KR100520834B1 - Plasma display panel and method of fabricating the same - Google Patents

Abstract

The present invention relates to a plasma display panel and a method of manufacturing the same that can improve the brightness and contrast ratio.

The present invention provides an address electrode; First and second electrodes formed to intersect the address electrode to define a discharge cell; A partition wall disposed between the first and second electrodes and the address electrode to partition a discharge space of the discharge cell; And a black matrix formed between the discharge cells, wherein the black matrix has a first region overlapping with the partition wall wider than a width of a second region except for the first region.

Description

Plasma display panel and manufacturing method thereof {PLASMA DISPLAY PANEL AND METHOD OF FABRICATING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving brightness and contrast ratio and a method of manufacturing the same.

Recently, Liquid Crystal Display (hereinafter referred to as "LCD"), Field Emission Display (hereinafter referred to as "FED") and Plasma Display Panel (hereinafter referred to as "PDP") Flat display devices such as PDP have been actively developed. Among them, the PDP has a large structure of over 40 inches as well as the ease of fabrication due to its simple structure, high brightness and high luminous efficiency, memory function and wide viewing angle of 160 ° or more. It has the advantage of being able to.

1 is a plan view showing a conventional three-electrode AC surface discharge type PDP, and FIG. 2 is a cross-sectional view showing a discharge cell of the PDP shown in FIG.

1 and 2 illustrate a scan / hold electrode 34Y and a common sustain electrode 34Z formed on the upper substrate 46 and an address electrode 32X formed on the lower substrate 44. Equipped. In Figure 1, the lower substrate 44 is shown rotated 90 °.

The sustain electrode pairs 34Y and 34Z consist of a transparent electrode 34a and a bus electrode 34b. The bus electrode 34b has a double layer structure of the black material layer 34i and the electrode material layer 34j.

The upper dielectric layer 42 and the passivation layer 40 are stacked on the upper substrate 46 having the scan / suspension electrode 34Y and the common sustain electrode 34Z side by side. In the upper dielectric layer 42, wall charges generated during plasma discharge are accumulated.

The passivation layer 40 prevents damage to the upper dielectric layer 42 due to sputtering generated during plasma discharge and increases discharge efficiency of secondary electrons. As the protective film 40, magnesium oxide (MgO) is usually used.

The lower dielectric layer 48 and the partition wall 38 are formed on the lower substrate 44 on which the address electrode 32X is formed, and the phosphor layer 36 is coated on the surfaces of the lower dielectric layer 48 and the partition wall 38. The address electrode 32X is formed in the direction crossing the scan / sustain electrode 34Y and the common sustain electrode 34Z.

The partition wall 38 is formed in parallel with the address electrode 32X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor layer 36 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red (R), green (G), and blue (B). Inert gas for gas discharge is injected into the discharge space provided between the upper substrate 46 / lower substrate 44 and the partition wall 38.

The black matrix 52 is formed in the upper dielectric layer 42 of the PDP in parallel with the sustain electrode pairs 34Y and 34Z in order to improve the contrast ratio of the screen.

The black matrix 52 improves the contrast ratio by absorbing external light and internal transmitted light between adjacent discharge cells. In addition, the black matrix 52 should be black because it is a visible light absorber.

Hereinafter, a method of manufacturing an upper substrate of a plasma display panel according to the related art will be described with reference to FIGS. 3A to 3G.

First, a transparent conductive material is deposited on the upper substrate 46 and then patterned to form a transparent electrode 34a as shown in FIG. 3A. The weakly conductive black material layer 34i is printed and dried on the upper substrate 46 on which the transparent electrode 34a is formed, as shown in FIG. 3B. Subsequently, the black material layer 61 corresponding to the transmission part 60b is exposed on the black material layer 34i by using the mask 60 having the transmission part 60b and the blocking part 60a.

Subsequently, the electrode material layer 34j is printed on the upper substrate 46 on which the partially exposed black material layer 34i is formed, as shown in FIG. 3D, and then dried. Next, as shown in FIG. 3E, the black material layer 34i and the electrode material layer 34j overlapping the transmissive portion 70b are exposed using the mask 70 having the transmissive portion 70b and the blocking portion 70a. The exposed black material layer 34i and the electrode material layer 34j are patterned by a developing process, followed by a firing process to form a bus electrode 34b and a black matrix 52 as shown in FIG. 3F. Here, the bus electrode has a two-layer structure composed of a black material layer 34i and an electrode material layer 34j, and the black matrix 52 has a single layer structure composed of a black material layer 34i.

The upper dielectric layer 42 is formed by applying a dielectric layer material on the upper substrate 46 on which the sustain electrode pairs 34Y and 34Z and the black matrix 52 are formed.

