KR20090076657A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve a color temperature property by including a blue pigment of cobalt material in an electrode material. A scan electrode(102) and a sustain electrode(103) are arranged on a front substrate(101). A rear substrate(111) is faced with the front substrate. An address electrode(113) is arranged on the rear substrate. A top dielectric layer(104) is arranged on a top part of the scan electrode and the sustain electrode. A protecting layer(105) is arranged on a top part of the top dielectric layer. The protecting layer is made of MgO. A bottom dielectric layer(115) is arranged on a top part of the address electrode. A barrier rib(112) for partitioning a discharge cell is arranged on a top part of the bottom dielectric layer.

Description

Plasma Display Panel

The present invention relates to a plasma display panel.

In the plasma display panel, a phosphor layer is formed in a discharge cell divided by a partition, and a plurality of electrodes are formed.

When the drive signal is supplied to the electrode of the plasma display panel, the discharge is generated by the drive signal supplied in the discharge cell. Here, when discharged by a drive signal in the discharge cell, the discharge gas filled in the discharge cell generates vacuum ultraviolet rays, and the vacuum ultraviolet light emits the phosphor formed in the discharge cell to emit visible light. Generate. The visible light displays an image on the screen of the plasma display panel.

One embodiment of the present invention is to provide a plasma display panel having improved color temperature characteristics by improving electrode materials.

A plasma display panel according to an embodiment of the present invention includes a front substrate on which scan electrodes and a sustain electrode are arranged in parallel with each other, a rear substrate disposed to face the front substrate and including an address electrode, and include a scan electrode, a sustain electrode, and an address. At least one of the electrodes comprises a pigment.

In addition, the content of the pigment may be 0.5 parts by weight or more and 5.0 parts by weight or less with respect to the weight of the electrode containing the pigment.

In addition, the content of the pigment may be 1.0 parts by weight or more and 3.0 parts by weight or less with respect to the weight of the electrode containing the pigment.

In addition, the pigment may be blue.

In addition, the pigment may include at least one of cobalt (Co) or neodymium (Nd).

In addition, at least one of the scan electrode, the sustain electrode, and the address electrode may include a glass frit.

In addition, the plasma display panel includes an upper dielectric layer disposed over the scan electrode and the sustain electrode, and a lower dielectric layer disposed over the address electrode, and at least one of the upper dielectric layer and the lower dielectric layer includes a pigment. can do.

Plasma display panel according to an embodiment of the present invention has an effect of improving the color temperature characteristics by including a blue pigment of cobalt (Co) material or neodymium (Nd) material in the electrode material.

Hereinafter, a plasma display panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining the structure of a plasma display panel according to an embodiment of the present invention.

Referring to FIG. 1, the plasma display panel 100 according to an embodiment of the present invention includes a front substrate 101 on which scan electrodes 102 and Y and sustain electrodes 103 and Z which are parallel to each other are disposed, and a front substrate ( It may include a rear substrate 111 disposed opposite to 101 and having an address electrode 113 intersecting with the scan electrode 102 and the sustain electrode 103.

An upper dielectric layer 104 may be disposed on the scan electrode 102 and the sustain electrode 103 to insulate the scan electrode 102 and the sustain electrode 103.

A protective layer 105 may be disposed over the upper dielectric layer 104 to facilitate discharge conditions. The protective layer 105 may include a material having a high secondary electron emission coefficient such as magnesium oxide (MgO) material.

In addition, an address electrode 113 may be disposed on the rear substrate 111, and a lower dielectric layer 115 may be disposed on the address electrode 113 to insulate the address electrode 113.

In the upper portion of the lower dielectric layer 115, a discharge space, that is, a partition 112 partitioning the discharge cell may be disposed. The barrier rib 112 may be provided with a red (R), green (G), and blue (B) discharge cell between the front substrate 101 and the rear substrate 111. In addition, in addition to the red (R), green (G), and blue (B) discharge cells, white (W) or yellow (Yellow: Y) discharge cells may be further provided.

In the discharge cell partitioned by the partition wall 112, a discharge gas such as xenon (Xe), neon (Ne), or the like may be filled.

In addition, a phosphor layer 114 that emits visible light for image display may be disposed in the discharge cell partitioned by the partition wall 112. For example, a first phosphor layer emitting red (R) light, a second phosphor layer emitting blue (B) light, and a third phosphor layer emitting green (G) light are disposed. Can be. In addition to the red (R), green (G), and blue (B) light, it is also possible to further arrange other phosphor layers emitting white (W) light or yellow (Yellow: Y) light.

