KR100641574B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to increase light emitting efficiency by widening a positive column discharge area. A plasma display panel includes a plurality of discharge cells which are formed with scan and sustain electrodes(210,220) formed on an upper substrate, and address electrodes formed on a lower substrate. A discharge space is formed between the upper substrate and the lower substrate. The address electrodes cross the scan and sustain electrodes. Each of the address electrodes includes a main line(100) penetrating the discharge cells, a pair of extended lines(110a,110b) crossing the main line, and a pair of auxiliary lines(110) extended from the pair of extended lines.

Description

 Plasma display panel {Plasma display panel}

1 is a schematic cross-sectional view of a discharge cell of a conventional three-electrode AC surface discharge type plasma display panel.

2A and 2B are schematic conceptual views illustrating a state in which discharge is generated in a cell of a plasma display panel according to the related art.

3 is a schematic waveform diagram of driving signals applied to scan electrodes and sustain electrodes of a plasma display panel according to the related art.

4 is a conceptual diagram schematically illustrating a state in which discharge is diffused along an address electrode in a plasma display panel according to the related art.

5 is a schematic plan view showing an address electrode of a plasma display panel according to a first embodiment of the present invention;

6 is a conceptual diagram schematically illustrating a state in which discharge is spread along an address electrode in a plasma display panel according to a first embodiment of the present invention;

7 is a schematic plan view showing an address electrode shape of a plasma display panel according to a second exemplary embodiment of the present invention.

8 is a conceptual diagram schematically illustrating a state in which discharge is spread along an address electrode in a plasma display panel according to a second embodiment of the present invention;

9A and 9B are schematic conceptual views illustrating a state in which discharge is generated in a cell of a plasma display panel according to the present invention.

10 is a schematic waveform diagram of driving signals applied to scan electrodes and sustain electrodes of a plasma display panel according to the present invention;

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

100: main line 110: auxiliary line

110a, 110b: Extension line 121a, 122a: Edge

131,132,133: auxiliary extension line 151,152,153,154: Yanggwangju area

170: address electrode 200: discharge cell

210: scan electrode 220: sustain electrode

The present invention relates to a plasma display panel, and more particularly, to increase the electrode area of an address electrode, and to further create a line for moving wall charges participating in the generation of a positive light discharge area, thereby creating a wide distribution light discharge area. The present invention relates to a plasma display panel capable of increasing luminous efficiency.

In general, a plasma display panel (hereinafter referred to as a plasma display panel) is composed of discharge cells capable of independently discharging, and independently discharges discharge cells according to an externally applied electrical signal to implement an image.

In addition, the plasma display panel can significantly reduce the thickness and weight compared to the CRT, and has a merit of securing a wide viewing angle compared to an LCD (Liquid Crystal Display).

In addition, the plasma display panel is a device that displays letters and shapes mainly by using visible light emitted by ultraviolet rays generated from glow discharge to stimulate photoluminescence phosphors.

The plasma display panel has two types, a direct current type and an alternating current type, and the alternating current type has excellent luminance and luminance efficiency as compared with the direct current type.

On the other hand, many studies to improve the efficiency of the AC plasma display panel (AC PDP) has been conducted to date.

In particular, it has long been anticipated that panel efficiency can be improved by generating positive columns by inducing discharges between wide electrode gaps. However, regarding the characteristics of the positive light discharge phenomenon in micro cells such as plasma display panels, Is not yet clear.

In addition, in order to obtain such a positive pole discharge, the electrode spacing should be wide. However, when such a wide electrode spacing is used, the problem of increasing the discharge start voltage and the discharge sustaining voltage has not been solved. There were many problems with the panel.

1 is a cross-sectional view of a discharge cell of a typical three-electrode alternating surface discharge plasma display panel, wherein the discharge cell of the three-electrode alternating surface discharge plasma display panel has an address electrode 11 formed on the lower substrate 10; The lower dielectric layer 12 is formed on the lower substrate 10 to surround the address electrode 11.

The upper substrate 20 is spaced apart from the lower substrate 10 at a predetermined interval.

Based on the drawing of FIG. 1, the above-described upper substrate 20 has scan electrodes 21 and sustain electrodes 22 spaced apart from each other; Bus electrodes 23a and 23b are formed below each of the scanning electrode 21 and the sustain electrode 22; An upper dielectric layer 24 is formed below the upper substrate 20 to surround the scan electrode 21, the sustain electrode 22, and the bus electrodes 23a and 23b; An MgO film 25 is formed under the upper dielectric film 24.

