KR100684844B1 - Plasma display panel - Google Patents

Abstract

Plasma display panel of the present invention is formed in the space between the front substrate and the rear substrate, the front substrate and the rear substrate which are disposed opposite to each other partition walls for partitioning a plurality of discharge cells, is formed long in one direction across the discharge cells An address electrode, a scan electrode formed between the first sustain electrode and the second sustain electrode extending in a direction crossing the address electrode, the scan electrode formed between the first and second sustain electrodes, the first and second sustain electrodes, and the scan. The content ratio of the dielectric layer filling the electrode and the xenon (Xe) gas is 10 (%) to 15 (%), and comprises a discharge gas filling the discharge cell.

Discharge gas, xenon, plasma, content ratio

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a partially exploded perspective view showing a schematic configuration of a plasma display panel constructed in accordance with an embodiment of the present invention.

FIG. 2 is an electrode layout diagram illustrating a positional relationship between partition walls and electrodes in the plasma display panel illustrated in FIG. 1.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved content ratio of discharge gas.

In general, a plasma display panel (hereinafter, referred to as 'PDP') is a thin film display device that generates an image by exciting a phosphor with ultraviolet rays caused by gas discharge occurring in a discharge cell.

This PDP has dozens or millions of discharge cells arranged in a matrix form according to its size, and according to the type of driving voltage waveform applied and the structure of the discharge cell, the DC type and the AC type Type).

In the DC-type PDP, since the electrode is exposed to the discharge space as it is, the current flows in the discharge space while voltage is applied, and there is a disadvantage in that a resistance for current limitation must be made for this purpose. On the other hand, in the AC type PDP, since the electrode covers the dielectric, the current is limited by the formation of a natural capacitance component, and thus, the electrode is protected from the impact of ions during discharge.

AC-type PDP having this advantage forms a discharge cell between a pair of substrates facing each other, and a pair of discharge electrodes corresponding to the discharge cell is formed of a front substrate, which is covered by a dielectric. The substrate has a structure in which an address electrode is formed to cross the discharge electrode.

A well-known driving method of the PDP configured as described above is an ADS driving method for driving a subfield separately into an address section and a sustain section.

In this ADS drive, the address period is a period during which the wall charges are accumulated in the discharge cells (addressed cells) which are turned on by selecting the discharge cells that are turned on and the discharge cells that are not turned on in the PDP. This is a period in which a sustain discharge voltage is alternately applied to the electrodes to perform discharge for actually displaying an image in the addressed discharge cells.

Therefore, when the PDP has a weak discharge in the address section and the wall charges accumulate in the discharge cell, when the voltage corresponding to the difference between the wall voltage and the discharge start voltage due to the wall charge is applied as the sustain discharge voltage, the PDP is selected in the address section. Discharge occurs only for the discharge cells. At this time, the discharge gas charged in each discharge cell causes surface discharge in the dielectric layer to generate plasma, and the phosphor emits light by ultraviolet rays generated at this time to display an image.

In the conventional three-electrode surface discharge structure PDP having such a configuration and driving, since the addressing is performed by using either the address electrode or the discharge electrode, the electrode that acts on the addressing does not accumulate wall charge uniformly in the discharge cell. There is a problem that is biased.

On the other hand, as is well known, image display in a PDP is performed by discharge gas emitting phosphors. For this reason, attempts have been made to increase the content ratio of Xe in the composition of the discharge gas as one method of improving the emission luminance of the PDP. The composition of the discharge gas in the PDP is generally used to use a phenning gas mixture of a small amount of Xe gas in the base gas consisting of Ne, He or a mixture thereof. The generation of vacuum ultraviolet light that excites the phosphor is caused by a small amount of Xe gas, which is mostly discharged from Xe ⁺ ions and excited Xe because the Xe gas has lower ionization energy than the metastable state energy of the base gas Ne or He. ^{* It} is filled with gas and is involved in the light emission of the phosphor.