In addition, the thickness of the phosphor layer 114 in at least one of the red (R), green (G), and blue (B) discharge cells may be different from other discharge cells. For example, the phosphor layer of the green (G) discharge cell, ie the phosphor layer in the third phosphor layer or the blue (B) discharge cell, ie the thickness of the second phosphor layer, is the phosphor layer in the red (R) discharge cell. That is, it may be thicker than the thickness of the first phosphor layer. Here, the thickness of the third phosphor layer may be substantially the same or different from the thickness of the second phosphor layer.

In addition, the widths of the red (R), green (G), and blue (B) discharge cells may be substantially the same, but at least one of the red (R), green (G), and blue (B) discharge cells may have a width. It is also possible to differ from the width of other discharge cells. For example, the width of the red (R) discharge cell is the smallest, and the width of the green (G) and blue (B) discharge cells can be made larger than the width of the red (R) discharge cell. Here, the width of the green (G) discharge cell may be substantially the same as or different from the width of the blue (B) discharge cell. Then, color temperature characteristics of the image to be implemented may be improved.

In addition, in FIG. 1, only the case where the partition wall 112 is formed on the rear substrate 111 is illustrated, but the partition wall 112 may be disposed on at least one of the front substrate 101 and the rear substrate 111.

In addition, the above description shows only the case where the lower dielectric layer 115 and the upper dielectric layer 104 is one layer, but at least one of the lower dielectric layer 115 or the upper dielectric layer 104 is a plurality of layers. It is also possible to form a layer of.

In addition, although the width and thickness of the address electrode 113 disposed on the rear substrate 111 may be substantially constant, the width or thickness inside the discharge cell may be different from the width or thickness outside the discharge cell. For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

2 is a view for explaining an example of the structure of the scan electrode and the sustain electrode.

Referring to FIG. 2, the scan electrode 102 and the sustain electrode 103 may each have a multi-layer structure. For example, the scan electrode 102 and the sustain electrode 103 may include the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b.

Here, the bus electrodes 102b and 103b include at least one of a substantially opaque material such as silver (Ag), gold (Au), and aluminum (Al), and the transparent electrodes 102a and 103a are substantially transparent. The material may include, for example, indium tin oxide (ITO) material.

In addition, when the scan electrode 102 and the sustain electrode 103 include the bus electrodes 102b and 103b and the transparent electrodes 102a and 103a, the reflection of external light by the bus electrodes 102b and 103b is prevented. The black layers 120 and 130 may be further included between the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b.

On the other hand, the transparent electrodes 102a and 103a may be omitted from the scan electrode 102 and the sustain electrode 103. That is, the scan electrode 102 and the sustain electrode 103 can also be ITO-Less electrodes in which the transparent electrodes 102a and 103a are omitted.

3 is a diagram for explaining the configuration of an electrode.

Referring to FIG. 3, an electrode of a plasma display panel according to an embodiment of the present invention may include a metal material, a glass frit, and a pigment.

The metal material is not particularly limited, and may be any one of silver (Ag), aluminum (Al), gold (Au), copper (Cu), nickel (Ni), and chromium (Cr), or a mixture of two or more thereof. Among these, silver (Ag) may be used in consideration of manufacturing cost, corrosion prevention, electrical conductivity, and the like.

Glass frit plays a role of imparting adhesion between the electrode and the substrate, and lead oxide (PbO), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium oxide (TiO ₂ ), and iron oxide (Fe ₂₎ O ₃ ), boron oxide (B ₂ O ₃ ), bismuth oxide (Bi ₂ O ₃ ), zinc oxide (ZnO), or a mixture of two or more thereof.

The pigment is included in the electrode material so that the electrode has a blue-based color, and may include a cobalt (Co) material or a neodymium (Nd) material in consideration of ease of powder manufacturing, color, manufacturing cost, and the like.

Here, a migration phenomenon may occur in which a color of a predetermined region of the dielectric layer in contact with the electrode is changed when the plasma display panel is driven.

Accordingly, the pigment included in the electrode material may be diffused into the dielectric layer by the migration phenomenon.

For example, when a pigment is included in the scan electrode or the sustain electrode, the pigment may spread to the upper dielectric layer disposed on top of the scan electrode or the sustain electrode, thereby changing the index blue color of the pigment of the upper dielectric layer. It will be possible.

