KR20080045425A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve the bright room contrast by coloring a front substrate, a dielectric layer and any one of upper barrier ribs and lower barrier ribs with different color. A first substrate(10) colored by a desired color and a second substrate(301) are opposite to each other, and barrier ribs(501) are interposed between the substrates to define plural discharge cells(17), and have upper barrier ribs(501c) and lower barrier ribs(501d), of which any of the barrier ribs is colored by a desired color. A phosphor layer(19) is formed in each discharge cell. Address electrodes(11) are formed on the second substrate, and display electrodes(30) are formed on the first substrate. A dielectric layer(701) colored by a desired color is formed on the first substrate to cover the display electrodes. The first substrate, the barrier ribs and the dielectric layer are in a relation of subtractive mixture.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a perspective view schematically illustrating an exploded 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 cross-sectional view according to a second embodiment of the present invention;

4 is a cross-sectional view according to a third embodiment of the present invention;

5 is a cross-sectional view according to a fourth embodiment of the present invention;

6 is a cross-sectional view according to a fifth embodiment of the present invention, and

7 is a cross-sectional view according to a sixth embodiment of the present invention.

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

10: first substrate (back substrate) 11: address electrode

701,703,705: Dielectric layer 501,503,505: Bulkhead

501c, 503c, 505c: Upper bulkhead

501d, 503d, 505d: Lower bulkhead

17 discharge cell 19 phosphor layer

301: second substrate (front substrate) 901: protective layer

30: display electrode 31: first electrode (holding electrode)

31a, 32a: transparent electrode 31b, 32b: bus electrode

32: second electrode (scanning electrode)

101,103,105,107,109,111: plasma display panel

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 for improving luminance by subtractive mixing and complementary color effects.

In general, a plasma display panel is a visible light of red (R), green (G) and blue (B) generated by exciting the phosphor using a vacuum ultra-violet (VUV) emitted from the plasma obtained through gas discharge It is a display device for implementing an image.

As an example, an AC plasma display panel forms address electrodes on a rear substrate and covers the address electrodes with a dielectric layer. The partition walls are disposed between the address electrodes on the dielectric layer to form a stripe shape, and phosphor layers of red (R), green (G), and blue (B) layers are formed on the partition walls. On the front substrate facing the rear substrate, display electrodes composed of a pair of sustain electrodes and scan electrodes are formed along the direction crossing the address electrodes, and a dielectric layer and an MgO protective film cover the display electrodes. The discharge cell is formed at a point where the address electrodes on the rear substrate and the pair of display electrodes on the front substrate cross each other. In the plasma display panel, millions of unit discharge cells are arranged in a matrix form.

In the conventional plasma display panel as described above, the dielectric layer covering the front substrate and the display electrode is formed of a white transparent material, and the partition wall is also made of white. Accordingly, there is a problem that the external light is reflected and the luminance of the panel is lowered in the plasma display, and as a result, the image quality of the plasma display panel is lowered.

On the other hand, conventionally, there is a problem in that the number of manufacturing processes is increased by forming a separate black stripe layer in order to reduce the reflected light to improve the contrast ratio.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel which improves bright room contrast ratio by making the partition walls black with a complementary color effect while maintaining the luminance.

Another object of the present invention is to provide a plasma display panel which makes the partition wall appear black due to the complementary color effect, thereby eliminating a separate black stripe layer manufacturing process.

The present invention is to solve the above problems, according to one embodiment of the present invention, the first substrate colored in a predetermined color; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells, the partition wall including an upper partition wall and a lower partition wall, wherein at least one of the upper partition wall and the lower partition wall is colored in a predetermined color; A phosphor layer formed on the discharge cell; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; And a dielectric layer covering the display electrode and formed on the first substrate and colored in a predetermined color, wherein the three colors of the first substrate, the partition, and the dielectric layer are subtracted and mixed.

Two colors of three colors of the first substrate, the barrier rib, and the dielectric layer may be mixed with each other, and the other color may be complemented.

The first substrate may be colored in purple (M), at least one of the upper and lower partitions may be colored in cyan (C), and the dielectric layer may be colored in yellow (Y).

