KR100708703B1 - Plasma display apparatus - Google Patents

Abstract

A front substrate and a rear substrate which are disposed to face each other, and a surface of the rear substrate facing the front substrate, the partition wall defining a discharge cell, and extending across the discharge cell; An address electrode embedded in the discharge cell, a phosphor layer disposed in the discharge cell to emit visible light for displaying an image, and a discharge gas filled in the discharge cell and capable of emitting ultraviolet light to emit visible light from the phosphor layer. And a first dielectric layer extending across the discharge cell and covering the X and Y electrodes to induce wall charge, and covering the X and Y electrodes, and protecting the X and Y electrodes. A black part disposed between the front substrate and the sustain electrode pair to reduce external light reflection, and the X electrode is moved from one side to the other side of the front substrate; On the other side of the front substrate, the X electrode portion is formed higher than the region extending to the other side, the Y electrode extends from one side of the other side of the front substrate, the Y electrode portion on the other side of the front substrate extends to one side The present invention provides a plasma display panel and a plasma display apparatus having the same, wherein the plasma display panel is formed to be higher than the region.

Description

Plasma display apparatus

1 is a view showing the structure of a discharge cell provided in a conventional plasma display panel.

2 is a view showing a conventional plasma display panel.

3 is a cross-sectional view of a plasma display panel according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a partial region of the plasma display panel illustrated in FIG. 3.

FIG. 5 is a diagram illustrating a part of the plasma display panel shown in FIG. 3.

6 is a view showing a plasma display device having a plasma display panel according to the present invention.

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

300 ... plasma display panel 310 ... front panel

322 ... X electrode 324 ... Y electrode

325 ... black 330 ... first dielectric layer

340 ... Protective layer 350 ... Bulk

360 ... back board

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel. More particularly, the plasma display panel has an improved electrode structure in which thicknesses of the X electrode and the Y electrode are formed in a predetermined range, thereby reducing defects caused by dropping of the electrode. It relates to a display panel.

Typically, a plasma display panel injects and discharges a discharge gas on two substrates having a plurality of electrodes, and then applies a discharge voltage. When the gas emits light between the electrodes due to the discharge voltage, an appropriate pulse voltage is applied. It refers to a flat panel display that is applied to address a point where two electrodes intersect to implement a desired number, letter or graphic.

The plasma display panel may be classified into a direct current type and an alternating current type according to a type of driving voltage applied to a discharge cell, for example, a discharge type, and may be classified into a counter discharge type and a surface discharge type according to the configuration of the electrodes.

The DC plasma display panel has a structure in which all electrodes are exposed to a discharge space, and charges are directly transferred between corresponding electrodes. On the other hand, in the AC plasma display panel, at least one electrode is embedded in the dielectric layer, and instead of direct charge transfer between the corresponding electrodes, the ions and electrons generated by the discharge adhere to the surface of the dielectric layer to form a wall. It is possible to form a wall voltage and to maintain discharge by a sustaining voltage.

On the other hand, in the opposite discharge type plasma display panel, an address electrode and a scan electrode are provided to face each unit pixel, and addressing discharge and sustain discharge are generated between the two electrodes. On the other hand, in the surface discharge plasma display panel, an address electrode and a sustain electrode corresponding to each unit pixel are provided to generate addressing discharge and sustain discharge.

1 illustrates a cross-sectional structure of a unit cell of a conventional plasma display panel 10.

Referring to the drawing, in the plasma display panel 10, a pair of sustain electrodes 12 having a predetermined width and height are formed on the same surface of the front substrate 11, and on the sustain electrodes 12, a first dielectric layer ( 13 is formed, and a protective film layer 14 is formed on the first dielectric layer 13.

An address electrode 16 having a predetermined width and height is formed on the back substrate 15 disposed to face the front substrate 11, and a second dielectric layer 17 is formed to bury the address electrode 16. .

The partition wall 18 is formed on the second dielectric layer 17 to prevent crosstalk between adjacent discharge cells. The barrier rib 18 is formed on the upper surface of the second dielectric layer 17 and the inner wall of the partition wall 18. Green and blue phosphor layers 19 may be formed.

