KR20090006981A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve the color reproducibility by forming the first fluorescent material layer with YVPO4:Eu material. An upside dielectric layer(104) reclaiming a scan electrode(102) and a sustain electrode(103) is arranged on the top of a front substrate(101). The upside dielectric layer insulates while limiting the discharge current between the sustain electrode and the scan electrode. A protective layer(105) making the discharge condition facilitated is arranged on the top of the upside dielectric layer. A lower dielectric layer(115) is arranged on the rear substrate(111) in order to insulate and cover an address electrode(113). A partition(112) which is the discharge space is arranged on the top of the lower dielectric layer.

Description

Plasma Display Panel

1A to 1C are views for explaining the structure of a plasma display panel according to an embodiment of the present invention.

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

3A to 3B are views for explaining the scan electrode and the sustain electrode.

4 is a diagram for explaining the advantages of a single layer structure.

5A to 5B are views for explaining the structures of the scan electrode and the sustain electrode in more detail.

6 is a diagram for explaining the relationship between a single layer electrode structure and color reproducibility;

7 is a view for explaining a phosphor material.

8 is a view for explaining the color coordinate characteristics of the plasma display panel according to an embodiment of the present invention.

9 is a diagram for explaining another example of the phosphor layer.

10 is a view for explaining color coordinate characteristics when the phosphor layer contains a pigment.

11A to 11B are diagrams for explaining the reflectances of the first phosphor layer and the second phosphor layer.

12A to 12B are views for explaining the relationship between the content of the red pigment, the reflectance, and the brightness;

13A to 13B are views for explaining the relationship between the content of blue pigment, reflectance and luminance;

14 is a diagram for explaining an upper dielectric layer.

FIG. 15 is a diagram for explaining color coordinate characteristics when the upper dielectric layer includes a pigment. FIG.

16 is a diagram for explaining the relationship between the content of cobalt and the thickness of the upper dielectric layer.

17A to 17B are views for explaining the content of the first blue pigment in more detail.

18A to 18B are views for explaining the thickness of the upper dielectric layer.

19 is a diagram for comparing a lead free dielectric layer with a flexible dielectric layer.

20 illustrates an example of another structure of the upper dielectric layer.

21 is a diagram for explaining an example of still another structure of the upper dielectric layer.

22A to 22C are views for explaining still another example of the plasma display panel according to the embodiment of the present invention;

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

101: front substrate 102: scan electrode

103: sustain electrode 104: upper dielectric layer

105: protective layer 111: back substrate

112: partition 113: address electrode

114: phosphor layer 115: lower dielectric layer

112a: second partition 112b: first partition

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 aspect of the present invention is to provide a plasma display panel having a relatively low manufacturing cost and excellent color reproducibility.

According to an embodiment of the present invention, a plasma display panel includes a front substrate, scan electrodes and sustain electrodes that are parallel to each other when disposed on the front substrate, a rear substrate disposed to face the front substrate, and a discharge cell between the front substrate and the rear substrate. A phosphor layer formed in the partition wall and the discharge cell, the scan electrode and the sustain electrode are one layer, and the phosphor layer is a first phosphor layer emitting red light, blue. A second phosphor layer emitting light and a third phosphor layer emitting green light, wherein the first phosphor layer comprises a YVPO ₄ : Eu material.

In addition, each of the scan electrode and the sustain electrode includes a plurality of line portions crossing the address electrode, at least one connection portion connecting at least two line portions of the plurality of line portions, and at least one protrusion portion protruding from the plurality of line portions. can do.

In addition, the first phosphor layer may include an iron (Fe) material as a red pigment.

In addition, the second phosphor layer may include a cobalt (Co) material as the second phosphor material and a blue pigment.

In addition, a plasma display panel according to another embodiment of the present invention includes a front substrate, a scan electrode and a sustain electrode that are parallel to each other when disposed on the front substrate, an upper dielectric layer disposed on the scan electrode and the sustain electrode, and a front substrate. And a phosphor layer formed on the discharge cell and a partition wall that partitions the discharge cell between the front substrate and the back substrate, wherein the scan electrode and the sustain electrode are one layer, and the phosphor layer is A first phosphor layer that emits red light, a second phosphor layer that emits blue light, and a third phosphor layer that emits green light, wherein the first phosphor layer comprises YVPO ₄ : Eu material, and the upper dielectric layer comprises a glass material and a cobalt (Co) material as a pigment.

In addition, the content of the cobalt (Co) material may be 0.1 parts by weight or more and 0.6 parts by weight or less, preferably 0.15 parts by weight or more and 0.3 parts by weight or less.

In addition, the lead (Pb) content of the upper dielectric layer may be 1000 parts per million (ppm) or less.

In addition, the thickness of the upper dielectric layer may be 33 μm or more and 39 μm or less.

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

1A to 1C are views for explaining the structure of a plasma display panel according to an embodiment of the present invention.

First, referring to FIG. 1A, a plasma display panel 100 according to an embodiment of the present invention may include a front substrate 101 on which scan electrodes 102 and Y and sustain electrodes 103 and Z are arranged in parallel with each other. The rear substrate 111 disposed opposite the substrate 101 and having the address electrode 113 intersecting the scan electrode 102 and the sustain electrode 103 is bonded by a seal layer (not shown). Can be done.

An upper dielectric layer 104 is disposed on the front substrate 101 on which the scan electrode 102 and the sustain electrode 103 are disposed, and the scan electrode 102 and the sustain electrode 103 are embedded.

The upper dielectric layer 104 limits the discharge current of the scan electrode 102 and the sustain electrode 103 and can insulate the scan electrode 102 and the sustain electrode 103 from each other.

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).

In addition, an electrode, for example, an address electrode 113 is disposed on the rear substrate 111, and the rear substrate 111 on which the address electrode 113 is disposed covers the address electrode 113 and insulates the address electrode 113. A dielectric layer, such as lower dielectric layer 115, may be disposed.

On top of the lower dielectric layer 115, a discharge space, that is, a partition wall 112 such as a stripe type, a well type, a delta type, a honeycomb type, etc., which partitions a discharge cell, may be disposed. Can be. 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 displaying an image during address discharge 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, a phosphor layer of a green (G) discharge cell, that is, a phosphor layer in a third phosphor layer or a blue (B) discharge cell, that is, a thickness of a second phosphor layer in a red (R) discharge cell, Ie 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, in the plasma display panel 100 according to an exemplary embodiment, the widths of the red (R), green (G), and blue (B) discharge cells may be substantially the same, but the red (R) and green (G) colors may be substantially the same. And at least one of the blue (B) discharge cells may be different from the widths of the 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.

The width of the phosphor layer 114 disposed in the discharge cell is then changed in relation to the width of the discharge cell. For example, the width of the second phosphor layer disposed in the blue (B) discharge cell is wider than the width of the first phosphor layer disposed in the red (R) discharge cell and is also disposed in the green (G) discharge cell. The width of the third phosphor layer may be wider than the width of the first phosphor layer disposed in the red (R) discharge cell, thereby improving the color temperature characteristic of the image implemented.

In addition, the plasma display panel 100 according to an exemplary embodiment of the present invention may have not only the structure of the partition wall 112 shown in FIG. 1A but also the structure of the partition wall having various shapes. For example, the partition wall 112 includes a first partition wall 112b and a second partition wall 112a, where the height of the first partition wall 112b and the height of the second partition wall 112a are different from each other. Etc. are possible.

In the case of the differential partition wall structure, the height of the first partition wall 112b among the first partition wall 112b or the second partition wall 112a may be lower than the height of the second partition wall 112a.

In addition, although the red (R), green (G), and blue (B) discharge cells are each shown and described as being arranged on the same line in FIG. 1A, it is also possible to arrange in a different shape. For example, a delta type arrangement in which red (R), green (G) and blue (B) discharge cells are arranged in a triangular shape is also possible. In addition, the shape of the discharge cell is not only rectangular but also various polygonal shapes such as pentagon and hexagon.

In addition, in FIG. 1A, 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 the above description, only one example of the plasma display panel 100 according to an exemplary embodiment of the present invention is illustrated and described. Therefore, the present invention is not limited to the plasma display panel 100 having the structure described above. For example, the above description shows only the case where the lower dielectric layer number 115 and the upper dielectric layer number 104 are one layer, but at least one of the lower dielectric layer or the upper dielectric layer is not composed of a plurality of layers. It is also possible.

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.

Next, referring to FIG. 1B, the plasma display panel 100 may be divided into a first region 140 and a second region 150.

A plurality of first address electrodes Xa may be disposed in parallel in the first region 140. In addition, a plurality of second address electrodes Xb may be arranged side by side in the second region 150, and the plurality of second address electrodes Xb may be disposed to face the first address electrodes Xa, respectively. .

For example, when the Xa1 first address electrode and the Xam first address electrode are arranged side by side in the first region 140, the second region 150 corresponds to the Xa1 first address electrode and the Xam first address electrode, respectively, in the second region 150. The Xbm second address electrodes are arranged side by side. Here, the Xa1 first address electrode and the Xb1 second address electrode are disposed to face each other, and the Xam first address electrode and the Xbm second address electrode are also disposed to face each other.

Next, in FIG. 1C, an area A of which the first address electrode Xa and the second address electrode Xb face each other is shown in more detail.

Referring to FIG. 1C, the Xa (m-2) first address electrode and the Xb (m-2) second address electrode, the Xa (m-1) first address electrode and the Xb (m-1) second address electrode, Xam The first address electrode and the Xb (m-2) second address electrode may be disposed to face each other with a gap of d therebetween.

