KR20080040986A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to simplify a manufacturing process by coloring a barrier rib and a dielectric layer with colors of same group. A front substrate(15) is disposed opposite to a rear substrate(10) and is colored with a first color. A barrier rib(13) is formed in a space between the front and rear substrates in order to form discharge cells. An address electrode(11) is extended in one way direction adjacent to the rear substrate. A rear dielectric layer(12) is formed on the rear substrate to cover the address electrode and is colored with a second color. A display electrode(16) is extended in the other direction crossing one way direction on the front substrate. A front dielectric layer(17) is formed on the front substrate to cover the display electrode and is colored with a third color. The first, second, and the third colors have subtractive color mixture relationship.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

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

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

4 is a view schematically showing the relationship between colors that appear when three primary colors of a color material overlap.

<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 16a: sustain electrode

16b: scan electrode 17: front dielectric layer

18: protective layer 19: filter

20: bus electrode 30: image display area

30a: first region 30b: second region

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 adopting subtractive mixing, which has a low reflection brightness and improved black ratio and clear room contrast.

In general, a plasma display panel uses ultraviolet (UV) rays emitted from a plasma obtained through gas discharge. This ultraviolet light excites the phosphor layer, and the excited phosphor layer generates visible light. The visible light has red (R), green (G), and blue (B) depending on the type of the phosphor layer, and the combination of them is realized.

As an example, the AC plasma display panel includes an address electrode on a rear substrate, and a dielectric layer covers the address electrode. In addition, a partition wall is formed in a stripe shape on the dielectric layer, and a phosphor layer is formed inside the partition wall.

The front substrate is provided spaced apart from the rear substrate by a predetermined distance, and the display electrodes, the dielectric layer, and the protective layer are sequentially formed on the front substrate. The display electrode is formed in a direction crossing the address electrode.

Discharge cells are formed at the intersections of the address electrodes on the rear substrate and the display electrodes on the front substrate, which are divided by partition walls. In addition, millions of unit discharge cells are arranged in a matrix or stripe form inside the plasma display panel.

Various attempts have been made to improve the image quality of plasma display panels. There are a method of improving the bright part contrast to improve the bright room contrast, a method of reducing the reflected brightness, and a method of improving the brightness by increasing the luminous efficiency.

In particular, a separate black layer may be formed between the front substrate and the rear substrate in order to improve the black portion and reduce the reflection brightness, but the structure of the high-definition panel may be included therein. Therefore, there is a need for a technology capable of reducing reflection luminance and improving black ratio and bright room contrast while eliminating or minimizing such a separate configuration.

SUMMARY OF THE INVENTION The present invention provides a plasma display panel in which different layers are colored and have a predetermined color so that the luminous efficiency is high, the reflection luminance is low, and the black ratio and the clear room contrast are improved.

The plasma display panel according to the present invention comprises a front substrate facing a rear substrate at intervals and colored in a first color, a partition wall forming discharge cells in a space between the front substrate and the rear substrate, and adjacent to the rear substrate in one direction. An address electrode formed to extend, a back dielectric layer formed on the rear substrate and colored in a second color, a display electrode formed on the front substrate and extended in another direction crossing the one direction; A front dielectric layer covering and formed on the front substrate and colored in a third color, wherein the first color, the second color, and the third color are subtracted from each other.

In addition, in the plasma display panel according to the present invention, it is preferable that a color appearing by subtracting any two selected colors among the first color, the second color, and the third color has a complementary color relationship with the other color. In addition, the first color, the second color and the third color is preferably any one of the colors selected from among the three primary colors of the magenta (Cagenta), cyan (Yellow) and the yellow (Yellow) series of colors, respectively. .

In the plasma display panel according to the present invention, the partition wall may be made of a transparent partition wall material. In addition, the partition wall may be colored in a fourth color. In addition, the fourth color may be of the same series as the second color. In addition, the fourth color may be a yellow series. In addition, the barrier rib and the rear dielectric layer may be formed of the same material, and thus the barrier rib and the rear dielectric layer may be formed in the same process.

