KR100589402B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel, comprising: a first substrate and a second substrate disposed to face each other; Address electrodes formed on the second substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells and a non-discharge area; A phosphor layer formed in each of the discharge cells; A gas absorbing layer formed in each of the non-discharge regions; And discharge sustain electrodes formed on the first substrate.

In the plasma display panel of the present invention, a gas absorption layer including a Ba-based compound is formed in the non-discharge region, thereby preventing degradation of the phosphor due to impurity gas, thereby improving lifetime characteristics.

Non-discharge area, impurity gas, gas intake, PDP

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

2 is a partial plan view of a plasma display panel according to a first embodiment of the present invention;

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a partial plan view showing a plasma display panel according to a second embodiment of the present invention;

5 is a partial delivery perspective view showing a conventional plasma display panel.

6 is a plan view schematically showing the position and shape of the getter is installed in the plasma display panel.

[Industrial use]

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving the lifetime of blue and green phosphors.

[Prior art]

In general, a plasma display panel (hereinafter referred to as a "PDP") is a display device that generates a predetermined image by exciting phosphors by ultraviolet rays generated by gas discharge. Is in the spotlight.

A conventional general PDP structure is shown in FIG. 5. Referring to FIG. 5, in the conventional general PDP structure, an address electrode 101 is formed along one direction (the x-axis direction of the drawing) on the back substrate 100 and covers the address electrode 101 while covering the back substrate 100. The dielectric layer 103 is formed on the front surface. A stripe pattern partition wall 105 is formed on the dielectric layer 103 so as to be disposed between each address electrode 101, and red, green, and blue colors are formed between the partition walls 105. The phosphor layer 107 is formed.

In addition, one surface of the front substrate 110 facing the rear substrate 100 may be provided with a pair of transparent electrodes 112 and bus electrodes 113 along a direction crossing the address electrode 101 (y-axis direction of the drawing). The discharge sustain electrode 114 is formed, and the dielectric layer 116 and the MgO passivation layer 118 are formed on the entire front substrate 110 while covering the discharge sustain electrode 114.

The point where the address electrode 101 on the rear substrate 100 and the discharge sustain electrode 114 on the front substrate 110 cross each other constitutes a discharge cell.

An address voltage Va is applied between the address electrode 101 and the discharge sustain electrode 114 to perform address discharge, and a sustain voltage Vs is applied between the pair of discharge sustain electrodes 114 to sustain sustain discharge. . The vacuum ultraviolet rays generated at this time excite the phosphor to emit visible light through the transparent front substrate 110 to implement the screen of the PDP.

However, in the PDP structure having the discharge sustaining electrode 114 and the stripe-shaped barrier rib 105 having a shape as shown in FIG. 5, crosstalk occurs even between neighboring discharge cells with the barrier rib 105 therebetween. In addition, since the discharge spaces are connected to each other along the direction in which the barrier ribs 105 are formed, there is a possibility that erroneous discharge occurs between neighboring discharge cells. In order to prevent this, the distance between the discharge sustain electrodes 114 corresponding to adjacent pixels must be secured to a predetermined level or more, which hinders the improvement of efficiency.

In addition, when one pixel or an area in the display area is discharged for a long time and terminated, it may be found that the brightness is different from that of the pixels around the display area. This is because the MgO protective film 98 and the phosphor layer 87 are contaminated by residual gas and exhaust gas in the panel after discharge. Such contamination adversely affects the lifetime characteristics of panels in the long run. Therefore, a getter is employed to remove the impurity gas which is present in the panel and causes such contamination.

6 is a plan view schematically illustrating a position and a shape in which a getter is installed in a conventional plasma display panel.

Referring to FIG. 6, in the conventional PDP, getters 204, 206, and 208 are provided to be adjacent to the edge of the effective screen unit 202. These getters 204, 206, and 208 are installed to have a shape such as a pill type 204, a strip type 206, or a paste type 208, and the PDP. It removes the impurity gas generated in the effective screen portion 202 and discharged to the edge along the passage formed by the partition wall. A related art is the getter system for plasma displays disclosed in US Pat. No. 6,472,819.

However, in the PDP having such a getter structure, the impurity gas is generated in the effective display unit 202, and the getters 204, 206, and 208 are adjacent to the edge of the effective display unit 202, so that discharge of discharge gas is prevented. If it is not smooth, there is a problem that the efficiency of the getter fails to perform properly.

