KR20070000797A - Plasma display panel and plasma display device - Google Patents

Abstract

A plasma display panel and a plasma display device are provided to independently drive respective discharge cell by enlarging discharge gap according to oppositely discharging structure. A plasma display device includes two substrates(110,210), an isolating wall(220), a driving electrode for image display, and a discharge gas for filling void, and a fluorescent layer(230). The void is formed by the two substrates and sealing material. The void is formed by the isolating wall between the two substrates. The fluorescent layer is deposited on part of the substrates and the isolating wall. The isolating wall is formed in delta shape in order to form a pixel by arranging triangle shape. Common electrodes for maintain discharge are installed at the isolating wall, and oppositely formed in a discharge cell.

Description

Plasma display panel and plasma display device

1 and 2 are a perspective view and a plan view showing a rectangular discharge cell structure of a plasma display panel having a delta partition structure according to embodiments of the present invention;

3 is a schematic cross-sectional view showing a vertical section cut along the line AA of FIG.

4 is a plan view showing a discharge cell electrode configuration in an embodiment having a hexagonal discharge cell delta partition structure according to the present invention;

FIG. 5 is a plan view illustrating another embodiment in which branches are formed on the address electrodes instead of the transparent electrodes in the configuration of FIG. 4.

* Explanation of symbols for the main parts of the drawings

110: front substrate partition 125,325: address bus electrode

121,321: ITO electrode 130,150: dielectric layer

140,145,340,345: sustain electrode 160: protective layer

210: rear substrate 220: partition wall

230: phosphor layer 331: branch (electrode)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a plasma display device, and more particularly, to the shape and arrangement of partition walls and electrodes in a panel of the plasma display device.

Plasma display panels are formed by forming electrodes on two opposing substrates, overlapping them at regular intervals, injecting a discharge gas therein, and sealing the plasma display panel (PDP). Refers to a flat panel display device. The plasma display device is formed by forming a plasma display panel and installing elements necessary for screen realization such as a driving circuit connected to each electrode of the panel.

In the plasma display panel, many pixels for displaying a screen are arranged in a matrix form. In the plasma display panel, each pixel is driven in a manner of simply applying a voltage to an electrode, that is, a passive matrix method, without an active element for driving the pixel. The plasma display panel may be classified into a direct current type and an alternating current type according to the shape of the voltage signal for driving each electrode, and may be divided into an opposing type and a surface discharge type according to the arrangement of the two electrodes to which the sustain discharge voltage is applied.

In the case of the alternating current type, since the electrode is covered with the dielectric layer, it naturally has a capacitance, the current flowing through the electrode is limited, and the electrode is easily protected from the ion shock during discharge. As a result, the electrode lifetime is also long.

In the case of the surface discharge type, since the two electrodes for sustain discharge are on the same side, a high discharge voltage is required compared to the distance between the electrodes. On the other hand, when the distance between the electrodes is approached to lower the discharge voltage, the discharge may occur substantially only in a limited portion between the electrodes, thereby lowering the visible light generation efficiency and decreasing the luminance. In particular, when the electrode is formed on the front side emitting light while the size of each discharge cell decreases with high resolution, the opening ratio decrease by the electrode in each discharge cell becomes serious.

In order to overcome the problem of the surface discharge type, the sustain electrode may be formed in the partition wall so as to overlap the partition wall when the screen is viewed, so that the two types of sustain electrodes for discharge face each other. However, when the barrier ribs are formed in a stripe form or when one of the upper and lower discharge cells divided into the barrier ribs in which the sustain electrodes are formed even though the barrier ribs are formed between the upper and lower discharge cells, the same address electrode passes and the same sustain electrode passes. The up-and-down discharge cells in contact with each other are not distinguished from each other in the general driving method during address discharge, resulting in a drop in resolution.

 In addition, in the past, phosphors are often applied onto the address electrodes in the plasma display panel. However, the phosphor has different dielectric constants because each of R.G.B (Red, Green, Blue) is made of different materials, and when the voltage is applied to the electrode for address discharge in the same structure, there is a difference in the discharge start voltage at which the discharge occurs. If the address voltage is not constant, sufficient voltage must be applied to prevent the discharge error, or the voltage application time must be sufficient. These factors reduce the discharge efficiency and increase the time required for address discharge, thereby reducing the display discharge time and expressing sufficient gradation. This cannot be achieved and there is a problem of lowering the luminance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel and a plasma display device having a structure capable of increasing light emission efficiency compared to a conventional plasma display panel.