Here, the address electrode 12 is formed in a direction crossing the scan electrode 21 and the sustain electrode 22.

In addition, the scan electrode 21 and the sustain electrode 22 are typically formed of a transparent electrode such as indium tin oxide (hereinafter, referred to as “ITO”), and the bus electrodes 23a and 23b. A metal such as silver chromium (Cr) is formed on the transparent electrode to reduce the voltage drop caused by the transparent electrode having high resistance.

In addition, the upper dielectric film 24 and the MgO film 25 as a protective film accumulate wall charges generated during plasma discharge, and the MgO film 25 is formed by sputtering generated during plasma discharge. It prevents damage and increases the emission efficiency of secondary electrons.

Meanwhile, a lower dielectric layer 12 and a partition wall (not shown) are formed on the lower substrate 10 on which the address electrode 12 is formed, and a phosphor layer is coated on the lower dielectric layer 12 and the partition wall surface.

The barrier rib is formed in parallel with the address electrode 12 to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells.

The phosphor layer 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, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space of the discharge cells existing between the upper and lower substrates 10 and 20 and the partition walls of the panel.

2A and 2B are schematic conceptual views illustrating a state in which a discharge is generated in a cell of a plasma display panel according to the related art. The discharge description is a distance d between the scan electrode 21 and the sustain electrode 22. In a discharge having a long gap structure, first, when voltage is applied to the address electrode 11 and the sustain electrode 22 at OV and the scan electrode 21 at +180 V, the scan with the address electrode 11 is performed. Due to the voltage difference, a negative glow discharge region 50 is formed between the electrodes 21 as a result of discharge (Fig. 2A).

Thereafter, as shown in FIG. 2B, when voltage is applied to the scan electrode 21 at 0 V and the sustain electrode 22 at +180 V, a discharge is generated between the address electrode 11 and the sustain electrode 22. At this time, as the positive ions generated in the discharge of FIG. 2A move along the address electrode 11 to the sustain electrode 22, small positive column regions 51 and 52 are formed in the address electrode 11. And the sustain electrode 22 are diffused. As a result, a positive light column region 53 exists between the address electrode 11 and the sustain electrode 22 due to this discharge.

On the other hand, in the discharge region, the negative glow discharge region is a region where potential energy is almost exhausted, and the positive column region is a region having a lot of potential energy.

That is, the amount of light emitting region emits ultraviolet rays more than the negative groove discharge region, and from the viewpoint of display, the light emitting efficiency increases as the amount of light receiving region is wider.

In the above-described conventional technique, as shown in FIG. 2A, the electric field for discharge is formed in the direction from the address electrode 11 to the scan electrode 21 (arrow direction in FIG. 2A), so that the scan electrode 21 ), The electrons can be damaged by attack.

The carriers (wall charges) for diffusing the positive column region along the address electrode 11 are + ions, and the positive ions have a low mobility and thus a small amount of movement in the direction of the sustain electrode. There was a problem that the area distribution is reduced and the luminous efficiency is lowered.

3 is a schematic waveform diagram of a driving signal applied to a scan electrode and a sustain electrode of a plasma display panel according to the related art, and a driving signal A applied to the scan electrode and a drive signal B applied to the sustain electrode are shown in FIG. Has a waveform driven alternately.

That is, a voltage that can be driven alternately is applied to the scan electrode and the sustain electrode. At this time, the voltage that can be driven is a voltage (a2, b2) higher than the reference voltage (a1, b1), and is usually a positive voltage. .

Therefore, since the conventional positive voltage is alternately applied to the scan electrode and the sustain electrode, as shown in FIG. 2B, the low-mobility + ions move the wall charge so that only a small amount of + ions are used to generate the positive light region. Participating in the present invention has a problem in that the actual amount of the distilled liquor range is reduced and the luminous efficiency is lowered.

FIG. 4 is a conceptual diagram schematically illustrating a state in which discharge is spread along an address electrode in a plasma display panel according to the related art. In the discharge cell, the address electrode 11 includes the scan electrode 21 and the sustain electrode 22. Arranged while crossing.

Here, the wall charges accumulated due to the opposite discharge between the scan electrode 21 and the address electrode 11 are moved along the address electrode 11 toward the sustain electrode 22, so that the positive column regions 55a, 55b, 55c are moved. ) Gradually expands.

