KR100589341B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel which reduces discharge potential between an address electrode and a common electrode, increases discharge efficiency between an address electrode and a scan electrode, and increases reflection efficiency of an address electrode, thereby ensuring sufficient screen brightness.

The plasma display panel includes: first and second substrates; Address electrodes formed on the first substrate; A partition wall disposed in a space between the first substrate and the second substrate to define a plurality of discharge cells; A discharge sustaining electrode formed on the second substrate such that a pair is correspondingly disposed in each discharge cell, wherein the address electrode forms an extension having an enlarged line width in each discharge cell, The area of the non-facing part is made smaller than the area of the area defined by the product of the maximum width of the extension and the maximum gap between the pair of discharge sustaining electrodes.

Plasma, display, address electrode, extension, partition, discharge cell, discharge sustain electrode

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a partial cross-sectional view illustrating the coupling state of FIG. 1, and is a cross-sectional view taken along line I-I of FIG. 1.

3A, 3B, and 3C are partial plan views of the plasma display panel shown in FIG.

4 is a partial plan view of a plasma display panel shown for explaining a first modified example of the embodiment of the present invention.

5A and 5B are partial plan views of a plasma display panel shown for explaining a second modification to the embodiment of the present invention.

6, 7 and 8 are partial plan views of the plasma display panel shown for explaining the third, fourth and fifth modifications of the embodiment of the present invention, 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 in which the shape of the address electrode is improved in order to improve the discharge efficiency between the address electrode and the scan electrode and to secure excellent screen brightness.

In general, a plasma display panel (PDP, hereinafter referred to as 'PDP') is a display device that realizes a predetermined image by exciting a phosphor by vacuum ultraviolet rays caused by gas discharge occurring in a discharge cell. It is possible to configure a large screen and has been applied to a wall-mounted television.

The PDP is classified into a direct current (DC) type and an alternating current (AC) type according to a driving method. In recent years, an AC type PDP having a three-electrode surface discharge structure including an address electrode and a pair of sustain electrodes is mainly used.

When the PDP is classified according to the arrangement pattern of the unit pixels, the unit pixels in which independent gas discharge is performed, that is, stripe type (or inline type) in which R, G and B discharge cells are arranged in a stripe pattern, and a triangular pattern It can be distinguished by an array of deltas. Among the known delta PDPs, the arrangement of the R, G and B discharge cells is, for example, a rectangular closed partition wall disclosed in US Patent No. 5,182,489, and a hexagonal closure disclosed in Japanese Patent Laid-Open No. 6-44907. It can be made by the shape of the partition bulkhead, it can be made by the deformation structure of the linear bulkhead disclosed in US Patent Nos. 6,373,195 and 6,376,986.

Both the stripe type and the delta type PDP form an address electrode on a lower substrate corresponding to each discharge cell, and a discharge sustain electrode consisting of a scan electrode and a common electrode on an upper substrate.

Thus, when the address discharge is applied by applying the address voltage between the address electrode and the scan electrode in response to the selected discharge cell, and the sustain voltage is applied by applying the sustain voltage between the scan electrode and the common electrode, the vacuum ultraviolet rays generated during the sustain discharge are discharged. The fluorescent layer provided to the cell is excited to implement an arbitrary image with the visible light generated at this time.

On the other hand, in the delta PDP, the address electrode provided on the lower substrate may include an extension having an expanded line width corresponding to the shape of the discharge cell or the discharge sustain electrode. As a related technology, there is Japanese Patent Laid-Open No. Hei 6-44907.

In FIG. 1 of the preceding document, an address electrode having an extended portion having a line width enlarged corresponding to an internal space of a discharge cell is disclosed as a first embodiment, and in FIG. 6, a line width is enlarged corresponding to a scan electrode as a second embodiment. An address electrode having an extended portion is disclosed. The expansion part serves to increase the discharge efficiency between the two electrodes by expanding the opposing area between the address electrode and the scan electrode.

