KR100647638B1 - Plasma display panel - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a plasma display panel having a structure in which damage due to ion sputtering does not occur or at least decreases in a phosphor layer on a partition wall due to discharge during sustain discharge. An upper substrate and a lower substrate spaced apart to face each other; A partition wall disposed between the upper substrate and the lower substrate to partition a discharge cell together with the upper substrate and the lower substrate; An upper dielectric layer formed below the upper substrate; A lower dielectric layer formed on the lower substrate; A phosphor layer disposed in the discharge cell; A discharge gas filled in the discharge cell; The base electrode is embedded in the upper dielectric layer, and includes a base electrode disposed in one direction along an end of the discharge cell, and a protruding electrode that extends from the base electrode toward the center of the discharge cell, and is spaced apart from each other. A plurality of sustain electrode pairs each having a pair of X electrodes and Y electrodes disposed to face each other; And address electrodes embedded in the lower dielectric layer, each of the discharge cells extending in a direction crossing the protruding electrodes, wherein the sidewalls of the horizontal partition wall formed in the same direction as the extension direction of the sustain electrode pair of the partition walls A plasma display panel is inclined at an angle of 85 ° to 90 ° from the upper substrate.

Description

Plasma display panel {Plasma display panel}

1 is a cross-sectional view showing a unit discharge cell of a conventional plasma display panel,

FIG. 2 is a partial plan view from above showing a state in which the storage electrode pairs of FIG. 1 are disposed;

3 is a partially separated perspective view illustrating a plasma display panel according to an embodiment of the present invention;

FIG. 4 is a partial plan view illustrating a state in which sustain electrode pairs and address electrodes are arranged in FIG. 3;

5 is a cross-sectional view taken along the line VV of FIG. 3,

6 is an enlarged cross-sectional view of part A of FIG. 5.

<Brief description of the major symbols in the drawings>

111.Top substrate 112.Top dielectric layer

121..holding electrode pair 122..X electrode

123,126..protruding electrode 124,127..base electrode

125 Y electrode 131 lower substrate

132. Address electrode 133. Lower dielectric layer

134. Bulkhead 135. Phosphor layer

C. phosphor layer g. Gap

α .. Angle between the side of the bulkhead and the upper substrate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure to improve discharge efficiency and to prevent damage to a phosphor layer.

In general, a plasma display panel applies a predetermined voltage to an electrode in a state where gas is charged between electrodes installed in an enclosed space so that a glow discharge occurs, and the plasma display panel is formed by ultraviolet rays generated during the glow discharge. The phosphor layer formed in the pattern is excited to form an image.

The plasma display panel is classified into a DC type, an AC type, or a hybrid type according to a driving method. And, depending on the electrode structure, it is divided into having at least two electrodes required for discharge and having three electrodes. In the case of the DC type, an auxiliary electrode is added to induce an auxiliary discharge. In the case of an AC type, an address electrode is introduced to separate the address discharge and the sustain discharge to improve the address speed. In addition, the AC type may be classified into a counter electrode structure and a surface discharge electrode structure according to the arrangement of the electrodes for discharging. In the case of the counter electrode structure, two sustain electrodes forming a discharge are respectively formed on the substrates. The surface discharge type electrode structure is a structure in which the discharge is formed on one plane of the substrate by placing two sustain electrodes forming the discharge on the same substrate.

1 illustrates a cross-sectional structure of a unit discharge cell provided in a conventional plasma display panel.

Referring to the drawings, in the discharge cell 10, the lower surface of the upper substrate 11 is formed with a sustain electrode pair 12 consisting of an X electrode 13 and a Y electrode 14 spaced apart from each other by a discharge gap therebetween. have. The X electrode 13 and the Y electrode 14 serve as the common electrode and the scan electrode, respectively. The X electrode 13 and the Y electrode 14 are provided with the transparent electrodes 13a and 14a and the bus electrodes 13b and 14b respectively formed on the lower surfaces thereof to apply a voltage. The sustain electrode pair 12 is embedded by an upper dielectric layer 15, and a protective layer 16 is formed on a lower surface of the upper dielectric layer 15.

The lower substrate 21 is disposed to face the upper substrate 11, and the address electrode 22 is formed on the lower substrate 21. The address electrode 22 is embedded by the lower dielectric layer 23.

