KR20080040163A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance a blackening rate and to reduce reflection of external light by painting a front substrate and a bus electrode with complementary colors. A front substrate(15) is arranged at a constant interval from a rear substrate(10) and is colored with a first color. An address electrode(11) is extended in a first direction on the rear substrate. A display electrode(16) is formed in a second direction crossing the first direction on the front substrate. A barrier rib(13) is arranged in a space between the front substrate and the rear substrate in order to define discharge cells. A phosphor layer(14) is formed within each of the phosphor cells. The display electrode includes a bus electrode which is colored with a second color.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.

3 is a plan view schematically illustrating an image display area of a plasma display panel according to a first embodiment of the present invention.

4 is a cross-sectional view of a plasma display panel according to a second embodiment of the present invention.

5 is a plan view schematically illustrating an image display area of a plasma display panel according to a second embodiment of the present invention.

6 is a 20-color redemption table for explaining the complementary color relationship.

<Description of the symbols for the main parts of the drawings>

10: back substrate 11: address electrode

12: back dielectric layer 13: bulkhead

13a: horizontal partition member 13b: vertical partition member

14: phosphor layer 15: front substrate

16: display electrode 162: sustain electrode

161: scanning electrode 161a, 162a: bus electrode

162a and 162b: transparent electrode 17 and front dielectric layer

18: protective layer 19: discharge cell

30: image display area 30a: first area

30b: second region 30c: third region

30d: fourth region 40: coloring table

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 black layer ratio and clear room contrast are improved by coloring different layers in the panel's internal structure so as to be complementary to each other.

The plasma display panel forms a plasma through a discharge phenomenon. Ultraviolet (UV) light emitted from the plasma excites the phosphor layer, and an image is realized by using visible light of red (R), green (G), and blue (B) colors generated in the phosphor layer.

The plasma display panel can easily realize a large screen, and because it is a self-luminous display device such as a cathode ray tube (CRT), not only has good color reproducibility but also has a large field of view and excellent image display ability. In addition, the plasma display panel has advantages in terms of productivity and cost since its manufacturing method is simpler than liquid crystal display (LCD).

The plasma display panel may be classified into a direct current type (DC) and an alternating current type (AC) according to its discharge type. The DC plasma display panel has a structure in which electrodes are exposed to a discharge space, and charges are directly transferred between corresponding electrodes.

In an AC plasma display panel, an electrode is covered with a dielectric layer, and discharge is performed by wall charge. In recent years, AC plasma display panels have become mainstream.

In addition, the plasma display panel may be classified into a facing discharge type and a surface discharge type according to the arrangement of the electrodes. On the other hand, the opposite discharge type plasma display panel has a structure in which paired display electrodes are provided on the front substrate and the rear substrate, respectively, and discharges are formed in the direction of the rear substrate from the front substrate. The surface discharge plasma display panel has a structure in which paired display electrodes are arranged on the same substrate, and discharge is formed on one plane of the substrate.

While the above-mentioned counter-discharge type plasma display panel has a high luminous efficiency, the phosphor layer is easily degraded by the plasma. Therefore, in recent years, surface discharge type plasma display panels have become mainstream.

In a plasma display panel having a general AC surface discharge structure, an address electrode is formed on a rear substrate, and a dielectric layer covers the address electrode. In addition, the barrier rib is formed on the dielectric layer in a stripe form to form a discharge cell, and a phosphor layer is formed on an inner surface of the discharge cell. The phosphor layer emits visible light of red (R), green (G), and blue (B) colors.

Such a plasma display panel selects a discharge cell by using the storage characteristics of wall charges, generates a discharge in the selected discharge cell, and combines them properly to implement an image.

Particularly, in an external bright condition, that is, a bright room condition, external light is incident to the inside of the panel and overlaps with light generated in the discharge cell. As a result, the bright room contrast is lowered and the image display capability of the plasma display panel is lowered.

Meanwhile, various attempts have been made to improve the image display capability of the aforementioned plasma display panel. There are a method of increasing contrast by increasing the black ratio, a method of improving contrast by reducing reflection luminance, and a method of improving the luminance of a panel by increasing luminous efficiency.

