KR100637523B1 - Plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel in which a discharge path is uniform during address discharge and an electric field is evenly distributed in a discharge cell, thereby enabling stable operation at a low driving voltage.

First and second substrates disposed to face each other at arbitrary intervals; Address electrodes formed on the first substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition the discharge cells; A red, green or blue fluorescent layer located in each discharge cell; The present invention provides a plasma display panel including sustain electrodes formed on a second substrate, and at least one floating electrode positioned at an arbitrary distance from an address electrode in each discharge cell.

Plasma, display, address electrode, sustain electrode, scan electrode, common electrode, fluorescent layer, floating electrode

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a partial plan view illustrating the assembled state of FIG. 1. FIG.

3 is a partial cross-sectional view showing the assembled state of FIG.

4 is a schematic diagram showing a discharge path that appears during address discharge.

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

6 and 7 are partially exploded perspective views and partially assembled cross-sectional views of the plasma display panel according to the prior art, respectively.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a three-electrode surface discharge structure including an address electrode on a rear substrate and a scan electrode and a common electrode on a front substrate to form discharge cells. will be.

In general, a plasma display panel (hereinafter, referred to as a 'PDP') is a display panel that realizes an image by exciting phosphors by vacuum ultraviolet rays caused by gas discharge occurring in a discharge cell. It is attracting attention as a thin display device.

FIG. 6 is a partially exploded perspective view illustrating an AC PDP having a three-electrode surface discharge structure according to the prior art, and FIG. 7 is a partial cross-sectional view illustrating an assembled state of FIG. 6.

Referring to the drawings, an address electrode 3, a partition 5, and a fluorescent layer 7 are formed on a rear substrate 1, and a scan electrode 11 and a common electrode 13 are formed on a front substrate 9. The sustain electrode 15 is formed. The address electrode 3 and the sustain electrode 15 are covered with the first dielectric layer 17 and the second dielectric layer 19, respectively, and the discharge gas inside the discharge cell where the address electrode 3 and the sustain electrode 15 cross each other. (Mostly Ne-Xe mixed gas). For reference, reference numeral 21 in the drawing represents an MgO protective film covering the second dielectric layer 19.

With the above configuration, when the address voltage Va is applied between the address electrode 3 and the scan electrode 11, an address discharge occurs in the discharge cell, and the second dielectric layer covering the sustain electrode 15 as a result of the address discharge. (19) The charge builds up, which is called wall charge. The space voltage formed between the scan electrode 11 and the common electrode 13 by the wall charge is called a wall voltage (Vw), and a discharge cell in which light emission is generated by generating wall charge is selected.

Subsequently, when the sustain voltage Vs is applied between the scan electrode 11 and the common electrode 13 of the selected discharge cell, the sum of the sustain voltage Vs and the wall voltage Vw is required to start discharge. Plasma discharge, that is, sustain discharge occurs while exceeding the voltage Vf. Vacuum ultraviolet rays are emitted from the excitation atoms of Xe produced during plasma discharge, and the vacuum ultraviolet rays excite the fluorescent layer 7 to emit visible light, thereby enabling color display.

In the PDP operating as described above, the address electrode 3 has a stripe pattern passing perpendicular to the scan electrode 11 and the common electrode 15 and passing through the center of each discharge cell. At this time, since the width W of the address electrode 3 with respect to the horizontal pitch Ph of the discharge cells is limited, the address electrodes 3 are disposed to face the scan electrode 11 with a narrow area.

As a result, when the address voltage Va is applied between the address electrode 3 and the scan electrode 11 to generate an address discharge, the movement paths of electrons and ions, i.e., the discharge paths, based on the X-direction cross section of FIG. 7, the discharge path (indicated by the dotted line) in the discharge cell shows a radiation pattern that is widely diffused from the address electrode 3 toward the scan electrode 11.

Therefore, in the conventional PDP, discharge paths appear unevenly between the address electrode 3 and the scan electrode 11 during address discharge, and the electric field is not evenly distributed in the discharge cell.

As a result, the conventional PDP has a disadvantage in that the stability of the address discharge is lowered, which may cause erroneous discharge, and the reaction time is slow. In addition, the conventional PDP has a weak strength of address discharge, and thus does not sufficiently generate wall charges for sustain discharge, which causes the address voltage Va and the sustain voltage Vs to be increased. Has a disadvantage of lowering the luminance ratio).

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to uniformize the discharge path between the address electrode and the scan electrode during address discharge, and to evenly distribute the electric field in the discharge cell, thereby increasing the stability of the address discharge. In addition, the present invention provides a plasma display panel capable of driving a low voltage by increasing the intensity of address discharge.

