KR20080039031A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to decrease an absorptance of visible rays by lowering a coloring degree of barrier ribs, thereby improving its luminance. A first substrate(10) and a second substrate(20) are placed opposite to each other. Address electrodes(12) are extended in a first direction on the first substrate. Display electrodes are extended on a bottom surface of the second substrate in a second direction crossing the first direction. A dielectric layer(28) is formed on the bottom surface of the second substrate to cover the display electrodes, the dielectric layer having plural layers colored by different colors. Barrier ribs(16) are disposed between the first substrate and the second substrate to define discharge cells(18). The barrier ribs are colored by a subtractive color mixed with the colors of the dielectric layer.

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 the line II-II of FIG. 1.

3 is a plan view illustrating color relations subtracted and mixed between a dielectric layer and a partition of a plasma display panel according to a first embodiment of the present invention.

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

FIG. 5 is a cross-sectional view taken along line IV-IV of FIG. 4.

FIG. 6 is a plan view illustrating color relationships subtracted and mixed between a front substrate, a dielectric layer, and a partition of a plasma display panel according to a second embodiment of the present invention.

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

10; Back substrate 20; Front board

16; Bulkhead 28; Dielectric layer

28a; First layer 28b; Second layer

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 capable of preventing external light incident on the front surface of the plasma display panel from being reflected to reduce the display ability of an image.

Typically, a plasma display panel is formed of red (R), green (G) and blue (B) generated by exciting a phosphor using vacuum ultraviolet (VUV) emitted from a plasma generated through gas discharge. Implement the image with visible light.

The plasma display panel is classified into a direct current type and an alternating current type according to the applied driving voltage and the structure of the discharge cell. A schematic configuration of an alternating current plasma display panel (hereinafter referred to as a "plasma display panel") will be described. do.

First, address electrodes are formed on a rear substrate, and the address electrodes are covered with a dielectric layer. The partition walls are disposed between the address electrodes on the dielectric layer to form a stripe or matrix shape. The front substrate is spaced apart from the rear substrate so as to face each other, and display electrodes including a pair of sustain electrodes and scan electrodes are formed along a direction crossing the address electrodes. The display electrode is covered with a dielectric layer and a protective film (MgO protective film). A discharge cell is formed at a point where the pair of address electrodes on the rear substrate and the pair of display electrodes on the front substrate cross each other. Phosphor layers of red (R), green (G), and blue (B) are formed inside the discharge cell.

In the plasma display panel having the above-described configuration, millions of unit discharge cells are arranged in a matrix, and an image necessary for discharging the selected discharge cells among these discharge cells is displayed.

By the way, when the above-described method is used, while the plasma display panel according to the prior art displays an image on the front surface, external light generated from various light sources is incident on the front surface of the plasma display panel.

In this case, the external light incident on the front surface of the plasma display panel is partially reflected from the front surface of the plasma display panel and mixed with the visible light displayed by the plasma display panel, thereby degrading the display performance of the image actually expressed by the plasma display panel.

In order to improve the above problems and improve the black ratio, a separate black layer may be formed between the front substrate and the rear substrate. However, the high-definition panel may have a limited configuration that may be included therein. There is a need for a technique that can improve the contrast contrast while eliminating or minimizing the composition.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel capable of preventing the display performance of a plasma display panel from being deteriorated due to external light reflection by forming a colored layer of color relationship subtracted and mixed with elements constituting the plasma display panel.

In order to achieve the above object, the present invention provides a first substrate and a second substrate that are spaced apart from each other, an address electrode extending in a first direction from an upper surface of the first substrate, and a cross of a first direction on a lower surface of the second substrate A display electrode extending in two directions, a plurality of layers formed on a lower surface of the second substrate to cover the display electrodes, and a plurality of layers disposed between the first substrate and the second substrate, the dielectric layers being colored in different colors; It includes a partition wall partitioning each discharge cell, it is preferable that the partition wall is colored in the color of the color relationship that is subtracted and mixed color of the colors to be colored in the dielectric layer.

In the above configuration, the dielectric layer may include a first layer that is colored with a first color, a second layer that is formed on the first layer and that is colored with a second color that is different from the first color.

In addition, the partition wall may be colored with a third color different from the first color and the second color of the dielectric layer, and the first color to the third color may be formed of any one of three primary colors of the subtraction mixture.

The first color of the dielectric layer is made of cyan, the second color of the dielectric layer is made of yellow, and the third color of the partition wall is made of purple.