In addition, even when the pigment is included in the address electrode, the pigment may spread to the lower dielectric layer disposed on the address electrode, thereby changing the color of the lower dielectric layer to a blue color.

As such, when the blue pigment is added, the color temperature of the plasma display panel may be increased, and when the color temperature is increased, the viewer may feel that the image is clearer.

Looking at the composition ratio of the metal material, glass frit, pigment, the metal material may be approximately 90 parts by weight or more and 96 parts by weight or less, glass frit may be 4 parts by weight or more and 6 parts by weight or less, and the pigment is 0.5 parts by weight or more and 5 parts by weight or less. Or 1 part by weight or more and 3 parts by weight or less.

When the content of the metal material is 90 parts by weight or less, the electrical conductivity may be lowered. When the content of the metal material is 96 or more, the content of the glass frit and the pigment may be decreased, thereby reducing the adhesion between the substrate and the electrode and the color temperature.

In addition, when the content of the glass frit is 4 parts by weight or less, the adhesion between the substrate and the electrode may be lowered. When the content of the glass frit is 6 parts by weight or more, the content of the metal material and the pigment may be decreased, thereby decreasing the electrical conductivity and the color temperature of the electrode. .

Next, the content of the pigment will be described in detail later with reference to FIG. 4.

Next, an example of the manufacturing method of the electrode will be described.

First, a metal material, a glass frit, and a pigment are mixed.

For example, silver (Ag) powder and glass frit mixture powder may be mixed with a metal, and a cobalt (Co) material may be mixed with the pigment.

Subsequently, an electrode paste may be prepared by mixing silver (Ag) powder, glass frit mixture powder, and cobalt (Co) powder with a binder, a solvent, and the like.

Thereafter, the electrode paste may be applied to the front substrate or the rear substrate, and the coated electrode paste may be dried or baked to form an electrode.

In the above, only an example of a method of forming an electrode has been described, and the present invention is not limited thereto.

4 is a view for explaining the color temperature and the electrical conductivity according to the content of the pigment.

Here, FIG. 4 illustrates the relationship between the color temperature characteristics and the electrical conductivity of the electrode while changing the content of the blue pigment contained in the electrode from 0 parts by weight to 6 parts by weight, and a cobalt (Co) material is used as the blue pigment. It was.

Looking at Figure 4, ◎ indicates that the color temperature is very good, or the electrical conductivity of the electrode is very good, ○ indicates relatively good, X represents a low color temperature, or low electrical conductivity, very poor. .

First, looking at the color temperature according to the content of the blue pigment, when the content of the blue pigment is 0 parts by weight, the color temperature is very poor (X). The reason is that since the electrode does not contain a blue pigment, there is no effect of improving the color temperature.

On the other hand, when the content of the blue pigment is 0.5 parts by weight, the color temperature is relatively good (○). In this case, the color temperature may be low, but the degree may be insignificant.

In addition, when the content of the blue pigment is 1 part by weight or more, the color temperature is very good (?). The reason is that the electrode contains a sufficient amount of a blue pigment, the blue pigment contained in the electrode is more blue than the color of the original phosphor during discharge, the color temperature can be improved, thereby allowing the viewer to feel the image clear Because.

Next, looking at the electrical conductivity of the electrode according to the content of the blue pigment, the electrical conductivity is very good (◎) when the content is 0 parts by weight or more and 3 parts by weight or less. The reason is that the content of the blue pigment is sufficiently low that the electrode may include a relatively large amount of metal material, and thus the electrical conductivity of the electrode is very excellent.

In addition, when the content of the blue pigment is 3.5 parts by weight or more and 5 parts by weight or less, the electrical conductivity is relatively good (○). In this case, the electrical conductivity may be low, but the degree may be insignificant.

On the other hand, when the content of the blue pigment is 5.5 parts by weight or more, the electrical conductivity is very poor (X). The reason is that the content of the blue pigment is excessively high, so that the content of the metal material in the electrode is low, and thus the electrical conductivity is excessively low.

In view of the above, the content of the blue pigment may be 0.5 parts by weight or more and 5 parts by weight or less, or 1 part by weight or more and 3 parts by weight or less in order to prevent the electrical conductivity of the electrode from decreasing while improving the color temperature.

5 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention. 5 illustrates an example of a method of operating a plasma display panel according to an embodiment of the present invention, and the present invention is not limited to FIG. 5.

