KR20080042279A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance light room contrast by improving a blackening rate according to a complementary color effect. A first and second substrates(10,20) are arranged opposite to each other. A barrier rib(16) is arranged between the first and second substrates in order to define discharge cells(18). A phosphor layer(19) is formed in each of the discharge cells. An address electrode(12) is extended in a first direction on the first substrate. A first electrode(21) and a second electrode(22) are formed in a second direction crossing the first direction on the second substrate. A dielectric layer(28) is formed on the second substrate in order to cover the first and second electrodes. A filter(30) is attached to the second substrate. The second substrate, the dielectric layer, and the filter are colored with respective colors of three primary colors. The first substrate is colored with one of the three primary colors.

Description

Plasma display panel {Plasma display panel}

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

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

3 is a side cross-sectional view of a filter according to an embodiment of the present invention.

4 is a side cross-sectional view of a filter according to a modification of the present invention.

FIG. 5 is a plan view illustrating color relations subtracted and mixed between a back substrate, a front substrate, a dielectric layer, and a filter of the plasma display panel according to an exemplary embodiment of the present invention.

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

FIG. 7 is a cross-sectional view of the plasma display panel of FIG. 6, taken along the line VIII-VIII of FIG. 6.

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

10.Rear substrate 20.Front substrate 30.Filter

28. Dielectric layer 10c. First color 28c. Second color

30c..Third color

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel using a complementary color relationship.

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

The plasma display panel is classified into a direct current type and an alternating current type according to a structure of a driving voltage and a discharge cell to be supplied. Hereinafter, a configuration of an alternating current plasma display panel (hereinafter referred to as a "plasma display panel" for convenience) will be described.

First, the plasma display panel forms address electrodes on the back substrate and covers the address electrodes with a dielectric layer. The barrier ribs are formed on the dielectric layer so as to be disposed between the address electrodes, and the barrier ribs have a stripe or matrix shape.

The front substrate is spaced apart from the rear substrate to face each other, and the display substrate includes a pair of sustain electrodes and a scan electrode along a direction crossing the address electrodes. A dielectric layer and an MgO passivation layer are sequentially formed on the front substrate to cover the display electrodes.

According to the above configuration, an area where an address electrode formed on the rear substrate and a pair of display electrodes formed on the front substrate cross each other is formed, and the crossing region may constitute one discharge cell. In addition, phosphor layers of red (R), green (G), and blue (B) are formed inside the discharge cell. As a result, millions of unit discharge cells are arranged in a matrix form within the plasma display panel, and the discharged cells may be selectively discharged to display a necessary image.

Various attempts have been made to improve the ratio of black in the driving of the plasma display panel driven as described above, that is, the black portion ratio, thereby improving the clear room contrast. As an example, a method using a complementary color relationship has been developed. In the plasma display panel using this complementary color relationship, the entire dielectric material formed on the front substrate is colored with blue system, and the partition wall formed on the back substrate is colored with red system, thereby improving the clear room contrast.

However, this plasma display panel has a limitation in that the transmittance is reduced when the dielectric layer is over-colored to improve the clear color contrast, and when the over-coloring of the barrier is over, the light is absorbed a lot of the colored barrier and the luminance is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel which can improve the clear room contrast by improving the black ratio due to the complementary color relationship while maintaining a constant luminance and at the same time reduce the display performance deterioration due to reflection of external light.

In order to achieve the above object, the plasma display panel according to an embodiment of the present invention is disposed between the first substrate and the second substrate, the first substrate and the second substrate disposed to face each other to partition the discharge cells A partition wall, a phosphor layer formed on a discharge cell, an address electrode extending in a first direction on the first substrate, a first electrode and a second electrode extending on a second substrate in a second direction crossing the first direction; And a dielectric layer formed on the second substrate so as to cover the first electrode and the second electrode, and a filter attached to the surface of the second substrate, wherein the second substrate, the dielectric layer and the filter are any of three different primary colors of the navy blue mixture. It is colored in one color, and the first substrate is colored in any one of three primary colors.

The second substrate is colored in the first color, the dielectric layer is colored in the second color, the filter is colored in the third color, and the first substrate is colored in the first color.