In addition, in order to achieve the above object, the present invention provides a first substrate, a second substrate spaced apart from the first substrate, the second substrate to be colored in a first color, the address electrode extending in a first direction on the first substrate, A display electrode extending in a second direction crossing the first direction on the second substrate, and formed in a plurality of layers on the second substrate to cover the display electrode, wherein the plurality of layers are colored in a different color from the first color; And a partition wall disposed between the dielectric layer and the first and second substrates to partition each of the discharge cells, wherein the partition wall is colored with a mixed color of the first color and the color colored in the dielectric layer and a color of a subtracted color relationship. desirable.

In the above configuration, the dielectric layer may include a first layer that is colored with a second color, a second layer that is formed on the first layer and that is colored with a third color that is different from the second color.

The barrier rib is colored with a fourth color having the same color as any one of the second and third colors of the dielectric layer, and the first to third colors are made of any one of the three primary colors of the subtractive mixture. Can be.

The third color and the fourth color are the same color, the first color of the second substrate is made of cyan, the second color of the dielectric layer is made of purple (Magenta), and the third color of the dielectric layer is made of It may be made of yellow, and the fourth color of the partition wall may be made of yellow.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details are set forth in order to provide a more general understanding of the invention, such as the following description and the annexed drawings, these specific details are illustrated for the purpose of illustrating the invention and are meant to limit the invention to those details. It is not. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

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 the line II-II of FIG. 1.

A configuration of a plasma display panel according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The plasma display panel includes a first substrate 10 (hereinafter referred to as a "back substrate"), a second substrate (hereinafter referred to as a "front substrate"), a rear substrate 10 and a front substrate that are disposed to face each other at a predetermined interval. The partition wall 16 provided between 20 is included.

In the plasma display panel, an address electrode 12 and a display electrode are formed to correspond to each discharge cell 18 between the rear substrate 10 and the front substrate 20 so as to realize an image by gas discharge. 21 and a scan electrode 22 are provided.

The address electrode 12 extends along the first direction (y-axis direction in the drawing) on the inner surface of the back substrate 10 and continuously corresponds to the discharge cells 18 adjacent in the first direction. . In addition, the plurality of address electrodes 12 are arranged side by side to correspond to adjacent discharge cells 18 in a second direction (the x-axis direction of the drawing) that crosses the first direction. Since the address electrode 12 is disposed on the rear substrate 10 and does not prevent the visible light from being irradiated forward, the address electrode 12 may be formed of an opaque electrode (that is, a metal electrode having excellent conductivity). The address electrode 12 is disposed on the inner surface of the back substrate 10 and covered with the dielectric layer 14. The dielectric layer 14 prevents cations or electrons from directly colliding with the address electrode 12 during discharge, thereby preventing damage to the address electrode 12 and forming and accumulating wall charges.

1 and 2, the sustain electrode 21 and the scan electrode 22 are formed on the bottom surface of the front substrate 20, and the sustain electrode 21 and the scan electrode 22 are the address electrodes 12. And correspond to the discharge cells 18, and are covered with a dielectric layer 28 facing each other.

The dielectric layer 28 is formed of a plurality of layers, and the plurality of layers are colored in different colors. The dielectric layer 28 includes a first layer 28a colored in a first color, and a second layer 28b formed on the first layer 28a and colored in a second color different from the first color. do. The mixed color of the first color 28ac colored in the first layer 28a of the dielectric layer 28 and the second color 28bc colored in the second layer 28b of the dielectric layer 28 is applied to the partition 16. It forms a color relationship subtracted from the third color 16c to be colored and prevents the display efficiency of the plasma display panel from being lowered due to external light reflection. The dielectric layer 28 having the above-described structure forms and accumulates wall charges during discharge while protecting the sustain electrode 21 and the scan electrode 22 from gas discharge. The dielectric layer 28 is covered with the protective film 29. The passivation layer 29 is formed of magnesium oxide (MgO) that protects the dielectric layer 28 to increase the secondary electron emission coefficient upon discharge.

The partition wall 16 is formed on the dielectric layer 14 at a predetermined height between the rear substrate 10 and the front substrate 20 to partition the plurality of discharge cells 18. The partition 16 has a first color 28ac colored in the first layer 28a of the dielectric layer 28 and a second color 28bc colored in the second layer 28b of the dielectric layer 28 as described above. It is colored by the 3rd color 16c which has the color relationship to which the mixed color of and the subtraction is mixed.

