KR100669432B1 - Plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, comprising: a front substrate and a rear substrate disposed to face each other, address electrodes formed side by side in one direction on the rear substrate, and a plurality of discharge cells disposed between the front substrate and the rear substrate. Partition walls, a phosphor layer formed in each of the discharge cells, first and second electrodes formed along a direction crossing the address electrodes on the front substrate, and corresponding to the discharge cells, and the front substrate. And a dielectric layer formed to cover the first electrode and the second electrode, wherein a first opening is formed between the first electrode and the second electrode, wherein the first electrode and the second electrode are discharge cells. Third electrodes corresponding to the second openings are formed, respectively, and are disposed in the second opening and are spaced apart from the first and second electrodes. It may include.

Plasma display panel, floating electrode, discharge efficiency

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a partially exploded perspective view illustrating a plasma display panel according to a first embodiment of the present invention.

2 is a partial plan view showing a plasma display panel according to a first embodiment of the present invention.

3 is a cross-sectional view taken along the line II of FIG. 1.

4 is a diagram illustrating an equipotential line contour before and after insertion of a third electrode in the plasma display panel according to the first embodiment of the present invention.

5 is a partial plan view of a plasma display panel according to a second embodiment of the present invention.

6 is a cross-sectional view taken along the line II-II of FIG. 5.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an electrode structure for improving panel life and discharge efficiency.

In general, a plasma display panel (PDP) is a display device that displays an image using visible light generated by a vacuum ultraviolet (VUV) emitted from a plasma obtained through gas discharge by exciting a phosphor. Such a plasma display panel can realize a large screen of 60 inches or more with a thickness of only 10 cm or less, and is a self-luminous display device such as a CRT, and thus has excellent color reproduction and no distortion due to a viewing angle. In addition, the manufacturing method is simpler than LCD, and thus has advantages in terms of productivity and cost.

The structure of the plasma display panel has been developed for a long time since the 1970s, and the structure generally known is a three-electrode surface discharge type structure. A typical three-electrode surface discharge type structure includes a front substrate on which two electrodes located on the same surface, that is, a scan electrode and a sustain electrode are formed, and a back substrate on which address electrodes which are vertically spaced apart from each other by a predetermined distance are formed. . A partition wall is formed in the space between the two substrates so that a plurality of discharge cells are partitioned, a phosphor layer is formed in the discharge cells, and a discharge gas is enclosed between the substrates. In this case, a dielectric layer and a passivation layer are sequentially formed on the front surface of the front substrate while covering the scan electrode and the sustain electrode formed on the front substrate.

In general, the presence or absence of the discharge is determined by the scan electrode connected to each line and independently controlled, and the discharge of the address electrode facing the scan electrode, and the sustain discharge indicating the brightness is the scan electrode and the sustain on the same plane. Made by an electrode.

In the conventional plasma display panel, since the sustain discharge is induced by surface discharge, the discharge efficiency is lower than that of the counter discharge in which the scan electrode and the sustain electrode are disposed opposite to each other and discharge occurs.

In addition, discharge is initiated in the region closest to the two electrodes, that is, in the discharge cell center region, and the discharge then moves to the edge region of the electrode by the space charge distribution between the two electrodes, but as time passes, Since the voltage across both electrodes decreases, strong discharge occurs in the center region of the discharge cell, and weak discharge occurs near the edge of the discharge cell. As such, since the discharge is concentrated in the discharge cell center region, the discharge efficiency is lower than that in the case where the discharge occurs in the entire electrode, and the protective layer and the phosphor layer are damaged in the vicinity of the discharge cell center region where the relatively strong discharge occurs. There is a problem that the life of the shortening.

In order to solve the above problems, an object of the present invention is to improve the discharge efficiency by inducing opposite discharge in the discharge cell center region, and at the same time the electric field is distributed throughout the scan electrode and the sustain electrode so that discharge occurs in the entire electrode. The present invention provides a plasma display panel that can improve panel life and discharge efficiency.