Referring to FIG. 5, a reset signal may be supplied to a scan electrode in a reset period for initialization. The reset signal may include a ramp-up signal and a ramp-down signal.

For example, in the set-up period, a rising ramp signal may be supplied to the scan electrode to gradually increase the voltage. Then, in the setup period, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

In the set-down period after the setup period, the rising ramp signal may be supplied to the scan electrode after the rising ramp signal in the opposite polarity direction. Then, a weak erase discharge, that is, a set down discharge, occurs in the discharge cell. By this set-down discharge, wall charges such that address discharge can be stably generated in the discharge cells remain uniformly.

In the address period after the reset period, a scan bias signal that substantially maintains a voltage higher than the lowest voltage of the falling ramp signal, for example, the sixth voltage V6, is supplied to the scan electrode.

In addition, a scan signal falling from the scan bias signal may be supplied to the scan electrode.

Meanwhile, the pulse width of the scan signal Scan supplied to the scan electrode in the address period of at least one subfield may be different from the pulse width of the scan signal of another subfield. For example, the width of the scan signal in the subfield located later in time may be smaller than the width of the scan signal in the preceding subfield. In addition, the reduction of the scan signal width according to the arrangement order of the subfields may be made gradually, such as 2.6 Hz, 2.3 Hz, 2.1 Hz, 1.9 Hz, or 2.6 Hz, 2.3 Hz, 2.3 Hz, 2.1 Hz ... 1.9 GHz, 1.9 GHz, or the like.

As such, when the scan signal is supplied to the scan electrode, the data signal may be supplied to the address electrode corresponding to the scan signal.

When the scan signal and the data signal are supplied, an address discharge may be generated in the discharge cell to which the data signal is supplied while the voltage difference between the scan signal and the data signal and the wall voltage generated by the wall charges generated in the reset period are added. .

Here, the sustain bias signal may be supplied to the sustain electrode in order to prevent the address discharge from becoming unstable due to the interference of the sustain electrode in the address period.

The sustain bias signal can keep the sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and larger than the voltage of the ground level GND.

Subsequently, in the sustain period for displaying an image, a sustain signal may be supplied to at least one of the scan electrode and the sustain electrode. For example, a sustain signal may be alternately supplied to the scan electrode and the sustain electrode.

When such a sustain signal is supplied, the discharge cell selected by the address discharge is added with the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal, and a sustain discharge, i.e., display between the scan electrode and the sustain electrode when the sustain signal is supplied. Discharge may occur.

Meanwhile, in the at least one subfield, a plurality of sustain signals are supplied in the sustain period, and the pulse width of at least one sustain signal of the plurality of sustain signals may be different from the pulse widths of other sustain signals. For example, the pulse width of the sustain signal that is supplied first of the plurality of sustain signals may be larger than the pulse width of other sustain signals. Then, the sustain discharge can be more stabilized.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

1 is a view for explaining the structure of a plasma display panel according to an embodiment of the present invention.

2 is a diagram for explaining an example of the structure of a scan electrode and a sustain electrode.

3 is a diagram for explaining a configuration of an electrode.

4 is a view for explaining the color temperature and the electrical conductivity according to the content of the pigment.

5 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention;

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

100 plasma display panel 102 scanning electrode

103: sustain electrode 113: address electrode

Claims (7)

A front substrate on which scan electrodes and sustain electrodes parallel to each other are disposed; A rear substrate disposed opposite the front substrate and including an address electrode; Including, And at least one of the scan electrode, the sustain electrode, and the address electrode comprises a pigment. The method of claim 1, The content of the pigment is a plasma display panel of 0.5 parts by weight to 5.0 parts by weight relative to the weight of the electrode containing the pigment. The method of claim 1, The content of the pigment is a plasma display panel is 1.0 to 3.0 parts by weight based on the weight of the electrode containing the pigment. The method of claim 1, And said pigment is blue. The method of claim 1, The pigment includes a plasma display panel of at least one of cobalt (Co) or neodymium (Nd). The method of claim 1, And at least one of the scan electrode, the sustain electrode, and the address electrode includes a glass frit. The method of claim 1, The plasma display panel includes an upper dielectric layer disposed over the scan electrode and the sustain electrode, and a lower dielectric layer disposed over the address electrode. At least one of the upper dielectric layer or the lower dielectric layer comprises the pigment.

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