KR20040055302A - Electrode for Plasma Display Panel - Google Patents

Abstract

PURPOSE: An electrode structure is provided to achieve improved discharge efficiency and luminance and reduce a power consumption by improving the structure of a transparent electrode. CONSTITUTION: A plasma display panel comprises a common sustain electrode(Z) and a scan sustain electrode(Y) formed on a front substrate. The common sustain electrode includes a transparent electrode(Za) made of a transparent indium-tin-oxide(ITO) material, and a bus electrode(Zb) made of a metal material. The scan sustain electrode includes a transparent electrode(Ya) made of a transparent ITO material, and a bus electrode(Yb) made of a metal material. The transparent electrode of the common sustain electrode has a width gradually decreasing as it goes toward the bus electrode of the scan sustain electrode, such that the transparent electrode has a triangular shape having an apex formed by the nearest point from the bus electrode of the scan sustain electrode. The transparent electrode of the scan sustain electrode is staggered with the transparent electrode of the common sustain electrode, such that the transparent electrode has a triangular shape having an apex formed by the nearest point from the bus electrode of the common sustain electrode.

Description

Electrode Structure of Plasma Display Panel {Electrode for Plasma Display Panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to an electrode structure of a plasma display panel in which a structure of a transparent electrode is modified to increase discharge efficiency and increase luminance.

Plasma Display Panels (PDPs) are display devices that generate visible light from a phosphor when vacuum ultraviolet rays generated by gas discharge excite the phosphor.

Plasma display panels (PDPs) are in the spotlight in the light of being thinner and lighter than the cathode ray tube (CRT), which has been mainly used as a display device, and capable of realizing a high-definition large screen.

The plasma display panel is composed of a plurality of discharge cells arranged in a matrix form, one discharge cell forms a pixel, the discharge cells gather to form the entire screen.

In general, a plasma display panel is divided into a direct current type and an alternating current type, among which an AC plasma display panel is currently mainstream.

1 is a view for explaining the structure of a conventional three-electrode AC surface discharge type plasma display panel.

Referring to FIG. 1, a plasma display panel includes a front substrate 10 on which an image is displayed, and a rear substrate 20 formed spaced apart from the front substrate 10 at a predetermined interval by a frit glass. Is sealed.

The front substrate 10 includes a common holding electrode Z, a scan holding electrode Y, and the common holding electrode Z and a scan holding electrode which are arranged in pairs to maintain light emission of cells by mutual discharge. A dielectric layer 12 for limiting the discharge current of (Y) and allowing each electrode to be insulated, and a protective layer 13 for preventing damage to the dielectric layer 12 and increasing the efficiency of secondary discharge are formed.

The back substrate 20 includes a plurality of address electrodes X for generating vacuum ultraviolet rays by performing address discharge at a portion crossing the common holding electrode Z and the scan holding electrode Y, and the plurality of address electrodes. A dielectric layer 22 to insulate (X), a partition wall 21 formed at one side of the dielectric layer 22 and arranged in parallel to form a plurality of discharge spaces, ie, cells, and the partition wall 21. The fluorescent layer 23 of each of R, G, and B is formed on the side surface of the side wall and between the partition wall 21 and the partition wall 21 to emit visible light.

In addition, the common holding electrode Z is formed between a transparent electrode (ITO electrode) Za, a bus electrode Zb made of a metal material, and is formed between the transparent electrode Za and the bus electrode Zb. In order to improve contrast as a conductive material, a black layer (B) made of ruthenium oxide and lead oxide or carbon series is formed.

In addition, the scan holding electrode Y is formed between a transparent electrode (ITO electrode) Ya, a bus electrode Yb made of a metal material, and is formed between the transparent electrode Ya and the bus electrode Yb. In order to improve contrast as a conductive material, a black layer (B) made of ruthenium oxide and lead oxide or carbon series is formed.

In addition, the discharge gas is filled between the front substrate 10 and the rear substrate 20 at a pressure of 300 ~ 400 Torr, the discharge gas is mainly based on He, Ne, Ar, or a mixture thereof as a penning mixture gas. A small amount of Xe gas is used as a source of vacuum ultraviolet light that forms a gas and emits the fluorescent layer 23.

Based on the above configuration, the operation of the conventional plasma display panel will be described.

2 is a view for explaining the operation of the conventional plasma display panel.

For reference, FIG. 2 is a view illustrating the rear substrate 20 rotated 90 degrees with respect to the front substrate 10 for convenience of description.

Referring to FIG. 2, the plasma display panel displays an image by an address display separator in which data writing periods and display periods are divided in time.

First, when a voltage of 150 V to 300 V is supplied between the scan sustain electrode Y and the address electrode X in an arbitrary discharge cell, lighting is performed inside the cell located between the scan sustain electrode Y and the address electrode X. (Writing) A discharge occurs so that wall charges are formed on the inner surface of the discharge space and remain as wall charges on the dielectric layer 12.