At this time, when a driving voltage is applied to the sustain electrode 22, a wider positive beam discharge region 55d is formed between the address electrode 11 and the sustain electrode 22. As shown in FIG.

On the other hand, since the distribution area is reduced and enlarged according to the amount of wall charges moved along the address electrode 11, the amount of wall charges moved when the area of the address electrode 11 is narrow is reduced.

Therefore, as shown in Fig. 4, the conventional address electrode 11 is composed of a single line crossing the scan electrode 21 and the sustain electrode 22, so that the wall charge path can move. There is a problem that the area of the address electrode 11 is small, and consequently, the positive light discharge area distribution region is narrow, so that the luminous efficiency is lowered.

In order to solve the problems described above, the present invention increases the area of the address electrode, and additionally creates a line for moving wall charges participating in the generation of the positive discharge region, thereby generating a wide distribution of the positive discharge region. An object of the present invention is to provide a plasma display panel capable of increasing efficiency.

Another object of the present invention is to apply a negative voltage to the scan electrode and the sustain electrode to accumulate electrons having high mobility in the direction of the address electrode, and to participate in the production of the positive electrode discharge region by the electrons, thereby increasing the luminous efficiency. It is to provide a plasma display panel that can be.

A preferred aspect for achieving the above objects of the present invention,

A plurality of discharge cells including a scan electrode and a sustain electrode formed on the upper substrate spaced apart from each other, and an address electrode formed on the lower substrate spaced apart from the upper substrate with a discharge space therebetween and formed to intersect the scan and sustain electrodes. In the plasma display panel,

The address electrode,

A main line passing through the plurality of discharge cells;

A pair of extension lines intersecting the main line and present in spaced positions;

A plasma display panel is provided which includes a pair of auxiliary lines respectively extending to a pair of extension lines in regions spaced apart from both sides of the main line.

Another preferred aspect for achieving the above object of the present invention,

A plurality of discharge cells including a scan electrode and a sustain electrode formed on the upper substrate spaced apart from each other, and an address electrode formed on the lower substrate spaced apart from the upper substrate with a discharge space therebetween and formed to intersect the scan and sustain electrodes. In the plasma display panel,

The address electrode,

A main line passing through the plurality of discharge cells;

A pair of extension lines intersecting the main line and present in spaced positions;

A plasma display panel is provided that includes a plurality of auxiliary extension lines that are present between the pair of extension lines and intersect the main lines and are spaced apart from each other.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a schematic plan view illustrating an address electrode of a plasma display panel according to a first embodiment of the present invention, wherein the address electrode includes a main line 100 passing through a plurality of discharge cells 200; A pair of extension lines (110a, 110b) intersecting the main line (100) and present at a position spaced apart from each other; In the region spaced apart from both sides of the main line 100, a pair of auxiliary lines 110 extending to the pair of extension lines 110a and 110b, respectively.

Here, the main line 100 passes through the respective discharge cells in a straight line as shown by the line A-B of FIG.

The discharge cells may be formed on the scan electrode and the sustain electrode formed on the upper substrate spaced apart from each other, and the address electrode formed on the lower substrate spaced apart from the upper substrate with a discharge space therebetween, and formed to intersect the scan and sustain electrodes. Refers to what is made. See FIG. 1 for a specific example of this discharge cell.

In addition, the pair of auxiliary lines 110 may be parallel to the main line 100.

The auxiliary line 110 serves as a line for moving wall charges participating in the positive light discharge area generation, and the auxiliary lines 110 must be parallel to the main line 100 to speed up the transmission of the address signal. It is possible to reduce the distance of wall charges participating in the generation of the positive light discharge area.

In addition, the pair of extension lines 110a and 110b may be disposed at positions opposite to the scan electrodes 210 and the sustain electrodes 220 of the plasma display panel.

In addition, the width W1 from one edge of the extension line 110a of the pair of extension lines 110a and 110b to the edge 122a of the other extension line 110b is the width of the discharge cell. It is preferable that it is smaller than (W2).

Therefore, the address electrode of the plasma display panel according to the first embodiment of the present invention has a wide distribution of the positive electrode column area by increasing the electrode area and plural lines for moving the wall charges participating in the generation of the positive electrode line area. This can be generated to increase the luminous efficiency.

