KR20080015226A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to suppress collapse between a front substrate and a barrier rib member due to thermal deformation. A second substrate(10) is positioned opposite to a first substrate. A barrier rib(16) is formed to define a space between the first substrate and the second substrate. A first electrode and a second electrode are positioned opposite to each other in the discharge cell in order to form a discharge gap. A first dielectric layer(14) is formed to cover the first electrode and the second electrode. An address electrode(12) is formed across the first electrode. A second dielectric layer is formed to cover the address electrode. A protruded part(31) is selectively formed at a part of the dielectric layer which comes in contact with the barrier rib.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a plan view illustrating an arrangement relationship between discharge cells and display electrodes of the plasma display panel illustrated in FIG. 1.

FIG. 3 is a partially exploded perspective view selectively showing a configuration of a partition wall and a dielectric layer for the portion 'A' of FIG. 2.

4 is a cross-sectional view taken along line IV-IV of FIG. 2.

5 is a plan view illustrating an arrangement relationship between discharge cells and display electrodes of a plasma display panel according to a second exemplary embodiment of the present invention.

FIG. 6 is a partially exploded perspective view selectively showing the configuration of the partition wall and the address electrode for the portion 'B' of FIG. 5.

7 is a cross-sectional view taken along the line VII-VII of FIG. 5.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter referred to as PDP) that improves a bright spot problem.

PDP is a display device that implements an image by using visible light generated by the ultraviolet radiation emitted from the plasma formed by the gas discharge excited the phosphor layer. Such PDPs have been spotlighted as next-generation flat panel displays because they can be composed of high resolution large screens.

A three-electrode surface discharge type PDP that is generally used at present, a scan electrode and a sustain electrode are formed on a front substrate, and an address electrode is formed on a rear substrate. The partition wall partitions the discharge cells along a portion where the scan electrodes and the address electrodes intersect.

Here, the partition wall is formed on the rear substrate, it is formed by causing the thermal deformation. That is, the partition wall is made by applying a sheet or paste to the back substrate, patterning it, and heating the sheet at a high temperature (about 500 ° C.) in a kiln. Therefore, the partition wall changes shape while causing thermal deformation.

For example, when the partition partitions discharge cells in the transverse direction and the longitudinal direction, respectively, the partition receives a stress that spreads out at a portion (hereinafter referred to as an intersection) that meets in the transverse direction and the longitudinal direction during firing. The stress generated in this way is largely generated at portions other than the intersection point, particularly in the portion which partitions the discharge cells in the longitudinal direction, so that the portion rises upward to form an arch shape after firing.

However, when the front wall and the rear substrate are combined in such a state that the partition wall is formed in an arch shape, the rising portion of the partition wall collides with the front board and the phosphor layer is damaged, and some phosphors scatter the discharge cells. Some of these scattered impurities are attached to the top plate, causing a problem of bright spots.

In addition, the TiO ₂ in the composition forming the partition has a relatively large particle size compared to other particles. This TiO ₂ is used to color the partitions to white. However, as nowadays come in developing a technique of coloring the partition walls with a dark color, in the coloring partition TiO ₂ is not used as a partition wall composition. As a result, the bulkhead compositions are relatively denser than before, resulting in more severe stresses generated during thermal deformation. As a result, as described above, there is a problem that the degree of deformation of the partition wall into an arch shape becomes more severe.

The present invention was devised to solve such a problem, and an object of the present invention is to prevent a partition from colliding with a substrate.

In order to achieve the above object, the plasma display panel provided in the present invention partitions a space between a first substrate, a second substrate facing the first substrate, and the first substrate and the second substrate to form a discharge cell. A barrier rib, a first electrode and a second electrode facing the discharge cell to form a discharge gap, a first dielectric layer covering the first electrode and the second electrode, an address electrode formed in a direction crossing the first electrode, and A second dielectric layer covering the address electrode, wherein the dielectric layer is selectively formed at a portion where the dielectric layer meets the barrier rib.

