KR100760760B1 - Method of forming plasma display panel - Google Patents

Abstract

A plasma display panel and a method for forming the same are provided to shorten an exhaust and discharge gas implantation period by improving a composition of a barrier rib. An address electrode(120) of driving electrodes is formed on a front substrate(110). A first dielectric layer(130) is formed on the substrate including the address electrode. A sustain electrode(140) of the driving electrodes is formed on the first dielectric layer. A second dielectric layer(150) is formed on the substrate including the sustain electrode. A barrier rib(220) is formed on a rear substrate of two substrates. The rear substrate including the barrier rib and the front substrate including the second dielectric layer are attached to each other. The barrier rib of a grating structure is formed on the rear substrate in order to surround each of discharge cells. The thickness of the barrier rib is different according to positions of the discharge cells. The barrier rib is fixed to the substrate by performing a baking process at temperature higher than softening temperature for a constant time.

Description

Method of Forming Plasma Display Panel {Method of Forming Plasma Display Panel}

1A and 1B are graphs showing a vacuum exhaust phenomenon in the case of a plasma display panel in which an address electrode and a sustain electrode are formed on separate substrates, and in the case of a top plate integrated plasma display panel;

2 is a plan view of a portion of a display area when a partition wall formed according to an embodiment of the present invention is viewed in a direction perpendicular to the substrate;

3 is a perspective cross-sectional view of a portion of a plasma display panel showing a partition and an electrode arrangement formed according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view showing a cross section of the substrate and the partition wall when cut along the line CC in FIG. 2, showing the form before firing and the form after firing. FIG.

* Explanation of symbols for the main parts of the drawings

220: partition 222: partition formed in the longitudinal direction

224: barrier rib formed in the transverse direction 110: the front substrate

120: address electrode 130: first dielectric layer

140: sustain electrode 150: second dielectric layer

160: protective film 210: back substrate

230: phosphor

The present invention relates to a plasma display panel, and more particularly, to the shape and arrangement of partition walls and electrodes of the plasma display panel.

In the plasma display device, a partition wall is formed to have a predetermined distance between two opposing substrates, a driving electrode for inducing a discharge in a discharge cell divided by the partition wall, a phosphor is installed, and a discharge gas is injected into an internal space. A flat panel display device using a Plasma Display Panel (PDP, hereinafter referred to as a panel) having a sealed shape in a closed state.

Plasma displays can be formed thinner than Cathode ray tube (CRT) displays, which occupy a large volume, and thus are suitable for realizing a large screen with a relatively small volume. In addition, the plasma display device does not need to form an active element such as a transistor as compared to other flat panel display devices such as LCDs, and has a general characteristic of wide viewing angle and high luminance.

In the plasma display panel, many pixels for displaying a screen are arranged in a matrix form. The arrangement of pixels, often referred to as a matrix form, is specifically made by formation of partitions and electrodes.

The partition wall may be formed on any one of the two substrates, the front substrate and the back substrate constituting the panel, or formed together on the two substrates, or formed separately from the two substrates, and then joined together with the substrates during the alignment and lamination operation for forming the panel. have. The electrode may be formed on one substrate or divided into two substrates, or may be formed on a substrate and a partition wall.

In the shape of the partition wall, the partition wall may be formed of a stripe shape having only a straight line in the column direction along with one of the driving electrodes, for example, a lattice shape partitioning each discharge cell in the row direction and the column direction. In addition, the partition wall is formed in a honeycomb shape to form hexagonal discharge cells in addition to the quadrangular discharge cells, or the partition wall formed in the form of an intermediate shape between the stripe and the hexagonal discharge cell structure has a narrow or wider space therebetween, so that the discharge is almost hexagonal. It can also be a meander form of cells.

Each discharge cell constituting the pixel is preferably made so as not to be affected by the discharge from the adjacent discharge cells in order to properly display the screen with high resolution in terms of color tone or shape. Therefore, in general, the driving electrode is formed such that address discharge is performed only in one discharge cell where these electrodes intersect when a signal is applied to a specific scan electrode and a specific address electrode so that independent driving of each discharge cell is performed. .

However, when the panel is formed so as to prevent a gap between the partition walls and the substrate between the discharge cells in order to prevent cross talk with adjacent discharge cells during cell discharge, there may be a problem in the exhaust of air in the panel and injection of discharge gas. Can be. For example, in the case where each discharge cell area is completely surrounded by the partition wall, if there is no gap between the partition wall and the substrate, the exhaust process and the discharge gas injection process for the space between the substrates after sealing are impossible or difficult. This problem is less important when a part of the partition wall forming the discharge cell is open, such as a stripe type or meander type.However, even in this type, if there is no gap between the partition wall and the substrate, the injection and exhaust of discharge gas is time-consuming. Can cause problems.