FIG. 6 is a conceptual diagram schematically illustrating a state in which a discharge is spread along an address electrode in a plasma display panel according to a first embodiment of the present invention, and accumulates as a counter discharge between a scan electrode 210 and an address electrode in a discharge cell. As the wall charges move toward the sustain electrode 220 along the main line 100 and the auxiliary lines 121 and 122 of the address electrode, the positive light main regions 151, 152 and 153 gradually expand, driving the sustain electrode 220. When a voltage is applied, a wider positive column region 154 is formed between the address electrode and the sustain electrode 220.

Therefore, in the present invention, the address electrode is formed to have a large area and to have a plurality of lines for movement, so that the amount of wall charges is increased, thereby ensuring a wide light-emitting discharge region.

FIG. 7 is a schematic plan view illustrating an address electrode shape of a plasma display panel according to a second embodiment of the present invention. The address electrode according to the second embodiment of the present invention includes a main line passing through a plurality of discharge cells 200. 100); A pair of extension lines (110a, 110b) intersecting the main line (100) and present at a position spaced apart from each other; The pair of extension lines 110a and 110b exist between the pair of extension lines 110a and 110b and intersect the main line 100 and are spaced apart from each other.

As in the first embodiment described above, the main line 100 passes through the respective discharge cells in a straight line as shown by the C-D line of FIG.

In addition, the plurality of auxiliary extension lines 131, 132, and 133 may be parallel to the extension lines 110a and 110b.

In FIG. 7, three auxiliary extension lines are formed, which is for explaining the second embodiment of the present invention, and forms at least two or more auxiliary extension lines.

The plurality of auxiliary extension lines 131, 132, and 133 serve as a line for moving wall charges participating in the generation of the positive pole discharge area, and help the positive pole discharge area to diffuse toward the sustain electrode.

Therefore, the address electrode of the plasma display panel according to the second embodiment of the present invention also has a larger electrode area than that of the conventional address electrode, and is provided with a line for moving wall charges participating in the production of the positive light discharge area. It is possible to form a positive light discharge area distribution can increase the luminous efficiency.

FIG. 8 is a conceptual diagram schematically illustrating a state in which a discharge is diffused along an address electrode in a plasma display panel according to a second embodiment of the present invention, and is opposed to a scan electrode 210 and an address electrode 220 in a discharge cell. As the wall charges accumulated by the discharge move in the direction of the sustain electrode 220 along the main line 100 and the auxiliary extension lines 131, 132, and 133 of the address electrode, the positive pole regions 151, 152, 153 gradually expand, and the sustain electrode ( When a driving voltage is applied to the 220, a wider positive column region 154 is formed between the address electrode and the sustain electrode 220.

Therefore, the address electrode according to the second embodiment of the present invention also has a large electrode area and forms an address electrode having a plurality of lines for movement, thereby increasing the amount of wall charges, thereby securing a wide positive light discharge region. Will be.

As shown in FIGS. 5 and 7, the address electrodes according to the first and second embodiments of the present invention have a long gap structure in which a distance d1 between the scan electrode and the sustain electrode is 150 to 350 μm. It is preferable that it is an address electrode which satisfies.

9A and 9B are schematic conceptual views illustrating a state in which a discharge occurs in a cell of a plasma display panel according to the present invention. In the present invention, the address electrode 170 and the sustain electrode 220 are OV, and the scan electrode 210 is illustrated in FIG. Is applied at a voltage of −180 V, a discharge occurs due to a voltage difference between the address electrode 170 and the scan electrode 210 (FIG. 9A).

At this time, the electric field direction for discharge is formed from the scan electrode 210 to the address electrode 170, so that + ions accumulate toward the scan electrode 210 and electrons accumulate toward the address electrode 170. do.

Thereafter, when a voltage of 0 V is applied to the scan electrode 210 and -180 V to the sustain electrode 220, a discharge occurs between the address electrode 170 and the sustain electrode 220, and electrons accumulated in the discharge of FIG. 9A are generated. As the positive electrode moves along the address electrode 170 to the sustain electrode 220, small positive column regions 151 and 152 are diffused between the address electrode 170 and the sustain electrode 220. Between the 170 and the sustain electrode 220, a wide positive column region 153 due to the discharge is formed.

Here, the reason why the wide positive columnar region 153 is formed is that electrons accumulated in the direction of the address electrode 170 in the discharge of FIG. 9A are moved toward the sustain electrode 220 to participate in the formation of the positive columnar region 153. In the related art, cations having low mobility are moved, but in the present invention, electrons having a higher mobility are moved than cations, so that a large amount of electrons is generated in the photonic region 153. Participate in the creation to get a wide Yangshuo region.

