KR100684717B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel having a structure capable of realizing high efficiency. According to an embodiment of the present invention, a plasma display panel includes a first substrate and a second substrate disposed to face each other, address electrodes formed in one direction from the first substrate, and a space between the first substrate and the second substrate. Barrier ribs partitioning the discharge cells, a phosphor layer formed in the discharge cells, display electrodes formed along the direction crossing the address electrodes on the second substrate, and arranged such that at least one pair of the discharge cells faces each other; A dielectric layer covering each of the display electrodes and having an opening formed in the second substrate and exposing a portion of the second substrate between at least one pair of display electrodes corresponding to each of the discharge cells; And an island type electrode disposed at an end of the pair of display electrodes disposed toward the center of the cell.

Dielectric layer, phosphor layer, protrusion electrode, island type electrode

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

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

3 is a partial cross-sectional view taken along the line II of FIG. 1 to show a discharge start position and a main discharge position in the plasma display panel according to an exemplary embodiment of the present invention.

4A through 4D are partial plan views illustrating a plasma display panel according to another exemplary embodiment of the present invention corresponding to part A of FIG. 2.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel for improving luminous efficiency while lowering a discharge start voltage.

Plasma display panels (hereinafter referred to as "PDPs") include three-electrode surface discharge type PDPs. The three-electrode surface discharge type PDP consists of a substrate including sustain electrodes and scan electrodes located on the same surface, and another substrate including address electrodes extending in a vertical direction spaced apart from the substrate by a predetermined distance therebetween, and discharging a discharge gas therebetween. Doing. In this PDP, the presence or absence of discharge is determined by the discharge of the scan electrode and the address electrode independently connected to each line, and the sustain discharge displaying the screen is made by the sustain electrode and the scan electrode located on the same plane.

PDP uses glow discharge to generate visible light, and after the glow discharge occurs, several steps are taken before visible light reaches the human eye. That is, when a glow discharge occurs, an excited gas is generated by the collision of electrons and gases, and ultraviolet rays are generated from the excited gas, and visible light is generated because the ultraviolet rays collide with the phosphor in the discharge cell. It passes through the transparent substrate and reaches the human eye. Through this step, input power applied to the sustain electrode and the scan electrode is considerably lost.

This glow discharge is caused by applying a voltage higher than the discharge start voltage between the two electrodes. In other words, a very high voltage is required for this discharge to start. Once discharge occurs, the voltage distribution between the cathode and the anode is distorted due to the space charge effect generated in the dielectric layers around the cathode and the anode. That is, between the two electrodes, a cathode sheath region around the cathode that consumes most of the voltage applied to the two electrodes for discharge, and an anode sheath region around the anode that consumes a portion of the voltage, And a positive column region formed between the two regions and consuming little voltage. The electron heating efficiency in the cathode sheath region depends on the secondary electron coefficient of the MgO protective film formed on the surface of the dielectric layer, and most of the input energy in the positive column region is consumed by electron heating. It is known.

The vacuum ultraviolet rays that collide with the phosphor and emit visible light are generated when the Xen gas in the excitation state is transitioned to the ground state, and the excited state of Xen is Xe gas. Is created by the collision between and electrons. Therefore, in order to increase the ratio of generating the visible light among the input energy (that is, the luminous efficiency), the electron heating efficiency must be increased to increase the collision of electrons with the xenon (Xe) gas.

In the cathode sheath region, most of the input energy is consumed, but the electron heating efficiency is low. In the positive column region, the electron heating efficiency is very high while the input energy consumption is low. Therefore, high luminous efficiency is possible because it increases the positive column region (discharge gap).

In addition, the ratio of electrons consumed among all electrons according to the change of the ratio E / n of the electric field E and the gas density n between the discharge gaps (positive column region) is equal to (E / In n), the electron consumption ratio is known to increase in the order of xenon excitation (Xe *), xenon ion (Xe ⁺ ), neon excitation (Ne *), and neon ion (Ne ⁺ ). Further, at the same ratio (E / n), it is known that the electron energy decreases as the xenon (Xe) partial pressure increases. That is, when this electron energy decreases, the partial pressure of xenon (Xe) increases, and when the partial pressure of xenon (Xe) increases, the above-mentioned xenon excitation (Xe *), xenon ions (Xe ⁺ ), neon excitation (Ne *) ), The ratio of electrons consumed to excitation of xenon (Xe) is increased among the electrons consumed in neon ions (Ne ⁺ ), thereby improving the luminous efficiency.

