KR100683804B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to increase light emitting efficiency and to reduce an address discharging voltage and an address discharging delay by generating a long gap discharge between first discharging electrodes and second discharging electrodes. A first substrate and a second substrate are oppositely arranged to be separated. A first barrier rib(281) is arranged between the first substrate and the second substrate and divides into plural discharging cells(230). First discharging electrodes(260) and second discharging electrodes(270) are oppositely arranged toward the insides of the discharging cells in the first barrier rib. Address electrodes(290) are separately arranged on the first substrate or the second substrate. The address electrodes cross the first and second discharging electrodes. The respective address electrodes have bus units(291) and discharging units(292). The discharging unit is electrically connected to the bus unit. Plural projections are formed on a circumference of the discharging unit.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view of a plasma display panel having a general three-electrode surface discharge structure.

2 is a partially separated perspective view of a plasma display panel according to an embodiment of the present invention.

3 is a partial cross-sectional view taken along line III-III of FIG. 2.

FIG. 4 is a layout view of the first barrier rib, the first discharge electrodes, the second discharge electrodes, and the address electrodes shown in FIG. 2.

5 is a partial cross-sectional view of a plasma display panel according to another embodiment of the present invention.

FIG. 6 is a layout view of the first barrier rib, the first discharge electrodes, the second discharge electrodes, and the address electrodes shown in FIG. 5.

<Brief description of symbols for the main parts of the drawings>

200, 300: plasma display panel

210, 310: first substrate 220, 320: second substrate

230, 330: discharge cells 251, 351: phosphor layer

260 and 360: first discharge electrode 270 and 370: second discharge electrode

281, 381: First bulkhead 282, 382: Second bulkhead

290, 390: address electrode 291, 391: bus portion

292 and 392: discharge portions 292a and 392a: projections

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel with improved luminous efficiency.

Plasma display panel is a display panel that displays images by using gas discharge phenomenon. It is excellent in various display ability such as brightness, contrast, afterimage, and viewing angle, and it is being spotlighted as next generation large display panel because of its thin and large display. .

1 illustrates a plasma display panel 100 having a typical three-electrode surface discharge structure. The plasma display panel 100 includes a first substrate 101, sustain electrodes 106 and 107 disposed on the first substrate 101, a first dielectric layer 109 covering the sustain electrodes, and a first dielectric layer. The address electrode 117 and the address electrode 117 disposed parallel to each other on the protective layer 111, the second substrate 115 disposed to face the first substrate 101, and the second substrate 115. And a second dielectric layer 113 covering the first and second dielectric layers 113, a partition wall 114 formed on the second dielectric layer 113, and an upper surface of the second dielectric layer 113 and a phosphor layer 110 formed on side surfaces of the partition wall 114.

The plasma display panel 100 having the above structure has a low discharge gap and thus has a low luminous efficiency. In addition, since the number of discharge cells 119 increases as the plasma display panel becomes high resolution, when the address-display separation driving method (ADS driving method) is applied, the addressing time and power consumption according to the addressing are increased. There is a problem.

An object of the present invention is to provide a plasma display panel with improved luminous efficiency.

Another object of the present invention is to provide a plasma display panel having improved address discharge characteristics.

The present invention is a first substrate and a second substrate spaced apart from each other, and disposed between the first substrate and the second substrate, the first partition wall for partitioning a plurality of discharge cells, and within the first partition wall First discharge electrodes and second discharge electrodes disposed to face each other toward the inside of the discharge cells, and spaced apart from each other on the first substrate or the second substrate, and the first discharge electrodes and the second discharge The present invention provides a plasma display panel including address electrodes intersecting electrodes and electrically connected to the bus unit and the discharge unit having a plurality of protrusions formed on an outer circumferential surface thereof.

In the present invention, the protrusions may have a triangular shape.

In the present invention, the bus parts may be disposed to correspond to the non-discharge area. The first barrier rib may include horizontal barrier rib portions parallel to the address electrodes and vertical barrier rib portions crossing the horizontal barrier rib portions, and the bus portions may be disposed to correspond to the horizontal barrier rib portions. In this case, one side of the discharge units may be connected to the bus units, and the other side thereof may be formed to extend in the center direction of the discharge cells. In addition, each address electrode may include a plurality of discharge parts, and each discharge part may be disposed to correspond to the discharge cells.

In the present invention, the discharge portion may be formed of a material containing a transparent material.

In the present invention, the address electrodes may be disposed to correspond to the middle portion of the discharge cells. In this case, the bus unit and the discharge unit of each address electrode may be integrally formed using a material including a conductive metal. In addition, the address electrodes may be formed to be symmetric along the extending direction.

