KR100612627B1 - Plasma display panel - Google Patents

Abstract

The present invention is to provide a plasma display panel that can improve contrast by providing a partition wall capable of effectively absorbing external light, the plasma display panel comprising: a first substrate and a second substrate facing each other; Discharge sustaining electrodes and address electrodes provided on the first and second substrates, respectively; A partition wall disposed in a space between the first and second substrates to partition the plurality of discharge cells and the non-discharge regions; And a phosphor layer formed in each discharge cell, wherein the partition includes a color pigment selected from the group consisting of colorable metal oxides, carbon-based materials, and mixtures thereof.

Plasma display panel, green phosphor, discharge stability, lifetime

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a partially exploded perspective view of a conventional plasma display panel.

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

3 is a partial plan view of a plasma display panel according to an embodiment of the present invention.

4 is a cross-sectional view of the first substrate of the plasma display panel shown in FIG. 2.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having excellent contrast by including partition walls capable of absorbing external light.

In general, a plasma display panel (PDP) is a display device that realizes an arbitrary image by exciting phosphors by vacuum ultraviolet rays caused by gas discharge occurring in a discharge cell. This makes it possible to attract attention as the next generation of thin display devices.

1 is a partially exploded perspective view of a PDP according to the prior art. Referring to the drawings, in the conventional PDP, address electrodes 3 are formed along one direction (Y direction in the drawing) on the rear substrate 1, and cover the address electrodes 3 to cover the rear substrate 1. The dielectric layer 5 is formed on the front side. A stripe-shaped partition wall 7 is formed between the address electrodes 3 on the dielectric layer 5, and red (R), green (G), and blue (B) fluorescence are formed between the partition walls 7. Layer 9 is located.

One surface of the front substrate 11 facing the rear substrate 1 includes a pair of transparent electrodes 13a and a bus electrode 13b along a direction orthogonal to the address electrode 3 (the X direction in the drawing). Discharge sustaining electrodes 13 are formed, and the transparent dielectric layer 15 and the MgO passivation layer 17 are disposed on the entire front substrate 11 while covering the discharge sustaining electrodes 13. As a result, the intersection of the address electrode 3 and the discharge sustaining electrode 13 constitutes a discharge cell, and the discharge cells are filled with discharge gas.

With this configuration, the address discharge is applied by applying the address voltage Va between the address electrode 3 and any one of the discharge sustaining electrodes 13, and the sustain voltage Vs is again generated between the pair of discharge sustaining electrodes 13. ), The vacuum ultraviolet rays generated during the sustain discharge excite the fluorescent layer 9 to emit visible light through the transparent front substrate 11.

In the conventional PDP operating as described above, as the front substrate 11 is made of a transparent glass material, external light reflection is inevitably caused. External light reflection occurs when light generated outside the PDP reaches the discharge cells through the front substrate 11 and is reflected on the surface of the fluorescent layer 9 or the dielectric layer 5 and when reflected outside the front substrate 11. It can be explained by dividing by.

First, when external light reaches the discharge cell and is reflected from the surface of the fluorescent layer 9 or the dielectric layer 5, the brightness of the black display is high, so that the dark room contrast of the screen is lowered. When the external light is reflected from the outside of the front substrate 11, a part of the screen is hidden and not visible due to the external light reflection, which causes a problem that the clear room contrast of the screen is lowered.

Therefore, in the conventional PDP, a black blocking film 19 is formed between the discharge sustaining electrodes 13 to block external light incident through the front substrate 11. Conventional techniques related to the blocking film 19 include plasma display panels disclosed in Japanese Patent Laid-Open Nos. 2003-100222 and 2003-132796, plasma display devices disclosed in Japanese Laid-Open Patent Publication No. 2003-068215, and A manufacturing method is mentioned.

However, in the configuration in which the black blocking film 19 is located inside the PDP described in the above publication, since the blocking film 19 is disposed adjacent to the discharge cell, the light blocking material constituting the blocking film 19 is applied to the discharge mechanism of the discharge cell. There is a possibility that abnormal discharge occurs in the discharge cell.

In the above-described configuration, the blocking film 19 is formed and baked after the electrode is formed, or the electrode and the blocking film 19 are formed at the same time to complete the blocking film 19. As equipment is required, it acts as a factor that makes PDP manufacturing difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a plasma display panel capable of improving contrast by providing a partition wall capable of absorbing external light effectively.

