KR100536890B1 - Plasma display panel with for efficient discharge - Google Patents

Abstract

When the line width of the electrode is increased to increase the wall charge forming space, the stability of the discharge is ensured, but the aperture ratio is lowered at that time. That is, it is good to increase both the electrode line widths of the X-holding electrode and the Y-holding electrode, but in this case, the aperture ratio of the discharge cell is significantly reduced. Therefore, the present invention constitutes an asymmetrical electrode line width of the X-holding electrode and the Y-holding electrode in forming a trapezoidal X-holding electrode and a Y-holding electrode without a transparent electrode. The main and branch electrode portions are formed asymmetrically. When the electrode line width of only one of them is increased to form asymmetrically as in the present invention, it is possible to simultaneously satisfy the minimum aperture ratio required for light emission luminance and the minimum electrode line width required for stability of discharge. In addition, when the sustain electrode having a relatively large line width is used for the address discharge with the address electrode, the efficiency of the address discharge can be increased.

Description

Plasma display panel with efficient discharge

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), and more particularly to a PDP for efficient discharge.

The PDP consists of a front panel and a rear panel, and is filled with discharge gas such as Ne and Xe, and the vacuum ultraviolet rays generated through the gas discharge excite the red (R), green (G), and blue (B) phosphors. To display an image while generating visible light.

PDP is divided into direct current (DC) type and alternating current (AC) type. In the direct current type, an electrode used for applying an external voltage to form a plasma is directly exposed to the plasma so that a conduction current is directly transmitted through the electrode. It is a way to make it flow. DC-type PDP has the advantage of relatively simple structure, but has the disadvantage that the electrode is exposed to the discharge space to have an external resistance for limiting the current.

AC-type PDP is a method in which a displacement current flows because the electrode is covered with a dielectric and is not directly exposed. AC type PDP has the advantage that the current can be limited by covering the electrode with a dielectric, which protects the electrode from ion shock during discharge, so it has a long life compared to the DC type.

AC-type PDP is further divided into a counter discharge type and a surface discharge type according to the electrode structure of the discharge cell. The opposite discharge type has a problem of shortening the lifetime of the phosphor due to the phosphor deterioration due to the ion bombardment, while the surface discharge type overcomes the problem of the opposite structure by collecting the discharge to the opposite side of the phosphor to minimize the degradation of the phosphor. Currently, most PDPs use surface discharge.

Figure 1a is a perspective view showing the front panel structure of the three-electrode surface discharge AC PDP, Figure 1b is a perspective view showing the structure of the back panel.

Referring to FIGS. 1A and 1B, the PDP is formed by stacking thin films constituting cells on the front substrate 110 and the rear substrate 102, which are two different glass substrates, and forming a front panel and a rear panel, respectively. To be placed toward the side.

Referring to FIG. 1A, in the front panel displaying an image, a plurality of transparent electrodes 114 are disposed on the front substrate 110, and a bus electrode is disposed on the side end of the adjacent cell on each transparent electrode 114. 112 is disposed. For example, a conductive layer made of a light transmitting material such as indium tin oxide (ITO) is applied to the transparent electrode, and an opaque metal conductive layer such as Cu / Cr / Cu or Ag is applied to the bus electrode.

Two front electrodes of the transparent electrode 114 and the bus electrode 112 are paired in one cell, one of which is called an X-holding electrode and the other of which is called a Y-holding electrode.

The transparent dielectric 116 for limiting the discharge current is covered on the front substrate 110 on which the transparent electrode 114 and the bus electrode 112 are formed. On the transparent dielectric 116, a protective layer 118, such as an MgO layer, for example, for dielectric protection is formed.

Referring to FIG. 1B, a rear panel is formed by aligning a plurality of address electrodes (also referred to as data electrodes) 104 on the rear substrate 102 so as to be orthogonal to the bus electrodes 112 of the front panel.

A white dielectric layer 106 is formed on the back substrate 102 on which the address electrode 104 is formed. The white dielectric layer 106 reflects visible light generated in the discharge space while protecting the address electrode 104. Function.