Here, when the distance between the first address electrode Xa and the second address electrode Xb is excessively small, the coupling between the first address electrode Xa and the second address electrode Xb is caused by coupling. If there is a possibility that current flows, while the distance between the first address electrode Xa and the second address electrode Xb is excessively large, noise in the form of stripes is displayed on the image displayed on the plasma display panel 100. Can be detected in the eyes.

In consideration of this, it may be preferable that the distance d between the first address electrode Xa and the second address electrode Xb facing each other is approximately 50 μm (micrometer) or more and 300 μm (micrometer) or less, more preferably. May be about 70 μm (micrometer) or more and 220 μm (micrometer) or less.

2 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention. 2 illustrates an example of a method of operating a plasma display panel according to an embodiment of the present invention. The present invention is not limited to FIG. 2, and the plasma display panel according to an embodiment of the present invention. How to operate the can be variously changed.

Referring to FIG. 2, 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, the voltage gradually increases from the second voltage V2 to the third voltage V3 after the voltage rises rapidly from the first voltage V1 to the second voltage V2 with the scan electrode. Rising rising ramp signals may be supplied. Here, the first voltage V1 may be a voltage of the ground level GND.

In this 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.

Here, the falling ramp signal may gradually fall from the peak voltage of the rising ramp signal, that is, the fourth voltage V4 lower than the third voltage V3 to the fifth voltage V5.

As the falling ramp signal is supplied, a weak erase discharge, that is, a setdown 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 the lowest voltage of the falling ramp signal, that is, a voltage higher than the fifth voltage V5, 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 can be made gradually, such as 2.6 Hz (microseconds), 2.3 Hz, 2.1 Hz, 1.9 Hz, or 2.6 Hz, 2.3 Hz, 2.3 Hz, 2.1 Hz. .... 1.9 ㎲, 1.9 ㎲ and so on.

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.

3A to 3B are diagrams for explaining the scan electrode and the sustain electrode.

3A to 3B, the scan electrode 102 and the sustain electrode 103 are arranged in parallel with each other and have a single layer structure.

In addition, black layers 120 and 130 may be disposed between the scan electrode 102, the sustain electrode 103, and the front substrate 101, respectively.

The scan electrode 102 and the sustain electrode 103 may be made of a metallic material having excellent electrical conductivity and easy to be formed, such as negative (Ag), gold (Au), copper (Cu), aluminum (Al), and the like. have.

As such, the scan electrode 102 and the sustain electrode 103 which are single layers may be referred to as an ITO-Less electrode in the sense that the transparent electrode is omitted.

4 is a view for explaining the advantages of the single layer structure.

Referring to FIG. 4, (a) is an example in which the scan electrode 402 and the sustain electrode 403 have a multiple layer structure, and (b) is a scan electrode (as in an embodiment of the present invention). It is an example of the case where 102 and the sustain electrode 103 are a single layer.

Referring to the case of (a), the scan electrode 402 and the sustain electrode 403 may include transparent electrodes 402a and 403a and bus electrodes 402b and 403b, respectively.

Here, the bus electrodes 402b and 403b may include at least one of substantially opaque materials such as silver (Ag), gold (Au), and aluminum (Al), and the transparent electrodes 402a and 403a may be substantially transparent. The material may include, for example, indium tin oxide (ITO) material.

In addition, when the scan electrode 402 and the sustain electrode 403 include the bus electrodes 402b and 403b and the transparent electrodes 402a and 403a, the reflection of external light by the bus electrodes 402b and 403b is prevented. The black layers 420 and 430 may be further included between the transparent electrodes 402a and 403a and the bus electrodes 402b and 403b.

Looking at an example of the manufacturing method of this (a), first to form a transparent electrode film on the front substrate 401. Thereafter, the transparent electrode film is patterned to form transparent electrodes 402a and 403a.

Thereafter, a bus electrode film may be formed on the transparent electrodes 402a and 403a, and the bus electrode films may be patterned to form bus electrodes 402b and 403b.

On the other hand, when the scan electrode 102 and the sustain electrode 103 have a single layer structure as shown in (b), after forming the electrode film on the front substrate 101, the electrode film is patterned to form a scan electrode ( 102 and the sustain electrode 103 can be formed, so that the manufacturing process is simpler than in the case of (a). Therefore, the time required for the manufacturing process can be reduced, and the manufacturing cost can be reduced.

In addition, in the case of (a), the scan electrode 402 and the sustain electrode 403 include transparent electrodes 402a and 403a, respectively, and a transparent material, for example, indium tin oxide, which is a material of the transparent electrodes 402a and 403a. (ITO) material is a relatively expensive material, and may provide a factor for increasing the manufacturing cost.

On the other hand, when the scan electrode 102 and the sustain electrode 103 are a single layer as shown in (b), the manufacturing cost can be reduced because a relatively expensive transparent material is not used.

5A to 5B are views for explaining the structures of the scan electrode and the sustain electrode in more detail.

First, referring to FIG. 5A, the scan electrode 102 and the sustain electrode 103 may include a plurality of line portions 521a, 521b, 531a, and 531b crossing the address electrode 113, and a plurality of line portions 521a, 521b, At least one protrusion 522a, 522b, 522c, 532a, 532b, and 532c may protrude from at least one of the line portions 531a and 531b.

In FIG. 13A, the scan electrode 102 includes three protrusions 522a, 522b, and 522c, and the sustain electrode 103 also includes three protrusions 532a, 532b, and 532c. The number is not limited to this. For example, the scan electrode 102 and the sustain electrode 103 may each include two protrusions, or the scan electrode 102 may include four protrusions, and the sustain electrode 103 may have three protrusions. It is also possible to include.

Alternatively, the protrusions protruding to the rear of the discharge cell from the scan electrode 102 and the sustain electrode 103, that is, the protrusions of the numbers 522c and 532c may be omitted.

The plurality of line portions 521a, 521b, 531a, and 531b have a predetermined width. For example, the first line portion 521a of the scan electrode 102 has a width of W1 and the second line portion 521b. ) Has a width of W2, the first line portion 531a of the sustain electrode 103 has a width of W3, and the second line portion 531b has a width of W4.

Here, W1, W2, W3, W4 may have substantially the same value, and one or more may have a different value. For example, the widths W1 and W3 of the first line portion 521a of the scan electrode 102 and the first line portion 531a of the sustain electrode 103 are approximately 35 μm, and the second line portion 521b is provided. 531b has a width W2 and W4 of 45 μm, and the widths W1 and W3 of the first line portion 521a of the scan electrode 102 and the first line portion 531a of the sustain electrode 103 are equal to each other. It may be smaller than the widths W2 and W4 of the two line portions 521b and 531b.

Meanwhile, the gap g3 between the first line portion 521a and the second line portion 521b of the scan electrode 102 and the first line portion 531a and the second line portion 531b of the sustain electrode 103 are described. If the interval g4 is excessively large, the discharge initiated between the scan electrode 102 and the sustain electrode 103 is caused by the second line portion 521b of the scan electrode 102 and the second line of the sustain electrode 103. It is difficult to diffuse smoothly to the portion 531b, whereas on the other hand, it is difficult to diffuse the discharge to the rear of the partitioned cell 112 partitioning the partition 112. Therefore, the gap g3 between the first line portion 521a and the second line portion 521b of the scan electrode 102 and between the first line portion 531a and the second line portion 531b of the sustain electrode 103. It may be preferable that the interval g4 is about 170 μm or more and 210 μm or less.

In addition, the line portions 521a and 521b of the scan electrode 102 in a direction parallel to the address electrode 113 in order to allow the discharge initiated between the scan electrode 102 and the sustain electrode 103 to sufficiently diffuse behind the discharge cell. And the shortest distance between and the partition wall 112, that is, the shortest distance g5 or address electrode in the direction parallel to the address electrode 113 between the second line portion 521b of the scan electrode 102 and the partition wall 112. The shortest distance between the line portions 531a and 531b of the sustain electrode 103 and the partition wall 112 in a direction parallel to the 113, that is, the second line portion 531b and the excess partition 112 of the sustain electrode 103. It is preferable that the shortest distance g6 in the direction parallel to the address electrode 113 between them is about 120 micrometers or more and 150 micrometers or less.

At least one of the protrusions 522a. 522b, 522c, 532a, 532b, and 532c protrudes from the line portions 521a, 521b, 531a, and 531b toward the center of the discharge cell partitioned by the partition wall 112. For example, protrusions 522a and 522b of the scan electrode 102 protrude from the first line portion 521a of the scan electrode 102 toward the discharge cell center, and numbers 532a and 532b of the sustain electrode 103 are the same. The protrusion may protrude from the first line portion 531a of the sustain electrode 103 toward the center of the discharge cell.

The protrusions 522a, 522b, 522c, 532a, 532b, and 532c are disposed to be spaced apart from each other by a predetermined distance. For example, the protrusion 522a of the scan electrode 102 and the protrusion 522b are spaced apart at interval g1, and the protrusion 532a of the sustain electrode 103 is spaced apart at interval g2.

Here, the intervals g1 and g2 between the protrusions 522a. 522b, 522c, 532a, 532b, and 532c are preferably 75 μm or more and 110 μm or less in order to ensure sufficient discharge efficiency.

In addition, the length of at least one of the protrusions 522a. 522b, 522c, 532a, 532b, and 532c may be different from the length of the other protrusions. Preferably, the length of the two protrusions different in the protruding direction may be different. For example, among the plurality of protrusions 522a, 522b, and 522c of the scan electrode 102, the lengths of the protrusions of the numbers 522a and 522b and the lengths of the protrusions of the number 522c are different from each other, and the plurality of protrusions of the sustain electrode 103 are different from each other. The lengths of protrusions 532a and 532b and the lengths of protrusions 532c of 532a, 532b, and 532c may be different from each other.