In order to achieve the above object, the present invention comprises a first and second substrate facing each other; Discharge sustaining electrodes and address electrodes provided on the first and second substrates, respectively; A partition wall disposed in a space between the first and second substrates to partition the plurality of discharge cells and the non-discharge regions; And a phosphor layer formed in each discharge cell, wherein the partition includes a color pigment selected from the group consisting of colorable metal oxides, carbon-based materials, and mixtures thereof.

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

In the plasma display panel illustrated in FIG. 1, the partition wall 7 disposed on the rear substrate 1 secures a discharge space, prevents cross talk between each discharge cell, and discharges from external pressure when sealing the upper plate and the lower plate. It acts to maintain space. In the present invention, by adding a coloring pigment selected from the group consisting of colorable metal oxides, carbon-based materials and mixtures thereof to the partition wall to reduce the reflection of external light incident from the outside of the plasma display panel to improve the clear contrast of the screen .

The metal oxide pigments include iron (Fe), ruthenium (Ru), titanium (Ti), nickel (Ni), chromium (Cr), manganese (Mn), molybdenum (Mo), cobalt (Co), neodymium (Nd) An oxide containing a metal selected from the group consisting of or a mixture thereof can be used. Preferred examples thereof include black pigments such as FeO, Fe ₃ O ₄ , RuO ₂ , TiO, Ti ₃ O ₅ , Ni ₂ O ₃ , CrO ₂ , MnO ₂ , Mn ₂ O ₃ , Mo ₂ O ₃ , and Co ₂ O Blue pigments such as ₃ , CoO, Nd ₂ O _3, and the like. The use of a double blue pigment can achieve the effect of improving the color purity and color temperature of the panel. As the carbon-based pigment, carbon black or graphite may be used. In the present invention, the metal oxide pigment may be added by forming a partition by adding to a conventional partition paste. That is, the partition can be formed by adding the colored pigment to the glass powder such as PbO, SiO ₂ , B ₂ O ₃ , CaO, BaO and the like used as the partition material. The colored pigment is dispersed in a glass powder matrix.

The colored pigment is preferably used in an amount of 3 to 15 parts by weight based on 100 parts by weight of the glass powder. If the amount of the colored pigment is less than 3 parts by weight, the effect of improving the contrast is insignificant, and if it is more than 15 parts by weight, problems such as leveling and dispersibility of the paste are undesirable.

The above may further include ceramic fillers such as Al ₂ O ₃ , Ti0 ₂ , CrO, ZnO, CuO, mullite, magnesia, cordierite, and the like. It is preferable that the average particle diameter of the said filler is 0.1-10 micrometers.

As shown in FIG. 1, the partition wall of the present invention may be a stripe-shaped partition wall, or may be a waffle, meander, or honeycomb-type shielded partition wall according to demand of a high-quality PDP. have.

In a preferred embodiment of the present invention, the plasma display panel includes: a first substrate and a second substrate disposed to face each other; Address electrodes formed on the first 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 discharge cell; And discharge sustain electrodes formed on the second substrate, wherein the non-discharge region is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell; The discharge sustaining electrode is disposed so as to have a pair of bus electrodes corresponding to each of the discharge cells and a pair extending from the bus electrode to the inside of each of the discharge cells, and to form a concave portion in the center of the opposing surface where the pair face each other. And a protruding electrode, wherein the partition includes a color pigment selected from the group consisting of colorable metal oxides, carbon-based materials, and mixtures thereof.

In the plasma display panel of the present invention, the discharge cells are formed narrower as the widths of both ends positioned along the electrode direction become farther from the center of the discharge cells. The non-discharge area may be formed such that its center coincides with the center of the area surrounded by the horizontal axis and the vertical axis.

The partition wall includes a first partition wall member in a direction parallel to the address electrode and a second partition wall member connecting the first partition wall members without being parallel to the address electrode, wherein the second partition wall member is defined by the first partition wall member. It is formed to intersect with an inclination angle.

The protruding electrode is formed to be narrower as the rear ends corresponding to both ends of the discharge cell move away from the center of the discharge cell. Preferably, the protruding electrodes are parallel to the inner wall of the discharge cell on both sides of the rear end corresponding to both ends of the discharge cell. Is formed.

The pair of protruding electrodes are positioned with the first discharge gap interposed therebetween by the concave portion corresponding to the center of each discharge cell, and with the second discharge gap smaller than the first discharge gap corresponding to the outer portion of the discharge cell. Located.

Hereinafter, with reference to the accompanying drawings will be described in detail the plasma display panel according to the preferred embodiment.

2 is a partially exploded perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIGS. 3 and 4 are partial plan views and partial cross-sectional views respectively illustrating an assembled state of FIG. 1.