On the other hand, the inner space of the front and rear substrates (11, 15) is formed to have a discharge region 100 by encapsulating an inert gas.

The operation of the plasma display panel 10 having the above structure will be briefly described as follows.

When a driving voltage is applied to the sustain electrode 12, surface discharge occurs in the discharge region 100 on the surfaces of the first dielectric layer 13 and the passivation layer 14 to generate ultraviolet rays U. Color display is performed as the fluorescent material of the surrounding phosphor layer 19 is excited by the generated ultraviolet rays.

That is, space charges in the discharge cell are accelerated by the driving voltage applied thereto, and are mainly composed of neon (Ne), an inert mixed gas filled with a pressure of about 400 to 500 Torr in the discharge cell. It collides with the phening mixed gas to which helium (He) and xenon (Xe) gas are added.

Accordingly, 147 nanometers of ultraviolet rays are generated while the inert gas is excited. The generated ultraviolet rays generate visible light as they collide with the fluorescent material of the phosphor layer 19 surrounding the address electrode 16 and the partition wall 18.

2 illustrates a plasma display panel 20 according to a conventional example.

Referring to the drawings, the plasma display panel 20 includes a front substrate 21 and a rear substrate 210.

On the lower surface of the front substrate 21, a common electrode 22 and a scanning electrode 23 are formed in a strip form and are alternately arranged. Bus electrodes 24 are formed along one edge of the common and scan electrodes 22 and 23.

The common and scan electrodes and the bus electrodes 22 to 24 are embedded by the first dielectric layer 25, and the protective layer 26 is coated on the surface of the first dielectric layer 25.

An address electrode 220 is formed on an upper surface of the back substrate 210, and the address electrode 220 is buried by the second dielectric layer 230.

On the upper surface of the second dielectric layer 230, a partition wall 240 for dividing the discharge space is disposed. Red, green, and blue phosphor layers 250 are applied to the surface of the second dielectric layer 230 and the inner wall of the partition wall 240.

Although not shown in the drawing, the conventional plasma display panel 20 includes a black portion which reduces the reflection of external light between the front substrate 21, the common electrode 22, and the scan electrode 23 to secure a clear room contrast. Black Stripe) may be provided.

Referring to FIG. 5, when the front substrate 510 is divided into regions, a display region A for forming an image by forming pixels and a non-display region B electrically connected to an external terminal to transmit an electrical signal are provided. Can be divided into (C).

The above-described black part may be stacked between the X electrode 522 and the Y electrode 524 and the front substrate 510 in the display area A. FIG.

In the conventional electrodes 522 and 524, the thickness of the electrode in the display area A and the thickness of the electrode in the non-display area B and C are the same, so that the thickness of the display area including the black portion is greater than that of the non-display area. It becomes thicker and there is a substantial step.

However, the thickness of the electrode in the non-display area (B) (C) becomes thin during the exposure and development process that proceeds after the formation of the electrodes 522, 524, so that the electrodes are formed at both ends of the electrodes 522, 524. There was a problem to increase the manufacturing failure rate is lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the process defects are formed so that the thickness of the electrode in the display area formed on the substrate and the thickness of the electrode including the thickness of the black part in the non-display area are in a predetermined range. It is an object of the present invention to provide a plasma display panel having an improved electrode structure.

In order to achieve the above or other objects, the present invention provides a front substrate and a rear substrate which are disposed to face each other, and a partition wall provided on a surface of the rear substrate facing the front substrate and partitioning a discharge cell; An address electrode formed to extend across the discharge cell and embedded in a lower surface of the discharge cell, a phosphor layer disposed in the discharge cell to emit visible light for displaying an image, and filled in the discharge cell; A discharge gas capable of emitting ultraviolet rays to emit visible light in the phosphor layer, and is provided to extend across the discharge cells, covering the X electrode and the Y electrode for inducing wall charge, and covering the X electrode and the Y electrode. And a black portion disposed between the first dielectric layer protecting the X electrode and the Y electrode and the front substrate and the sustain electrode pair to reduce external light reflection. In contrast, the X electrode extends from one side of the front substrate to the other side, and on one side of the front substrate, the X electrode portion is formed higher than the region extending to the other side, and the Y electrode is moved from the other side of the front substrate to one side. It is extended, and the Y electrode portion on the other side of the front substrate is provided higher than the region extending to one side provides a plasma display panel.