FIG. 10 is a schematic waveform diagram of driving signals applied to scan electrodes and sustain electrodes of a plasma display panel according to an exemplary embodiment of the present invention, wherein driving signals M applied to scan electrodes and driving signals N applied to sustain electrodes are shown in FIG. The driving voltage having an alternating driving waveform and capable of alternately driving the scan electrode and the sustain electrode is a voltage (m2, n2) lower than the reference voltages (m1, n1), and the reference voltage is OV, and driving The voltage is negative.

Here, the voltage applied to the scan electrode and the sustain electrode for discharge is lower than the address voltage.

The difference between the voltage applied to the scan electrode and the sustain electrode and the address voltage is preferably larger than 150V and smaller than 300V.

That is, the negative voltage is -150V to -300V.

Therefore, in the present invention, electrons can accumulate in the direction of the address electrode and participate in the generation of the positive light main region during discharge diffusion, thereby enhancing the luminous efficiency.

As described above, the present invention increases the electrode area of the address electrode, and additionally creates a line for moving wall charges participating in the generation of the positive electrode discharge region, thereby generating a wide distribution of the positive electrode discharge region, thereby increasing luminous efficiency. It can be effected.

In addition, according to the present invention, by applying a negative voltage to the scan electrode and the sustain electrode, electrons with high mobility are accumulated in the direction of the address electrode, and the electrons participate in the generation of the positive light source discharge region, thereby increasing the luminous efficiency. It has an effect.

Although the invention has been described in detail only with respect to specific examples, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (15)

A plurality of discharge cells including a scan electrode and a sustain electrode formed on the upper substrate spaced apart from each other, and an address electrode formed on the lower substrate spaced apart from the upper substrate with a discharge space therebetween and formed to intersect the scan and sustain electrodes. In the plasma display panel, The address electrode, A main line passing through the plurality of discharge cells; A pair of extension lines intersecting the main line and present in spaced positions; And a pair of auxiliary lines respectively extending to a pair of extension lines in regions spaced apart from both sides of the main line. The method of claim 1, The pair of extension lines, And a plasma display panel at a position opposite to the scan electrode and the sustain electrode of the plasma display panel. The method of claim 1, The width W1 from one extension line edge to another edge of the pair of extension lines is A plasma display panel, characterized in that smaller than the width (W2) of the discharge cell. The method according to any one of claims 1 to 3, The pair of auxiliary lines, And a plasma display panel parallel to the main line. The method according to any one of claims 1 to 3, The distance d1 between the scan electrode and the sustain electrode is Plasma display panel, characterized in that 150 ~ 350㎛. The method of claim 1, So that a discharge occurs between the address electrode and the scan electrode, The same voltage is applied to the address electrode and the sustain electrode, And a negative voltage is applied to the scan electrode as a discharge driving voltage. The method of claim 6, After the discharge occurs between the address electrode and the scan electrode, Discharge occurs between the address electrode and the sustain electrode; The same voltage is applied to the address electrode and the scan electrode, And the sustain electrode is supplied with a negative voltage as the discharge driving voltage. The method according to claim 6 or 7, The same voltage is 0V, and the negative voltage is -150V to -300V. A plurality of discharge cells comprising a scan electrode and a sustain electrode formed on the upper substrate spaced apart from each other, and an address electrode formed on the lower substrate spaced apart from the upper substrate with a discharge space therebetween and formed to intersect the scan and sustain electrodes. In the formed plasma display panel, The address electrode, A main line passing through the plurality of discharge cells; A pair of extension lines intersecting the main line and present in spaced positions; And a plurality of auxiliary extension lines interposed between the pair of extension lines and intersecting the main lines and spaced apart from each other. The method of claim 9, The pair of extension lines, And a plasma display panel at a position opposite to the scan electrode and the sustain electrode of the plasma display panel. The method according to claim 9 or 10, The distance d1 between the scan electrode and the sustain electrode is Plasma display panel, characterized in that 150 ~ 350㎛. The method according to claim 9 or 10, The plurality of auxiliary extension lines, And a plasma display panel parallel to the extension lines. The method of claim 9, A reference voltage is applied to the address electrode, A driving voltage is alternately applied to the scan electrode and the sustain electrode, And the driving voltage is lower than a reference voltage. The method of claim 13, The difference between the drive voltage and the reference voltage is, A plasma display panel, characterized in that greater than 150V and smaller than 300V. The method according to claim 13 or 14, The reference voltage is, OV. The plasma display panel.

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