A partition 33 is disposed in a space between the upper substrate 11 and the lower substrate 21, which partitions the discharge cell 10 together with the upper substrate 11 and the lower substrate 21. And prevents crosstalk between discharge cells. The phosphor layer 24 is formed of a fluorescent material on the side surface of the partition 33 and the lower dielectric layer 23. On the other hand, the discharge gas is injected into the discharge cell 10 configured as described above.

The operation of the plasma display panel with the discharge cells 10 having the above structure will be briefly described as follows.

First, when an address discharge voltage is applied between the address electrode 22 and the Y electrode 14, an address discharge occurs. Thus, a predetermined wall charge is formed in the addressed discharge cell 10. In this state, when the sustain discharge voltage is applied between the X electrode 13 and the Y electrode 14, the sustain discharge occurs. The charges generated by such a discharge collide with the discharge gas, and thus plasma is formed to generate ultraviolet rays. The phosphor layer 24 is excited by the generation of such ultraviolet rays, thereby displaying an image.

As shown in FIG. 2, the sustain discharge is made between the X electrodes 13 having a predetermined gap g and the transparent electrodes 13a and 14a of the Y electrode 14, wherein the start of the sustain discharge is performed. Is made in this gap g.

In order for the discharge started in the gap g to be effectively diffused through the cell, the start of the discharge must occur over a wide area. By the way, when the gap g is formed at regular intervals as shown in FIG. 2, there is a problem that the start of discharge occurs locally and the diffusion of the discharge is not smoothly performed. The reason is that when a voltage is applied to the X electrode 13 and the Y electrode 14, which are electrodes which cause sustain discharge, to generate a discharge, a uniform field is formed over the entire surface of the transparent electrodes 13a and 13b. This is because the unnecessary portion of the portion of the transparent electrode which contributes little to discharge is increased. This part not only reduces the discharge efficiency in the discharge cell but also covers a substantial part of the discharge cell, thereby reducing the luminance.

In addition, in the case of having a gap g as shown in FIG. 2, there is a problem in that discharge concentration occurs in a specific portion, so that diffusion of discharge in the discharge cell is not smooth.

In addition, in the plasma display panel having such a structure, the sustain electrode pairs 12 are disposed in the discharge cell 10 instead of directly above the partition 33, which is not good for the aperture ratio of the panel.

The present invention is to solve the above problems, it is possible to drive a low voltage even if the area of the address electrode is reduced and to improve the discharge efficiency, the damage caused by ion sputtering in the phosphor layer on the partition due to the discharge during the sustain discharge The present invention provides a plasma display panel which does not do or at least has a decreasing structure.

Plasma display panel according to the present invention for achieving the above object is:
An upper substrate and a lower substrate spaced apart from each other to face each other;
A partition wall disposed between the upper substrate and the lower substrate to partition a discharge cell together with the upper substrate and the lower substrate;
An upper dielectric layer formed below the upper substrate;
A lower dielectric layer formed on the lower substrate;
A phosphor layer disposed in the discharge cell;
A discharge gas filled in the discharge cell;
The base electrode is embedded in the upper dielectric layer, and includes a base electrode disposed in one direction along an end of the discharge cell, and a protruding electrode that extends from the base electrode toward the center of the discharge cell, and is spaced apart from each other. A plurality of sustain electrode pairs each having a pair of X electrodes and Y electrodes disposed to face each other; And
Embedded in the lower dielectric layer, each of the discharge cells includes address electrodes extending in a direction crossing the protruding electrodes;

The sidewalls of the horizontal barrier ribs formed in the same direction as the extension direction of the sustain electrode pair among the barrier ribs may be inclined by 85 ° to 90 ° from the upper substrate.

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In this case, the base electrode is preferably disposed above the partition wall.

Here, the protruding electrode is a transparent electrode made of ITO, the base electrode is preferably a bus electrode to compensate the electrode line resistance of the transparent electrode.

Meanwhile, it is preferable that a non-discharge area is provided between discharge cells arranged along the direction in which the address electrode extends.

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

FIG. 3 is an exploded perspective view of the plasma display panel according to an exemplary embodiment of the present invention, and FIG. 4 is a plan view showing a state in which sustain electrode pairs and address electrodes are arranged in FIG. 3. .