In addition, since impurity gas generated in the phosphor layer or the partition wall reaches other getters 204, 206, and 208 through other discharge cells, the impurity gas may still contaminate another discharge space in the moving layer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to optimize the structure of the partition partitioning the electrode and the discharge cell, which contributes to the discharge, to maximize the discharge efficiency and to the visible light of the vacuum ultraviolet rays generated during discharge It is to provide a plasma display panel that can increase the conversion efficiency and ensure the discharge stability.

Another object of the present invention is to provide a plasma display panel that can effectively remove impurities generated in the panel effective screen portion.

In order to achieve the above object, the present invention is a first substrate and a second substrate disposed opposite each other; Address electrodes formed on the second substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells and a non-discharge area; A phosphor layer formed in each of the discharge cells; A gas absorbing layer formed in each of the non-discharge regions; And a discharge sustain electrode formed on the first substrate. In this case, the non-discharge area is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell. In other words, the non-discharge area may be disposed on a line passing between the horizontal axis and the vertical axis passing through the center of each discharge cell, and the lines passing between the horizontal axis and the vertical axis passing through the center of each discharge cell cross each other. It is preferred to be disposed in the part.

The non-discharge regions may be formed to have independent cell structures by the partition walls, and the non-discharge regions may be divided into a plurality of cells. The pair of discharge cells adjacent to the discharge sustaining electrode are configured to share at least one partition wall.

Hereinafter, the present invention will be described in more detail.

The plasma display panel of the present invention comprises: a first substrate and a second substrate (hereinafter referred to as "front substrate and back substrate") disposed to face each other at predetermined intervals; Address electrodes formed on the second substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells and a non-discharge area; Phosphor layers formed in the respective discharge cells; A gas absorbing layer formed in the non-discharge region; And a discharge sustain electrode formed on the first substrate.

In this case, the non-discharge area is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell. In other words, the non-discharge area may be disposed on a line passing between the horizontal axis and the vertical axis passing through the center of each discharge cell, and the lines passing between the horizontal axis and the vertical axis passing through the center of each discharge cell cross each other. It is preferable that it is a non-discharge area arrange | positioned at a part.

The non-discharge regions may be formed to have independent cell structures, that is, closed cell structures, by the partition walls, and the non-discharge regions may be divided into a plurality of cells. The pair of discharge cells adjacent to the discharge sustaining electrode are configured to share at least one partition wall.

The gas absorbing layer formed in the non-discharge region absorbs impurity gas generated in each of the display regions during plasma discharge, that is, serves as a getter. The gas absorbing layer is formed of a Ba-based compound. Such Ba-based compounds include (Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn (where a is an integer of 1 to 23) or BaMgAl _x O _y : Eu (where x is an integer of 10 to 14) And y is an integer of 17 to 23).

The non-discharge regions may be formed to have independent cell structures, that is, closed cell structures, by the partition walls, and the non-discharge regions may be divided into a plurality of cells. The pair of discharge cells adjacent to the discharge sustaining electrode are configured to share at least one partition wall.

In the present invention, each of the discharge cells may be made narrower as the widths of both ends in the direction of the address electrode move away from the center of the discharge cells, and the widths of both ends may be the same.

The depth measured from the upper end of the partition wall at both end portions of the discharge cell in the direction of the address electrode may become shallower as the distance from the center of the discharge cell increases.

When the widths of both ends of the discharge cells become narrower as they move away from the center of the discharge cells, the shapes of both ends located in the address electrode direction may have any one of a trapezoidal shape, a wedge shape, or an arc shape. The partition walls shared by a pair of neighboring discharge cells in the discharge sustaining electrode direction are formed in parallel to each other.

The non-discharge region is disposed in a region surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell, respectively, and the partition wall forming the discharge cell is formed of a first partition member parallel to the address electrode and a non-parallel parallel to the address electrode. It consists of two partition members. The second partition member may be formed to cross the address electrode direction.

Since the height of the first partition member and the second partition member is different from each other, the height of the first partition member may be formed higher or lower than the height of the second partition member.

The non-discharge area is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell, and each discharge cell has a width at both ends in the direction of the address electrode as the width of the discharge cell increases away from the center of the discharge cell. The discharge sustaining electrodes are formed to be narrowed, and the discharge sustaining electrodes are arranged in pairs to correspond to the respective discharge cells, and the pair of discharge sustaining electrodes extend toward the respective discharge cells and face each other. Include.

The opposite protruding electrode becomes narrower as the rear end portions of the discharge cells corresponding to both ends thereof move away from the center of the discharge cells, and both sides of the rear end portions corresponding to both end portions of the discharge cells are formed in the discharge cells. It may be formed parallel to the inner wall.

