KR20080044697A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to decrease the reflected luminescence by using subtractive mixture of upper and lower barrier ribs colored by first and second colors and first and second dielectric layers colored by third and fourth colors. A front substrate(10) and a rear substrate(15) are opposite to each other, and barrier ribs are interposed between the front and rear substrates to define plural discharge cells. Address electrodes(11) are extended in a first direction on the rear substrate, and display electrodes(16) are formed on the front substrate in a second direction crossing the first direction. A front dielectric layer(17) is formed on the front substrate to cover the display electrodes. The barrier rib has a lower barrier rib layer(13aa) colored by a first color and an upper barrier rib layer(13ab) colored by a second color. The front dielectric layer has a first dielectric layer(17a) colored by a third color and a second dielectric layer(17b) colored by a fourth color. The first to fourth colors are subtractive mixture.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

4 is a color redemption table illustrated to explain 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

13aa, 13ba: lower partition layer 13ab, 13bb: upper partition layer

13aa: first lower partition layer 13ab: first upper partition layer

13ba: second lower partition layer 13bb: second upper partition layer

14 phosphor layer 15 front substrate

16: display electrode 16a: sustain electrode

16b: scanning electrode 16aa, 16ba: transparent electrode

16ab, 16bb: bus electrode 17: front dielectric layer

17a: first dielectric layer 17b: second dielectric layer

18: protective layer 19: discharge cell

30: image display area 30a: first area

30b: second area

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 reflection brightness is reduced and black ratio and clear room contrast are improved by coloring different layers in a subtractive mixing relationship in the internal structure of the panel. .

In general, the plasma display panel uses a vacuum ultra-violet (VUV) emitted from a plasma obtained through gas discharge. Such vacuum ultraviolet rays excite the phosphor, and the excited phosphor generates stabilizing visible light. The visible light is red, green, and blue depending on the type of the phosphor, and these are properly combined to realize an image.

In the plasma display panel of the AC type surface discharge structure, which is most commonly employed, an address electrode is formed on a rear substrate, and a dielectric layer covers the address electrode. In addition, the partition wall is formed in a stripe shape on the dielectric layer to form discharge cells, and a phosphor layer is formed inside the discharge cells. The phosphor layer emits visible light of red (R), green (G), and blue (B) colors by ultraviolet rays.

Display electrodes are formed on the front substrate facing the rear substrate, and a dielectric layer and a protective layer are sequentially formed. The display electrode includes a transparent electrode made of indium tin oxide (ITO), and the protective layer is formed of a material such as transparent MgO. In addition, the display electrodes are arranged in a direction crossing the address electrodes of the rear substrate.

In the plasma display panel, discharge cells are formed in a matrix or stripe shape. These discharge cells are formed at the intersection of the display electrode of the front substrate and the address electrode of the rear substrate.

In bright conditions, that is, bright room conditions, 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.

Various attempts have been made to improve the image display capability of such plasma display panels. A method of improving the bright room contrast by increasing the black ratio and decreasing the reflection brightness and improving the luminance of the panel by increasing the luminous efficiency have been proposed.

The present invention provides a plasma display panel in which the front dielectric layer and the partition wall are colored to efficiently improve the black portion and the bright room contrast without any additional configuration.

Plasma display panel according to an embodiment of the present invention, the rear substrate and the front substrate facing each other at intervals, the partition wall disposed in the space between the front substrate and the rear substrate partitioning a plurality of discharge cells, one side from the rear substrate An address electrode formed to extend in a direction, a display electrode formed to extend in another direction crossing the one direction on the front substrate, and a front dielectric layer covering the display electrode and formed on the front substrate, wherein the partition wall includes: A lower partition layer colored in a first color and an upper partition layer colored in a second color, wherein the front dielectric layer comprises a first dielectric layer colored in a third color and a second dielectric layer colored in a fourth color; The first color, the second color, the third color, and the fourth color are in a blue color mixing relationship with each other.