As mentioned above, the increase in the positive column area increases the electron heating efficiency. Increasing the partial pressure of xenon (Xe) increases the rate of electron heating consumed for xenon excitation (Xe *) in electrons. Therefore, both of them increase electron heating efficiency, thereby improving luminous efficiency.

However, an increase in the positive column area or an increase in the Xen partial pressure all have problems of increasing the gas breakdown voltage and increasing the manufacturing cost of the PDP.

Therefore, in order to increase the luminous efficiency, it is required to implement an increase in the positive column area and an increase in the xenon partial pressure under a low discharge start voltage.

As is known, when the distance and pressure of the discharge gap are the same, the discharge start voltage required for the counter discharge structure is lower than the discharge start voltage required for the surface discharge structure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and provides a plasma display panel which is configured such that the discharge between the scan electrode and the sustain electrode appears as a counter discharge, thereby increasing the luminous efficiency while lowering the discharge start voltage.

In order to achieve the above object, a plasma display panel according to an embodiment of the present invention includes a first substrate and a second substrate disposed to face each other, address electrodes formed in one direction from the first substrate, and the first substrate. Barrier ribs partitioning the discharge cells in a space between the substrate and the second substrate, a phosphor layer formed in the discharge cells, and formed along a direction crossing the address electrodes on the second substrate, and at least one pair in each discharge cell faces each other. Display electrodes arranged to be visible, covering the display electrodes, and being formed in the second substrate, and openings exposing a portion of the second substrate between at least one pair of display electrodes corresponding to the respective discharge cells. A dielectric layer having a dielectric layer and an island type electrode disposed at an end of the pair of display electrodes disposed toward the center of each discharge cell. It is configured to.

The display electrode includes a pair of bus electrodes extending in a direction crossing the address electrode, and a pair of expansion electrodes extending from the bus electrode toward the center of each discharge cell and facing each other. Is a transparent electrode, and has a first portion extending from the bus electrode in a direction crossing the bus electrode, and a branched second portion branching from the first portion, wherein the second portion is between at least one pair of branches. It may be configured to have a concave portion formed to face each other at the central portion of each discharge cell in the may be a quadrangle extending in the direction crossing the bus electrode.

In this case, an opening of the dielectric layer is formed between the second portions of the facing enlarged electrodes, and the island type electrode is disposed at an end portion of the second portions of the enlarged electrodes facing each other, and is formed of a material having a high permeability and conductivity. In particular, the thickness along the direction perpendicular to the first substrate is greater than the width along the longitudinal direction of the address electrode or the width along the direction perpendicular thereto, thereby contributing to the reduction of the discharge start voltage, It can reduce blocking.

The island-type electrodes may be arranged one by one at each end edge of the enlarged electrode facing each other, or several island-type electrodes may be spaced apart by a predetermined distance, and the island-type electrodes may each be disposed at the end edges of the enlarged electrode facing each other. It may be arranged spaced apart. In addition, one each may be disposed only at the end centers of the enlarged electrodes facing each other.

Hereinafter, 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, Figure 2 is a partial plan view showing a plasma display panel according to an embodiment of the present invention, Figure 3 is a In order to explain the discharge start position and the main discharge position in the plasma display panel according to the exemplary embodiment, the partial cross-sectional view taken along the line II of FIG. 1 while the first substrate and the second substrate are combined.

Referring to FIG. 1, the plasma display panel according to the present embodiment includes a first substrate 10 (hereinafter referred to as a “back substrate”) and a second substrate 20 (hereinafter referred to as a “front substrate”) having an arbitrary size. ) Are substantially parallel to each other at predetermined intervals, and a plurality of discharge cells 18 are partitioned by the partition wall 16 in the space between the rear substrate 10 and the front substrate 20.

A plurality of address electrodes 12 are formed along one direction (y-axis direction of the drawing) on the opposite surface of the front substrate 20 of the back substrate 10, and cover the address electrodes 12 to cover the back substrate 10. The dielectric layer 14 is formed on the front side. The address electrodes 12 are located side by side with a predetermined distance from the neighboring ones.