In addition, the black portion may be characterized in that the conductive material capable of electrical conduction.

In addition, the X electrode and the Y electrode are integrally connected to a plurality of display area X electrode and Y electrode parts and the display area X electrode part and the Y electrode part disposed in a display area for implementing a screen. The present invention provides a plasma display panel comprising a non-display area X electrode part and a Y electrode part which are disposed on the substrate and serve as terminals, and are formed thicker than the display area X electrode part and the Y electrode part.

According to another feature of the present invention, the black portion may have a thickness that is not higher than the thickness of the non-display region X electrode portion and the Y electrode portion in addition to the thickness of the display region X electrode portion and the Y electrode portion. .

On the other hand, according to the present invention, it is characterized in that it further comprises a second dielectric layer provided on the surface facing the front substrate of the rear substrate to cover the address electrode.

Finally, according to another feature of the present invention, there is provided a plasma display device comprising the plasma display panel.

 Hereinafter, a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 4 is a view showing a part of the plasma display panel of FIG. 3. For convenience of explanation, FIG. 3 illustrates the front substrate 310, the X electrode 322, the Y electrode 324, the black portion 325, the first dielectric layer 330, and the passivation layer 340. It is a figure rotated.

Referring to the drawing, the plasma display panel 300 is provided with a front substrate 310 and a rear substrate 360 disposed to face the front substrate 310.

At this time, the front substrate 310 is generally formed of a transparent material such as glass as the main material.

 The X electrode 322 is disposed on a surface of the front substrate 310 facing the rear substrate 360. The X electrode 322 is formed in the shape of a stripe. The Y electrodes 324 are spaced at predetermined intervals between the X electrodes 322, which also have a stripe shape.

In the present embodiment, the X electrode 322 and the Y electrode 324 are disposed on the surface of the front substrate 310 facing the rear substrate 360, but the X electrode 322 and the Y electrode 324 are provided. The location is not limited to this. For example, the front substrate 310 may be spaced apart from the surface facing the rear substrate 360 at predetermined intervals.

However, the X electrode 322 and the Y electrode 324 may be disposed at the same position from the front substrate 310 toward the rear substrate 360.

 Although not shown in the drawings, the front substrate 310 and the X electrode 322 and the Y electrode 324 may be provided in the form of a thin film as a transparent conductive material.

The transparent thin film is a conductive material capable of causing electric discharge and is formed of a transparent material within a range that does not prevent the visible light emitted from the phosphor layer to be described later from being emitted to the front substrate 310. (indium tin oxide).

Using the transparent conductive material, a thin film is formed on the surface of the front substrate 310 facing the rear substrate 360 in a predetermined pattern by a method such as sputtering.

However, a transparent conductive material such as ITO generally has a high surface resistance, and thus, when the sustain electrode is formed only by the transparent electrode, a large voltage drop applied to both ends of the transparent electrode consumes a lot of driving power and slows down the response speed. In order to improve this, the X electrode 322 and the Y electrode 324 are used as a bus electrode formed of a narrow line width using a metal material on a transparent thin film.

The X electrode 322 and the Y electrode 324 may be formed in a single layer structure using a metal such as Ag, Al, or Cu, but may be formed to have a multilayer structure such as Cr / Al / Cr.

Meanwhile, a black portion 325 is stacked between the front substrate 310 and the X electrode 322 and the Y electrode 324 in order to reduce reflection of external light in order to secure bright room contrast.

The black part 325 may employ any material within a range of absorbing light or having low reflectivity, but preferably, a conductive material called CBS (Conductive black stripe) may be used. The black portion 325 will be described later in more detail.

In addition, although not shown in the drawing, in addition to the black portion 325 described above, the rear substrate 360 of the front substrate 310 is directed between the X electrode 322 and the Y electrode 324 in order to improve the contrast. As a material that absorbs light on the surface or has low reflectivity, B / S (Black Stripe) may be formed as a thin film.

