KR20030008695A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to achieve improved discharge efficiency by permitting phosphors of each barrier rib to emit the same amount of visible light and minimizing destruction of charged particles generated during discharge. CONSTITUTION: A plasma display panel comprises barrier ribs(46), and first and second sustaining electrodes(Y,Z) constituted by metal bus electrodes(43Y,43Z) and transparent electrodes(42Y,42Z). The transparent electrode has a protrusion protruded toward the center of a cell and which has a circular or polygonal shape. The transparent electrode of the first or second sustaining electrode has a protrusion formed within the protrusion of the other transparent electrode. Thus, the length from the discharging space to each barrier rib is formed constant, to thereby allow phosphors of each barrier rib to emit the same amount of visible light.

Description

Plasma Display Panel

The present invention relates to a plasma display panel, and more particularly to a plasma display panel having an electrode structure for improving the discharge efficiency.

Recently, flat display devices such as a liquid crystal display (LCD), a field emission display (FED), and a plasma display panel (hereinafter referred to as "PDP") have been actively developed. . The PDP emits a phosphor by 147 nm ultraviolet rays generated when the He + Xe or Ne + Xe inert mixed gas is discharged, thereby displaying an image including characters or graphics. Such a PDP is not only thin and large in size, but also simple in structure, and has a high luminance and high luminous efficiency as compared to other flat display devices. Due to these advantages, research on PDP is being actively conducted.

The three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge PDP includes a scan electrode Y and a common sustain electrode Z formed on the upper substrate 10, and an address electrode formed on the lower substrate 18. (X) is provided.

Each of the scan electrode Y and the common sustain electrode Z has a line width smaller than that of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z, and is formed at one edge of the transparent electrodes 12Y and 12Z. Metal bus electrodes 13Y and 13Z.

The transparent electrodes 12Y and 12Z are formed on the upper substrate 10 by using a transparent conductive metal, for example, indium tin oxide (hereinafter, referred to as “ITO”). The metal bus electrodes 13Y and 13Z are formed of metals such as chromium (Cr) and formed on the transparent electrodes 12Y and 12Z to reduce voltage drops caused by the transparent electrodes 12Y and 12Z having high resistance.

The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan electrode Y and the common sustain electrode Z side by side. The upper dielectric layer 14 accumulates wall charges generated during plasma discharge. The passivation 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.

In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. 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 address electrode X is perpendicular to the scan electrode Y and the common sustain electrode Z. The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode X is formed. The partition wall 24 is formed in parallel with the address electrode X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 20 is applied to the surfaces of the lower dielectric layer 22 and the partition wall 24. The phosphor layer 20 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue.

An inert mixed gas such as He + Xe or Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 10 and 18 and the partition wall 24.

The discharge cell having such a structure is selected by opposing discharge between the address electrode X and the scan electrode Y, and then maintains the discharge by the surface discharge between the scan electrode X and the common sustain electrode Z. In such a discharge cell, the fluorescent substance 20 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted to the outside of the cell. As a result, the discharge cells adjust the period during which the discharge is maintained to implement gray scale, and the PDP in which the discharge cells are arranged in a matrix form displays an image.

The partition wall 24 of the PDP is divided into a stripe structure shown in FIG. 2 and a well structured partition structure shown in FIG. 3. In the case of the stripe-shaped partition wall 24 structure, the exhaust gas is easily exhausted, but the coating area of the phosphor 20 is small. In the case of the well-shaped partition wall 24, the coating area of the phosphor 20 may be increased to increase luminance, but the exhaust gas may not be well vented.

Discharge cells of a constant width are formed between the stripe-shaped or well-shaped partitions. Since the discharge cells have different discharge voltages and light emission characteristics of phosphors of red (R), green (G) or blue (B), the discharge cells of the discharge cells implementing red (R), green (G) or blue (B) The luminous efficiency is different. In particular, the light emitting efficiency of the discharge cells implementing green (G) is higher than the light emission efficiency of the discharge cells implementing red (R) and blue (B), and the blue light emission efficiency of the discharge cells implementing red (R) ( It has a higher characteristic than the luminous efficiency of the discharge cell to implement B).