In the first embodiment of the present invention, the first color 28ac colored in the first layer 28a of the dielectric layer 28 is used as cyan, and the second layer 28b of the dielectric layer 28 is colored. The second color 28bc is used as yellow, and the third color 16c, which is colored on the partition wall 16, is subtracted from green and subtracted as a mixed color of the first color 28ac and the second color 28bc. It can be used as purple (Magenta) with mixed color relationship.

However, the present invention is not limited thereto, and the first color 28ac colored in the first layer 28a of the dielectric layer 28 and the second color 28bc and the partition wall 16 of the dielectric layer 28 are colored. The third colors 16c may be formed in a color series forming a color relationship in which the third colors 16c are subtracted and mixed with each other.

On the other hand, in the discharge cell 18 partitioned through the partition wall 16, a discharge gas (for example, a mixed gas including neon (Ne) and xenon (Xe)) is filled to generate vacuum ultraviolet rays by gas discharge. A phosphor layer 19 is provided which absorbs vacuum ultraviolet rays and emits visible light. As shown in FIG. 1, the partition wall 16 includes a first partition member 16a formed in a first direction and a second partition member 16b formed in a second direction perpendicular to the first partition member 16a. ), The discharge cells 18 are formed in a matrix structure. In addition, the partition wall may be formed to extend in the first direction, and the plurality of partition walls may be disposed side by side in the second direction to form discharge cells in a stripe structure (not shown).

The phosphor layer 19 formed in each of the discharge cells 18 is formed by applying a phosphor paste on the side surface of the partition wall 16 and the surface of the dielectric layer 14 and firing it. The phosphor layer 19 is formed of phosphors of the same color in the discharge cells 18 formed along the first direction. In addition, the phosphor layer 19 is repeatedly formed by the phosphors of red (R), green (G), and blue (B) in the discharge cells 18 repeatedly arranged along the second direction.

On the other hand, the sustain electrode 21 and the scan electrode 22 is provided on the inner surface of the front substrate 20, so that the surface discharge structure corresponding to each discharge cell 18 so as to cause gas discharge in the discharge cell 18 Form. The sustain electrode 21 and the scan electrode 22 extend in a second direction crossing the address electrode 12.

Each of the sustain electrodes 21 and the scan electrodes 22 includes transparent electrodes 21a and 22a for generating a discharge and bus electrodes 21b and 22b for applying a voltage signal to the transparent electrodes 21a and 22a, respectively. do. Each of the transparent electrodes 21a and 22a is a part which causes surface discharge in the discharge cell 18, and is a transparent material (eg, indium tin oxide, ITO) to secure the aperture ratio of the discharge cell 18. Is formed. The bus electrodes 21b and 22b are formed of a metal material having excellent conductivity to compensate for the high electrical resistance of the transparent electrodes 21a and 22a.

In the driving of the plasma display panel having the above-described configuration, in the reset period, reset discharge is caused by a reset pulse applied to the scan electrode 22. In the addressing period following the reset period, address discharge is caused by a scan pulse applied to the scan electrode 22 and an address pulse applied to the address electrode 12. Thereafter, in the sustain period, sustain discharge is caused by a sustain pulse applied to the sustain electrode 21 and the scan electrode 22.

The sustain electrodes 21 and the scan electrodes 22 serve as electrodes for applying sustain pulses required for sustain discharge, and the scan electrodes 22 serve as electrodes for applying reset pulses and scan pulses. The address electrode 12 serves as an electrode for applying an address pulse. The sustain electrode 21, the scan electrode 22, and the address electrode 12 may have different roles depending on voltage waveforms applied to the sustain electrode 21, the scan electrode 22, and the address electrode 12, respectively.

The plasma display panel selects a discharge cell 18 to be turned on by the address discharge due to the interaction between the address electrode 12 and the scan electrode 22, and the interaction between the sustain electrode 21 and the scan electrode 22. An image is realized by driving the selected discharge cells 18 by the sustain discharge.

3 is a plan view illustrating color relations subtracted and mixed between a dielectric layer and a partition of a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 3, a mixed color of the first color 28ac colored in the first layer 28a of the dielectric layer 28 and the second color 28bc colored in the second layer 28b of the dielectric layer 28. 30c and green are in a color relationship subtracted and mixed with the third color 16c colored on the partition 16, and are shown as black 24c at the portion where the dielectric layer 28 and the partition 16 overlap. . For reference, a portion where the second color 28bc colored on the second layer 28b of the dielectric layer 28 and the third color 16c colored on the partition 16 overlap with each other is indicated by a red color 32c. .