In addition, the scan electrode 102 and the sustain electrode 103 may include connecting parts 523 and 533 connecting at least two line parts of the plurality of line parts 521a, 521b, 531a, and 531b. For example, a connecting portion 523 connecting the first line portion 521a and the second line portion 521b of the scan electrode 102, and the first line portion 531a and the second line portion of the sustain electrode 103 ( It may further include a connection portion 533 for connecting the 531b.

Between the protrusions 522a and 522b protruding from the first line portion 521a of the scan electrode 102 and the protrusions 532a and 532b protruding from the first line portion 531a of the sustain electrode 103. Discharge may be initiated.

The discharge discharged is diffused into the first line portion 521a of the scan electrode 102 and the first line portion 531a of the sustain electrode 103, and is connected to the first and second portions 521 and 533 of the scan electrode 102. It may be diffused into the second line portion 521b and the second line portion 531b of the sustain electrode 103.

In addition, the discharge diffused to the second line portions 521b and 531b may further diffuse to the rear of the discharge cell on the protrusion 522c of the scan electrode 102 and the protrusion 532c of the sustain electrode 103.

Next, referring to FIG. 5B, at least one of the plurality of protrusions 521a, 521b, 521c, 531a, 531b, and 531c of the scan electrode 102 and the sustain electrode 103 may have a curvature. Preferably, at least one end portion of the plurality of protrusions 521a, 521b, 521c, 531a, 531b, and 531c may have a curvature.

It is also possible that the portions where the protrusions 521a, 521b, 521c, 531a, 531b, and 531c and the line portions 521a, 521b, 531a, and 531b have a curvature.

It is also possible that the portion where the line portions 521a, 521b, 531a, and 531b and the connecting portions 523 and 533 are connected has a curvature.

As such, when a portion of the scan electrode 102 and the sustain electrode 103 are formed to have a curvature, the manufacturing process of the scan electrode 102 and the sustain electrode 103 may be easier. In addition, it is possible to prevent excessive concentration of wall charges in a specific position during driving, thereby making it possible to stabilize driving.

On the other hand, when the scan electrode and the sustain electrode has a single layer structure as described above, the discharge voltage between the scan electrode and the sustain electrode is increased, thereby driving efficiency and brightness can be reduced. This will be described with reference to FIG. 6 attached thereto.

6 is a diagram for explaining the relationship between the single-layer electrode structure and color reproducibility.

Referring to FIG. 6, (a) shows an example in which the scan electrode 701 and the sustain electrode 702 have a plural layer structure, and (b) shows the scan electrode 703 and the sustain electrode 704 in a single layer structure. It is an example of having.

Comparing the cases of (a) and (b), the case of (b) has a single layer structure, whereas in the case of (a), the scan electrode 701 and the sustain electrode 702 are transparent electrodes 701a and 702a. ) And bus electrodes 701b and 702b.

As described above, in the case of (a), since the scan electrode 701 and the sustain electrode 702 include the transparent electrodes 701a and 702a, the luminance of the image may not decrease even if the total area is increased. On the other hand, in the case of (b), since the transparent electrode is omitted, excessively increasing the area of the scan electrode 703 and the sustain electrode 704 causes excessive reduction of the aperture ratio of the panel, resulting in excessive luminance of the image. Can be reduced.

That is, in the case of (a), since the transparent electrodes 701a and 702a are included, the areas of the transparent electrodes 701a and 702a are increased to increase the areas of the scan electrode 701 and the sustain electrode 702. As a result, the driving voltage may be reduced, thereby improving driving efficiency. In this case, the panel aperture ratio does not decrease. On the other hand, in the case of (b), if the area of the scan electrode 703 and the sustain electrode 704 is increased, the driving voltage can be lowered. The luminance is excessively lowered.

Therefore, in order to prevent the luminance of an image from being excessively reduced when the scan electrode 703 and the sustain electrode 704 have a single layer structure as shown in (b), the scan electrode 703 and the sustain electrode 704 are prevented. ) Should be made relatively small. For this reason, when the scan electrode 703 and the sustain electrode 704 have a single layer structure as in (b), the spread of the discharge may be weaker than in the case of (a).

That is, when the scan electrode 703 and the sustain electrode 704 have a single layer, the discharges initiated between the scan electrode 703 and the sustain electrode 704 are not sufficiently diffused to the outside of the discharge cell as compared with the case of the multilayer structure. Accordingly, the portion in which the visible light is generated in the discharge cell may not be widely distributed and may be biased in a specific region. Therefore, the color of the implemented image may be degraded. In other words, when the scan electrode 703 and the sustain electrode 704 are a single layer, color reproducibility may be deteriorated.

In order to prevent such degradation in color reproducibility, it may be preferable that the first phosphor layer includes a YVPO ₄ : Eu material as the first phosphor material. This will be described with reference to FIG. 7.

7 is a view for explaining a phosphor material.

Referring to FIG. 7, the second phosphor layer emitting blue light includes a second phosphor material having a white-based color.

Here, the material of the second phosphor is not particularly limited except for emitting blue light, but may be (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ when considering the luminous efficiency of the blue light.

The third phosphor layer emitting green light includes a third phosphor material having a white-based color.

Here, the third phosphor material is not particularly limited except for emitting green light, but may include Zn ₂ Si ₄ : Mn ⁺² and YBO ₃ : Tb ⁺³ when considering the luminous efficiency of the green light.

The first phosphor layer that emits red light includes a first phosphor material having a white-based color.

Here, the first phosphor material is YVPO ₄ : Eu which emits red light. YVPO ₄ : Eu has a higher emission efficiency of red light than other phosphor materials emitting red light, such as (Y, Gd) BO: Eu, thereby improving color of an image. That is, color reproducibility can be improved. This will be described with reference to FIG. 8.

8 is a view for explaining the color coordinate characteristics of the plasma display panel according to an embodiment of the present invention.

8, the first phosphor material is YVPO ₄ : Eu, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , and the third phosphor material is Zn ₂ Si0 ₄ : Mn ⁺² and YBO ₃ : Tb. The first type panel (Type 1) in which ⁺³ is mixed at a ratio of 5: 5, the first phosphor material is (Y, Gd) BO: Eu, and the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , and the third phosphor material is a Zn ₂ Si0 ₄ : Mn ⁺² and YBO ₃ : Tb ⁺³ in a ratio of 5: 5 to prepare a second type panel (Type 2), respectively While displaying the same image on the panel of the graph is shown a graph measuring the color coordinates using the MCPD-1000 device.

Referring to FIG. 8, in the second type, the color coordinate P1 of the green color G is approximately 0.276 in the X axis and approximately 0.656 in the Y axis. The color coordinate P2 of the red color R is approximately 0.630 in the X axis and approximately 0.362 in the Y axis. In addition, the color coordinate P3 of the blue color B is approximately 0.157 in the X axis and approximately 0.100 in the Y axis.

On the other hand, in the case of the first type panel, the color coordinate P10 of green G is about 0.274 in the X axis and about 0.655 in the Y axis. In addition, the color coordinate P20 of the red color R is approximately 0.645 in the X axis and approximately 0.350 in the Y axis. The color coordinate P30 of the blue color B is approximately 0.158 in the X axis and approximately 0.095 in the Y axis.

Here, it can be seen that the area of the triangle connecting P10, P20, and P30 of the first type panel is larger than that of the triangle connecting P1, P2, and P3 of the second type panel. This is because the first type panel includes YVPO ₄ : Eu as the first phosphor material, and the red expressive power is improved as compared to the second type panel including (Y, Gd) BO: Eu as the first phosphor material. It means better reproducibility.

Indeed, depending on the viewer's taste, there is a slight difference, but (Y, Gd) BO: Eu emits red light close to orange, and YVPO ₄ : Eu is more red than (Y, Gd) BO: Eu Emit light.

As described above, when the scan electrode and the sustain electrode have a single layer structure, the discharge cannot be sufficiently diffused, and color reproducibility may be reduced. When YVPO ₄ : Eu is included as the first phosphor material, As a result, color reproducibility that is decreased can be compensated for, thereby improving image quality.

9 is a diagram for explaining another example of the phosphor layer.

Referring to FIG. 9, the phosphor layer may include a pigment.

For example, the first phosphor layer emitting red light includes a first phosphor material having a white color and a pigment.

The pigment included in the first phosphor layer may have a reddish color and may be mixed with the first phosphor material so that the first phosphor layer has a reddish color. The pigment is not particularly limited except that the color is red-based, but may include iron (Fe) material in consideration of ease of powder manufacturing, color, manufacturing cost.

The iron (Fe) material may be in the state of iron oxide in the first phosphor layer. For example, the iron (Fe) material may be αFe ₂ O ₃ in the first phosphor layer. May exist in a state.

As such, when the first phosphor layer includes a pigment, the first phosphor layer may appear red in the viewer's eyes, and red may be further emphasized in the image. Therefore, red color reproducibility can be further improved.

In addition, when the first phosphor layer includes a pigment, a red pigment absorbs light incident from the outside, thereby lowering a panel reflectance and improving contrast characteristics of an image implemented therein.

In addition, the second phosphor layer emitting blue light may include a second phosphor material having a white color and a pigment.

The pigment included in the second phosphor layer may have a blue color, and may be mixed with the second phosphor material so that the second phosphor layer has a blue color. The pigment is not particularly limited except that the color is blue, but considering the ease of powder manufacture, color, and production cost, cobalt (Co), copper (Cu), chromium (Cr), or It may include at least one of nickel (Ni) material.

At least one of the cobalt (Co) material, copper (Cu) material, chromium (Cr) material, or nickel (Ni) material may be in a metal oxide state in the second phosphor layer. For example, in the case of cobalt (Co) material, CoAl ₂ O ₄ in the second phosphor layer. May exist in a state.

