KR20100018293A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to improve contrast by maximizing the effect of complementary colors using a subtractive mixture scheme of a blue and brown first substrate and a second substrate and to increase red light emission efficiency. CONSTITUTION: A plasma display panel comprises: multiple address electrodes formed on the top of a first substrate; a first dielectric layer(5) covering the address electrodes on the front of the first substrate; plural separation walls(7) forming a discharge space; a fluorescent layer(9) formed with a slant shape on the discharge space; a second dielectric layer(15) covering the display electrodes on the front of the second dielectric layer; and a protecting film(17) covering the second dielectric layer.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel which not only reduces external light reflection, improves clear room contrast, and increases red luminous efficiency to realize a high quality screen.

The plasma display panel is a display device using a plasma phenomenon, and discharge occurs when at least one potential difference is applied between two spatially separated contacts in a gas atmosphere in a non-vacuum state, which is called a gas discharge phenomenon.

The plasma display panel should maintain high contrast, and for this purpose, it is preferable that external light coming from the outside toward the plasma display panel is not reflected.

One way of absorbing external light is to make the bus electrode black, for which purpose an additive which is usually black in the bus electrode consisting of silver (Ag) or copper-chromium-chromium (Cu-Cr-Cu) For example, a transition metal oxide such as ruthenium oxide (RuO ₃ ) or cobalt oxide (CoO ₂ ) is added. However, the transition metal oxide is to increase the blackness of the panel, and because of the energy bandgap of each of the transition metals, it is more difficult to show black than other colors.

One of the things that has been developed in consideration of these points is the method of further forming a black layer along the non-discharge area of the plasma display panel, or coloring the transparent dielectric layer covering the electrode formed on the front substrate with a different color, and the back side. In the case of a substrate, there is a method of coloring the dielectric layer covering the address electrode to black.

However, such a method of selectively covering or coloring part of the plasma display panel not only reduces the reflection of external light, but also masks the light emitted from the plasma display panel, thereby reducing the overall color and color purity of the display. .

Furthermore, in the case of selectively coloring the plasma display panel, there is a disadvantage that the color representation of the display is blurred by the colored color rather than reducing some external light reflection. Therefore, there is a problem that further impairs the brightness and the clarity of the plasma display panel and the clear room contrast as a whole.

Korean Patent Laid-Open Publication No. 2005-105703 discloses that the top dielectric layer is colored with a dark pigment such as PbO, B ₂ O ₃ , or SiO ₂ to reduce external light reflection of the plasma display panel, thereby improving the contrast in the non-discharge region of the top dielectric layer. It is mentioned that the groove can be formed to maximize luminance because the amount of visible light generated in the discharge cell is absorbed by the upper dielectric layer is reduced.

As described above, various methods have been used to reduce external light reflection luminance and improve clear room contrast, but are not yet satisfactory.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a plasma display panel capable of realizing a high quality screen by reducing external light reflection luminance, improving clear room contrast, and increasing red emission efficiency.

In order to achieve the above object, the plasma display panel according to the present invention comprises a first substrate and a second substrate disposed substantially parallel at any interval.

A plurality of address electrodes formed on the first substrate, a first dielectric layer formed on an entire surface of the first substrate while covering the address electrodes, and a plurality of partition walls provided at a predetermined height with the first dielectric layer to form a discharge space; And red, blue and green phosphor layers formed in the discharge space.

The second substrate is opposed to the first substrate, and has a plurality of display electrodes disposed on one surface in a direction crossing the address electrodes, a second dielectric layer formed on the entire surface of the second substrate while covering the display electrodes; An MgO passivation layer is disposed on the second dielectric layer while covering the second dielectric layer.

At least one of the first dielectric layer and the partition wall is colored in brown, at least one of the second dielectric layer and the second substrate is colored in blue, and the MgO passivation layer includes a red light emitting element to enhance the complementary effect therebetween. do.

In this case, the brown coloration is one kind of brown pigment selected from the group consisting of MnO ₂ , Mn ₂ O ₄ , Fe ₂ O ₃ , Cr ₂ O ₃ , ZnO, and combinations thereof, and the blue coloration is Al _2. One kind of blue pigment selected from the group is used as O ₃ , Co ₂ O ₃ , CoO, CuO, Nd ₂ O ₃ , and a combination thereof.