However, in the above-described first embodiment of the prior art document, the address electrodes are disposed to face each other in an area not contributing to the address discharge, that is, the gap region between the scan electrode and the common electrode and the common electrode with any area. Therefore, in the configuration of the first embodiment, an address voltage applied between the address electrode and the scan electrode may affect the common electrode through the extension, so that an unplanned discharge, that is, an erroneous discharge may occur between the address electrode and the common electrode.

On the other hand, the second embodiment configuration of the above-mentioned prior document can reduce the erroneous discharge between the address electrode and the common electrode by placing the extension only on the opposite surface to the scan electrode. However, considering that the conventional address electrode is made of a metal having high reflection efficiency and has a function of increasing the brightness of the screen by reflecting visible light generated in the discharge cell toward the upper substrate, the configuration of the second embodiment reduces the area of the extension part. This results in a significant loss of brightness.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to increase the discharge efficiency between the address electrode and the scan electrode, to reduce misdischarge between the address electrode and the common electrode, and to reduce the light reflection effect of the address electrode. The present invention provides a plasma display panel that can secure excellent screen brightness.

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

First and second substrates disposed 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 a plurality of discharge cells; A fluorescent layer provided in each discharge cell, and discharge holding electrodes formed on the second substrate such that a pair is correspondingly disposed in each discharge cell, wherein the address electrode has an extended line width in each discharge cell; The present invention provides a plasma display panel in which a portion is formed and an area of a portion of the expanded portion not facing the discharge sustaining electrode is smaller than the area of the region defined by the product of the maximum width of the extended portion and the maximum gap between the pair of discharge sustaining electrodes.

The extension part may form a pair of first openings formed by removing a part of the extension part at both ends of the extension part at a part not facing the discharge sustaining electrode. In addition, the extension part may form a second opening formed by removing a part of the extension part in the extension part at a part not facing the discharge sustaining electrode.

The address electrode further includes a line portion disposed under the partition wall, and the total width of the extension portion in the portion of the extension portion not facing the discharge sustaining electrode is equal to or larger than the width of the line portion.

The discharge sustaining electrode includes a bus electrode disposed long along one direction of the second substrate, and a transparent electrode extending from the bus electrode toward the center of each discharge cell and facing each other in the discharge cell. The maximum width of the extended portion of the address electrode is smaller than the width of the transparent electrode along the bus electrode direction.

The transparent electrode may form a recess in a center of opposing surfaces facing each other. In this case, the area of the portion of the extension portion that does not face the transparent electrode is the product of the maximum width of the extension and the minimum gap between the pair of transparent electrodes. It is made smaller than the area of the defined area. More specifically, the extension part is formed so as to form a second opening formed by removing a part of the extension part inside the extension part at a portion that does not face the transparent electrode, and the second opening part is formed to include a lower portion of the recess portion. Can be.

The discharge cells may be arranged in a triangle, and each of the discharge cells may have a rectangular shape. In this case, the extension portion of the address electrode may have a rectangular shape.

The discharge cells may be arranged in a triangle, and each of the discharge cells may have a hexagonal shape. In this case, the extension portion of the address electrode may have a hexagonal shape. At this time, the bus electrodes are arranged in a zigzag shape.

The discharge cells may be arranged in a lattice shape, and each of the discharge cells may have a quadrangular shape. In this case, the extension portion of the address electrode may have a quadrangular shape.

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 an exemplary embodiment of the present invention, and FIG. 2 is a partial cross-sectional view illustrating a coupling state of FIG. 1, and is a cross-sectional view taken along line I-I of FIG. 1.

Referring to the drawings, the plasma display panel of the present embodiment (hereinafter referred to as 'PDP') has a group of red (R), green (G), and blue (B) discharge cells 2R, 2G, and 2B arranged in a triangle. It consists of what is called a delta PDP which comprises a pixel.

Looking at the above configuration in detail, the PDP includes a first substrate 4 and a second substrate 6 constituting the vacuum container while being arranged in parallel at any interval. A partition wall 8 having a predetermined height is formed in an arbitrary pattern between the first substrate 4 and the second substrate 6 to partition pixels, where a set of pixels are three unit pixels arranged in a triangle. That is, the discharge cells 2R, 2G, and 2B are formed.

