KR100592318B1 - Plasma display panel and flat panel display device having same - Google Patents

Abstract

The present invention is to increase the aperture ratio and the luminous efficiency of the plasma display panel, and to further increase the discharge efficiency. To this end, the front substrate, the rear substrate disposed in parallel with the front substrate, the front substrate and A partition wall disposed between the rear substrate and defining the discharge cells together with the front substrate and the rear substrate; a plurality of X electrodes disposed in the partition wall to surround at least a portion of the discharge cells; A plurality of Y electrodes disposed in the partition wall so as to surround a portion opposed to the part surrounded by the X electrode, a protective layer disposed on a surface of the partition wall and including at least a carbon compound, and disposed in the discharge cells A plasma display panel including the phosphor layers and a discharge gas in the discharge cells, and a flat panel display having the same Provide value.

Description

Plasma display panel and flat display device comprising the same

1 is a cross-sectional view of a unit pixel of a plasma display panel according to an exemplary embodiment of the present invention;

2 is a plan view for showing the structure of the X electrode and the Y electrode,

3 is a cross-sectional view of a unit pixel of a plasma display panel according to another exemplary embodiment of the present invention;

4 illustrates an example of a driving waveform of the plasma display panel of the present invention.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 101: front substrate

102 back substrate 103 dielectric layer

104: rear bulkhead 105: fluorescent layer

106: front partition 107: X electrode

108: Y electrode 109: protective layer

The present invention relates to a plasma display panel and a flat panel display device having the same, and more particularly, to a plasma display panel having a high aperture ratio and good discharge efficiency and a flat panel display device having the same.

Recently, a device employing a plasma display panel as a flat panel display device has a large screen and has excellent characteristics of high definition, ultra-thin, light weight, and wide viewing angle, and is easier to manufacture than other flat panel display devices. It is attracting attention as a large flat panel display device.

The plasma display panel is classified into a direct current (DC) type, an alternating current (AC) type, and a hybrid type according to an applied discharge voltage, and classified into a counter discharge type and a surface discharge type according to a discharge structure.

In the DC plasma display panel, all electrodes are exposed to a discharge space, and charges are directly transferred between the corresponding electrodes. In the AC plasma display panel, at least one electrode is surrounded by a dielectric layer, and discharge is performed by an electric field of wall charge instead of direct charge transfer between the corresponding electrodes.

In the DC plasma display panel, since the charge is directly transferred between the corresponding electrodes, there is a problem that the electrode is severely damaged. In recent years, the AC plasma display panel has been generally adopted.

In the case of such an AC plasma display panel, an address electrode, an X electrode, and a Y electrode are positioned to surround a discharge space defined by a front substrate, a rear substrate, and a partition wall. At the time of discharge, addressing discharge occurs first between the address electrode and the X electrode or the Y electrode, and then sustain discharge occurs between the X electrode and the Y electrode.

However, in the conventional plasma display panel, since ultraviolet rays generated through discharge and visible rays generated through phosphor excitation by the ultraviolet rays are transmitted through the front substrate to implement an image, there is a limit in increasing efficiency. This is because the transmittance of the front substrate is less than 60%.

On the other hand, in the case of the conventional plasma display panel, the MgO film is used as a protective layer, but the carbon-based material having an electron emission characteristic superior to this MgO has a low light transmittance and thus cannot be employed. That is, since a protective layer is necessarily required to be a transparent protective layer, many restrictions apply to the material which can be used.

The present invention is to solve the various problems of the conventional plasma display panel, including the above-mentioned problems, the high aperture ratio, the luminous efficiency can be increased, and further, the plasma display panel and the same can further increase the discharge efficiency It is an object to provide a flat panel display.

In order to achieve the above and other objects, the present invention is a front substrate; A rear substrate disposed in parallel with the front substrate; A partition wall disposed between the front substrate and the rear substrate and defining discharge cells together with the front substrate and the rear substrate; A plurality of X electrodes disposed in the partition wall to surround at least a portion of each discharge cell; A plurality of Y electrodes disposed in the partition wall so as to surround a portion of each discharge cell that is opposed to the portion surrounded by the X electrode; A protective layer disposed on a surface of the partition and including at least a carbon compound; Phosphor layers disposed in the discharge cells; And a discharge gas in the discharge cells.

