KR100684745B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel that can improve the discharge efficiency by improving the structure of the electrode. 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 to be parallel to the first substrate in one direction, and the first substrate and the second substrate. A partition wall partitioning a plurality of discharge cells in a space between the plurality of discharge cells, a phosphor layer formed in the discharge cells, a bus electrode extending in a direction crossing the address electrode, and from each of the bus electrodes toward the center of each discharge cell. And a display electrode formed on the second substrate, the first electrode extending along the partition wall from the bus electrode on the partition wall, and connected to the first part. An ignition electrode comprising a second portion extending in a direction crossing the first portion, wherein each branch of each of the enlarged electrodes Wherein the bus electrode and parallel to a width measured in the direction is formed smaller than in the bus electrode edge in the center of the discharge cell edge.

Plasma Display Panel, Magnification Electrode, Ignition 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.

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

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

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

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel that can improve the discharge efficiency by improving the structure of the electrode.

In general, a plasma display panel (PDP) is a display device that realizes an image by using visible light generated by vacuum ultraviolet (VUV) radiation emitted from a plasma formed by gas discharge to excite a phosphor layer. 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 one substrate including a display electrode consisting of two electrodes and another substrate spaced apart from the substrate by a predetermined distance and including an address electrode. It is partitioned by a partition. A phosphor layer is formed inside the discharge cell, and discharge gas is injected. The display electrode has a stripe shape extending in a direction crossing the address electrode.

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

In more detail, the driving of the plasma display panel may be largely divided into a reset period, a scan period, and a discharge sustain period. The reset section is a section that makes the wall charges of all the discharge cells the same. The scan section is a section for selecting the discharge cells to be displayed. As the scan pulse voltage is sequentially applied to the scan electrodes, a discharge occurs between the address electrodes and wall charges are accumulated in the selected discharge cells. The discharge sustain period is a period for maintaining the discharge of the selected discharge cell in the scan period. When the discharge start voltage is alternately applied to the two display electrodes, wall charges formed in the selected discharge cell cause display discharge.

As described above, the plasma display panel goes through several steps from the input power to the final visible light. In each process, the energy conversion efficiency is not good. Therefore, the plasma display panel has low efficiency (ratio of luminance to power consumption) and power consumption. There is a redundant problem. At this time, since the discharge current flows in proportion to the area of the display electrode, the plasma display panel including the stripe-type display electrode has a problem in that the amount of discharge current increases and power consumption increases.

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 high efficiency plasma display panel which can reduce the discharge current and power consumption by improving the structure of the display electrode.

In order to solve the above problems, the plasma display panel includes a first substrate and a second substrate disposed to face each other, address electrodes formed side by side in one direction on the first substrate, and A partition wall partitioning a plurality of discharge cells in a space between the first substrate and the second substrate, a phosphor layer formed in the discharge cell, a bus electrode extending in a direction crossing the address electrode, and each of the bus electrodes A display electrode formed on the second substrate, the first electrode extending along the partition wall from the bus electrode and extending from the bus electrode to the center of each discharge cell; And an ignition electrode connected to the first portion and including a second portion extending in a direction crossing the first portion. And, each of the branches of each of the electrodes is enlarged by a width measured in a direction parallel with the bus electrode is formed smaller than in the bus electrode edge in the center of the discharge cell edge.

Each branch of each of the enlarged electrodes extends from the bus electrode, and an end portion of the center of the discharge cell may be branched to both sides. Each branch of the enlarged electrode may gradually decrease in width measured along a direction parallel to the bus electrode from the edge of the discharge cell to the edge of the bus electrode.

The bus electrode is formed so as to correspond to a pair in each of the discharge cells, and the branch of the enlarged electrode is formed so that at least two pairs of each of the discharge cells face each other, and the second portion of the ignition electrode is limited to each of the discharge cells. The pair may be formed to face each other.

The distance between the second portions of the facing ignition electrodes may be smaller than the distance between the facing enlarged electrodes in each discharge cell. The first portion of the ignition electrode extends longer than the enlarged electrode, so that the second portion of the ignition electrode may extend in parallel with the bus electrode between the facing enlarged electrodes.