Accordingly, in the related art, a white balance is adjusted by adjusting an adjustment point to a discharge cell having the lowest luminous efficiency to achieve a color balance. However, in this case, the overall luminance of the PDP is lowered.

4 is a plan view illustrating a delta partition structure and an electrode structure for improving discharge efficiency.

4 and 5, the discharge cells of the PDP having the delta partition wall structure are formed on the scan electrode Y and the common sustain electrode Z formed on the upper substrate 10, and on the lower substrate 18. The formed address electrode X is provided.

Each of the scan electrode Y and the common sustain electrode Z has a line width smaller than that of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z, and is formed at the center of the transparent electrodes 12Y and 12Z. Bus electrodes 13Y and 13Z.

The transparent electrodes 12Y and 12Z are formed on the upper substrate 10 with a transparent conductive metal, for example, indium tin oxide (hereinafter, referred to as "ITO"). Metal bus electrodes 13Y and 13Z ) Is a metal such as chromium (Cr) formed on the transparent electrodes 12Y and 12Z to reduce voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance.

The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan electrode Y and the common sustain electrode Z side by side. The upper dielectric layer 14 accumulates wall charges generated during plasma discharge. The passivation 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.

In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. 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 address electrode X is perpendicular to the scan electrode Y and the common sustain electrode Z. The lower dielectric layer 22 and the partition wall 26 are formed on the lower substrate 18 on which the address electrode X is formed.

The partition wall 26 is formed parallel to the address electrode X to prevent the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells. Such a partition 26 has a structure in which one cell is surrounded by a sixth surface and connected to narrow channels 34. Accordingly, the coating area of the phosphor (not shown) can be increased to increase luminance, and the exhaust gas is well vented through the narrow channel 34.

Phosphors are applied to the surfaces of the lower dielectric layers 22 and the partition walls 26. The phosphor is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue.

An inert mixed gas such as He + Xe or Ne + Xe for discharging is injected into the discharge space of the discharge cell provided between the upper and lower substrates 10 and 18 and the partition wall 26.

Since the delta type electrode structure has the scan electrode Y and the common sustain electrode Y symmetrically positioned in all pixel cells, unlike the other structures, the metal bus electrodes 13Y and 13Z are transparent electrodes 12Y and 12Z. Since the light is located at the center of the C), the light at the top and the bottom of the discharge cell is blocked by the metal bus electrodes 13Y and 13Z so that black lines are formed in the direction of the electrode, thereby reducing the luminance.

Moreover, in the delta-type partition wall structure, discharge formation is formed in the upward and downward directions, so that the distance between the phosphors of each partition wall from the discharge-formed area is not constant. As a result, all of the light emitted from the phosphor surrounding the flesh surface does not emit light of the same intensity. In addition, the discharge generated in the electrode around the partition wall is a loss due to the diffusion of the charged particles to the partition wall has a disadvantage in that the discharge efficiency is lowered.

Accordingly, an object of the present invention is to provide a plasma display panel having an electrode structure for improving the discharge efficiency.

1 is a cross-sectional view showing a conventional three-electrode alternating current surface-discharge plasma display panel.

2 is a perspective view illustrating a stripe-type partition wall of a conventional plasma display panel.

3 is a perspective view illustrating a well-type partition wall of a conventional plasma display panel.

4 is a perspective view showing a conventional plasma display panel having a delta partition structure.

5 is a plan view showing the electrode arrangement shown in FIG.

6 is a perspective view showing a plasma display panel according to the present invention;

7 to 10 are plan views showing the electrode arrangement according to the embodiment of the present invention shown in FIG.

<Explanation of symbols for main parts of drawing>

10, 40: upper substrate 12Y, 42Y: transparent electrode

13Z, 43Z: metal bus electrodes 14, 22, 44, 50: dielectric layer

16, 36: protective film 18, 48: lower substrate

20: phosphor 24, 26, 46: partition wall

X: address electrode Y: scan electrode

Z: common sustain electrode

In order to achieve the above object, the transparent electrode of the plasma display panel according to the present invention is extended to the center of the cell has a protrusion having a circular or polygonal shape, the protrusion of any one of the first and second sustain electrode Characterized in that formed inside the projection of the other transparent electrode.