3A and 3B are partial plan views of the PDP shown in FIG. 1, wherein the configuration of the discharge cells 2R, 2G, 2B and the address electrode 10 is shown in FIG. 3A, and the discharge cells 2R, 2G, 2B are shown in FIG. 3B. ) And the discharge sustaining electrode 12 are shown.

1 to 3B, in the present embodiment, the shape of each of the discharge cells 2R, 2G, and 2B is substantially hexagonal, and the partition wall 8 and the discharge cells forming the discharge cells 2R, 2G, and 2B are formed. The discharge space of (2R, 2G, 2B) also has hexagonal shape as a whole. The discharge gas required for the PDP operation is provided in the internal spaces of the discharge cells 2R, 2G, and 2B, and the R, G, B discharge cells 2R, 2G, and 2B are provided with respective R, G, and B fluorescent layers 14R, 14G, 14B) are provided. Here, the fluorescent layers 14R, 14G, 14B are formed on both the bottom surface of the discharge space and the side surfaces of the partition wall 8.

In addition, the address electrodes 10 are formed on the first substrate 4 along one direction (Y direction in the drawing) of the first substrate 4, and cover the address electrodes 10 to cover the first substrate 4. The first dielectric layer 16 is formed on the entire inner surface. The address electrodes 10 are provided corresponding to the respective R, G, and B discharge cells 2R, 2G, and 2B and are positioned at random intervals from each other.

In this embodiment, the address electrode 10 has a width greater than that of the line portion 10a disposed under the partition wall along the Y-direction of the drawing, and disposed inside the discharge cells 2R, 2G, and 2B. It is made up of an extended portion 10b. At this time, the expansion portion 10b has the same shape as that of the discharge cells 2R, 2G, and 2B, that is, a hexagon.

On the other hand, one surface of the second substrate 6 facing the first substrate 4 is formed of the scan electrode 18 and the common electrode 20 along a direction crossing the address electrode 10 (the X direction in the drawing). Discharge sustaining electrodes 12 are formed. The discharge sustaining electrode 12 protrudes from the bus electrodes 18a and 20a formed along the partition 8 shape and from the bus electrodes 18a and 20a toward the center of each of the discharge cells 2R, 2G and 2B. It consists of the transparent electrodes 18b and 20b which a pair opposes inside discharge cell 2R, 2G, 2B.

The bus electrodes 18a and 20a are made of an opaque material such as metal, and are formed in a zigzag pattern along one direction of the second substrate 6 since they are disposed along the partition 8 shape. These bus electrodes 18a and 20a are disposed at positions corresponding to the partition wall 8 while minimizing the width thereof so as not to shield the visible light emitted from the discharge cells 2R, 2G and 2B during PDP driving.

In addition, on the second substrate 6, a transparent second dielectric layer 22 and an MgO passivation layer 24 are formed on the entire surface of the second substrate 6 while covering the discharge sustain electrodes 12.

Here, the PDP according to the present embodiment improves the shape of the extension portion 10b of the address electrode 10 to reduce the possibility of misdischarge between the address electrode 10 and the common electrode 20, while reducing the possibility of the address electrode 10 and the scan electrode. Provides a configuration to increase the discharge efficiency and the screen brightness between (18).

Referring to FIGS. 3A and 3B, the area 10b of the address electrode 10 has a maximum width W1 of the portion 10b of FIG. 3c that does not face the discharge sustain electrode 12. It consists of the structure formed smaller than the area of the area | region (represented by area | region A) defined by the product of the gap G between the scan electrode 18 and the common electrode 20. FIG.

To this end, in the present exemplary embodiment, a portion of the extension part 10b is removed at both ends of the extension part 10b at a part corresponding to the gap between the scan electrode 18 and the common electrode 20. The pair of first openings 10c may be formed to reduce the width of the central portion of the extension part 10b.