Each of the protruding electrodes arranged on at least one side of the pair of discharge sustaining electrodes may have a concave portion formed at an opposite end, and the concave portion may be formed at a central portion of the opposite end of the protruding electrode. The convex portions may be further formed on both sides of the concave portion of the protruding electrode, and the concave portion and the convex portion of the protruding electrode may be smoothly curved at an edge thereof.

The protruding electrode may be made of a transparent electrode.

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

1 is a partially exploded perspective view showing a plasma display panel according to a first embodiment of the present invention, Figure 2 is a partial plan view showing a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 1, a plasma display panel (hereinafter referred to as a “PDP”) according to a first embodiment of the present invention basically faces the first substrate 10 and the second substrate 20 at a predetermined interval. The plurality of discharge cells 27R, 27G, and 27B are partitioned by partition walls in a space between the two substrates 10 and 20 so as to cause plasma discharge. The first substrate 10 and the second substrate ( 20, the address electrodes 21 and the discharge sustain electrodes 12, 13 are arranged.

Specifically, first, a plurality of address electrodes 21 are formed along one direction (x-axis direction in the drawing) of the second substrate 20 on the opposite surface of the second substrate 20 from the first substrate 10. do. The address electrodes 21 are formed in a stripe shape so as to be parallel to each other while maintaining a predetermined distance from the neighboring address electrodes 21. A dielectric layer 23 is also formed on the second substrate 20 on which the address electrode 21 is formed. The dielectric layer 23 is formed on the entire surface of the substrate while covering the address electrode 21. In the present embodiment, the stripe address electrode 21 is taken as an example, but the scope of the present invention is not limited thereto, and the shape of the address electrode to be applied may be variously changed.

A partition wall 25 is disposed in the space between the first substrate 10 and the second substrate 20 to partition the plurality of discharge cells 27R, 27G, 27B and the non-discharge region 26. The partition wall 25 is preferably formed on the upper surface of the dielectric 23 formed on the second substrate 20. Here, the discharge cells 27R, 27G, and 27B contain a discharge gas therein, and the discharge cells 27R, 27G, and 27B are spaces intended to cause gas discharge therein while an address voltage or a discharge sustain voltage is applied, and the non-discharge area 26 has a separate voltage therein. Is not applied, and is thus an area or space where discharge or light emission is not intended.

The non-discharge region 26 partitioned by the partition wall 25 is formed by virtual abscissas H and ordinates V passing through the centers of the discharge cells 27R, 27G, and 27B. It is placed in the enclosed area. In particular, on the line passing between the horizontal axis (H) and the vertical axis (V) passing through the center of each of the discharge cells (27R, 27G, 27B), respectively, it is preferable that the lines are arranged in the intersection. In other words, a common non-discharge region 26 is formed between two pairs of discharge cells horizontally and vertically adjacent to each other. The non-discharge regions 26 are formed to have independent cell structures by the partition walls 25.

The gas absorbing layer 32 is formed in the non-discharge region 26. The gas absorbing layer 32 may be formed by applying a printing method using a Ba-based compound. The Ba-based compound can easily capture impurity gas, for example H ₂ O, and impurity gas present in the panel interior space is dispersed and infiltrated into the gas absorbing layer formed in the non-discharge region, and the impurity gas invades the phosphor layer. Can be reduced relatively. Therefore, the deterioration of the phosphor due to the impurity gas can be prevented. In particular, the effect is that the green and blue phosphors among the red, green, and blue phosphors used in the phosphor layer easily penetrate the impurity gas, so that the deterioration of the phosphor is caused by the impurity gas. It may appear larger when forming the absorber layer. In general, green phosphors may be Zn ₂ SiO ₄ : Mn alone or Zn ₂ SiO ₄ : Mn and YBO ₃ : Tb, Zn ₂ SiO ₄ : Mn and YBO ₃ : Tb, (Ba, Sr, Mg) O AAl ₂ O ₃ : Mn (where a is an integer of 1 to 23) is used by mixing two or three kinds, and as a blue phosphor, BaMgAl _x O _y : Eu (x is an integer of 10 to 14, y Is an integer of 17 to 23). That is, since the fluorescent material used as a gas absorbing layer can be used as it is, there is no economic problem by adding a new material, and there is no fear of adversely affecting the PDP properties.