However, in the plasma induced by the discharge gas in the discharge cell, the electron temperature rapidly decreases due to collisions with heavy neutral gas atoms such as Xe, and even if the average energy Te of the electron is slightly reduced, it may participate in the excitation and ionization. Since the number of possible electrons drops sharply to exp (−ε / kTe), when the content ratio of Xe in the discharge gas is increased, the discharge voltage also increases.

The present invention has been made to solve the above problems, to improve the electrode structure, to provide a plasma display panel of the present invention having a content ratio of the discharge gas suitable for this electrode structure.

In order to achieve the above object, the plasma display panel provided by the present invention,

A barrier rib formed in a space between the front substrate and the rear substrate disposed opposite to each other, partitioning a plurality of discharge cells, extending in one direction to cross the discharge cells, and the address electrode; A first sustain electrode and a second sustain electrode formed to extend in an intersecting direction, a scan electrode formed between the first and second sustain electrodes, a dielectric layer and a xenon filling the first and second sustain electrodes and the scan electrode The content ratio of (Xe) gas is 10 (%) to 15 (%), and comprises a discharge gas filling the discharge cell.

At this time, the pressure applied to the inside of the panel has a range of 400 (torr) to 500 (torr), the short gap is formed at an interval between 60 (㎛)-100 (㎛), the long gap is 220 (㎛) Preferably at intervals between 300 (μm).

In the present invention, a short gap is formed between each of the first sustain electrode and the second sustain electrode and the scan electrode, and a long gap is formed between the first sustain electrode and the second sustain electrode, which is larger than the short gap.

In the present invention, the first and second sustain electrodes are each formed of a combination of a bus electrode extending in a direction crossing the address electrode and a transparent electrode protruding from the bus electrode toward the scan electrode. .

In this case, the barrier rib includes a horizontal barrier rib formed to extend in a direction crossing the address electrode, and a vertical barrier rib formed to intersect the horizontal barrier rib, and the bus electrode is formed on the horizontal barrier rib.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a partially exploded perspective view showing a plasma display panel according to an embodiment of the present invention. Referring to this, a plasma display panel (hereinafter referred to as PDP) constructed according to an embodiment of the present invention will be described.

As shown in the figure, the PDP of the present embodiment is arranged with the rear substrate 10 and the front substrate 20 facing each other at a predetermined interval, and are formed by the partition 16 in the space between the two substrates 10 and 20. Color discharge cells 18 (18R, 18G, 18B) are provided. In the discharge cell 18, a phosphor layer 19 which is excited by ultraviolet rays and emits visible light is formed along the wall surface and the bottom surface of the partition wall, and the discharge gas is filled to cause plasma discharge.

The front substrate 20 is formed of a transparent material such as glass through which visible light can be transmitted so that an image is displayed. On the lower surface of the front substrate 20, a pair of sustain electrodes 21a and 21b and a scan electrode 23 are formed to correspond to each discharge cell 18 along one direction (x-axis direction in the drawing). Among them, the scan electrode 23 selects a discharge cell that is turned on by working with the address electrode 12, and the pair of sustain electrodes 21a and 21b cause sustain discharge for the selected discharge cell. The sustain electrodes 21a and 21b and the scan electrode 23 will be described in detail later.

The sustain electrode and the scan electrode are covered by a dielectric layer 28 formed of a dielectric such as PbO, B ₂ O ₃ , SiO _2, and the like, and the dielectric layer 28 is filled with charged particles during discharge. It prevents damage to the display electrodes 25 by directly colliding with and serves to induce charged particles.

The dielectric layer 28 may be covered by a protective film 29 formed of MgO or the like, which protects the charged dielectric particles 28 from damaging the dielectric layer 28 by directly colliding with the dielectric layer 28 during discharge. When the charged particles collide with each other, the secondary electrons may be released to increase discharge efficiency.

The back substrate 10 facing the front substrate 20 extends in the direction in which the address electrodes 12 intersect the scan electrodes 23 (y-axis direction in the drawing), and are spaced apart from each other. It is arranged in the form corresponding to a discharge cell. The address electrodes 12 are covered with a dielectric layer 14 and embedded therein, and the partition wall 16 is formed in a predetermined pattern on the dielectric layer 14.