On the other hand, the plasma display panel according to another embodiment of the present invention, a partition wall disposed between the first substrate and the second substrate, the first substrate and the second substrate disposed to face each other and partition the discharge cells, discharge cells A phosphor layer formed on the first substrate; an address electrode extending in a first direction on the first substrate; a first electrode and a second electrode extending in a second direction crossing the first direction on the second substrate; A dielectric layer formed to cover the first electrode and the second electrode, and a filter attached to the surface of the second substrate, wherein the first dielectric layer, the second dielectric layer, and the filter are any one of the three primary colors of the navy blue mixture. The first substrate is colored in any one of three primary colors.

The filter is colored in a first color, the first dielectric layer is colored in a second color, the second dielectric layer is colored in a third color, and the first substrate is colored in a first color.

In the above configuration, the first color may be made of yellow, the second color may be made of cyan, and the third color may be made of purple.

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.

FIG. 1 is a partially exploded perspective view of a plasma display panel according to an embodiment of the present invention, and FIG. 2 is a cross sectional view of the plasma display panel shown in FIG. 1 and taken along line II-II of FIG.

1 and 2, a plasma display panel according to an embodiment of the present invention includes a first substrate 10 (hereinafter referred to as a “back substrate”) and a second substrate disposed to face each other at predetermined intervals. 20 (hereinafter referred to as "front substrate") and partition walls 16 provided between the substrates 10 and 20. An upper dielectric layer 28 is formed on the lower surface of the front substrate 20, and a filter 30 is formed on the upper surface of the front substrate 20.

In the present embodiment, the back substrate 10, the front substrate 20 upper dielectric layer 28 and the filter 30 are colored in any one of the three primary colors of the navy blue mixture. Specifically, the back substrate 10 and the front substrate 20 are colored in the first color 10c, which is any one color selected from three primary colors, and the dielectric layer 28 and the filter 30 are respectively the second color 28c. ) And the third color 30c. For example, yellow may be used as the first color 10c colored on the back substrate 10 and the front substrate 20, and cyan (cyan) may be used as the second color 28c colored on the dielectric layer 28. Cyan) may be used, and purple (Magenta) having a color relationship subtracted and mixed with Green, which is the mixed color of the yellow and cyan, may be used as the third color 30c to be colored in the filter 30.

In this case, the back substrate 10 and the front substrate 20 include yellow colored raw material components, such as at least one of copper (Cu) and antimony (Sb). In addition, the phase dielectric layer 28 includes a cyan colored raw material component such as at least one of manganese (Mn), nickel (Ni), and cobalt (Co). Further, the filter 30 includes at least one component of purple colored raw material components such as chromium (Cr) and bismuth (Bi).

However, the present invention is not limited thereto, and the first to third colors may be formed in a color series that forms a color relationship in which colors are subtracted and mixed with each other. As described above, when the back substrate is colored in yellow, yellow has a low absorption rate of visible light, which is advantageous in increasing the reflectance of the back substrate.

As in the configuration of the present embodiment, four layers such as the back substrate 10, the front substrate 20, the dielectric layer 28, and the filter 30 form a dark blue mixed relationship with each other. Can be improved, and the display efficiency of the plasma panel can be prevented from being lowered due to external light reflection. Moreover, since two of the four layers are colored in the same color, these two layers can make the degree of coloring lower than the primary color.

The partition wall 16 is formed at a predetermined height between the rear substrate 10 and the front substrate 20 to partition the plurality of discharge cells 18. The discharge cell 18 is filled with a discharge gas (eg, a mixed gas including neon (Ne) and xenon (Xe)) to generate vacuum ultraviolet rays by gas discharge, and absorbs the vacuum ultraviolet rays to emit visible light. The phosphor layer 19 is provided. In addition, the partition wall 16 is made of a transparent material to minimize the absorption of the visible light emitted from the phosphor 19 to prevent the brightness is reduced.

The partition wall 16 is formed along the second direction x perpendicular to the first partition member 16a and the first partition member 16a formed along the first direction y as shown in FIG. 1. It consists of the 2nd partition member 16b, The discharge cell 18 is formed in a matrix structure by the combination of the 1st partition member 16a and the 2nd partition member 16b.

However, the structure of the discharge cell is not limited thereto. For example, the barrier rib is formed to extend in the first direction y, and the plurality of barrier ribs are arranged in parallel with the barrier rib 16 along the second direction x. Discharge cells may be formed (not shown).

