KR20000004390A - Forming method of plasma display panel - Google Patents

Abstract

PURPOSE: A forming method of plasma display panel is provided to easily connect between substrates by forming second sealing layer on a first sealing layer deposited seal paste. CONSTITUTION: The method comprises the steps of: forming address electronode on back face of substrate, deposing all of first dielectric layer so as to cover the address electronode, forming bulkheads limiting space of discharge on the first dielectric layer and forming a first sealing layer on the first dielectric layer; deposing fluorescent between the bulkheads, forming second sealing layer in the first sealing, forming discharge maintaining electronode on the substrate, deposing the second dielectric layer so as to cover the discharge maintaining electronode, connecting the back face of substrate to front face of substrate and sealing discharge gas in the space of discharge.

Description

Manufacturing Method of Plasma Display Panel

The present invention relates to a method for manufacturing a plasma display panel, and more particularly, to a method for preventing the spread of a seal paste, which is an adhesive for bonding the back substrate and the front substrate.

Plasma Display Panel (PDP), which is one of the flat panel display devices, is composed of an array of discharge cells capable of independently discharging, and discharges each discharge cell independently according to an electrical signal applied from the outside. To reproduce the image.

Since the overall thickness of the PDP can be less than 1 cm, the thickness and weight of the PDP can be remarkably reduced compared to the CRT display device using an electron gun, and a wide viewing angle can be obtained compared to the liquid crystal display device. There is this.

In addition, the PDP has a structure in which a pair of glass substrates are bonded to each other through a barrier rib defining a discharge cell. In this case, a large display device can be easily manufactured by forming a wide gap between the barrier ribs. Have.

1 is a view showing a conventional AC-type PDP, as shown, AC-type PDP is a structure in which the back substrate and the front substrate manufactured through an independent process, respectively.

Here, the address electrode 2 and the first dielectric layer 3 covering the address electrode 2 are formed on the rear substrate 1, and the independent discharge space is defined on the first dielectric layer 3 and the space between adjacent discharge spaces is defined. The partitions 4 are formed to prevent crosstalk, and the phosphor layer 5 is formed between the partitions 4.

Discharge sustaining electrodes 7 are formed on the front substrate 6, and a second dielectric layer 8 is entirely coated on the front substrate 6 so that the discharge sustaining electrodes 7 are covered. On the dielectric layer 8, a protective layer 9 made of a material such as MgO is formed.

In addition, a discharge gas 10 such as argon (Ar), neon (Ne), or xenon (Xe) is enclosed in the discharge cell defined by the partition walls 4.

On the other hand, the back substrate 1 and the front substrate 6 are bonded together by a seal paste 12 printed on the edge of the back substrate 1, in this case, the back surface where the seal paste is printed. After the substrate 1 is brought into contact with the front substrate 6, the outer substrate 1 is pressed with a clip to achieve bonding between the rear substrate 1 and the front substrate 6.

However, in the bonding method as described above, a phenomenon in which the seal paste spreads to the inside and the outside of the panel is generated by the pressure applied from the clip. At this time, when the seal paste spreads to the inside, contamination of the inside of the panel is caused. When spread out, the bonding between the substrates is not properly made, there is a problem of covering the electrode.

Therefore, the present invention devised to solve the above problems, in the state in which the first sealing layer that can prevent the spread of the seal paste is formed in advance in the edge portion of the back substrate to which the seal paste is applied, the first SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a PDP that can facilitate bonding between substrates by forming a second sealing layer coated with a seal paste in one sealing layer.

1 is a cross-sectional view showing a conventional AC plasma display panel.

2 is a cross-sectional view illustrating a method of manufacturing a plasma display panel according to an embodiment of the present invention.

3 illustrates a screen mask according to an embodiment of the present invention.

4 is a cross-sectional view illustrating a method of forming a partition and a first sealing layer according to an exemplary embodiment of the present invention.

5 is a view for explaining a coating method of the second sealing layer according to an embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

21 back substrate 22 address electrode

23 dielectric layer 24 partition wall

24a: partition paste 25 phosphor

26: front substrate 27: discharge holding electrode

28: second dielectric layer 29: protective layer

30: first sealing layer 32: second sealing layer

41: first mask pattern 41a, 41b: first opening

42: second mask pattern 42a, 42b: second opening

Method of manufacturing a PDP of the present invention for achieving the above object comprises the steps of: forming address electrodes on the rear substrate; Applying a first dielectric layer to cover the address electrodes; Forming barrier ribs defining independent discharge spaces on the first dielectric layer portion corresponding to the display region, and forming a recessed first sealing layer on the first dielectric layer portion corresponding to the non-display region; Applying a phosphor between the barrier ribs; Forming a second sealing layer in the groove-shaped first sealing layer; Forming discharge sustaining electrodes on the front substrate; Applying a second dielectric layer to the entire surface of the discharge sustaining electrodes; Applying a protective layer on the second dielectric layer: bonding the rear substrate and the front substrate to face the electrode arrangement surface by using a second sealing layer formed on the rear substrate; And encapsulating a discharge gas in a discharge space defined by the partition walls.

According to the present invention, after forming the groove-shaped pattern on the edge portion of the back substrate to which the seal paste is to be applied, the seal paste is injected into the pattern, thereby preventing the spread of the seal paste during bonding between the substrates.