In the plasma display panel according to the embodiment of the present invention, it is preferable that the first color and the second color are complementary to each other. In addition, the third color and the fourth color is preferably in a complementary color relationship with each other. In addition, the second color and the fourth color are preferably complementary to each other. In addition, the first color is preferably orange or blue.

In addition, in the plasma display panel according to the embodiment of the present invention, a material selected from the group consisting of copper (Cu), antimony (Sb), and chromium (Cr) is added to be colored in orange. In addition, it is preferable that a material selected from the group consisting of manganese (Mn), nickel (Ni) and cobalt (Co) is added and colored in a blue series.

In the plasma display panel according to the embodiment of the present invention, the upper partition layer is formed on the lower partition layer, the lower partition layer is adjacent to the rear substrate, and the upper partition layer is adjacent to the front substrate. It is preferably formed. In addition, the first dielectric layer is formed on the second dielectric layer, so that the second dielectric layer is formed adjacent to the rear substrate, and the first dielectric layer is formed adjacent to the front substrate.

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 an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.

Referring to these drawings, the plasma display panel of this embodiment corresponds to the discharge cells 19 partitioned by the partition wall 13 between the rear substrate 10 and the front substrate 15 and the discharge cells 19. And address electrodes 11 and display electrodes 16 formed thereon.

The back substrate 10 and the front substrate 15 face each other at predetermined intervals. In addition, the address electrodes 11 are formed on the upper surface of the rear substrate 10 in a first direction (y-axis direction in the drawing). In addition, one address electrode 11 is arranged in parallel with another neighboring address electrode 11 at a predetermined interval. 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 electrodes 11.

The display electrodes 16 are formed on the lower surface of the front substrate 15 in the second direction (the x-axis direction in the drawing). In addition, one display electrode 16 is disposed side by side with a predetermined distance from the other display electrode 16 neighboring.

The display electrodes 16 include a scan electrode 16b and a sustain electrode 16a, respectively. The scan electrode 16b and sustain electrode 16a include bus electrodes 16ab and 16bb and transparent electrodes 16aa and 16ba. In addition, the transparent electrodes 16aa and 16ba are spaced apart by a predetermined distance to form a discharge gap corresponding to each discharge cell 19.

On the other hand, in consideration of transmittance, the sustain electrode 16a and the scan electrode 16b include the transparent electrodes 16aa and 16ba as described above. The transparent electrodes 16aa and 16ba have an advantage of efficiently transmitting visible light, but have a disadvantage of poor electrical conductivity due to high electrical resistance. Meanwhile, the bus electrodes 16ab and 16bb are made of a metal material such as silver (Ag) having high conductivity, so that voltages can be effectively applied to the transparent electrodes 16aa and 16ba.

A front dielectric layer 17 is formed on the 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 plasma discharge. The front dielectric layer 17 also accumulates wall charges and causes discharge therebetween.

This front side dielectric layer 17 includes a first dielectric layer 17a and a second dielectric layer 17b. In particular, the first dielectric layer 17a is formed closer to the front substrate 15 than the second dielectric layer 17b. In more detail, the first dielectric layer 17a is formed on the lower surface of the front substrate 15. In addition, the lower surface of the first dielectric layer 17a has a structure in which a second dielectric layer 17b is formed. The first dielectric layer 17a or the second dielectric layer 17b covers the display electrode 16.

Further front dielectric layer 17 is covered with 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 effectively. For example, the protective layer 18 is formed of magnesium oxide (MgO) having a high transmittance of visible light.

As described above, the partition wall 13 is formed between the protective layer 18 and the back dielectric layer 12 to partition the discharge cell 19. The partition 13 includes a horizontal partition member 13a and a vertical partition member 13b.

The horizontal partition member 13a includes a first lower partition layer 13aa and a first upper partition layer 13ab. In the structure thereof, the first upper partition layer 13ab is positioned on the first lower partition layer 13aa. In addition, the vertical partition wall member 13b includes a second lower partition wall layer 13ba and a second upper partition wall layer 13bb. In the structure thereof, the second upper partition layer 13bb is positioned on the second lower partition layer 13ba.

