KR100741088B1 - Plasma display panel - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel having an electrode protruding toward a discharge cell so that the discharge generation area is increased. In order to achieve this object, the present invention provides a first substrate and a second substrate disposed to face each other. A substrate, a partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells together with the first substrate and the second substrate, and positioned on the first substrate or the second substrate toward the discharge cell. Provided is a plasma display panel including a plurality of electrodes formed by protruding protrusions and extension portions extending in one direction.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view schematically showing the structure of a conventional plasma display panel.

FIG. 2 is a view of the dotted line in FIG. 1 as viewed from below. FIG.

3 is an exploded perspective view schematically illustrating a structure of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 4 is a view of the dotted line in FIG. 3 as viewed from below. FIG.

5 is a view showing another modified example of the electrode of the plasma display panel according to the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

111: first substrate 112: second substrate

120: bulkhead 135, 136: sustain electrode

140: first dielectric layer 160: address electrode

170: second dielectric layer 180: phosphor layer

190: discharge cell

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel including an electrode formed to protrude into a discharge cell.

The plasma display device refers to a flat panel display device that realizes an image by using a gas discharge phenomenon. The plasma display device has not only excellent characteristics of a large screen, high definition, ultra-thin, light weight, and wide viewing angle, but also a simpler and larger manufacturing method than other flat panel display devices. Its ease of use has attracted much attention as a large flat panel display device.

The plasma display apparatus includes a plasma display panel (PDP) for displaying an image such as an image by emitting phosphors by ultraviolet rays generated during gas discharge. The plasma display panel is classified into a direct current type, an alternating current type, and a hybrid type according to an applied discharge voltage, and an opposed discharge type and a surface discharge type according to a discharge structure. surface discharge type).

The counter discharge type has a problem of shortening the lifetime due to phosphor deterioration due to the ions emitted during discharge, while the surface discharge type overcomes the problem of the counter structure by minimizing the deterioration of the phosphor by collecting discharge to the opposite side of the phosphor. It is used as PDP structure of.

1 is an exploded perspective view of a portion of a plasma display panel for showing a panel structure of a three-electrode surface discharge type PDP.

Referring to the drawings, the partition wall 20 is disposed between the front substrate 11 and the rear substrate 12 to partition the plurality of discharge cells 90. A plurality of sustain electrodes 30 are printed on the bottom surface of the front substrate 11, and the sustain electrodes 30 form electrode pairs of the X electrodes 35 and the Y electrodes 36. Each of the X electrode 35 and the Y electrode 36 is a bus of transparent electrodes 31 and 32 such as indium-tin oxide (hereinafter referred to as ITO) and a conductive metal attached to one side of the transparent electrode. It consists of the electrodes 33 and 34. The sustain electrode 30 is covered with the dielectric layer 40. A protective film 50 made of a material such as magnesium oxide (MgO) is formed on the bottom surface of the dielectric layer 40.

On the other hand, a plurality of address electrodes 60 are printed on the upper surface of the back substrate 12 extending in a direction orthogonal to the sustain electrode 30 while crossing each discharge cell 90. The dielectric layer 70 is formed on the upper surface of the address electrode 60.

In addition, a phosphor 80 is coated on the inner surface of the partition wall 20 and the upper surface of the lower plate dielectric layer. The discharge cell 90 is filled with an inert gas such as Xe, Ar, or the like.

When discharge occurs at the sustain electrode, electrons collide with the gas to cause ionization, excitation, and radiation, and the ultraviolet rays generated at this time hit the phosphor 80 to produce visible light.

2 is a view for showing the shape of the electrode portion causing the discharge and the discharge occurs, it is seen in the direction of the arrow from below the portion represented by the dashed line in FIG. In other words, the sustain electrode pair passing through the top surface 90a of the discharge cell is viewed from below.