Meanwhile, the first dielectric layer 330 is formed on the front substrate 310 such that the X electrode 322 and the Y electrode 324 are embedded. The first dielectric layer 330 induces charge, while directly conducting electricity between adjacent electrodes 322 and 324 during discharge and preventing damaging the electrodes 322 and 324 by directly impacting cations or electrons on the electrodes 322 and 324. It is formed of a dielectric material capable of accumulating wall charges. Such dielectrics include PbO, B ₂ O ₃ , and SiO ₂ .

On the other hand, on the surface of the rear substrate 360 facing the front substrate 310, the address electrodes 354 intersect the X electrodes 322 and the Y electrodes 324 in the discharge cells 342.

The address electrodes 354 are intended to cause an address discharge to facilitate sustain-discharge between the X electrode 322 and the Y electrode 324. More specifically, the address electrodes 354 lower the voltage for sustain-discharge. Play a role. Here, the address discharge is a discharge that occurs between the Y electrode 324 and the address electrode 354.

The space formed by the pair of X electrodes 322 and Y electrodes 324 and the address electrodes 354 intersected with each other thus form one discharge unit as the unit discharge cells 342.

In addition, the address electrode 354 is preferably provided to be perpendicular to the X electrode and the Y electrode (322,324).

Meanwhile, the passivation layer 340 is formed to cover the first dielectric layer 330. The passivation layer 340 prevents cations and electrons from colliding with the first dielectric layer 330 and causing damage to the first dielectric layer 330 during discharge.

In addition, the protective layer 340 emits a large amount of secondary electrons during discharge, thereby smoothly plasma discharge.

The protective layer 340 having such a function is formed using a material having a high secondary electron emission coefficient and a high visible light transmittance.

As the passivation layer 340, a material including magnesium oxide (MgO) is formed on the first dielectric layer 330 as a thin film. The protective layer 340 is mainly formed by sputtering or electron beam deposition after most processes are completed.

The second dielectric layer 352 may be coated to fill the address electrode 354 formed on the top surface of the back substrate 360. The second dielectric layer 352 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the address electrode 354 during discharge and damaging the address electrode 354. Such dielectrics include PbO and B ₂ O 3, SiO ₂ and the like.

Red, green, and blue light emitting phosphor layers 344 are provided on the entire surface of the second dielectric layer 352 between the partition walls 350 that partition the discharge cells 342. In addition, red, green, and blue light emitting phosphor layers 344 corresponding to each discharge cell are formed on the side surfaces of the barrier rib 350.

The phosphor layer 344 has a component for generating visible light by receiving ultraviolet rays. The red light emitting phosphor layer formed in the red discharge cell includes a phosphor such as Y (V, P) O ₄ : Eu, and the green discharge cell. The red light emitting phosphor layer formed on the substrate includes a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue light emitting phosphor layer formed on the blue discharge cell includes a phosphor such as BAM: Eu.

In addition, the discharge cells 342 are filled with a discharge gas in which neon (Ne), xenon (Xe), and the like are mixed, and in the state where the discharge gas is filled as described above, the front substrates and rear substrates 310 and 360 facing each other. Both substrates 310 and 360 are sealed to each other and joined to each other by a sealing member such as frit glass formed at the edge of the substrate.

Meanwhile, FIG. 5 is a view of the front substrate 310 of the plasma display panel illustrated in FIG. 3 as viewed from the rear substrate 360. Of course, in FIG. 3, the front substrate 310, the X electrode 322, the Y electrode 324, the black portion 325, the first dielectric layer 330, and the passivation layer 340 may be disposed in the transverse direction for convenience of description. Although FIG. 5 rotates, FIG. 5 is a view considering a state of not rotating 90 degrees in FIG. 3.

Referring to FIG. 5, the front substrate 510 is provided, and when the front substrate 510 is divided into regions, a display area A for forming an image to form an image and an electrical signal are electrically connected to an external terminal. Can be divided into a non-display area (B) and (C).

Such a display area A and a non-display area B and C can also be seen in FIG.

In addition, in the drawing, only the X electrode 522 and the Y electrode 524 can be seen, but the first dielectric layer 330 and the like are omitted.