In addition, in the case of a top plate integrated structure in which most structures such as electrodes other than the partition wall are formed on the front substrate, the partition wall tends to be formed in a uniform width at a predetermined width on the rear substrate, so that a gap between the front substrate and the partition wall is less likely to occur. Discharge gas injection can be more difficult. 1A and 1B are graphs illustrating a vacuum exhaust phenomenon in the case of a plasma display panel in which an address electrode and a sustain electrode, which are one driving electrodes, are formed on separate substrates, and in the case of a top plate integrated plasma display panel. A diagram showing the difficulty of exhausting. The five peaks each represent five pumpings, and in the case of the upper plate integrated type, the pressure hardly decreases until a certain time period passes even after five pumpings.

An object of the present invention is to provide a plasma display panel having a barrier rib structure suitable for exhaust gas.

In addition, an object of the present invention is to provide a plasma display panel forming method capable of forming a gap capable of smoothly evacuating even without a special additional step for forming a partition.

Plasma display panel of the present invention for achieving the above object, two substrates that are spaced apart at regular intervals to form a sealed space with the surrounding sealing material, partition wall installed to partition the space between the two substrates to form a discharge cell At least two drive electrodes formed on either of the opposing surfaces or partition walls of the two substrates, a discharge gas and a phosphor filled in the space,

When viewed in a direction perpendicular to the substrate, that is, in a plan view, the discharge cells are completely surrounded by the partition walls, and the thickness of the partition walls surrounding each of the discharge cells is partially different, so that the partition wall thickness is increased. In a thin portion, the gap between the partition and the substrate is characterized in that a wider than the gap between the partition and the substrate in the thick portion of the partition wall thickness.

In another aspect, the present invention may be characterized in that, in place of the gap between the substrate and the partition wall, a portion having a thicker thickness of the partition wall has a higher height than the thin portion.

In the present invention, in the upper plate integrated lattice partition structure in which most structures such as electrodes except for most of the partition walls are disposed on the front substrate, the thickness of the partition walls formed in the longitudinal direction is thinner than the thickness of the partition walls formed in the transverse direction, and the height may be lower. . In particular, the partition wall formed in the transverse direction may be formed such that the electrodes related to the sustain discharge among the driving electrodes overlap the partition wall in plan view.

In the plasma display panel forming method of the present invention, in the conventional plasma display panel forming method, when the partition wall surrounding each discharge cell in a lattice form is formed on the substrate, the thickness of the partition wall is different for each position surrounding the discharge cell. And firing at a temperature higher than the softening temperature of the partition wall for a predetermined time to fix the partition wall to the substrate.

In the method of the present invention, each discharge cell is a quadrangular shape formed in the longitudinal direction, and the partition wall is formed thick in the transverse direction, and formed thin in the longitudinal direction so that the gap between the partition wall and the substrate is long at the long side of the discharge cell, so that the exhaust or discharge Most of the gas injection can be done through these gaps.

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

2 is a plan view of a portion of a display area when a partition wall formed according to an exemplary embodiment of the present invention is viewed in a direction perpendicular to the substrate.

3 is a perspective cross-sectional view of a portion of a plasma display panel showing a partition and an electrode arrangement formed according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a cross section of the substrate and the partition wall when cut along the line CC in FIG. 2, showing the form before firing and the form after firing. FIG.

2 and 3, there is shown a panel structure, which may be referred to as a top plate integrated. The address electrode 120 is formed on the front substrate 110 forming the screen, and the first dielectric layer 130 is stacked thereon. The address electrode 120 is usually formed of a metal, and when formed in a wide width, the address electrode 120 is formed to be thin because the opening ratio is reduced by covering an area where light is emitted from the discharge cell. The address electrode may also be formed of a transparent electrode such as indium tin oxide (ITO) and a thin metal bus electrode in contact with the transparent electrode.

The scan sustain electrode and the common sustain electrode which form the sustain electrode 140 are formed on the substrate on which the first dielectric layer 130 is formed. When viewed in a direction perpendicular to the substrate surface from the front substrate 110 side, the storage electrode 140 is formed to overlap the center of the partition wall 224 formed laterally on the screen. In some cases, the barrier layer may be partially formed on the first dielectric layer 130 to form a portion of the barrier rib, and a sustain electrode may be formed on the barrier layer. A passivation layer 160 made of magnesium oxide and a second dielectric layer 150 is further formed on the entire surface of the substrate on which the storage electrode 140 is formed.