As shown in FIG. 2, in the conventional surface discharge structure, discharge occurs between the lower surfaces of the ITO electrodes as indicated by the dotted arrows. Therefore, since only one side of the discharge occurs toward the discharge cell, the discharge efficiency is low. In addition, even if the transparent electrode is applied, since the visible light passes through the front side, the brightness is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above and other problems, and an object of the present invention is to provide a plasma display panel having an electrode protruding toward a discharge cell so that the discharge generation area is increased.

According to the present invention, a first substrate and a second substrate are disposed to face each other, a partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells together with the first substrate and the second substrate, and the first substrate. An extension portion extending along the first substrate or the second substrate and positioned on the substrate or the second substrate and protruding from the extension portion and toward the inside of the discharge cell from the first substrate to the second substrate; A plasma display panel including a plurality of sustain electrodes having an extended protrusion is provided.

Here, the sustain electrodes may be paired with each other to correspond to each of the discharge cells as one electrode pair.

Here, a dielectric may be disposed between the protrusions of each of the storage electrodes constituting the electrode pair.

Here, a protective layer may be deposited on the outside of the dielectric.

Here, the protrusion may be formed to be disposed in the center of the discharge cell.

Here, the protrusion may be formed such that the other surface is in contact with the inner wall of the discharge cell so that discharge occurs only on one surface.

The sustain electrode may be disposed to correspond to the partition wall so that the extension portion does not cover the discharge cell.

The sustain electrode may be formed of indium-tin oxide.

Here, the sustain electrode may be formed of copper or silver.

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

3 is an exploded perspective view illustrating a structure of a plasma display panel according to an exemplary embodiment of the present invention. Referring to the drawings, a plasma display panel according to an exemplary embodiment of the present invention may include a first substrate 111, a second substrate 112, a partition wall 120, sustain electrodes 135 and 136, a first dielectric 140, The address electrode 160, the second dielectric 170, and the phosphor 180 are provided.

The first substrate 111 and the second substrate 112 are disposed to face each other at regular intervals. Here, the first substrate 111 and the second substrate 112 may be formed of a glass substrate having excellent visible light transmittance, and may be colored to improve bright room contrast. In addition, the first substrate 111 and the second substrate 112 may be formed of a plastic and have a flexible structure.

A plurality of discharge cells 190 are formed between the first substrate 111 and the second substrate 112 by partitioning a space between the first substrate 111 and the second substrate 112 to form the discharge cells 190. A plurality of barrier ribs 120 are provided to prevent electrical and optical crosstalk between them. In the discharge cell 190, phosphors 180 of red (R), green (G), and blue (B) are coated on the inner wall of the partition wall 120 and the inner side of the second substrate.

On the rear surface of the first substrate 111, a plurality of sustain electrodes 135 and 136 are formed to pass through each discharge cell 190. The sustain electrodes are arranged in pairs so as to correspond to the discharge cells 190 two by one. One of them is referred to as the first sustain electrode 135 and the other as the second sustain electrode 136. In the embodiment of the present invention, the first sustain electrode 135 and the second sustain electrode 136 cause a sustain discharge due to a difference in voltage applied to each other. The first sustain electrode 135 is also used for addressing for forming wall charges.

The sustain electrodes 135 and 136 are formed of an extension extending in one direction and a protrusion protruding toward the discharge cell 190 to generate a discharge. In one sustaining electrode 135 and 136, each protrusion is disposed at the center of the discharge cell 190. The reason for this will be described later with reference to FIG. 4. Unlike the conventional plasma display panel, the protrusion is disposed such that a wide surface where discharge occurs is parallel to the partition wall 120. Therefore, even if it is not necessarily formed of transparent ITO, the amount of blocking the light exiting from the discharge cell 190 is small. In the embodiment of the present invention, the sustain electrodes 135 and 136 may include copper (Cu) and silver (Ag) having excellent conductivity. Of course, ITO may be used as in the conventional plasma display panel. When ITO is used, conductivity can be improved by attaching a metal bus electrode at its side. On the other hand, the extension portions of the sustain electrodes 135 and 136 are disposed to correspond to the partition wall 120 so as not to cover the discharge cells 190. This is to increase the aperture ratio by preventing the extension from covering the discharge cells.