The red light emitting element may be one selected from the group consisting of Eu, Tb, and a combination thereof, and more preferably, Eu is used. It is included in an amount of 0.001 to 1.0% by weight, preferably 0.001 to 0.1% by weight in the protective film.

In this case, the passivation layer including the red light emitting element may be formed over the entire passivation layer, or may be formed only in the red light emitting region corresponding to the red phosphor layer.

According to the present invention, the upper and lower panel members are colored in brown and blue, respectively, and the red light emitting element in the protective film is included to maximize the complementary color effect by weak red light emission of the protective film, thereby reducing external light reflection of the plasma display panel. In addition to improving contrast and clear contrast, high-quality screens are realized by increasing red light emission efficiency.

In the plasma display panel according to the present invention, the panel members of the upper and lower panels are colored in brown and blue, respectively, by the complementary color effect according to the subtractive mixing method, and the protective film contains red light emitting elements, so that the protective film emits weak red light. Is maximized. As a result, the reflection of external light of the plasma display panel is reduced, the clear room contrast is improved, and the red light emission efficiency is increased.

1 is an exploded perspective view showing an example of a plasma display panel of the present invention. However, the plasma display panel of the present invention is not limited to the structure of FIG. 1.

Referring to the drawings, the plasma display panel of the present invention includes a first substrate 1 and a second substrate 11. In this case, the first substrate 1 is a rear substrate, and the second substrate 11 is a front substrate.

The first substrate 1 has address electrodes 3 formed in one direction (Y direction in the drawing) on the substrate, and covers the address electrodes 3 to cover the first substrate 1 on the front surface of the first substrate 1. Dielectric layer 5 is formed.

In addition, barrier ribs 7 are formed between the address electrodes 3 on the dielectric layer 5, and phosphor layers of red (R), green (G), and blue (B) colors are formed between the barrier ribs 7. 9) is located.

In addition, a pair of transparent electrodes 13a and bus electrodes 13b are disposed on one surface of the second substrate 11 opposite to the first substrate 1 along a direction orthogonal to the address electrode 3 (the X direction in the drawing). ) Display electrodes 13 are formed.

Any one of the paired display electrodes 13 is called a sustain electrode (X electrode), and the other is called a scan electrode (Y electrode). As a result, the intersection of the address electrode 3 and the display electrode 13 constitutes a discharge cell.

The second dielectric layer 15 and the passivation layer 17 are disposed on the entire second substrate 11 while covering the display electrodes 13.

With this configuration, the address discharge is applied by applying the address voltage Va between the address electrode 3 and any one of the display electrodes 13, and again discharged between the pair of display electrodes (X electrode and Y electrode). When the sustain voltage Vs is applied, vacuum ultraviolet rays generated during sustain discharge excite the phosphor of the phosphor layer 9 to emit visible light through the second substrate 11.

Since the material and the manufacturing method of each component of the plasma display panel of the present invention having the above-described structure are well known in the art, detailed descriptions thereof will be omitted since they are sufficiently understood by those skilled in the art. .

In particular, in the present invention, at least one of the first dielectric layer 5 and the partition wall 7 of the plasma display panel is colored in brown, and at least one of the second dielectric layer 15 and the second substrate 11 is colored in blue. In addition, a red light emitting element is added to the material of the protective film 17 to reduce external light reflection and improve bright room contrast.

2 is a diagram for explaining subtractive mixing of colors.

The subtraction mixing method is a method of subtracting any one color element from white to make a color. The three primary colors of the colors are magenta (M), yellow (Yellow, Y), and cyan (Cyan. C). When two colors in complementary relations are mixed, they become achromatic, such as gray or black. One example is a combination of red and indigo, green and orange. The combination is a case where one of three primary colors is combined, and there are many combinations of complementary colors.

Subtractive blending decreases brightness and saturation as you blend, near-field blending becomes neutral in the color wheel, and blending of far-field blends decreases in brightness and saturation, making it closer to gray and blending complementary colors closer to black. have.

In the present invention, according to the subtraction mixing method, the first dielectric layer 5 and / or the partition wall 7 are colored in a brown color having high reflectivity other than black, and the second dielectric layer 15 and / or the second substrate 11 are colored. ) Forms a complementary color combination with brown, and is colored in blue, which is a color capable of minimizing a decrease in transmittance of emitted light.