It is also an object of the present invention to provide a plasma display panel and a plasma display device, which are capable of independently driving up and down two horizontal discharge cells facing the partition wall with sustain electrodes, which are suitable for maintaining high resolution.

In particular, it is an object of the present invention to provide a plasma display panel and a plasma display device having a structure capable of maintaining the address discharge voltage equally and stably through all cells having phosphors of different colors and suitable for high-definition screen display.

In the plasma display panel of the present invention for achieving the above object, the sustain electrode is provided to the partition wall in the opposite discharge type, the partition wall is provided so that each discharge cell is arranged in a delta form to form one pixel.

In the present invention, it is preferable that the phosphor is stacked on the inner wall of the discharge cell only in a portion except for a path connecting two electrodes related to the address discharge.

In the present invention, the partition wall is formed on the rear substrate, the phosphor is also formed on the side of the lower partition wall and the rear substrate facing the discharge cell, and the address electrode and the display electrode are formed on the front substrate and the partition wall without the phosphor, respectively It can also be done.

In the present invention, in order to increase the area of the address electrode in the discharge cell, the address electrode may further form an ITO electrode formed wide in the discharge cell and connected to the metal address electrode in addition to the linear metal address electrode. Alternatively, branches may be formed in the discharge cells in the linear address electrodes to facilitate address discharge with the sustain electrodes. At this time, the branch may be formed to protrude toward the sustain electrode related to the address discharge in the center.

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

1 and 2 illustrate a rectangular discharge cell structure of a plasma display panel having a delta partition structure according to embodiments of the present invention. FIG. 1 is a perspective view and FIG. 2 is a plan view.

FIG. 3 is a schematic cross-sectional view showing a vertical section in which the panel is to be cut along the line AA of FIG.

1 to 3, first, the panel is largely divided into a rear substrate 210 disposed below and a front substrate 110 positioned above. The lower partition wall 220 is formed on the rear substrate 210 such that the discharge cells have a delta structure. The phosphor film 230 is formed on the side surface of the lower partition wall 220 and the rear substrate 210 forming the discharge cell.

In the upper front panel 110, an address electrode is formed on the substrate surface. A buffer layer (not shown) may be stacked prior to forming the address electrode. The address electrode includes an indium tin oxide (ITO) electrode 121 and an address bus electrode 125. The ITO electrode 121 is first formed on the substrate. The ITO electrode 121 may be formed in the center of the discharge cell as a rectangle or a hexagon such as a rhombus or other cells. A metal address bus electrode 125 is provided on the substrate on which the ITO electrode 121 is formed. The bus electrode may be formed by patterning the metal film after printing or vapor deposition on the entire substrate, or may be formed by providing a bus electrode having a predetermined pattern by printing or the like from the beginning.

When the address electrode is formed to be wide, the address discharge can be easily performed. Therefore, the ITO electrode 121 can be formed to be wide to facilitate address discharge with some of the sustain electrodes. The ITO electrode 121 may also have different shapes depending on which part triggers the discharge. However, since the address discharge can be made without the ITO electrode, the ITO electrode 121 can be omitted.

On the other hand, when the line width of the address electrode is widened or the ITO electrode is formed wide in the cell, and the forming distance between adjacent address electrodes becomes too close in many sections, the two address electrodes may act as a kind of capacitor. In this case, adjacent address electrodes can affect each other's signals and increase reactive power. Therefore, while maintaining the distance between the adjacent address electrodes to a certain degree or more, branches can be formed outward from the linear metal address electrodes in necessary portions to trigger the scan sustain electrode and the address discharge.

The branch of the address electrode or the ITO pattern may be formed to be biased toward the scan sustain electrode rather than the center in view of easily triggering the address discharge.

When the address electrode including the ITO electrode 121 and the address bus electrode 125 is completed, the first dielectric layer 130 is stacked over the entire front substrate. Subsequently, the sustain electrodes 140 and 145 are provided so as to overlap a portion of the partition wall formed laterally. The sustain electrode does not need to form a separate transparent ITO electrode pattern since the opposite discharge is performed. As a method of forming the sustain electrodes 140 and 145, printing, photolithography, or the like can be used. The second dielectric layer 150 is again covered on the entire front substrate on which the storage electrodes 140 and 145 are formed, and the protective layer 160 is further stacked. As the dielectric layer or the protective layer, a conventional material may be used, and a glass component and magnesium oxide (MgO) may be used.

