KR100669379B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel having an electrode 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, and a partition wall is disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells. A phosphor layer is formed inside each discharge cell. In addition, address electrodes are formed in one direction on the first substrate, and first and second electrodes are formed in a direction crossing the address electrode on the second substrate. In addition, a third electrode is formed between the first electrode and the second electrode in a direction crossing the address electrode on the second substrate. In this case, a protruding portion protruding toward the first electrode is formed at an edge of the third electrode facing the first electrode, and an edge of the third electrode is straight.

Plasma Display Panels, Projections, Recesses, Electrodes

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

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

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an electrode structure capable of realizing high efficiency.

In general, a plasma display panel (PDP) is a display device that displays an image using visible light generated by excitation of a phosphor by a vacuum ultraviolet ray (VUV) emitted from a plasma formed by gas discharge. The plasma display panel has a high resolution and large screen configuration, and has been in the spotlight as the next generation thin display device.

The general structure of the plasma display panel is a three-electrode surface discharge type structure. The three-electrode surface discharge type structure includes a front substrate on which a display electrode is formed and a rear substrate spaced apart from the substrate by a predetermined distance, and a space between the two substrates is divided by a partition wall. . The display electrode has a long stripe shape.

In the plasma display panel configured as described above, millions of unit discharge cells are arranged. In order to drive the plasma display panel, driving using the memory characteristic is performed.

In the plasma display panel driven as described above, several steps are taken from the input power to the final visible light, and energy conversion efficiency in each process is not good. In addition, there is a problem in that the display electrode is formed in a stripe shape, so that a large amount of current flows even at a portion which contributes little to the discharge, causing mis-discharge.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a plasma display panel which can improve efficiency by reducing current consumption and preventing mis-discharge by improving the structure of the display electrode.

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, and a partition wall is disposed in a space between the first substrate and the second substrate. A plurality of discharge cells are partitioned, and a phosphor layer is formed inside each discharge cell. In addition, address electrodes are formed in one direction on the first substrate, and first and second electrodes are formed in a direction crossing the address electrode on the second substrate. In addition, a third electrode is formed between the first electrode and the second electrode in a direction crossing the address electrode on the second substrate. In this case, a protruding portion protruding toward the first electrode is formed at an edge of the third electrode that faces the first electrode, and has a straight edge shape that faces the second electrode.

The third electrode may include a bus electrode extending in a direction crossing the address electrode and an enlarged electrode having a protrusion protruding from the bus electrode toward the first electrode. The protruding portion of the third electrode may be formed to correspond to the center of the discharge cell.

Each of the first electrode and the second electrode includes a bus electrode extending in a direction crossing the address electrode, an enlarged electrode extending from the bus electrode toward the first electrode, and the first electrode and the second electrode. An electrode may have a recess formed at an edge of the third electrode side of the enlarged electrode.

The distance between the third electrode and the second electrode may be greater than the distance between the third electrode and the first electrode at the center of the discharge cell.

The first electrode and the second electrode may be formed such that the width of the enlarged electrode becomes narrower as it moves away from the center of the discharge cell at an end adjacent to the bus electrode.

The first electrode and the second electrode may be formed to correspond to both edges of the discharge cell, and the third electrode may be formed to correspond to the center of the discharge cell.

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 an 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.

Referring to FIG. 1, in the plasma display panel according to the present exemplary embodiment, the first substrate 10 (hereinafter referred to as a "back substrate") and the second substrate 20 (hereinafter referred to as a "front substrate") are provided at predetermined intervals. The plurality of discharge cells 18 are partitioned by partition walls 16 in the space between the rear substrate 10 and the front substrate 20.

On the opposite side of the front substrate 20 of the back substrate 10, address electrodes 12 are formed side by side in one direction (y-axis direction of the drawing), and covering the address electrodes 12, 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. In the present embodiment, the partition wall 16 has the first partition member 16a formed along the direction parallel to the address electrode 12 (the y-axis direction in the drawing), and has a predetermined inclination angle with the first partition member 16a. And a second partition wall member 16b formed to intersect. Discharge cells 18 may be formed to have independent cell structures by the partitions 16, and may be configured to facilitate diffusion of discharge gas by minimizing a small portion contributing to discharge and brightness.