A stripe-shaped partition wall 108 is formed on the white dielectric layer 106 to secure a discharge space, and visible light is emitted on the upper side of the white dielectric layer 106 and the side surface of the partition wall 108, which are cell bottom surfaces. Phosphors 120a, 12b, and 120c are formed.

The discharge cells are separated by the stripe-shaped partition wall 108, and a red phosphor 120b, a green phosphor 120c, and a blue phosphor 120a are coated on each unit discharge cell.

2 is a plan view showing the front electrode of the front panel together with the partition of the rear panel.

As shown in FIG. 2, the plurality of partitions 108 have a stripe shape formed parallel to each other in one direction, and the plurality of transparent electrodes 114 and the plurality of bus electrodes 112 vertically cross the partition 108. It is arranged in parallel with each other in the direction to. The front electrode composed of the transparent electrode 114 and the bus electrode 112 is formed by pairing two X-holding electrodes and a Y-holding electrode in the unit discharge cell region.

3 is a cross-sectional view showing a structure of a front electrode of a PDP according to another prior art, which is a technique disclosed in Korean Patent Laid-Open Publication No. 2001-0018861.

Referring to Figure 3, the front electrode is composed of only a ladder-shaped metal without a transparent electrode. That is, the X-holding electrode 320 and the Y-holding electrode 330 of each of the unit discharge cells of R, G, and B are each made of only a metal member having a trapezoidal shape without a transparent electrode.

The X-hold electrode 320 includes a terminal electrode part 320a connected to an input terminal part of a driving waveform, and a main electrode part 320b, a terminal electrode part 320a and a main electrode which cause discharge together with the Y-hold electrode. It is composed of a branch electrode portion 320c for connecting the portion (320b). The branch electrode part 320c is positioned at the center of adjacent partition walls 310 of the rear panel.

The Y-hold electrode 330 also includes a terminal electrode part 330a, a main electrode part 330b, and a branch electrode part 330c similarly to the X-hold electrode 320.

In the X-hold electrode 320, the line width of the terminal electrode part 320a is XA, the line width of the main electrode 320b is XB, and the line width of the branch electrode part 320c is XC, and in the Y-hold electrode 330, When the line width of the terminal electrode portion 330a is YA, the line width of the main electrode 330b is YB, and the line width of the branch electrode portion 330c is YC, the line widths XA, XB, XC, YA, YB, and YC are substantially In the case of 42 "panel, the minimum line width required for stability of discharge is 60 micrometers normally.

Meanwhile, when the front electrode having the structure shown in FIG. 3 is applied to the panel, a conductive layer made of a light transmitting material such as ITO (Indium Tin Oxide) is not required, and thus a great effect on the manufacturing process and cost reduction of the panel can be obtained. However, there is a problem in that it is difficult to simultaneously satisfy the minimum aperture ratio required for the desired luminance and the minimum line width required for the stability of the discharge.

That is, the discharge gap between the X-hold electrode 320 and the Y-hold electrode 330 is generally called a discharge gap, and the discharge gap must maintain a required distance for stable discharge, and the electrode must also have a required line width. do. In addition, the larger the line width of the electrode is, in order to induce stable discharge without increasing the driving voltage of the electrode.

However, when the line width of the electrode is increased, since the front electrode is a metal of opaque material, the aperture ratio of the discharge cell is significantly reduced, thereby reducing the light emission luminance.

As a result, when the panel is highly integrated, even if the line width of each of the members 320a, 320b, and 320c required for the trapezoidal sustaining electrode without the transparent electrode is set to the minimum line width, the desired aperture ratio cannot be achieved. .

An object of the present invention is to provide a PDP having a front electrode structure capable of simultaneously satisfying the minimum aperture ratio required for desired luminance and the minimum electrode line width required for stability of discharge.

One characteristic PDP of the present invention for achieving the above object is a front electrode formed of a pair of the first holding electrode and the second holding electrode formed of only a metal of opaque material without a transparent electrode and extending in one direction on the front panel; And an address electrode formed to extend in a direction in which the first holding electrode and the second holding electrode are vertically crossed in the rear panel, wherein the first holding electrode and the second holding electrode are connected to an input terminal portion of a driving waveform, respectively. And a trapezoidal shape including an electrode portion, a main electrode portion causing discharge, a branch electrode portion connecting the terminal electrode portion and the main electrode portion, and each terminal electrode portion of the first holding electrode and the second holding electrode; The branch electrode part is formed to have substantially the same line width, and each of the main electrode parts of the first holding electrode and the second holding electrode is formed to have a different line width and is asymmetric, and the first holding electrode has a main electrode part having a relatively large line width. Or a write discharge is caused by the second sustain electrode and the address transfer.