In order to achieve the above object, the present invention,

First and second substrates disposed to face each other at random intervals, address electrodes formed on the first substrate, partition walls disposed in a space between the first substrate and the second substrate to partition discharge cells, respectively; A red, green, or blue fluorescent layer located in the discharge cells of the substrate; sustain electrodes formed on the second substrate; and at least one floating electrode positioned at an arbitrary distance from the address electrode in each discharge cell. Provided is a plasma display panel.

The floating electrode is independently positioned in each discharge cell without receiving a voltage from the outside, and preferably, a pair of floating electrodes are symmetrically disposed on the left and right sides of the address electrode.

The sustain electrode includes a pair of scan electrodes and a common electrode, and the floating electrode is positioned directly below the scan electrode to face the scan electrode, or a part of the floating electrode is directly below the scan electrode and the common electrode. It is positioned in the opposite side to the scan electrode and the common electrode.

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

1 is a partially exploded perspective view of a plasma display panel according to a first exemplary embodiment of the present invention, and FIGS. 2 and 3 are partial plan views and partial cross-sectional views respectively illustrating an assembled state of FIG. 1.

Referring to the drawings, the plasma display panel according to the present embodiment (hereinafter referred to as 'PDP') is the rear substrate 2 (hereinafter referred to as 'first substrate') and the front substrate 4 (hereinafter referred to as 'second' The substrates' are disposed to face each other at random intervals, and discharge cells 6R, 6G, and 6B are provided in the spaces between the two substrates so that the discharge cells 6R, 6G, and 6B are independent of the discharge mechanisms. Visible light emission produces an arbitrary color image.

In detail, the address electrodes 8 are formed in one direction (Y direction of the drawing) on the inner surface of the first substrate 2, and cover the address electrodes 8 to cover the first substrate 2. The first dielectric layer 10 is formed on the entire inner surface. The address electrodes 8 are formed in a stripe pattern, for example, and are arranged side by side with a predetermined distance from the neighboring address electrodes 8.

On the first dielectric layer 10, a partition 12, for example, a stripe pattern partition 12 parallel to the address electrode 8, is disposed on the side surface of the partition 12 and the upper surface of the first dielectric layer 10. Green and blue fluorescent layers 14R, 14G and 14B are provided in this order. At this time, the shape of the partition wall 12 is not limited to the stripe pattern, it may be formed of a closed structure such as a lattice or other patterns.

In addition, the inner surface of the second substrate 4 facing the first substrate 2 is formed of the scan electrode 16 and the common electrode 18 along the direction orthogonal to the address electrode 8 (the X direction in the drawing). The electrode 20 is formed, and the second dielectric layer 22 and the MgO passivation layer 24 that are transparent are disposed on the entire inner surface of the second substrate 4 while covering the sustain electrodes 20.

In this embodiment, the scan electrode 16 and the common electrode 18 are positioned at one edges of the stripe patterned transparent electrodes 16a and 18a and the transparent electrodes 16a and 18a, respectively. It consists of bus electrodes 16b and 18b which complement conductivity. Indium tin oxide (ITO) is preferable as the transparent electrodes 16a and 18a, and metals containing silver (Ag), aluminum (Al), or copper (Cu) are used as the bus electrodes 16b and 18b. Electrodes are preferred.

By the combination of the first substrate 2 and the second substrate 4 described above, the discharge space where the address electrode 8 and the sustain electrode 20 intersect constitute one discharge cell, and the discharge cells 6R and 6G. , 6B) is filled with discharge gas (mainly Ne-Xe mixed gas).

Here, the PDP according to the present invention includes at least one floating electrode 26 positioned at an arbitrary distance from the address electrode 8 on the first substrate 2 so that the address electrode 8 and the scan electrode at the time of address discharge. The discharge path between (16) is made uniform, and the structure which distributes an electric field uniformly in a discharge cell is provided.

More specifically, the floating electrode 26 is located separately from the address electrode 8 and does not receive a separate voltage from the outside. In other words, the floating electrode 26 is formed of a conductive film in which at least one is independently connected to each of the discharge cells 6R, 6G, and 6B without being connected to the outside. For example, the floating electrode 26 may be formed of the same conductive material as that of the address electrode 8, and may be simultaneously formed when the address electrode 8 is patterned.

