KR20050104187A - Plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel having a discharge cell and a non-discharge cell, and which has improved luminous efficiency. A first partition wall formed of a dielectric material and a front discharge electrode disposed in the first partition wall to surround the discharge cell; And a plasma display panel including rear discharge electrodes spaced apart from the front discharge electrode, a phosphor layer disposed in the discharge cell, and a discharge gas in the discharge cell. to provide.

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a discharge cell and a non-discharge cell, and which has improved luminous efficiency.

The device employing the plasma display panel has a large screen, high quality, ultra-thin, light weight, and excellent characteristics of wide viewing angle, and is simpler to manufacture than other flat panel display devices and is easy to be enlarged. It has been in the spotlight as a flat panel display device.

The plasma display panel is classified into a direct current (DC) type, an alternating current (AC) type, and a hybrid type according to an applied discharge voltage, and may be classified into a counter discharge type and a surface discharge type according to a discharge structure. In general, an AC plasma display panel having an AC three-electrode surface discharge structure is generally employed.

FIG. 1 illustrates a conventional AC three-electrode surface discharge plasma display panel 100.

The illustrated plasma display panel 100 includes an upper plate 110 and a lower plate 120.

The upper plate 110 includes the front substrate 111, the common electrodes 112 formed on the bottom surface of the front substrate 111, the scan electrodes 113 forming a discharge gap with the common electrodes 112, and the common electrode. And a protective layer 115 formed on the lower surface of the first dielectric layer 114 and the first dielectric layer 114 filling the 112 and the scan electrodes 113.

The lower plate 120 is disposed on the rear substrate 121, the rear substrate 121, and the address electrodes 122 formed to intersect the common electrodes 112 and the scan electrodes 113, and the address. The second dielectric layer 123 filling the electrodes 122, the partition walls 128 formed on the upper surface of the second dielectric layer 123 at predetermined intervals to define the discharge spaces 125, and the discharge cells 125. Phosphor layers 126 and discharge cells 125 are provided with a filled discharge gas (not shown).

In the conventional three-electrode surface discharge type plasma display panel 100 shown in FIG. 1, the visible light emitted from the phosphor layer 126 includes the scan electrode 113 and the common electrode disposed on the lower surface of the front substrate 111. A large portion (approximately 40%) is absorbed by (112), the dielectric layer 114 covering the electrodes 112 and 113, and the protective layer 115, and thus there is a problem that the luminous efficiency is low.

In addition, when the conventional three-electrode surface discharge type plasma display panel 100 displays the same image for a long time, the phosphor layer 110 is ion-sputtered by charged particles of discharge gas, thereby causing permanent afterimages. There was a problem causing.

In particular, since one discharge cell 125 has a structure surrounded by other discharge cells, it is difficult to effectively discharge heat generated in the discharge cells, thereby reducing the luminance and the luminous efficiency. .

In order to solve the above problems, an object of the present invention is to provide a plasma display panel having discharge cells and non-discharge cells, and which has improved luminous efficiency.

In order to achieve the above and other objects, the present invention provides:

Transparent front substrate;

A rear substrate disposed in parallel with the front substrate;

A first partition wall disposed between the front substrate and the rear substrate and defining discharge cells and non-discharge cells together with the front substrate and the rear substrate and formed of a dielectric;

Front discharge electrodes disposed in a first partition wall to surround the discharge cell;

Rear discharge electrodes disposed in a first partition wall to surround the discharge cell and spaced apart from the front discharge electrode;

A phosphor layer disposed in the discharge cell; And

A plasma display panel having a discharge gas in the discharge cell is provided.

In the present invention, preferably, in the plasma display panel, the first partition wall is formed in a matrix shape, the discharge cells have a rectangular cross section, and the non-discharges are formed between discharge cells arranged in a direction in which the address electrodes extend. Cells can be placed.

Here, it is preferable that the adjacent non-discharge cells are open.

In the present invention, preferably, in the plasma display panel, the first barrier rib may have a matrix shape, the discharge cells may have a hexagonal cross section, and the non-discharge cells may have a closed structure.