The first substrate may be colored in cyan (C), the upper partition may be colored in purple (M), and the dielectric layer may be colored in yellow (Y).

According to another embodiment of the invention, the first substrate; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells, the partition wall including an upper partition wall and a lower partition wall, wherein at least one of the upper partition wall and the lower partition wall is colored in a predetermined color; Phosphor layers formed on the discharge cells; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; A dielectric layer covering the display electrode and formed on the first substrate and colored in a predetermined color; And a protective layer formed on the dielectric layer and colored in a predetermined color, wherein the three walls of the barrier rib, the dielectric layer, and the protective layer are subtracted and mixed.

Two of the three colors of the barrier rib, the dielectric layer, and the protective layer may be mixed with each other, and the other color may be complemented.

At least one of the upper and lower partitions may be colored cyan (C), the dielectric layer may be colored purple (M), and the protective layer may be colored yellow (Y).

The upper partition wall may be colored purple (M), the dielectric layer may be colored cyan (C), and the protective layer may be colored yellow (Y).

 In the above embodiments, the purple (M) may be formed of any one of chromium (Cr), bismuth (Bi).

In addition, the yellow (Y) may be formed of any one of copper (Cu) and antimony (Sb).

In addition, the cyan (C) may be formed of any one of manganese (Mn), nickel (Ni), cobalt (Co).

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, and duplicate descriptions thereof will be omitted.

1 is a perspective view schematically illustrating an exploded 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 the line II-II of FIG. 1.

1 and 2, a plasma display panel 101 according to an embodiment of the present invention may include a first substrate 10 (hereinafter referred to as a “back substrate”) and the first substrate 10. A second substrate 301 (hereinafter referred to as a "front substrate") disposed at a predetermined interval and a partition wall 501 provided between the substrates 10 and 301 are included. The space between the back substrate 10 and the front substrate 301 is sealed by a sealing member (not shown). The partition wall 501 is formed at a predetermined height between the rear substrate 10 and the front substrate 301 to partition the plurality of discharge cells 17. The discharge cells 17 are filled with a discharge gas (for example, a mixed gas including neon (Ne) and xenon (Xe)) so as to generate vacuum ultraviolet rays by gas discharge. The discharge cells 17 absorb the vacuum ultraviolet rays and display visible light. A phosphor layer 19 emitting light is provided.

In order to implement an image by gas discharge, the plasma display panel includes an address electrode 11 corresponding to each discharge cell 17 on the rear substrate 10, and each discharge cell 17 on the front substrate 301. In order to correspond to the display electrode 30, a pair of first electrodes (hereinafter referred to as "hold electrodes") 31 and second electrodes (hereinafter referred to as "scan electrodes") 32 are provided.

The address electrode 11 is formed along the first direction (y-axis direction in the drawing) on the inner surface of the back substrate 10 to continuously correspond to discharge cells 17 adjacent in the y-axis direction. do. In addition, the plurality of address electrodes 11 are arranged side by side to correspond to the discharge cells 17 adjacent to each other in a second direction (the x-axis direction in the drawing) that crosses the y-axis direction.

The address electrodes 11 are covered with a dielectric layer 13 covering the inner surface of the back substrate 10 as described above. The dielectric layer 13 prevents cations or electrons from directly colliding with the address electrode 11 during discharge, thereby preventing damage to the address electrode 11, and also forms and accumulates wall charges. Since the address electrode 11 is disposed on the rear substrate 10 and does not prevent the visible light from being irradiated forward, the address electrode 11 may be formed of an opaque electrode, that is, a metal electrode having excellent electrical conductivity.

The partition wall 501 is actually provided on the dielectric layer 13 to partition the discharge cells 17. The partition wall 501 includes first partition wall members 501a extending in the y-axis direction and second partition wall members 501b extending in the x-axis direction between the first partition wall members 501a. The discharge cells 17 are formed in a matrix structure.

In addition, the partition wall may be formed of first partition wall members extending in the y-axis direction to form discharge cells in a stripe structure (not shown). That is, the discharge cells form a structure that is open along the y-axis direction.