In order to achieve the above object, a plasma display panel according to an exemplary embodiment of the present invention includes a front substrate and a rear substrate that are disposed to face each other, address electrodes formed side by side in one direction on the rear substrate, and the rear surface of the front substrate A partition wall disposed between the substrates to partition the plurality of discharge cells, a phosphor layer formed in each of the discharge cells, and a first electrode formed along a direction crossing the address electrodes on the front substrate and corresponding to the discharge cells; And a dielectric layer formed on the front substrate and covering the first electrode and the second electrodes on the front substrate, wherein a first opening is formed between the first electrode and the second electrode. Each of the first electrode and the second electrode has a second opening corresponding to each discharge cell, and is located inside the second opening, but the first electrode and the second electrode They are spaced apart and the may include a third electrode is formed.

Preferably, each of the first and second electrodes includes a first bus electrode corresponding to each discharge cell while extending in a direction crossing the address electrode, and from each of the discharge cells from the first bus electrode. A magnification electrode extending toward the center may be formed, and the second opening may be formed in the center of the magnification electrode. In addition, the enlarged electrode may be formed of a transparent electrode.

The plasma display panel according to another embodiment of the present invention includes a part of the configuration of the plasma display panel according to the above embodiment, wherein each of the first electrode and the second electrode is elongated in a direction crossing the address electrode. And a second bus electrode corresponding to each of the discharge cells, and a third bus electrode spaced apart from the second bus electrode and extending side by side, wherein the second opening is formed between the second bus electrode and the third bus electrode. Can be formed.

In this case, the third electrode formed in the second opening may be formed separately for each discharge cell.

In addition, the second bus electrode and the third bus electrode may be formed of a metal electrode.

Meanwhile, in the above embodiments, the third electrode may be made of a transparent electrode.

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

 1 is a partially exploded perspective view showing a plasma display panel according to a first embodiment of the present invention, FIG. 2 is a partial plan view showing a plasma display panel according to a first embodiment of the present invention, and FIG. It is sectional drawing cut out in the I-I direction of.

As shown in FIG. 1, in the plasma display panel according to the present exemplary embodiment, the rear substrate 10 and the front substrate 20 are disposed to face each other at a predetermined interval, and the rear substrate 10 and the front substrate 20 are separated from each other. The space between the layers is partitioned into a plurality of discharge cells 18 by the partition wall 16. In each discharge cell 18, a phosphor layer 19 that absorbs ultraviolet light and emits visible light is formed along the partition walls and the bottom surface, and includes discharge gas (eg, Xe, Ne, etc.) to cause discharge. Mixed gas).

Address electrodes 12 are formed on one surface of the rear substrate 10 in one direction (y-axis direction of the drawing) facing the front substrate 20, and these address electrodes 12 are spaced apart from each other by a predetermined distance. Are formed side by side. In addition, the dielectric layer 14 is formed on the entire surface of the rear substrate 10 while covering the address electrodes 12.

The partition wall 16 is formed above the dielectric layer 14. In the present embodiment, the partition wall 16 includes a first partition member 16a extending in a direction parallel to the address electrode 12 (y-axis direction in the drawing), It consists of the 2nd partition member 16b formed so that it may cross | intersect this 1st partition member 16a (x-axis direction of a figure), and each discharge cell 18 will be divided into independent discharge spaces.

The barrier rib structure is not limited to the above-described structure, and the barrier rib structure having only the barrier member in parallel with the address electrode may be applied to the present invention, and the barrier rib structure having various shapes that partition the discharge cells may be used. It also belongs to the scope of the present invention.

2 and 3, the first electrode 21 is disposed on the inner surface of the front substrate 20 opposite to the rear substrate 10 along the direction crossing the address electrode 12 (the x-axis direction in the drawing). ) (Hereinafter referred to as a 'holding electrode') and a second electrode 22 (hereinafter referred to as a 'scanning electrode') are formed.

In the present exemplary embodiment, each of the sustain electrode 21 and the scan electrode 22 extends along the direction intersecting with the address electrode 12 (the x-axis direction in the drawing) and corresponds to the first discharge cell 18. Bus electrodes 21b and 22b and magnification electrodes 21a and 22a extending from the first bus electrodes 21b and 22b toward the center of each discharge cell 18. In this case, the first bus electrodes 21b and 22b may be formed near both edges of the discharge cell 18, and the enlarged electrodes 21a and 22a may face each other in the discharge cell 18. Can be formed.

Meanwhile, the enlarged electrodes 21a and 22a serve to cause plasma discharge inside each discharge cell 18, and are preferably made of a transparent electrode such as an indium tin oxide (ITO) electrode to secure an aperture ratio. The first bus electrodes 21b and 22b compensate for the high resistance of the enlarged electrodes 21a and 22a to secure current conduction, and may be made of a metal material having excellent electrical conductivity.

