KR100472369B1 - Plasma display panel and method for fabrication the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a method of manufacturing the same, wherein a blue substance is added to a transparent electrode used as an electrode to improve blue color purity.

The plasma display panel includes a blue transparent electrode to which neodymium (Nd) is added in each of the red discharge cells, the green discharge cells, and the blue discharge cells, and a metal electrode formed on the blue transparent electrodes. .

By such a configuration, the present invention can improve the color purity of blue by adding a material such as neodymium (Nd) that acts as a blue filter to the transparent electrode.

Description

Plasma display panel and manufacturing method thereof {PLASMA DISPLAY PANEL AND METHOD FOR FABRICATION 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 and a method of manufacturing the same, by adding a blue substance to a transparent electrode used as an electrode to improve blue color purity.

Plasma Display Panel (hereinafter referred to as "PDP") is an ultraviolet light generated when an inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne, etc. discharges to display an image by emitting phosphors. do. Such PDPs are not only thin and large in size, but also have improved in image quality due to recent technology development.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP includes a sustain electrode pair including a scan electrode 30Y and a common sustain electrode 30Z formed on the upper substrate 10; An address electrode 20X is formed on the lower substrate 18 so as to be orthogonal to the sustain electrode pair.

Each of the scan electrode 30Y and the common sustain electrode 30Z has a structure in which transparent electrodes 12Y and 12Z and metal bus electrodes 13Y and 13Z are stacked as shown in FIG. 2. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan electrode 30Y and the common sustain electrode 30Z side by side. Wall charges generated during plasma discharge are accumulated in the upper dielectric layer 14. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge, and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode 20X is formed, and the phosphor layer 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode 20X is formed in a direction crossing the scan electrode 30Y and the common sustain electrode 30Z. The partition wall 24 is formed in parallel with the address electrode 20X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. An inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. For this purpose, the phosphor layer 26 is divided into a red (R) phosphor, a green (G) phosphor, and a blue (B) phosphor.

In order for the phosphor 26 to be excited at a specific wavelength band to generate sufficient visible light That is, in order to improve the brightness of the PDP, the current saturation characteristic, the deterioration characteristic, the color purity, the afterglow characteristic, the driving voltage and the resistive force should be preferably provided.

Each of the red (R) phosphor, the green (G) phosphor, and the blue (B) phosphor has high luminance in the order of blue (B), green (G), and red (R), and blue (B), Red (R) and green (G) in order to have a high color purity. For this reason, in order to improve the color purity of the blue (B) phosphor having the lowest color purity, there is a disadvantage that a color filter of blue (B) (not shown) must be formed on the upper dielectric layer 14 or another layer.

Accordingly, it is an object of the present invention to provide a plasma display panel and a method of manufacturing the same, by adding a blue material to a transparent electrode used as an electrode to improve blue color purity.

In order to achieve the above object, a plasma display panel according to an embodiment of the present invention is a blue transparent electrode with neodymium (Nd) is added in each of the red discharge cell, green discharge cell and blue discharge cell, and the blue transparent electrode on the It is provided with a metal electrode formed on. A plasma display panel according to another embodiment of the present invention includes a blue transparent electrode to which neodymium (Nd) is added in a blue discharge cell, and a metal electrode formed on the blue transparent electrode. The neodymium (Nd) is added to the transparent electrode in the range of 10 to 30 mol%. In the method of manufacturing a plasma display panel according to an embodiment of the present invention, a blue transparent electrode in which neodymium (Nd) is added is formed on a substrate in each of a red discharge cell, a green discharge cell, and a blue discharge cell, and is formed on the blue transparent electrode. Forming a sustain electrode pair by forming a metal electrode on the substrate; forming a dielectric layer on the substrate to cover the sustain electrode pair; and forming a protective layer on the dielectric layer. In a method of manufacturing a plasma display panel according to another embodiment of the present invention, a blue transparent electrode to which neodymium (Nd) is added is formed on a substrate in a blue discharge cell, and a metal electrode is formed on the blue transparent electrode to form the blue electrode. Providing a sustain electrode pair of discharge cells, forming a dielectric layer on the substrate to cover the sustain electrode pair, and forming a protective layer on the dielectric layer. The manufacturing method includes forming a transparent transparent electrode to which the neodymium (Nd) is not added in the red discharge cell and the green discharge cell, and forming a metal electrode on the transparent transparent electrode to form the red discharge cell and the green discharge cell. Providing a sustain electrode pair. The dielectric layer covers the sustain electrode pairs of the red discharge cell and the green discharge cell. The transparent electrodes are formed by screen printing.