The plasma display panel may further include a dielectric layer covering the address electrodes. The plasma display panel may further include a second partition wall disposed between the second substrate and the first partition wall, and a phosphor layer disposed in a space defined by the second partition wall.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 4, a plasma display panel 200 according to an embodiment of the present invention is illustrated. FIG. 2 is a partially separated perspective view of the plasma display panel 200, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. 4 is a layout view of the first partition 281, the first discharge electrodes 260, the second discharge electrodes 270, and the address electrodes 290 shown in FIG. 2.

The plasma display panel 200 includes a first substrate 210 and a second substrate 220 spaced apart from each other and disposed to face each other. The first substrate 210 is generally made of a material having excellent light transmittance mainly containing glass. However, the first substrate 210 may be colored in order to reduce reflection brightness and improve clear room contrast. In addition, the second substrate 220 defines a plurality of discharge cells 230 between the first substrate 210 and the first substrate 210. The second substrate 220 is made of a material having excellent light transmittance such as glass, and may be colored.

The plasma display panel 200 includes a first partition 281 that defines a plurality of discharge cells 230. In FIG. 2, the first partition 281 is illustrated as partitioning the discharge cells 230 having a rectangular cross section, but is not limited thereto. That is, the first partition 281 may be formed such that the cross section of the discharge cells 230 is a polygon, such as a triangle, a quadrangle, a pentagon, or a circle, an ellipse, etc., in addition to the rectangle. The first partition 281 includes horizontal partitions 281b parallel to the address electrodes and vertical partitions 281a intersecting the horizontal partitions 281b. The first partition 281 is formed of a dielectric bar having the first discharge electrodes 260 and the second discharge electrodes 270 disposed therein.

The plasma display panel 200 includes first discharge electrodes 260 and second discharge electrodes 270. 2 and 3, the first discharge electrodes 260 and the second discharge electrodes 270 are disposed in the first partition 281. The first discharge electrode 260 pairs with the second discharge electrode 270 to generate a discharge in the discharge cell 230. The first discharge electrode 260 and the second discharge electrode 270 are disposed to face each other toward the inside of the discharge cell 230. In addition, the first discharge electrode 260 and the second discharge electrode 270 are arranged in parallel with each other. Since the distance between the first discharge electrode 260 and the second discharge electrode 270 is far, the first discharge electrode 260 and the second discharge electrode 270 cause a long gap discharge. Therefore, since the plasma display panel 200 discharges plasma using a positive column, the light emission efficiency is greatly improved.

Each of the first discharge electrode 260 and the second discharge electrode 270 functions in common to adjacent discharge cells. Referring to FIG. 3, the first discharge electrode 260 and the second discharge electrode 270 work in common with the discharge cells 230 disposed on both sides of the vertical partition portions 281a. Therefore, since the first discharge electrode 260 and the second discharge electrode 270 do not need to be disposed in one vertical partition portion 281a, the width of the vertical partition portion 281a can be reduced.

In the plasma display panel 200, a three-electrode structure is formed. Accordingly, one of the first discharge electrode 260 and the second discharge electrode 270 acts as a scan electrode, and the other acts as a sustain electrode. In the present embodiment, the first discharge electrodes 260 serve as the scan electrodes, and the second discharge electrodes 270 perform the functions of the sustain electrodes.

Referring to FIG. 3, since the first discharge electrodes 260 and the second discharge electrodes 270 are disposed in the first partition 281, the visible light transmittance is not reduced. Accordingly, the first discharge electrodes 260 and the second discharge electrodes 270 may be formed of a conductive metal such as aluminum or copper. Since the above-described conductive metal has a small voltage drop, the first discharge electrodes 260 and the second discharge electrodes 270 may perform stable signal transmission.

The first partition 281 prevents direct current from flowing between the adjacent first discharge electrodes 260 and the second discharge electrodes 270, and positive or negative electrons directly flow into the first and second discharge electrodes 260 and 270. The collision prevents damage to the first and second discharge electrodes 260 and 270. In addition, the first partition 281 functions to induce charge and to accumulate wall charge. Therefore, the first partition 281 is formed of a dielectric.

The plasma display panel 200 further includes address electrodes 290 spaced apart from each other in parallel on the first substrate 210. The address electrodes 290 cross the first discharge electrodes 260 and the second discharge electrodes 270. The address electrodes 290 are used to generate an address discharge for facilitating sustain discharge between the first discharge electrode 260 and the second discharge electrode 270. More specifically, the address electrodes 290 lower the voltage at which the sustain discharge starts. Do it.

Each address electrode 290 includes a stripe-shaped bus portion 291 and discharge portions 292 electrically connected to the bus portion 291. The bus unit 291 transmits an electrical signal to the discharge units 292, and is formed of a conductive metal such as aluminum and copper having excellent conductivity, thereby enabling stable signal transmission. However, since the bus portion 291 is generally opaque, it is preferable that the bus portion 291 is disposed in the non-discharge region. Referring to FIG. 4, the bus portion 291 is disposed to correspond to the horizontal partition walls 281b. One side of the discharge units 292 is connected to the bus unit 291, and the other side thereof is formed to extend in the center direction of the discharge cells 230. The discharge units 292 substantially generate an address discharge, and one discharge unit 292 is disposed to correspond to each discharge cell 230. In addition, the discharge parts 292 are formed of a material including a transparent material in order to improve visible light transmittance. Transparent materials include ITO.