In the cells selected by the address discharge, sustain discharge is caused by an AC signal supplied to the common sustain electrode Z and the scan sustain electrode Y, and an electric field is generated in the cell by the discharge, whereby trace electrons in the discharge gas are generated. Accelerates.

Neutral particles in the accelerated electrons and gas collide with each other and are ionized to electrons and ions.Neutral particles are gradually ionized to electrons and ions due to another collision between the ionized electrons and the neutral particles, and the discharge gas is in a plasma state. At the same time, vacuum ultraviolet rays are generated.

The ultraviolet rays generated as described above excite the R, G, and B fluorescent layers 23 to generate visible light, and the visible light is emitted to the outside through the front substrate 10 to emit light of an arbitrary cell from outside. The image can be recognized.

In such a plasma display panel, one frame is composed of a plurality of subfields, and gradation is realized by a combination of subfields.

For example, when 256 gray levels are to be realized, one frame period is time-divided into eight subfields, and each of the eight subfields is divided into a reset period, an address period, and a sustain period.

The full screen is initialized in the reset period, cells in which data is to be displayed are selected by the writing discharge in the address period, and discharge of the selected cells is maintained in the sustain period.

Here, the reset period and the address period of each subfield are the same for each subfield, while the sustain period is increased at a rate of 2n (n = 0,1,2,3,4,5,6,7) in each subfield. .

In this way, since the sustain period is different in each subfield, the luminance and chromaticity of the display image are determined according to the combination of the subfields.

3 is a view for explaining the electrode structure of a conventional plasma display panel.

Referring to FIG. 3, the common holding electrode Z is made of a transparent electrode (ITO electrode) Za formed of a transparent ITO material (Indium-Tin-Oxide) and a metal material (Ag or Cr-Cu-Cr). The bus electrode Zb is included, and the scan sustain electrode Y includes a transparent electrode (ITO electrode) Ya formed of a transparent ITO material, and a bus electrode Yb made of a metal material.

Each transparent electrode Za (Ya) is formed by depositing on the front substrate 10 with an electrode width of about 300 mu m to prevent a decrease in the aperture ratio, and each bus electrode Zb (Yb) is formed of silver ( Ag and chromium (Cr) -copper (Cu) -chromium (Cr) are deposited on the front substrate in a three-layer structure.

Each of the bus electrodes Zb and Yb receives a driving signal from the outside and supplies the supplied driving signal to each of the transparent electrodes Za and Ya so that a uniform voltage is applied to each of the discharge cells.

As described above, the voltage supplied from each of the bus electrodes Zb and Yb is supplied to and discharged from each of the transparent electrodes Za and Ya. The conventional transparent electrodes Za and Ya are transparent electrodes Za. ) And the gap between the bus electrode (Yb) and the transparent electrode (Ya) and the bus electrode (Zb) are wide, causing a lot of power loss due to resistance.

In addition, since the interval between the transparent electrode Za and the bus electrode Yb, and the interval between the transparent electrode Ya and the bus electrode Zb are constant, initial discharge occurs at all points, which causes a problem of lowering the efficiency of the initial discharge.

The present invention has been made in view of the above-described problems, and has an object of reducing the power loss due to resistance by changing the shape of the transparent electrode and improving the efficiency of initial discharge.

1 is a view for explaining the structure of a conventional three-electrode alternating surface discharge plasma display panel.

2 is a view for explaining the operation of the conventional plasma display panel.

3 is a view for explaining an electrode structure of a conventional plasma display panel.

4 is a view for explaining the electrode structure of the plasma display panel according to the present invention.

5 is another embodiment of the electrode structure of the plasma display panel according to the present invention;

<Explanation of symbols for main parts of drawing>

10; Front substrate 12; Dielectric layer

13; Protective layer 20; Backplane

21; Bulkhead 22; Dielectric layer

23; Fluorescent layer B; Black layer

X; Address electrode Y; Scan Holding Electrode

Ya; Transparent electrode Yb; Bus electrode

Z; Common holding electrode Za; Transparent electrode

Zb; Bus electrode

The present invention provides an electrode structure of a plasma display panel having a transparent electrode, a bus electrode, a common holding electrode including a black layer, and a scan holding electrode, wherein the transparent electrode of the common holding electrode is closer to the bus electrode of the scan holding electrode. The width is narrowed to form a triangular shape that is closest to the bus electrode of the scan holding electrode to form a peak, the transparent electrode of the scan holding electrode is formed to cross the transparent electrode of the common holding electrode and the The point closest to the bus electrode is characterized in that formed in a triangular shape forming a vertex.

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

4 is a view for explaining the electrode structure of the plasma display panel according to the present invention.

Referring to FIG. 4, the common sustain electrode Z and the scan sustain electrode Y of the plasma display panel are formed on the front substrate, and are disposed above the rear substrate on which the cells divided by the partition wall 21 are formed.

The common holding electrode Z is a transparent electrode (ITO electrode) formed of a transparent ITO material (Indium-Tin-Oxide) (Za) and a bus electrode (Zb) made of a metal material (Ag or Cr-Cu-Cr). The scan holding electrode Y includes a transparent electrode (ITO electrode) Ya formed of a transparent ITO material, and a bus electrode Yb made of a metal material.