A center edge of the discharge cell of each branch of the enlarged electrodes may be spaced apart from each other by 10 μm or more.

The partition wall partitions the discharge cell and the non-discharge area in a direction parallel to the address electrode, and the bus electrode may be formed along the partition wall on the partition wall.

The ignition electrode may be made of indium tin oxide (ITO).

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 embodiment of the present invention.

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. The phosphor layer 19 is formed inside the discharge cell 18 and discharge gas is injected.

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 various barrier rib structures such as a stripe-type barrier rib structure made of only a barrier member in parallel with the address electrode can be applied to the present invention, which is also within the scope of the present invention.

The phosphor layer 19 is formed inside the discharge cell 18 and a discharge gas (for example, a mixed gas of Xe and Ne) is injected to generate a predetermined discharge and light emission.

The display electrodes 21 and 22 are formed on the front substrate 20 surface facing the rear substrate 10 along the direction crossing the address electrode 12 (the x-axis direction in the drawing). The display electrodes 21 and 22 are composed of the scan electrode 21 and the sustain electrode 22, and each of the scan electrode 21 and the sustain electrode 22 extends along the direction crossing the address electrode 12. The electrodes 21b and 22b and the enlarged electrodes 21a and 22a extending from the bus electrodes 21b and 22b toward the center of the discharge cell 18 are included.

In this case, the enlarged electrodes 21a and 22a play a role of causing plasma discharge in the discharge cell 18 and are made of indium tin oxide (ITO), which is a transparent material, to secure the aperture ratio. The electrodes 21b and 22b may be made of an opaque metal material to compensate for the high resistance of the enlarged electrodes 21b and 22b and to secure electrical conductivity.

In this embodiment, the pair of bus electrodes 21b and 22b are formed to correspond to each other, and the enlarged electrodes 21a and 22a are divided into two or more branches for each discharge cell 18 in each of the pair of bus electrodes 21b and 22b. At least two pairs are formed to face each discharge cell 18.

In the present embodiment, each of the enlarged electrodes 21a and 22a is divided into at least two enlarged electrodes 21a and 22a spaced apart from each other, so that the area of the enlarged electrodes 21a and 22a positioned in each discharge cell is reduced. Can be reduced. Since the current flowing through the magnification electrodes 21a and 22a flows in proportion to the areas of the magnification electrodes 21a and 22a, the current consumption and power consumption can be reduced by reducing the area of the magnification electrodes 21a and 22a.

As the distance between each branch of the enlarged electrodes 21a and 22a in each discharge cell increases, the area of the enlarged electrodes 21a and 22a positioned in each discharge cell is reduced. In order to effectively reduce power consumption, each branch of each of the extension electrodes 21a and 22a may be formed with the center edges spaced apart from each other by 10 μm or more.

The ignition electrode 24 is connected to the bus electrodes 21b and 22b and formed. The ignition electrode 24 extends from the bus electrodes 21b and 22b over the first partition member 16a along the first partition member 16a and at the ends of the first part 24a. The second part 24b extends along the extending direction of the bus electrodes 21b and 22b (the x-axis direction in the drawing). The ignition electrode 24 may be made of indium tin oxide (ITO), which is a transparent material to secure the aperture ratio.

The second portion 24b of the ignition electrode is formed to face each discharge cell 18 a pair. The first portion 24a of the ignition electrode extends longer than the magnification electrodes 21a and 22a so that the second portion 24a of the ignition electrode is the bus electrodes 21b and 22b between the facing expansion electrodes 21a and 22a. ) Is formed extending in parallel with the direction (x-axis direction of the drawing). Accordingly, the distance between the second portions 24b of the ignition electrodes facing each other is smaller than the distance between the facing electrodes 21a and 22a facing each other within each discharge cell 18.

The first portion 24a of the ignition electrode is disposed above the partition 16 to limit the discharge current to extend the life of the electrode, and the second portion 24b of the ignition electrode is formed with a small discharge gap G1. It acts as an igniter.