A phosphor layer 19 is formed inside each discharge cell 18, and the phosphor layer 19 is formed on the surface of the transparent lower dielectric layer 14 positioned between the sidewalls of the partition walls 16 and the partition walls 16. It is formed by applying a phosphor paste, drying it and firing it.

The phosphor layer 19 is formed in the same color in the discharge cells 18R, 18G or 18B formed along the first direction y, and the red, green and blue discharge cells 18R, 18G or 18B are It is formed repeatedly along the second direction x.

On the other hand, the plasma display panel includes an address electrode 12 and a first electrode 21 so as to correspond to each discharge cell 18 between the back substrate 10 and the front substrate 20 in order to realize an image by gas discharge. Hereinafter, a "holding electrode" and a second electrode 22 (hereinafter referred to as "scanning electrode") are provided.

The address electrode 12 extends along the first direction y on the inner surface of the back substrate 10 to continuously correspond to adjacent discharge cells along the first direction y. In addition, the plurality of address electrodes 12 may be disposed side by side to correspond to adjacent discharge cells along a second direction x orthogonal to the first direction y. Since the address electrodes 12 are disposed on the rear substrate 10 as described above and do not prevent the visible light from being irradiated forward, the address electrodes 12 may be formed of opaque electrodes (that is, metal electrodes having excellent conductivity).

The dielectric layer 14 covering the address electrode 12 and the back substrate 10 as a whole is formed on the back substrate 10. 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 also forms and accumulates wall charges.

In addition, the sustain electrode 21 and the scan electrode 22 are formed on the inner surface of the front substrate 20 and have a surface discharge structure corresponding to each discharge cell 18 so as to cause gas discharge in the discharge cells 18. To form. The sustain electrode 21 and the scan electrode 22 extend in the second direction x to intersect the address electrode 12.

Each of the sustain electrodes 21 and the scan electrodes 22 includes transparent electrodes 21a and 22a for causing discharge and bus electrodes 21b and 22b for supplying voltage signals to the transparent electrodes 21a and 22a, respectively. Is formed. Each of the transparent electrodes 21a and 22a is a part which causes surface discharge in the discharge cell 18, and is formed of a transparent material, such as indium tin oxide (ITO), to secure the aperture ratio of the discharge cell 18. Can be. The bus electrodes 21b and 22b are formed of a metal material having high conductivity to compensate for the high electrical resistance of the transparent electrodes 21a and 22a.

Meanwhile, as shown in FIGS. 1 and 2, the sustain electrode 21 and the scan electrode 22 face each other to cross the address electrodes 12 so as to correspond to the discharge cells 18. Covered with

As described above, the dielectric dielectric layer 28 is formed by coloring the front substrate 20 in a second color 28c. The phase dielectric layer 28 forms and accumulates wall charges during discharge while protecting the sustain electrode 21 and the scan electrode 22 from gas discharge.

In addition, the dielectric constant layer 28 is covered with a protective film 29. The passivation layer 29 may be formed of a material that protects the dielectric film 28, for example, magnesium oxide (MgO), and increases the secondary electron emission coefficient during discharge.

On the other hand, the filter 30 attached to the upper surface of the front substrate 20 is formed to prevent the external light is reflected on the front substrate 20 exposed to the outside, it is formed to shield the electromagnetic wave.

3 is a side cross-sectional view of a filter of a plasma display panel according to an embodiment of the present invention.

Referring to FIG. 3, the filter 30 includes an electromagnetic wave shielding conductive film 31, a protective film 32, 32 ′, and an adhesive layer 34, 35.

The electromagnetic shielding conductive layer 31 may be configured to ground electromagnetic waves generated when the plasma display panel is driven to a chassis base (not shown) supporting the plasma display panel and a casing (not shown) surrounding them. The electromagnetic shielding conductive film 31 may be formed of an indium tin oxide (ITO) film or a copper mesh, and a detailed description thereof will be omitted.

The protective films 32 and 32 'include a first protective film 32 and a second protective film 32' which are attached to both surfaces of the electromagnetic wave shielding conductive film 31, respectively. The first protective film 32 is attached to the upper surface of the electromagnetic shielding conductive film 31 to protect the shape of the electromagnetic shielding conductive film 31 from the outside, and the second protective film 32 'is the electromagnetic shielding conductive film 31. It is attached to the lower surface of the) to maintain the external appearance of the filter (30).