The phosphor layer 19 formed in each of the discharge cells 17 is coated with a phosphor paste on the side of the barrier rib 501 and the surface of the dielectric layer 13 positioned between the barrier ribs 501, and dried and fired. It is formed by.

The phosphor layer 19 is formed of phosphors of the same color in the discharge cells 17 formed along the y-axis 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 17 repeatedly disposed along the x-axis direction.

On the other hand, the sustain electrode 31 and the scan electrode 32 constituting the display electrode 30 are provided on the inner surface of the front substrate 301, each discharge cell 17 to cause gas discharge in the discharge cells 17 In response to this, a surface discharge structure is formed. The sustain electrode 31 and the scan electrode 32 extend in the x-axis direction crossing the address electrode 11.

In addition, the sustain electrode and the scan electrode may be provided between the front substrate and the rear substrate to form an opposite discharge structure corresponding to the discharge cells (not shown).

Each of the sustain electrode 31 and the scan electrode 32 includes transparent electrodes 31a and 32a for generating a discharge and bus electrodes 31b and 32b for applying a voltage signal to the transparent electrodes 31a and 32a, respectively. The transparent electrodes 31 a and 32 a are portions which cause surface discharge in the discharge cell 17 and are formed of a transparent material (for example, indium tin oxide (ITO)) to secure the aperture ratio of the discharge cell 17. The transparent electrodes 31a and 32a form surface discharge structures with each of the widths W31 and W32 about the center of the discharge cell 17 along the y-axis direction, and form a center portion of each discharge cell 17. To form a discharge gap (G). The bus electrodes 31b and 32b are disposed on the transparent electrodes 31a and 32a, respectively, and extend in the x-axis direction at the outside of the discharge cell 17. Therefore, when the voltage signal is applied to the bus electrodes 31b and 32b, the voltage signal is applied to each of the transparent electrodes 31a and 32a connected to the bus electrodes 31b and 32b. Here, the bus electrodes 31b and 32b may include black electrode layers 31b and 32b that absorb external light and improve contrast, and a white electrode layer that compensates for the low conductivity of the black electrode layers 31b and 32b to improve conductivity. 31b, 32b).

 The sustain electrode 31 and the scan electrode 32 cross the address electrodes 11 and are covered with the dielectric layer 21 facing each other corresponding to the discharge cells 17. The dielectric layer 21 forms and accumulates wall charges during discharge while protecting the sustain electrode 31 and the scan electrode 32 from gas discharge.

During the driving of the plasma display panel, a reset discharge is generated by a reset pulse applied to the scan electrode 31 in the reset period, and to the scan pulse and the address electrode 11 applied to the scan electrode 32 in the addressing period following the reset period. The address discharge is caused by the address pulse applied, and then the sustain discharge is caused by the sustain pulse applied to the sustain electrode 31 and the scan electrode 32 in the sustain period.

The sustain electrode 31 and the scan electrode 32 serve as electrodes for applying a sustain pulse required for sustain discharge, and the scan electrode 32 serves as an electrode for applying a reset pulse and a scan pulse, and the address electrode ( 11 serves as an electrode for applying an address pulse. Since the sustain electrode 31, the scan electrode 32, and the address electrode 11 may have different roles depending on voltage waveforms applied to the sustain electrodes 31, the scan electrodes 32, and the address electrodes 11, they are not necessarily limited to these roles.

The plasma display panel selects the discharge cells 17 to be turned on by the address discharge due to the interaction between the address electrode 11 and the scan electrode 32, and the interaction between the sustain electrode 31 and the scan electrode 32. The selected discharge cell 17 is driven by sustain discharge, thereby realizing an image.

On the other hand, the plasma display panel of the present embodiment improves black fraction by using a subtractive mixture and complementary color relationship while maintaining brightness, and consequently, improves clear contrast. The black fraction is the ratio occupied by black, and the higher the black fraction, the brighter the contrast is. At this time, of course, it is to be avoided that the discharge cell 17 is blocked by the black portion. The bright room contrast refers to the contrast ratio in bright places. When the bright room contrast is improved, the image can be easily seen even in bright places.

Here, the subtractive mixing properties and the complementary color will be briefly described.