The transparent electrode used during the scan and sustain discharge is characterized in that located inside the transparent electrode used only during the sustain discharge.

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. 6 to 10.

6 and 7, the discharge cells of the PDP according to the first embodiment of the present invention are the scan electrode Y, the common sustain electrode Z, and the lower substrate 48 formed on the upper substrate 40. Has an address electrode X formed thereon.

Each of the scan electrode Y and the common sustain electrode Z has a line width smaller than that of the transparent electrodes 42Y and 42Z and the transparent electrodes 42Y and 42Z, and is formed at the center of the transparent electrodes 42Y and 42Z. Metal bus electrodes 43Y and 43Z.

The metal bus electrodes 43Y and 43Z of each of the scan electrode Y and the common sustain electrode Z are formed to be orthogonal to the address electrode X. The transparent electrodes 42Y and 42Z of each of the scan electrode Y and the common sustain electrode Z are separately formed for each discharge cell.

In detail, the transparent electrode 42Y of the scan electrode Y has a predetermined width and extends inside the discharge cell, and is formed in the shape of a circle 51 at the center of the discharge cell. The transparent electrode 42Z of the common sustain electrode Z has a predetermined width and extends into the discharge cell, and is spaced apart from the transparent electrode 42Y of the circular shape 51 of the scan electrode Y by a predetermined distance. The transparent electrode 42Y of the scan electrode Y is enclosed in the form of an open circular band 53.

The transparent electrodes 42Y and 42Z are formed on the upper substrate 40 by using a transparent conductive metal, for example, indium tin oxide (Indium-Tin-Oxide). The metal bus electrodes 43Y and 43Z are made of metal such as chromium (Cr), and are formed on the transparent electrodes 42Y and 42Z to reduce the voltage drop caused by the transparent electrodes 42Y and 42Z having high resistance.

The upper dielectric layer 44 and the passivation layer 36 are stacked on the upper substrate 40 on which the scan electrode Y and the common sustain electrode Z are arranged side by side. The upper dielectric layer 44 accumulates wall charges generated during plasma discharge. The passivation layer 36 prevents damage to the upper dielectric layer 44 by sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 36, magnesium oxide (MgO) is usually used.

The wall charges generated during the plasma discharge are accumulated in the upper dielectric layer 44. The passivation layer 36 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 36, magnesium oxide (MgO) is usually used.

The address electrode X is perpendicular to the scan electrode Y and the common sustain electrode Z. The lower dielectric layer 52 and the partition wall 46 are formed on the lower substrate 48 on which the address electrode X is formed.

The partition wall 46 is formed in parallel with the address electrode X to prevent the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells. The partition wall 46 has a structure in which one cell is surrounded by six surfaces and connected to narrow channels 54. Accordingly, the coating area of the phosphor can be increased to increase the luminance, and the exhaust gas is well vented through the narrow channel 54.

Phosphors are applied to the surfaces of the lower dielectric layer 52 and the partition wall 46. The phosphor is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue.

An inert mixed gas such as He + Xe or Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 40 and 48 and the partition wall 46.

The transparent electrodes 42Y and 42Z of the scan electrode Y and the common sustain electrode Z having the circular 51 shape are formed of one of the two electrodes and the other transparent electrodes 42Y and 42Z. 42Z). For example, the transparent electrode 42Y of the scan electrode Y may be provided inside the transparent electrode 42Z of the common sustain electrode Z, or vice versa. In the case where the transparent electrode 42Y of the scan electrode Y is located therein, since the area intersecting with the address electrode X is large, address discharge can be easily caused.

As a result, the distance that reaches the partition 46 from the discharge space becomes constant. As a result, the intensity of visible light emitted from the phosphors of each partition wall is generated equally. In addition, by separating the discharge space from the partition wall 46, the discharge efficiency is improved by minimizing the disappearance of the charged particles diffused into the partition wall 46 formed during the discharge.

Referring to FIG. 8, in the electrode structure of the PDP according to the second embodiment of the present invention, each of the scan electrode (Y) and the common sustain electrode (Z) is a transparent electrode (42Y, 42Z) and a transparent electrode (42Y, 42Z). And metal bus electrodes 43Y and 43Z having a line width smaller than the line width and formed in the center of the transparent electrodes 42Y and 42Z.