Here, the extension 10b is common with the first region B corresponding to the scan electrode 18, and the second region C corresponding to the gap between the scan electrode 18 and the common electrode 20. When divided into the third regions D corresponding to the electrodes 20, the widths d1 of the first and second regions B and C are transparent electrodes 18b and 20b along the bus electrodes 18a and 20a directions. The width d3 of the second region C is the same as or larger than the width d4 of the line portion 10a to secure the conductivity of the address electrode 10.

In addition, in the present embodiment, the address electrode 10 is made of a conductive material having high reflection efficiency such as silver (Ag).

Due to the above-described shape of the extended portion 10b, the address electrode 10 has an enlarged area facing the scan electrode 18 through the first region B of the extended portion 10b, thereby scanning the address electrode 10 and the scan. The discharge efficiency between the electrodes 18, that is, the address discharge efficiency can be increased.

The area of the portion of the address electrode 10 that does not face the discharge sustain electrode 12 is reduced through the second region C of the expansion part 10b, and thus, between the address electrode 10 and the scan electrode 18. The influence of the address voltage applied to the common electrode 20 through the extension 10b may be reduced. As a result, the PDP of this embodiment can reduce the possibility of erroneous discharge between the address electrode 10 and the common electrode 20.

In addition, as the second region C of the expansion unit 10b reduces the possibility of misdischarge between the address electrode 10 and the common electrode 20, the third portion of the expansion unit 10b corresponding to the common electrode 20 is reduced. The area D becomes an area which neither contributes nor hinders the address discharge.

The third region D of the extension part 10b serves as a reflective film during sustain discharge caused by a sustain voltage applied between the scan electrode 18 and the common electrode 20. That is, when the vacuum ultraviolet rays generated during the sustain discharge excite the fluorescent layers 14R, 14G, and 14B provided to the discharge cells 2R, 2G, and 2B to emit visible light, the expanded portion including the third region D ( 10b) the whole reflects visible light toward the second substrate 6 to serve as a brightness of the screen.

Therefore, the PDP of the present embodiment reduces the address driving voltage by increasing the discharge efficiency between the address electrode 10 and the scan electrode 18 while reducing the possibility of erroneous discharge between the address electrode 10 and the common electrode 20. ), It is expected to increase the reflection efficiency to secure sufficient screen brightness.

Next, modifications to the embodiment of the present invention will be described with reference to FIGS. 4 to 8.

FIG. 4 is a first modification, in which case the extension 26b at the portion where the extension 26b of the address electrode 26 does not oppose the discharge sustain electrode (see FIG. 3B) based on the structure of the above-described embodiment. The second opening 26c formed by removing a part of the extension part 26b is formed in the inside), thereby reducing the area of the extension part 26b.

In this modified example, one second opening 26c is provided in each of the extension portions 26b, and the shape of the second opening 26c has a long side along the bus electrode direction (X direction in the drawing) and an address electrode direction ( A rectangle having a short side along the Y direction of the drawing).

Here, the sum of the extension width d5 of the left side of the second opening 26c and the extension width d6 of the right side of the second opening 26c based on the drawing, that is, does not face the discharge sustaining electrode among the extensions. The total width d5 + d6 of the portion is equal to or larger than the width of the line portion 26a to secure the conductivity of the address electrode 26.

5A and 5B are second modifications. In this case, based on the structure of the first modification described above, a pair of transparent portions are formed by forming the recesses 28 at the centers of the opposite surfaces where the transparent electrodes 18b and 20b face each other. The electrodes 18b and 20b are positioned with the short gap G1 interposed therebetween to correspond to the edges of the discharge cells 2R, 2G and 2B, and the long gap G2 corresponding to the center of the discharge cells 2R, 2G and 2B. It is composed of a configuration placed between the).

As a result, in the PDP of the present modification, the plasma discharge is first started and diffused around from the short gap G1 corresponding to the edges of the discharge cells 2R, 2G and 2B during sustain discharge, and then the discharge cells 2R, 2G and 2B. As the plasma discharge starts and diffuses around from the long gap G2 corresponding to the center of the center, strong initial discharge occurs over a wider area in the discharge cells 2R, 2G and 2B, thereby improving the discharge efficiency.