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

FIG. 2 is a cross-sectional view illustrating a PDP according to an embodiment of the present invention. As illustrated, the address electrodes 22 are formed by a known method, and the first dielectric layer 23 is coated on its entire surface to cover them. The barrier ribs 24 defining a discharge space are formed on the first dielectric layer 23, and the rear substrate 21 coated with the phosphor 25 and the discharge sustain electrodes are disposed between the barrier ribs 24. 27 is formed, and the second sealing layer 32 having the front substrate 26 on which the second dielectric layer 28 and the protective layer 29 are stacked is formed at the edge of the rear substrate 21. Is adhered by. In addition, the discharge gas 30 is enclosed in the discharge cell defined by the partition wall 24.

Here, as shown, the second sealing layer 32 is formed in the first sealing layer 31 of the groove shape. The groove-shaped first sealing layer 31 is formed together with the partition wall 24 at the time of manufacturing the back substrate 21. In the embodiment of the present invention, the partition wall 24 and the groove-shaped first sealing layer 31 are formed. In order to simultaneously form the screen mask 50, as shown in FIG.

FIG. 3 illustrates a portion of a screen mask for simultaneously forming a partition and a first sealing layer. As illustrated, the screen mask 50 may include a first mask for forming a partition on an inner portion of the display area. The pattern 41 is provided, and the second mask pattern 42 for forming the groove-shaped first sealing layer is provided at the edge portion disposed in the non-display area. In this case, the first pattern 41 is disposed at a wide interval between the first openings 41a and 41b on which the partition paste is printed, similarly to the gap between the discharge cells, and the second pattern 42 has a groove shape. Two second openings 42a and 42b are disposed adjacent to each other so that a pattern of?

When the barrier rib and the first sealing layer are simultaneously formed using the screen mask as described above, as shown in FIG. 4, the rear substrate on which the address electrode 22 and the first dielectric layer 23 covering the same is coated ( 21, the partition mask paste is repeatedly printed in a state where the screen mask 50 is disposed on the barrier layer 50 to form a partition wall and a first sealing layer pattern having a predetermined height, and then the partition walls 24 and the groove shape are formed through a firing process. The first sealing layer 31 of is formed at the same time.

In this case, the first sealing layer 31 is formed of the same material as the partition wall 24, and in particular, the height of the first sealing layer 31 is equal to or higher than the height of the partition wall 24. It is formed so that the partition wall formed on the back substrate can be brought into contact with the front substrate at the time of bonding between the substrates.

Subsequently, as shown in FIG. 5, the phosphor 25 is applied between the partitions 24 to realize colorization, and the second sealing layer 32 is disposed in the groove-shaped first sealing layer 30. Forming, but the method is using a printing method, or injected into a dispenser to complete the manufacture of the back substrate.

In an embodiment of the present invention, in the state where the first sealing layer having a 凹 shape is formed at the edge portion of the back substrate to which the seal paste is to be applied, the second sealing layer coated with the seal paste is formed in the first sealing layer. Therefore, when the back substrate and the front substrate manufactured through the independent process, the seal paste is prevented from spreading to the inside or the outside of the panel formed by bonding the substrates.

At this time, even if the seal paste spreads to the inside and the outside of the first sealing layer during bonding between the substrates, since this flows down along the wall surface of the first sealing layer, contamination and poor adhesion of the panel are not generated. .

As described above, the present invention provides a seal paste in the first sealing layer in a state in which a groove-shaped first sealing layer capable of preventing the spread of the seal paste is formed at the edge portion of the back substrate to which the seal paste is to be applied. By forming the second sealing layer, the phenomenon in which the seal paste spreads to the inside and the outside of the panel by external pressure at the time of bonding the back substrate and the front substrate can be prevented, thereby contaminating the panel, or, It is possible to prevent poor bonding between the substrates can improve the reliability of the PDP.

Meanwhile, although specific embodiments of the present invention have been described and illustrated, modifications and variations can be made by those skilled in the art. Accordingly, the following claims are to be understood as including all modifications and variations as long as they fall within the true spirit and scope of the present invention.

Claims (6)

Forming address electrodes on the rear substrate; Applying a first dielectric layer to cover the address electrodes; Forming barrier ribs defining independent discharge spaces on the first dielectric layer portion corresponding to the display region, and forming a recessed first sealing layer on the first dielectric layer portion corresponding to the non-display region; Applying a phosphor between the barrier ribs; Forming a second sealing layer in the groove-shaped first sealing layer; Forming discharge sustaining electrodes on the front substrate; Applying a second dielectric layer to the entire surface of the discharge sustaining electrodes; Applying a protective layer on the second dielectric layer: Bonding the rear substrate and the front substrate to face the electrode arrangement surface by using a second sealing layer formed on the rear substrate; And And encapsulating a discharge gas in a discharge space defined by the barrier ribs. The method of claim 1, wherein the barrier rib and the groove-shaped first sealing layer are formed by a printing process using a screen mask. 3. The screen mask of claim 2, wherein the screen mask includes a first mask pattern for forming a partition on a portion of the screen mask, and a groove for forming a recessed first sealing layer on a portion of the screen mask. A method of manufacturing a plasma display panel, comprising two mask patterns. The method of claim 1, wherein the groove-shaped first sealing layer is formed of the same material as the partition wall. The plasma display panel of claim 1 or 4, wherein the groove-shaped first sealing layer is formed to be equal to or lower than the height of the partition wall. The method of claim 1, wherein the second sealing layer is coated by a printing process or an injection process using a dispenser.