On the other hand, the discharge cells 27R, 27G, and 27B are formed so as to share at least one partition wall with those neighboring in the direction of the discharge sustain electrodes 12 and 13, and in the direction of the address electrode 21 (x-axis in the figure). Direction, the width of both ends (discharge sustaining electrode direction, i.e., y-axis direction in the figure) becomes narrower as it moves away from the center of each discharge cell 27R, 27G, 27B. That is, referring to FIG. 1, the width Wc at the center of the discharge cells 27R, 27G, 27B is larger than the width We at the ends of the discharge cells 27R, 27G, 27B. The width We at the end portion is gradually narrowed away from the center of the discharge cells 27R, 27G, 27B. In this embodiment, both ends of the discharge cells 27R, 27G, and 27B located in the direction of the address electrode 21 have a trapezoidal shape, and thus the overall planar shape of each discharge cell 27R, 27G, 27B is octagonal. Is achieved.

The partition walls 25 partitioning the discharge cells 27R, 27G, 27B and the non-discharge region 26 are not parallel to the first partition member 25a and the address electrode 21 parallel to the address electrode 21. The second partition member 25b may be divided into two parts. The second partition member 25b is formed to intersect the address electrode 21. In particular, the second partition member 25b has an approximately X-shape between the discharge cells 27R, 27G, and 27B adjacent in the address electrode 21 direction.

Phosphors of red (R), green (G), and blue (B) colors are applied to discharge cells 27R, 27G, and 27B, respectively, to form phosphor layers 29R, 29G, and 29B.

3 is a cross-sectional view taken along a line A-A of FIG. 2.

Referring to FIG. 3, in the discharge cell 27R of the PDP according to the present embodiment, a depth measured from an upper end of the partition wall 25 at both ends positioned in the direction of the address electrode 21 is measured in the discharge cell 27R. The further away from the center, the shallower it is formed. That is, the depth de at the end of the discharge cell 27R is shallower than the depth dc at the center, and the farther the depth de at this end is from the center of the discharge cell 27R. It gradually becomes shallow.

The phosphor layer formed in the discharge cell 27R at the end of the discharge cell 27R having a relatively weak intensity of gas discharge by forming the depth of the discharge cell 27R differently at the center and at both ends as described above. The distance between the 29R and the discharge sustain electrodes 12 and 13 can be narrowed, and consequently, the phosphor layer can be disposed at a closer distance from the discharge sustain electrode to convert the vacuum ultraviolet rays into visible light generated during discharge. The efficiency can be improved. The same applies to the discharge cells 27G and 27B of different colors.

On the other hand, on the opposite surface of the first substrate 10 to the second substrate 20, a plurality of discharges are maintained along the direction (y-axis direction in the drawing) intersecting with the address electrode 21 on the second substrate 20. Electrodes 12 and 13 are formed. In addition, the dielectric layer 14 is formed on the entire surface of the first substrate 10 while covering the discharge sustain electrodes 12 and 13, and the MgO protective film 16 is formed thereon. 1 and 2, the dielectric layer 14 and the MgO protective layer 16 are omitted for simplicity of the drawings.

The discharge sustain electrode 12 is formed in a stripe shape, and the bus electrodes 12b and 13b corresponding to each of the discharge cells 27R, 27G, and 27B are paired with each of the discharge cells 27R from the bus electrodes 12b and 13b. , Protruding electrodes 12a and 13a which extend into the interior of the 27G and 27B so as to face each other. The protruding electrodes 12a and 13a are formed such that their rear ends corresponding to both ends of the discharge cells 27R, 27G and 27B become narrower as they move away from each center of the discharge cells 27R, 27G and 27B. do. The protruding electrodes 12a and 13a may be formed so that both sides of the rear end portions corresponding to both end portions of the discharge cells 27R, 27G and 27B are parallel to the inner walls of the discharge cells 27R, 27G and 27B. In particular, in the present embodiment, the rear ends of the protruding electrodes 12a and 13a have a trapezoidal shape that narrows gradually to match the shape of the ends of the discharge cells 27R, 27G and 27B.

The protruding electrodes 12a and 13a may be formed of transparent electrodes, and indium tin oxide (ITO) electrodes may be applied. It is preferable to use a metal electrode as the bus electrodes 12b and 13b.

4 is a partial plan view showing a PDP according to a second embodiment of the present invention. As shown, the PDP according to the second embodiment of the present invention is a discharge cell formed by the partition wall 125, that is, the discharge region 127 is formed in a closed type, the non-discharge region between the discharge region 127 That is, the passage 129 is formed so as to be arranged in the horizontal direction on the basis of the drawing. This passage is here formed for the purpose of preventing exhaust and cross-talk.

In such a PDP, the gas absorbing layer 131 according to the present invention may be formed as the non-discharge region 129.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only one preferred embodiment of the present invention and the present invention is not limited to the following examples.