As the first dielectric layer 5 and / or the partition wall 7, a conventional glass composition is used, and MnO ₂ , Mn ₂ O ₄ , Fe ₂ O ₃ , Cr ₂ O ₃ , One brown pigment selected from the group consisting of ZnO, and combinations thereof is added.

In addition, the second dielectric layer 15 and / or the second substrate 11 may also be made of the glass composition similarly to the first dielectric layer 5 and the partition wall 7, wherein the glass composition may include Al ₂ O ₃ , Co _2. One blue pigment selected from the group consisting of O ₃ , CoO, CuO, Nd ₂ O ₃ , and a combination thereof is added and colored in blue.

In this case, the brown pigment is contained in an amount of 0.01 to 1% by weight, preferably 0.1 to 1% by weight, based on the total amount of the first dielectric layer 5 and / or the partition wall 7. The blue pigment is contained in an amount of 0.01 to 1% by weight, preferably 0.1 to 1% by weight, based on the total amount of the second dielectric layer 15 and / or the second substrate 11. The content of the brown pigment and the blue pigment can not only sufficiently obtain the complementary color effect by subtractive mixing within the above range, but can also minimize the decrease in luminance of the panel.

The brown colored first dielectric layer 5 and / or barrier rib 7 and blue colored second dielectric layer 15 and / or second substrate 11 may be manufactured by methods known in the art. It does not specifically limit in this invention.

For example, a glass composition and a brown pigment or a blue pigment may be mixed to prepare a composition for forming a dielectric, coated on a substrate, and then dried and baked.

Especially in this invention, the red light emitting element in the protective film 17 is added. The red light emitting element may be one selected from the group consisting of Eu, Tb, and a combination thereof. Such a red light emitting element is generally used as an activator of the phosphor, and induces red light emission.

Accordingly, in the present invention, the protective film 17 emits weak red light by adding a red light emitting element. Through the red light emission, only the brown coloration of the first dielectric layer 5 and / or the partition wall 7 is insufficient in complementary effect with the second dielectric layer 15 and / or the second substrate 11 colored blue. To maximize the complementary color effect between them. In addition, the red light emission efficiency of the red phosphor in the phosphor layer 9 can be increased by adding a red light emitting element in the protective film.

At this time, the red light emitting element is contained in 0.001 to 1.0% by weight, preferably 0.001 to 0.1% by weight in the protective film 17. When the content of the red light emitting element is within the above range, a sufficient complementary color effect of the protective film 17 can be obtained, and the decrease in luminance of the plasma display panel can be minimized.

In this case, the passivation layer including the red light emitting element may be formed over the entire passivation layer, or formed only in the red light emission region corresponding to the red phosphor layer, thereby further increasing the red light emission efficiency.

The protective film 17 may be manufactured by a method known in the art, and is not particularly limited in the present invention, and typically, chemical vapor deposition (CVD), electron beam (E-beam) deposition, and ion-plating. It can be formed using any one of (Ion-plating) and sputtering.

As such, the plasma display panel according to the present invention colors the first dielectric layer 5 and / or the partition wall 7 in brown, and the second dielectric layer 15 and / or the second substrate 11 in blue. And the red light emitting element in the protective film 17 is included. As a result, the complementary color effect is maximized by the weak red light emission of the passivation layer 17, thereby reducing the reflection of external light of the plasma display panel, improving the clear room contrast, and increasing the red light emission efficiency to realize a high quality screen.

Hereinafter, preferred embodiments of the present invention are described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited by the following examples.

EXAMPLE

Example  One

Back panel manufacturers

Ag was coated on the back substrate made of soda-lime glass, and then patterned to form an address electrode. Subsequently, 0.02% by weight of MnO ₂ in the paste of lead-based glass was coated over the entire surface of the substrate on which the address electrode was formed and baked to form a brown colored dielectric layer.

Forming a barrier rib using a glass composition on the dielectric layer, a red phosphor layer using (Y, Gd) BO ₃ : Eu, and a blue phosphor layer using BaMgAl ₁₀ O ₁₇ : Eu in a region partitioned by the barrier rib; A rear panel was manufactured by forming a green phosphor layer using ZnSiO ₄ : Mn.