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 for clarity, 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 partial perspective view schematically illustrating a plasma display panel according to an embodiment of the present invention.

Referring to FIG. 1, the plasma display panel of this embodiment includes a back substrate 10 and a front substrate 15 facing each other. A partition 13 is formed between the rear substrate 10 and the front substrate 15, and these partitions a plurality of discharge cells 19.

The partition wall 13 includes a vertical partition wall member 13b formed to extend in a first direction (y-axis direction in the drawing) and a horizontal partition wall member 13a formed to extend in a second direction (x-axis direction in the drawing). do. As illustrated, the horizontal partition wall member 13a and the vertical partition wall member 13b are perpendicular to each other. In the embodiment of the present invention, the horizontal partition wall member 13a and the vertical partition wall member 13b partition the discharge cells 19 in a grid form.

There are various forms and structures of the discharge cells 19, and the discharge cells 19 partitioned by the partition wall 13 may be formed in various forms such as a stripe or a delta pattern in addition to the grid pattern described above.

Each of the discharge cells 19 forms a minimum unit for displaying an image, and a plurality of discharge cells 19 form a pixel. In addition, a phosphor layer 14 is formed inside the discharge cells 19 to absorb ultraviolet rays obtained through plasma gas discharge to emit visible light for each color.

Although not described in detail in the drawing, discharge cells 19 emitting red, green, and blue light are formed according to the type of the phosphor layer 14, and such red discharge cells and green are formed. The discharge cell and the blue discharge cell form one pixel. In this case, the phosphor layer 14 may include a white powder having a high reflectance in order to improve luminance.

Each discharge cell 19 in which the phosphor layer 14 is formed is filled with a discharge gas to cause plasma discharge. In general, such a discharge gas is made by mixing inert gases such as helium (He), neon (Ne), and xenon (Xe) at a predetermined ratio, and the discharge characteristics change according to the pressure state and the ratio of the inert gases.

The address electrode 11 and the display electrode 16 are provided on the back substrate 10 and the front substrate 15 facing each other at predetermined intervals, respectively. The display electrode 16 includes a scan electrode 16b and a sustain electrode 16a, and the scan electrode 16b and the sustain electrode 16a are in a second direction (x-axis direction in the drawing) on the front substrate 15. It is elongated and formed along. In addition, the display electrodes 16 adjacent to one display electrode 16 are arranged in parallel with each other at a predetermined interval.

The address electrode 11 and the display electrode 16 are arranged to cross each other. The address electrode 11 and the scan electrode 16b generate an address discharge to each other to select the discharge cell 19, and between the selected discharge cell 19 and the corresponding sustain electrode 16a and the scan electrode 16b. Causes maintenance discharge.

First, the address electrode 11 is formed to extend on the rear substrate 10 in a first direction (y-axis direction in the figure) and is spaced apart from one address electrode 11 and another address electrode 11 adjacent to the address electrode 11. Are placed next to each other.

In addition, the address electrode 11 is a structure that is embedded by the back dielectric layer 12. The back dielectric layer 12 protects the address electrode 11 from discharge and accumulates electric charges around the address electrode 11. In addition, a partition 13 is formed on the rear dielectric layer 12, and the partition 13 partitions each of the discharge cells 19.

The front dielectric layer 17 covers the scan electrode 16b and the sustain electrode 16a, and the front dielectric layer 17 protects the display electrode 16 from discharge during plasma discharge. A protective layer 18 is further formed on the front dielectric layer 17, and the protective layer 18 protects the front dielectric layer 17 from discharge generated in the discharge cell 19.

The protective layer 18 not only protects the front dielectric layer 17, but also lowers the discharge start voltage by increasing the secondary electron emission coefficient. In addition, the protective layer 18 may be formed of an MgO film that easily transmits visible light.

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

The display electrode 16 includes a scan electrode 16b and a sustain electrode 16a, and a bus electrode 20 is formed on the bottom surface of the display electrode 16.