(Example 1)

Ethyl cellulose resin, an organic binder, was dissolved in a mixed organic solvent of butyl carbitol acetate and terpineol, Mg (NO ₃ ) ₂ .6H ₂ O was dissolved, and then BaMgAl ₁₀ O ₁₇ : Eu blue phosphor was added and stirred. . Subsequently, the mixture was kneaded with a 3-roll mill while adjusting the viscosity of the obtained mixture to prepare a blue phosphor paste for a plasma display panel.

The blue phosphor paste was applied to the discharge space between the address electrode and the partition wall of the second substrate on which the partition wall was formed to form a blue phosphor layer.

In addition, the blue phosphor paste was applied to all non-discharge regions to form a gas absorbing layer.

The blue y color coordinate of the plasma display panel obtained in Example 1 was measured, and the results are shown in Table 1 below. The blue y color coordinate is an index indicating the amount of H ₂ O adsorption that is an impure gas. The blue phosphor paste was not applied to the non-discharge region as Comparative Example 1, and is also shown in Table 1 below.

Comparative Example 1 Example 1 Blue y color coordinate (H ₂ O adsorption index) 0.103 0.087

As shown in Table 1, the blue y color coordinate of Example 1, in which the blue phosphor was applied to the non-discharge region, was lower than that of Comparative Example 1, and the result was that impurity gas (H ₂ O) present in the interior space of the panel was dispersed. Indicates.

(Example 2)

Ethyl cellulose resin, which is an organic binder, was dissolved in a mixed organic solvent of butyl carbitol acetate and terpineol, and Mg (NO ₃ ) ₂ .6H ₂ O was dissolved, followed by Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb and ( A green phosphor mixed with Ba, Sr, Mg) O.aAl ₂ O ₃ : Mn in a weight ratio of 30 wt%: 35 wt%: 35 wt% was added and stirred. Subsequently, the mixture was kneaded with a 3-roll mill while adjusting the viscosity of the obtained mixture to prepare a green phosphor paste for a plasma display panel.

The green phosphor paste was applied to the discharge space and the non-discharge space between the partition wall of the second substrate on which the address electrode and the partition wall were formed to form a green phosphor layer and a gas absorbing layer, respectively.

The blue y color coordinate of the plasma display panel manufactured according to Example 2 was measured, and the results are shown in Table 2 below. In addition, a mixture of Zn ₂ SiO ₄ : Mn and YBO ₃ : Tb in a weight ratio of 50% by weight to 50% by weight as a green phosphor was used as Comparative Example 2, and is shown together in Table 2 below.

Comparative Example 2 Example 2 Blue y color coordinate (H ₂ O adsorption amount index) 0.113 0.105

As shown in Table 2, since the blue y color coordinate of Example 2 is smaller than that of Comparative Example 2, it can be seen that the impurity gas and H ₂ O were well dispersed.

As described above, the plasma display panel of the present invention may form a gas absorption layer including a Ba-based compound in the non-discharge region, thereby preventing degradation of the phosphor due to impurity gas, thereby improving life characteristics.

Claims (9)

A front substrate and a rear substrate disposed to face each other; Address electrodes formed on the rear substrate; Barrier ribs disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells and a non-discharge region; Phosphor layers formed in the respective discharge cells; A gas absorbing layer formed in each of the non-discharge regions; And Discharge sustain electrodes formed on the front substrate; Plasma display panel comprising a. The plasma display panel of claim 1, wherein the gas absorbing layer comprises a Ba-based compound. The method of claim 2, wherein the Ba-based compound is (Ba, Sr, Mg) O.aAl ₂ O ₃ (a is an integer of 1 to 23) or BaMgAl _x O _y : Eu (x is an integer of 10 to 14, y is an integer of 17 to 23). The plasma display panel of claim 1, wherein the non-discharge area is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell. The plasma display panel of claim 4, wherein the non-discharge area is disposed on a line passing between a horizontal axis and a vertical axis passing through the center of each discharge cell. The plasma display panel of claim 5, wherein the non-discharge region is disposed at a portion where lines passing between the horizontal and vertical axes passing through the centers of the discharge cells intersect. The plasma display panel of claim 1, wherein the non-discharge regions are formed to have independent cell structures by the partition walls. 8. The plasma display panel of claim 7, wherein each non-discharge area having the cell structure is divided into a plurality of cells. The plasma display panel of claim 1, wherein the pair of discharge cells adjacent in the discharge sustaining electrode direction share at least one partition wall.

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