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Another characteristic PDP of the present invention comprises a front electrode formed of a pair of first holding electrodes and a second holding electrode formed of only an opaque material metal without a transparent electrode and extending in one direction from the front panel; And an address electrode formed to extend in a direction in which the first holding electrode and the second holding electrode are vertically crossed in the rear panel, wherein the first holding electrode and the second holding electrode are connected to an input terminal portion of a driving waveform, respectively. And a trapezoidal shape including an electrode portion, a main electrode portion causing discharge, a branch electrode portion connecting the terminal electrode portion and the main electrode portion, and each terminal electrode portion of the first holding electrode and the second holding electrode; The main electrode portion is formed to have substantially the same line width, and each branch electrode portion of the first holding electrode and the second holding electrode is formed to have a different line width and is asymmetrical, and the first holding electrode has a branch electrode portion having a relatively large line width. Or a write discharge is caused by the second sustain electrode and the address transfer.

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Another characteristic PDP of the present invention comprises a front electrode formed of a pair of first holding electrodes and a second holding electrode formed of only an opaque material metal without a transparent electrode and extending in one direction from the front panel; And an address electrode formed to extend in a direction in which the first holding electrode and the second holding electrode are vertically crossed in the rear panel, wherein the first holding electrode and the second holding electrode are connected to an input terminal portion of a driving waveform, respectively. It has a trapezoidal shape including an electrode portion, a main electrode portion causing discharge, and a branch electrode portion connecting the terminal electrode portion and the main electrode portion, and each terminal electrode portion of the first holding electrode and the second holding electrode is substantially And the main electrode portions of the first holding electrode and the second holding electrode are asymmetrical with different line widths, and the branch electrode portions of the first holding electrode and the second holding electrode are different from each other. The first holding electrode or the second holding electrode having the main electrode portion and the branch electrode portion having a relatively large width, It characterized by comprising a discharge mouth.

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As described above, the present invention constitutes an asymmetrical electrode line width of the X-holding electrode and the Y-holding electrode in forming a trapezoidal X-holding electrode and a Y-holding electrode without a transparent electrode. The main electrode portion and / or the branch electrode portion serving as asymmetry are formed.

When the line width of the electrode is increased to increase the wall charge forming space, the stability of the discharge is ensured, but the aperture ratio is lowered at that time. That is, it is good to increase both the electrode line widths of the X-holding electrode and the Y-holding electrode, but in this case, the aperture ratio of the discharge cell is significantly reduced.

Therefore, when the electrode line width of only one of them is increased to form asymmetrically as in the present invention, the minimum aperture ratio required for light emission luminance and the minimum electrode line width required for stability of discharge can be satisfied at the same time.

In addition, when the X-holding electrode or Y-holding electrode having a relatively large line width main electrode portion and / or branch electrode portion is used for the address discharge with the address electrode, the efficiency of the address discharge can be increased.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may more easily practice the present invention.

4A to 4C are plan views illustrating a structure of a front electrode of a PDP according to various embodiments of the present invention. The barrier rib 410 and the address electrode 440 of the rear panel and the front electrode (X-sustain electrode 420) of the front panel are shown in FIG. , Y-hold electrode 430 is shown together.

4A to 4C, the front electrode is provided as a pair of the X-holding electrode 420 and the Y-holding electrode 430 in the unit discharge cell, and the X-holding electrode 420 and the Y-holding electrode ( The 430 has a trapezoidal shape without a transparent electrode and extends in a direction perpendicular to the partition walls 410 of the rear panel. The gap between the X-hold electrode 420 and the Y-hold electrode 430 becomes a discharge gap Gap.