The protrusion may be formed by partially protruding the dielectric layer toward the partition wall.

In addition, the protrusion may be elongated in a direction crossing the address electrode.

The partition wall may include a first partition member that partitions the discharge cell in an extending direction of the address electrode, and a second partition member that partitions the discharge cell in a direction crossing the first partition wall member. .

The protrusion may be formed at a portion facing the second barrier member, and the height of the protrusion and the second barrier member is equal to the height of the first barrier member.

The dielectric layer has the thickest portion facing the second partition member.

In addition, the partition wall may be colored achromatic, preferably gray.

In the plasma display panel provided in the second embodiment of the present invention, a discharge cell is formed by partitioning a space between a first substrate, a second substrate facing the first substrate, and a space between the first substrate and the second substrate. A partition wall, a first electrode and a second electrode facing the discharge cell to form a discharge gap, a first dielectric layer covering the first electrode and the second electrode, an address electrode formed in a direction crossing the first electrode, and the address And a second dielectric layer covering the electrode, wherein the address electrode is selectively formed at a portion facing the partition wall.

Here, the protrusion is formed by the address electrode partially protruding toward the partition wall.

The dielectric layer covers the address electrode with a uniform thickness.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is an exploded perspective view of a portion of a plasma display panel (hereinafter referred to as PDP) according to a first embodiment of the present invention.

In the PDP of this embodiment, the first substrate (hereinafter referred to as the front substrate) 20 and the second substrate (hereinafter referred to as the back substrate) 10 are arranged to face each other, and the partition wall 16 partitions the space therebetween and discharges them. Cells 18 are formed. The discharge cells 18 form a sub pixel, which is a minimum unit for displaying an image, and a plurality of sub pixels form one pixel.

Each of the discharge cells 18 and the display electrode 25 and the address of the first electrode (hereinafter referred to as the scan electrode) 21 and the second electrode (hereinafter referred to as the sustain electrode) 23 which face each other to form a discharge gap are described. An electrode 12 is formed. The display electrode 25 and the address electrode 12 are spaced apart from each other and extend in the direction crossing each other, and each discharge cell 18 is positioned at the point where the scan electrode 21 and the address electrode 12 cross each other.

The front substrate 20 is formed of a transparent material such as tempered glass through which light passes. On the front substrate, an image formed by the discharge of the discharge cells 18 is displayed.

Then, the display electrode 25 is formed corresponding to each discharge cell 18. The display electrode 25 may be formed as a pair of the scan electrode 21 and the sustain electrode 23, and the scan electrode 21 and the sustain electrode 23 face the plane of the discharge cell 18 to form a discharge gap ( g) (see FIG. 2). Here, the scan electrode 21 selects a discharge cell 18 that is turned on by working with the address electrode 12, and the sustain electrode 23 is held for the selected discharge cell 18 by working with the scan electrode 21. A discharge is formed during the period.

The display electrode 25 is embedded and protected by a dielectric layer 28 formed of a dielectric (for example, PbO, B ₂ O ₃ , SiO ₂ ). The dielectric layer 28 prevents damage to the display electrode 25 due to collision of charged particles during discharge.

In addition, the dielectric layer 28 may be covered with a protective film (eg, MgO). The protective film 29 prevents the charged particles from directly colliding with the dielectric layer 28 during the discharge to damage the dielectric layer 28, and when the charged particles collide, the secondary electrons are released to increase discharge efficiency.

In addition, an address electrode 12 may be formed on the rear substrate 10 facing the front substrate 20. As shown, the address electrode 12 crosses the display electrode 25 and extends in one direction (y-axis direction in the drawing) corresponding to each discharge cell 18, and is adjacent to the neighboring address electrode 12. It is formed side by side. Therefore, when the entire back substrate 10 is viewed, the entire address electrode 12 has a stripe shape. The address electrode 12 selects a discharge cell 18 that is turned on by working with the scan electrode 21.