The metal bus electrodes 43Y and 43Z of each of the scan electrode Y and the common sustain electrode Z are formed to be orthogonal to the address electrode X.

The transparent electrodes 42Y and 42Z of each of the scan electrode Y and the common sustain electrode Z are separately formed for each discharge cell. In detail, the transparent electrode 42Y of the scan electrode Y has a predetermined width and extends inside the discharge cell, and is formed as a quadrangle 55 at the center of the discharge cell. The transparent electrode 42Z of the common sustain electrode Z has a predetermined width and extends into the discharge cell, and is spaced apart from the transparent electrode 42Y in the shape of the rectangle 55 of the scan electrode Y by a predetermined distance. The transparent electrode 42Y of the scan electrode Y is enclosed in the form of an open rectangular band 57.

The transparent electrodes 42Y and 42Z are formed on the upper substrate 40 with a transparent conductive metal, for example, indium tin oxide (ITO). The metal bus electrodes 43Y and 43Z are made of metal such as chromium (Cr), and are formed on the transparent electrodes 42Y and 42Z to reduce the voltage drop caused by the transparent electrodes 42Y and 42Z having high resistance.

The transparent electrodes 42Y and 42Z of each of the scan electrodes Y and the common sustain electrodes Z having the quadrangles 55 and 57 form the transparent electrodes 42Y and 42Z among the two electrodes. 42Y, 42Z). For example, the transparent electrode 42Y of the scan electrode Y may be provided inside the transparent electrode 42Z of the common sustain electrode Z, or vice versa. In the case where the transparent electrode 42Y of the scan electrode Y is located therein, since the area intersecting with the address electrode X is large, address discharge can be easily caused.

As a result, the distance that reaches the partition 46 from the discharge space becomes constant. As a result, the intensity of visible light emitted from the phosphors of each partition wall is generated equally. In addition, by separating the discharge space from the partition wall 46, the discharge efficiency is improved by minimizing the disappearance of the charged particles diffused into the partition wall 46 formed during the discharge.

Referring to FIG. 9, in the electrode structure of the PDP according to the third embodiment of the present invention, each of the scan electrode (Y) and the common sustain electrode (Z) is a transparent electrode (42Y, 42Z) and a transparent electrode (42Y, 42Z). And metal bus electrodes 43Y and 43Z having a line width smaller than the line width and formed in the center of the transparent electrodes 42Y and 42Z.

The metal bus electrodes 43Y and 43Z of each of the scan electrode Y and the common sustain electrode Z are formed to be orthogonal to the address electrode X.

The transparent electrodes 42Y and 42Z of each of the scan electrode Y and the common sustain electrode Z are separately formed for each discharge cell. In detail, the transparent electrode 42Y of the scan electrode Y has a predetermined width and extends inside the discharge cell, and is formed in the shape of a hexagon 59 in the center portion of the discharge cell. The transparent electrode 42Z of the common sustain electrode Z has a predetermined width and extends into the discharge cell, and is spaced apart from the transparent electrode 42Y in the hexagonal shape 59 of the scan electrode Y by one side. The transparent electrode 42Y of the scan electrode Y is enclosed in the form of an open hexagonal band 61.

The transparent electrodes 42Y and 42Z are formed on the upper substrate 40 with a transparent conductive metal, for example, indium tin oxide (ITO). The metal bus electrodes 43Y and 43Z are made of metal such as chromium (Cr), and are formed on the transparent electrodes 42Y and 42Z to reduce the voltage drop caused by the transparent electrodes 42Y and 42Z having high resistance.

The transparent electrodes 42Y and 42Z of each of the scan electrodes Y and the common sustain electrodes Z having the hexagonal shape 59 and 61 have the transparent electrodes 42Y and 42Z of one of the two electrodes. 42Y, 42Z). For example, the transparent electrode 42Y of the scan electrode Y may be provided inside the transparent electrode 42Z of the common sustain electrode Z, or vice versa. In the case where the transparent electrode 42Y of the scan electrode Y is located therein, since the area intersecting with the address electrode X is large, address discharge can be easily caused.

