KR20050095005A - Plasma display panel - Google Patents

Abstract

The present invention has been made in an effort to provide a plasma display panel with improved luminous efficiency and reduced discharge failure. To achieve this object, the present invention provides a transparent front substrate, a rear substrate disposed in parallel with the front substrate, An upper partition formed between the front substrate and the rear substrate and partitioning the light emitting cells, the upper partition formed of a dielectric, an upper sustain electrode, a lower sustain electrode and a first floating electrode disposed in the upper partition to surround the light emitting cell, and the upper partition And a lower partition wall disposed between the rear substrate and the rear substrate, a phosphor layer disposed in a space defined by the lower partition wall, and a discharge gas in the light emitting cell, and extending in one direction on a front substrate facing the light emitting cell. It provides a plasma display panel characterized in that at least one groove is formed.

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel that implements an image using gas discharge.

Recently, a device employing a plasma display panel as a flat panel display device has a large screen and has excellent characteristics of high definition, ultra-thin, light weight, and wide viewing angle, and is easier to manufacture than other flat panel display devices. It is attracting attention as a large 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 classified into a counter discharge type and a surface discharge type according to a discharge structure.

In the DC plasma display panel, all electrodes are exposed to a discharge space, and charges are directly transferred between the corresponding electrodes. In the AC plasma display panel, at least one electrode is surrounded by a dielectric layer, and discharge is performed by an electric field of wall charge instead of direct charge transfer between the corresponding electrodes.

In the DC plasma display panel, since the charge is directly transferred between the corresponding electrodes, there is a problem in that the electrode is severely damaged. In recent years, an AC plasma display panel having an AC type, in particular, a three-electrode surface discharge structure is present. This has been generally employed.

In the conventional three-electrode surface discharge type plasma display panel shown in FIG. 1, the visible light emitted from the phosphor layer 110 includes the scan electrode 106 and the common electrode 107 disposed on the lower surface of the front substrate 101. A large portion (approximately 40%) is absorbed by the bus electrode 108, the dielectric layer 109 covering the electrodes 106, 107, and 108, and the MgO film 111, and thus the luminous efficiency is low. there was.

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

In particular, when the closed barrier ribs are formed, impurity gas generated in the sealing process of the plasma display panel 100 is blocked by the closed barrier ribs and thus cannot be effectively removed, resulting in poor discharge such as overdischarge.

In order to solve the above problems, an object of the present invention is to provide a plasma display panel with improved luminous efficiency and reduced discharge failure.

In order to achieve the above and other objects, the present invention provides a transparent front substrate, a rear substrate disposed in parallel with the front substrate, disposed between the front substrate and the rear substrate, partitioning the light emitting cells, In the space defined by the formed upper partition, the upper sustain electrode disposed in the upper partition to surround the light emitting cell, the lower sustain electrode and the first floating electrode, the lower partition disposed between the upper partition and the rear substrate, the lower partition A plasma display panel comprising a phosphor layer disposed thereon and a discharge gas in the light emitting cell, and at least one groove extending in one direction on a front substrate facing the light emitting cell; To provide.

In the present invention, the plasma display panel preferably includes the upper sustain electrode, the lower sustain electrode, and the first floating electrode extending in one direction in parallel with each other, and the upper sustain electrode, the lower sustain electrode, and the first floating electrode. It may further include address electrodes extending to intersect.

In this case, preferably, a side surface of the upper partition wall is covered by an MgO film, the address electrodes are disposed between the rear substrate and the phosphor layer, and a dielectric layer may be formed between the address electrodes and the phosphor layer.

In the present invention, preferably, in the plasma display panel, the first floating electrode may extend in one direction in parallel between the upper sustain electrode and the lower sustain electrode.

In the present invention, preferably, the plasma display panel may further include at least one second floating electrode disposed to extend in one direction in the front substrate.

In the present invention, preferably, in the plasma display panel, the upper sustain electrode and the lower sustain electrode may be disposed in a vertical direction.

In this case, the upper sustain electrode may serve as a common electrode, and the lower sustain electrode may serve as a scan electrode.

In the present invention, preferably, the lower surface of the front substrate may be covered by an MgO film in the plasma display panel.

In the present invention, preferably, in the plasma display panel, the upper partition wall and the lower partition wall may be integrally formed.