The partition wall 16 divides the discharge cells 18, which are discharge spaces in which discharge is performed, to prevent cross talk between adjacent discharge cells 18. As shown, the partition wall 16 is spaced apart from each other in a direction intersecting the vertical partition wall 16a on the same plane as the vertical partition wall 16a and the vertical partition wall 16a extending apart from each other. The horizontal partition wall 16b is extended to define the discharge cells 18 having a closed structure.

In the present embodiment, such a partition structure is described as a preferable form, and the structure of the discharge cell may be modified in various forms depending on the relationship with the electrodes to be installed.

In the discharge cells 18, phosphor layers 19 that emit visible light by being excited by ultraviolet rays generated during discharge are formed. This phosphor layer 19 is formed over the wall surface of the partition 16 and the dielectric layer 14 defined by the partition 16 as shown. The phosphor layer 19 may be formed by selecting any one of red, green, and blue phosphors for color expression, and thus divided into red, green, and blue phosphor layers 18R, 18G, and 18B. Can be.

As described above, the discharge cells 18 in which the phosphor layer 19 is disposed are filled with a discharge gas in which neon (Ne), xenon (Xe), and the like are mixed.

Meanwhile, Graph 1 below is a graph showing the results of measuring the efficiency while varying the content ratio of Xe in the discharge gas. In this experiment, 42-inch SD class PDP was constructed as described above. In addition, the internal pressure of the PDP was tested in the case of 450 torr and 500 torr, respectively.

[Graph 1]

As a result, in the case where the internal pressure was 450 torr, the most ideal result was obtained when the content ratio of xenon gas was 10% and 12%. In other words, while the sustain voltage is about 220 (V) to 240 (V), a stable voltage margin can be obtained and the voltage value is not too high. The efficiency (luminance ratio per power consumption) is also 3 (lm / W). I can see that it appears as high.

In addition, even when the internal pressure was 500 Torr, the most ideal result was obtained in terms of voltage and efficiency in the case where the content ratio of xenon gas was 10% and 12%. On the other hand, in the case of having a content ratio of 7% is very preferable in terms of voltage, in this case it is not preferable because the efficiency is not good.

Therefore, in view of these experimental results, the PDP of the present embodiment constructed as described above uses a discharge gas having an internal pressure of 400 tortor (500 torr) and a xenon content ratio of 10 to 15%. You can see that it is the most ideal.

Hereinafter, the discharge cell structure of the PDP according to the present embodiment will be described in detail with reference to FIGS. 2 and 3. 2 is a schematic plan view showing an arrangement relationship between a partition, a sustain electrode, and a scan electrode.

In the present embodiment, the partition wall 16 includes a horizontal partition wall 16b extending in one direction (x-axis direction in the drawing) and a vertical partition wall 16a formed in a direction crossing the partition wall 16b. Accordingly, the discharge cells 18 are partitioned into a lattice shape.

A pair of sustain electrodes 21 and scan electrodes 23 are formed along the discharge cells 18 in the direction intersecting with the address electrodes 12 (x-axis direction in the figure). At this time, the scan electrode 23 is positioned between the pair of sustain electrodes 21a and 21b.

More specifically, in this embodiment, the sustaining electrode 21 is composed of a pair of first and second sustaining electrodes 21a and 21b, each of which is adjacent to the transverse bulkhead 16b of the horizontal bulkhead 16b. It extends along the extension direction. Therefore, a pair of sustain electrodes 21a and 21b are provided in the shape of partitioning one row of discharge cells from above and below.

Preferably, the pair of sustain electrodes 21a and 21b are formed of a combination of the bus electrode 211 and the transparent electrode 213.

The bus electrode 211 is made of a non-transmissive material of metal (eg, chromium, copper, etc.) and is positioned above the horizontal partition wall 16b to extend in the extending direction of the horizontal partition wall 16b (y-axis direction in the drawing). Formation.

The transparent electrode 213 is made of a transparent conductive material such as ITO, and protrudes toward the inside of the discharge cell 18 in a state where a part of the end thereof is in contact with the bus electrode 211.