The X-holding electrode 420 includes a terminal electrode portion 420a connected to an input terminal portion of a driving waveform, a main electrode portion 420b for generating a discharge together with an address electrode of a Y-holding electrode or a rear panel, and a terminal electrode portion. It is composed of a branch electrode portion 420c connecting the 420a and the main electrode portion 420b.

The Y-hold electrode 430 also includes a terminal electrode portion 430a, a main electrode portion 430b, and a branch electrode portion 430c connected to the input terminal portion of the driving waveform.

The branch electrode parts 420c and 430c are formed at the center of adjacent partition walls 410 of the rear panel and partially overlap with the address electrode 440 of the rear panel, which plays an important role in promoting stability of discharge. Because The positional error of the branch electrode parts 420c and 430c may be designed to fall within the range of -50 μm to +50 μm at the central portion of the adjacent partition walls.

Referring to FIG. 4A, the line width of the terminal electrode portion 420a of the X-hold electrode 420 is XA, the line width of the main electrode 420b is XB, and the line width of the branch electrode portion 420c is XC, and Y- When the line width of the terminal electrode portion 430a of the sustain electrode 430 is YA, the line width of the main electrode 430b is YB, and the line width of the branch electrode portion 430c is YC, the line widths XA, XB, XC, YA, XC is substantially the same.

However, the line width YB of the main electrode 430b of the Y-hold electrode 430 is relatively large compared to the line width XB of the main electrode 420b of the X-hold electrode 420.

That is, in the case of 42 ″ panel, if the line widths XA, XB, XC, YA and XC are designed to be substantially 60 mu m, the line width YB is designed to 70 mu m.

Referring to FIG. 4B, the line widths XA, XB, XC, YA, and XB are substantially the same, but the line width YC of the branch electrode 430b of the Y-hold electrode 430 is the branch electrode of the X-hold electrode 420. 420b) is relatively large compared to the line width XC. That is, in the case of 42 ″ panel, if the line widths XA, XB, XC, YA and YC are designed to be substantially 60 mu m, the line width YB is designed to 70 mu m.

Referring to FIG. 4C, the line widths XA, XB, XC, and YA are substantially the same, but the line width YB of the main electrode 430b of the Y-hold electrode 430 is the main electrode 420b of the X-hold electrode 420. The line width YC of the branch electrode 430b of the Y-hold electrode 430 is relatively large compared to the line width XB of the Y-hold electrode 430. That is, in the case of 42 ″ panel, if the line widths XA, XB, XC, and YA are designed to be substantially 60 mu m, the line widths YB and YC are designed to be substantially 70 mu m.

5 shows an example of a method of driving an AC PDP having a front electrode structure according to an embodiment of the present invention, wherein the X-hold electrode line X, the Y-hold electrode line Y, and the address electrode line Z are shown in FIG. It shows the voltage waveform applied.

In the conventional PDP driving method, a time for displaying one image is divided into a plurality of frames, and each frame is divided into a plurality of sub-fields. The frame consists of eight subfields to provide a signal of the display panel.

5 is a voltage waveform diagram applied to each electrode in one subfield. Referring to FIG. 5, one subfield may be divided into an erasing section T1, a writing section T2, and a sustain section T3 in time.

The erase section T1 is a section initialized by applying pulses to the X-hold electrode line X and the Y-hold electrode line Y by erasing charges generated while the PDP displays previous information.

In the writing section T2, a predetermined voltage is applied between the Y-hold electrode line Y and the address electrode line Z with respect to the discharge cell to be lit to cause discharge between the two electrodes. This is called a write discharge, and cations and electrons which are ionized by the write discharge accumulate as wall charges on the dielectric surface of the front panel.

In the present invention, since the Y-hold electrode line Y has a larger electrode width than the X-hold electrode line X, it is used for the write discharge to increase the efficiency of the write discharge.

The sustain section T3 is repeatedly executed by applying an alternating electric field to the X-hold electrode line X and the Y-hold electrode line Y. As described above, discharge repeatedly performed between the X-hold electrode line X and the Y-hold electrode line Y by the application of an alternating electric field is called a sustain discharge, and the ultraviolet rays generated by the sustain discharge excite the phosphor to display visible light. This is, the front panel is radiated to the outside by the rear panel.