When the sustain electrode 140 is formed to overlap the partition wall as described above, driving of an alternative lightening of surface (ALiS) method may be required to independently drive the upper row and the lower row of each pixel.

Meanwhile, the partition wall 220 is formed on the rear substrate 210. The partition wall may be formed by, for example, a sandblasting method. The sand blasting method is a step of evenly applying a partition paste in which a filler, glass powder, a binder and a solvent are mixed on a substrate, volatilizing the solvent in the partition paste to temporarily fix the paste layer to the substrate, and the paste layer Arranging and attaching the dry film cured by exposure thereon, selectively exposing the dry film using an exposure mask, developing and leaving only the partition wall portion, and pasting the paste layer in the region where the dry film is removed by sandblasting. Etching to form a partition wall, it may comprise a step of removing the dry film.

After the partition wall is formed of the paste layer, the paste layer is calcined to finally fix the partition wall 220 to the substrate 210. At this time, the firing temperature is a temperature slightly higher than the softening temperature of the mixture constituting the paste layer, such as 530 degrees Celsius, which is a little higher than the softening temperature of the glass (the softening temperature may vary in a considerable range depending on the glass degree composition. have). The partition paste layer softens during the firing period and has a liquid-like characteristic for a long time. Thus, some changes occur from the original etched angled shape to the rounded shape like water droplets as compared to FIG. 4. At this time, since the paste layer partition wall 224 ′ has a wide cross-sectional shape similar to the rounded water droplets at the beginning of the partition wall, the deformation of the height does not occur greatly when forming the partition wall 224 formed in the transverse direction.

On the other hand, when the width of the barrier rib is narrow, a cross section perpendicular to the longitudinal direction in which the paste layer barrier rib 222 'is formed has an elongated and narrow cross-sectional shape. The bulkhead 222 formed in the longitudinal direction is changed a lot, so that the height is also reduced. As a result, the partition wall has a difference d in forming height depending on its position.

The rear substrate 210 on which the partition wall 220 is formed and the front substrate 110 on which various kinds of driving electrodes are formed are aligned and sealed. The phosphor 230 is usually laminated on the back substrate 210 on which the partition wall 220 is formed, and the panel is completed with subsequent processes such as exhaust and discharge gas injection on the sealed panel.

The partial height change of the partition wall 220 formed on the rear substrate 210 is a front substrate on the side of the thin, longitudinally formed partition wall 222 corresponding to the long side of each discharge cell in the planar configuration as shown in FIG. The gap with (110) is enlarged so that intake and exhaust are mainly composed of this gap. Furthermore, in the present embodiment, since the sustain electrode 140 overlaps the partition wall 224 formed in the transverse direction with a small change in height, the sustain electrode 140 is exposed to a gap caused by the height change of the partition wall, which is not good for adjacent discharge cell discharge. The influence can be prevented.

According to the present invention, it is possible to have a partition structure suitable for exhaust and discharge gas injection in a plasma display panel, and a method suitable for forming such a panel can be provided, thereby saving time consumed for exhaust and discharge gas injection, and exhausting. The occurrence of defects in the gas injection process can be reduced.

Claims (7)

delete delete delete delete delete delete Two substrates spaced at regular intervals to form a sealed space together with a surrounding sealing material, a partition wall partitioning the space between the two substrates to form a discharge cell, either one of the opposite surfaces of the two substrates or the partition wall A method of forming a plasma display panel comprising at least two types of driving electrodes formed on the substrate, a discharge gas and a phosphor filled in the space, Forming an address electrode among the driving electrodes on a front substrate among the two substrates, laminating a first dielectric layer on the substrate on which the address electrode is formed, forming a sustain electrode among the driving electrodes on the first dielectric layer, the Forming a second dielectric layer on the substrate on which the sustain electrode is formed, forming a partition on the rear substrate among the two substrates, and aligning and sealing the rear substrate on which the partition wall is formed and the front substrate on which the second dielectric layer is formed. , When the barrier ribs are formed on the rear substrate so as to surround each of the discharge cells in a lattice shape, different thicknesses of the barrier ribs are formed according to positions surrounding the discharge cells; And firing at least a predetermined time at a temperature equal to or greater than the softening temperature of the barrier rib to fix the barrier rib to the substrate.

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