A plurality of protrusions 292a are formed on the outer circumferential surface of the discharge parts 292. Reflecting the resolution and structure of the plasma display panel, the size, number and shape of the projections 292a may be variously selected. Referring to FIG. 4, protrusions 292a having a triangular shape are formed. Since the electric field lines are concentrated in the projections 292a during the address discharge, the discharge cells 230 have a discharge initiation effect. Thus, the address discharge voltage is reduced, and the discharge delay is greatly reduced.

The address electrodes 290 are covered by the dielectric layer 285. In addition, the plasma display panel 200 further includes protective layers 215 formed on side surfaces of the first partition wall 281. The protective layers 215 prevent plasma particles from damaging the first partition 281. In addition, the protective layers 215 emit secondary electrons to lower the discharge voltage. The protective layers 215 may be formed by depositing magnesium oxide (MgO) on the side of the first partition 281.

The second partition 282 is disposed between the second substrate 220 and the first partition 281. The second partition wall 282 defines a space in which the phosphor layers 251 are disposed. The second partition wall 282 preferably has substantially the same shape as the first partition wall 281, and may be integrally formed. The light reflection layer 286 is disposed between the second partition wall 282 and the second substrate 220. The light reflection layer 286 reflects the visible light generated by the discharge cells 230 to be projected onto the second substrate 220, thereby projecting it onto the first substrate 210. The light reflection layer 286 may be formed of a white dielectric layer.

Red, green, and blue light emitting phosphor layers 251 are disposed on the side surfaces of the second partition wall 282 and the light reflection layer 286. The phosphor layers 251 have a component that generates visible light by receiving ultraviolet rays, and the red light emitting phosphor layers include phosphors such as Y (V, P) O ₄ : Eu, and the green light emitting phosphor layers are Zn ₂ SiO _4. Phosphors such as: Mn, YBO ₃ : Tb, and the like, and the blue light emitting phosphor layers include phosphors such as BAM: Eu and the like. Since the coating area of the phosphor layers 251 is increased by the second partition 282, the luminance and the luminous efficiency of the plasma display panel 200 are improved.

Edges of the first substrate 210 and the second substrate 220 are coupled to each other by a sealing member such as frit glass. The discharge cells 230 are filled with discharge gases such as Ne, Xe, and the like, and mixtures thereof.

The driving method of the plasma display panel 200 according to the exemplary embodiment of the present invention having the above configuration is as follows.

First, an address discharge occurs between the first discharge electrode 260 and the address electrode 290, and as a result of the address discharge, the discharge cell 230 in which the sustain discharge occurs is selected. Subsequently, when an AC voltage is applied between the first discharge electrode 260 and the second discharge electrode 270 of the selected discharge cell 230, the first discharge electrode 260 and the second discharge electrode 270 are applied. Maintenance discharge occurs in the liver. Ultraviolet rays are emitted while the energy level of the discharged gas excited by this sustain discharge is lowered. The ultraviolet rays excite the phosphor layers 225. The energy levels of the excited phosphor layers 225 are lowered to emit visible light, and the emitted visible light forms an image.

5 and 6, a plasma display panel 300 according to another embodiment of the present invention is illustrated. 5 is a partial cross-sectional view of the plasma display panel 300, and FIG. 6 is a first partition 381, the first discharge electrode 360, the second discharge electrode 370 and the address electrode shown in FIG. 390 is a layout view. Hereinafter will be described with respect to the different points from the above-described embodiment.

The plasma display panel 300 includes a first substrate 310 and a second substrate 320 spaced apart from each other and disposed to face each other. The first substrate 310 and the second substrate 320 define a plurality of discharge cells 330 between them 310 and 320.

The plasma display panel 300 includes a first partition 381 that defines a plurality of discharge cells 330. In FIG. 6, the first partition 381 is shown to partition the discharge cells 330 having a rectangular cross section. The first partition 381 includes horizontal partitions 381b parallel to the address electrodes and vertical partitions 381a intersecting the horizontal partitions 381b. The first partition 381 is formed of a dielectric.

The plasma display panel 300 includes first discharge electrodes 360 and second discharge electrodes 370. Referring to FIG. 5, the first discharge electrodes 360 and the second discharge electrodes 370 are disposed in the first partition 381. The first discharge electrode 360 is paired with the second discharge electrode 370 to generate a discharge in the discharge cell 330. The first discharge electrode 360 and the second discharge electrode 370 are disposed to face each other toward the inside of the discharge cell 330. In addition, the first discharge electrode 360 and the second discharge electrode 370 are arranged in parallel with each other.