In the present invention, preferably, in the plasma display panel, a light absorbing dark layer may be applied to the non-discharge cells.

In the present invention, preferably, in the plasma display panel, the front discharge electrodes may extend in one direction, and the rear discharge electrodes may extend to cross the front discharge electrode in the discharge cell.

In the present invention, preferably, in the plasma display panel, the front discharge electrodes and the rear discharge electrodes extend in one direction, and the address electrodes extend to cross the front discharge electrode and the rear discharge electrode in the discharge cell. It may be further provided.

In this case, the address electrode may be disposed between the rear substrate and the phosphor layer, and a dielectric layer may be disposed between the phosphor layer and the address electrode.

In the present invention, preferably, the plasma display panel may further include a second partition wall defining a discharge cell together with the first partition wall.

In this case, the phosphor layer may be disposed at the same level as the second partition wall.

In the present invention, preferably, in the plasma display panel, each of the front discharge electrodes and the rear discharge electrodes may have a ladder shape.

In the present invention, preferably, at least a side surface of the first partition wall may be covered by a protective film in the plasma display panel.

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

A plasma display panel 200 according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

The plasma display panel 200 is disposed between the transparent front substrate 201, the rear substrate 202 disposed in parallel with the front substrate 201, the front substrate 201 and the rear substrate 202, and A first substrate disposed between the front substrate 201 and the rear substrate 202 and defining the discharge cells 220 and the non-discharge cells 230 together with the front substrate 201 and the back substrate 202 and formed of a dielectric material. The partition 208, the front discharge electrodes 206 disposed in the first partition 208 to surround the discharge cell 220, and the first partition 208 to surround the discharge cell 220, And a rear discharge electrode 207 spaced apart from the front discharge electrode 206, a phosphor layer 210 disposed in the discharge cell 220, and a discharge gas (not shown) disposed in the discharge cell.

The transparent front substrate 201 is made of a material having good light transmittance such as glass. Since the electrodes 112 and 113 which existed on the front substrate of the conventional plasma display panel do not exist in the front substrate 201, the front transmittance of visible light is remarkably improved. Therefore, if the image is realized with the luminance of the conventional level, the electrodes 112 and 113 are driven at a relatively low voltage, thereby improving luminous efficiency.

The first partition wall 208 formed below the front substrate 201 has one subpixel among the red light emitting subpixel 220R, the green light emitting subpixel 220G, and the blue light emitting subpixel 220B. The discharge cells 220 corresponding to the same are partitioned and erroneous discharges are prevented from occurring between the discharge cells 220. As shown in FIG. 5, the first partition wall 208 is formed to partition the discharge cells 220 having a rectangular matrix shape. In addition, the non-discharge cells 230 are disposed between the discharge cells 220 adjacent in the direction in which the address electrode 203 extends (y direction). In the non-discharge cells 230, since the front discharge electrode 206 and the rear discharge electrode 207 are not disposed, no discharge occurs. The non-discharge cells 230 are partitioned in the y direction by the first partition 208, but have an open structure in the x direction perpendicular to the y direction. Therefore, the open passage formed in the x direction of the non-discharge cell 230 has an advantage that it can be used as the exhaust passage of the impure gas in the sealing / exhaust process of the plasma display panel 200.

In the plasma display panel 200 according to an embodiment of the present invention, the discharge is formed in a closed curve along the side surface of the discharge cell 220 and gradually diffuses to the center portion of the discharge cell 220 to discharge the entire discharge cell. This will happen. Therefore, discharge efficiency and discharge uniformity are secured, but heat generation due to discharge is concentrated in the discharge cell. When heat is not effectively emitted to the outside, there is a possibility that problems such as reduction in luminance and reduction in luminous efficiency exist. However, in the present invention, the non-discharge cells 230 disposed between the discharge cells 220 may be used as heat dissipation spaces of the discharge cells 220. That is, between the discharge cells 220 in which heat generation is concentrated, a buffer unit in which heat generation does not occur is placed, so that the amount of heat generated is reduced, and heat generated in the discharge cells 220 is transferred to the non-discharge cells 230. Through the part it can be released to the outside of the heat.