The dielectric layer 26 and the MgO passivation layer 28 are sequentially formed on the front surface of the front substrate 20 while covering the display electrodes 21 and 22 and the ignition electrode 24. The MgO protective layer 28 protects the dielectric layer 26 from collision of ionized ions during plasma discharge, and has a high secondary electron emission coefficient to increase discharge efficiency.

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

Referring to FIG. 2, in the present embodiment, the branch of each of the enlarged electrodes 21a and 22a extends from the bus electrodes 21b and 22b toward the center of the discharge cell 18 and the ends of the center group of the discharge cells are branched to both sides. Iii) extending in parallel with the bus electrodes 21b and 22b. That is, the widths of the enlarged electrodes 21a and 22a are formed smaller at the edges of the bus electrodes 21b and 22b than at the edges of the center of the discharge cells 18.

That is, in the present embodiment, the area of the enlarged electrodes 21a and 22a in the vicinity of the partition wall 16 is reduced by reducing the edge widths of the enlarged electrodes 21a and 22a toward the bus electrodes 21b and 22b. The partition 16 absorbs an electric field, and the vicinity of the partition 16 is a small portion that contributes to discharge and luminance. Therefore, the current consumption and power consumption can be reduced by reducing the area of the enlarged electrodes 21a and 22a near the partition 16.

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 for creating wall charges in the discharge cells so that all discharge cells have a uniform discharge state. The scan section is a section for selecting a discharge cell to be displayed by applying a constant voltage to the scan electrode and the address electrode to generate an address discharge. The discharge sustain period is a period in which display discharge is generated in the discharge cells selected in the scan period by applying alternating voltages to the scan electrodes and the sustain electrodes.

In the present embodiment, the enlarged electrodes 21a and 22a are branched to reduce the current consumption, and the enlarged electrodes 21a and 22a are formed by the excited species generated by the ions ionized by the discharge colliding with the neutral particles. Smooth discharge may occur even in the part where) is not formed. Since the discharge also occurs in the forming portion of the enlarged electrodes 21a and 22a and the ignition electrode 24 and the portion between the electrodes, the discharge can occur in a wider area than the conventional one.

That is, the present embodiment has the advantage that the wall current of a wide area can be used by increasing the area where the discharge is substantially generated while limiting the current consumption by reducing the area of the enlarged electrode compared with the related art.

In the discharge holding section, the discharge is started in the short gap G1 (short gap) between the second portions 24b of the ignition electrodes facing each other. The discharge initiated in the second portion 24b of the ignition electrode is diffused into the enlarged electrodes 21a and 22a which are relatively long gaps G2. Therefore, the discharge starting voltage Vf can be reduced by the short gap G1 discharge, and the discharge efficiency can be improved by the long gap G2 discharge.

Hereinafter, the plasma display panel according to the second and third embodiments of the present invention will be described in detail. Each of the second and third embodiments has the same basic configuration as the first embodiment. In the second and third embodiments, the same components as in the first embodiment use the same reference numerals.

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

The display electrodes 31 and 32 are formed of the scan electrode 31 and the sustain electrode 32, and each of the scan electrode 31 and the sustain electrode 32 intersects the address electrode 12 (the x-axis in the drawing). Direction), and the bus electrodes 31b and 32b extending in the longitudinal direction, and the enlarged electrodes 31a and 32a extending toward the center of the discharge cell 18 from the bus electrodes 31b and 32b.

In this embodiment, the pair of bus electrodes 31b and 32b are formed to correspond to each other, and the enlarged electrodes 31a and 32a extend from each bus electrode 31b and 32b into at least two branches for each discharge cell 18. At least two pairs are formed facing each discharge cell 18.

In this embodiment, the current consumption and power consumption can be reduced by reducing the area of the expansion electrodes 31a and 32a located in each discharge cell. In this case, each branch of the enlarged electrodes 31a and 32a may be formed with a center edge spaced apart from each other by 10 μm or more to effectively reduce power consumption.