As such, when the second phosphor layer includes a pigment, the second phosphor layer may appear blue to the viewer's eyes, and blue may be more emphasized in the image thus implemented. Therefore, the color reproducibility of blue can be further improved.

In addition, when the second phosphor layer includes a pigment, the blue pigment absorbs light incident from the outside, thereby lowering the panel reflectance and further improving contrast characteristics of the image.

10 is a view for explaining color coordinate characteristics when the phosphor layer contains a pigment.

10, the first phosphor material is YVPO ₄ : Eu, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , and the third phosphor material is Zn ₂ Si0 ₄ : Mn ⁺² and YBO ₃ : Tb. ⁺³ is mixed at a ratio of 5: 5, and the first phosphor layer contains 0.2 parts by weight of iron (Fe) material as a red pigment, and the second phosphor layer contains cobalt (Co) material as 1 blue pigment. The first type panel (Type 1) including parts by weight, the first phosphor material is (Y, Gd) BO: Eu, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , the third phosphor The material is a mixture of Zn ₂ Si0 ₄ : Mn ⁺² and YBO ₃ : Tb ⁺³ in a ratio of 5: 5, and the first phosphor layer, the second phosphor layer, and the third phosphor layer all contain no pigment. A graph of color coordinate measurements using the MCPD-1000 is shown while creating a Type 2 panel and displaying the same image on each panel.

Referring to FIG. 10, in the second type, the color coordinate P1 of the green color G is approximately 0.274 in the X axis and approximately 0.655 in the Y axis. The color coordinate P2 of the red color R is approximately 0.645 on the X axis and approximately 0.350 on the Y axis. The color coordinate P3 of the blue color B is approximately 0.158 in the X axis and approximately 0.080 in the Y axis.

On the other hand, in the case of the first type panel, the color coordinate P10 of green G is about 0.272 on the X axis and about 0.653 on the Y axis. In addition, the color coordinate P20 of the red color R is approximately 0.649 on the X axis and approximately 0.349 on the Y axis. In addition, the color coordinate P30 of blue (B) is approximately 0.156 in the X axis, and approximately 0.090 in the Y axis.

Here, it can be seen that the area of the triangle connecting P10, P20, and P30 of the first type panel is larger than that of the triangle connecting P1, P2, and P3 of the second type panel. This is because the first type panel has a first phosphor layer containing iron (Fe) as a red pigment and the second phosphor layer contains a cobalt (Co) material as a blue pigment, whereby the pigment is omitted. Compared with the panel, the expressive power of blue and red is improved, which means that the color reproducibility is better.

As described above, in the case where the scan electrode and the sustain electrode have a single layer structure, discharge may not be sufficiently diffused, and color reproducibility may be reduced. When the phosphor layer contains a pigment, the color reproducibility decreases according to the single layer structure. Can compensate.

11A to 11B are diagrams for explaining reflectances of the first phosphor layer and the second phosphor layer.

In FIG. 11A, a 7-inch test model including a first phosphor layer emitting red light in all discharge cells is fabricated, and light is directly irradiated onto the barrier rib and the first phosphor layer in a state where the front substrate is removed. The measured data is shown.

Here, the first phosphor material is (Y, Gd) BO: Eu, and the red pigment included in the first phosphor layer is an iron (Fe) material, and the iron (Fe) material is made of αFe ₂ O ₃ . 1 It is mixed with phosphor material.

① is the case where the first phosphor layer does not contain a red pigment, ② is the case where the first phosphor layer contains 0.1 parts by weight of red pigment, and ③ is the case where the first phosphor layer contains 0.5 parts by weight of the red pigment. to be.

Referring to FIG. 11A, when the red pigment is not mixed in the first phosphor layer as in ①, the reflectance is 75% or more in all wavelength bands from 400 nm to 750 nm. As such, the reason why the reflectance is high when the red pigment is omitted is that most of the first phosphor material having a white-based color reflects incident light.

As shown in (2), when 0.1 parts by weight of red pigment is mixed in the first phosphor layer, the reflectance is about 60% or less in the wavelength range of 400 nm to 550 nm, and the reflectance is about 60% or more and 75% or less in the wavelength range of 550 nm or more. to be.

As shown in Fig. 3, when 0.5 parts by weight of red pigment is mixed in the first phosphor layer, the reflectance is about 50% or less in the wavelength range of 400 nm to 550 nm, and the reflectance is about 50% or more and 70% or less in the band where the wavelength is 550 nm or more. to be.

As described above, the reason why the reflectance decreases when the red pigment is mixed with the first phosphor layer is because the red pigment having the red-based color absorbs the incident light.

In FIG. 11B, a 7-inch test model in which a second phosphor layer emitting blue light is disposed in all of the discharge cells is fabricated, and the reflectance is measured by directly irradiating light on the barrier rib and the second phosphor layer with the front substrate removed. The data is shown.

Here, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , and the blue pigment included in the second phosphor layer is cobalt (Co) material, and the cobalt (Co) material is CoAl ₂ O ₄ It is mixed with the 2nd phosphor material in a state.

① is the case where the second phosphor layer does not contain a blue pigment, ② is the case where the second phosphor layer contains 0.1 parts by weight of blue pigment, and ③ is the case where the second phosphor layer contains 1.0 parts by weight of the blue pigment. to be.

Referring to FIG. 11B, when the blue pigment is not mixed in the second phosphor layer as in ①, the reflectance is about 72% or more in all wavelength bands from 400 nm to 750 nm. As such, the reason why the reflectance is high when the blue pigment is omitted is that the second phosphor material having a white-based color reflects most of the incident light.

As shown in (2), when 0.1 part by weight of blue pigment is mixed in the second phosphor layer, the reflectance is approximately 74% or more in the wavelength band from 400 nm to 510 nm, and the reflectance is approximately 60% in the band in the wavelength range from 510 nm to 650 nm. Decreases and rises to approximately 72%.

When 1.0 parts by weight of blue pigment is mixed in the second phosphor layer as in?, The reflectance is at least 50% or less in the wavelength range from 510 nm to 650 nm.

As described above, the reason why the reflectance decreases when the blue pigment is mixed with the second phosphor layer is because the blue pigment having the blue-based color absorbs the incident light.

As such, when the reflectance is decreased, contrast characteristics of the image to be implemented may be improved, and thus image quality of the image may be improved.

An example of the method of manufacturing the phosphor layer described above is as follows. Here, the manufacturing method of a 1st fluorescent substance layer is demonstrated as an example.

First, a powder of a first phosphor material of (Y, Gd) BO: Eu and a powder of a red pigment of αFe ₂ O ₃ are mixed with a binder and a solvent to form a phosphor paste. Here, it is also possible to mix with a binder and a solvent in the state which mixed the red pigment with gelatin. In this case, the viscosity of the phosphor paste may be about 1500CP or more and 30000CP or less. Surfactant, silica, dispersion stabilizer, etc. can be further added to an fluorescent paste as needed as an additive.

At this time, the binder used is not particularly limited, but may be an ethyl cellulose or acrylic resin-based, or a polymer-based binder such as PMA or PVA. The solvent is not particularly limited, but α-terpineol, butyl carbitol, diethylene glycol, methyl ether and the like can be used.

The first phosphor layer may be formed by applying a phosphor paste into a discharge cell partitioned by a partition wall and undergoing a drying or firing process.

12A to 12B are views for explaining the relationship between the content of the red pigment, the reflectance and the luminance.

12A to 12B, a first phosphor layer is disposed in a red (R) discharge cell, a second phosphor layer is disposed in a blue (B) discharge cell, and a third phosphor layer is disposed in a green (G) discharge cell. , Reflectance and brightness are measured while changing the content of the red pigment mixed in the first phosphor layer in a state in which 1.0 parts by weight of the blue pigment is mixed in the second phosphor layer. Here, panel reflectance and luminance are measured in a panel state where the front substrate and the rear substrate are joined.

Here, the first phosphor material is (Y, Gd) BO: Eu, the red pigment is iron (Fe) material, and the iron (Fe) material is mixed with the first phosphor material in the state of αFe ₂ O ₃ .

In addition, the second phosphor material is (Ba, Sr, Eu) MgAl ₁₀ O ₁₇ , the blue pigment is a cobalt (Co) material, this cobalt (Co) material is CoAl ₂ O ₄ It is mixed with the 2nd phosphor material in a state.

12A, 1) is a case where the first phosphor layer does not include a red pigment in a state where the second phosphor layer contains 1.0 parts by weight of blue pigment, and 2) a second phosphor layer contains 1.0 part by weight of a blue pigment. In this case, the first phosphor layer contains 0.1 parts by weight of the red pigment, and (3) indicates that the first phosphor layer contains 0.5 parts by weight of the red pigment in a state in which the second phosphor layer contains 1.0 parts by weight of the blue pigment. If it is.

In the case where the red pigment is not mixed in the first phosphor layer as in?, The panel reflectance increases from approximately 33% to 38% between 400 nm and 550 nm. In addition, when the wavelength is 550 nm or more, the panel reflectance drops to approximately 33%.

In the band of 500 nm or more and 600 nm or less, the reflectance has a high value of approximately 37% or more and 38% or less.

As such, when the red pigment is omitted, the panel reflectance is relatively high even when the second phosphor layer is mixed with the second phosphor layer because the first phosphor material having the white color reflects most of the incident light.

On the other hand, when 0.1 parts by weight of red pigment is mixed in the first phosphor layer as shown in (2), the reflectance is approximately 34% or less in all the wavelength bands from 400 nm to 750 nm, and the reflectance is approximately even in the band where the wavelength is 500 nm or more and 600 nm or less. It has a relatively small value of 33% or more and 34% or less.