The location of these non-discharge cells 230 is not limited to the above.

In addition, the light-absorbing material layer 235 is coated on the non-discharge cells 230. In this case, the light absorbing material layer 235 preferably has a visible light absorption of 50% to 100%, and generally has a dark color. As described above, the non-discharge cells 220 may not only be used as heat dissipation spaces but also absorb external light, thereby reducing external light reflection luminance. Thus, the clear room contrast of the plasma display panel 200 is improved.

The first partition 208 prevents the front discharge electrode 206 and the rear discharge electrode 207 from directly energizing during discharge, and prevents charged particles from directly colliding with the electrodes 206 and 207 to damage them. It is formed as a dielectric that can induce charged particles to accumulate wall charges. Such dielectrics include PbO, B ₂ O ₃ , SiO _2, and the like.

As shown in FIG. 4, in the first partition 208, the front discharge electrode 206 and the rear discharge electrode 207 surrounding the discharge cell 220 are disposed in parallel. The front discharge electrode 206 and the rear discharge electrode 207 are formed of a conductive metal such as aluminum or copper. In addition, the front discharge electrode 206 and the rear discharge electrode 207 are spaced apart from each other in the vertical direction and extend in parallel. At this time, the front discharge electrode 206 and the rear discharge electrode 207 is preferably formed to be symmetrical up and down.

In addition, since the address discharge occurs efficiently when the distance between the scan electrode and the address electrode is narrow, in one embodiment according to the present invention, the rear discharge electrode 206 close to the address electrode 203 acts as the scan electrode and the front side. The discharge electrode 207 serves as a common electrode. However, even when there is no address electrode, since the discharge can be performed between the front discharge electrode and the rear discharge electrode, the present invention is not limited to the structure provided with the address electrode. However, when there is no address electrode, the rear discharge electrode extends to cross the front discharge electrode in one discharge cell.

At least the side surfaces of the first partition wall 208 are preferably covered by the MgO film 209 as the protective film 209. Although the MgO film 209 is not an essential component, it prevents charged particles from colliding with the first partition 208 formed of the dielectric and damaging the first partition 208, and emits a lot of secondary electrons upon discharge. .

The second substrate 202 supports the address electrodes 203, the dielectric layer 204, and the like, and is typically made of a material mainly composed of glass.

The address electrodes 203 are disposed on the back substrate 202 in a direction in which one row of discharge cells 220 extends. The address electrodes 203 extend in the discharge cell 220 in a direction intersecting the front discharge electrode 207 and the rear discharge electrode 206.

The address electrodes 203 are used to generate an address discharge for facilitating a sustain discharge between the front discharge electrode 206 and the rear discharge electrode 207. More specifically, the address electrodes 203 lower the voltage at which the sustain discharge starts. . The address discharge is a discharge occurring between the scan electrode and the address electrode. When the address discharge is completed, cations are accumulated on the scan electrode side and electrons are accumulated on the common electrode side, thereby making it easier to sustain discharge between the scan electrode and the common electrode.

As shown, the dielectric layer 204 in which the address electrode 203 is embedded can induce charge while preventing cations or electrons from colliding with the address electrode 203 and damaging the address electrode 203 during discharge. It is formed as a dielectric, which is PbO, B ₂ O ₃ , SiO ₂ and the like.

The plasma display panel 200 according to the present invention further includes a second partition 205 disposed between the first partition 208 and the back substrate 202 to define discharge cells together with the first partition 208. It can be provided. In FIG. 2, the first partition 208 and the second partition 205 are partitioned in a matrix, but the present invention is not limited thereto. As long as a plurality of discharge spaces may be formed, partitions of various patterns, for example, Open bulkheads, such as stripes, may of course be closed bulkheads, such as waffles, matrices, deltas, and the like. In addition, the closed partition wall may be formed such that the cross section of the discharge space becomes a polygon such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the quadrangle as in the present embodiment. First Embodiment As shown, the first and second partitions 208 and 205 may be formed to have the same shape, but may be formed to have different shapes.