The protective films 32 and 32 ′ have a plate shape, and the first protective film 32 is exposed to the outside and the second protective film 32 ′ is attached to the front surface of the front substrate 20. When the filter 30 is attached to the front substrate 20, the filter 30 may be attached with the second protective film 32 ′ removed.

The adhesive layers 34 and 35 are respectively provided between the electromagnetic shielding conductive film 31 and the first protective film 32 and the electromagnetic shielding conductive film 31 and the second protective film 32 'so as to adhere thereto. It is interposed. Therefore, the adhesive layers 34 and 35 may be formed of a plurality of layers of at least two layers or more depending on the number of uses of the electromagnetic shielding conductive film 31 and the protective film.

In the present embodiment, the adhesive layers 34 and 35 may include the first adhesive layer 34 interposed between the first protective film 32 and the electromagnetic shielding conductive film 31, the electromagnetic shielding conductive film 31, and the second protective layer. And a second adhesive layer 35 interposed between the films 32 '. Meanwhile, as described above, when the second protective film of the filter 30 is attached to the front substrate 20 while the second protective film is removed, the second adhesive layer 35 is disposed between the electromagnetic shielding conductive film 31 and the front substrate 20. May be intervened in

The first adhesive layer 34 and the second adhesive layer 35 have a color relationship that is subtracted and mixed with the mixed color of the first color 10c of the front substrate 20 and the second color 28c of the dielectric layer 28. The third color 30c is colored.

Therefore, the filter 30 and the front substrate 20 and the dielectric layer 28 is black at the portion overlapping, by absorbing the external light incident from the outside by the navy blue mixing can prevent the external light is reflected. Therefore, the filter 30 according to the present embodiment does not need to form a separate external light reflection prevention film.

In FIG. 3, the adhesive layer is formed on the entire region of the filter, but the present invention is not limited thereto. For example, the adhesive layers 34 'and 35' may be formed intermittently in the entire area of the front substrate, that is, the filter 30 ', as shown in FIG.

The former filter has an excellent anti-reflective performance according to the large area of the colored adhesive layer and the latter filter has an advantage of having a high front light transmittance while having an external anti-reflective performance.

FIG. 5 is a plan view illustrating a color relationship subtracted and mixed between a back substrate, a dielectric layer, a front substrate, and a filter of a plasma display panel according to an exemplary embodiment of the present invention.

In the above configuration, the filter 30 is the first color 10c of the back substrate 10 and the front substrate 20 and the second color 28c of the dielectric layer 28 through the third color 30c being colored. ) And a black relationship 24c is formed by forming a color relationship subtracted and mixed at the overlapping part. At this time, four colors, that is, the back substrate 10, the front substrate 20, the dielectric dielectric layer 28 and the filter 30, the colored colors are overlapped with the black layer 24c is darker than when the three layers overlap Will be visible. As a result, the clear room contrast can be improved and the external light incident from the outside can be prevented from being reflected. In addition, the first color 10c of the front substrate 20, the second color 28c of the dielectric layer 28, and the third color 30c of the filter 30 are lighter and more saturated than black 24c, respectively. By coloring with high yellow, cyan and purple colors, the front transmittance of visible light can be increased to improve display quality due to brightness enhancement. Furthermore, the back substrate 10 is colored in the same color as the front substrate 20 so that these colors overlap, so that the back substrate 10 and the front substrate 20 can be colored lower than the primary color. Therefore, it is more efficient to improve the luminance by lowering the absorption rate of visible light.

Meanwhile, in the present invention, the four layers, that is, the back substrate 10, the front substrate 20, the dielectric layer 28 and the filter 30 are described as examples, but not departing from the scope of the present invention. Of course, many modifications are possible without departing.

6 is an exploded perspective view of a plasma display panel according to another embodiment of the present invention, and FIG. 7 is a cross-sectional view of the plasma display panel of FIG. 6, taken along the line VIII-VIII of FIG. 6.

6 and 7, the plasma display panel has a basic configuration similar to that of the plasma display panel of the above-described embodiment. However, the structure of the dielectric layer and the portion to be colored are different from the above-described embodiment.

In this embodiment, unlike the above-described embodiment, the first dielectric layer 28'a and the second dielectric layer 28'b are sequentially formed on the lower surface of the front substrate 20 '.