That is, when the width of the discharge cell 18 is measured along the direction crossing the address electrode (x-axis direction in the figure), the width Wc at the center of the discharge cell 18 is the edge of the discharge cell 18. It is larger than the width (We) at. To this end, the width of the discharge cell 18 at the end portion positioned in the direction parallel to the address electrode 12 (y-axis direction in the drawing) becomes narrower as it moves away from the center of the discharge cell 18. Accordingly, both ends of the discharge cells 18 located in the direction parallel to the address electrode 12 (y-axis direction in the drawing) may have a trapezoidal shape, and the overall planar shape of each discharge cell 18 may be octagonal. .

The barrier ribs and the discharge cell structure are not limited to the above-described structure, and various barrier rib structures such as a stripe barrier rib structure including only barrier ribs in parallel with the address electrode may be applied to the present invention. It may have a structure, which also belongs to the scope of the present invention.

In the discharge cell 18, red, green, and blue phosphor layers 19 which absorb vacuum ultraviolet radiation emitted by discharge and emit visible light are formed, and discharge gas (for example, a mixed gas of Xe and Ne) is injected. So that a predetermined discharge and light emission can occur.

One surface of the front substrate 20 facing the rear substrate 10 may have a first electrode 21, a second electrode 22, and a third electrode in a direction crossing the address electrode 12 (the x-axis direction of the drawing). The electrode 23 is formed. In this case, the first and second electrodes 21 and 22 are formed to correspond to both edges of the discharge cells 18, and the third electrode 23 is the first electrode 21 and the second electrode 22. It is disposed between and formed corresponding to the central part of each discharge cell 18.

The first, second, and third electrodes 21, 22, and 23 are bus electrodes 21b, 22b, and 23b extending along the direction intersecting with the address electrode 12 (the x-axis direction in the drawing), and the bus It includes expansion electrodes 21a, 22a, 23a extending from the electrodes 21b, 22b, 23b. In this case, the enlargement electrodes 21a, 22a, and 23a may be made of a transparent electrode made of indium tin oxide (ITO) to secure the aperture ratio, and the bus electrodes 21b, 22b, and 23b may be enlarged electrodes ( 21a, 22a, and 23a may be made of a metal electrode to ensure high electrical conductivity by compensating for the high resistance.

Referring to FIG. 2, each of the enlarged electrodes 21a and 22a of the first and second electrodes 21 and 22 is connected to the third electrode 23, that is, the discharge cell 18 from the corresponding bus electrodes 21b and 22b. Extend toward the center; At this time, the first and second electrodes 21 and 22 become narrower as the widths of the enlarged electrodes 21a and 22a become farther away from the center of the discharge cell 18 in a portion adjacent to the bus electrodes 21b and 22b. Can be formed. By having such a structure, the area of the enlargement electrodes 21a and 22a can be reduced in the portion which contributes to discharge, and the current which flows through the enlargement electrodes 21a and 22a can be reduced by this.

In the present embodiment, recesses 211 and 221 are formed at edges of the third electrode 23 on each of the enlarged electrodes 21a and 22a of the first and second electrodes 21 and 22. The recesses 211 and 221 are located corresponding to the center of the discharge cell 18.

A protruding portion extending toward the first electrode 21 and positioned corresponding to the center of each discharge cell 18 at the edge of the enlarged electrode 23a of the third electrode 23 facing the first electrode 21. 231 is formed. The recessed part 211 formed in the enlarged electrode 21a of the first electrode 21 has a shape corresponding to the protrusion 231 formed in the enlarged electrode 23a of the third electrode 23. In addition, the edges of the enlarged electrode 23a of the third electrode 23 facing the second electrode 22 may have a straight shape.

Due to the structure of the third electrode 23, the third electrode 23 and the second electrode 22 than the distance t1 between the third electrode 23 and the first electrode 21 at the center of the discharge cell 18. The distance t2 between) is made larger.

The dielectric layer 24 and the MgO passivation layer 26 are sequentially formed on the front surface of the front substrate 20 while covering the first, second and third electrodes 21, 22, and 23. The MgO protective layer 26 prevents damage to the dielectric layer 24 caused by collision of ionized ions during plasma discharge, and improves efficiency by emitting secondary electrons during collision of ions.