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

Referring to Figures 3 and 4 will be described a preferred embodiment of the present invention.

Referring to FIG. 3, a discharge cell of a plasma display panel according to an exemplary embodiment of the present invention includes a sustain electrode pair including a scan electrode 60Y and a common sustain electrode 60Z formed on an upper substrate 40, and a sustain electrode. An address electrode 50X is formed on the lower substrate 48 so as to be orthogonal to the pair.

Each of the scan electrode 60Y and the common sustain electrode 60Z has a structure in which transparent electrodes 42Y and 42Z and metal bus electrodes 43Y and 43Z are stacked. In this case, in the red discharge cell, the green discharge cell, and the blue discharge cell, the transparent electrodes 42Y and 42Z of each of the scan electrode 60Y and the common sustain electrode 60Z are transparent conductive materials, for example, indium tin oxide (ITO). It is formed by doping (Nd) a material that is blue in color, that is, neodymium (Nd).

In detail, as shown in FIG. 4, a method for manufacturing a plasma display panel includes a material capable of performing a blue filter such as neodymium (Nd) on ITO, which is a transparent conductive material, by a diffusion method, an alloying method, an ion implantation method, or the like. ~ 30 mol% is added. As such, the ITO doped with neodymium (Nd) or the like is formed of the transparent electrodes 42Y and 42Z of each of the scan electrode 60Y and the common sustain electrode 60Z. Here, neodymium (Nd) uses neodymium oxide (Nd ₂ O ₃ ).

In the method of manufacturing the transparent electrodes 42Y and 42Z, _first , about 10 to 30 mol% of rare earth oxide neodymium oxide (Nd ₂ O ₃ ) is added to ITO, which is an electrode material of the transparent electrodes 42Y and 42Z, in a platinum furnace. After melting at a temperature around 1,400 ℃ synthesized pulverized choja.

Then, the synthesized choza was mixed with a terpineol organic solvent and an ethyl cellulose resin to form an ITO paste for transparent electrodes 42Y and 42Z. The ITO pastes for the transparent electrodes 42Y and 42Z are screen-printed two to three times by screen printing or the like on the upper substrate 40 to be thick-film fired, thereby respectively scanning the scan electrodes 60Y and the common sustain electrode 60Z. Transparent electrodes 42Y and 42Z are formed.

The upper dielectric layer 44 and the upper substrate 40 having the scan electrode 60Y including the transparent electrodes 42Y and 42Z doped with neodymium (Nd) acting as a blue filter and the common sustain electrode 60Z side by side. The protective film 46 is laminated. In the upper dielectric layer 44, wall charges generated during plasma discharge are accumulated. The passivation layer 46 prevents damage to the upper dielectric layer 44 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 46, magnesium oxide (MgO) is usually used.

The lower dielectric layer 52 and the partition wall 54 are formed on the lower substrate 48 on which the address electrode 50X is formed, and the phosphor layer 56 is coated on the surfaces of the lower dielectric layer 52 and the partition wall 54. The address electrode 50X crosses the scan electrode 60Y and the common sustain electrode 60Z. Is formed in the direction. The partition wall 54 is formed in parallel with the address electrode 50X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. An inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is injected into the discharge space provided between the upper and lower substrates 40 and 48 and the partition wall 54.

The phosphor layer 56 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. To this end, the phosphor layer 56 is divided into a red (R) phosphor, a green (G) phosphor, and a blue (B) phosphor.

In order for the phosphor 56 to be excited in a specific wavelength band to generate sufficient visible light, that is, to improve the luminance of the PDP, current saturation characteristics, deterioration characteristics, color purity, afterglow characteristics, driving voltage, and resistance should be provided.

Each of the red (R) phosphor, the green (G) phosphor, and the blue (B) phosphor has high luminance in the order of blue (B), green (G), and red (R), and blue (B), Red (R) and green (G) in order to have a high color purity. The blue visible light generated by the blue (B) phosphor having the lowest color purity is transparent to the scan electrode 62Y doped with neodymium (Nd) or the like formed on the upper substrate 40 and the common sustain electrode 62Z. The color purity is improved by passing through (42Y, 42Z).