Referring to FIG. 10, the electrode structure of the PDP according to the fourth embodiment of the present invention includes the scan electrodes Y and the common sustain electrodes Z, respectively, of the transparent electrodes 42Y and 42Z, and the transparent electrodes 42Y and 42Z. And metal bus electrodes 43Y and 43Z having a line width smaller than the line width and formed in the center of the transparent electrodes 42Y and 42Z.

The metal bus electrodes 43Y and 43Z of each of the scan electrode Y and the common sustain electrode Z are formed to be orthogonal to the address electrode X.

The transparent electrodes 42Y and 42Z of each of the scan electrode Y and the common sustain electrode Z are separately formed for each discharge cell. In detail, the transparent electrode 42Y of the scan electrode Y has a predetermined width and extends inside the discharge cell, and is formed in a circular shape 63 at the center of the discharge cell. The transparent electrode 42Z of the common sustain electrode Z has a predetermined width and extends into the discharge cell, and is spaced apart from the transparent electrode 42Y of the circular shape 63 of the scan electrode Y by a predetermined distance. The transparent electrode 42Y of the scan electrode Y is enclosed in the form of an open hexagonal band 65.

The transparent electrodes 42Y and 42Z are formed on the upper substrate 40 with a transparent conductive metal, for example, indium tin oxide (ITO). The metal bus electrodes 43Y and 43Z are made of metal such as chromium (Cr), and are formed on the transparent electrodes 42Y and 42Z to reduce the voltage drop caused by the transparent electrodes 42Y and 42Z having high resistance.

The transparent electrodes 42Y and 42Z of each of the circular electrode 63 and the common sustain electrode Z of the hexagonal strip 65 form one of the two transparent electrodes 42Y and 42Z. Is installed inside the other transparent electrodes 42Y and 42Z. For example, the transparent electrode 42Y of the scan electrode Y may be provided inside the transparent electrode 42Z of the common sustain electrode Z, or vice versa. In the case where the transparent electrode 42Y of the scan electrode Y is located therein, since the area intersecting with the address electrode X is large, address discharge can be easily caused.

As in the first to fourth embodiments of the present invention, the shapes formed at the centers of the discharge cells in the scan electrodes Y and the common sustain electrodes Z may be formed in shapes other than circular, square, and polygonal shapes. .

As described above, the plasma display panel according to the present invention forms a sustain electrode having any one of a circle, a rectangle, and a hexagon, and installs one electrode inside the other electrode to reach each partition in the discharge space. By keeping the distance constant, the amount of visible light emitted from the phosphors of each partition wall is the same, thereby minimizing the diffusion of charged particles formed during the discharge into the partition wall and improving the discharge efficiency.

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.

Claims (7)

A plasma display panel having a partition wall shape forming a delta cell structure and having first and second sustain electrodes made of a metal bus electrode and a transparent electrode, The transparent electrode extends toward the center of the cell and has a protrusion having a circular or polygonal shape, wherein the protrusion of one of the first and second sustain electrodes is formed inside the protrusion of the other transparent electrode. Plasma display panel. The method of claim 1, A plasma display panel, characterized in that the transparent electrode used for scanning and sustain discharge is located inside the transparent electrode used only for sustain discharge. The method of claim 1, The transparent electrode of the first sustain electrode has a circular center portion in the cell, and the transparent electrode of the second sustain electrode has a circular band shape surrounding the transparent electrode of the first sustain electrode. The method of claim 1, The transparent electrode of the first sustaining electrode has a central portion in the cell having a rectangular shape, and the transparent electrode of the second sustaining electrode has a rectangular band shape surrounding the transparent electrode of the first sustaining electrode. The method of claim 1, The transparent electrode of the first sustain electrode has a central portion in the cell hexagonal, the transparent electrode of the second sustain electrode is a plasma display panel, characterized in that the form of a hexagonal band surrounding the transparent electrode of the first sustain electrode. The method of claim 1, The transparent electrode of the first sustaining electrode has a circular center portion in the cell, and the transparent electrode of the second sustaining electrode has a hexagonal band shape surrounding the transparent electrode of the first sustaining electrode. The method of claim 1, The transparent electrode of the first sustaining electrode has a central portion in the cell polygonal, and the transparent electrode of the second sustaining electrode has a polygonal band shape surrounding the transparent electrode of the first sustaining electrode.