KR20060036522A - Plasma display panel - Google Patents

Abstract

According to the present invention, there is provided a display device comprising: a front substrate having a display electrode covered by a dielectric layer; A rear substrate disposed to face the front substrate and formed so that an address electrode disposed to cross at right angles to the display electrode is covered by a dielectric layer; Barrier ribs formed on the rear substrate to form discharge cells coated with phosphors between the front substrate and the rear substrate; A seal aid disposed between the front substrate and the back substrate along the edges of the substrates; And a frit disposed to bond the seal aid and the substrate outside the seal aid.

Description

Plasma display panel and manufacturing method thereof

1 is a schematic exploded perspective view of a conventional plasma display panel.

2 is a schematic cross-sectional view of the plasma display panel shown in FIG. 1.

3 is a schematic cross-sectional view of an embodiment of a plasma display panel according to the present invention.

4 is a schematic cross-sectional view of another embodiment of a plasma display panel according to the present invention.

5 is a perspective view schematically showing an arrangement of a front substrate and a back substrate.

<Description of Symbols for Main Parts of Drawings>

11.12. 3. X display electrode on the substrate

4. Y display electrode 5. Address electrode

14,14 '. Dielectric Layer 15. Protective Layer

17. Bulkhead 18. Phosphor

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 an improved junction structure between a front substrate and a back substrate, and a method for manufacturing the same.

In general, a plasma display panel is used to display an image using a gas discharge phenomenon, and discharge occurs in a gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and emits a phosphor by radiation of ultraviolet rays. The light is excited by excitation.

FIG. 1 is a schematic exploded perspective view of a typical AC plasma display panel, and FIG. 2 is a schematic cross-sectional view of the plasma display panel shown in FIG. 1.

Referring to the drawings, a pair of transparent X display electrodes 3 and Y display electrodes 4 corresponding to the display electrodes are formed on the inner surface of the front substrate 11, and an address is formed on the inner surface of the rear substrate 12. The electrode 5 is formed. The display electrodes 3 and 4 are paired with an X electrode and a Y electrode to generate sustain discharge therebetween. The X and Y display electrodes 3 and 4 and the address electrode 5 are formed in strips on the inner surfaces of the front substrate 11 and the rear substrate 12, respectively, and the substrates 11 and 12 may be assembled together. When they cross at right angles to each other.

The dielectric layer 14 and the protective layer 15 are sequentially stacked on the inner surface of the front substrate 11. On the other hand, in the back substrate 12, the partition 17 is formed on the upper surface of the dielectric layer 14 ', and the cell 19 is formed by the partition 17. Cell 19 is filled with inert gases such as neon and xenon. In addition, the phosphor 18 is applied to a predetermined portion inside the partition wall 17 forming each cell 19. The bus electrode 6 is provided to prevent the phenomenon that the line resistance also increases as the lengths of the X and Y display electrodes 3 and 4 increase.

Referring to the operation of the plasma display panel, a high-voltage trigger voltage is applied to generate a discharge between the address electrode 5 and one display electrode. Discharge occurs when cations are stored in the dielectric layer 14 by the trigger voltage. When the trigger voltage exceeds the threshold voltage, the discharge gas or the like charged in the cell 19 becomes a plasma state by discharge, and is stable between the X display electrode 3 and the Y display electrode 4. Can be maintained. In this sustain discharge state, the light in the ultraviolet region collides with the phosphor 18 in the discharge light and emits light, so that each pixel formed for each cell 19 can display an image.

Meanwhile, as shown in FIG. 2, the front substrate 11 and the rear substrate 12 are bonded to each other by the frit 9. The frit 9 is disposed between the inner surface of the front substrate 11 and the rear substrate 12 and seals the substrates by heating.

In the conventional plasma display panel as described above, when heat sealing the frit 9, impurities generated in the frit 9 are introduced into the panel. That is, the impurities contained in the frit 9 are evaporated at the time of heat sealing and flow into the inside of the panel as well as the outside of the panel. After the heat sealing process of the panel, the air inside the panel is discharged through the exhaust process, but it is practically impossible to completely remove impurities because the internal structure of the panel is complicated despite the exhaust process. Therefore, impurities remaining inside the panel negatively affect the discharge of the discharge gas, thereby causing poor image quality.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an improved plasma display panel and a method of manufacturing the same.

It is another object of the present invention to provide a plasma display panel and a method of manufacturing the same, in which a bonding method of substrates is improved.

Another object of the present invention is to provide a plasma display panel and a method of manufacturing the same, in which impurities generated in the frit material during heat sealing are prevented from entering the inside of the panel.

In order to achieve the above object, according to the present invention,

A front substrate having a display electrode covered by the dielectric layer;

A rear substrate disposed to face the front substrate and formed so that an address electrode disposed to cross at right angles to the display electrode is covered by a dielectric layer;

Barrier ribs formed on the rear substrate to form discharge cells coated with phosphors between the front substrate and the rear substrate;

A seal aid disposed between the front substrate and the back substrate along the edges of the substrates;

And a frit disposed to bond the seal aid and the substrate outside the seal aid.