The color of the paint changes to a darker color as it is mixed, which is called a subtractive mixture. In paints, the three primary colors are purple (M: Magenta), yellow (Y: Yellow), and cyan (C: Cyan). In subtractive blending, the two colors in complementary colors are achromatic (gray or black). . Complementary color combinations are numerous, including red and cyan, yellow and indigo, blue and orange. Subtractive mixing decreases the brightness and saturation as it is mixed, making it closer to gray, and the mixing of complementary colors is closer to black.

In the plasma display panel 101 according to an exemplary embodiment, the front substrate 301, the barrier rib 501, and the dielectric layer 701 are colored in three different colors by applying the above-described subtraction mixing and complementary color relationship. Here, the partition wall 501 is divided into an upper partition wall 501c and a lower partition wall 501d so that at least one of them may be colored. In FIG. 2, the upper partition 501c is colored.

The three colors of the front substrate 301, the partition 501, and the dielectric layer 701 have a complementary color relationship of black by dark blue mixing. For example, the front substrate 301 may be colored purple (M), the upper partition 501c may be colored cyan (C), and the dielectric layer 701 may be colored yellow (Y).

In such a case, purple (M) of the front substrate 301 and yellow (Y) of the dielectric layer 701 are mixed to become red (R: Red), and red (R) is the upper partition 501c having a complementary color relationship. ) Is mixed with cyan (C) and becomes black (BK: Black).

The three colors of the front substrate 301, the upper partition 501c, and the dielectric layer 701 generate black portions in the non-discharge regions corresponding to the partition 501 by subtractive mixing and complementary color relations, and are generated in the discharge cells 17. Absorbs external light without blocking visible light, improving clear room contrast.

Meanwhile, as described above, the three colors of the front substrate 301, the upper partition 501c, and the dielectric layer 701 may be separately generated as black portions are generated in the non-discharge region corresponding to the partition 501 due to subtraction mixing and complementary colors. Since the black matrix does not need to be manufactured, the number of manufacturing processes is reduced.

3 to 4 are cross-sectional views illustrating plasma display panels 103 and 105 according to another exemplary embodiment of the present invention.

Referring to FIG. 3, the front substrate 303 may be colored in cyan (C), the dielectric layer 701 may be colored in yellow (Y), and the upper partition 503c may be colored in purple (M).

Referring to FIG. 4, the front substrate 301 may be colored purple (M), the dielectric layer 701 may be colored yellow (Y), and the lower partition 505d may be colored cyan (C).

5 to 7 are cross-sectional views illustrating plasma display panels 107, 109, and 111 according to still another embodiment of the present invention. In addition to adding a protective layer on a dielectric layer, the protective layer is subtracted by coloring the protective layer instead of coloring the front substrate. The structure which makes a partition look black by mixing and a complementary color relationship is shown.

Referring to FIG. 5, a protective layer 901 is further formed on the dielectric layer 703. The protective layer 901 is formed of transparent MgO that protects the dielectric layer 703 to increase the secondary electron emission coefficient upon discharge. Here, the dielectric layer 703 may be colored purple (M), the protective layer 901 may be colored yellow (Y), and the upper partition 501c may be colored cyan (C). At this time, the front substrate 305 is formed of a transparent white.

Referring to FIG. 6, the dielectric layer 705 may be colored in cyan (C), the protective layer 901 may be colored in yellow (Y), and the upper partition 503c may be colored in purple (M).

Referring to FIG. 7, the dielectric layer 703 may be colored purple (M), the protective layer 901 may be colored yellow (Y), and the lower partition 505d may be colored cyan (C).

As described above, the color arrangement for making the partition part appear black by subtraction mixing and complementary color relationship is only an example, and various color arrangements are possible.

In the above-described configurations, materials such as chromium (Cr) and bismuth (Bi) may be added to form purple (M), and copper (Cu) and antimony (Sb) to form yellow (Y). Materials may be added, and materials such as manganese (Mn), nickel (Ni), cobalt (Co) may be added to form cyan (C).

[Table 1] shows the contrast of the bright room contrast and the external light reflectance due to the effect of subtractive mixing and complementary color when the front substrate, the dielectric layer, and the partition wall (upper partition or lower partition) are colored with different three primary colors (M, Y, C). The relationship is compared with the prior art.