The scan electrode 22 receives a predetermined voltage in the address period together with the address electrode 12 to engage in address discharge, and the sustain electrode 21 together with the scan electrode 22 in the discharge sustain period. Licensed to engage in maintenance discharges. However, each electrode may have a different role depending on the signal voltage applied thereto, and thus the present invention is not limited thereto.

A dielectric layer 24 (hereinafter, referred to as a “front dielectric layer”) is formed on one surface of the front substrate 20 while covering the display electrodes 21 and 22, and the protective layer 26 while covering the front dielectric layer 24. Is formed. In addition, a first opening in the front dielectric layer 24 and the passivation layer 26 exposing the front substrate 20 in correspondence between the sustain electrode 21 and the scan electrode 22 facing each other in each discharge cell 18. A mouth 27 is formed. In FIG. 2, for the sake of clarity, the position of the first opening 27 is illustrated without showing the protective film 26.

The first opening 27 may be formed between the sustain electrode 21 and the scan electrode 22 while extending in the longitudinal direction (the x-axis direction of the drawing), or as shown in FIG. 2. It is also possible to separately form each discharge cell 18 between the sustain electrode 21 and the scan electrode 22.

Referring to FIG. 3, the sustain discharge occurring between the sustain electrode 21 and the scan electrode 22 is substantially induced by a counter discharge in the vicinity of the first opening 27 to initiate a discharge operation. The discharge is induced from the outer edge of the 27 toward the edge of the discharge cell 18 by the surface discharge. Therefore, by forming such a first opening 27, the opposite discharge can be substantially induced near the first opening 27, thereby reducing the length of the discharge path and reducing the discharge start voltage. In addition, a capacitance difference occurs at the boundary between the portion where the front dielectric layer 24 is formed and the portion of the first opening 27 where the front dielectric layer 24 is not formed, thereby causing the electric field to be severely distorted in the vicinity thereof, thereby producing a relatively strong electric field. The electric field is formed and a strong discharge can be obtained in the vicinity of the first opening 27.

The protective film 26 is formed while covering the front dielectric layer 24 to protect the front dielectric layer 24 from collision of ionized ions during plasma discharge. The passivation layer 26 may be made of MgO having a high secondary electron emission coefficient to improve discharge efficiency.

Meanwhile, referring to FIGS. 1 to 3, the sustain electrodes 21 and the scan electrodes 22 are each formed with a second opening 28 corresponding to each discharge cell 18, and the second opening 28 is formed. ), Third electrodes 21c and 22c (hereinafter referred to as 'floating electrodes') are spaced apart from the sustain electrode 21 and the scan electrodes 22.

Although the voltage is not directly applied to the floating electrodes 21c and 22c from the outside, when a voltage is applied to the first bus electrodes 21b and 22b, the floating electrodes 21c and 22c and the first bus electrodes 21b, Between 22b), a potential difference is generated by capacitive coupling. This potential difference causes the electric field to be distorted in the vicinity of the floating electrodes 21c and 22c, and discharge occurs in the entire electrode.

4 is a diagram illustrating an equipotential line contour before and after insertion of a third electrode in the plasma display panel according to the first embodiment of the present invention.

FIG. 4A shows an equipotential line contour between the sustain electrode and the scan electrode after insertion of the floating electrodes 21c and 22c and FIG. 4B shows the insertion of the sustain electrodes 21c and 22c. As shown, the equipotential line contour is deformed near the floating electrode in response to the insertion of the floating electrodes 21c and 22c as compared to before the insertion of the floating electrodes 21c and 22c (see FIG. It is also distorted near the floating electrode. Therefore, as described above, the electric field is distributed throughout the electrode, so that discharge occurs in the entire electrode, thereby reducing damage to the phosphor and the protective film due to the concentration of the discharge in the center of the discharge cell, and improving the life of the panel. have. In addition, the discharge delay can be improved due to the strong electric field effect, and the excitation and ionization of the charged particles increases as the discharge path becomes longer, thereby improving the discharge efficiency and enabling low voltage address discharge and low voltage sustain discharge.

 FIG. 5 is a partial plan view showing a plasma display panel according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line II-II of FIG. 5.