Also according to the invention,

A front substrate having a display electrode covered by the dielectric layer;

A rear substrate disposed to face the front substrate and formed so that an address electrode disposed to cross at right angles to the display electrode is covered by a dielectric layer;

Barrier ribs formed on the rear substrate to form discharge cells coated with phosphors between the front substrate and the rear substrate;

A seal aid disposed between the inner surface of one of the front substrate and the back substrate and the side of the other substrate;

And a frit disposed outside the seal aid along an interface between the seal aid and the one substrate, and along the interface between the seal aid and the other substrate.

According to one feature of the invention, the seal aid is a material such as the front substrate or the back substrate.

Also according to the invention,

Preparing a front substrate on which a display electrode covered by the dielectric layer is formed;

Preparing a rear substrate formed with the address electrode covered by the dielectric layer;

Forming a partition on the dielectric layer of the rear substrate and applying phosphor to cells between the partitions;

Disposing the front substrate and the back substrate facing each other, and disposing a seal aid along the edges of the substrates between the substrates;

And arranging the frit outside the seal auxiliary material to bond the frit to the seal auxiliary material and the substrates so that the frit is bonded to the substrate.

Also according to the invention,

Preparing a front substrate on which a display electrode covered by the dielectric layer is formed;

Preparing a rear substrate formed with the address electrode covered by the dielectric layer;

Forming a partition on the dielectric layer of the rear substrate and applying phosphor to cells between the partitions;

Disposing the front substrate and the rear substrate oppositely, and disposing a seal aid between an inner surface of one of the substrates and a side of the other substrate; And,

The frit is disposed outside of the seal aid along the interface between the seal aid and the one substrate and the interface between the seal aid and the other substrate so that the frit is placed against the seal aid and the substrates. A method of manufacturing a plasma display panel is provided, comprising: bonding a substrate by heat sealing.

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

3 is a cross-sectional view illustrating a schematic structure of a plasma display panel according to the present invention.

Referring to the drawings, the overall structure of the display panel according to the present invention may be substantially similar to that of the general plasma display panel described with reference to FIG. 2. A pair of transparent X display electrodes 32 and Y display electrodes 24 are formed on the inner surface of the front substrate 21, and an address electrode 35 is formed on the inner surface of the back substrate 22. The dielectric layer 24 and the protective layer 25 are sequentially stacked on the inner surface of 21. On the other hand, in the back substrate 22, the partition 27 is formed on the upper surface of the dielectric layer 24 ', and the cell is formed by the partition 27. The cells are filled with inert gases such as neon and xenon. In addition, a phosphor 28 may be applied to a predetermined portion inside the partition 27 forming each cell, and a bus electrode (not shown) may be provided on the X and Y display electrodes 3 and 4.

According to a feature of the invention, a seal aid is arranged between the inner surfaces of the substrates, and the frit is heat sealed to the outside of the seal aid. In the example shown in FIG. 3, a seal aid 37 is disposed between the inner surface of the front substrate 21 and the inner surface of the back substrate 22, and the frit 39 is heated outside the seal assistant 37. By sealing, the bonding between the front substrate 21 and the back substrate 22 is achieved. It is preferable that the seal auxiliary material 37 is the same glass material as a front substrate or a back substrate, for example. The seal aid 37 prevents the frit 39 from coming into direct contact with the inside of the panel. Even when the frit 39 is heated, impurities generated in the frit 39 are blocked by the seal aid 37. It does not flow into the inside of the panel.

The seal aid 37 extends along the edges in the transverse and longitudinal directions of the substrates between the inner surface of the front substrate 21 and the inner surface of the back substrate 22. In addition, the frit 39 is disposed in such a manner that the front substrate 21 and the rear substrate 22 cover the portion in contact with the seal aid 37 so that heat sealing can be performed.

4 is a schematic cross-sectional view of another embodiment of a plasma display panel according to the present invention.

Referring to the drawings, the structure of the overall panel is similar to the example shown in Fig. 3, and the same components denoted by the same reference numerals will not be described further.

According to another feature of the invention, the seal aid is disposed in contact with the inner surface of one substrate and the side of the other substrate, and the frit is arranged to seal the interface between the seal aid and the substrate. In the example shown in FIG. 4, the seal aid 47 is disposed in contact with the inner surface of the front substrate 21 and the side surface of the back substrate 22, and the frit 49a is the seal aid 47 and the front substrate 21. ) And the frit 49b are shown disposed at the interface between the seal aid 47 and the back substrate 22. The cross section shown in FIG. 4 shows the lateral direction of the plasma display panel (the direction indicated by A and A 'in FIG. 5), and the end of the front substrate 21 protrudes past the end of the back substrate 22. In contrast, in the up and down direction of the plasma display panel (the direction indicated by B and B 'in FIG. 5), the end portion of the rear substrate 22 protrudes beyond the end portion of the front substrate 21, so that the seal aid is formed of the rear substrate 22. It is disposed in contact with the inner surface of the substrate and the side surface of the front substrate 21, the frit is arranged so as to seal the interface between the sealing aid and the substrate.