The address electrode 12 is embedded and protected by the dielectric layer 14, and therewith along the horizontal partition member 16a and the horizontal partition member 16a which partition the discharge cell 18 in the x-axis direction of the drawing. The partition wall 16 including the vertical partition member 16b partitioning the discharge cell 18 in the y-axis direction is formed to partition the discharge cell 18. The partition 16 thus constructed is preferably colored achromatic.

On the other hand, the protrusion 31 is further formed as the dielectric layer 14 in contact with the horizontal partition member 16a. The protrusions 31 selectively increase the height of the horizontal partition member 16a compared with the vertical partition member 16b, so that the height of the vertical partition member 16b with the horizontal partition member 16a is increased even though the height of the vertical partition member 16b increases due to thermal deformation. It works to reduce the height difference.

In the discharge cell 18, a phosphor layer 19 emitting color visible light is formed. The phosphor layer 19 is formed by applying a phosphor to the wall surface and the bottom surface of the partition wall 16 partitioning the discharge cells 18.

In addition, the phosphor layer 19 is formed in discharge cells for each of red (R), green (G), and blue (B) to display an image, and red discharge cells 18R, green discharge cells 18G, and blue discharges are formed. The cells 18B form one pixel in a set.

As described above, the discharge cells 18 in which the phosphor layer 19 is formed are filled with a mixed discharge gas such as neon and xenon.

FIG. 2 is a plan view illustrating an arrangement relationship between a discharge cell and a display electrode of the PDP shown in FIG. 1.

The partition wall 16 is a horizontal partition member 16a that extends in a first direction (x-axis direction in the drawing) crossing the address electrode 12 and a second direction (y-axis in the drawing) crossing the first direction. Direction, the longitudinal bulkhead member 16b extending in the lengthwise direction of the address electrode).

Therefore, the discharge cells 18 are partitioned by the horizontal partition member 16a in the x-axis direction and partitioned by the vertical partition member 16b in the y-axis direction to form a matrix arrangement as a whole. At this time, the discharge cells of the same color are arranged in a column (y-axis direction of the drawing), the discharge cells of different colors are located in the row direction (x-axis direction of the drawing) in order. Therefore, the discharge cells of different colors positioned in the row direction, that is, the red discharge cells 18R, the green discharge cells 18G, and the blue discharge cells 18B form one set to form one pixel. As a result, each of the discharge cells 18 is partitioned so that the column direction (y-axis direction in the figure) is longer than the row direction (x-axis direction in the figure).

The scan electrode 21 and the sustain electrode 23 of the display electrode 25 face the discharge cell 18 to form a discharge gap g.

The scan electrode 21 and the sustain electrode 23 extend long while maintaining a constant distance g from each other in the first direction. In this case, the scan electrode 21 and the sustain electrode 23 are formed in a thin film on the opposite surface 201 of the front substrate 20 facing the rear substrate 10, and the belt-shaped transparent electrodes 211 and 231 are formed. It may be formed by including the band-shaped bus electrodes 213 and 233 formed on the transparent electrodes 211 and 231. With this configuration, the display electrode 25 is located on the upper surface of the discharge cell 18 (see FIG. 4).

Here, the bus electrodes 213 and 233 are made of a metal having good conductivity such as copper (Cu) and silver (Ag), and the transparent electrodes 211 and 231 are made of a transparent material such as ITO, and the upper surface of the discharge cell. It is made not to obscure. In addition, the bus electrodes 213 and 233 and the transparent electrodes 211 and 231 are formed in a thin film on the opposite surface 201 of the front substrate 20 so that each discharge cell 18 is combined with the back substrate 10. It is disposed corresponding to the upper surface of the).

Meanwhile, as illustrated in FIG. 3, the horizontal barrier rib member 16a is formed on the protrusion 31 of the dielectric layer 14. 3 is a partially exploded perspective view selectively showing the portion 'A' of FIG. 2 in order to explain the configuration relationship between the partition wall and the dielectric layer.