The conventional bus electrode is formed of a black layer and a white layer, and in particular, the black layer easily absorbs light emitted from the outside, thereby reducing the reflection brightness of the plasma display panel, thereby improving the clear room contrast.

The process of forming a black layer and a white layer is as follows. A black paste is applied to a lower surface of the front substrate to a predetermined thickness and dried to form a black layer. Next, a white paste is applied to a predetermined thickness on the black layer and dried to form a white layer. Next, the mask is exposed using a mask according to a desired pattern, and then the unexposed portions are removed using a developer, and a bus electrode is formed through a drying and baking process.

As described above, the process of forming the black layer and the white layer is complicated. In addition, since the black layer and the white layer are different materials from each other, since the intrinsic specificity is different, there are various problems in forming.

In particular, when exposing the white layer and the black layer using a mask, a part of the black layer formed inside is not exposed to the irradiated light. Therefore, this part is removed by the developer, and undercut phenomenon eventually occurs.

When the undercut phenomenon occurs, the width of the black layer is narrowed and, in severe cases, the black layer is separated from the bus electrode, and thus the bus electrode cannot supply power properly.

In addition, due to the difference in shrinkage between the black layer and the white layer during the drying and firing process, the edge curl of the white layer is raised as edges thereof rise. That is, the black layer and the white layer are deformed differently from the originally intended shape.

When the edge curl phenomenon occurs, the charge is concentrated in the end portion of the white layer to form an abnormal discharge. In particular, when bubbles are formed in the area, the dielectric layer adjacent thereto is destroyed, and the size thereof increases with time, resulting in screen defects.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a plasma display panel which can prevent undercut and edge curl by forming a bus electrode as a single layer.

Another object of the present invention is to provide a plasma display panel in which the bus electrode and the front substrate are colored in complementary colors with each other to improve black ratio and clear room contrast without any additional configuration.

Plasma display panel according to an embodiment of the present invention, the rear substrate, the rear substrate is disposed opposite to the rear substrate, the front substrate colored in a first color, the address electrode formed to extend in the first direction on the rear substrate, the A display electrode formed on a front substrate in a second direction crossing the first direction, a partition wall disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells, and a phosphor layer formed in the discharge cells; The display electrode may include a bus electrode colored with a second color that is in a blue color mixing relationship with the first color.

In the plasma display panel according to the embodiment of the present invention, it is preferable that the first color colored on the front substrate and the second color colored on the bus electrode are complementary to each other. In addition, the bus electrode is preferably formed of a metal material. In addition, the front substrate is a plasma display panel which is colored in an orange series.

In addition, in the plasma display panel according to the embodiment of the present invention, the front substrate preferably includes a material selected from the group consisting of Cu, Sb, and Cr. In addition, the bus electrode is preferably colored blue. In addition, the bus electrode preferably includes a material selected from the group consisting of Mn, Ni, and Co.

In addition, in the plasma display panel according to the embodiment of the present invention, it is preferable that the bus electrode is colored in an orange series. In addition, the front substrate is preferably colored blue. In addition, the bus electrode is preferably formed of a single layer.

In addition, in the plasma display panel according to the exemplary embodiment of the present invention, a color band is formed at a portion corresponding to a boundary of neighboring discharge cells in the first direction, and the color band is in a color-mixing relationship with the first color. It is preferred to be colored in color. In addition, it is preferable that the first color colored on the front substrate and the third color colored on the color table are complementary to each other.

In addition, in the plasma display panel according to the embodiment of the present invention, it is preferable that the coloring band is colored in an orange series. In addition, the color band is preferably colored blue. In addition, the coloring table is preferably formed at the same time as the bus electrode.

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 may 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.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

Hereinafter, a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partially exploded perspective view of a plasma display panel according to a first exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.

As shown, the plasma display panel includes discharge cells 19 partitioned by the partition 13 between the back substrate 10 and the front substrate 15 and address electrodes formed to correspond to the discharge cells 19. And the display electrode 16.