A partition wall 16 is formed on the dielectric layer 14 to partition the plurality of discharge cells 18. The partition wall 16 has a direction in which the first partition member 16a is formed along a direction parallel to the address electrode 12 (y-axis direction in the drawing) and the first partition member 16a intersects the direction (x-axis direction in the drawing). It includes a second partition member (16b) formed along the). Such a barrier rib structure is not limited to the above-described structure, and a barrier rib structure having various shapes such as a stripe-type barrier rib structure made of only a barrier rib member parallel to the address electrode can be applied to the present invention, which is also within the scope of the present invention.

A red (15R), green (15G) and blue (B) phosphor layer 15 is formed in the discharge cell 18 and a discharge gas (for example, a mixed gas of Xe and Ne) is injected to cause a predetermined discharge and light emission. do.

On the opposite side of the back substrate 10 of the front substrate 20, the display electrode 21 including the scan electrode 21 and the sustain electrode 22 along the direction crossing the address electrode 12 (the x-axis direction in the drawing). , 22) are formed. The display electrodes 21 and 22 extend from the bus electrodes 21b and 22b extending along the direction crossing the address electrode 12 (x-axis direction in the drawing) and the discharge cells 18 from the bus electrodes 21b and 22b. It includes a magnifying electrode (21a, 22a) extending toward the center of. For example, a pair of bus electrodes 21b and 22b may correspond to each discharge cell 18. At this time, a pair of enlarged electrodes 21a and 22a may be formed to face each other in each discharge cell 18.

In the present exemplary embodiment, the enlarged electrodes 21a and 22a serve to cause plasma discharge in the discharge cells 18 and cross the bus electrodes 21b and 22b from the bus electrodes 21b and 22b. A first portion 21aa, 22aa extending in a direction, and branched second portions 21ab, 22ab branching from the first portions 21aa, 22aa, and the second portions 21ab, 22ab The concave portions 21ac and 22ac formed to face each other at the center of each discharge cell between at least one pair of branches reduce the area of the enlarged electrodes 21a and 22a of the portions which contribute little to the discharge. As a result, the current flowing through the enlarged electrodes 21a and 22a can be reduced.

Meanwhile, the enlarged electrodes 21a and 22a may be made of indium tin oxide (ITO), which is a transparent material, to secure the aperture ratio, and the bus electrodes 21b and 22b may be formed of the enlarged electrodes 21a and 22a. It is made of an opaque metal material to compensate for high resistance and to secure conductivity.

The dielectric layer 24 is formed on the front substrate 20 while covering the display electrodes 21 and 22. The dielectric layer 24 is formed with an opening 24a exposing a portion of the front substrate 20 on a surface opposite the rear substrate 10.

An MgO passivation layer 26 is formed on the front substrate 20 to cover the dielectric layer 24. Openings 26a are formed in the MgO protective film 26 at positions corresponding to the openings 24a of the dielectric layer. The MgO passivation layer 26 protects the dielectric layer 24 from collision of ionized ions during plasma discharge, and increases discharge efficiency by having a high secondary electron emission coefficient.

2 and 3, in this embodiment, the opening 24a of the dielectric layer is formed to correspond to the center portion of each discharge cell 18 between the facing electrodes 21a and 22a facing each other. The opening portion 24a shortens the path D of discharge formed between the display electrodes 21 and 22. That is, since the discharge path between the display electrodes 21 and 22 may be formed through the opening 24a of the dielectric layer between the display electrodes 21 and 22, the discharge path D is straightened to shorten the path. . In this embodiment, the discharge voltage generated between the display electrodes 21 and 22 can be reduced by shortening the discharge path D. FIG.

Meanwhile, island electrodes 21ba and 22ba are further disposed at ends of the second portions 21ab and 22ab of the enlarged electrodes 21a and 22a. The island electrodes 21ba and 22ba are made of an opaque metal material to compensate for the high resistance of the second portions 21ab and 22ab of the enlarged electrodes 21a and 22a to secure conductivity. It is arranged opposite to the center 24a and serves to lower the discharge start voltage by initiating a discharge in a counter discharge manner as shown in FIG. Subsequently, since the main discharge occurs between the bus electrodes 21a and 22b, the discharge occurs evenly inside the discharge cell. The island-type electrodes 21ba and 22ba form a relatively large thickness along the direction perpendicular to the first substrate 10 to increase the effect of the counter discharge, thereby contributing to the reduction of the discharge start voltage and providing visible light emitted inside the cell. You can at least block it. In the present exemplary embodiment, the island-type electrodes 21ba and 22ba may have a thickness in a vertical direction of the first substrate greater than a width in a longitudinal direction of the address electrode or a width in a direction perpendicular thereto. have.