The width of each branch of each of the enlarged electrodes 31a and 32a gradually decreases from the edge of the center of the discharge cell 18 to the edge of the bus electrodes 31b and 32b. Accordingly, the current consumption and power consumption can be effectively reduced by reducing the area of the enlarged electrodes 31a and 32a near the partition 16.

In the present embodiment, the areas of the enlarged electrodes 31a and 32a are smaller than in the prior art, but the ions ionized by the discharge collide with the neutral particles and generate excitation species from the neutral particles, thereby causing the discharge in a wider area than the conventional one.

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

In the present embodiment, the partition wall 46 partitions the discharge cell 48 and the non-discharge area 49 in a direction parallel to the address electrode 12 (y-axis direction in the drawing). That is, the partition wall 46 is formed in the direction parallel to the address electrode 12 (the y-axis direction in the drawing) and the direction in which the first partition member 46a intersects with the first partition member 46a (x in the drawing). And a second partition wall member 46b formed along the axial direction).

In this embodiment, the direction in which the address electrode 12 intersects (the x-axis direction in the drawing) between the rows of discharge cells 48 formed along the direction in which the address electrode 12 intersects in the direction (x-axis direction in the figure). Accordingly, since the non-discharge regions 49 are disposed, the bus electrodes 21b and 22b made of an opaque material can be formed to pass over the second partition member 46b. Therefore, there is an advantage that the aperture ratio of the plasma display panel is improved.

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 embodiment of the present invention can reduce the current flowing through the enlarged electrode and reduce power consumption by reducing the area of the enlarged electrode positioned in each discharge cell. In addition, the area where discharge occurs substantially is increased compared to the conventional one, so that wall charges of a wide area can be used.

In the present invention, the current consumption and power consumption can be effectively reduced by reducing the area of the enlarged electrode located near the partition wall where the electric field is absorbed to contribute to the discharge and the luminance.

Then, the discharge is started in the short gap discharge between the ignition electrodes to reduce the discharge start voltage. The wall charges formed by the discharge initiated by the ignition electrode are diffused into the discharging region between the enlarged electrodes to ensure the stability of the display discharge, and the discharge efficiency can be improved by the long gap discharge.

Claims (9)

A first substrate and a second substrate disposed to face each other; Address electrodes formed on the first substrate in parallel with one direction; Barrier ribs defining a plurality of discharge cells in a space between the first substrate and the second substrate; A phosphor layer formed in the discharge cell; Display electrodes formed on the second substrate, the bus electrodes extending in a direction intersecting the address electrodes, and extending electrodes extending at least two or more from each bus electrode toward a center of each discharge cell; ; And An ignition electrode comprising a first portion extending from the bus electrode along the barrier rib on the barrier rib, and a second portion connected to the first portion and extending in a direction crossing the first portion; Including, Each branch of each of the enlarged electrodes has a width measured in a direction parallel to the bus electrode to be smaller at the edge of the bus electrode than at the edge of the center of the discharge cell, and the ends of the center of the discharge cell are branched to both sides. Iii) a plasma display panel. delete The method of claim 1, And each branch of the enlarged electrode gradually decreases in a width measured along a direction parallel to the bus electrode from the edge of the discharge cell to the edge of the bus electrode. The method of claim 1, The bus electrodes are formed to correspond to a pair in each of the discharge cells, and the branch of the enlarged electrode is formed such that at least two pairs of each of the discharge cells face each other. And a second portion of the ignition electrode is formed to face each of the discharge cells. The method of claim 4, wherein And a distance between the second portions of the facing ignition electrodes is smaller than the distance between the facing enlarged electrodes in each of the discharge cells. The method of claim 4, wherein And a first portion of the ignition electrode extends longer than the magnification electrode so that a second portion of the ignition electrode extends in parallel with the bus electrode between facing magnification electrodes. The method of claim 1, And a center edge of the discharge cell of each branch of the enlarged electrodes spaced apart from each other by 10 μm or more. The method of claim 1, The partition partitions the discharge cell and the non-discharge area alternately in a direction parallel to the address electrode, And the bus electrode is formed along the barrier rib on the barrier rib. The method of claim 1, And the ignition electrode is made of indium tin oxide (ITO).

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