In detail, when the wavelength of visible light generated from the red (R) phosphor, the green (G) phosphor, and the blue (B) phosphor is 300 nm or more, all of the upper dielectric layers 44 are transmitted as shown in FIG. 5. The wavelengths of the red (R), green (G), and blue (B) visible light transmitted through the upper dielectric layer 44 are respectively the scan electrode 62Y to which neodymium (Nd) is added. The transparent electrodes 42Y and 42Z of the common sustain electrode 62Z penetrate to each other to show transmittances as shown in FIG. 6.

In detail, Neodymium (Nd) added about 10 to 30 mol% to ITO of the transparent electrodes 42Y and 42Z when using blue light having a light emitting peak of 450 nm, green having 545 nm, and red having 590 nm, 612 nm, and 626 nm as the phosphor for PDP. That is, the transparent electrodes 42Y and 42Z to which neodymium oxide (Nd ₂ O ₃ ) is added do not significantly affect the transmittance of green G, and block orange visible light having a wavelength of about 580 nm to 600 nm. On the other hand, neodymium oxide (Nd ₂ O ₃ ) greatly decreases the transmittance of blue (B) visible light having a wavelength of about 450 nm, but does not affect the transmittance of blue (B) visible light having a wavelength of 480 nm. Therefore, considering that the wavelengths of the standard light for red (R), green (G), and blue (B) are 650 nm, 545 nm, and 480 nm, respectively, ITO added with neodymium oxide (Nd ₂ O ₃ ) has a color purity of blue. Can improve. Therefore, since the orange visible light region disappears, the color purity of the red (R), green (G), and blue (B) visible light is improved. Accordingly, the color temperature of the red (R), green (G), and blue (B) visible light is increased to enable accurate color expression.

Meanwhile, referring to FIG. 7, the plasma display panel according to the second exemplary embodiment of the present invention uses ITO, which is a transparent electrode material, to the red (R) and green (G) discharge cells separated by the partition wall 74. 72Y and 72Z are formed, and transparent electrodes 72Y and 72Z are formed in the blue (B) discharge cell using ITO to which neodymium oxide (Nd ₂ O ₃ ) is added. That is, the transparent electrodes 72Y and 72Z of the scan electrode 70Y and the common sustain electrode 70Z formed in each of the red (R) and green (G) discharge cells are formed of ITO to form red (R) and green (G). ) Do not affect the transmission of visible light. On the other hand, in the blue (B) discharge cells having the lowest color purity, neodymium oxide (Nd ₂ O ₃ ) is added to the transparent electrodes 72Y and 72Z of the scan electrode 70Y and the common sustain electrode 70Z, and thus the color purity of the blue visible light. Will improve.

Accordingly, the transparent electrodes 72Y and 72Z of the scan electrode 70Y and the common sustain electrode 70Z formed by adding neodymium oxide (Nd ₂ O ₃ ) to the blue (B) discharge cell have a wavelength of about 450 nm. While the transmittance of blue (B) visible light is greatly reduced, it does not affect the transmittance of blue (B) visible light having a wavelength of 480 nm. Therefore, considering that the wavelengths of the standard light for red (R), green (G), and blue (B) are 650 nm, 545 nm, and 480 nm, respectively, ITO added with neodymium oxide (Nd ₂ O ₃ ) has a color purity of blue. Can be improved.

Referring to FIGS. 8A and 8B, in the method of manufacturing a plasma display panel according to an exemplary embodiment of the present invention, first, ITO and ITO containing about 10 to 30 mol% of neodymium oxide (Nd ₂ O ₃ ) are prepared.

Then, as shown in FIG. 8A, the blue discharge cell region is blocked with a mask 74, and ITO, which is a transparent electrode material, is fired in a thick film form on the red and green discharge cells using a screen printing method. And 70Y and 70Z, respectively.

Subsequently, each of the red and green discharge cells is blocked with a mask 74, and the ITO, in which neodymium oxide (Nd ₂ O ₃ ) is added to the blue discharge cells, is formed into a thick film by using a screen printing method. And 70Z, respectively, are connected to each of the primary transparent electrodes 70Y and 70Z.