Hereinafter, a plasma display panel according to another exemplary embodiment of the present invention will be described in detail. Another embodiment of the present invention is a plasma display panel having the same basic configuration as the above-described embodiment of the present invention and having a different structure of the display electrode. Therefore, the same reference numerals are used for the same components as in the exemplary embodiment of the present invention.

4A to 4B are schematic plan views illustrating a structure of a display electrode by selecting one discharge cell of a plasma display panel according to another exemplary embodiment of the present invention corresponding to part A of FIG. 2.

4A to 4B, the display electrodes 31 and 32 include bus electrodes 31b and 32b extending along a direction crossing the address electrode 12 (the x-axis direction in the drawing) and the bus electrodes ( And rectangular enlarged electrodes 31a and 32a extending from 31b and 32b toward the center of the discharge cell. The enlarged electrodes 31a and 32a play a role of causing plasma discharge in the discharge cells 18 and are made of indium tin oxide (ITO), which is a transparent material, to secure the aperture ratio, and the bus electrodes 31b. , 32b is to compensate for the high resistance of the enlarged electrodes 31a and 32a to ensure conductivity, and may be made of an opaque metal material. In this case, a pair of bus electrodes 31b and 32b may be formed to correspond to each discharge cell 18, and a pair of enlarged electrodes 31a and 32a may be formed to face each other in each discharge cell 18.

In this embodiment, the enlarged electrodes 31a and 32a extend from the bus electrodes 31b and 32b in the direction intersecting with the bus electrodes 31b and 32b (y-axis direction in the drawing), and the center portion of each discharge cell 18 is provided. Island electrodes 31ba and 32ba are provided at the end portions corresponding thereto. One of these island-type electrodes 31ba and 32ba may be disposed at each of the end edges of the enlarged electrodes 31a and 32a facing each other as shown in FIG. 4A, and each of the enlarged electrodes 31a and 32a facing each other as shown in FIG. It may be disposed in the center of the end portion, or may be disposed inwardly according to the discharge pattern from the end edges of the enlarged electrodes 31a and 32a facing each other, as shown in FIG. 4C, and as shown in FIG. In addition, as shown in Figure 4d may be arranged spaced apart by three.

 In addition, an opening 24a may be formed in the dielectric layer 24 between the ends of the pair of enlarged electrodes 31a and 32a facing each other at the center of each discharge cell 18, thereby reducing the discharge path. Can lower the voltage.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and 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

As described above, the plasma display panel according to the present invention further comprises an island-type electrode on an end portion of the display electrode corresponding to the center of the discharge cell and forms an opening in the dielectric layer therebetween. It is possible to provide a plasma display panel having a low discharge start voltage because the counter discharge driving is possible.

In addition, in the present invention, by forming the island-type electrode to have a large thickness used for opposing discharge, the discharge initiation voltage can be further reduced, and the blocking of visible light can be reduced by minimizing the width and length of a portion not used for opposing discharge. It has the advantage that the brightness can be increased.

That is, the power consumption of the plasma display panel can be reduced and the brightness can be improved, thereby improving the efficiency of the plasma display panel.

Claims (18)