Each of the first discharge electrode 360 and the second discharge electrode 270 functions in common to adjacent discharge cells. Referring to FIG. 5, the first discharge electrode 360 and the second discharge electrode 370 generally work in common with discharge cells 330 disposed on both sides of the vertical partition portions 381a.

The plasma display panel 300 further includes address electrodes 390 spaced apart from each other in parallel on the second substrate 320. The address electrodes 390 intersect the first discharge electrodes 360 and the second discharge electrodes 370. The address electrodes 390 are disposed to correspond to the center portions of the discharge cells 330, and extend across the discharge cells 330 arranged along one row.

Each address electrode 390 includes a stripe-shaped bus portion 391 and discharge portions 292 electrically connected to the bus portion 391. Since the discharge parts 292 are formed to be symmetrical to the bus part 391, each address electrode 390 has a shape symmetrical with respect to the extending direction. Since the bus portion 319 and the discharge portion 392 are disposed at positions not shielding visible light, the bus portion 319 and the discharge portion 392 may be formed of a conductive metal such as aluminum and copper having excellent conductivity. In addition, the bus unit 319 and the discharge unit 392 of each address electrode may be integrally formed.

  A plurality of protrusions 392a are formed on the outer circumferential surface of the discharge parts 292. Reflecting the resolution and structure of the plasma display panel, the size, number and shape of the projections 392a may be variously selected. Referring to FIG. 6, protrusions 392a having a triangular shape are formed. Since the electric field lines are concentrated in the protrusions 392a during the address discharge, the discharge cells 330 have a discharge initiation effect. Thus, the address discharge voltage is reduced, and the discharge delay is greatly reduced.

The address electrodes 390 are covered by the dielectric layer 385. In order to reflect visible light projected onto the second substrate 320, the dielectric layer 385 is preferably white in color. In addition, the plasma display panel 300 further includes protective layers 315 formed on side surfaces of the first partition 381.

A second partition 382 is disposed between the dielectric layer 385 and the first partition 381. The second partition 382 defines a space in which the phosphor layers 351 are disposed. Red, green, and blue light emitting phosphor layers 351 are disposed on the side surfaces of the second partition 382 and the dielectric layer 385.

Edges of the first substrate 310 and the second substrate 320 are coupled to each other by a sealing member. The discharge cells 330 are filled with discharge gases such as Ne, Xe, and the like, and mixtures thereof.

The driving method of the plasma display panel 300 according to the exemplary embodiment of the present invention having the above configuration is similar to the driving method of the above-described exemplary embodiment, and thus the description thereof is omitted here.

In the plasma display panel according to the present invention, since long gap discharge occurs between the first discharge electrodes and the second discharge electrodes, the light emission efficiency is improved. In addition, since the electric field is concentrated in the projections of the discharge portions of the address electrodes, the address discharge voltage is reduced, and the address discharge delay phenomenon is reduced.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (13)

A first substrate and a second substrate spaced apart from each other to face each other; A first partition wall disposed between the first substrate and the second substrate and partitioning a plurality of discharge cells; And First and second discharge electrodes disposed to face each other in the discharge cells in the first partition wall; And Disposed on the first substrate or the second substrate and spaced apart from each other, intersecting the first discharge electrodes and the second discharge electrodes, and electrically connected to the bus unit and the bus unit, respectively, and a plurality of protrusions are formed on an outer circumferential surface thereof. A plasma display panel comprising address electrodes having a discharge unit. The method of claim 1, The protrusions have a triangular shape plasma display panel. The method of claim 1, And the bus units are arranged to correspond to the non-discharge area. The method of claim 3, The first partition includes horizontal partitions parallel to the address electrodes and vertical partitions intersecting the horizontal partitions, And the bus units are arranged to correspond to the horizontal partition walls. The method of claim 4, wherein One side of the discharge units is connected to the bus units, and the other side of the discharge unit extends in a center direction of the discharge cells. The method of claim 4, wherein Each address electrode includes a plurality of discharge parts, And a discharge unit disposed to correspond to the discharge cell. The method of claim 1, The discharge unit is a plasma display panel formed of a material containing a transparent material. The method of claim 1, And the address electrodes are disposed to correspond to a center portion of the discharge cells. The method of claim 8, And the address electrodes are formed of a material containing a conductive metal. The method of claim 8, And a bus portion and a discharge portion of each address electrode are integrally formed. The method of claim 1, And a symmetry along the direction in which the address electrodes extend. The method of claim 1, And a dielectric layer covering the address electrodes. The method of claim 1, A second partition wall disposed between the second substrate and the first partition wall; And And a phosphor layer disposed in a space defined by the second partition wall.

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