In addition, a black layer made of a conductive material may be formed between the transparent electrode Za and the bus electrode Zb and between the transparent electrode Ya and the bus electrode Yb to improve contrast.

In addition, the width of the transparent electrode Za of the common sustain electrode Z becomes narrower as it is closer to the bus electrode Yb of the scan sustain electrode Y, so that the bus electrode Yb of the scan sustain electrode Y has a smaller width. The nearest point is formed into a triangular shape that forms a vertex.

In addition, the transparent electrode Ya of the scan sustain electrode Y is formed to cross the transparent electrode Za of the common sustain electrode Z and is closest to the bus electrode Zb of the common sustain electrode Z. The point is formed into a triangular shape that forms a vertex.

The transparent electrode Za of the common holding electrode Z and the transparent electrode Ya of the scan holding electrode Y are formed in a triangular shape so as to cross each other so that the gap between the transparent electrode Za and the bus electrode Yb is transparent. The gap between the electrode Ya and the bus electrode Zb is narrowed, and the area where the transparent electrode Za and the transparent electrode Ya contact is widened.

In addition, a portion of the common sustaining electrode Z and the scan sustaining electrode Y that forms the vertex of each of the transparent electrodes Za and Ya may be formed above the partition wall 21.

By forming a portion of each transparent electrode Za (Ya) that forms the vertex on the upper side of the partition wall 21, the area where the transparent electrode Za and the transparent electrode Ya are in contact with each other is maximized.

In addition, each of the bus electrodes Zb and Yb receives a driving signal from the outside, and supplies the supplied driving signal to each of the transparent electrodes Za and Ya so that a uniform voltage is applied to each of the discharge cells. .

The operation of the electrode structure of the plasma display panel according to the present invention will be described based on the above configuration.

When a sustain voltage is applied to the bus electrode Zb of the common sustain electrode Z and the bus electrode Yb of the scan sustain electrode Y, the transparent electrode Za and the scan of the common sustain electrode Z are scanned. The transparent electrode of the scan sustain electrode Y corresponding to the portion where the bus electrode Yb of the sustain electrode Y forms the closest vertex, that is, the corner portion of the transparent electrode Za of the common sustain electrode Z, is formed. At (Ya), the first discharge occurs.

At the same time, the transparent electrode Ya of the scan sustain electrode Y and the bus electrode Zb of the common sustain electrode Z form the closest vertices, that is, the vertex of the transparent electrode Ya of the scan sustain electrode Y. Discharge also occurs in the transparent electrode Za of the common holding electrode Z corresponding to the corner portion forming the edge.

Subsequently, as the sustain voltage is applied, the discharge is expanded to all the portions in which the transparent electrode Za and the transparent electrode Ya are in contact with each other, and eventually diffuse into the entire cell.

As described above, the electrode structure of the plasma display panel according to the present invention shortens the power loss due to the resistance of the transparent electrodes Za and Ya by shortening the length of the transparent electrodes Za and Ya on one side during initial discharge. It is possible to increase the discharge efficiency by allowing the initial discharge to occur quickly.

5 is another embodiment of the electrode structure of the plasma display panel according to the present invention.

5 has the same basic technical concept as the embodiment of FIG. 4, but forms a vertex of the transparent electrodes Za and Ya formed on the common holding electrode Z and the scan holding electrode Y. Is formed at two or more points in one cell.

By forming two or more points at the top of the transparent electrodes Za and Ya in one cell, power loss due to resistance during initial discharge is reduced, and luminance increases as the discharge area is widened.

The electrode structure of the plasma display panel according to the present invention has the advantage that the power loss due to the resistance is reduced by changing the shape of the transparent electrode, and the initial discharge occurs quickly, thereby improving the efficiency of the initial discharge.

In addition, the present invention has the advantage that the discharge efficiency is improved because the area where the discharge is increased.

In addition, the present invention has the advantage that the brightness is increased as the discharge efficiency is increased.

Claims (3)

In the electrode structure of the plasma display panel having a transparent electrode, a bus electrode, a common holding electrode including a black layer, and a scan holding electrode, The transparent electrode of the common sustaining electrode has a narrower width as it is closer to the bus electrode of the scan sustaining electrode, and is formed in a triangular shape where a point closest to the bus electrode of the scan sustaining electrode forms a vertex. And the transparent electrode of the scan sustain electrode is formed to cross the transparent electrode of the common sustain electrode and has a triangular shape with a point closest to the bus electrode of the common sustain electrode. The method of claim 1, The electrode structure of the plasma display panel, characterized in that the portion forming the apex of the transparent electrode formed on the common holding electrode and the scan holding electrode formed on the upper side of the partition wall. The method of claim 1, The electrode structure of the plasma display panel, characterized in that the portion forming the vertex of the transparent electrode formed on the common holding electrode and the scan holding electrode is formed at least two points in one cell.