3 and 4, in the plasma display panel 100 according to the present invention, an upper substrate 111 on which an image is displayed and a lower substrate 131 disposed opposite to the upper substrate 111 are provided. . The upper substrate 111 and the lower substrate 131 form one discharge cell C together with the partition wall 134.

A plurality of sustain electrode pairs 121 are arranged on the surface of the upper substrate 111 facing the lower substrate 131. The sustain electrode pair 121 may include an X electrode 122 and a Y electrode 125, and the X electrode 122 and the Y electrode 125 may serve as a common electrode and a scan electrode, respectively.

The X electrode 122 and the Y electrode 125 are provided with the protruding electrodes 123 and 126 and the base electrodes 124 and 127, respectively. The base electrodes 124 and 127 are disposed in one direction along the ends of the discharge cells C, and the protruding electrodes 123 and 126 have a width toward the center of the discharge cells C from the base electrodes 124 and 127. It grows and protrudes. The X electrode 122 and the Y electrode 125 are disposed to face each other with a gap g for each discharge cell C to form one storage electrode pair 122.

In this case, it is preferable that the protruding electrodes 123 and 126 are transparent electrodes, and the base electrodes 124 and 127 are bus electrodes. That is, since the protruding electrodes 123 and 126 are disposed under the front substrate through which visible light passes, the protruding electrodes 123 and 126 are formed of indium tin oxide (ITO), which is a transparent conductor to transmit visible light, and the base electrodes 124 and 127 are transparent. A voltage is applied to each of the electrodes, and in order to improve the electrical resistance of the transparent electrodes formed of ITO having relatively low electrical conductivity, it is preferable to be formed of a metal having excellent conductivity such as silver (Ag) or copper (Cu). Do. The X electrode 122 and the Y electrode 125 will be described in more detail later.

An upper dielectric layer 112 is formed on the upper substrate 111 so as to cover and cover the pair of sustain electrodes 121.

The upper dielectric layer 112 conducts charge while directly discharging between adjacent X and Y electrodes 122 and 125 and prevents cations or electrons from directly colliding with the sustain electrode pair 121 to damage the electrodes. It is formed of a dielectric that can induce wall charges by induction. Such dielectrics include PbO, B 2 O 3, SiO 2, and the like.

The upper dielectric layer 112 is preferably covered with a protective layer 113 such as MgO. The protective layer 113 prevents cations and electrons from colliding with the upper dielectric layer 112 during the discharge and damaging the upper dielectric layer 112. In addition, the protective layer 113 emits a large amount of secondary electrons during discharge, thereby smoothly plasma discharge. The protective layer 113 performing this function is formed using a material having a high secondary electron emission coefficient and a high visible light transmittance.

In the lower substrate 131 facing the upper substrate 111, address electrodes 132 are disposed on a surface of the lower substrate 131 facing the upper substrate 111. The address electrode 132 is formed in a direction crossing the base electrodes 124 and 127 of the sustain electrode pair 121.

The address electrodes 132 are covered by a lower dielectric layer 133 and buried therein, and a partition wall 134 is formed between the address electrodes 132 at an upper portion of the lower dielectric layer 133 to form a plurality of discharge cells ( C) into compartments. The partition wall 134 prevents cross talk with an adjacent discharge cell C.

A phosphor layer 135 is formed on an inner side surface of the barrier rib 134 and an upper surface of the lower dielectric layer 133 surrounded by the barrier rib 134 and in which the barrier rib is not formed. The color of the phosphor of the phosphor layer 135 is roughly divided into red, green, and blue to implement a color, and forms a phosphor layer 135 of red, green, and blue according to the color of the phosphor.

The phosphor layer 135 has a component for generating visible light by receiving ultraviolet rays. The red light emitting phosphor layer formed in the red discharge cell includes a phosphor such as Y (V, P) O4: Eu, and the like. The formed red light emitting phosphor layer includes a phosphor such as Zn 2 SiO 4: Mn, and the blue light emitting phosphor layer formed in the blue discharge cell includes a phosphor such as BAM: Eu.

Meanwhile, the discharge cells C partitioned by the partition wall 134 may be formed in various forms, for example, a stripe type, a matrix type, a delta type, and the like, according to the structure of the partition wall 134. According to the discharge cell (C) is made of an octagon.