In general, the bus electrode 20 is made of a conductive metal material so as to smoothly supply voltage. In this case, the metal bus electrode 20 preferably has a narrow width so as to increase the transmittance of visible light generated in the discharge cell 19. In addition, it may be installed adjacent to the horizontal partition member 13a which partitions the discharge cell 19 or may be installed along the upper surface of the horizontal partition member 13a.

The sustain electrode 16a and the scan electrode 16b are formed of a transparent material such as indium tin oxide (ITO) so as to increase the transmittance of visible light. On the other hand, although the electrodes are continuously formed in the embodiment of the present invention, in other embodiments, it can be naturally formed in each of the discharge cells (19).

According to an embodiment of the invention, the front substrate 15 is colored in a first color, the back dielectric layer 12 is colored in a second color, and the front dielectric layer 17 is colored in a third color. In addition, when the first color, the second color, and the third color are subtracted or superimposed, the color becomes dark.

In one embodiment, when the three primary colors of the colorant cyan, magenta, and yellow are all overlapped or mixed, the black color becomes a color. This dark color is strong in absorbing light. Therefore, light emitted from the outside of the plasma display panel is easily absorbed.

In more detail, the reflection luminance of the plasma display panel is reduced, and the black ratio and the bright room contrast are improved.

On the other hand, if the partition 13 is not colored, that is, if the coloring pigment does not enter the partition 13, the ratio of TiO2, which is a strength enhancer added to the partition 13 at a predetermined ratio, is relatively high. As a result, the strength of the partition wall 13 is increased, thereby reducing the risk of breakage of the partition wall 13. In addition, the phosphor layer 14 formed on the inner surface of the partition 13 can also maintain a solid state continuously.

In addition, the partition wall 13, which is not colored, absorbs less visible light formed in the discharge cell, thereby improving the luminous efficiency of the phosphor.

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

Hereinafter, a plasma display panel according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings, and the same reference numerals are used for the same or similar parts as those of FIGS. 1 and 2, and repeated descriptions thereof will be omitted.

As shown in FIG. 3, 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 is divided into a first area 30a and a second area 30b. The first region 30a is a region in which the front substrate 15 and the front dielectric layer 17 mainly overlap, and the second region 30b is the front substrate 15, the front dielectric layer 17, and the back dielectric layer 12. It is mainly an overlapping area.

According to an embodiment of the present invention, the front substrate 15 is colored in the first color, the back dielectric layer 12 is colored in the second color, and the front dielectric layer 17 is colored in the third display. Therefore, when the first color is magenta, the second color is yellow, and the third color is cyan, the first region 30a is subtracted from the magenta and cyan. The mixed region, and the second region 30b is a region in which magenta, cyan, and yellow are subtracted and mixed.

In particular, the second region 30b easily absorbs light emitted from the outside because the three primary colors of the color material are subtracted and mixed to have a black color. Therefore, the reflected luminance of the plasma display panel is reduced, and the black fraction is increased.

On the other hand, the back dielectric layer 12 colored in yellow compared with other colors has a high effect of improving the luminous efficiency of the phosphor because the absorption of visible light formed in the discharge cell is low.

In the embodiment of the present invention, there is no particular limitation on the kind of the first color, the second color, and the third color.

On the other hand, in order to improve black ratio and clear room contrast and to reduce reflection luminance, two colors of the first color, the second color, and the third color are subtracted and mixed, and the other color is an index of complementary color. desirable. Moreover, it is preferable that a back substrate is colored by the color with large reflectance of visible light.

4 is a view schematically showing the relationship between colors that appear when three primary colors of a color material overlap.

The three primary colors of the colors are Magenta, Yellow, and Cyan, which are red, green, blue, and black when these colors are mixed or overlapped. .

Magenta is slightly blueish red (purple), cyan is slightly greenish blue (cyan), and yellow is yellow. By mixing the three primary colors of these colors or overlapping filters, different colors can be produced.