Thereafter, magnesium oxide, which is a protective layer material, is applied on the upper dielectric layer 42 to form the protective film 40 as shown in FIG. 3H.

In the conventional plasma display panel, as shown in FIG. 4 during the plasma discharge, the region A where the discharge occurs is expanded to the region B between the bus electrode 34b and the black matrix 52 of the discharge cell. Therefore, when the line width of the black matrix 52 is wide, the area B between the bus electrode 34b and the black matrix 52 is narrowed, and the aperture ratio is reduced by the narrowed area, thereby decreasing luminance. On the other hand, if the line width of the black matrix 52 is narrow, the absorption power of the external light and the transmitted light between the adjacent discharge cells is weakened, and thus the contrast ratio is lowered.

Therefore, there is a need for a plasma display panel and a method of manufacturing the same that can improve luminance and contrast ratio by forming a black matrix 52 having an appropriate line width at an appropriate position.

Accordingly, an object of the present invention is to provide a plasma display panel and a method of manufacturing the same that can improve the brightness and contrast ratio.

In order to achieve the above object, the plasma display panel according to an embodiment of the present invention and the partition wall for separating the discharge cells; It is characterized by having a black matrix formed between the discharge cells and having a different width depending on the position.

The black matrix is characterized in that the first region overlapping the partition wall is wider than the width of the second region except for the first region.

And a second partition wall intersecting with the partition wall and overlapping the black matrix.

The black matrix is characterized in that the region overlapping the intersection of the partition and the second partition wall is formed to have a wider width than the region overlapping the second partition wall.

A plurality of protrusions extending from the barrier rib and overlapping with the black matrix are included.

The discharge cell includes an address electrode; And first and second electrodes formed in a direction crossing the address electrode.

A method of manufacturing a plasma display panel according to the present invention includes the steps of forming a partition wall for distinguishing discharge cells; And forming a black matrix formed between the discharge cells and having different widths according to positions.

The black matrix may be formed such that the first region overlapping the partition wall is wider than the width of the second region except for the first region.

The forming of the partition wall may further include forming a second partition wall that crosses the partition wall and overlaps the black matrix.

The black matrix is characterized in that the region overlapping with the intersection of the partition and the second partition wall has a wider width than the region overlapping the second partition wall.

The forming of the barrier rib may include forming a plurality of protrusions extending from the barrier rib and overlapping the black matrix.

      Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 9.

FIG. 5 is a plan view showing a three-electrode AC surface discharge type PDP according to a first embodiment of the present invention, and FIG. 6 is a cross-sectional view showing discharge cells of the PDP shown in FIG.

5 and 6 illustrate a scan / hold electrode 134Y and a common sustain electrode 134Z formed on the upper substrate 146, and an address electrode 32X formed on the lower substrate 144. Equipped. In Figure 6, the lower substrate 44 is shown rotated 90 °.

The sustain electrode pairs 134Y and 134Z include a transparent electrode 134a and a bus electrode 134b. The bus electrode 134b has a double layer structure of the black material layer 134i and the electrode material layer 134j.

An upper dielectric layer 142 and a passivation layer 140 are stacked on the upper substrate 146 on which the scan / sustain electrode 134Y and the common sustain electrode 134Z are arranged side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 142.

The passivation layer 140 prevents damage to the upper dielectric layer 142 due to sputtering generated during plasma discharge and increases discharge efficiency of secondary electrons. As the protective film 140, magnesium oxide (MgO) is usually used.

The lower dielectric layer 148 and the partition wall 138 are formed on the lower substrate 144 on which the address electrode 132X is formed, and the phosphor layer 136 is coated on the surfaces of the lower dielectric layer 148 and the partition wall 138. The address electrode 132X is formed in the direction crossing the scan / sustain electrode 134Y and the common sustain electrode 134Z.

The partition wall 138 is formed in parallel with the address electrode 132X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor layer 136 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red (R), green (G), and blue (B). Inert gas for gas discharge is injected into the discharge space provided between the upper substrate 146 and the lower substrate 144 and the partition wall 138.

The upper dielectric layer 142 of the PDP has a fishbone shape black matrix 152 that is parallel to the sustain electrode pairs 134Y and 134Z and has a different line width depending on the position in order to improve the contrast ratio and brightness of the screen. ) Is formed.

Specifically, the black matrix 152 of the region C1 adjacent to the region B1 between the bus electrode 134b and the black matrix 152 and not overlapping the partition wall 138 has a thinner line width than the conventional art. Is formed. As a result, the area B1 between the bus electrode 134b and the black matrix 152 becomes wider, and the aperture ratio is improved by the wider area, thereby improving luminance.