In addition, in the case where 0.5 parts by weight of red pigment is mixed in the first phosphor layer as shown in (3), the reflectance has a value of approximately 24% to 31.5% in the wavelength range of 400 nm to 650 nm, and the wavelength is 650 nm or more and 750 nm or less. In the band, the reflectance decreases below 30%.

In addition, even in a band having a wavelength of 500 nm or more and 600 nm or less, the reflectance has a small value of approximately 27.5% or more and 29.5% or less.

As described above, it can be seen that as the content of the red pigment increases, the panel reflectance decreases.

In addition, in the band of 500 nm or more and 600 nm or less, it can be seen that the difference between the reflectance when the red pigment is not included as in ① and the reflectance when the red pigment is included as ② or ③ is relatively large.

The wavelength range of 500nm or more and 600nm or less is mainly red, orange, and yellow in visible light. Therefore, the high reflectance of 500nm or more and 600nm or less can mean that the color of the image is closer to red. have. In this case, the color temperature is relatively low, so that the viewer can easily feel eye fatigue, and the image may not be clear.

On the other hand, the low reflectance in the wavelength range of 500 nm or more and 600 nm or less, preferably 550 nm, has a high absorption rate of light of red, orange, and yellow, and thus the color temperature of the image is relatively high. You can feel more clearly.

Therefore, the difference between the reflectance when the red pigment is not included as in ① and the red pigment as when ② or ③ is relatively large in the wavelength band of 500 nm to 600 nm is relatively large in the first phosphor layer. Even mixing the red pigment having a red-based color may mean that the color temperature can be prevented from being excessively lowered.

In consideration of the above description, it may be desirable to improve the color temperature characteristic odor by setting the panel reflectance to 30% or less in the wavelength range of 550 nm, which may be a reference for the wavelength band of 500 nm to 600 nm.

Next, in FIG. 12B, the content of the blue pigment included in the second phosphor layer is fixed, and the luminance of the same image is measured while changing the content of the red pigment included in the first phosphor layer.

12B, the luminance of the image implemented when the red phosphor is not included in the first phosphor layer is approximately 176 [cd / m ² ].

When the content of the red pigment included in the first phosphor layer is 0.01 part by weight, the luminance of the image to be implemented is approximately 175 [cd / m ² ]. As such, the reason why the brightness of the image decreases when the red pigment is mixed is that the particles of the red pigment cover a part of the surface of the particles of the first phosphor material, whereby the particles of the red pigment are discharged in the discharge cell. This is because the generated ultraviolet rays prevent the irradiation of the particles of the first phosphor material.

When the content of the red pigment is between 0.1 parts by weight and 3 parts by weight, the luminance of the image to be realized has a stable value between approximately 168 [cd / m ² ] and 174 [cd / m ² ].

In addition, when the content of the red pigment is between 3 parts by weight and 5 parts by weight, the luminance of the implemented image has a value of approximately 160 [cd / m ² ] to 168 [cd / m ² ].

On the other hand, when the content of the red pigment is 6 parts by weight or more, the content of the red pigment included in the first phosphor layer may be excessive, and thus the area covered by the red pigment particles on the particle surface of the first phosphor material. By this excessive increase, the luminance of the image to be implemented is drastically reduced below approximately 149 [cd / m ² ].

12A to 12B, the content of the red pigment in the first phosphor layer may be preferably 0.01 parts by weight or more and 5 parts by weight or less in order to prevent excessive decrease in luminance while reducing reflectance. More preferably, it may be 0.1 parts by weight or more and 3 parts by weight or less.

13A to 13B are views for explaining the relationship between the content of the blue pigment, the reflectance and the luminance. Here, in FIG. 13A to FIG. 13B, descriptions of contents overlapping with those of FIGS. 12A to 12B will be omitted.

13A to 13B, a first phosphor layer is disposed in a red (R) discharge cell, a second phosphor layer is disposed in a blue (B) discharge cell, and a third phosphor layer is disposed in a green (G) discharge cell. And reflectance and brightness are measured while varying the content of the blue pigment mixed in the second phosphor layer in a state in which 0.2 parts by weight of the red pigment is mixed in the first phosphor layer. Here, panel reflectance and luminance are measured in a panel state where the front substrate and the rear substrate are joined.

The remaining conditions are substantially the same as in the case of Figs. 12A to 12B.

Referring to Figure 13a, ① is a case where the second phosphor layer does not contain a blue pigment in a state where the first phosphor layer contains 0.2 parts by weight of red pigment, and ② is a first phosphor layer contains 0.2 parts by weight of red pigment. The second phosphor layer contains 0.1 parts by weight of the blue pigment in the state, and (3) is when the second phosphor layer contains 0.5 parts by weight of the blue pigment in the state where the first phosphor layer contains 0.2 part by weight of the red pigment. ④ is the case where the second phosphor layer contains 3 parts by weight of blue pigment while the first phosphor layer contains 0.2 parts by weight of red pigment, and ⑤ is the first phosphor layer contains 0.2 parts by weight of red pigment. It is a case where a 2nd fluorescent substance layer contains 7 weight part of blue pigments in a state.

When the blue pigment is not mixed with the second phosphor layer as in?, The panel reflectance increases from approximately 35% to 40.5% between 400 nm and 550 nm. In addition, when the wavelength is 550 nm or more, the panel reflectance drops to approximately 35.5%.

In the band of 500 nm to 600 nm, the reflectance has a high value of approximately 39% to 40.5%.

As such, when the blue pigment is omitted, the panel reflectance is relatively high even when the red pigment is mixed in the first phosphor layer because the second phosphor material having a white-based color reflects most of the incident light.

On the other hand, when 0.1 parts by weight of blue pigment is mixed in the second phosphor layer as shown in (2), the reflectance is approximately 38% or less in all the wavelength bands of 400nm to 750nm, and the reflectance is also approximately in the band of 500nm or more and 600nm or less It has a relatively small value of 34% or more and 37% or less.

In addition, in the case where 0.5 parts by weight of the blue pigment is mixed in the second phosphor layer as in e. In the band, the reflectance is about 28% to 32.5%.

In addition, even in a band having a wavelength of 500 nm to 600 nm, the reflectance has a small value of approximately 28% to 29%.

In addition, in the case where 3 parts by weight of blue pigment are mixed in the second phosphor layer as shown in (4), the reflectance is in the range of approximately 22.5% to 29% in the wavelength range from 400nm to 650nm, and the wavelength is from 650nm to 750nm. In the band, the reflectivity ranges from approximately 29% to 31%.

In addition, in the band of 500 nm or more and 600 nm or less, the reflectance has a small value of approximately 26.5% or more and 28% or less.

In addition, when 7 parts by weight of blue pigment are mixed in the second phosphor layer as shown in ⑤, the reflectance is in the range of about 25% to 28% in the wavelength range of 400 nm to 700 nm, and the reflectance in the band of wavelength 700 nm or more. This has a value between approximately 28% and 30%.

Next, in FIG. 13B, the content of the red pigment included in the first phosphor layer is fixed, and the luminance of the same image is measured while changing the content of the blue pigment included in the second phosphor layer.

Referring to FIG. 13B, the luminance of the image implemented when the blue phosphor is not included in the second phosphor layer is approximately 176 [cd / m ² ] in luminance.

When the content of the blue pigment included in the second phosphor layer is 0.01 parts by weight, the luminance of the image to be implemented is approximately 175 [cd / m ² ].

When the content of the blue pigment is 0.1 parts by weight, the luminance of the implemented image is approximately 172 [cd / m ² ].

When the content of the blue pigment is between 0.5 parts by weight and 4 parts by weight, the luminance of the implemented image has a stable value between approximately 164 [cd / m ² ] and 170 [cd / m ² ].

In addition, when the content of the blue pigment is between 4 parts by weight and 5 parts by weight, the luminance of the implemented image has a value of approximately 160 [cd / m ² ] to 164 [cd / m ² ].

On the other hand, when the content of the blue pigment exceeds 6 parts by weight, the content of the blue pigment included in the second phosphor layer may be excessive, and thus the area covered by the particles of the blue pigment on the particle surface of the second phosphor material may be By excessively increasing, the luminance of the image to be implemented is drastically reduced to about 148 [cd / m ² ] or less.

13A to 13B described above, the content of the second blue pigment in the second phosphor layer may be preferably 0.01 part by weight or more and 5 parts by weight or less in order to reduce the reflectance while preventing excessive decrease in luminance. It may be more preferably 0.5 parts by weight or more and 4 parts by weight or less.

14 is a diagram for explaining an upper dielectric layer.

Referring to FIG. 14, the upper dielectric layer includes a glass material and a pigment, and the pigment has a blue-based color.

Glass material is not particularly limited, but P ₂ O ₆ -B ₂ O ₃ -ZnO-based glass, ZnO-B ₂ O ₃ -RO (RO is BaO, SrO, La ₂ O ₃ , Bi ₂ O ₃ , P ₂ O ₃ , SnO) based glass, ZnO-BaO-RO (RO is SrO, La ₂ O ₃ , Bi ₂ O ₃ , P ₂ O ₃ , SnO) based glass, ZnO-Bi ₂ O ₃ − RO (RO may be any one of SrO, La ₂ O ₃ , P ₂ O ₃ , SnO) -based glass material, or a mixture of two or more thereof.

The pigment is not particularly limited except that the pigment is included in the upper dielectric layer so that the upper dielectric layer has a blue-based color, but cobalt is considered in consideration of ease of powder manufacturing, color, manufacturing cost, and reflectance of the upper dielectric layer. It may be desirable to include (Co) materials.

An example of a method of manufacturing the upper dielectric layer is as follows.

First, the glass material and the pigment are mixed. For example, a cobalt (Co) material can be mixed as a P ₂ O ₆ -B ₂ O ₃ -ZnO-based glass material and a blue pigment.