The rear substrate 10 and the front substrate 15 face each other at a predetermined interval. An address electrode 11 extending in a first direction (y-axis direction in the drawing) is formed on an upper surface of the rear substrate 10, and the address electrodes 11 are formed to be parallel to each other with a predetermined distance from the neighboring ones. In addition, a back dielectric layer 12 is formed on an upper surface of the back substrate 10, and the back dielectric layer 12 covers the address electrode 11.

A display electrode 16 extending in a second direction (x-axis direction in the drawing) is formed on the lower surface of the front substrate 15, and the display electrodes 16 are formed side by side with a predetermined distance from the neighboring ones. The display electrode 16 includes a scan electrode 161 and a sustain electrode 162 corresponding to each discharge cell 19. Each of the scan electrode 161 and the sustain electrode 162 is a bus electrode 161a, 162a and transparent electrodes 161b and 162b. In addition, the sustain electrode 162 and the scan electrode 161 are spaced apart by a predetermined distance to form a discharge gap so as to correspond to each discharge cell 19.

Meanwhile, the sustain electrode 162 and the scan electrode 161 include transparent electrodes 161b and 162b in consideration of transmittance and the like. Each of the transparent electrodes 161b and 162b has high electrical resistance and thus has high conductivity. Not good. On the other hand, the bus electrodes 161a and 162a are made of a metal material such as Ag, which has good conductivity, so that voltage can be easily applied to the transparent electrode.

The front substrate 15 according to the present exemplary embodiment is colored in a first color, and the bus electrodes 161a and 162a are colored in a second color, and the first and second colors to be colored are dark-mixed with each other. Therefore, when the first color of the front substrate 15 and the second color of the bus electrodes 161a and 162a overlap, the brightness becomes low and dark. In particular, when the first color and the second color have a complementary color relationship, the mixed color may be black or an achromatic color close to black.

The dark color absorbs light from the outside, thereby reducing the luminance of reflection of the plasma display panel, and increasing the black ratio to increase the clear room contrast. In this embodiment, the bus electrodes 161a and 162a are formed in a single layer.

As the bus electrodes 161a and 162a are formed of a single layer of the same material, the process is simplified. In addition, when the exposure is performed to form the bus electrodes 161a and 162a, the processing becomes uniform, and development is uniformly performed by the developer, so that less undercut phenomenon occurs. In addition, since the bus electrodes 161a and 162a are not formed of different materials, edge curl occurs less during the drying and firing process.

The color of the front substrate 15 and the types of colors of the bus electrodes 161a and 162a and their relationship will be described in detail with reference to FIG. 6.

A front dielectric layer 17 is formed on a lower surface of the front substrate 15, and the front dielectric layer 17 covers the display electrode 16. The front dielectric layer 17 protects the display electrode 16 from discharge and accumulates wall charges.

The front dielectric layer 17 is covered with a protective layer 18. The protective layer 18 is a transparent material that not only easily transmits visible light emitted from the phosphor layer 14 but also protects the front dielectric layer 17 from discharge. In addition, the protective layer 18 increases the secondary electron emission coefficient to lower the discharge start voltage so that discharge occurs easily.

A partition 13 is formed between the protective layer 18 and the back dielectric layer 12. The partition 13 includes a horizontal partition member 13a and a vertical partition member 13b.

The horizontal partition member 13a is formed long in the second direction (x-axis direction in the drawing), and the vertical partition member 13b is formed long in the first direction (y-axis direction in the drawing). In addition, the vertical partition member 13b and the horizontal partition member 13a cross each other. In the present embodiment, the horizontal partition wall member 13a and the vertical partition wall member 13b partition the discharge cells 19 in a grid form.

Naturally, the discharge cells 19 according to the embodiment of the present invention may be formed in various shapes such as a stripe or a delta. The partition 13 of this type prevents crosstalk between the discharge cells 19 and provides a surface on which the phosphor layer 14 is applied.

The discharge cell 19 is filled with a discharge gas which is an inert gas (for example, a mixed gas of Ne and Xe). The discharge gas causes the discharge to occur easily between the sustain electrode 162 and the scan electrode 161. The vacuum ultraviolet radiation emitted by the discharge excites the phosphor layer 14 applied in the discharge cell to emit visible light, and the visible light is combined to realize an image.