Unlike the embodiment shown in FIG. 3, in the example shown in FIG. 4, since the seal aid 47 is not disposed between the substrates 21 and 22, the height of the seal aid 47 is increased by the substrates 21 and 22. There is no direct effect on the spacing between them.

In the plasma display panel according to the present invention, direct contact between the frit and the inside of the panel can be avoided during sealing and evacuation, so that the discharge can be stabilized. In fact, it is understood that the plasma display panel according to the present invention is superior to the conventional plasma display panel by measuring the light emission signal delay at the address signal input at a position inside the panel close to frit. According to the experiment, it can be seen that in the plasma display panel according to the present invention, the deviation of the address delay delay time is 180 ns, whereas in the conventional plasma display panel, the uniformity of discharge is improved by 40% as 320 ns.

On the other hand, in the plasma display panel according to the present invention, an increase in peripheral luminance of the light emitting unit may be reduced. In more detail, when a part of the plasma display panel is turned on as a still image and sustained and discharged with a certain pattern, after a predetermined time, when the whole is switched to the same monochromatic pattern, the part where the sustained discharge has been left remains afterimage. do. The outermost part of the image remains brighter than the pattern, which is called halo. Due to this halo phenomenon, the boundary of the pattern is more clearly visible, and thus, the afterimage is more clearly visible. In the case of the panel according to the present invention, such a halo phenomenon can be reduced. In the following table, a portion of the panel was turned on as a still image, a constant pattern was turned on, sustained discharge was carried out at full gradation, and after a predetermined time, the luminance was measured at three positions after switching to the same monochromatic pattern.

1. Pattern 2. The area just outside the pattern 3. Non pattern part Example 97% 103% 100% Comparative example 96% 110% 100%

As can be seen from the above table, it can be seen that the brightness increase phenomenon in the portion just outside the pattern is reduced by about 7% than the comparative example.

The plasma display panel and the method of manufacturing the same according to the present invention have an advantage that impurities generated from frits are introduced into the panel during heat sealing of the plasma display panel. Therefore, the stability of the discharge of the plasma display panel is improved, and the phenomenon of increasing the luminance around the light emitting unit can be prevented.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true scope of the invention should be defined only by the appended claims.

Claims (5)

A front substrate having a display electrode covered by the dielectric layer; A rear substrate disposed to face the front substrate and formed so that an address electrode disposed to cross at right angles to the display electrode is covered by a dielectric layer; Barrier ribs formed on the rear substrate to form discharge cells coated with phosphors between the front substrate and the rear substrate; A seal aid disposed between the front substrate and the back substrate along the edges of the substrates; And a frit disposed to bond the seal aid and the substrate outside the seal aid. A front substrate having a display electrode covered by the dielectric layer; A rear substrate disposed to face the front substrate and formed so that an address electrode disposed to cross at right angles to the display electrode is covered by a dielectric layer; Barrier ribs formed on the rear substrate to form discharge cells coated with phosphors between the front substrate and the rear substrate; A seal aid disposed between the inner surface of one of the front substrate and the back substrate and the side of the other substrate; And a frit disposed outside the seal aid along an interface between the seal aid and the one substrate, and along the interface between the seal aid and the other substrate. The method according to claim 1 or 2, And said seal aid is made of the same material as said front substrate or back substrate. Preparing a front substrate on which a display electrode covered by the dielectric layer is formed; Preparing a rear substrate formed with the address electrode covered by the dielectric layer; Forming a partition on the dielectric layer of the rear substrate and applying phosphor to cells between the partitions; Disposing the front substrate and the back substrate facing each other, and disposing a seal aid along the edges of the substrates between the substrates; Arranging a frit outside the seal aid to bond the frit to heat seal with the seal aid and the substrates, thereby bonding the substrate. Preparing a front substrate on which a display electrode covered by the dielectric layer is formed; Preparing a rear substrate formed with the address electrode covered by the dielectric layer; Forming a partition on the dielectric layer of the rear substrate and applying phosphor to cells between the partitions; Disposing the front substrate and the rear substrate oppositely, and disposing a seal aid between an inner surface of one of the substrates and a side of the other substrate; And, The frit is disposed outside of the seal aid along the interface between the seal aid and the one substrate and the interface between the seal aid and the other substrate so that the frit is placed against the seal aid and the substrates. Bonding the substrates by heat sealing; and manufacturing the plasma display panel.

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