Here, the X electrode 522 and the Y electrode 524 may include a plurality of display electrode X electrode portions and Y electrode portions (areas between the two dotted lines in FIG. 5) disposed in the display region A for implementing a screen. It is composed of a non-display area X electrode part and a Y electrode part which are integrally connected to each of the display area X electrode part and the Y electrode part and disposed in the non-display area (B) (C) to serve as terminals.

In addition, the X electrode portion and the Y electrode portion for the non-display area may be connected to the X electrode portion and the Y electrode portion for the display area integrally, and may not only have a shape extending in a straight line as shown in the drawing, but also other. It may be formed in various patterns.

Meanwhile, although not shown in the drawing, a black portion is provided between the X electrode portion and the Y electrode portion for the display area and the front substrate 510. The black portion is preferably formed in the display area A. FIG. However, the description of the black portion is the same or similar to that described above, and will be omitted.

Referring back to FIG. 4, the front substrate 310, the black portion 325, the X electrodes and the Y electrodes 322 and 324, the first dielectric 330, and the protective layer 340 are sequentially stacked as described above. . Here, the thicknesses of the black portions 325, the X electrodes and the Y electrodes 322, 324 will be described in detail.

In the display area A, a black portion 325 is stacked between the front substrate 310 and the X electrode 322. The thickness of the black portion 325 is D1, and the thickness of the X electrode portion for the display region is set to D1. It is represented by D2. Of course, the black portion 324 is also provided in the display area A in the Y electrode 324. However, the same or similar description to the description of the X electrode 322 will be described as the X electrode.

On the other hand, the thickness of the non-display area X electrode portion is set to D3.

Here, in view of the relationship between D1, D2, and D3, D3 is formed thicker than D2.

In other words, D1 and D2 are added to form not thicker than D3, and preferably the same.

Referring again to FIG. 3, in the plasma display panel 300, a plurality of discharge cells 342 are partitioned by the partition wall 350 between the front substrate 310 and the rear substrate 360 facing each other.

The partition wall 350 performs a function of preventing optical crosstalk between the discharge cells 342. In the present embodiment, the partition wall 350 partitions the discharge cells 342 having cross-sections having a rectangular shape.

However, the partition wall 350 may be configured to have a cross section of various patterns as long as a plurality of discharge spaces can be formed. For example, the open barrier ribs such as the shape of the stripe may be used as well as the closed barrier ribs such as the waffle, the matrix, the delta, and the like.

In addition, the closed partition wall, the cross section of the discharge space may be formed in a polygon, such as a triangle, a square, a pentagon, or a circular, elliptical shape or the like.

Meanwhile, the plasma display apparatus 600 including the plasma display panel 650 according to the exemplary embodiment of the present invention is illustrated in FIG. 6. Naturally, in the present embodiment, all of the plasma display panels according to the above-described embodiments may be applied. However, for convenience of explanation, the plasma display panel according to an exemplary embodiment will be described.

Referring to the drawing, the plasma display apparatus 600 includes a plasma display panel 650, a chassis base 620, and a driving circuit board 640.

The plasma display panel 650 includes a front substrate 651 and a rear substrate 652 bonded to each other.

The plasma display panel in this embodiment may include the plasma display panel in the above-described embodiment. Briefly, a plurality of discharge cells are partitioned by partition walls between the front substrate and the rear substrate.

In addition, in the present embodiment, the partition partitions discharge cells having rectangular cross-sections, but the partition may be formed of various patterns of partitions as long as it can form a plurality of discharge spaces. Omit.

In addition, the description of the closed partition is omitted as described above.

On the other hand, a plurality of X electrodes and Y electrodes are arranged on the front substrate, as described above will be omitted. In addition, a black portion is provided between the front substrate and the X electrode and the Y electrode, and the description thereof is omitted as described above.

On the other hand, the first dielectric layer may be formed on the front substrate so that the X electrode and the Y electrode is embedded, the description thereof will be omitted as described above.

On the other hand, the protective film layer may be formed to cover the first dielectric layer, the description thereof will be omitted as described above. In the above, the reference numerals of the main parts are omitted.