In this case, a portion of the front substrate on which the storage electrodes 140 and 145 are formed may be formed to be convex due to the storage electrode to form a part of the partition wall (upper partition) together with the partition wall 220 formed on the rear substrate 210. When the upper and lower substrates are aligned and sealed, if the height of the bottom wall of the lower back substrate 210 is substantially constant, the front walls 110 do not have a separate partition wall formed in the direction of the address electrode, so that the sustain electrodes 140 and 145 are separated. The partition wall and the upper front substrate 110 may be spaced between the discharge cells in the direction of. Therefore, when the partition wall is formed in the lower back substrate to fill this gap, the partition wall height of the portion parallel to the direction of the address electrode except for the intersection with the sustain electrode can be formed slightly higher. On the other hand, when forming the front substrate 110, it is also possible to form a partition wall between the discharge cells in the direction parallel to the address electrode to compensate for the height of the sustain electrode (140,145) formation.

In order to further describe the delta structure of the pixel, a description of the segmented electrode in delta color arrayed in rectangular sub-pixel (SDR) structure of Korean Patent Application No. 2001-3511 may be used. In the above application, as a method for increasing luminous efficiency, which is one problem of the plasma display panel, as shown in FIG. 2 of the present invention, three color discharge cells or subpixels constituting pixels are arranged in a triangle.

In the SDR structure in which the discharge cells are surrounded by the partition walls, the sustain electrodes 140 and 145 may be disposed to overlap the partition walls formed laterally, so there is no decrease in the aperture ratio. Since the partition wall prevents cross talk of the up and down discharge cells, the electrode can be arranged to increase the discharge area and increase the discharge efficiency. The address bus electrodes 125 are formed side by side at intervals of 1/2 the width of the discharge cells so that in some cases the partition wall and in some the discharge spaces overlap. The ITO electrode 121 is formed where the address bus electrode overlaps the discharge space. If the ITO electrode is formed wide, address discharge can easily occur.

The discharge cell arrangement of the SDR structure can be also used in the case of using a hexagonal discharge cell as shown in FIG. 4 in addition to the rectangular discharge cell. In the hexagonal honeycomb partition wall structure, the upper row and the lower row are naturally arranged alternately by 1/2 of the width of the subpixel in subpixel units, and thus may be more suitable for the SDR structure.

In the delta pixel structure of the hexagonal discharge cells, the upper and lower discharge cells adjacent to the scan sustain electrode 345 related to both the address discharge and the sustain discharge have phosphors of different colors, and do not share the address bus electrode 325. That is, in the plasma display panel having the delta pixel structure, it is possible to independently control the upper and lower discharge cells in contact with the scan sustain electrode 345.

In addition, in the delta-type pixel structure of the hexagonal discharge cells, the partition wall partitioning the discharge cells is increased as compared with the stripe-type pixel structure, so that the sidewall phosphor coating area is increased, thereby increasing the luminous efficiency.

Also in the embodiment of FIG. 4, in order to increase the area of the address electrode in the discharge cell as in the embodiment of FIG. 2, the address electrode is formed in the discharge cell in addition to the linear metal address bus electrode and is connected to the metal address electrode. 321 may be further formed.

On the other hand, when the line width of the address bus electrode 325 is widened or the ITO electrode 321 is formed wide in the cell, and the forming distance between adjacent address electrodes becomes too close in many sections, the two address electrodes can act as a kind of capacitor. . In this case, adjacent address electrodes can affect each other's signals and increase reactive power. Therefore, while maintaining the distance between adjacent address electrodes as a whole to some extent or more, branches can be formed outward from the linear metal address electrodes in necessary portions to trigger the scan sustain electrode and the address discharge.

That is, instead of removing the ITO electrode as shown in FIG. 5, the branch 331 is formed in the discharge cell in the linear address electrode 325 so that the address discharge with the scan sustain electrode 345 can be easily performed. At this time, the branch 331 is preferably formed to protrude toward the scan sustain electrode 345 associated with the address discharge in the center as shown in FIG.

