KR100808178B1 - A Lamination Apparatus, An Upper plate of Plasma Display Panel made by using the Lamination Apparatus, and A Method for manufacturing the upper plate of Plasma Display Panel - Google Patents

Abstract

The present invention relates to an upper substrate of a plasma display panel for lowering a discharge start voltage of the plasma display panel, a method of forming the same, and a lamination apparatus.

The present invention glass plate; A transparent electrode formed on a portion of an upper portion of the upper glass; A bus electrode formed on an upper portion of the transparent electrode; An upper plate dielectric formed on the upper plate glass, the transparent electrode, and the bus electrode, and having grooves formed on a surface of the upper plate glass at intervals equal to a pitch of a lamination device; And a passivation layer formed on the upper plate dielectric.

Therefore, according to the present invention, it is possible to easily form the upper substrate of the plasma display panel in which the differential dielectric is formed.

Plasma display panel (PDP), differential dielectric, discharge start voltage

Description

Lamination Apparatus, An Upper plate of Plasma Display Panel made by using the Lamination Apparatus, and A Method for manufacturing the upper plate of Plasma Display Panel

1 is a view showing a conventional plasma display panel.

2 shows an upper substrate of a plasma display panel in which a differential dielectric is formed;

Figure 3a is a diagram showing the lamination process of the green sheet using a conventional lamination equipment.

3B is a view showing a state in which a protective film is removed from a green sheet laminated to an upper substrate of a plasma display panel and baked.

Figure 4 shows a lamination device according to the present invention.

5 is a view showing a process of forming a differential dielectric with a lamination device according to the present invention.

Figure 6 is a PDP top plate glass formed with a differential dielectric produced by the method according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10 lower glass 30 address electrode

40: lower plate dielectric 50: partition wall

55 black matrix 60 phosphor

70: top glass 73: sustain electrode

76: bus electrode 80: top dielectric

85: protective film 90: discharge gas

100: lower plate 150: upper plate

280: differential dielectric 380: dielectric green sheet

382: protective film 395: lamination device

400a: groove 400b: surface of lamination device

655: black matrix 670: ITO electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), which is one of new image display devices in the multimedia era, and more particularly to a front filter of a PDP.

With the advent of the multimedia era, display devices that can express more detailed, larger, and more natural colors are required.

However, there is a limit to the current CRT (Cathode Ray Tube) structure or LCD (Liquid Crystal Display) method to compose a large screen larger than 40 inches, PDP is attracting the spotlight among flat panel display devices, and expands its use in the field of high quality image. For this purpose, high-resolution and large screens are rapidly developing.

The biggest feature of PDP is that it can be made as thin as 10cm or less compared to the same self-luminous CRT, and it is easy to manufacture large flat screen (60 ~ 80inch), and also in terms of style and design, it is different from conventional CRT. It is clearly distinguishable.

PDP is thin, light, self-luminous and enables real-time, realistic images, simple structure, and easy to produce large-screen flat panel display, and has been qualified for HDTV (high definition TV) since early.

Compared with LCD, it is a self-luminous type, so you can see beautiful and beautiful screens over a wide range of left and right.

Especially, since the screen replacement time is 10 times faster than LCD, it is the most suitable TV for displaying moving images.It is bright because it is a video display method in a fixed pixel by dot matrix method, and color deviation and screen skew Without the influence of the magnetic field at all, it can be said to be the best TV for a large screen, high-definition video.

The PDP has a phosphor in a pixel defined by a partition wall, and includes a lower plate having an address electrode at each lower portion of the phosphor, and an upper plate having a bus electrode and a sustain electrode opposed to the address electrode of the lower plate.

1 is a cross-sectional view of the PDP.

Referring to Figure 1, the structure of the PDP according to the prior art will be described.

An underlayer 20 is positioned on the lower plate glass 10, and an address electrode 30 is positioned on a portion of the underlayer 20, and is disposed on upper surfaces of the underlayer 20 and the address electrode 30. The lower plate dielectric 40 is located.

The upper part of the lower plate dielectric 40 is formed with a partition wall 50. The partition wall 50 has a longer vertical direction than a horizontal direction and is spaced apart from the address electrode 30 by a predetermined distance.

A black matrix 55 is positioned on an upper surface of the partition 50, and a phosphor 60 is positioned on the side surfaces of the black matrix 55 and the partition 50 and an upper surface of the lower plate dielectric 40. .

The above is the structure of the PDP lower plate 100 and the structure of the PDP upper plate 150 will be described below.

The sustain electrode 73 and the bus electrode 76 are sequentially stacked on the lower surface of the upper plate glass 70, and the upper plate dielectric is formed on the lower surface of the upper plate glass 70, the sustain electrode 73 and the bus electrode 76. 80) is located.

A protective film 85 is positioned on a lower surface of the upper dielectric 80, and the protective film 85 is formed parallel to the upper dielectric 40 and spaced apart from the upper surface of the black matrix 55 by a predetermined distance. The upper and lower panels of PDP are combined.