Front panel manufacturers

A display electrode including an indium tin oxide (ITO) electrode and a silver bus electrode was formed in a stripe shape on a front substrate made of soda lime glass in a conventional manner. Subsequently, 0.02% by weight of CuO in the paste of lead-based glass was included to coat and fire over the entire surface of the substrate on which the display electrode was formed to form a dielectric layer colored in blue.

After mixing MgO and Eu, a protective film was formed on the dielectric layer using an ion plating process to fabricate a front panel. At this time, the content was adjusted to contain 0.1% by weight of Eu based on the total amount of the protective film formed.

plasma  Display panel manufacturers

The front panel and the rear panel were faced to each other, sealed with a glass composition for encapsulation, and then subjected to an exhaust process to fabricate a plasma display panel. In the plasma display panel, the upper and lower dielectric layers were colored in brown and blue, respectively, and the protective layer included red light emitting elements.

Example  2

A plasma display panel was manufactured in the same manner as in Example 1, except that Eu was contained in an amount of 0.3 wt% based on the total amount of the protective film.

Example  3

A plasma display panel was manufactured in the same manner as in Example 1, except that Eu was contained in an amount of 0.5 wt% based on the total amount of the protective film.

Example  4

A plasma display panel was manufactured in the same manner as in Example 1, except that 1 wt% of Eu was included in the total amount of the protective film.

Example  5

MnO ₂ A plasma display panel was manufactured in the same manner as in Example 1 except that Cr ₂ O ₃ was used and Al ₂ O ₃ was used instead of CuO.

Comparative example  One

A plasma display panel was manufactured in the same manner as in Example 1 except that Eu was not added to the protective film.

Experimental Example 1

External light reflectance (cd / m ² ) Luminance (cd / m ² ) Real room C / R (1: x) Comparative Example 1 0.4 100 250 Example 1 0.35 98 280 Example 2 0.33 97 293 Example 3 0.32 90 281 Example 4 0.31 82 264

It can be seen that the plasma display panels according to Examples 1 to 4, in which Eu is included in the protective film, have superior brightness and clear contrast while minimizing luminance reduction as compared with Comparative Example 1.

All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

1 is an exploded perspective view showing an example of a plasma display panel of the present invention.

2 is a diagram for explaining subtractive mixing of colors.

Claims (10)

First and second substrates disposed substantially parallel at any interval; A plurality of address electrodes formed on the first substrate; A first dielectric layer formed over the first substrate while covering the address electrodes; A plurality of partition walls provided to the first dielectric layer at a predetermined height and forming a discharge space; Red, blue, and green phosphor layers formed in the discharge space; A plurality of display electrodes disposed on one surface of the second substrate opposite to the first substrate in a direction crossing the address electrodes; A second dielectric layer formed on the entire surface of the second substrate while covering the display electrodes; An MgO passivation layer disposed over the second dielectric layer and disposed thereon; At least one of the first dielectric layer and the partition wall is colored in brown, at least one of the second dielectric layer and the second substrate is colored in blue, The MgO protective film includes a red light emitting element. The method of claim 1, At least one panel member of the first dielectric layer and the partition wall may include at least one brown pigment selected from the group consisting of MnO ₂ , Mn ₂ O ₄ , Fe ₂ O ₃ , Cr ₂ O ₃ , ZnO, and combinations thereof. Plasma display panel. The method of claim 2, Wherein the brown pigment is present in an amount of 0.01 to 1.0 wt% of the panel member of at least one of the first dielectric layer and the partition wall. The method of claim 1, At least one panel member of the second dielectric layer and the second substrate may include one blue pigment selected from the group consisting of Al ₂ O ₃ , Co ₂ O ₃ , CoO, CuO, Nd ₂ O ₃ , and a combination thereof. And a plasma display panel. The method of claim 4, wherein Wherein the color pigment is 0.01 to 1.0 wt% of the panel member of at least one of the second dielectric layer and the second substrate. The method of claim 1, Wherein the red light emitting element is one selected from the group consisting of Eu, Tb, and a combination thereof. The method of claim 1, Wherein the red light emitting element is included in an amount of 0.001 to 1.0 wt% in the protective film. The method of claim 1, Wherein the red light emitting element is included in an amount of 0.001 to 0.1% by weight in the protective film. The method of claim 1, The protective film including the red light emitting element is formed over the entire second dielectric layer. The method of claim 1, The protective film including the red light emitting element is formed only in the red light emitting region corresponding to the red phosphor layer.

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