In particular, in the present embodiment, as shown in FIGS. 2 and 3, the floating electrode 26 is provided with a pair of floating electrodes 26 on the left and right sides of the address electrode 8 symmetrically, and the floating electrode 26 is provided. Is positioned directly below the scan electrode 16 so as to face the scan electrode 16. As a result, the scan electrode 16 is disposed opposite the address electrode 8 as well as the pair of floating electrodes 26 in each of the discharge cells 6R, 6G, and 6B.

By the above-described configuration, for example, when the address voltage Va is applied between the address electrode 8 and the scan electrode 16 of the red discharge cell 6R, plasma is generated in the discharge cell 6R, and the inside of the plasma is generated. The electrons and ions move toward the electrode with opposite polarity, causing the current to flow. In this address period, a voltage of approximately +80 volts is applied to the address electrode 8, and a voltage of zero or lower volts is applied to the scan electrode 16 to cause an address discharge.

At this time, the floating electrode 26 is a potential between the address electrode 8 and the scan electrode 16, that is, the address electrode, due to the potential difference between the address electrode 8 and the scan electrode 16 even when no voltage is applied from the outside. It is lower than (8) and has a potential higher than that of the scan electrode 16, which is about +60 volts.

As a result, referring to the movement paths of the electrons and charges in the discharge cells 6R, that is, the discharge paths, as shown in FIG. 4, the discharge paths are not only between the address electrode 6 and the scan electrode 16, but also the floating electrodes 26. ) And the scan electrode 16 appear to show a relatively uniform discharge path in the discharge cell 6R. The uniform discharge path as described above has an effect of stabilizing the address discharge to prevent erroneous discharge of the PDP.

In addition, the PDP according to the present embodiment has the advantage that the electric field is uniformly distributed in the discharge cell 6R by the floating electrode 26, thereby enhancing the intensity of the address discharge. As a result of the address discharge, wall charges are sufficiently generated over the second dielectric layer 22 covering the scan electrode 16 and the common electrode 18 to facilitate sustain discharge. Therefore, the PDP according to the present embodiment can lower the address voltage Va and the sustain voltage Vs, thereby enabling low voltage driving. At this time, the function of the above-mentioned floating electrode 26 is similarly applied to the green discharge cell 6G and the blue discharge cell 6B.

5 is a partial plan view of a PDP according to a second embodiment of the present invention, and describes a deformed structure of the floating electrode.

Referring to the drawings, the present embodiment is based on the structure of the first embodiment described above, and a part thereof is directly under the scan electrode 16 such that the floating electrode 28 faces the scan electrode 16 and the common electrode 18. PDPs are formed directly below the common electrode 18 and the common electrode 18. That is, in the present exemplary embodiment, the floating electrode 28 is disposed to face the center of the sustain electrode 20 so that the upper portion thereof faces the scan electrode 16 and the lower portion thereof faces the common electrode 18.

Meanwhile, in the above-described first and second embodiments, the planar shape of the floating electrodes 26 and 28 is not limited to the rectangular shapes shown in FIGS. 2 and 5, and may be formed in various shapes such as circular, elliptical, or polygonal.

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, according to the present invention, the above-mentioned floating electrode makes the discharge path uniform during the address discharge, thereby stabilizing the address discharge, and the electric field is uniformly distributed in the discharge cell, thereby enhancing the intensity of the address discharge. Therefore, the plasma display panel according to the present invention can lower the address voltage and the sustain voltage, thereby enabling stable driving even at a lower discharge voltage.

Claims (6)

A front substrate and a rear substrate disposed to face each other at arbitrary intervals; Address electrodes formed on opposite surfaces of the rear substrate facing the front substrate; A dielectric layer formed on an inner surface of the rear substrate while covering the address electrodes; Barrier ribs disposed in a space between the front substrate and the rear substrate to partition discharge cells; A red, green, or blue fluorescent layer located within each discharge cell; Sustain electrodes formed along a direction crossing the address electrode on an opposite surface of the front substrate facing the rear substrate; And A floating electrode which is spaced apart from the address electrode and covered by the dielectric layer and is not applied with an independent voltage from the outside. Plasma display panel comprising a. delete The method of claim 1, And a pair of floating electrodes symmetrically positioned at left and right sides of the address electrode. The method of claim 1, And the sustain electrode comprises a pair of scan electrodes and a common electrode. The method according to claim 1 or 4, And the floating electrode is disposed directly below the scan electrode to face the scan electrode. The method according to claim 1 or 4, And a portion of the floating electrode is disposed directly below the scan electrode and the common electrode so that the floating electrode is disposed to face the scan electrode and the common electrode.

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