3 is a plan view schematically illustrating an image display area of a plasma display panel according to a first embodiment of the present invention. For convenience, only a part of the partition, the display electrode, and the front substrate are illustrated.

As shown in FIG. 3, the plasma display panel has an image display area 30 for displaying an image while the visible light generated in the discharge cell 19 is emitted to the outside. In FIG. 3, the image display area 30 shows only a part of the entire area.

The image display area 30 may be divided into a first area 30a, a second area 30b, and a third area 30c. The first area 30a is an area where the phosphor layer 14 is visible through the front substrate 15, and the second area 30b is an area where the partition wall 13 is visible through the front substrate 15, and the third area is 30c is an area where the bus electrodes 161a and 162a are visible through the front substrate 15.

In the present embodiment, the front substrate 15 is colored in a first color, the bus electrodes 161a and 162a are colored in a second color, and the first color and the second color are in a navy color mixing relationship with each other. For example, when the front substrate 15 is colored in blue, and the bus electrodes 161a and 162a are colored in orange, these colors are in a dark color mixing relationship, in particular, a complementary color relationship, and thus the third region 30c is black. Or it will have a color close to black. As a result, the black ratio of the plasma display panel is increased, whereby the bright room contrast can be improved and the reflection brightness is reduced.

As another example, even if the front substrate 15 is colored in an orange color and the bus electrodes 161a and 162a are colored in a blue color, the third region 30c may have a color black or close to black. The type of color and its characteristics will be described later in FIG. 6.

In the embodiment of the present invention, in order for the color of the front substrate and the color of the bus electrode to be complementary to each other, it is preferable to add a coloring material to them _. Such coloring materials may be coated on the surface or mixed into the raw materials.

A material selected from Mn, Ni, and Co may be added to the front substrate 15 or the bus electrodes 161a and 162a to have a blue color, or may be coated on the surface. 15) Alternatively, a material selected from Cu, Sb, and Cr may be added to the bus electrodes 161a and 162a or coated on the surface.

4 is a cross-sectional view of a plasma display panel according to a second embodiment of the present invention.

Parts that are the same as or similar to those of the first embodiment will be denoted by the same reference numerals and will not be repeated.

In the present exemplary embodiment, the colored table 40 is formed on the upper side of the partition 13 between the adjacent display electrodes 16. The coloring table 40 is formed along the lower surface of the front substrate 15, and is colored in a second color like the bus electrodes 161a and 162a to have a color-mixing relationship with the color of the front substrate 15.

Therefore, when the color of the coloration table 40 and the color of the front substrate 15 overlap, it has a dark color close to black or black. Such a black color or a dark color close to black absorbs light incident from the outside, thereby reducing the luminance of reflection of the plasma display panel, increasing black ratio, and increasing contrast of bright room.

5 is a plan view schematically illustrating an image display area of a plasma display panel according to a second embodiment of the present invention.

As shown in FIG. 5, the discharge cell 19 is partitioned by the partition 13, and the coloring table 40 is formed in the upper surface along the horizontal partition member 13a especially.

As shown, the plasma display panel has an image display area 30. For convenience of description, the image display area 30 shows only a part of the entire area.

The image display area 30 may be divided into a first area 30a, a second area 30b, a third area 30c, and a fourth area 30d. The first area 30a is an area where the phosphor layer 14 is visible through the front substrate 15, and the second area 30b is an area where the partition wall 13 is visible through the front substrate 15, and the third area is Reference numeral 30c denotes an area where bus electrodes 161a and 162a are visible through the front substrate 15, and fourth region 30d is an area where the coloring table 40 is visible through the front substrate 15.

In the present embodiment, the front substrate 15 is colored in the first color, the bus electrodes 161a and 162a are colored in the second color, and the coloring table 40 is colored in the third color. And the third color are in a navy blue mixing relationship with each other. For example, if the front substrate 15 is colored blue, and the color table 40 is colored orange, these colors are dark blue mixed, especially complementary, and thus the fourth region 30d is black or black. It is close to. Therefore, the black ratio and the clear room contrast of the plasma display panel can be further improved.