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

Discharge cells 19 partitioned by the partition wall according to an embodiment of the present invention may be formed in a variety of forms, such as a stripe or delta in addition to the matrix (Matrix) form. The partition wall of this type prevents cross talk 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 (eg, a mixed gas of Ne and Xe). This discharge gas causes a gas discharge between the sustain electrode 16a and the scan electrode 16b. Vacuum Ultra Violet (VUV) emitted by the gas discharge activates the phosphor layer 14 applied in the discharge cell 19. The activated phosphor is stabilized to emit visible light, and the visible light is combined to realize an image.

The lower partition layers 13aa and 13ba according to the exemplary embodiment of the present invention are colored with the first color, and the upper partition layer layers 13ab and 13bb are colored with the second color. The first color and the second color are in a subtractive mixing relationship. Therefore, when these colors overlap, the brightness becomes low and dark. In particular, when they are complementary to each other, these colors overlap and become black or near black.

In addition, the first dielectric layer 17a according to the embodiment of the present invention is colored in the third color, and the second dielectric layer 17b is colored in the fourth color. The third color and the fourth color are in a subtractive mixing relationship. Therefore, when these colors overlap, the brightness becomes low and dark. In particular, when they are complementary to each other, when these colors overlap, they are black or near black.

In particular, in the embodiment of the present invention, the first color of the lower partition layers 13aa and 13ba and the second color of the upper partition layer have a primary complementary color relationship, and the second color and the second color of the upper partition layers 13ab and 13bb are the second. The fourth color of the dielectric layer has a secondary complementary color relationship, and the fourth color of the second dielectric layer and the third color of the first dielectric layer have a tertiary complementary color relationship. That is, they are in triple complementary relationship.

As described above, when the first dielectric layer, the second dielectric layer, the upper partition layer, and the lower partition layer are in the triple complementary color relationship, the reflection luminance is further reduced, and the black portion and the bright room contrast are further improved. For example, the effect is greater than the complementary color relationship only between the upper and lower bulkhead layers.

The first color of the lower partition layers 13aa and 13ba, the second color of the upper partition layers 13ab and 13bb, the third color of the first dielectric layer 17a and the fourth color of the second dielectric layer 17b, and These relationships will be described in more detail with reference to FIGS. 3 and 4.

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

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 and a second area 30b. The first region 30a is a region where the phosphor layer 14 is visible through the front dielectric layer 17 of the front substrate 15, and the second region 30b is through the front dielectric layer 17 of the front substrate 15. It is an area | region where the partition 13 is seen.

For example, if the third color of the first dielectric layer 17a is blue, and the fourth color of the second dielectric layer 17b is orange, the third color and the fourth color are subtracted from each other, in particular, they are complementary. have. In addition, when the second color of the upper partition layers 13ab and 13bb is blue, and the first color of the lower partition layers 13aa and 13ba is orange, the second color and the first color may also be subtracted from each other, in particular, They are in complementary relations. In addition, the fourth color and the first color are also subtracted from each other, in particular, they are complementary.

Accordingly, the first region 30a according to the embodiment of the present invention has a single complementary color relationship, and the second region 30b has a triple complementary color relationship. Accordingly, the first region 30a and the second region 30b, particularly the second region 30b, have a color close to black or black. Therefore, the black ratio of the plasma display panel is further increased, whereby the bright room contrast can be effectively improved and the reflection brightness is further reduced.

As the front dielectric layer and the partition wall are subtracted mixed or complementary, a black stripe layer does not need to be formed. Therefore, the production process is reduced to reduce the production cost and production time.

The present invention relates to a plasma display panel having a triple complementary color, unlike an embodiment in which a single complementary color, that is, only two different layers have a complementary color relationship, and has a lower reflectance luminance than a single complementary structure. Clear room contrast has a further improved feature.