As described above, the red and green discharge cells form a transparent electrode using ITO, which is a transparent electrode material, and the transparent electrode is formed using ITO added with neodymium oxide (Nd ₂ O ₃ ), which acts as a blue filter only on the blue discharge cells. By forming, the color purity of blue visible light can be improved.

As described above, the plasma display panel and the method of manufacturing the same according to the embodiment of the present invention can improve the color purity of blue by adding a material such as neodymium (Nd) that acts as a blue filter to the transparent electrode.

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 perspective view showing a discharge cell of a conventional three-electrode plasma display panel.

FIG. 2 is a plan view illustrating a scan electrode and a common sustain electrode shown in FIG. 1; FIG.

3 is a perspective view illustrating a discharge cell of a three-electrode plasma display panel according to an exemplary embodiment of the present invention.

4 is a plan view showing a transparent electrode to which neodymium is added according to a first embodiment of the present invention.

FIG. 5 is a waveform diagram showing wavelengths passing through the upper dielectric layer shown in FIG.

6 is a waveform diagram illustrating wavelengths of visible light passing through a neodymium-containing transparent electrode according to a first embodiment of the present invention.

7 is a plan view showing that the neodymium-added transparent electrode according to the second embodiment of the present invention is formed only in the blue discharge cell.

8A and 8B are cross-sectional views illustrating a method of manufacturing a plasma display panel according to a second embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10, 40, 72: upper substrate 12, 42: lower substrate

30Y, 60Y, 70Y: scan electrode 30Z, 60Z, 70Z: common sustain electrode

14, 44: upper dielectric layer 16, 46: protective film

20X, 50X: address electrode 22, 52: lower dielectric layer

24, 54, 74: partition 26, 56: phosphor layer

76: mask

Claims (15)

A plasma display panel in which a red discharge cell, a green discharge cell, and a blue discharge cell are formed to display a color image, and each of the discharge cells has a sustain electrode pair and an address electrode intersecting the sustain electrode pair. In each of the red discharge cell, the green discharge cell and the blue discharge cell, Blue transparent electrode with neodymium (Nd) added, And a metal electrode formed on the blue transparent electrode. delete The method of claim 1, The neodymium (Nd) is added to the transparent electrode in the range of 10 to 30 mol% plasma display panel. A plasma display panel in which a red discharge cell, a green discharge cell, and a blue discharge cell are formed to display a color image, and each of the discharge cells has a sustain electrode pair and an address electrode intersecting the sustain electrode pair. In the blue discharge cell, Blue transparent electrode with neodymium (Nd) added, And a metal electrode formed on the blue transparent electrode. delete The method of claim 4, wherein The neodymium (Nd) is added to the transparent electrode in the range of 10 to 30 mol% plasma display panel. In the method of manufacturing a plasma display panel in which a red discharge cell, a green discharge cell and a blue discharge cell are formed to display a color image, In each of the red discharge cell, the green discharge cell, and the blue discharge cell, a pair of sustain electrodes is formed by forming a blue transparent electrode on which a neodymium (Nd) is added and a metal electrode on the blue transparent electrode. To do that, Forming a dielectric layer on the substrate to cover the sustain electrode pairs; Forming a protective layer on the dielectric layer. delete The method of claim 7, wherein The neodymium (Nd) is added to the transparent electrode in the range of 10 to 30 mol% manufacturing method of the plasma display panel. The method of claim 7, wherein The blue transparent electrode is formed by a screen printing method. In the method of manufacturing a plasma display panel in which a red discharge cell, a green discharge cell and a blue discharge cell are formed to display a color image, Forming a blue transparent electrode to which neodymium (Nd) is added on a substrate in the blue discharge cell and forming a metal electrode on the blue transparent electrode to provide a sustain electrode pair of the blue discharge cell; Forming a dielectric layer on the substrate to cover the sustain electrode pairs; Forming a protective layer on the dielectric layer. The method of claim 11, Forming a transparent transparent electrode to which the neodymium (Nd) is not added in the red discharge cell and the green discharge cell and forming a metal electrode on the transparent transparent electrode to form a sustain electrode pair of the red discharge cell and the green discharge cell. Further comprising preparing, And the dielectric layer covers the sustain electrode pairs of the red discharge cells and the green discharge cells. delete The method of claim 11, The neodymium (Nd) is added to the blue transparent electrode in the range of 10 to 30 mol%. The method of claim 12, The transparent electrodes are formed by a screen printing method.