Next, a plasma display panel 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 according to the present embodiment includes a transparent front substrate 201, a rear substrate 202 disposed in parallel with the front substrate 201, a light emitting cell disposed between the front substrate 201 and the rear substrate 202. The upper partition walls 208 formed of a dielectric material, an upper partition electrode 207 and a lower sustain electrode disposed in the upper partition wall 208 so as to surround the light emitting cells 220 and extending in one direction in parallel to each other. 206, an MgO film 209 covering side surfaces of the first floating electrode 215 and the upper partition wall 208 disposed between the upper sustain electrode 207 and the lower sustain electrode 206 to surround the light emitting cell 220. ), An address electrode 203, an upper barrier rib 208, and a rear substrate extending between the upper sustain electrode 207 and the lower sustain electrode 206 and disposed between the rear substrate 202 and the phosphor layer 210. Lower partition wall 205 disposed between 202, phosphor layer 210 disposed in a space defined by lower partition wall 205, ship A dielectric layer 204 is formed between the surface substrate 202 and the phosphor layer 210 to cover the address electrode 203, and a discharge gas (not shown) in the light emitting cell 220 is provided.

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

The address electrodes 203 disposed on the rear substrate 202 in a direction in which one row of the light emitting cells 220 extend may facilitate the sustain discharge between the lower sustain electrode 206 and the upper sustain electrode 207. In order to cause an address discharge for the battery, more specifically, it serves to lower the voltage at which the sustain discharge is started. The address discharge is a discharge occurring between the scan electrode and the address electrode 203. When the address discharge is completed, cations accumulate on the scan electrode side and electrons accumulate on the common electrode side, thereby making it easier to sustain discharge between the scan electrode and the common electrode. Done. Since the address discharge occurs efficiently when the interval between the scan electrode and the address electrode 203 is narrow, in the embodiment according to the present invention, the lower sustain electrode 206 close to the address electrode 203 is used as the scan electrode. The upper sustain electrode 207 is used as the common electrode. However, even when there is no address electrode 203, since discharge can be performed between the upper sustain electrode 207 and the lower sustain electrode 206, the present invention is not limited to the structure provided with the address electrode.

The dielectric layer 204 in which the address electrode 203 is embedded is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the address electrode 203 and causing damage to the address electrode 203 during discharge. Such dielectrics include PbO, B ₂ O ₃ , SiO _2, and the like.

The upper partition 208 partitions the light emitting cells 220 corresponding to one of the red light emitting pixel, the green light emitting subpixel, and the blue light emitting subpixel constituting one pixel, and between the light emitting cells 220. Prevents false discharges. The lower partition 205 is disposed between the upper partition 208 and the dielectric 205 to partition the space between the upper partition 208 and the dielectric 205. The phosphor 210 is coated on the side surface of the lower partition wall 205. In FIG. 2, the upper and lower partitions 208 and 205 are partitioned in a matrix form. However, the present invention is not limited thereto, and as long as a plurality of discharge spaces can be formed, various types of partitions, for example, an open type such as a stripe, may be used. The bulkhead may, of course, be a closed bulkhead such as waffle, matrix, delta, 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. As illustrated, the upper partition 208 and the lower partition 205 may be formed to have the same shape, but may be formed to have different shapes.

The upper partition 208 prevents the upper sustain electrode 207 and the lower sustain electrode 206 from directly energizing during sustain discharge, and prevents charged particles from directly colliding with the electrodes 206 and 207 and damaging them. And a dielectric material capable of inducing charged particles to accumulate wall charges. Such dielectrics include PbO, B ₂ O ₃ , and SiO ₂ .

The side surface of the upper partition 208 is preferably covered by the MgO film 209. Although the MgO film 209 is not an essential component, it prevents the charged particles from colliding with the upper partition 208 formed of the dielectric and damaging the upper partition 208, and releasing a lot of secondary electrons upon discharge.

In the present invention, the upper partition 208 and the lower partition 205 may be formed separately, they may be formed integrally.

As illustrated in FIGS. 2 and 3, a groove 226 extending in one direction is formed on the front substrate 201 facing the light emitting cells 220. Since the groove 226 may be used as an exhaust passage of the plasma display panel 200, the impurity gas generated during the sealing process of the plasma display panel may be smoothly exhausted to the outside. Therefore, the problem of the discharge failure of the plasma display panel by the impurity gas is reduced. The groove 226 formed on the front substrate may be formed in plural in consideration of exhaust.