In an embodiment of the present invention, the lower barrier rib layers 13aa and 13ba, the upper barrier rib layers 13ab and 13bb, the first dielectric layer 17a and the second dielectric layer 17b are respectively the first color, the second color, and the third. In order to color with a hue and a 4th color, it is preferable to add a coloring substance to these. Such coloring material may be coated on the surface of each layer or added to the raw material.

A material selected from manganese (Mn), nickel (Ni) and cobalt (Co) may be added to or coated on the surface to make it blue, and copper may be coated on the surface to make it orange. A material selected from Cu), antimony (Sb) and chromium (Cr) may be added or coated on the surface. In the present invention, the front dielectric layer 17 and the partition wall 13 are colored in blue and orange color. Of course, however, it may be colored in a color other than these colors.

4 is a color redemption table illustrated to explain the complementary color relationship.

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

On the other hand, even if the color is not complementary, the subtractive color of the complementary color is darker than black. This color also has the property of easily absorbing light. For example, in FIG. 4, crimson is not complementary to blue, but crimson is adjacent to orange, which is a complementary color of blue, and at this time, when subtracting blue and crimson, the color is black.

As described above, in the embodiment of the present invention, the first color of the lower partition layers 13aa and 13ba and the second color of the upper partition layers 13ab and 13bb have a complementary color relationship, and The second color and the fourth color of the second dielectric layer 17b are also complementary, and the fourth color of the second dielectric layer 17b and the first color of the first dielectric layer 17a are also complementary.

Therefore, when the first color is orange, the second color is preferably blue. In addition, the fourth color is preferably an orange series, and the first color is preferably a blue series. At this time, the orange series may include brown, which has a color similar to orange.

In addition, when the first color is blue, the second color is preferably orange. In addition, the fourth color is preferably blue-based, and the first color is preferably orange-based.

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 first color of the colored lower partition layer and the second color of the colored upper partition layer and the third color of the colored first dielectric layer and the colored second dielectric layer The fourth colors are subtracted and mixed with each other, and by overlapping them in the panel, the reflection brightness is reduced, and the black ratio and the bright room contrast are improved.

Further, the first color of the lower partition layer and the second color of the upper partition layer are complementary to each other, the second color of the upper partition layer and the fourth color of the second dielectric layer are complementary to each other, and The fourth color and the third color of the first dielectric layer are complementary to each other. As a result, the panel has a triple complementary color relationship, and thus the reflection luminance is reduced, and the black ratio and the bright room contrast are further improved.

Claims (9)

Rear and front substrates facing each other at intervals; A partition wall disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells; An address electrode formed to extend in one direction on the back substrate; A display electrode formed on the front substrate and extending in the other direction crossing the one direction; And A front dielectric layer covering the display electrode and formed on the front substrate; The partition includes a lower partition layer colored in a first color and an upper partition layer colored in a second color, The front side dielectric layer comprises a first dielectric layer colored in a third color and a second dielectric layer colored in a fourth color, And the first color, the second color, the third color, and the fourth color are in a blue color mixing relationship with each other. According to claim 1, And the first color and the second color are complementary to each other. According to claim 1, And the third color and the fourth color are complementary to each other. According to claim 1, And the second color and the fourth color are complementary to each other. The method according to any one of claims 1 to 4, The first color is an orange or blue based plasma display panel. The method of claim 5, A plasma display panel in which a material selected from the group consisting of copper (Cu), antimony (Sb), and chromium (Cr) is added and colored in orange. The method of claim 5, A plasma display panel in which a material selected from the group consisting of manganese (Mn), nickel (Ni), and cobalt (Co) is added and colored in a blue color. According to claim 1, And an upper barrier layer formed on the lower barrier layer, wherein the lower barrier layer is adjacent to the rear substrate, and the upper barrier layer is adjacent to the front substrate. According to claim 1, The first dielectric layer is formed on the second dielectric layer, the second dielectric layer is formed adjacent to the rear substrate, and the first dielectric layer is formed adjacent to the front substrate.

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