In addition, as a non-discharge space between the discharge cells and the discharge cells, the black matrix 152 in the region D1 overlapping the partition wall 138 is formed to have a wide line width. Accordingly, the absorption ratio of the external light and the transmitted light inside the adjacent discharge cells is improved, thereby improving the contrast ratio.

Hereinafter, a manufacturing method of the upper substrate of the PDP shown in FIG. 6 will be described with reference to the flowchart shown in FIG. 7.

First, a transparent conductive material is deposited on the upper substrate 146 and then patterned to form a transparent electrode 134a. (S2) The transparent electrode 134a is formed on the upper substrate 146 on which the transparent electrode 134a is formed. A layer of weakly conductive black material is printed to cover and dried. Subsequently, the black material layer 161 corresponding to the transmission part is exposed using a mask having the transmission part and the blocking part on the black material layer.

Subsequently, the electrode material layer 134j is printed on the upper substrate 146 on which the partially exposed black material layer 134i is formed, and then dried. Then, the black material layer 134i and the electrode material layer 134j overlapping the transmissive portion are exposed using a mask having the transmissive portion and the blocking portion. The exposed black material layer 134i and the electrode material layer 134j are patterned by a developing process and then subjected to a sintering process so that the line width of the overlapping area with the bus electrode 134b and the partition wall is larger than the line width of the non-overlapping area of the partition wall. A wide black matrix 152 is formed. (1S4) Here, the bus electrode is a two-layer structure consisting of a black material layer 134i and an electrode material layer 134j, and the black matrix 152 is a black material layer 134i. It is a single layer structure.

The upper dielectric layer 142 is formed by applying a dielectric layer material on the upper substrate 146 on which the sustain electrode pairs 134Y and 134Z and the black matrix 152 are formed.

Thereafter, magnesium oxide, which is a protective layer material, is applied on the upper dielectric layer 142 to form a protective film 140 (S8).

As described above, the PDP according to the first embodiment of the present invention is a non-discharge space between the discharge cells and the discharge cells, and the line width of the black matrix 152 in the region D1 overlapping with the partition wall 138 is not equal to the partition wall 138. A black matrix 152 in the form of a fishbone having a line width relatively wider than the line width in the overlapping region C1 is formed. As a result, the area B1 between the bus electrode 134b and the black matrix 152 is widened to increase the aperture ratio, thereby improving brightness and improving absorption of external light and transmitted light between adjacent discharge cells. The rain is improved.

8 is a plan view illustrating a PDP according to a second embodiment of the present invention.

The PDP shown in FIG. 8 has the same components except for having a grid-shaped partition wall 148 instead of the strip-shaped partition wall as compared to the PDPs shown in FIGS. 5 and 6. Like reference numerals designate like elements and detailed descriptions thereof will be omitted.

In the PDP illustrated in FIG. 8, a lattice-shaped partition wall 148 formed to surround a discharge cell is formed. The grid-shaped partition wall 148 has a large coating area of the phosphor, thereby improving luminance.

The black matrix 152 is formed to overlap the horizontal partition wall 148a and is a non-discharge space between the discharge cell and the discharge cell, and the line width of the area D2 overlapping the intersection of the horizontal partition wall 148a and the vertical partition wall 148b. It is formed in the shape of a fishbone relatively wider than the line width of the region C2 overlapping the horizontal partition wall 148a.

As described above, the black matrix 152 formed in the non-discharge space between the discharge cells and the discharge cells is formed wide, so that the absorption power of the external light and the transmitted light between the adjacent discharge cells is improved. As a result, the contrast ratio of the PDP is improved.

In the manufacturing method of the PDP according to the second embodiment of the present invention, a lattice-shaped partition wall 148 is formed and an intersection of the horizontal partition wall 148a and the vertical partition wall 148b as compared with the manufacturing method of the PDP according to the first embodiment. The line width of the black matrix 152 of the region D2 overlapping with is formed by the same method except that the line width of the black matrix 152 is larger than the line width of the region C2 overlapping the horizontal partition wall 148a.

9 is a plan view illustrating a PDP according to a third embodiment of the present invention.

The PDP shown in FIG. 9 has the same components except for having the fishbone-type partition wall 158 instead of the stripe-type partition wall as compared to the PDP shown in FIGS. 5 and 6. The same reference numerals are used to refer to the same elements as in FIG. 6, and a detailed description thereof will be omitted.