In this case, the discharge cells C are arranged continuously in an octagonal shape, and the non-discharge regions NC are disposed around the discharge cells C. FIG. The non-discharge area NC corresponds to a region where no discharge occurs because no separate voltage is applied, and is provided between the discharge cells C arranged along the direction in which the address electrode 132 is formed. Heat generated by the electrodes in the discharge cell flows into the non-discharge area NC, thereby increasing the heat radiating effect of the entire plasma display panel.

And, as shown in FIG. 4 for each of the discharge cells C prepared as described above, the X electrode 122 and the Y electrode 125 forming the sustain electrode pair 121 are discharge cells from both edges of the discharge cell C. Each lead is inserted into (C) and spaced at predetermined intervals, and an address electrode 132 is disposed to intersect the X electrode 122 and the Y electrode 125.

In addition, the discharge cells C are filled with a discharge gas in which neon (Ne), xenon (Xe), etc. are mixed, and in the state where the discharge gas is filled as described above, the upper and lower substrates 111 and 131 of the discharge cells C are filled. The upper substrate 111 and the lower substrate 131 are sealed and bonded to each other by a sealing member such as frit glass formed at the edge thereof.

Meanwhile, the X electrode 122 and the Y electrode 125 have a structure in which discharge stability is secured while maximizing emission luminance and discharge efficiency, corresponding to the aforementioned barrier rib structure 134.

As shown, the X electrode 122 includes protruding electrodes 123 spaced apart from each other and disposed for each discharge cell C, and a base electrode 124 connected to one side of the protruding electrodes 123. Likewise, the Y electrode 125 is similarly disposed on each side of the protruding electrodes 126 and the protruding electrodes 126 of the X electrodes 122 and the protruding electrodes 126. The connected base electrode 127 is provided.

Base electrodes 124 and 127 are connected to one end of the protruding electrodes 123 and 126, and the other ends of the protruding electrodes 123 and 126 protrude into the discharge cells C. Since the end portions of the protruding electrodes 123 and 126 to which the base electrodes 124 and 127 are connected have a small contribution to discharge, the base electrodes (from the side center of the protruding electrodes 123 and 126) are increased in order to increase the aperture ratio. It may be desirable that the widths are gradually narrowed to the ends where the 124 and 127 are connected.

Meanwhile, in the drawing, the protruding electrodes 123 and 126 are curved in a gap portion, but the present invention is not limited thereto, and each of the protruding portions constituting the long gap and the protrusion forming the short gap are provided at end portions of the gap. In this case, in the discharge mechanism in which the sustain discharge starts from the short gap and spreads out into the long gap, and spreads throughout the discharge cell C, the long gap inlets concentrate the discharge in the center. The stable discharge is made, and the projections forming the short gap can lower the discharge start voltage.

The operation of the plasma display panel having such a structure is as follows. When a predetermined voltage is applied to the address electrode 132 and the Y electrode 125, a discharge cell for emitting light is selected, and an address discharge occurs between the two electrodes 125 and 132 to generate wall charges on the upper dielectric layer 112. Is charged. Then, when a predetermined voltage is alternately applied between the X electrode 122 and the Y electrode 125, the wall charge is moved between the two electrodes 122 and 125, causing the discharge gas to cause a sustain discharge, As a result, the discharge gas generates ultraviolet rays, and the generated ultraviolet rays excite the phosphor layer 135 to form an image.

The discharge does not occur until the discharge start voltage is reached, but once the discharge is generated and the number of discharges is repeated, it is exponentially generated and diffuses around. Therefore, according to the plasma display panel 100 according to the present invention, the discharge amount is increased at the initial stage of sustain discharge due to the large width of the protruding electrodes 123 and 126 in the gap g portion of one discharge cell C. This makes it possible to lower the discharge start voltage. In addition, as the width of the protruding electrodes 123 and 126 decreases toward the end of the discharge cell C, the aperture ratio can be increased.

In addition, the discharge cells C have an octagonal shape, and thus, the protruding electrodes 123 and 126 also have a rhombic shape, so that the discharge region in the discharge cells is more uniform than a conventional plasma display panel having a matrix partition wall. Therefore, maintenance discharge can occur evenly. This in turn results in an increase in luminous efficiency.