Referring to the drawings, in the plasma display panel according to the present embodiment, the first substrate 2 and the second substrate 4 are disposed to face each other at random intervals, and discharge cells 6R and 6G are disposed in the space between the two substrates. And 6B), a non-discharge region 8 is provided.

First, address electrodes 10 are formed on one inner surface of the first substrate 2 in one direction (the Y direction in the drawing), and the lower dielectric layer (over the entire inner surface of the first substrate 2 is covered while covering the address electrodes 10. 12) is formed. For example, the address electrodes 10 are formed in a stripe pattern and are formed to be parallel to each other with a neighboring address electrode 10 at a predetermined interval.

The partition wall 14 is disposed on the lower dielectric layer 12 to partition the discharge cells 6R, 6G, and 6B and the non-discharge region 8. Here, the discharge cells 6R, 6G, 6B are spaces intended to cause gas discharge and light emission therein, and the non-discharge regions 8 mean areas or spaces where gas discharge and light emission are not intended. 2 and 3 show an embodiment in which the discharge cells 6R, 6G, 6B and the non-discharge regions 8 are each formed to have independent cell structures.

More specifically, the partition wall 14 partitions the discharge cells 6R, 6G, and 6B along the direction of the address electrode 10 and the direction orthogonal to the address electrode 10 (the X direction in the drawing), and each discharge The cells 6R, 6G and 6B have an optimized shape in consideration of the diffusion form of the discharge gas. In addition, assuming a virtual horizontal axis H and a vertical axis V passing through the centers of the respective discharge cells 6R, 6G, and 6B, the non-discharge area (in the region surrounded by the horizontal axis H and the vertical axis V) 8) is located.

The optimized structure of the discharge cells 6R, 6G, and 6B is a shape in which each of the discharge cells 6R, 6G, and 6B substantially minimizes a small degree of contribution to sustain discharge and brightness enhancement. It means a shape in which the widths of both ends positioned in the direction of the address electrode 10 in each of the discharge cells 6R, 6G, and 6B become narrower as they move away from the center of the discharge cells 6R, 6G, and 6B.

That is, referring to FIG. 2, the width Wc at the center of the discharge cells 6R, 6G, and 6B is made larger than the width We at the end, and the width We at the end is the discharge cell 6R, 6G, 6B) shows a characteristic that becomes narrower away from the center. As a result, both ends of the discharge cells 6R, 6G, 6B have a trapezoidal shape, and the overall planar shape of each discharge cell 6R, 6G, 6B is octagonal.

As a result, the partition wall 14 may include a first partition wall member 14a in a direction parallel to the address electrode 10 and a second partition wall member connecting the first partition wall members 14a without being parallel to the address electrode 10. 14b, in the present embodiment, the second partition member 14b is formed to intersect the first partition member 14a at a predetermined inclination angle. In particular, in the present embodiment, the second partition wall member 14b has an approximately X-shape between discharge cells neighboring in the direction of the address electrode 10.

Red, green, and blue phosphors are applied to the discharge cells 6R, 6G, and 6B to form the fluorescent layers 16R, 16G, and 16B. Referring to FIG. 4, in this embodiment, the depth measured from the upper end of the partition wall 14 at both ends of the discharge cell 6R located in the direction of the address electrode 10 is farther away from the center of the discharge cell 6R. It is formed small. That is, the depth de at the end of the discharge cell 6R is smaller than the depth dc at the center, and the depth de at the end becomes gradually shallower as it moves away from the center of the discharge cell 6R. The depth of this discharge cell is equally applied to the red discharge cell and the blue discharge cell.

In the present invention, the partition wall may be formed according to a conventional method, and preferably may be formed on the back substrate by screen printing, sand blasting or etching.

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

(Example 1)

Mixed solvent of terpineol and butyl carbitol acetate by adding 13 parts by weight of Fe ₃ O ₄ as a metal oxide pigment to 100 parts by weight of glass powder containing the same amount of PbO, SiO ₂ , and B ₂ O ₃ . The partition paste composition was prepared by dispersing at. The barrier rib paste composition was screen printed on a back substrate having a dielectric layer to prepare a barrier rib. The lower substrate and the upper substrate on which the partition walls are formed are sealed to manufacture the plasma display panel illustrated in FIG. 2.

(Comparative Example 1)

A plasma display panel was manufactured in the same manner as in Example 1, except that no metal oxide pigment was added.

Reflective luminance of the plasma display panels of Example 1 and Comparative Example 1 was measured and described in Table 1 below.

TABLE 1

Reflective brightness (cd / ㎡) Example 1 13.43 Comparative Example 1 18.69

 As described in Table 1, the external light reflectance of Example 1 to which the coloring pigment is added is lower than that of Comparative Example 1, and it can be seen that the contrast is increased by 30 to 40%.