5 and 6, the present embodiment includes a part of the configuration of the plasma display panel according to the first embodiment, wherein each of the sustain electrode 31 and the scan electrode 32 is the address electrode 12. The second bus electrodes 31b and 32b corresponding to each of the discharge cells 18 and extending in parallel with the second bus electrodes 31b and 32b and extending in parallel with each other. (31a, 32a). A second opening 38 is formed between the second bus electrodes 31b and 32b and the third bus electrodes 31a and 32a, and the floating electrodes 31c and 32c are formed in the second opening 38. This is located.

 The second bus electrodes 31b and 32b may be formed near both edges of the discharge cell 18, and the third bus electrodes 31a and 32a form a constant space therebetween to form a discharge gap. While passing through the center region of the discharge cell 18, respectively.

Meanwhile, in order to apply the same voltage to the second bus electrodes 31b and 32b and the third bus electrodes 31a and 32a, the second bus electrodes 31b and 32b and the third bus electrodes 31a and 32a, respectively. 32a may be connected to each other at an end thereof (not shown), but is not limited thereto, and the second bus electrode 31b may be formed by adding a bus electrode in a direction passing over the first partition member 16a. Various modifications are possible, such as the structure connecting 32b) and the 3rd bus electrodes 31a and 32a, and this also belongs to the scope of the present invention.

In addition, the second bus electrodes 31b and 32b and the third bus electrodes 31a and 32a are preferably made of a metal electrode in order to secure electricity conduction.

5 and 6, the floating electrodes 31c and 32c are formed in the second openings 38 formed between the second bus electrodes 31b and 32b and the third bus electrodes 31a and 32a. The second bus electrodes 31b and 32b and the third bus electrodes 31a and 32a are spaced apart from each other and positioned in the second opening 38. In the present exemplary embodiment, the floating electrodes 31c and 32c are formed separately for each discharge cell 18, but are not limited thereto. The floating electrodes 31c and 32c may be formed to extend in a direction crossing the address electrode 12.

In this embodiment, economic advantages can be obtained by using a metal electrode having excellent electrical conductivity without using an expensive transparent electrode as in the first embodiment.

In the above embodiments, since the floating electrodes 21c, 22c, 31c, and 32c formed in the second openings 28 and 38 are positioned on the front substrate 20, the floating electrodes 21c, 22c, 31c, and 32c are formed of transparent electrodes to secure the aperture ratio. desirable.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the plasma display panel according to the present invention, by forming an opening near the center area of the discharge cell, the opposite discharge can be substantially induced to reduce the length of the discharge path and to reduce the discharge start voltage, the sustain electrode and the scan. By inserting the floating electrodes in each electrode, the electric field is distributed throughout the electrodes, so that the discharge occurs in the entire electrode, thereby reducing the damage of the phosphor and the protective film due to the concentration of the discharge in the center of the discharge cell and improving the life of the panel. Can be. In addition, the discharge delay can be improved due to the strong electric field effect, and as the discharge path becomes longer, the excitation and ionization of the charged particles increase, so that the discharge efficiency is improved, and the low voltage address discharge and the low voltage sustain discharge are possible.

Claims (7)

A front substrate and a back substrate disposed to face each other; Address electrodes formed side by side in one direction on the rear substrate; Barrier ribs disposed between the front substrate and the rear substrate to partition a plurality of discharge cells; Phosphor layers formed in the discharge cells; First and second electrodes formed on the front substrate in a direction crossing the address electrodes and corresponding to the discharge cells; And And a dielectric layer formed on the front substrate to cover the first electrode and the second electrodes, wherein a first opening is formed between the first electrode and the second electrode. Each of the first and second electrodes may have a second opening corresponding to each of the discharge cells, and may be disposed in the second opening and spaced apart from the first and second electrodes. Include, Each of the first and second electrodes extends along a direction crossing the address electrode and extends in parallel with a second bus electrode corresponding to each discharge cell and spaced apart from the second bus electrode. And a bus electrode, wherein the second opening is formed between the second bus electrode and the third bus electrode. delete delete delete  The method of claim 1,  And the second bus electrode and the third bus electrode are formed of a metal electrode. The method of claim 1, And a third electrode formed in the second opening is formed separately for each discharge cell. The method according to any one of claims 1, 5 and 6, And the third electrode comprises a transparent electrode.

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