A first substrate and a second substrate disposed to face each other; Address electrodes formed in one direction on the first substrate; A partition wall partitioning a discharge cell in a space between the first substrate and the second substrate; A phosphor layer formed in the discharge cell; A pair of bus electrodes extending in a direction crossing the address electrode on the second substrate; A first portion extending from the bus electrode in a direction crossing the bus electrode and a branched second portion branching from the first portion, the second portion being discharged between at least one pair of branches; Display electrodes formed in the center of the cell facing each other to form concave portions and provided as transparent electrodes and extending toward the center of each discharge cell from the bus electrode and including a pair of magnification electrodes facing each other; A dielectric layer covering the display electrodes and formed on the second substrate and having an opening exposing a portion of the second substrate between at least one pair of display electrodes corresponding to each discharge cell; And And an island type electrode disposed at an end portion of the pair of enlarged electrodes disposed toward the center of each discharge cell. delete delete The method of claim 1, And an opening of the dielectric layer is formed between the second portions of the facing magnification electrodes. The method of claim 1, And the island type electrode is disposed at an end portion of the second portion of the enlarged electrode facing each other. The method of claim 1, The island type electrode is non-transmissive plasma display panel. The method of claim 1, And the island-type electrode has a thickness along a direction perpendicular to the first substrate to be greater than a width along the address electrode direction. The method of claim 1, And the island type electrode has a thickness along a direction perpendicular to the first substrate to a width greater than a width along a direction perpendicular to the address electrode direction. delete A first substrate and a second substrate disposed to face each other; Address electrodes formed in one direction on the first substrate; A partition wall partitioning a discharge cell in a space between the first substrate and the second substrate; A phosphor layer formed in the discharge cell; A pair of bus electrodes extending in a direction crossing the address electrode on the second substrate and extending from the bus electrode toward the center of the discharge cell and crossing from the bus electrode to the bus electrode; Display electrodes including a pair of enlarged electrodes facing each other formed of electrodes; A dielectric layer covering the display electrodes and formed on the second substrate and having an opening exposing a portion of the second substrate between at least one pair of display electrodes corresponding to each discharge cell; And And an island type electrode disposed at each of the end edges of the pair of enlarged electrodes disposed toward the center of each discharge cell. A first substrate and a second substrate disposed to face each other; Address electrodes formed in one direction on the first substrate; A partition wall partitioning a discharge cell in a space between the first substrate and the second substrate; A phosphor layer formed in the discharge cell; A pair of bus electrodes extending in a direction crossing the address electrode on the second substrate and extending from the bus electrode toward the center of the discharge cell and crossing from the bus electrode to the bus electrode; Display electrodes including a pair of enlarged electrodes facing each other formed of electrodes; A dielectric layer covering the display electrodes and formed on the second substrate and having an opening exposing a portion of the second substrate between at least one pair of display electrodes corresponding to each discharge cell; And And an island-type electrode spaced apart from an end edge of the pair of magnification electrodes disposed toward the center of each of the discharge cells. A first substrate and a second substrate disposed to face each other; Address electrodes formed in one direction on the first substrate; A partition wall partitioning a discharge cell in a space between the first substrate and the second substrate; A phosphor layer formed in the discharge cell; A pair of bus electrodes extending in a direction crossing the address electrode on the second substrate and extending from the bus electrode toward the center of the discharge cell and crossing from the bus electrode to the bus electrode; Display electrodes including a pair of enlarged electrodes facing each other formed of electrodes; A dielectric layer covering the display electrodes and formed on the second substrate and having an opening exposing a portion of the second substrate between at least one pair of display electrodes corresponding to each discharge cell; And And an island type electrode disposed at an end of each of the pair of enlarged electrodes disposed toward the center of each of the discharge cells. delete The method according to any one of claims 10 to 12, And the island type electrode is disposed on the enlarged electrode and disposed at an end portion opposite to the bus electrode. The method according to any one of claims 10 to 12, And the island type electrode is disposed adjacent to the opening of the dielectric layer. The method according to any one of claims 10 to 12, The island type electrode is non-transmissive plasma display panel. The method according to any one of claims 10 to 12, And the island-type electrode has a thickness along a direction perpendicular to the first substrate to be greater than a width along a length direction of the address electrode. A first substrate and a second substrate disposed to face each other; Address electrodes formed in one direction on the first substrate; A partition wall partitioning a discharge cell in a space between the first substrate and the second substrate; A phosphor layer formed in the discharge cell; A pair of bus electrodes extending in a direction crossing the address electrode on the second substrate and extending from the bus electrode toward the center of the discharge cell and crossing from the bus electrode to the bus electrode; Display electrodes including a pair of enlarged electrodes facing each other formed of electrodes; A dielectric layer covering the display electrodes and formed on the second substrate and having an opening exposing a portion of the second substrate between at least one pair of display electrodes corresponding to each discharge cell; And An island type disposed at a center of an end portion of the pair of enlarged electrodes disposed toward the center of each discharge cell and having a thickness along a direction perpendicular to the first substrate being greater than a width along a length direction of the address electrode; A plasma display panel comprising an electrode.

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