Plasma display panel according to the present invention can improve the contrast by 28% or more by absorbing the external light incident from the outside by including a colored partition wall.

Claims (16)

A front substrate and a rear substrate disposed to face each other; Address electrodes provided on the rear substrate and discharge sustaining electrodes provided on the front substrate; A partition wall disposed in a space between the front substrate and the rear substrate and installed on the rear substrate to partition a plurality of discharge cells; And A red, green, and blue phosphor layer formed in the discharge cell partitioned by the partition wall; The partition wall includes a color pigment selected from the group consisting of colorable metal oxides, carbon-based materials and mixtures thereof in the entire partition wall. The method of claim 1, wherein the metal oxide is iron (Fe), ruthenium (Ru), titanium (Ti), nickel (Ni), chromium (Cr), manganese (Mn), molybdenum (Mo), cobalt (Co), A plasma display panel selected from the group consisting of oxides containing metals selected from the group consisting of neodymium (Nd) and mixtures thereof. The method of claim 2, wherein the metal oxide is FeO, Fe ₃ O ₄ , RuO ₂ , TiO, Ti ₃ O ₅ , Ni ₂ O ₃ , CrO ₂ , MnO ₂ , Mn ₂ O ₃ , Mo ₂ O ₃ , Co ₂ A plasma display panel selected from the group consisting of O ₃ , CoO, Nd ₂ O _3, and mixtures thereof. The plasma display panel of claim 1, wherein the carbonaceous material is selected from the group consisting of carbon black, graphite, and mixtures thereof. The plasma display panel of claim 1, wherein the colored pigment is present in an amount of 3 to 15 parts by weight based on 100 parts by weight of the glass powder. The plasma display panel of claim 1, wherein the barrier rib further comprises a ceramic filler selected from the group consisting of Al ₂ O ₃ , Ti0 ₂ , CrO, ZnO, CuO, mullite, magnesia, cordierite, and mixtures thereof. The plasma display panel of claim 6, wherein the filler has an average particle diameter of about 0.1 μm to about 10 μm. The plasma display panel of claim 1, wherein the partition wall is a stripe or closed partition wall. A front substrate and a rear substrate disposed to face each other; Address electrodes provided on the rear substrate and discharge sustaining electrodes provided on the front substrate; A partition wall disposed in a space between the front substrate and the rear substrate and installed on the rear substrate to partition a plurality of discharge cells; And A red, green, and blue phosphor layer formed in the discharge cell partitioned by the partition wall; The non-discharge regions are disposed in a region surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell; The discharge sustaining electrode is disposed so as to have a pair of bus electrodes corresponding to each of the discharge cells and a pair extending from the bus electrode to the inside of each of the discharge cells, and to form a concave portion in the center of the opposing surface where the pair face each other. A protruding electrode, The partition wall includes a color pigment selected from the group consisting of colorable metal oxides, carbon-based materials and mixtures thereof in the entire partition wall. The method of claim 9, wherein the metal oxide is iron (Fe), ruthenium (Ru), titanium (Ti), nickel (Ni), chromium (Cr), manganese (Mn), molybdenum (Mo), cobalt (Co), A plasma display panel selected from the group consisting of oxides containing metals selected from the group consisting of neodymium (Nd) and mixtures thereof. The method of claim 9, wherein the metal oxide is FeO, Fe ₃ O ₄ , RuO ₂ , TiO, Ti ₃ O ₅ , Ni ₂ O ₃ , CrO ₂ , MnO ₂ , Mn ₂ O ₃ , Mo ₂ O ₃ , Co ₂ A plasma display panel selected from the group consisting of O ₃ , CoO, Nd ₂ O _3, and mixtures thereof. The plasma display panel of claim 9, wherein the carbonaceous material is selected from the group consisting of carbon black, graphite, and mixtures thereof. The plasma display panel of claim 9, wherein the colored pigment is present in an amount of 3 to 15 parts by weight based on 100 parts by weight of the glass powder. The plasma display panel of claim 9, wherein the barrier rib further comprises a ceramic filler selected from the group consisting of Al ₂ O ₃ , Ti0 ₂ , CrO, ZnO, CuO, mullite, magnesia, cordierite, and mixtures thereof. The plasma display panel of claim 14, wherein the filler has an average particle diameter of about 0.1 μm to about 10 μm. 10. The plasma display panel of claim 9, wherein the non-discharge area is formed so that its center coincides with the center of the area surrounded by the horizontal axis and the vertical axis.

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