KR20080040985A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance light emitting efficiency of phosphor formed on a rear dielectric layer by coloring the rear dielectric layer with a reflective color. A rear substrate(10) is separated at a constant interval from a front substrate(15). An address electrode(11) is extended in a cross direction on the rear substrate. A rear dielectric layer(12) is formed on the rear substrate to cover the address electrode and is colored with a first color. A barrier rib(13) is formed between the front and rear substrates in order to define discharge cells. A phosphor layer(14) is formed in the inside of the discharge cells. A display electrode(16) is extended in another direction on the front substrate. A front dielectric layer(17) is formed on the front substrate in order to cover the display electrode and is colored with a second color. A filter(19) is arranged on the outside of the front substrate 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 perspective view schematically showing 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: scanning electrode

16b: sustain 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, an 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 in the plasma display panel.

Various attempts have been made to improve image quality in such plasma display panels. There are ways to improve the contrast ratio by increasing the black ratio, to reduce the reflected luminance so that the image is easily realized, and to improve the luminance by increasing the luminous efficiency. However, the clear contrast can be improved while simplifying the manufacturing process. The need for technology development is emerging.

The present invention provides a plasma display panel in which three different layers are colored to provide high luminous efficiency, low reflectance, and improved black ratio and clear room contrast.

According to the present invention, a plasma display panel includes a rear substrate facing a front substrate at intervals, an address electrode formed to extend in one direction on the rear substrate, and formed on the rear substrate covering the address electrode and colored in a first color. A back dielectric layer, a partition wall partitioning respective discharge cells between the front substrate and the back substrate, a phosphor layer formed inside the discharge cell, and a display electrode formed to extend in the other direction crossing the one direction on the front substrate. And a front dielectric layer covering the display electrode and formed on the front substrate and colored in a second color, and a filter disposed outside the front substrate and colored in a third color. The three colors are subtracted from each other.

In addition, in the plasma display panel according to the present invention, a color in which any two selected colors among the first color, the second color, and the third color are mixed is preferably in 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 addition, the front substrate is preferably a colorless transparent substrate. In addition, the partition wall is preferably made of a colorless transparent partition wall material.

In the plasma display panel according to the present invention, the phosphor layer may be formed on the rear dielectric layer. In addition, the partition wall may be colored in a fourth color. In addition, the fourth color may be a yellow series. In addition, the barrier rib and the rear dielectric layer may have the same material.

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.

1 is a perspective view schematically showing 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 (shown in the drawing).

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 an embodiment of the present invention, the horizontal partition wall member 13a and the vertical partition wall member 13b partition discharge cells in a lattice form.

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

The red (R), green (G), and blue (B) discharge cells are respectively formed according to the type of the phosphor layer 14, and the red discharge cell, the green discharge cell, and the blue discharge cell form one pixel. Achieve. In this case, the phosphor layer 14 may include a white powder having a high reflectance in order to improve luminance.

Each discharge cell in which the phosphor layer 14 is formed is filled with a discharge gas (eg, a mixed gas including xenon (Xe), neon (Ne), etc.) to cause plasma discharge.

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 16a and a sustain electrode 16b, and the scan electrode 16a and the sustain electrode 16b are formed on the front substrate 15 in a second direction (x-axis direction in the drawing). It is elongated and formed along. In addition, the display electrodes 16 are formed to be parallel to each other at predetermined intervals from other display electrodes 16 adjacent to each other.

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

First, the address electrodes 11 extend in the first direction (y-axis direction in the drawing) on the rear substrate 10 and are arranged in parallel with each other in a stripe shape along the discharge cells.

In addition, the address electrode 11 is embedded in the back dielectric layer 12. The back dielectric layer 12 protects the address electrode 11 from discharge and easily accumulates electric charges around the address electrode 11. Be sure to In addition, a partition 13 is formed on the rear dielectric layer 12, and the partition 13 partitions respective discharge cells.

The front dielectric layer 17 covers the scan electrode 16a and the sustain electrode 16b, 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.

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.

As shown in FIG. 2, the display electrode 16 includes a scan electrode 16a and a sustain electrode 16b, and a bus electrode 20 is formed on a lower surface thereof.

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

The sustain electrode 16b and the scan electrode 16a 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 the respective discharge cells.

The filter 19 is formed on the outer surface of the front substrate 15. The filter 19 absorbs a small amount of infrared rays emitted from the discharge cell. In addition, the filter 19 absorbs external light shining onto the front substrate 15 to reduce the luminance of reflection of the plasma display panel.

When the plasma display panel is driven, near-infrared rays and electromagnetic waves of 800-900 nanometers are emitted from inside the panel. Such near-infrared rays are similar to infrared rays used in a remote controller, which may cause a malfunction of the device.