Thereafter, the glass is manufactured using the glass material in which the pigment is mixed. Here, blue glass having a blue-based color may be manufactured by cobalt (Co).

Thereafter, the prepared blue glass is crushed to prepare a blue glass powder. Here, it may be preferable that the particle size of the glass powder is about 0.1 μm (micrometer) or more and 10 μm (micrometer) or less.

Thereafter, the blue glass powder may be mixed with a binder, a solvent, or the like to prepare a dielectric paste. At this time, an additive such as a dispersion stabilizer may be further added to the dielectric paste.

Subsequently, the dielectric paste may be applied to the front substrate on which the scan electrode Y and the sustain electrode Z are formed, and the applied dielectric paste may be dried or baked to form an upper dielectric layer.

The upper dielectric layer formed in this way may have a blue based color.

In the above, only one example of a method of forming the upper dielectric layer is described, and the present invention is not limited thereto. For example, the upper dielectric layer may be formed through a laminating method.

As described above, when the upper dielectric layer includes a cobalt (Co) material as a pigment, it is possible to improve the color reproducibility of blue in the image to be implemented.

In more detail, when YVPO ₄ : Eu is included as the first phosphor material, red color reproducibility may be improved even if the scan electrode and the sustain electrode have a single layer structure. Here, when the upper dielectric layer includes a cobalt (Co) material as a pigment, not only red but also blue color reproducibility may be improved together, thereby further improving image quality.

FIG. 15 is a diagram for describing color coordinate characteristics when the upper dielectric layer includes a pigment.

In FIG. 15, a first type panel Type 1 containing 0.2 parts by weight of a cobalt (Co) material as a pigment in the upper dielectric layer and a second type panel (Type 2) containing no pigment in the upper dielectric layer are fabricated. Figure 2 shows a graph of color coordinate measurements using the MCPD-1000 while displaying the same image on each panel. Here, the remaining conditions of the first type panel and the second type panel are substantially the same as in the case of FIG. 10.

Referring to FIG. 15, in the second type, the color coordinate P1 of green G is about 0.272 on the X axis and about 0.653 on the Y axis. The color coordinate P2 of the red color R is approximately 0.649 on the X axis and approximately 0.349 on the Y axis. In addition, the color coordinate P3 of the blue color B is approximately 0.156 in the X axis and approximately 0.090 in the Y axis.

On the other hand, in the case of the first type panel, the color coordinate P10 of green G is about 0.272 on the X axis and about 0.651 on the Y axis. In addition, the color coordinate P20 of red (R) is approximately 0.640 in the X axis, and approximately 0.338 in the Y axis. In addition, the color coordinate P30 of blue (B) is approximately 0.135 in the X-axis, and approximately 0.050 in the Y-axis.

As illustrated in FIG. 15, triangles connecting P10, P20, and P30 of the first type panel may be more oriented in the origin direction than triangles connecting P1, P2, and P3 of the second type panel. This may mean that the first type panel has a better color reproducibility of blue than the second type panel, and accordingly, the color temperature is higher, so that the image quality of the image is excellent.

On the other hand, when the content of the cobalt (Co) material included as a pigment in the upper dielectric layer is excessively high, the luminance of the image to be realized may be excessively reduced by reducing the transmittance of the upper dielectric layer, while cobalt (Co) When the content of the material is excessively small, the effect of improving color temperature and improving color reproducibility may be insignificant.

In addition, when the content of cobalt (Co) included as a pigment in the upper dielectric layer is constant, if the thickness of the upper dielectric layer is increased, the reflectance is reduced to improve the contrast characteristic, but the transmittance may be reduced to reduce the luminance of the image to be realized. have. In addition, when the thickness of the upper dielectric layer is constant, if the content of the cobalt (Co) material is increased, the reflectance is reduced to improve the contrast characteristic, but the transmittance may be reduced to reduce the brightness of the image.

Therefore, in order to increase the transmittance while lowering the reflectance, it may be desirable to determine the thickness of the upper dielectric layer according to the content of cobalt (Co) included as a pigment. This is as follows.

16 is a diagram for explaining the relationship between the content of cobalt and the thickness of the upper dielectric layer.

FIG. 16 shows reflectance and transmittance data according to a change in the ratio T / C of the thickness T of the upper dielectric layer and the content C of the cobalt (Co) material.

The thickness of the upper dielectric layer is T, the unit is [μm], the content of cobalt material is C, and the unit is [weight parts].

Type A is a data of measuring the reflectance and transmittance while changing the T / C from 10 to 500 by setting the thickness of the upper dielectric layer to 39 μm and 33 μm and changing the content of cobalt (Co) material.

Type B is the data of measuring the reflectance and transmittance while changing the T / C from 10 to 500 by setting the content of cobalt (Co) to 0.1 parts by weight and 0.6 parts by weight, and changing the thickness of the upper dielectric layer.

? Indicates that the reflectance is sufficiently low or sufficiently high that the transmittance is very good,? Indicates relatively good, and X indicates that the reflectivity is excessively high or the transmittance is too low and very poor.

First, looking at the side of the A-type reflectivity, the reflectance is very good (◎) when the T / C is 10 or more and 330 or less. The reason is that the content (C) of the cobalt (Co) material is sufficiently higher than the thickness (T) of the dielectric layer, and thus the reflectance of the dielectric layer is sufficiently high.

In this case, assuming that the thickness T of the dielectric layer is 33 μm, the content of cobalt (Co) material is sufficiently large, approximately 0.1 part by weight or more and 3.3 parts by weight or less. Then, the reflectance can be sufficiently high and the contrast characteristic can be improved.

Moreover, when T / C is 390 or more and 480 or less, the reflectance is relatively good ((circle)). In this case, although the reflectance is low, the contrast characteristic may deteriorate, but the degree may be insignificant.

On the other hand, when T / C is 500 or more, the reflectance is very poor (X). This is because the content (C) of the cobalt (Co) material is excessively small compared to the thickness (T) of the dielectric layer, and thus the reflectivity of the dielectric layer is excessively low.

In this case, assuming that the thickness T of the dielectric layer is 39 μm, the content of cobalt (Co) material is excessively small, about 0.078 parts by weight or less. Then, the reflectance becomes excessively low, and thus the contrast characteristic may deteriorate.

In addition, looking at the side of the A-type transmittance, the transmittance is very poor (X) when the T / C is 10 or more and 30 or less. This is because the content (C) of the cobalt (Co) material is excessively large compared to the thickness (T) of the dielectric layer, and thus the transmittance of the dielectric layer is sufficiently low.

On the other hand, when T / C is 40 or more and 80 or less, the transmittance is relatively good (○). In this case, the transmittance is low, but the luminance of the image may be reduced, but the degree may be insignificant.

In addition, when T / C is 110 or more, the transmittance is very good (?). This is because the content (C) of the cobalt (Co) material is sufficiently low compared to the thickness (T) of the dielectric layer, and thus the transmittance of the dielectric layer is sufficiently high.

Next, looking at the side of the B-type reflectivity, when T / C is 10, the reflectance is very poor (X). The reason is that the thickness T of the dielectric layer is excessively thin compared to the content of the cobalt (Co) material, and thus the reflectivity of the dielectric layer is excessively low.

In this case, assuming that the content of cobalt (Co) material is 0.1 parts by weight, the thickness T of the upper dielectric layer is excessively thin, approximately 1 μm. Then, the reflectance may be excessively low and the contrast characteristic may deteriorate.

On the other hand, when the T / C is 30 or more and 60 or less, the reflectance is relatively good (○). In this case, although the reflectance is low, the contrast characteristic may be degraded, but the degree may be insignificant.

In addition, when T / C is 80 or more, the reflectance is very good (?). This is because the thickness T of the dielectric layer is sufficiently thick compared to the content of the cobalt (Co) material, and thus the reflectance of the dielectric layer is sufficiently high.

In this case, assuming that the content C of cobalt (Co) is 0.6 parts by weight, the thickness T of the upper dielectric layer is sufficiently thick, not less than 48 µm and not more than 300 µm. Then, the reflectance can be sufficiently high and the contrast characteristic can be improved.

Next, looking at the transmittance side of the B type, the transmittance is very good (◎) when the T / C is 10 or more and 260 or less. The reason is that the thickness T of the dielectric layer is sufficiently thin compared with the content of the cobalt (Co) material, and thus the transmittance of the dielectric layer is sufficiently high.

Moreover, when T / C is 290 or more and 420 or less, transmittance | permeability is comparatively favorable ((circle)). In this case, the transmittance is low, but the luminance of the image may be reduced, but the degree may be insignificant.

On the other hand, when the T / C is 480 or more, the transmittance is very poor (X). This is because the thickness T of the dielectric layer is excessively thick compared to the content of the cobalt (Co) material, and thus the transmittance of the dielectric layer is excessively low.

In consideration of the data of FIG. 16 described above, the thickness T of the upper dielectric layer may be preferably according to Equation 1 below.

Equation 1: 40 ≤ T / C ≤ 420

Further, preferably, the thickness T of the upper dielectric layer may be according to Equation 2 below.

Equation 2: 110 ≤ T / C ≤ 260

17A to 17B are views for explaining the content of the first blue pigment in more detail.

17A to 17B, the content of cobalt material (Co) included in the upper dielectric layer is 0 part by weight, 0.05 part by weight, 0.1 part by weight, 0.15 part by weight, 0.2 part by weight, 0.3 part by weight, 0.5 part by weight, and 0.6 part by weight. In each case of 0.7 parts by weight and 1.0 parts by weight, data obtained by measuring darkroom contrast (C / R), bright room contrast, reflected light, reflectance, color temperature, luminance, and the like are shown. At this time, the thickness T of the upper dielectric layer was all the same as 38 μm, and the first phosphor layer contained 0.2 parts by weight of red pigment.