In addition, the back substrate 10, the first dielectric layer 28'a, the second dielectric layer 28'b, and the filter 30 are colored in any one of three primary colors of the navy blue mixture. Specifically, the back substrate 10 and the filter 30 are colored with the first color 10c, which is any one color selected from three primary colors, and the first dielectric layer 28a 'and the second dielectric layer 28b' are each made of a first color. It is colored with two colors 28c and a third color 30c. For example, yellow is used as the first color 10c colored on the back substrate 10 and the filter 30, and cyan is used as the second color 28c colored on the first dielectric layer 28a '. (Cyan) is used, and as the third color 30c colored in the second dielectric layer 28b ', purple (Magenta) having a color relationship subtracted and mixed with green, which is the mixed color of yellow and cyan, is selected. Can be used.

In this case, the back substrate 10 and the filter 30 include yellow colored raw material components, such as at least one of copper (Cu) and antimony (Sb). The first dielectric layer 28a 'includes a cyan colored raw material component such as at least one of manganese (Mn), nickel (Ni), and cobalt (Co). In addition, the second dielectric layer 28b 'includes purple colored raw material components, such as at least one of chromium (Cr) and bismuth (Bi).

However, the present invention is not limited thereto, and the first to third colors may be formed in a color series that forms a color relationship in which colors are subtracted and mixed with each other.

The plasma display panel according to another embodiment of the present invention, which is formed as described above, may also induce improvement of bright room contrast and the like by coloring four layers.

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. Of course it belongs to the range of.

Plasma display panel according to the present invention can form a color relationship that is subtracted and mixed by coloring four layers of the component to form a deeper black, the complementary color of the three primary colors of the navy blue mixing, and to maintain high brightness in the part having a color other than black have.

Accordingly, bright room contrast can be improved by improving the black ratio according to the complementary color effect while maintaining the luminance. In addition, since two layers of the four layers are colored with the same color, the degree of coloring may be lower than that of the primary colors of the three primary colors, thereby minimizing luminance reduction.

In addition, the display efficiency can be prevented from being lowered by the reflection of the external light without forming a separate black stripe layer or the anti-reflection film, and the cost and production time required for the formation of the black stripe or the anti-reflection film can be reduced. have.

In addition, it is possible to reduce external light reflection by forming a color relationship in which the three primary colors of the navy blue mixture, blue green, purple and yellow, are subtracted and mixed by different colors on the filter, the front substrate, and the dielectric layer of the plasma display panel. It is possible to reduce the brightness while minimizing the brightness reduction.

The improvement of clear room contrast, minimization of luminance reduction, and minimization of external light reflection have an effect of preventing the display efficiency from deteriorating and improving the image quality of the plasma display panel.

Claims (8)

A first substrate and a second substrate spaced apart from each other; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; A phosphor layer formed on the discharge cell; An address electrode extending in the first direction on the first substrate; First and second electrodes respectively formed on the second substrate in a second direction crossing the first direction; A dielectric layer formed on the second substrate to cover the first electrode and the second electrode; And Filter attached to the surface of the second substrate Including; And the second substrate, the dielectric layer, and the filter are colored in any one of three primary colors of the dark blue mixture, and the first substrate is colored in any one of the three primary colors. According to claim 1, The second substrate is colored in a first color, the dielectric layer is colored in a second color, the filter is colored in a third color, and the first substrate is colored in the first color. A first substrate and a second substrate spaced apart from each other; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; A phosphor layer formed on the discharge cell; An address electrode extending in the first direction on the first substrate; First and second electrodes respectively formed on the second substrate in a second direction crossing the first direction; A first dielectric layer and a second dielectric layer sequentially formed on the second substrate to cover the first electrode and the second electrode; And Filter attached to the surface of the second substrate Including; Wherein the first dielectric layer, the second dielectric layer, and the filter are formed of one of three different primary colors of the dark blue color mixture, and the first substrate is any one of the three primary colors. The method of claim 3, wherein And the first dielectric layer is colored with a second color, the second dielectric layer is colored with a third color, and the first substrate is colored with the first color. The method according to claim 2 or 4, And the first color is yellow. The method according to claim 2 or 4, The second color is Cyan. The method according to claim 2 or 4, The third color is purple (Magenta) plasma display panel. The method according to claim 2 or 4, Wherein the first color is yellow, the second color is cyan, and the third color is purple.

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