The lower sustain electrode 206 and the upper sustain electrode 207 are electrodes for sustain discharge, and a sustain discharge that implements an image of the plasma display panel occurs between the electrodes. The lower sustain electrode 206 and the upper sustain electrode 207 are made of a conductive metal such as aluminum or copper. The lower sustain electrode 206 extends to intersect the address electrode 203, which means that a row of light emitting cells through which the address electrode 203 passes and a column of light emitting cells through which the lower sustain electrode 206 passes. . In addition, the upper sustain electrode 207 and the lower sustain electrode 206 extend in parallel in the vertical direction, indicating that one electrode of the upper sustain electrode 207 and the lower sustain electrode 206 is disposed at a higher position than the other electrode. it means.

In one embodiment according to the present invention, the upper sustain electrode 207 and the lower sustain electrode 206 are arranged to surround the upper partition 208 as shown in FIG. 4.

As shown in FIGS. 2 and 3, the floating electrode 215 extends in parallel with the upper sustain electrode 207 and the lower sustain electrode 206, and is disposed between them 207 and 206. In the plasma display panel 200 according to the exemplary embodiment, the floating electrode 215 is formed to surround the discharge cell 220. The floating electrode 215 is not connected to an active voltage source and is formed of a material having high electrical conductivity.

The position at which the floating electrode 215 is disposed is not limited between the upper sustain electrode 207 and the lower sustain electrode 206, and may be disposed at any portion surrounding the discharge cell 220. In addition, although the number of floating electrodes 215 is one in FIGS. 2 and 3, a plurality of floating electrodes may be disposed.

As shown in FIG. 5, the plasma display panel 200 according to the present invention may further include two second floating electrodes 217 disposed in one direction from left and right of the groove 235. In the plasma display panel 200 having such a structure, since the discharge is performed not only on the side of the upper partition 208 on which the sustain electrodes 206 and 207 are located, but also on the front substrate 201, the discharge region is enlarged and discharged. The efficiency is improved and the discharge voltage is reduced. In addition, since the groove 235 is formed between the two second floating electrodes 217, the discharge area is increased to improve the discharge efficiency.

However, since visible light due to discharge is transmitted through the front substrate 201, the second floating electrode 217 disposed on the front substrate 201 is preferably made of a transparent electrode such as ITO.

In addition, as shown in FIG. 6, the second floating electrode 217 may be disposed on a portion of the front substrate 201 where the groove 235 is formed.

However, the position and shape of the second floating electrode disposed in the front substrate 201 is not limited to the above-described example.

As shown in FIG. 3, the phosphor layer 210 is coated on the dielectric layer 210 facing the lower partition wall 205 and the discharge cell 220. The phosphor layer 210 includes a component which receives ultraviolet rays emitted by a sustain discharge between the upper sustain electrode 207 and the lower sustain electrode 206 and emits visible light, and the phosphor layer 210 formed on the red light emitting subpixel. Includes a phosphor such as Y (V, P) O ₄ : Eu, and the phosphor layer 210 formed in the green light emitting subpixel includes a phosphor such as Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and the like, and emits blue light. The phosphor layer 210 formed on the subpixel includes phosphors such as BAM: Eu and the like.

The light emitting cell 220 is filled with a discharge gas such as Ne, Xe and the like and a mixture of these. 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.

The transparent front substrate 201 is made of a material having good light transmittance such as glass. The front substrate 201 includes a scan electrode 106 formed of an indium tin oxide (ITO) film, a common electrode 107, a bus electrode 108 formed of metal, and the electrode, which are present on the front substrate of a conventional plasma display panel. Since there is no dielectric layer 109 covering the fields 106, 107, 108, the front transmittance of visible light is remarkably improved. Therefore, if the image is realized with the luminance of the conventional level, the electrodes 106 and 107 are driven at a relatively low voltage, thereby improving the luminous efficiency.

Although the MgO film 229 is formed on the front substrate facing the discharge cell 220, the MgO film 229 is not an essential component of the present invention.

In the plasma display panel 200 according to the embodiment of the present invention having the above-described configuration, an address voltage is applied between the address electrode 203 and the lower sustain electrode 206 to generate an address discharge. As a result, the light emitting 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 lower sustain electrode 206 and the upper sustain electrode 207 of the selected light emitting cell 220, the sustain discharge is discharged between the upper sustain electrode 207 and the lower sustain electrode 206. This happens. In addition, the first and second floating electrodes 215 and 217 have a potential between the potential of the upper sustain electrode 207 and the potential of the lower sustain electrode 206, and the lower sustain electrode 206 and the upper sustain electrode 207. ) Causes a sustain discharge. 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 light emitting 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 106 and the common electrode 107 occurs in the horizontal direction, so that the discharge area is relatively narrow. However, since the sustain discharge of the plasma display panel 200 according to the present embodiment occurs in all directions defining the discharge cells 220 in the vertical direction, the discharge area is relatively wide.