Conventional The present invention Real room contrast 70: 1 91: 1 External light reflectance (cd / m ² ) 15.2 10.3

In addition, [Table 2] is a clear room contrast and external light reflection due to the effect of subtraction mixing and complementary color when the dielectric layer, the protective layer, the partition (upper partition or lower partition) is colored with three different primary colors (M, Y, C), respectively The relationship between the luminance is compared with the conventional one.

Conventional The present invention Myeongsil Contrast 70: 1 92: 1 External light reflectance (cd / m ² ) 15.2 10.2

As can be seen from Tables 1 and 2, the contrast of the bright room is greatly improved as compared to the prior art through the embodiments of the present invention, and the external light reflection luminance is greatly reduced to improve the emotional image quality.

As described above, the plasma display panel according to the present invention colors the front substrate, the dielectric layer and the partition wall (upper partition or lower partition) in different colors, or the dielectric layer, the protective layer and the partition wall (upper partition or lower partition) are different colors. It is possible to make the partition part black by color by subtracting mixing and complementary color to improve the bright room contrast, and to greatly reduce the external light reflection luminance, thereby greatly improving the sensitivity image quality.

In addition, there is an advantage that the production cost is reduced and the process is reduced by not manufacturing a separate black matrix for improving the brightness.

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.

Claims (14)

A first substrate colored in a predetermined color; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells, the partition wall including an upper partition wall and a lower partition wall, wherein at least one of the upper partition wall and the lower partition wall is colored in a predetermined color; A phosphor layer formed on the discharge cell; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; And A dielectric layer covering the display electrode and formed on the first substrate and colored in a predetermined color; And three colors of the first substrate, the partition, and the dielectric layer are subtracted and mixed. The method of claim 1, And a complementary color by mixing two colors of the three colors of the first substrate, the barrier rib, and the dielectric layer with the other color. The method of claim 2, The first substrate is colored in purple (M), at least one of the upper and lower partitions is colored in cyan (C), and the dielectric layer is colored in yellow (Y). The method of claim 2, The first substrate is colored in cyan (C), the upper partition is colored in purple (M), and the dielectric layer is colored in yellow (Y). The method according to claim 3 or 4, The purple (M) is a plasma display panel formed of any one of chromium (Cr), bismuth (Bi). The method according to claim 3 or 4, The yellow (Y) is formed of any one of copper (Cu) and antimony (Sb) plasma display panel. The method according to claim 3 or 4, The cyan (C) is formed of any one of manganese (Mn), nickel (Ni), cobalt (Co). A first substrate; A second substrate disposed at a predetermined distance from the first substrate; A partition wall disposed between the first and second substrates to partition discharge cells, the partition wall including an upper partition wall and a lower partition wall, wherein at least one of the upper partition wall and the lower partition wall is colored in a predetermined color; Phosphor layers formed on the discharge cells; An address electrode formed on the second substrate corresponding to the discharge cells; A display electrode formed as a pair of electrodes on the first substrate corresponding to the discharge cells; A dielectric layer covering the display electrode and formed on the first substrate and colored in a predetermined color; And And a protective layer formed on the dielectric layer and colored in a predetermined color. And three colors of the barrier rib, the dielectric layer, and the protective layer are subtracted and mixed. The method of claim 8, And a complementary color by mixing two of the three colors of the barrier rib, the dielectric layer, and the protective layer and the other one. The method of claim 9, At least one of the upper and lower barrier ribs is colored in cyan (C), the dielectric layer is colored in purple (M), and the protective layer is colored in yellow (Y). The method of claim 9, And the upper partition wall is colored purple (M), the dielectric layer is colored cyan (C), and the protective layer is colored yellow (Y). The method according to claim 10 or 11, wherein The purple (M) is a plasma display panel formed of any one of chromium (Cr), bismuth (Bi). The method according to claim 10 or 11, wherein The yellow (Y) is formed of any one of copper (Cu) and antimony (Sb) plasma display panel. The method according to claim 10 or 11, The cyan (C) is manganese (Mn). A plasma display panel formed of any one of nickel (Ni) and cobalt (Co).

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