The characteristics required for the filter 19 to solve this problem include near-infrared absorptivity, reflectance, electromagnetic wave blocking rate, abrasion resistance, and heat resistance. Although there are various methods of forming the filter 19, typical methods include a method of forming a transparent conductive film on the front substrate 15, a method of applying a resin, and the like, and a method of attaching a film.

According to an embodiment of the present invention, when the first color of the filter 19, the second color of the front dielectric layer 17 and the third color of the back dielectric layer 12 are subtracted or overlapped, they have a dark color such as black.

In particular, all three primary colors of colors such as cyan, magenta, and yellow are black when overlapped or mixed. Dark colors, like black, have a strong ability to absorb light. Therefore, light emitted from the outside of the plasma display panel is easily absorbed.

Therefore, to sum up more, the reflection brightness of the plasma display panel is reduced, the black fraction is increased, and the bright room contrast is increased.

If the colored pigment to enter the partition wall 13, this ratio of TiO ₂ of the intensity of the partition wall is added at a constant rate to 13 reinforcing agent relative to the higher. This increases the strength of the partition 13 to reduce the risk of the partition 13 breaking during impact or other manufacturing processes. In addition, since the partition 13 is not damaged, the problem in which the phosphor layer 14 formed on the inner side of the partition 13 is also broken together is also solved at the same time.

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 where the filter 19 and the front dielectric layer 17 are mainly overlapped, and the second region 30b is mainly due to the filter 19, the front dielectric layer 17 and the back dielectric layer 12 overlapping. This is the visible area.

According to an embodiment of the present invention, in the plasma display panel in which the back dielectric layer 12 is colored in the first color, the front dielectric layer 17 is colored in the second color, and the filter 19 is colored in the third color. When the first color is yellow, the second color is magenta, and the third color is cyan, the first region 30a is a cyan and magenta subtracted mixture. The second region 30b is a region in which cyan, magenta, 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, since the back substrate 10 colored in yellow does not absorb visible light formed in the discharge cells, the effect of increasing the luminous efficiency of the phosphor is greater than other colors.

In an embodiment of the present invention, the filter 19 is colored magenta, the front dielectric layer 17 is colored cyan, and the back dielectric layer 12 is colored yellow. However, there is no particular limitation on the kind of colored colors.

In order to increase the black ratio and reduce the reflection brightness, it is preferable that the first color, the second color, and the third colors be complementary to each other. It is also preferable that the back substrate is colored with a color that does not readily absorb 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 (blue-green), 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 relationship between the colors being mixed or overlapping becomes the achromatic color (White, Gray, Black). Green has a complementary color relationship with magenta, yellow has a complementary color relationship with blue, and red has a complementary color relationship 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 addition, any two selected colors among the three primary colors of the color material appear subtracted and mixed may be said to have a complementary color relationship 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 back dielectric layer 12, the second color of the front dielectric layer 17, and the third color of the filter 19 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.

When the above-mentioned back dielectric layer 12 is colored in yellow and the partition 13 is also colored in the same color, the color density thereof is further reduced. Thus, the partition wall 13 or the back dielectric layer 12 colored in light color does not absorb much of the visible light generated in the phosphor layer 14. Therefore, the luminous efficiency of the phosphor is increased.

In addition, when the partition 13 and the rear dielectric layer 12 have the same color, they may have the same material, thereby simplifying the manufacturing process.

In the embodiment of the present invention, in order to color the front dielectric layer, the back dielectric layer, the filter 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, by coloring the filter, the front dielectric layer, and the bottom dielectric layer, respectively, in a specific color, the reflection luminance of the entire panel is lowered, and the black ratio and the bright room contrast are improved.

In addition, since the back dielectric layer is colored with a color that easily reflects visible light such as yellow, the luminous efficiency of the phosphor formed on the back dielectric layer is increased.

In addition, when the partition wall and the back dielectric layer are colored in the same color as the back dielectric layer, they may have the same material with each other, thereby simplifying the manufacturing process.

Claims (9)

A back substrate facing the front substrate at intervals; An address electrode formed to extend in one direction on the rear substrate; A back dielectric layer covering the address electrode and formed on the back substrate and colored in a first color; Barrier ribs that partition respective discharge cells between the front substrate and the rear substrate; A phosphor layer formed inside the discharge cell; A display electrode formed on the front substrate and extending in the other direction crossing the one direction; A front dielectric layer covering the display electrode and formed on the front substrate and colored in a second color; And A filter disposed outside 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 in which any two selected ones of the first color, the second color, and the third color are mixed is complementary to 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 front substrate is a colorless transparent substrate. According to claim 1, And the partition wall is made of a colorless transparent partition material. According to claim 1, And the phosphor layer is also formed on the back dielectric layer. According to claim 1, And the partition wall is colored in a fourth color. The method of claim 7, wherein The fourth color is a yellow display plasma display panel. The method of claim 8, And the barrier rib and the rear dielectric layer have the same material.

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