At this time, the area of the portion of the address electrode 30 which does not face the discharge sustaining electrode 12 'in the area of the extension part 30a has a maximum width W2 of the extension part 30a and a pair of transparent electrodes 18b, It is made smaller than the region (denoted as region E) defined as the product of the minimum gap G1 between 20b). To this end, the second opening 30b provided in the expansion portion 30a may be formed in a hexagonal shape to include a lower portion of the recess 28.

FIG. 6 is a third modified example, in which the shape of each of the discharge cells 32R, 32G, 32B and the partitions 34 forming the discharge cells 32R, 32G, 32B are based on the structure of the above-described embodiment. The shape is made of squares. The extended portion 36a of the address electrode 36 also has the same shape as that of the discharge cells 32R, 32G, and 32B, that is, a quadrangle.

FIG. 7 shows a fourth modified example, in which the R, G, B discharge cells 38R, 38G, 38B are arranged in a stripe pattern, and the discharge cells 38R, 38G, 38B each have a rectangular shape, and thus the overall discharge. The shapes of the cells 38R, 38G, 38B are lattice. At this time, the expansion portion 40a of the address electrode 40 forms a pair of first openings 40b at both ends of the expansion portion 40a at portions not facing the discharge sustaining electrode 42 to form the expansion portion ( The center portion width of 40a) is reduced.

FIG. 8 is a fifth modification, in which case the extension 44a of the address electrode 44 is based on the structure of the fourth modification described above, and the expansion portion 44a is located at a portion not facing the discharge sustaining electrode 42. As shown in FIG. The second opening 44b formed by removing a portion of the expansion part 44a is formed in the inside thereof, thereby reducing the area of the expansion part 44a.

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 embodiment, the PDP of the present embodiment reduces the address driving voltage by increasing the discharge efficiency between the address electrode and the scan electrode while reducing the possibility of misdischarge between the address electrode and the common electrode. In addition, it is possible to secure sufficient screen brightness by increasing the reflection efficiency of the address electrode.

Claims (12)

First and second substrates opposed to 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 a plurality of discharge cells; A fluorescent layer provided in each of the discharge cells; And A discharge holding electrode formed on the second substrate such that a pair is correspondingly disposed on each discharge cell; And the address electrode forms an extension portion in which the line width is enlarged in each discharge cell, and an opening is formed therein in a portion where the extension portion does not face the discharge sustain electrode. delete delete The method of claim 1, And a line portion in which the address electrode is disposed under the partition wall, wherein the total width of the extension portion in a portion of the extension portion not facing the discharge sustaining electrode is equal to or larger than the width of the line portion. The method of claim 1, The discharge holding electrode, A bus electrode disposed to extend in one direction of the second substrate; And And a transparent electrode extending from the bus electrode toward the center of each discharge cell and facing each other in a pair of discharge cells. The method of claim 5, And a maximum width of the extended portion of the address electrode is smaller than a width of the transparent electrode in the bus electrode direction. The method of claim 5, A recess is formed in the center of the opposite surface where the transparent electrodes face each other, and the area of the portion of the extension portion not facing the transparent electrode is defined by the product of the maximum width of the extension and the minimum gap between the pair of transparent electrodes. A plasma display panel made smaller than the area. The method of claim 7, wherein And the opening of the address electrode includes a lower portion of the recess. The method of claim 1, And the discharge cells are arranged in a triangle, and each of the discharge cells is formed in a quadrangle, and an extension of the address electrode is formed in a quadrangle. The method of claim 1, And discharging the discharge cells in a triangle, wherein each of the discharge cells is formed in a hexagon, and an extension of the address electrode is formed in a hexagon. The method of claim 5 or 10, And the bus electrodes are arranged in a zigzag shape. The method of claim 1, And the discharge cells are arranged in a lattice shape, and each of the discharge cells is formed in a quadrangle, and an extension of the address electrode is formed in a quadrangle.

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