As described above, the first color 28ac colored in the first layer 28a of the dielectric layer 28 and the second color 28bc and the partition wall 16 colored in the second layer 28b of the dielectric layer 28. As the black color 24c is displayed at the portion where the colored third colors 16c overlap with each other, the dielectric layer 28 is colored with external light incident through the front substrate 20 and the dielectric layer 28 of the plasma display panel. And it is absorbed in the process of passing through the partition 16, it is possible to prevent the degradation of display performance due to reflection of external light.

Referring to Table 1, the external light due to the external light reflection due to the complementary color effect of the dielectric layer 28 colored with the first color 28ac and the second color 28bc, and the partition wall 16 colored with the third color 16c, respectively. It can be seen that the reflectance is reduced. When the external light reflectance is reduced, the user's emotional image quality is greatly improved.

division FW luminance FW color temperature FW Power Consumption External light reflectance Luminous efficiency Example 209 7234 291 11.6 2.31 Brown bulkhead 197 7466 304 11.4 2.14

As described above, in the present invention, the three primary colors of the subtractive mixture, Cyan, Magenta, and Yellow, are subtracted by coloring the dielectric layers 28 and the partition walls 16 of the plasma display panel in different colors, respectively. By maintaining the color relationship to be mixed, the external light reflection layer can be formed to reduce external light reflection.

In addition, since the three primary colors of the subtraction mixture are primary colors, the degree of coloring is lower than that of the secondary colors (the colors in which the primary colors are mixed). Accordingly, the transmittance of the dielectric layer 28 can be reduced, and the degree of coloring of the partition 16 can be designed weakly, thereby minimizing the decrease in luminance due to the visible light absorption of the partition 16.

If a color relationship is to be subtracted by combining two colors by subtraction mixing, one color should be a primary color and the remaining colors should be a secondary color. In this case, the portion colored in the secondary color has a disadvantage in that the transmittance is reduced or the visible light is absorbed in comparison with other portions to reduce the luminance.

For example, when the dielectric layer 28 formed on the lower surface of the front substrate 20 is colored in the secondary color, the transmittance decreases, and when the partition 16 is colored in the secondary color, the colored partitions 16 are colored. Luminance may be reduced by absorbing visible light.

Accordingly, in the present invention, the three primary colors of the subtractive mixture, blue green, purple, and yellow, may be colored on the dielectric layers 28 and the partition walls 16, respectively, to reduce external light reflection luminance.

This configuration has a lower degree of coloring than the layers composed of secondary colors because all three layers are composed of primary colors of three primary colors. Therefore, the visible light transmittance can be increased by lowering the coloring degree of the dielectric layer 28 as compared with the complementary color structure having the two layers, and the luminance due to the reduction of the visible light absorption of the partition 16 by lowering the coloring degree of the partition 16. The reduction can be minimized.

The color combination for the three primary colors of the subtractive blending may be variously made through various design changes.

On the other hand, the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the invention.

In the first embodiment described above, the first layer 28a of the dielectric layer 28 colored in the first color 28ac and the dielectric layer 28 colored in the second color 28bc among the elements constituting the plasma display panel. Although the partition wall 16 colored by the 2nd layer 28b and the 3rd color 16c of the color relationship which is subtracted-mixed with the mixed color 30c of the 1st color 28ac and the 2nd color 28bc was demonstrated, One of ordinary skill in the art can improve subtractive color relationships for components of such plasma display panels.

4 is a partially exploded perspective view of a plasma display panel according to a second embodiment of the present invention, and FIGS. 5 and 6 are subtracted and mixed with a front substrate, a dielectric layer, and a partition of a plasma display panel according to a second embodiment of the present invention. It is sectional drawing and top view which show the color relationship.

Referring to the above drawings, the second embodiment of the present invention colors the first color 20c on the front substrate 20 and turns the dielectric layer 28 to the first layer 28a and the second layer 28b. Each color is distinguished by the second color 28ac and the third color 28bc, and the partition 16 is colored by the fourth color 16c. Here, the third color 28bc and the fourth color 16c are colored with the same color, and the color of the color relationship subtracted and mixed with the mixed color 34c of the first color 20c and the second color 28ac. Color. That is, in the case of coloring each of the four layers of the elements constituting the plasma display panel as described above, three primary colors of subtractive blending are selected for the three layers, respectively, and colored in different colors, and three layers for the other layer. It may be used by coloring in the same color as any of the colors colored in.