The present invention provides a flat panel display device having such a plasma display panel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. These embodiments and drawings are intended to aid the understanding of the present invention, and the scope of the present invention is not limited to the following embodiments or the accompanying drawings, and will be obviously defined by the appended claims.

1 is a cross-sectional view of a unit pixel of the plasma display panel 100 according to an exemplary embodiment of the present invention, and FIG. 2 is a plan view illustrating the structures of the X electrodes and the Y electrodes.

1 and 2, the plasma display panel 100 according to an embodiment of the present invention includes a front substrate 101 and a back substrate 102.

The back substrate 102 and the front substrate 101 are spaced apart at predetermined intervals to define a plurality of discharge cells C partitioned by the rear partition 104 and the front partition 106 therebetween. The transparent front substrate 101 is made of a material having good light transmittance, such as glass, and the back substrate 102 is generally made of glass.

A dielectric layer 103 is formed on the front surface of the back substrate 102. The dielectric layer 103 is formed as a dielectric that can induce charge during discharge. Such dielectrics include PbO, B ₂ O ₃ , and SiO _2. Etc.

The rear partition 104 is formed on the dielectric layer 103, and may be provided in a matrix form as shown in the front partition 106 shown in FIG. 2. However, the rear bulkhead 104 is not necessarily limited thereto, and as long as it can form a plurality of discharge spaces, as well as open bulkheads such as stripes, for example, stripes, etc., as well as closed waffles, matrices, deltas, etc. It can be a bulkhead. In addition, the closed partition wall may be formed such that the cross section of the discharge space becomes a polygon such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the quadrangle as in the present embodiment.

The front bulkhead 106 is formed on the rear surface of the front substrate 101. Referring to FIG. 2, the front bulkhead 106 has a matrix shape having a quadrangular cross section of the discharge space. However, the shape of the front bulkhead is not limited thereto, and as long as a plurality of discharge spaces can be formed, the front bulkhead may have various patterns, such as waffles and deltas. In addition, the cross section of the discharge space may be formed to be a polygon, such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the quadrangle. In addition, in the present embodiment, the front partition 106 and the rear partition 104 is formed to have the same shape, but may be formed to have a different shape.

The front bulkhead 106 and the rear bulkhead 104 may be integrated, where the integral is not limited to being formed in the same process, and it means that the front bulkhead and the rear bulkhead are not damaged and are difficult to separate. In the present embodiment, the front partition 106 is formed on the front substrate 101, the rear partition 104 is shown as formed on the back substrate 102, the present invention is not limited to the above structure. That is, the front substrate 101 or the rear substrate 102 may be provided with a front partition wall and a rear partition wall.

The X electrodes 107 and the Y electrodes 108 are disposed in the front partition wall 106 facing each other with the discharge cell C interposed therebetween. The X electrodes 107 and the Y electrodes 108 are arranged in parallel at a predetermined interval, which are spaced apart from each other by a predetermined interval as shown in FIG. 1, and as shown in FIG. have. That is, the distances from the front substrate 101 to the X electrode 107 and the Y electrode 108 are arranged to be different.

In the present embodiment, the X electrodes 107 are the main X electrodes 107a disposed to cross the inside of the front partition 106 in one direction, and the auxiliary X electrodes protruding from the main X electrodes 107a in different directions. 107b. By the main X electrode 107a and the auxiliary X electrode 107b, the X electrode 107 surrounds two side surfaces of each discharge cell C. As shown in FIG.

Similarly for the Y electrodes 108, the main Y electrode 108a disposed to cross the inside of the front partition 106 in one direction, and the auxiliary Y electrode protruding from the main Y electrode 108a in another direction 108b. Therefore, by the main Y electrode 108a and the auxiliary Y electrode 108b, the Y electrode 108 surrounds the remaining two sides not surrounded by the X electrode 107 in each discharge cell C. do.

 The front partition wall 106 is directly energized between the X electrodes 107 and the Y electrodes 108, and charged particles, electrons, etc. directly collide with the sustain electrodes, and thus the X electrodes 107 and the Y electrodes. It is desirable to form a dielectric material capable of inducing charge and accumulating wall charges while preventing damage to 108.