2, 4, and 5, driving of discharge cells vertically adjacent to the sustaining electrode overlapping the transverse bulkhead is independent, so that a screen having a high resolution can be easily obtained without a special driving method. In addition, the light emitting efficiency can be improved by using the sustaining electrode as a counter discharge type against the partition wall.

Furthermore, the address electrodes are formed on the front substrate, not covered with phosphors, and the sustain electrodes provided on the front substrate side partitions are not covered with phosphors to discharge between the address electrodes and the scan sustain electrodes for each subpixel at the same scale. The voltage can be determined stably. Therefore, the discharge start voltage and the address discharge time are kept to the minimum necessary, and the display discharge time is increased to allow sufficient gradation expression and bright screen formation.

In particular, since a protective film is formed on the address electrode, the discharge voltage can be sufficiently increased to shorten the time required for the address discharge.

According to the present invention, the discharge gap between the sustain electrodes is increased by increasing the discharge gap, so that the discharge efficiency is improved. Since it overlaps with a partition in a partition, a fall of an aperture ratio can be prevented.

In addition, although the sustain electrode is formed on the partition wall, the delta structure in which the address electrode is not common between the upper and lower cells in contact with the sustain electrode is possible to separately control the upper and lower cells, and maintain high resolution.

In addition, in the present invention, since both the address electrode and the sustain electrode can form a protective film on the surface, the service life of the electrode is extended, the application of a high voltage is easy, the address discharge time is shortened, and the display discharge time is extended to increase the gray scale display and the overall brightness. I can bring it.

Claims (11)

Two substrates spaced at regular intervals to form a sealed space together with a surrounding sealing material, partition walls partitioning the space between the two substrates, a driving electrode for displaying an image, a discharge gas filling the space, and the substrate; A plasma display panel comprising a phosphor layer laminated on at least part of a partition wall surface, The partition wall has a delta type in which individual discharge cells are arranged in a triangle to form one pixel. And two kinds of sustain electrodes which are involved in sustain discharge among the electrodes are provided in partitions formed in the transverse direction among the partition walls so as to face each other in the discharge cells. The method of claim 1, The phosphor layer is formed on at least part of the dielectric surface of the discharge cell except for the dielectric surface portion covering the two types of electrodes in a space connecting the two types of electrodes used for address discharge among the electrodes. Plasma display panel. The method according to claim 1 or 2, The driving electrode includes an address electrode vertically installed on the front substrate among the two substrates and a sustain electrode disposed laterally on an upper side of the partition wall formed horizontally among the partition walls. And the sustain electrode includes a scan sustain electrode and a common sustain electrode which are alternately positioned. The method of claim 3, wherein The address electrode is formed to have a pitch equal to 1/2 of the width of the discharge cell, and the address electrode includes a transparent electrode pattern formed at the center of each discharge cell and a bus electrode line overlapping the transparent electrode pattern. And a plasma display panel. The method of claim 4, wherein And wherein the transparent electrode pattern is disposed to be deflected toward a scan sustain electrode that is involved in an address discharge among the sustain electrodes with respect to the center of the discharge cell. The method of claim 3, wherein The address electrode is formed to have a pitch equal to one-half the width of the discharge cell and is directed toward a scan sustain electrode in a linear electrode line toward a scan sustain electrode involved in an address discharge, or around the scan sustain electrode. And a projection to be positioned at the plasma display panel. The method according to claim 1 or 2, And the discharge cells are hexagonal or quadrangular. The method of claim 1, The driving electrode has a surface covered with a dielectric and a protective film. The method of claim 3, wherein In the partition in which the sustain electrode is provided, The lower layer part which is a part of the partition wall is integrally formed on the inner surface of the rear substrate, and the side wall surface thereof is covered with the phosphor, An upper layer part of the partition wall is formed by forming the sustain electrode pattern on an inner surface of the front substrate to include the sustain electrode, and stacking at least one dielectric layer over the sustain electrode pattern to surround the sustain electrode pattern. Plasma display panel. The method of claim 9, And a third barrier layer having a thickness corresponding to the thickness of the eugeneous electrode is further provided at a position except for the portion where the sustain electrode substrate is formed. The plasma display panel of any one of claims 1 to 10, And a circuit portion for driving a driving electrode of the panel and a frame positioned on the rear side of the panel.

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