As another example, even if the front substrate 15 is colored in orange color, and the coloring table 40 is colored in blue color, the fourth region 30d may be black or achromatic in color. Therefore, the black ratio and the clear room contrast of the plasma display panel can be further improved.

In the embodiment of the present invention, the second color of the bus electrodes 161a and 162a and the third color of the coloring table 40 are determined according to the first color of the front substrate 15. On the other hand, it is preferable that the first color and the second color have a complementary color relationship, and at the same time, the first color and the third color have a complementary color relationship. In this case, the second color and the third color may have the same material. In this case, the bus electrode and the coloring table may be formed together in the same process.

6 is a 20-color redemption table for explaining the complementary color relationship.

The relationship that overlaps or becomes colored (black, white, gray) is said to be complementary. As shown, orange is completely complementary to orange, red and cyan are completely complementary, and purple is completely complementary to light green. Although not shown in the color redemption table, black and white are also completely complementary to each other, and there are countless colors in the complementary relationship.

On the other hand, even if the color is not completely complementary, the color that is approximately complementary is dark-colored close to black. These colors easily absorb light. For example, in FIG. 6, the red color is not related to the blue complementary complementary color, but is adjacent to the blue complementary orange color. In this case, when the blue color and the deep red color are mixed blue, the color becomes close to black.

As described above, in the embodiments of the present invention, the color of the front substrate 15 and the colors of the bus electrodes 161a and 162a are in a navy blue mixed relationship with each other, and further, in a complementary color relationship.

Accordingly, when the color of the front substrate 15 is orange, the color of the bus electrodes 161a and 162a is preferably blue. Alternatively, when the color of the front substrate 15 is blue, the color of the bus electrodes 161a and 162a is preferably orange. At this time, the orange series may include brown, which has a color similar to orange.

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 scope of the invention.

As described above, according to the plasma display panel according to the present invention, the front substrate and the bus electrodes are colored in colors complementary to each other, thereby increasing the black ratio and reducing the reflection of external light, thereby increasing the clear room contrast.

In addition, since the bus electrode is formed of a single layer instead of two layers of black and white, the manufacturing process can be simplified, and the edge curl and undercut phenomenon are less likely to occur.

In addition, by forming a color band having a color complementary to the color of the front substrate in the non-discharge area corresponding to the upper part of the partition wall, it is expected to improve the contrast of the bright room. Since it can manufacture, the process becomes simple.

Claims (15)

Back substrate; A front substrate disposed opposite to the rear substrate at a distance and colored in a first color; An address electrode formed to extend in a first direction on the back substrate; A display electrode formed on the front substrate in a second direction crossing the first direction; A partition wall disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells; And A phosphor layer formed in the discharge cell; The display electrode includes a bus electrode colored in a second color in a navy blue mixing relationship with the first color. According to claim 1, And a first color colored on the front substrate and a second color colored on the bus electrode are complementary to each other. According to claim 1, The bus electrode is a plasma display panel formed of a metal material. According to claim 1, The front substrate is a plasma display panel which is colored in orange. The method of claim 4, wherein And the front substrate includes a material selected from the group consisting of Cu, Sb, and Cr. The method of claim 4, wherein And the bus electrode is colored in a blue series. The method of claim 6, And the bus electrode comprises a material selected from the group consisting of Mn, Ni, and Co. According to claim 1, And the bus electrode is colored in an orange series. The method of claim 8, The front substrate is a plasma display panel colored in a blue series. According to claim 1, And the bus electrode is formed of a single layer. According to claim 1, A color band is formed at a portion corresponding to a boundary of neighboring discharge cells along the first direction, and the color band is colored with a third color having a navy color mixing relationship with the first color. The method of claim 11, wherein And a third color colored on the front substrate and a third color colored on the color band, which are complementary to each other. The method of claim 11, wherein The coloring table is a plasma display panel colored in an orange series. The method of claim 11, wherein The coloring table is a plasma display panel colored in a blue series. The method of claim 11, wherein And the coloring table is formed simultaneously with the bus electrode.

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