In the first embodiment, the protrusions 31 are formed with the dielectric layer 14 partially protruding. That is, the protrusion 31 has a shape in which the portion of the dielectric layer 14 which meets the horizontal partition member 16a protrudes toward the partition 16.

Then, the horizontal partition wall member 16a is formed above this protrusion 31. Therefore, before the partition 16 is thermally deformed, the horizontal partition member 16a becomes higher than the vertical partition member 16b.

However, when the partition 16 causes thermal deformation, the vertical partition member 16b has a longer length for partitioning the discharge cells than the horizontal partition member 16a, and furthermore, the horizontal partition member 16a and the vertical partition member. Deformation occurs more severely at portions other than the intersection portion 16b meets, causing deformation between the intersection portions of the vertical bulkhead members 16b. At this time, the partition 16 is fixed on the lower surface to the dielectric layer 14, but because the upper surface is a free end, the deformation occurs toward the upper surface and causes the partition 16 to rise toward the front substrate 20.

On the other hand, the horizontal bulkhead member 16a has a smaller height than the vertical bulkhead member 16b due to less stress than the vertical bulkhead member 16b in the heat deformation process. As a result, the heights of the horizontal partition member 16a and the vertical partition member 16b become the same after the heat deformation has occurred. In other words, the sum of the heights h1 and h2 of the horizontal partition wall member 16a and the protrusion 31 is equal to the height h3 of the vertical partition wall member 16b (see FIG. 4).

On the other hand, the dielectric layer 14 is formed with a uniform thickness t1 over the entire back substrate, and the protrusions 31 are formed with a thickness t2 thicker than this thickness t1. Thus, the dielectric layer 14 is formed thickest in the protrusion 31.

Hereinafter, with reference to FIG. 4, the cross-sectional structure of the discharge cell will be described in detail. 4 is a cross-sectional view taken along line IV-IV of FIG. 2.

In FIG. 4, the display electrode 25 is formed on the opposing surface 201 of the front substrate 20. The display electrode 25 is covered with a dielectric layer 28 made of a dielectric material and embedded and protected. The dielectric layer 28 is formed by depositing a dielectric (PbO, B ₂ O ₃ , SiO _2, etc.) on the opposite surface 201 of the front substrate 20, and blocks the visible light formed by the gas discharge of the discharge cell It is made transparent so as not to.

An address electrode 12 is formed on an opposite surface of the back substrate 10, and extends in a direction crossing the display electrode 25. The address electrode 12 is covered with a dielectric layer 14 made of a dielectric material, embedded and protected.

The partition wall 16 is formed at a predetermined height toward the front substrate 20 above the dielectric layer 14. The partition wall 16 divides the space between the front substrate 20 and the rear substrate 10 to form a discharge cell 18.

In the first embodiment, the partition 16 is colored achromatic in order to enhance the image display performance of the PDP. In the drawing, dotted lines illustrate light incident from the outside of the PDP (hereinafter, referred to as external light). As shown, some of the external light is incident toward the partition 16. The achromatic colored partition 16, as in the present embodiment, does not reflect the external light, but rather absorbs it, thereby reducing the reflection of external light to display the image. Will improve.

The partition 16 is preferably colored grey. In order to absorb external light and improve the quality of the PDP, black is preferable. However, since black absorbs all of the light emitted from the discharge cell 18 without reflecting it, a problem of lowering the luminance occurs. In view of this point, in the present embodiment, the partition 16 is colored in gray.

5 is a plan view illustrating an arrangement relationship between a discharge cell and a display electrode of a PDP according to a second embodiment of the present invention. Compared to the first embodiment, the same reference numerals are used for the same components, and detailed description thereof will be omitted.

In the second embodiment, the discharge cells 48R, 48G, 48B are partitioned by the horizontal partition member 16a and the vertical partition member 16b formed over the protrusion 41a of the address electrode 41.