Dark room contrast is a contrast measurement in a dark dark room with a 1% window pattern image displayed on the screen.

Clear room contrast is the contrast measured with a 25% window pattern displayed on the screen in bright ambient light.

Referring to FIG. 17A, when the content of the cobalt (Co) material is 0 parts by weight, that is, when the first blue pigment is not included in the upper dielectric layer, the darkroom contrast is 10500: 1, and the clear room contrast is 50: 1. The reflected light is 12.35 [cd / m ² ], the panel reflectance is 31.9%, and the color temperature is 6980K.

In addition, when the content of cobalt (Co) is 0.05 parts by weight, the darkroom contrast is 10700: 1, the clear room contrast is 54: 1, the reflected light is 11.2 [cd / m ² ], the panel reflectance is 29.8%, and the color temperature. Is 7070K.

As described above, when the content of the cobalt (Co) material is 0.05 parts by weight or less, the content of the cobalt material is insignificant, so that the contrast property is lowered, the reflected light and the reflectance have a relatively large value, and the color temperature is low. have.

On the other hand, when the content of cobalt (Co) is 0.1 parts by weight, the darkroom contrast is 11450: 1, the clearroom contrast is 60: 1, the reflected light is 9.31 [cd / m ² ], the panel reflectance is 26.2%, The color temperature is 7452K. That is, when the cobalt (Co) content is 0.1 parts by weight, the contrast characteristics are improved compared to the case of 0.05 parts by weight or less, the value of the reflected light and the reflectance decreases, and the color temperature increases.

As such, the upper dielectric layer has a blue color due to the physical properties of the cobalt (Co) material, and thus the upper dielectric layer absorbs the light incident from the outside, thereby improving the contrast characteristic and reducing the reflected light and the reflectance. You can do it.

In addition, since the upper dielectric layer has a blue-based color, blue light may be further emphasized as visible light emitted from the inside of the panel passes through the upper dielectric layer, thereby improving color temperature characteristics.

In addition, when the content of cobalt (Co) material is 0.15 parts by weight or more and 0.3 parts by weight or less, the darkroom contrast is further improved as 12500: 1 to 13900: 1, and the clear room contrast is further improved to 65: 1 to 79: 1, The reflected light is further reduced from 8.54 [cd / m ² ] to 7.05 [cd / m ² ], the panel reflectance is further reduced from 23.3% to 20.7%, and the color temperature is further increased from 7516K to 7732K. That is, when the cobalt (Co) content is 0.15 parts by weight or more and 0.3 parts by weight or less, the contrast characteristics, the reflected light, the reflectance, and the color temperature characteristics are all improved.

When the cobalt (Co) content is 0.5 parts by weight or more, the darkroom contrast is 14200: 1 or more, the clear room contrast is 84: 1 or more, the reflected light is 6.42 [cd / m ² ] or less, and the panel reflectance is 19.4. Less than%, color temperature is over 7827K.

Next, referring to FIG. 17B, the luminance of an image implemented when cobalt (Co) is not included as the first blue pigment in the upper dielectric layer is about 180 [cd / m ² ].

When the content of the cobalt (Co) material is 0.05 parts by weight, the luminance of the implemented image is approximately 179 [cd / m ² ]. As such, when the cobalt (Co) material is included, the brightness of the image is reduced because of the cobalt (Co) material, and the upper dielectric layer has a blue color, and thus the transmittance of the upper dielectric layer is reduced. Because it becomes.

When the content of cobalt (Co) material is 0.1 parts by weight, the luminance of the implemented image is approximately 177 [cd / m ² ]. In addition, when the content of the cobalt (Co) material is 0.15 parts by weight or more and 0.3 parts by weight or less, the luminance of the implemented image is about 174 [cd / m ² ] or more and 176 [cd / m ² ] or less.

When the content of cobalt (Co) material is 0.4 parts by weight or more and 0.6 parts by weight or less, the luminance of the image is about 165 [cd / m ² ] or more and 170 [cd / m ² ] or less.

On the other hand, when the content of the cobalt (Co) material is 0.7 parts by weight or more, the content of the cobalt (Co) material may be excessive, so that the transmittance of the upper dielectric layer is excessively low, so that the luminance of the image realized is approximately 149 [ cd / m ² ] is drastically reduced.

In consideration of the contents of FIGS. 17A to 17B, in order to prevent excessively decreasing the transmittance of the upper dielectric layer while improving the reflectance, the reflected light characteristic, the contrast characteristic, and the color temperature characteristic, the luminance of the image to be implemented is excessively reduced. The upper dielectric layer may preferably include 0.1 parts by weight or more and 0.6 parts by weight or less of cobalt (Co) material as the first blue pigment, and more preferably 0.15 parts by weight or more and 0.3 parts by weight or less.

18A to 18B are views for explaining the thickness of the upper dielectric layer.

18A to 18B, the thickness T of the upper dielectric layer is measured in each case of 25 μm, 28 μm, 30 μm, 33 μm, 35 μm, 36 μm, 38 μm, 39 μm, 43 μm, 45 μm. Data is shown for the reflected reflectance and luminance. Here, the upper dielectric layer includes cobalt (Co) as a pigment, the content of the cobalt (Co) material is the same as 0.2 parts by weight, and the first phosphor layer contains 0.2 parts by weight of red pigment.

First, referring to FIG. 18A, when the thickness of the upper dielectric layer is 25 μm, the panel reflectance is relatively high as 28.2% because the thickness of the upper dielectric layer is excessively thin so that it is difficult to sufficiently absorb light incident from the outside.

Further, even when the thickness of the upper dielectric layer is 28 µm or more and 30 µm or less, the panel reflectance is relatively high as 27.4% or more and 27.8% or less.

On the other hand, when the thickness of the upper dielectric layer is 33 mu m, the panel reflectance decreases to 26.2%.

In addition, when the thickness of the upper dielectric layer is 35 mu m or more, the panel reflectance is 24.3% or less because the thickness of the upper dielectric layer is sufficiently thick.

Next, referring to FIG. 18B, in terms of luminance, the luminance of an image implemented when the thickness of the upper dielectric layer is 25 μm is approximately 180 [cd / m ² ].

In addition, when the thickness of the upper dielectric layer is 28 µm or more and 30 µm or less, the luminance of the image is approximately 175 [cd / m ² ] or more and 178 [cd / m ² ] or less.

Further, when the thickness of the upper dielectric layer is 33 mu m, the luminance of the image is approximately 174 [cd / m ² ].

In addition, when the thickness of the upper dielectric layer is 35 µm or more and 39 µm or less, the luminance of the image is approximately 168 [cd / m ² ] or more and 173 [cd / m ² ] or less.

On the other hand, when the thickness of the upper dielectric layer is 43 µm or more, the brightness of the image is drastically reduced to about 154 [cd / m ² ] or less.

In view of the contents of FIGS. 18A to 18B, the thickness of the upper dielectric layer is 33 μm or more in order to prevent excessively decreasing the transmittance of the upper dielectric layer while reducing the reflectance and thus reducing the luminance of the image. It may be preferably 39 μm or less, and more preferably 35 μm or more and 38 μm or less.

Meanwhile, the pigment included in the upper dielectric layer further includes at least one of nickel (Ni), chromium (Cr), copper (Cu), cerium (Ce), and manganese (Mn) in addition to the cobalt (Co) material. It is possible.

The nickel (Ni) material may cause the upper dielectric layer to have dark blue when included as a pigment in the upper dielectric. Therefore, the dark blue color may be further emphasized among colors of the image to be implemented. When the content of the nickel (Ni) material is excessively high, the transmittance of the upper dielectric layer may be excessively low. Therefore, the content of nickel (Ni) may be preferably 0.1 parts by weight or more and 0.2 parts by weight or less.

When the chromium (Cr) material is included as a pigment in the upper dielectric layer, the color of the upper dielectric layer may further add red. Therefore, blue color is emphasized and red color is emphasized in the color of the image to be implemented, so that the color implementation range can be increased. The content of such chromium (Cr) material may be preferably 0.1 parts by weight or more and 0.3 parts by weight or less.

If the copper (Cu) material is included as a pigment in the upper dielectric layer, the color of the upper dielectric layer may further add green. Therefore, blue color is emphasized and green color is emphasized among the colors of the image to be implemented, so that the color implementation range can be increased. The content of copper (Cu) may be preferably 0.03 parts by weight or more and 0.09 parts by weight or less.

The cerium (Ce) material may further add yellow to the color of the upper dielectric layer when it is included as a pigment in the upper dielectric layer. Accordingly, blue color is emphasized and yellow color is also emphasized in the color of the image to be implemented, so that the color range can be increased. The content of the cerium (Ce) material may be preferably 0.1 parts by weight or more and 0.3 parts by weight or less.

The manganese (Mn) material can cause the blue of the upper dielectric layer to become more intense when included as a pigment in the upper dielectric layer. Therefore, it is possible to further improve the color temperature of the image to be implemented. The content of such manganese (Mn) material may be preferably 0.2 parts by weight or more and 0.6 parts by weight or less.

On the other hand, when cobalt (Co) material is included in the upper dielectric layer as a pigment, the transmittance of the upper dielectric layer may be lowered, thereby lowering the brightness of the image implemented. In order to prevent such decrease in brightness, it may be desirable to form the upper dielectric layer by using a glass material that does not contain lead (Pb), so that the lead (Pb) content of the upper dielectric layer is 1000 parts per million (ppm) or less. have. This will be described with reference to FIG. 19.

19 is a diagram for comparing a lead-free dielectric layer with a flexible dielectric layer.

FIG. 19 shows luminance and efficiency data when the top dielectric layer is lead free and when the top dielectric layer is flexible.