As shown in FIG. 4, yellow and magenta are subtracted and mixed to have red color, and yellow and cyan are subtracted and mixed to produce green and cyan. ) And magenta (Magenta) are subtracted to give a blue (Blue). In addition, if green and magenta are mixed and subtracted, they will be black, and if blue and yellow are subtracted, they will be black and red and cyan will be black. ) Is subtracted and black.

Colors such as magenta, yellow and cyan are called primary colors. In addition, the color which subtracts and mixes arbitrary two colors among primary colors is called secondary color. That is, red, green, and blue are called secondary colors, and these secondary colors are called three primary colors of color light (light).

It is said that the color of the subtracted mixture becomes achromatic (White, Gray, Black) is complementary. Green is complementary with magenta, yellow is complementary with blue, and red is complementary with cyan.

Magenta, Yellow and Cyan are black when they overlap or blend together, so they can be said to be complementary to each other. In other words, any two selected colors among the three primary colors of the colorant are subtracted and mixed with the other color.

In addition, even if the color is not complementary, the subtractive color of the complementary color gives a dark color close to black.

As described above, when the first color of the front substrate 15, the second color of the back dielectric layer 12, and the third color of the front dielectric layer 17 are subtracted or overlapped, they have a dark color such as black. In addition, the first color, the second color, and the third color may be formed of different colors among the three primary colors (Magenta, Cyan, Yellow) of the colorant.

In another embodiment of the present invention, the partition wall 13 may be colored in a fourth color. All kinds of colors may be applied to the fourth color, including the three primary colors of the above-described colorants. This fourth color may be yellow.

If the above-mentioned back dielectric layer 12 is colored in yellow and the partition 13 is also colored in the same color, their color density may be made thinner. Thus, the partition wall 13 or the back dielectric layer 12 colored in light color has a high reflectance with respect to visible light generated in the phosphor layer 14. Therefore, the luminous efficiency of the phosphor further increases.

In addition, when the partition 13 and the rear dielectric layer 12 are colored in the same color, they can be made of the same material. In this case, the partition 13 and the rear dielectric layer 12 may be formed by the same manufacturing process.

In an embodiment of the present invention, in order to color the front substrate, the front dielectric layer, the back dielectric layer or the partition wall to a specific color, it is preferable to add a coloring material or pigment to them. Such colored materials or pigments may be coated or applied directly to the surfaces of these layers or mixed into the raw materials. As an example, a material selected from Mn, Ni, and Co may be added or coated on the surface, and a material selected from Cu, Sb, and Cr may be added or coated on the surface.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

As described above, according to the plasma display panel according to the present invention, the front substrate, the front dielectric layer, and the back dielectric layer are colored in a specific color, respectively, so that the reflection luminance of the entire panel is lowered, and the black ratio and the bright room contrast are improved. .

In addition, since the rear dielectric layer is colored in a color having a large reflectance with respect to visible light such as yellow, the luminous efficiency of the phosphor is increased.

In addition, when the partition wall and the rear dielectric layer are colored in the same series of colors, they may have the same material, thereby simplifying the manufacturing process.

Claims (8)

A front substrate facing the back substrate at intervals and colored in a first color; Barrier ribs forming discharge cells in a space between the front substrate and the rear substrate; An address electrode formed to extend in one direction adjacent to the rear substrate; A rear dielectric layer covering the address electrode and formed on the rear substrate and colored in a second color; 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 and colored in a third color; And the first, second and third colors are subtracted and mixed with each other. According to claim 1, And a color appearing by subtracting any two selected colors from among the first color, the second color, and the third color having a complementary color relationship with the other color. According to claim 1, The first color, the second color, and the third color may be any one of different colors selected from magenta, cyan, and yellow series colors, which are three primary colors of the colorant. According to claim 1, And the partition wall is made of a transparent partition wall material. According to claim 1, And the partition wall is colored in a fourth color. The method of claim 5, And the fourth color is in the same series as the second color. The method of claim 5, The fourth color is a yellow display plasma display panel. The method of claim 5, And the barrier rib and the rear dielectric layer are made of the same material.

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