The address electrodes 41 extend in the extending direction (y-axis direction in the drawing) of the vertical partition wall member 16b and are arranged in parallel with each other. Therefore, when viewed as a whole, the address electrodes 41 form a stripe arrangement.

On the other hand, the horizontal partition member 16a is formed to intersect with the address electrode 41 to partition the discharge cell 48.

As illustrated in FIG. 6, the address electrode 41 forms a protrusion 41a along a portion that intersects the horizontal partition member 16a. The protrusion 41a may be formed by protruding a part of the address electrode 41 toward the partition wall 16.

The address electrode 41 having the protrusion 41a is covered with a dielectric, and the bottom surface forms the dielectric layer 14.

The dielectric layer 14 is formed to have a uniform thickness t4 over the entire back substrate 10. As a result, a portion where the projection 41a of the address electrode 41 is formed is partially formed to protrude toward the front substrate 20 (see FIG. 7).

Accordingly, the horizontal bulkhead member 16a formed over the protrusion 41a has a shape that partially protrudes toward the front substrate 20, and the horizontal bulkhead member 16a is formed highest in this portion.

On the other hand, the vertical partition member 16b is formed to protrude toward the front substrate 20 while causing thermal deformation. As a result, the horizontal partition member 16a and the vertical partition member 16b are formed at substantially the same height.

In the second embodiment, the partition wall 16 is colored achromatic as in the first embodiment, and preferably colored grey.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

As described above, according to the protruding portion and the protruding portion of the present invention, the horizontal bulkhead member also increases as the vertical bulkhead member increases while causing thermal deformation, thereby preventing the bulkhead from colliding with the front substrate. In particular, the present invention can be very usefully used when coloring partition walls.

Claims (16)

First substrate, A second substrate facing the first substrate, A partition wall partitioning a space between the first substrate and the second substrate to form a discharge cell, A first electrode and a second electrode facing the discharge cell to form a discharge gap; A first dielectric layer covering the first electrode and the second electrode, An address electrode formed in a direction crossing the first electrode, A second dielectric layer covering the address electrode Including, The dielectric layer may have a protrusion formed selectively at a portion where the dielectric layer meets the barrier rib. The method of claim 1, And the protrusion is formed by the dielectric layer partially protruding toward the partition wall. The method of claim 1, And the protrusion is elongated in a direction crossing the address electrode. The method of claim 1, And the partition wall includes a first partition member that partitions the discharge cell in an extending direction of the address electrode, and a second partition wall member that partitions the discharge cell in a direction crossing the first partition member. The method of claim 4, wherein And the protrusion is formed at a portion facing the second partition member. The method of claim 5, The height of the sum of the protrusions and the second partition wall member is the same as the height of the first partition wall member. The method of claim 4, wherein And wherein the dielectric layer has the thickest portion facing the second partition member. The method according to any one of claims 1 to 7, And the partition wall is colored achromatic. The method of claim 8, And the barrier rib is colored in gray. First substrate, A second substrate facing the first substrate, A partition wall partitioning a space between the first substrate and the second substrate to form a discharge cell, A first electrode and a second electrode facing the discharge cell to form a discharge gap; A first dielectric layer covering the first electrode and the second electrode, An address electrode formed in a direction crossing the first electrode, A second dielectric layer covering the address electrode Including, And the protrusion electrode is selectively formed at a portion of the address electrode facing the barrier rib. The method of claim 10, And the protrusion is formed such that the address electrode partially protrudes toward the barrier rib. The method of claim 10, And the partition wall includes a first partition member that partitions the discharge cell in an extending direction of the address electrode, and a second partition wall member that partitions the discharge cell in a direction crossing the first partition member. The method of claim 12, And the protrusion is formed at a portion facing the second partition member. The method of claim 10, The dielectric layer has a uniform thickness and covers the address electrode. The method according to any one of claims 10 to 14, And the partition wall is colored achromatic. The method of claim 15, And the barrier rib is colored in gray.

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