When measuring the luminance, the luminance of the full-white (F / W) that turns all the discharge cells on, and the 25% window pattern image on the screen In each case, the luminance is measured.

When measuring the efficiency, the efficiency in the case of full-white and the efficiency in the 25% window pattern are respectively measured.

In addition, the flexible upper dielectric layer is formed by using a PbO-B ₂ O ₃ -SiO ₂ -based glass material so that the lead (Pb) component of the upper dielectric layer exceeds 1000 ppm, and the lead-free upper dielectric layer Is a case where the lead (Pb) content of the upper dielectric layer is 1000 ppm or less.

The unit of luminance is [cd / m ² ], and the unit of efficiency is [lm / W].

Referring to FIG. 19, in the case of the flexible upper dielectric, when a driving voltage of 192 V is applied between the scan electrode and the sustain electrode, the luminance of light generated in full-white is approximately 129 [cd / m ² ], and the efficiency is 0.99 [ lm / W], the luminance of light generated in the 25% window pattern is approximately 328 [cd / m ² ], and the efficiency is 0.65 [lm / W].

On the other hand, in the case of a lead-free upper dielectric, when a driving voltage of 192 V is applied between the scan electrode and the sustain electrode, the luminance of light generated in full-white is approximately 141 [cd / m ² ], and the efficiency is 1.03 [lm / W], the luminance of light generated in the 25% window pattern is approximately 362 [cd / m ² ], and the efficiency is 0.73 [lm / W].

Comparing the case of the lead-free upper dielectric layer with the case of the lead-free upper dielectric layer described above, it can be seen that the brightness and the efficiency of the lead-free upper dielectric layer are more improved than the flexible upper dielectric layer. This results in less lead (Pb) content of the lead-free top dielectric layer compared to the flexible top dielectric layer, resulting in a smaller capacitance of the lead-free top dielectric layer compared to the capacitance of the flexible top dielectric layer, thereby discharging. This is because the current decreases.

As described above, when the lead (Pb) content of the upper dielectric layer is 1000 ppm or less, even if the upper dielectric layer includes cobalt (Co) material as a pigment, luminance of the upper dielectric layer may be compensated for as it decreases.

In addition, lead (Pb) is a toxic substance that can have a serious adverse effect on the human body when accumulated in the human body. Therefore, when the lead (Pb) component of the plasma display panel according to the embodiment of the present invention is 1000 ppm or less, adverse effects on the human body may be reduced.

20 is a diagram for explaining an example of another structure of the upper dielectric layer. In FIG. 20, the description of the details described above will be omitted.

Referring to FIG. 20, the upper dielectric layer 104 may include a convex portion 700 that is thicker than the surroundings and a concave portion 710 that is thinner than the surroundings.

Here, the recess 710 may be disposed between the scan electrode 102 and the sustain electrode 103.

In addition, the maximum thickness of the upper dielectric layer 104, that is, the thickness of the upper dielectric layer 104 in the convex portion 700 is t2, and the thickness of the upper dielectric layer 104 in the recess 710 is t1 and , The depth of the recess 710 is h, the width of the recess 710 is W.

When a drive signal is supplied to the scan electrode 102 and the sustain electrode 103 to generate a discharge, most of the wall charges are provided in the recess 710 disposed between the scan electrode 102 and the sustain electrode 103. Since the wall charges may accumulate, the path of discharge may be relatively shorter than when the upper dielectric layer 104 has a flat structure. Accordingly, the discharge start voltage between the scan electrode 102 and the sustain electrode 103 is lowered, so that driving efficiency can be improved.

In addition, when the upper dielectric layer 104 includes a cobalt (Co) material as the first blue pigment, the upper dielectric layer 104 has a blue-based color. Therefore, the transmittance is lowered compared to the case in which the upper dielectric layer 104 does not include a cobalt (Co) material and has a transparent color.

On the other hand, as shown in FIG. 20, when the upper dielectric layer 104 includes the convex portion 700 and the concave portion 710, the discharge start voltage between the scan electrode 102 and the sustain electrode 103 may be lowered. As a result, the decrease in luminance due to the cobalt (Co) material may be compensated.

21 is a diagram for explaining another example of the structure of the upper dielectric layer. In FIG. 21, the description of the details described above will be omitted.

Referring to FIG. 21, the upper dielectric layer 104 may have a two-layer structure. For example, the top dielectric layer 104 may include a first top dielectric layer 900 and a second top dielectric layer 910 stacked in turn.

Pigment may be included in at least one of the first upper dielectric layer 900 or the second upper dielectric layer 910.

On the other hand, when the metallic pigment is included in the upper dielectric layer 104, the dielectric constant of the upper dielectric layer may be lowered.

In addition, since the scan electrode 102 and the sustain electrode 103 are buried, and the scan electrode 102 and the sustain electrode 103 are insulated from each other, the first upper dielectric layer 900 may be advantageous. . Therefore, it is preferable that the first blue pigment is not included in the first upper dielectric layer 900, and the first blue pigment is included in the second upper dielectric 910 disposed on the first upper dielectric layer 900. Can be.

22A to 22C illustrate another example of a plasma display panel according to an exemplary embodiment of the present invention. In FIGS. 22A to 2C, descriptions of the details described above will be omitted.

First, referring to FIG. 22A, a black matrix 1000 that overlaps the partition 112 may be further disposed on the front substrate 101. The black matrix 1000 absorbs incident light, thereby suppressing the partition wall 112 from reflecting light. Then, the panel reflectance can be reduced to improve the contrast characteristic.

In FIG. 22A, only the case where the black matrix 1000 is disposed on the front substrate 101 is illustrated. However, although not illustrated, the black matrix 1000 may be disposed on the upper dielectric layer (not shown).

In addition, the black layers 120 and 130 may be further disposed between the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b. Then, by preventing light reflection by the bus electrodes 102b and 103b on the black layers 120 and 130, the panel reflectance can be further lowered.

Next, referring to FIG. 22B, a common black matrix 1010 may be disposed between the two sustain electrodes 103 to contact the two sustain electrodes 103, respectively. The common black matrix 1010 may be formed of substantially the same material as the black layers 120 and 130. In this case, when the black layers 120 and 130 are manufactured, the common black matrix 1010 may be formed together, thereby reducing the time required for the manufacturing process.

Next, referring to FIG. 22C, the top black matrix 1020 may be disposed on the partition wall 112. As such, when the top black matrix 1020 is directly formed on the partition wall 112, the panel reflectance may be reduced without forming the black matrix on the front substrate 101.

As described in detail above, when the upper dielectric layer 104 includes the first blue pigment and the first phosphor layer includes the red pigment, the panel reflectance may be reduced.

Accordingly, the black layers 120 and 130, the black matrix 1000, the common black matrix 1010, and the top black matrix 1020 described in FIGS. 22A to 22C may be omitted. The reason is that when the first blue pigment such as cobalt (Co) material is mixed in the upper dielectric layer 104 and the red pigment is included in the first phosphor layer, the panel reflectance can be sufficiently lowered. 130, the black matrix 1000, the common black matrix 1010, and the top black matrix 1020 may be prevented from rapidly increasing the panel reflectance.

As such, when the black layers 120 and 130, the black matrix 1000, the common black matrix 1010, and the top black matrix 1020 are omitted, the manufacturing process may be simplified and the manufacturing cost may be further reduced. .

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.

Plasma display panel according to an embodiment of the present invention by forming the scan electrode and the sustain electrode in a single layer structure to reduce the manufacturing cost, the first phosphor layer to include a YVPO ₄ : Eu material, thereby reducing color reproduction This improves the image quality of the image.

Claims (9)

Front substrate; A scan electrode and a sustain electrode that are parallel to each other when disposed on the front substrate; A rear substrate disposed opposite the front substrate; Barrier ribs defining a discharge cell between the front substrate and the rear substrate; And A phosphor layer formed on the discharge cell; Including, The scan electrode and the sustain electrode are one layer, The phosphor layer includes a first phosphor layer that emits red light, a second phosphor layer that emits blue light, and a third phosphor layer that emits green light, And the first phosphor layer comprises YVPO ₄ : Eu material. The method of claim 1, The scan electrode and the sustain electrode are respectively A plurality of line portions intersecting the address electrodes; At least one connecting portion connecting at least two line portions of the plurality of line portions; And At least one protrusion protruding from the plurality of line portions; Plasma display panel comprising a. The method of claim 1, And the first phosphor layer comprises iron (Fe) as a red pigment. The method of claim 1, The second phosphor layer includes a second phosphor material and a cobalt (Co) material as a blue pigment. Front substrate; A scan electrode and a sustain electrode that are parallel to each other when disposed on the front substrate; An upper dielectric layer disposed over the scan electrode and the sustain electrode; A rear substrate disposed opposite the front substrate; Barrier ribs defining a discharge cell between the front substrate and the rear substrate; And A phosphor layer formed on the discharge cell; Including, The scan electrode and the sustain electrode are one layer, The phosphor layer includes a first phosphor layer that emits red light, a second phosphor layer that emits blue light, and a third phosphor layer that emits green light, The first phosphor layer comprises a YVPO ₄ : Eu material, The upper dielectric layer includes a glass material and a cobalt (Co) material as a pigment. The method of claim 5, wherein The content of the cobalt (Co) material is a plasma display panel of 0.1 parts by weight or more and 0.6 parts by weight or less. The method of claim 5, wherein The content of the cobalt material is 0.15 parts by weight or more and 0.3 parts by weight or less. The method of claim 5, wherein The lead (Pb) content of the upper dielectric layer is less than 1000 ppm (Parts Per Million). The method of claim 5, wherein And a thickness of the upper dielectric layer is 33 μm or more and 39 μm or less.

Images