The fishbone-type partition wall 158 extends to both of the first partition wall 158a formed in a stripe form parallel to the address electrode 132X, and in the non-discharge space between the discharge cell and the discharge cell. It is provided with the protrusion 158b. In the fishbone partition wall 158, a phosphor is formed on the surface of the protrusion 158b, thereby improving the coating area. As a result, the luminance of the PDP is improved. In addition, since the air is exhausted through a predetermined space during the exhaust process, there is an advantage that the exhaust process can be easily performed as compared to the lattice partition.

The black matrix 152 is adjacent to the region B between the bus electrode 134b and the black matrix 152 and at the same time, the black matrix 152 of the region C3 that does not overlap with the partition wall 138 is larger than the conventional one. It is formed to have a thin line width. As a result, the area B3 between the bus electrode 134b and the black matrix 152 becomes wider, and the aperture ratio is improved by the wider area, thereby improving luminance.

In addition, as a non-discharge space between the discharge cells and the discharge cells, the black matrix 152 in the region D3 overlapping the partition wall 158 is formed to have a wide line width. Accordingly, the absorption ratio of the external light and the transmitted light inside the adjacent discharge cells is improved, thereby improving the contrast ratio.

In the manufacturing method of the PDP according to the third embodiment of the present invention, as compared with the manufacturing method of the PDP according to the first embodiment, a fishbone-type partition wall 158 is formed and the first and second partition walls 158a and 158b are formed. The line width of the black matrix 152 of the region D3 overlapping with the intersection portion is formed by the same method except that the line width of the black matrix 152 of the region D3 overlaps with the intersection portion is wider than the line width of the region C3 not overlapping with the fishbone partition wall 158.

As described above, the plasma display panel and the method of manufacturing the same according to the present invention are non-discharge spaces between the discharge cells and the discharge cells, and the line width of the black matrix in the region overlapping with the partition wall is relative to the line width in the non-overlapping region. As a result, a fishbone-type black matrix having a wide line width is formed. As a result, the area between the bus electrode and the black matrix becomes wider, the aperture ratio is improved, and the luminance is improved, and the absorption ratio of the external light and the transmitted light between the adjacent discharge cells is improved, thereby improving the contrast ratio.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a plan view showing a conventional three-electrode alternating current plasma display panel.

FIG. 2 is a cross-sectional view illustrating a discharge cell structure of the plasma display panel shown in FIG. 1. FIG.

3A to 3H are cross-sectional views sequentially illustrating a method of manufacturing a top plate of a conventional plasma display panel.

4 is a diagram for describing a discharge region of a plasma display panel.

5 is a plan view illustrating a three-electrode alternating current plasma display panel according to a first embodiment of the present invention.

6 is a cross-sectional view illustrating a discharge cell structure of the plasma display panel illustrated in FIG. 5.

FIG. 7 is a flowchart illustrating a method of manufacturing the upper substrate of the plasma display panel shown in FIG. 5.

8 is a plan view illustrating a three-electrode alternating current plasma display panel according to a second embodiment of the present invention.

9 is a plan view illustrating a three-electrode alternating current plasma display panel according to a third embodiment of the present invention.

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

32X, 132X: Address electrode 34Y, 134Y: Scan sustain electrode

34Z, 134Z: Common holding electrode 36,136: Phosphor layer

38,138,148,158: bulkhead 40,140: protective film

42,48 dielectric layer 44,144 lower substrate

46: upper substrate 52, 152: black matrix

Claims (11)

An address electrode; First and second electrodes formed to intersect the address electrode to define a discharge cell; A partition wall disposed between the first and second electrodes and the address electrode to partition a discharge space of the discharge cell; A black matrix formed between the discharge cells, And wherein the black matrix has a first region overlapping with the barrier ribs wider than a width of a second region except for the first region. delete The method of claim 1, And a second partition wall which intersects the partition wall and partially overlaps with the black matrix. The method of claim 3, wherein The width of the black matrix at the intersection of the partition and the second partition is And a width larger than a width of the black matrix overlapping the second partition wall. The method of claim 1, And a plurality of protrusions extending from the partition wall and overlapping the black matrix. delete Forming an address electrode; Forming a partition wall parallel to the address electrode; Forming first and second electrodes formed to intersect the address electrode with the partitions interposed therebetween to define discharge cells; And forming a black matrix positioned between the discharge cells and overlapping the partition wall, the black matrix having a wider width than the second region except for the first region. Manufacturing method. delete The method of claim 7, wherein Forming the partition wall And forming a second partition wall which intersects the partition wall and overlaps the black matrix. The method of claim 9, The width of the black matrix at the intersection of the partition and the second partition is And a width of the black matrix overlapping the second partition wall. The method of claim 7, wherein Forming the partition wall And forming a plurality of protrusions extending from the partition wall and overlapping the black matrix.