The base electrodes 124 and 127 may be disposed above the non-discharge area NC, that is, the partition wall 134 in order to increase the opening ratio of the panel 100. Therefore, unlike the phosphor layer of the conventional three-electrode surface discharge type plasma display panel, the phosphor layer 135 of the present invention is positioned under the protruding electrodes 123 and 126.

On the other hand, in the conventional three-electrode surface discharge type plasma display panel, the width of the transparent electrode is the same at both the gap g side end and the bottom electrode end, but the plasma display panel 100 of the present invention has the protruding electrode 123. , 126 decreases toward the base electrodes 124 and 127 from the gap g. In this structure, continuous discharge causes the discharge near the base electrodes 124 and 127 to be increasingly counted. In addition, when the discharge time near the base electrode becomes longer, ion sputtering becomes stronger and the damage of the fluorescent material in the vicinity becomes more severe.

The damage of the fluorescent material by ion sputtering becomes more severe as the distance between the protruding electrode and the fluorescent material near the base electrode where the discharge occurs is closer.

However, as shown in FIGS. 5 and 6, since the base electrodes 124 and 127 are disposed above the barrier rib 134, the protruding electrodes toward the base electrodes 124 and 127 are disposed on the barrier rib 134. The protrusion electrodes 123 and 126 are disposed close to the phosphor layer 135. Therefore, as shown in FIG. 6, if the partition wall 134 formed near the base electrodes 124 and 127 has some degree of inclination, the phosphor layer 135 applied to the side surface of the partition wall 134 also has a constant slope. Will have In this case, the phosphor layer 135 is also located at a close distance to the protruding electrode 126, so that the phosphor layer 135 is severely damaged by ion sputtering.

Therefore, it is preferable to avoid the application of the phosphor layer 135 in the vicinity of the protruding electrodes 123 and 126 having strong ion sputtering. Accordingly, in the present invention, the side surface of the partition wall 134 is 85-90 ° with the upper substrate 111. It is formed to have an angle (α). Accordingly, the degree of damage to the phosphor layer 135 coated on the sidewalls of the barrier rib 134 due to ion sputtering may be reduced.

In order to minimize damage caused by the phosphor layer 135 by ion sputtering, the sidewall of the barrier rib 134 is more preferably formed vertically from the upper substrate 111.

As described above, according to the present invention, the partition wall and the sustain electrode pairs are arranged so that the discharge cell is enlarged to the center, thereby increasing the effective discharge space to improve the discharge efficiency, and at the same time, the upper side of the substrate on which the phosphor layer is applied. It is possible to prevent the phosphor layer from being damaged by ion sputtering, or at least to reduce it, even when sustain discharge is maintained by maintaining it substantially perpendicular to the reference.

Although the present invention has been described with reference to one embodiment shown in the accompanying 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. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

Claims (8)

An upper substrate and a lower substrate spaced apart from each other to face each other; A partition wall disposed between the upper substrate and the lower substrate to partition a discharge cell together with the upper substrate and the lower substrate; An upper dielectric layer formed below the upper substrate; A lower dielectric layer formed on the lower substrate; A phosphor layer disposed in the discharge cell; A discharge gas filled in the discharge cell; The base electrode is embedded in the upper dielectric layer, and includes a base electrode disposed in one direction along an end of the discharge cell, and a protruding electrode that extends from the base electrode toward the center of the discharge cell, and is spaced apart from each other. A plurality of sustain electrode pairs each having a pair of X electrodes and Y electrodes disposed to face each other; And Embedded in the lower dielectric layer, each of the discharge cells includes address electrodes extending in a direction crossing the protruding electrodes; And a side surface of the horizontal partition wall formed in the same direction as the extension direction of the sustain electrode pair among the partition walls is inclined from 85 ° to 90 ° from the upper substrate. The method of claim 1, And the base electrode is disposed above the partition wall. The method of claim 2, And a side surface of the partition wall is formed vertically from the upper substrate. The method according to claim 1 or 2, Wherein the protruding electrode is a transparent electrode made of ITO, and the base electrode is a bus electrode which compensates the electrode line resistance of the transparent electrode. The method of claim 1, And the discharge cells partitioned by the barrier ribs each having an octagonal structure. The method of claim 5, And a non-discharge area between each of the discharge cells arranged along the direction in which the address electrode extends. The method of claim 6, And the base electrode is disposed in the non-discharge area. The method of claim 1, And a protective layer formed on a lower surface of the upper dielectric layer.

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