The protective layer 109 is preferably formed on the side surface of the front partition wall 106. The protective layer 109 prevents damage to the front partition 106 formed of the dielectric, the X electrodes 107 and the Y electrodes 108 by the sputtering of plasma particles, and emits secondary electrons to discharge the discharge voltage. It acts to lower.

According to an exemplary embodiment of the present invention, the protective layer 109 may include a carbon compound having a significantly high secondary electron emission coefficient, and carbon nanotubes may be used as the carbon compound.

Although such a carbon compound has high electron emission characteristics, it is difficult to be employed in a structure in which electrodes are formed on a conventional front substrate because of its low light transmittance.

However, in the case of the structure in which the discharge electrode is arrange | positioned in a partition like the present invention, even if it uses the carbon compound with low light transmittance as a protective layer 109, it will not become a problem at all.

The protective layer 109 is not limited to using the carbon compound alone, and may be formed of a film in which a conventional magnesium oxide (MgO) is mixed with the carbon compound.

In addition, as shown in FIG. 3, the protective layer 109 is divided into a first protective layer 109a containing a carbon compound and a second protective layer 109b containing magnesium oxide, and the X electrode The first protective layer 109a may be positioned at a position opposite to at least one of the 107 and the Y electrode 108, and the second protective layer 109b may be positioned at other portions. In this case, the discharge characteristics can be further improved by the first protective layer 109a containing the carbon compound, and the front partition 106 is removed from the plasma particles by the second protective layer 109b containing magnesium oxide. This will increase protection and price competitiveness.

On the other hand, each of the discharge cells (C) is coated with phosphor layers 105, in more detail, red, green, blue, and / or white light emitting phosphor layers. The phosphor layer 105 is applied on the side of the rear partition 104 and the dielectric layer 103 opposite the discharge cells C, but the position where the phosphor layers 150 are disposed is not limited thereto, and the discharge cell ( Can be placed in various locations within C).

In the discharge cells C, Ne, Xe, or a mixed discharge gas thereof is injected. In the case of the plasma display panel 100 according to the present invention, after manufacturing the front substrate 101 and the back substrate 102 separately, they are sealed and aligned with each other by a sealing member such as frit glass. To combine.

In the plasma display panel 100 configured as described above, the X electrode 107 serves as an address, and as a sustain discharge electrode during sustain discharge, and the Y electrode 108 serves as a scan and sustain discharge. It acts as a sustain discharge electrode.

In the plasma display panel 100 having such a configuration, when the X electrode 107 and the Y electrode 108 cause opposite discharge, the path of ions can be seen on the surface of the phosphor layer 105 as shown in FIG. It can be formed substantially horizontally, thus causing less damage to the phosphor layer 105.

Next, an example of driving the plasma display panel of the present invention as described above will be described.

3 shows an example of a driving waveform of the plasma display panel of the present invention.

First, in the reset period PR, a reset pulse consisting of a rising ramp pulse and a falling ramp pulse is applied to each of the lines Y1, ... Yn of the Y electrode 108. The rising ramp pulse rises from the positive first voltage Vs by the second voltage Vset to reach the third voltage Vset + Vs, and the falling ramp pulse falls from the first voltage Vs to be negative. The fourth voltage Vnf of polarity is reached. The ground voltage Vg is applied to the lines X1, ..., Xm of the X electrode 107 during the reset period PR. When the rising ramp pulse is applied, negative wall charges accumulate near the Y electrode 108 in the discharge cell, and positive wall charges accumulate near the X electrode 107 to generate a weak discharge. When the down ramp pulse is applied, the negative wall charges accumulated near the Y electrode 108 and the positive wall charges accumulated near the X electrode 107 are erased, resulting in a small amount of negative polarity near the Y electrode 108. The wall charges accumulate a small amount of positive wall charges in the vicinity of the X electrode 107.