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 embodiment, as shown in FIG. 3, since the sustain discharge is performed only at the portion defined by the upper partition 208, the fluorescent substance by the charged particles, which is a problem of the conventional plasma display panel, 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.

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, visible light emitted from the discharge cell passes through the front substrate. Since sustain electrodes and scan electrodes do not exist in the part of the front substrate where the visible light passes, the aperture ratio can be significantly improved, and the transmittance is improved. do.

Second, since the surface discharge can be generated from all sides forming the discharge space, the discharge surface can be greatly enlarged.

Third, 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 to the conventional one, so that the entire discharge cell can be efficiently used.

Fifth, the plasma can be concentrated in the center of the discharge space. The discharge occurs at the side of the discharge cell and diffuses to the center of the discharge cell, thereby concentrating the plasma to the center of the discharge cell, and the plasma is discharged under the influence of an electric field applied to the discharge electrode formed at the side By having a tendency to gather at the center of the cell, it is possible to utilize space charge for discharge.

Sixth, since it has the same effect as described above, it is possible to drive even at a low voltage can significantly improve the luminous efficiency.

Seventh, 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. .

Eighth, the discharge response speed is fast and low voltage driving is possible. In the plasma display panel and the flat panel display device having the same according to the present invention, since the discharge electrode is not disposed on the front substrate through which visible light is transmitted, the discharge electrode is disposed on the side of the discharge space. Therefore, it is necessary to use a transparent electrode having high resistance as the discharge electrode. Since a low resistance electrode, such as a metal electrode, can be used as the discharge electrode, the discharge response speed is high, and low voltage driving is possible without distortion of the waveform.

Ninth, since the groove formed on the front substrate functions as an exhaust passage of the plasma display panel, the impurity gas generated during the sealing process of the plasma display panel can be smoothly exhausted to the outside. Therefore, the problem of the discharge failure of the plasma display panel by the impurity gas is reduced.

Tenth, when the first and second floating electrodes are disposed in the plasma display panel, the discharge generation portion is increased, so that the discharge start voltage is reduced and the discharge efficiency is improved.

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 cross-sectional view taken along the line VII-VII of FIG. 3,

5 is a modified example of the plasma display panel according to an embodiment of the present invention;

6 is another modified example of the plasma display panel according to the exemplary embodiment of the present invention.

Explanation of symbols on main parts of drawing

200: plasma display panel

201: Front board 202: Back board

203: address electrode 204: dielectric layer

205: lower partition 206: lower sustain electrode

207: upper sustain electrode 208: upper partition

209: MgO film 210: phosphor layer

215: first floating electrode 217: second floating electrode

220: light emitting cell 229: MgO film

235 groove

Claims (9)

Transparent front substrate; A rear substrate disposed in parallel with the front substrate; An upper partition wall disposed between the front substrate and the rear substrate and partitioning the light emitting cells and formed of a dielectric; An upper sustain electrode, a lower sustain electrode, and a first floating electrode disposed in an upper partition wall to surround the light emitting cell; A lower partition wall disposed between the upper partition wall and the rear substrate; A phosphor layer disposed in a space defined by the lower partition wall; And A discharge gas in the light emitting cell; And at least one groove extending in one direction on a front substrate facing the light emitting cells. The method of claim 1, The upper sustain electrode, the lower sustain electrode and the first floating electrode extend in one direction parallel to each other, And an address electrode extending to intersect the upper sustain electrode, the lower sustain electrode, and the first floating electrode. The method of claim 2, And side surfaces of the upper partition wall are covered by an MgO layer, the address electrodes are disposed between the rear substrate and the phosphor layer, and a dielectric layer is formed between the address electrodes and the phosphor layer. The method of claim 1, And the first floating electrode extends in one direction in parallel between the upper sustain electrode and the lower sustain electrode. The method of claim 1, And at least one second floating electrode arranged to extend in one direction in the front substrate. The method of claim 1, And the upper sustain electrode and the lower sustain electrode are arranged in a vertical direction. The method of claim 6, And an upper sustain electrode serving as a common electrode and a lower sustain electrode serving as a scan electrode. The method of claim 1, And a lower surface of the front substrate is covered by an MgO film. The method of claim 1, And the upper partition and the lower partition are integrally formed.