As shown in FIG. 4, the phosphor layer 210 is formed at the same level as the second partition wall 205, and is preferably disposed between the side surfaces of the second partition wall 205 and the second partition walls 205. It is applied on the back substrate 202.

The phosphor layer 210 has a component that receives ultraviolet rays and generates visible light. The phosphor layer 210R formed in the red light emitting subpixel includes phosphors such as Y (V, P) O ₄ : Eu, and emits green light. The phosphor layer 210G formed on the subpixel includes phosphors such as Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and the like, and the phosphor layer 210B formed on the blue light emitting subpixel includes phosphors such as BAM: Eu.

In the discharge cell 220, a discharge gas such as Ne, Xe, and the like and a mixed gas thereof is encapsulated. In the present invention including this embodiment, the discharge surface can be increased and the discharge region can be enlarged, so that the amount of plasma formed is increased, thereby enabling low voltage driving. Therefore, in the case of the present invention, even when a high concentration of Xe gas is used as the discharge gas, low voltage driving is possible, thereby significantly improving the luminous efficiency. This solves the problem of low voltage driving when using a high concentration of Xe gas as a discharge gas in a conventional plasma display panel.

In the plasma display panel 200 according to the embodiment of the present invention having the above-described configuration, address discharge occurs by applying an address voltage between the address electrode 203 and the rear discharge electrode 206. As a result, the discharge cell 220 in which sustain discharge is to be generated is selected.

Thereafter, when a sustain discharge voltage, which is an alternating current, is applied between the front discharge electrode 206 and the rear discharge electrode 207 of the selected discharge cell 220, the sustain discharge between the front discharge electrode 206 and the rear discharge electrode 207 is applied. This happens. 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 layer 210 coated in the discharge cell 220. As the energy level of the excited phosphor layer 210 decreases, visible light is emitted, and the emitted visible light forms an image. .

In the conventional plasma display panel shown in FIG. 1, the sustain discharge between the scan electrode 113 and the common electrode 112 occurs in the horizontal direction, so that the discharge area is relatively narrow. However, the sustain discharge of the plasma display panel 200 according to the present embodiment may occur not only in all aspects of defining the discharge cells 220 but also in that the discharge area is relatively large.

In addition, the sustain discharge in this embodiment is formed in a closed curve along the side of the discharge cell 220 and gradually diffuses to the center portion of the discharge cell 220. As a result, the volume of the region where the sustain discharge occurs is increased, and the space charge in the discharge cell, which is not well used in the past, also contributes to light emission. Such matters result in the improvement of the luminous efficiency of the plasma display panel.

In addition, in the plasma display panel according to the present exemplary embodiment, as shown in FIG. 3, the sustain discharge is performed only at the portion defined by the first partition wall 208. Ion sputtering is prevented, and thus there is an advantage that permanent afterimages do not occur even when the same image is displayed for a long time.

6 illustrates discharge cells 320 and non-discharge cells 330 of the plasma display panel 300 according to an embodiment of the present invention. The discharge cells 320 are the same as the plasma display panel 200 according to the exemplary embodiment, except that the first partition 308 defines the hexagonal matrix discharge cells 320. . The discharge cells 330 include a red light emitting subpixel 320R, a green light emitting subpixel 320G, and a blue light emitting subpixel 320B constituting one pixel.

Referring to the drawings, rectangular non-discharge cells 330 are surrounded by four hexagonal discharge cells 320. However, the shape of the non-discharge cell 330 may be formed in various ways, such as a circle, a triangle, as well as a square.

As described above, the non-discharge cells 330 may be used as discharge paths of heat generated in the adjacent discharge cells 320. In addition, due to the light absorbing material layer 335 applied to the non-discharge cell 320, the external light reflection luminance is reduced, and the contrast is increased. However, since the non-discharge cells 330 have a closed structure by the discharge cells 320, an open passage connecting the non-discharge cells 330 is different from the plasma display panel 200 according to an exemplary embodiment. It is not formed. Therefore, it is difficult for non-discharge cells to be used as exhaust passages.