The driving of the plasma display panel can be largely divided into a reset period, a scan period, and a sustain period. The reset section is a section to make the wall charges of all the discharge cells in the same state. The scan section is a section to select the discharge cells to display by generating an address discharge and to accumulate wall charges in the corresponding discharge cells. In this section, sustain discharge is generated in the selected discharge cell to cause display discharge in the selected discharge cell.

The plasma display panel according to the present exemplary embodiment has a four-electrode structure in which the Y electrode, the X electrode, and the M electrode correspond to one discharge cell. For example, in the present embodiment, the first electrode 21 functions as the Y electrode, the second electrode 22 functions as the X electrode, and the third electrode 23 functions as the M electrode.

That is, in the scan section, an address discharge is generated between the third electrode 23 and the address electrode by applying a predetermined voltage, and in the discharge sustain section, the first electrode 21 and the third electrode 23 are initially discharged. The discharge is caused to occur and after that the discharging is maintained between the first electrode 21 and the second electrode 22.

Therefore, the sustain discharge starts in the short gap of the first electrode 21 and the third electrode 23 to reduce the discharge start voltage and reduce the discharge electrode voltage of the first electrode 21 and the second electrode 22. Discharge efficiency can be improved by discharging in a long gap.

In the present exemplary embodiment, the protrusion 231 is formed only at the edge of the first electrode 21 on the enlarged electrode 23a of the third electrode 23. Accordingly, the distance t1 between the third electrode 23 and the first electrode 21 is relatively small at the center of the discharge cell 18, and the distance between the third electrode 23 and the second electrode 22 is relatively small. The relatively large (t2) is formed, thereby erroneous discharge that may be generated by the second electrode 22 while facilitating the discharge occurring between the first electrode 21 and the third electrode 23 at the beginning of the discharge holding section. Can be prevented.

In addition, since the protrusion is not formed at the edge of the second electrode 22 in the enlarged electrode 23a of the third electrode 23, the area of the enlarged electrode 23a can be reduced at a portion that contributes to the discharge. As a result, the current flowing in proportion to the electrode can be reduced. In the present embodiment, the aperture ratio can be further improved by removing a part of the magnification electrode 23a.

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 the range of.

As described above, the plasma display panel according to the present invention improves the structure of the third electrode, i.e., the M electrode, to prevent unnecessary erroneous discharge caused by the second electrode, i.e., the X electrode, at the beginning of the sustain discharge. By eliminating the enlarged electrode having a small contribution degree, the current consumption can be reduced and the aperture ratio can be improved.

In addition, the start of the sustain discharge occurs in the short gap, thereby reducing the discharge start voltage, while the discharge of the sustain discharge occurs in the relatively long gap, thereby improving the discharge efficiency.

As a result, the efficiency of the plasma display panel can be improved by reducing the power for driving the plasma display panel.

Claims (7)

A first substrate and a second substrate disposed to face each other; Address electrodes formed in one direction on the first substrate; Barrier ribs defining a plurality of discharge cells in a space between the first substrate and the second substrate; Phosphor layers formed in each of the discharge cells; First and second electrodes formed on the second substrate in a direction crossing the address electrode; And A third electrode formed on the second substrate in a direction crossing the address electrode and disposed between the first electrode and the second electrode; Including, The third electrode may include a bus electrode extending in a direction crossing the address electrode and an enlarged electrode having a protrusion protruding from the bus electrode toward the first electrode, wherein the protrusion is formed on the first electrode. A plasma display panel protruding toward the first electrode at an opposite edge and having a straight edge facing the second electrode. delete The method of claim 1, The protrusion of the third electrode corresponds to a central portion of the discharge cell. The method of claim 1, Each of the first electrode and the second electrode includes a bus electrode extending in a direction crossing the address electrode, and an enlarged electrode extending from the bus electrode toward the first electrode, The enlarged electrode of the first electrode and the second electrode, the concave portion is formed in the edge of the third electrode side. The method of claim 1, And a distance between the third electrode and the second electrode is greater than a distance between the third electrode and the first electrode at the center of the discharge cell. The method of claim 4, wherein And the first electrode and the second electrode are formed such that the width of the enlarged electrode becomes narrower as it moves away from the center of the discharge cell at an end adjacent to the bus electrode. The method of claim 1, The first electrode and the second electrode are formed corresponding to both edges of the discharge cell, the third electrode is formed corresponding to the center of the discharge cell.

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