In the address period PA, scan pulses having the fifth voltage Vschc while maintaining the fifth voltage Vsch are sequentially applied to the lines Y1,..., And Yn of the Y electrode. In order to select a discharge cell to be turned on, a display data signal having a seventh positive voltage Va corresponding to the scan pulse is applied to the lines X1, ..., Xm of the X electrodes. When the scan pulse and the display data signal start to be applied, negative wall charges accumulate near the Y electrode 108 and positive wall charges accumulate near the X electrode 107 to start discharge, and address discharge is performed. After that, positive wall charges are accumulated near the Y electrode 108 and negative wall charges are accumulated near the X electrode 107.

In the sustain period PS, a sustain pulse having an alternating positive first voltage Vs and a negative first voltage -Vs is applied to the lines Y1, ..., Yn of the Y electrode, The ground voltage Vg is applied to the sustain electrode lines X1..., Xm.

First, when the first positive voltage Vs is applied, the positive wall charge near the Y electrode 108, the negative wall charge near the X electrode 107, and the first applied to the Y electrode 108 are applied. The sustain discharge is started by one voltage Vs and the ground voltage Vg applied to the X electrode 107. The sustain discharge causes the negative wall voltage and X to be in the vicinity of the Y electrode 108 in the discharge cell. A positive wall voltage is accumulated near the electrode 107.

Next, when the negative first voltage (-Vs) is applied, the negative wall charges near the Y electrode 108, the negative wall charges near the X electrode 107, and the Y electrode 108 are applied. Sustain discharge is initiated by the first negative voltage (-Vs) applied to the negative electrode) and the ground voltage (Vg) applied to the X electrode 107, and the Y electrode 108 is discharged in the discharge cell by the sustain discharge. The wall voltage of positive polarity in the vicinity and the wall voltage of negative polarity are accumulated in the vicinity of the X electrode 107.

These drive waveforms are just one example, and can be driven by various waveforms.

The plasma display panel according to the present invention has the following effects.

First, since the electrode is not formed on the surface of the front substrate, the aperture ratio can be increased.

Second, as the aperture ratio increases, luminous efficiency may increase.

Third, since a separate address electrode is not formed on the back substrate, the process can be simplified.

Fourth, when the X electrode and the Y electrode cause the opposite discharge, the path of the ions is formed substantially horizontally on the surface of the phosphor layer, so that damage to the phosphor layer can be made less.

Fifth, a carbon compound can be used as a protective layer, which can further increase discharge characteristics.

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 (11)

Front substrate; A rear substrate disposed in parallel with the front substrate; A partition wall disposed between the front substrate and the rear substrate and defining discharge cells together with the front substrate and the rear substrate; A plurality of X electrodes disposed in the partition wall to surround at least a portion of each discharge cell; A plurality of Y electrodes disposed in the partition wall so as to surround a portion of each discharge cell that is opposed to the portion surrounded by the X electrode; A protective layer disposed on a surface of the partition and including at least a carbon compound; Phosphor layers disposed in the discharge cells; And And a discharge gas in the discharge cells. The method of claim 1, The partition wall includes a front partition wall extending from the front substrate, and a rear partition wall extending from the rear substrate, And the X electrodes and the Y electrodes are included in the front partition wall. The method of claim 2, And the protective layer is provided to cover the surface of the front partition wall. The method of claim 1, The partition wall has a plasma display panel, characterized in that having a matrix shape for partitioning a plurality of discharge cells having a rectangular cross section. The method of claim 1, And a dielectric layer disposed between the phosphor layer and the back substrate. The method of claim 1, And the X electrodes and the Y electrodes spaced apart from each other by a predetermined distance and arranged in parallel to cross each other. The method of claim 6, And the X electrodes and the Y electrodes include main electrodes that are spaced apart from each other by a predetermined distance and intersect with each other, and auxiliary electrodes extending from the main electrodes. The method of claim 1, The carbon compound is a plasma display panel comprising carbon nanotubes. The method of claim 1, The protective layer further comprises a magnesium oxide plasma display panel. The method of claim 1, The protective layer is provided with a first protective layer containing the carbon compound and a second protective layer containing magnesium oxide, And the first protective layer is disposed at a position opposite to at least one of the X electrode and the Y electrode. A flat panel display device comprising the plasma display panel of any one of claims 1 to 10.

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