According to the present invention, since the line width of the Y-hold electrode line Y is relatively larger than that of the conventional sustain electrode, the wall charge forming space becomes relatively large. Therefore, the discharge is continued without interruption in the sustaining period T3. In other words, the stability of the discharge is increased.

In addition, although the line width of the entire electrode (metal of opaque material) occupies in the discharge cell is increased, it is not a structure that increases both the X and Y electrode line widths, so that the desired minimum aperture ratio is secured while the front surface of the desired minimum line width is secured. Electrode formation is possible.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

Since the front electrode structure of the panel according to the present invention satisfies both the desired minimum aperture ratio and the electrode line width, there is an effect of increasing the emission brightness and the discharge stability of the PDP.

Figure 1a is a perspective view showing the front panel structure of the AC type PDP according to the prior art.

Figure 1b is a perspective view showing the structure of the AC PDP back panel according to the prior art.

Figure 2 is a plan view showing the front electrode of the front panel with the partition of the rear panel in the prior art.

Figure 3 is a plan view showing a front electrode structure according to the improved prior art.

4A to 4C are plan views illustrating front electrode structures according to various embodiments of the present disclosure.

5 is a rectangular waveform diagram applied to each electrode to drive a panel under the front electrode structure of FIGS. 4A to 4C.

*** Explanation of symbols for main parts of drawing ***

410: partition 420: X-holding electrode

430: Y-hold electrode 420a, 430a: terminal electrode portion

420b and 430b: main electrode part 420c and 430c: branch electrode part

Claims (4)

A front electrode formed of a pair of a first holding electrode and a second holding electrode formed of only an opaque material metal without a transparent electrode and extending in one direction from the front panel; And An address electrode formed on the rear panel and extended in a direction in which the first holding electrode and the second holding electrode are vertically crossed; The first holding electrode and the second holding electrode each have a trapezoid including a terminal electrode portion connected to an input terminal portion of a driving waveform, a main electrode portion causing discharge, and a branch electrode portion connecting the terminal electrode portion and the main electrode portion. In shape, The terminal electrode portions and the branch electrode portions of the first holding electrode and the second holding electrode are formed to have substantially the same line widths, and each of the main electrode portions of the first holding electrode and the second holding electrode has a different line width. Asymmetrical, And a discharge discharge is caused by the first holding electrode or the second holding electrode having the main electrode portion having a relatively large line width and the address field. A front electrode formed of a pair of a first holding electrode and a second holding electrode formed of only an opaque material metal without a transparent electrode and extending in one direction from the front panel; And An address electrode formed on the rear panel and extended in a direction in which the first holding electrode and the second holding electrode are vertically crossed; The first holding electrode and the second holding electrode each have a trapezoid including a terminal electrode portion connected to an input terminal portion of a driving waveform, a main electrode portion causing discharge, and a branch electrode portion connecting the terminal electrode portion and the main electrode portion. In shape, Each terminal electrode portion and the main electrode portion of the first holding electrode and the second holding electrode have a substantially same line width, and each branch electrode portion of the first holding electrode and the second holding electrode has a different line width. Asymmetrical, And a write discharge is caused by the first holding electrode or the second holding electrode having the branch electrode portion having a relatively large line width and the address field. A front electrode formed of a pair of a first holding electrode and a second holding electrode formed of only an opaque material metal without a transparent electrode and extending in one direction from the front panel; And An address electrode formed on the rear panel and extended in a direction in which the first holding electrode and the second holding electrode are vertically crossed; The first holding electrode and the second holding electrode each have a trapezoid including a terminal electrode portion connected to an input terminal portion of a driving waveform, a main electrode portion causing discharge, and a branch electrode portion connecting the terminal electrode portion and the main electrode portion. In shape, Each terminal electrode portion of the first holding electrode and the second holding electrode is formed to have substantially the same line width, and each main electrode portion of the first holding electrode and the second holding electrode is formed to have a different line width and is asymmetrical. The branch electrode portions of the first holding electrode and the second holding electrode are asymmetrical with different line widths, And a write discharge is generated by the first holding electrode or the second holding electrode having a relatively large main line portion and a branch electrode portion and the address field. delete