On the other hand, on the surface of the rear substrate 652 facing the front substrate 651, address electrodes crossing the X electrode and the Y electrode in the discharge cell are arranged. However, the description of the shape and structure of the address electrode is omitted as described above.

In addition, a second dielectric layer may be applied to fill the address electrode formed on the surface of the rear substrate 652 facing the front substrate 651, and the description thereof will be omitted as described above.

In addition, red, green, and blue light emitting phosphor layers are provided on a surface of the second dielectric layer facing the front substrate 651 between the partition walls that partition the discharge cells. Description thereof will be omitted as described above.

In addition, a gas such as neon gas is injected into the discharge cell space. Inside the substrates 651 and 652, ultraviolet rays are emitted by a voltage that causes gas discharge.

The plasma display panel 650 having such a structure displays an image by emitting a phosphor by ultraviolet rays generated while the gas discharged at the time of glow discharge by the voltage applied to the electrode in the cell space. ),

The chassis base 620 is attached to the rear surface of the plasma display panel 650. The chassis base 620 preferably has a predetermined rigidity in order to support the plasma display panel 650.

In addition, the chassis base 620 may receive heat generated by the plasma display panel 650 and emit the heat to the outside.

Therefore, the chassis base 620 is preferably made of a material such as aluminum. The chassis base 620 is bonded to the plasma display panel 650 by an adhesive part 654 such as a double-sided tape.

 A portion where the adhesive part 654 is not located between the plasma display panel 650 and the chassis base 620 in order to smoothly transfer and generate heat generated in the plasma display panel 650 to the chassis base 620. Is arranged so that the heat radiation sheet 653 is located.

A predetermined number of driving circuit boards 40 including circuits for driving the plasma display panel 50, and a predetermined number of driving circuit boards 640 for driving the plasma display panel 650 on the rear surface of the chassis base 620. ) Is arranged and installed.

In the above described the present invention with reference to the specific embodiment shown in the drawings, but this is only an example, those of ordinary skill in the art to which the present invention pertains various modifications and variations therefrom.

Therefore, the protection scope of the present invention should be interpreted by the claims to be described later, and all the technical ideas within the equivalent and equivalent ranges should be construed as being included in the protection scope of the present invention.

Plasma display panel according to the present invention has the effect of forming the thickness of the electrode on the front substrate to be within a predetermined range to reduce the process defects to improve the productivity of manufacturing.

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 (6)

A front substrate and a rear substrate disposed to face each other; Barrier ribs provided on a surface of the rear substrate facing the front substrate to partition discharge cells; An address electrode extending across the discharge cell and embedded in a lower surface of the discharge cell; A phosphor layer disposed in the discharge cell to emit visible light for displaying an image; A discharge gas filled in the discharge cell and capable of emitting ultraviolet rays to emit visible light in the phosphor layer;  An X electrode and a Y electrode extending across the discharge cell and inducing wall charge; A first dielectric layer formed to cover the X electrode and the Y electrode and protecting the X electrode and the Y electrode; And A black part disposed between the front substrate and the sustain electrode pair to reduce reflection of external light; The X electrode extends from one side of the front substrate to the other side, and the X electrode portion is formed higher than the region extending to the other side on one side of the front substrate, And the Y electrode extends from the other side of the front substrate to one side, and the Y electrode part is formed higher than the area extending from the one side to the other side of the front substrate. The method of claim 1, And the black portion is a conductive material capable of conducting electricity. The method of claim 1, The X electrode and the Y electrode are integrally connected to a plurality of display area X electrode parts and Y electrode parts disposed in the display area implementing the screen, and integrally connected to the display area X electrode part and the Y electrode part and disposed in the non-display area. And serve as a terminal, the plasma display panel comprising a non-display area X electrode part and a Y electrode part formed thicker than the display area X electrode part and the Y electrode part. The method of claim 1, And the black portion has a thickness not higher than that of the non-display region X electrode portion and the Y electrode portion in addition to the thicknesses of the display region X electrode portion and the Y electrode portion. The method of claim 1, And a second dielectric layer provided on a surface of the rear substrate facing the front substrate so as to cover the address electrode. A plasma display device comprising the plasma display panel of claim 1.

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