At this time, the discharge gas 90 is injected into the discharge cells defined by the PDP upper plate 150, the lower plate 100, and the partition wall 50. The discharge gas 90 is He-Xe or Ne- as an inert gas. Xe or He-Ne-Xe gas or the like is injected.

The operation of the conventional plasma display panel described above is as follows.

When a voltage is applied to the address electrode 30, the bus electrode 76, and the sustain electrode 73 to generate a voltage difference between the upper plate and the lower plate electrodes, the voltage difference is formed in the discharge cell defined as the partition wall 50, the upper plate, and the lower plate. A gas such as He-Xe, Ne-Xe, or He-Ne-Xe, which is a discharge gas 90, becomes a plasma state and ultraviolet rays are generated.

The generated ultraviolet rays excite the phosphor 60 to generate red, green, or blue visible light. The generated visible light is determined according to the type of the phosphor 60. Accordingly, each of the discharge cells It is red, green or blue.

The generated visible light is emitted to the outside through the transparent top dielectric 80 and the top glass 70.

The upper plate dielectric 80 is in direct contact with the sustain electrode 73 using the transparent electrode ITO and the bus electrode 76 serving as the metal electrode, and thus the chemical reaction between the sustain electrode 73 and the bus electrode 76 is performed. PbO-based glass with high softening point is used to avoid.

The top dielectric 80 and the top glass 70 serve to transmit visible light generated from the phosphor 60 with a predetermined transmittance.

The dielectric layer of the PDP upper plate is formed by screen printing using a dielectric paste and laminating using a dielectric green sheet.

First, the screen printing method forms a dielectric paste on the upper substrate on which the bus electrode is formed by screen printing, and finally forms a dielectric through a baking process.

In the green sheet method, the dielectric layer is pressed through a lamination process using a dielectric green sheet already prepared on the upper substrate on which the bus electrode is formed, and finally the dielectric layer is formed through the firing process.

3A to 3B are diagrams showing a process for forming a dielectric layer by a conventional green sheet method.

3A to 3B, the green sheet method will be described in detail.

The dielectric green sheet 380 is laminated using a roller 395 on the upper plate glass 370 on which the bus electrode 376 is formed (FIG. 3A), the protective film 382 is removed, and then fired. Finally, a dielectric layer is formed (Fig. 3b).

However, the conventional method of forming the PDP upper dielectric layer has the following problems.

PDP is a display device that generates a plasma in the pixel to display visible light, there is a disadvantage that the discharge start voltage of the plasma is higher than about 200V.

The greatest influence on the discharge start voltage of the plasma is the dielectric constant of the top dielectric, and in particular, reducing the thickness of the dielectric between the sustain electrodes at which the discharge is initiated increases the dielectric constant, which in turn reduces the discharge voltage.

FIG. 2 shows a PDP top plate on which a differential dielectric is formed, and a sustain electrode 273 and a bus electrode 276 are formed on the top glass 270, and the top dielectric 280 is disposed between the sustain electrodes 273. It is formed by making the thickness thinner.

However, the differential dielectric 280 is only conceptually developed, and it is difficult to manufacture by the conventional screen printing method or the green sheet method, and has a disadvantage of introducing a separate process.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lamination device for forming a differential dielectric on the upper substrate of the plasma display panel.

Another object of the present invention is to provide a method for easily forming a differential dielectric on an upper substrate of a plasma display panel by the lamination device.

Another object of the present invention is to provide an upper substrate of a plasma display panel in which a differential dielectric is formed by the lamination device.

In order to achieve the above object, the present invention is a top glass; A transparent electrode formed on a portion of an upper portion of the upper glass; A bus electrode formed on an upper portion of the transparent electrode; An upper plate dielectric formed on the upper plate glass, the transparent electrode, and the bus electrode, and having grooves formed on a surface of the upper plate glass at intervals equal to a pitch of a lamination device; And a passivation layer formed on the upper plate dielectric.

The present invention comprises the steps of forming a transparent electrode on the upper portion of the upper glass; Forming a bus electrode on an upper portion of the transparent electrode; Forming a top dielectric on top of the top glass, the transparent electrode, and the bus electrode using a lamination device having a plurality of grooves formed on a surface thereof; And forming a protective film on the upper plate dielectric.

The present invention provides an apparatus for laminating a green sheet on a substrate, wherein a plurality of grooves are formed on a surface thereof.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

The same components as in the prior art are given the same names and the same reference numerals for convenience of description, and detailed description thereof will be omitted.

4 is a view showing a lamination device according to the present invention.

4, the lamination apparatus according to the present invention will be described.

Lamination apparatus 400 according to the present invention is basically the same as the conventional lamination apparatus, but different in that it has a plurality of grooves (400a) on the surface (400b), preferably should have the shape of a roller (roller) .

That is, when laminating a green sheet on the PDP top plate with the lamination device 400, a differential dielectric may be formed by the height difference between the plurality of grooves 400a and the surface 400b. have.

