; An exhaust pipe comprising an exhaust hole formed for injecting an inert gas after exhausting the gas inside the panel; and Getter barriers formed around the exhaust hole so that the powder type getter does not flow out when the gas is exhausted inside the panel. Plasma display panel comprising a. The method of claim 1, The getter barrier is formed of a plurality of unit getter barriers arranged at a predetermined interval. The method of claim 2, The spacing of the plurality of unit getter barriers is smaller than the particle size of the powder type getter. The method according to claim 1 or 2, And the getter barrier forms a closed curved surface around the exhaust hole. The method of claim 1, The getter barrier is the same as the material of the barrier rib formed on the rear glass substrate. (a) bonding a getter injection hole for injecting a getter, an exhaust hole for injecting exhaust and inert gas, and a rear glass substrate including a getter barrier and a front glass substrate around the exhaust hole to form a panel; (b) installing a getter inlet pipe and an exhaust pipe at positions of the getter injection hole and the exhaust hole; (c) tip-off after injecting a getter into the getter injection tube; (d) exhausting the impurity gas inside the panel through the exhaust pipe; And (e) injecting a discharge gas into the panel through the exhaust pipe and then tipping off Plasma display panel manufacturing method comprising a. The method of claim 6, The getter is a plasma display panel manufacturing method, characterized in that the powder type.

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