Like reference numerals in the drawings shown above indicate the same members.

The plasma display panel according to the present invention has the following effects.

First, since the non-discharge cells, which are non-discharge regions, are disposed between the discharge cells, heat generated in the discharge cells can be effectively discharged through the non-discharge cells. Therefore, the brightness and luminous efficiency of the plasma display panel are improved.

Second, when the light absorbing material layer is applied to the non-discharge cells, the clear room contrast is improved without reducing the luminance in the discharge cells.

Third, since the surface discharge can be generated in all aspects forming the discharge space, the discharge surface can be greatly enlarged.

Fourth, since the discharge is generated in terms of forming the discharge cell and diffused to the center portion of the discharge cell, the discharge area is remarkably improved compared with the conventional one, so that the entire discharge cell can be efficiently used. Therefore, the driving can be performed even at a low voltage, thereby significantly improving the luminous efficiency.

Fifth, since the plasma display panel and the flat panel display device having the same according to the present invention can be driven at a low voltage as described above, even when a high concentration of Xe gas is used as the discharge gas, a low voltage can be driven to improve luminous efficiency. .

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.

1 is a partial cutaway perspective view showing a conventional plasma display panel;

2 is a partially cutaway perspective view illustrating a plasma display panel according to an embodiment of the present invention;

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

4 is a partial cutaway perspective view illustrating only the discharge cells and the electrodes shown in FIG. 2;

5 is a cross-sectional view illustrating a structure of discharge cells shown in FIG. 2;

FIG. 6 is a cross-sectional view corresponding to FIG. 5 as a modification of the plasma display panel of FIG. 2.

Explanation of symbols on main parts of drawing

200: plasma display panel 201: front substrate

202: back substrate 203: address electrode

204 dielectric layer 205 second partition wall

206: front discharge electrode 207: rear discharge electrode

208: first bulkhead 209: protective film

210: phosphor layer 220: discharge cell

230: non-discharge cell 235: light absorbing material layer

Claims (12)

Transparent front substrate; A rear substrate disposed in parallel with the front substrate; A first partition wall disposed between the front substrate and the rear substrate and defining discharge cells and non-discharge cells together with the front substrate and the rear substrate and formed of a dielectric; Front discharge electrodes disposed in a first partition wall to surround the discharge cell; Rear discharge electrodes disposed in a first partition wall to surround the discharge cell and spaced apart from the front discharge electrode; A phosphor layer disposed in the discharge cell; And And a discharge gas in the discharge cell. The method of claim 1, The first partition wall is formed in a matrix shape, the discharge cells have a rectangular cross section, the non-discharge cells are disposed between the discharge cells arranged in the direction in which the address electrodes extend. The method of claim 2, And the adjacent non-discharge cells are open. The method of claim 1, And the first barrier rib is formed in a matrix shape, the discharge cells have a hexagonal cross section, and the non-discharge cells have a closed structure. The method of claim 1, And a light absorbing dark layer is applied to the non-discharge cells. The method of claim 1, And the front discharge electrodes extend in one direction, and the rear discharge electrodes extend to intersect the front discharge electrode in the discharge cell. The method of claim 1, The front discharge electrodes and the rear discharge electrodes extend in one direction, And an address electrode extending from the discharge cell to intersect the front discharge electrode and the rear discharge electrode. The method of claim 7, wherein And the address electrode is disposed between the rear substrate and the phosphor layer, and a dielectric layer is disposed between the phosphor layer and the address electrode. The method of claim 1, And a second partition wall defining a discharge cell together with the first partition wall. The method of claim 9, And the phosphor layer is disposed at the same level as the second partition wall. The method of claim 1, And each of the front discharge electrodes and the rear discharge electrodes has a ladder shape. The method of claim 1, And at least a side surface of the first partition wall is covered by a protective film.