Since the bus electrode 211 is formed above the horizontal partition wall 16b, the opening ratio of the discharge cell can be increased without covering the upper surface of the discharge cell, and the transparent electrode 213 is located above the discharge cell. Therefore, sufficient wall charges can be collected.

Meanwhile, although the transparent electrodes 213 positioned up and down (in the y-axis direction of the drawing) with the horizontal bulkhead 16b therebetween are shown as sharing the bus electrode 211, the bus Of course, it can be composed only of the electrode (211).

On the other hand, the scan electrode 23 is formed between the pair of sustain electrodes 21a and 21b which protrude from the top and bottom of the discharge cell 18 to the center of the discharge cell.

The scan electrode 23 extends in one direction (x-axis direction in the drawing), that is, in a direction crossing the address electrode while crossing the center of the discharge cell 18. As a result, the adjacent sustain electrodes 21a and 21b are kept at a constant distance from each other. The scan electrode 23 may also be formed by the combination of the bus electrode 231 and the transparent electrode 233 in the same manner as the sustain electrode 21 described above, and may be formed by the bus electrode 231 alone. It may be.

As such, as the scan electrode 23 is formed to intersect the address electrode 12 in the center of the discharge cell, the addressing driving occurs in the center of the discharge cell so that the wall charges are uniformly distributed with respect to the center of the discharge cell. Therefore, it is possible to reduce the non-discharge region where no discharge occurs in the discharge cell.

On the other hand, since the scan electrode 23 is at the center and a pair of sustain electrodes 21a and 21b are positioned on both sides of the scan electrode 23, the double gap of the long gap G2 and the short gap G1 in this embodiment is doubled. It has a discharge gap structure.

That is, a short gap G1 is formed between each of the sustain electrodes 21a and 21b and the scan electrode 23, and a long gap G2 is formed between the pair of sustain electrodes 21a and 21b. Thus, since the discharge gap constituting the discharge is formed in a double structure, the discharge easily occurs around the short gap G1 at the initial stage of the discharge, and thereafter, the discharge is diffused into the long gap, thereby strongly forming the plasma to increase the emission luminance. In this case, the short gap G1 is preferably formed at an interval of 60 μm to 100 μm and the long gap G2 is formed at an interval of 220 μm to 300 μm.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to the present invention, the above-mentioned problem can be solved and the non-discharge area according to the electrode position of the discharge cell can be eliminated, whereby the light emission luminance of the discharge cell can be improved than before. Furthermore, since the content ratio of the xenon gas in the discharge gas can be selected appropriately for the electrode structure, stable discharge and light emission luminance can be obtained, and voltage margin at this time can also be secured.

Claims (7)

A front substrate and a back substrate disposed to face each other; Barrier ribs formed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells; An address electrode formed to extend in one direction to cross the discharge cell; A first sustain electrode and a second sustain electrode formed to extend in a direction crossing the address electrode; A scan electrode formed between the first and second sustain electrodes; A dielectric layer filling the first and second sustain electrodes and the scan electrode; And, A discharge gas filling the discharge cell with a content ratio of xenon (Xe) gas of 10 (%) to 15 (%); Including, In the initial stage of discharge, discharge starts at each short gap between the scan electrode and the first sustain electrode, and between the scan electrode and the second sustain electrode, Thereafter, a discharge is formed between the first sustain electrode and the second sustain electrode with a long gap longer than the short gap. The method of claim 1, And a pressure applied to the inside of the panel is in a range of 400 (torr) to 500 (torr). delete The method of claim 1, Wherein the short gap is formed at an interval between 60 μm and 100 μm, and the long gap is formed at an interval between 220 μm and 300 μm. The method of claim 1, And a bus electrode, wherein the first and second sustain electrodes extend in a direction crossing the address electrode, respectively, and a transparent electrode protruding from the bus electrode toward the scan electrode. The method of claim 5, A horizontal barrier rib formed to extend in the direction intersecting the address electrode, and a vertical barrier rib formed to intersect the horizontal barrier rib, And the bus electrode is formed on the horizontal partition wall. delete

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