Preferably, the spacing between the plurality of grooves 400a should be equal to the spacing between each electrode of the upper surface of the PDP.

After laminating the green sheet to the PDP top plate, the green sheet portion compressed by the plurality of grooves 400a has a thick top dielectric, and the green sheet portion pressed by the surface 400b has a thick top dielectric. It is thin, resulting in a differential dielectric.

5 is a view showing a process of forming a differential dielectric with a lamination device according to the present invention.

Referring to FIG. 5, an upper substrate and a method of forming the plasma display panel according to the present invention will be described.

First, the transparent electrode 573, the black matrix 555, and the bus electrode 576 are formed on the upper glass 570.

The transparent electrode should preferably be an indium-tin-oxide (ITO) electrode.

The black matrix 555 pattern may be formed to correspond to the partition wall according to the manufacturer, and may be located in an area corresponding to the gap between the sustain electrode pairs as shown in FIG. 5. The plasma display panel absorbs external light to generate reflected light. It serves to prevent.

The green sheet 580 is stacked on the top glass 570 of the plasma display panel on which the black matrix 555 and the electrode pattern are formed.

The green sheet 580 is a binder for maintaining viscosity in the glass powder, a plasticizer for providing flexibility to prevent curing, a solvent and a small amount of additives for dissolving the binder and the plasticizer is dried, and then dried The slurry is formed by processing to a constant thickness with a tape casting method.

In addition, since the upper dielectric 580 is in direct contact with the sustain electrode 573 using ITO as a transparent electrode and the bus electrode 576 as a metal electrode, the green sheet 580 is preferably the sustain electrode 573. PbO-based glass having a high softening point is used to avoid the chemical reaction between the c) and the bus electrode 576.

In order to increase the adhesive strength of the upper glass 570 of the plasma display panel on which the green sheet 580 is stacked, a plurality of grooves 500a are formed on the surface 500b to form a differential dielectric. A crimping process is performed using the formed lamination apparatus 500.

In addition, the lamination process should be performed in the same direction as the electrode pattern formed on the upper glass 570 of the plasma display panel, so that the thickness of the dielectric between each electrode can be made thin.

That is, since the green sheet 580 is in a solid state, a pressing process of applying a constant pressure to increase the adhesive strength is required.

After the crimping process, the protective film 582 is removed on the green sheet 580 to protect the surface contacting the lamination device 500 in the crimping process, and a firing process is performed. As described above, a differential dielectric is formed on the upper glass of the plasma display panel.

Specifically, in the lamination process, the portion where the groove 500a of the lamination device 500 is pressurized has a thick dielectric material, and the portion where the surface 500b portion of the lamination device is pressurized has a thickness of the dielectric material. Is thin, and as a result, a differential dielectric is formed.

Although the laminating apparatus 500 illustrated in FIG. 5 has only three grooves 500a according to the electrode pattern of the upper glass 570 of the plasma display panel, in reality, the plurality of grooves 400a are illustrated in FIG. 4. Must have

In addition, the plurality of grooves 400a may be spaced apart by the same distance as each electrode gap to form a differential dielectric according to an object of the present invention.

6 is a PDP upper glass having a differential dielectric formed by the method according to the present invention.

Subsequently, a protective film is formed on the differential dielectric 680. Since the protective film needs to use a material having excellent light transmittance in order to improve display characteristics of the PDP, MgO is generally used.

The present invention is not limited to the above-described embodiments, and such modifications are included within the scope of the present invention even though modifications may be made by those skilled in the art to which the present invention pertains.

The lamination apparatus according to the present invention described above, the upper substrate of the plasma display panel manufactured using the same and the effect of the method of forming the same will be described.

First, according to the lamination apparatus and the method of manufacturing the upper substrate of the plasma display panel using the lamination apparatus, it is possible to easily form a differential dielectric on the upper substrate of the plasma display panel.

Second, the plasma display panel manufactured by the lamination device and the manufacturing method may lower the discharge start voltage of the plasma.

Claims (10)

A transparent electrode and a bus electrode sequentially formed on the upper plate glass; A dielectric provided on the transparent electrode and the bus electrode and having grooves formed at equal intervals from a pitch of the lamination device to form a differential structure; And And a passivation layer formed on the dielectric. The method of claim 1, wherein the groove, And a plasma display panel formed in the same direction as that of the transparent electrode and the bus electrode. According to claim 1, The lamination device, And a groove formed on a surface thereof at the same pitch as that of the transparent electrode. Sequentially forming a transparent electrode and a bus electrode on the upper glass; Using a lamination device having a plurality of grooves formed on a surface thereof, forming a dielectric having a differential structure on the transparent electrode and the bus electrode; And And forming a protective film on the dielectric. The method of claim 4, wherein the forming of the dielectric comprises: And matching the grooves between the transparent electrodes and rolling the lamination device to form a height of a dielectric formed on the transparent electrode. The method of claim 4, wherein the plurality of grooves, A plasma display panel manufacturing method, characterized in that spaced apart from each other by the same pitch as the transparent electrode. delete delete delete delete

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