For example, in the second embodiment of the present invention, blue green, which is the three primary colors of subtractive mixing, is colored on the front substrate 20, purple is colored on the first layer 28a of the dielectric layer 28, and yellow is colored on the dielectric layer ( By coloring the second layer 28b and the partition wall 16 of 28) to maintain the color relationship which is subtracted and mixed, the external light reflection layer can be formed to reduce external light reflection.

For reference, a mixed color 34c of a first color 20c colored in the first layer 28a of the dielectric layer 28 and a second color 28ac colored in the second layer 28b of the dielectric layer 28. ) Is displayed in blue, and the mixed color 36c of the second color 28ac and the third color 28bc is displayed in red. The portion where the third color 28bc colored on the second layer 28b of the dielectric layer 28 overlaps the colored fourth color 16c on the partition 16 is indicated by yellow 38c.

The above-described configuration has a lower degree of coloring compared to the secondary color because all four layers use the primary color, which is the three primary colors of the subtractive mixture. Therefore, the transmittance of the front substrate 20 and the dielectric layer 28 is not reduced much, and the degree of coloring can be weakly designed on the partition 16, thereby minimizing the decrease in luminance due to the visible light absorption of the partition 16. have.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below but also by the equivalents of the claims.

As described above, the plasma display panel according to the present invention has an effect of preventing the display efficiency from being reduced due to reflection of external light due to the enhancement of the bright room contrast due to the complementary color effect between the elements constituting the plasma display panel.

In addition, the cost of forming the black stripe layer can be reduced, and the process is reduced, thereby reducing the production time.

In addition, the three primary colors of the subtractive mixture, blue green, purple, and yellow, are colored in different colors on the front substrate, the dielectric layer, and the partition wall of the plasma display panel to maintain the color relationship that is subtracted and mixed to form an external light reflection layer to reduce external light reflection. In addition, it is possible to reduce the external light reflection brightness and minimize the brightness reduction.

In particular, as the front substrate, the dielectric layer, and the partition wall are colored in the primary colors of the subtractive mixture, respectively, the color of the front substrate and the dielectric layer can be lowered to increase the visible light transmittance. There is an effect that can improve the brightness.

Claims (14)

A first substrate and a second substrate spaced apart from each other; An address electrode extending in a first direction from an upper surface of the first substrate; A display electrode extending from a bottom surface of the second substrate in a second direction crossing the first direction; A dielectric layer formed on a lower surface of the second substrate to cover the display electrode, wherein the plurality of layers are colored in different colors; A partition wall disposed between the first substrate and the second substrate to partition each discharge cell; The barrier rib is colored in a color of a color relationship that is subtracted and mixed with a mixture of colors to be colored in the dielectric layer. The method of claim 1, The dielectric layer A first layer colored in a first color; And a second layer formed on the first layer and colored in a second color different from the first color. The method of claim 2, The barrier rib is colored in a third color different from the first color and the second color of the dielectric layer, and the first to third colors are made of any one of three primary colors of subtractive mixing. . The method of claim 3, And a first color of the dielectric layer is blue. The method of claim 4, wherein And a second color of the dielectric layer is yellow. The method of claim 5, And a third color of the partition wall is made of purple (Magenta). A first substrate; A second substrate spaced apart from the first substrate and colored in a first color; An address electrode extending in a first direction on the first substrate; Display electrodes extending on the second substrate in a second direction crossing the first direction; A dielectric layer formed of a plurality of layers on the second substrate to cover the display electrode, wherein the plurality of layers are colored in a different color from the first color; A partition wall disposed between the first substrate and the second substrate to partition each discharge cell; The barrier rib is colored in a color of a color relationship that is subtracted and mixed with a mixed color of the first color and the color colored in the dielectric layer. The method of claim 7, wherein The dielectric layer A first layer colored in a second color; And a second layer formed on the first layer and colored in a third color having a color different from that of the second color. The method of claim 8, The barrier rib is colored with a fourth color having the same color as any one of the second color and the third color of the dielectric layer, and the first color to the third color is any other of three primary colors of the subtraction mixture. Plasma display panel. The method of claim 9, And the third color and the fourth color are the same color. The method of claim 9, And a first color of the second substrate is made of cyan. The method of claim 11, And a second color of the dielectric layer is purple (Magenta). The method of claim 12, And a third color of the dielectric layer is yellow. The method of claim 9, And a fourth color of the partition wall is yellow.

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