The first dielectric 140 is disposed between each surface of the protrusion of the sustain electrodes 135 and 136 and between the first sustain electrode 135 and the second sustain electrode 136. When voltage is applied to the sustain electrodes 135 and 136, wall charges are accumulated on the dielectric, which is used for the memory function. The first dielectric 140 preferably includes lead oxide (PbO). Although not shown, a protective film made of a material such as magnesium oxide (MgO) may be deposited on the first dielectric to protect the dielectric.

A plurality of address electrodes 160 are disposed on the upper surface of the second substrate 112 to pass through each discharge cell 190. As illustrated, the address electrode 160 forms an angle of 90 degrees with the sustain electrodes 135 and 136. The address electrode 160 is used for reset discharge and addressing discharge. A second dielectric 170 is disposed on the address electrode 160 to protect the address electrode 160. In addition, the second dielectric 160 is formed of a material having a high light reflectance to prevent light from leaking toward the rear surface.

FIG. 4 illustrates sustain electrodes 135 and 136 when a portion corresponding to the upper surface of one discharge cell 190 is viewed from below. That is, when the portion 190a indicated by the double-dotted line in FIG. 3 is viewed from below, the structure of the sustaining electrode part corresponding to the discharge cell is shown as a part of the sustaining electrodes 135 and 136. Referring to the drawings, the protrusion protrudes in a rectangular shape toward the discharge cell and is formed to be orthogonal to the first substrate. Therefore, a discharge occurs when voltage is applied between both surfaces 135a and 135b of the protrusion of the first sustain electrode 135 and both surfaces 136a and 136b of the protrusion of the second sustain electrode 136. Arrows shown by dotted lines in FIG. 4 indicate discharge paths. According to the embodiment of the present invention, due to the double-sided discharge as described above, the discharge area is doubled than in the case of the conventional plasma display panel. Further, since the protrusion is orthogonal to the first substrate, the aperture ratio can be sufficiently secured.

5 is a view showing a modification in which the position of the protrusion in the sustain electrode used in the embodiment of the present invention is changed. The rectangle 290a shown by the dashed line defines one discharge cell, and a part of the first sustaining electrode 235 and the second sustaining electrode 236 is shown. In the modification, the protrusion is formed to be disposed at the edge of the discharge cell, not the center thereof. In this case, discharge occurs only between one surface 235a of the first storage electrode and one surface 236a of the second storage electrode, and the other surface 236b of the first storage electrode and the other surface 236b of the second storage electrode are partitioned. It is blocked and there is no discharge. However, in the opening ratio, the protrusion is located at the edge of the discharge cell, which is advantageous over the above-described embodiment.

According to the plasma display panel according to the present invention, the electrode is formed to protrude toward the discharge cell, so that the discharge area can be widened and the aperture ratio can be increased.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (9)

A first substrate and a second substrate disposed to face each other; A partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells together with the first substrate and the second substrate; And An extension portion extending along the first substrate or the second substrate and positioned on the first substrate or the second substrate and protruding from the extension portion and facing the inside of the discharge cell; 2. A plasma display panel comprising a plurality of sustain electrodes having protrusions extending toward a substrate. The method of claim 1, And two sustain electrodes corresponding to each of the discharge cells forming an electrode pair. The method of claim 2, And a dielectric disposed between protrusions of each of the sustain electrodes constituting the electrode pair. The method of claim 3, And a protective layer deposited outside the dielectric. The method according to claim 1 or 2, And the protrusion is formed at the center of the discharge cell. The method according to claim 1 or 2, And the protruding portion is formed such that the other surface is in contact with the inner wall of the discharge cell so that discharge is generated only at one surface. The method of claim 1, And the sustain electrode is disposed to correspond to the barrier rib so that the extension portion does not cover the discharge cell. The method according to claim 1 or 2, And the sustain electrode is formed of indium-tin oxide. The method according to claim 1 or 2, And the sustain electrode is formed of copper or silver.

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