KR100708698B1 - Plasma display panel - Google Patents

Abstract

The present invention provides a plasma display panel including a plurality of discharge cells between a first panel and a second panel facing each other in parallel, wherein the first panel is disposed on a first substrate and the first substrate. An X electrode and a Y electrode extending in parallel to each other in one direction, and a first dielectric layer formed to cover the X electrode and the Y electrode, wherein the first dielectric layer is formed at a portion corresponding to each of the plurality of discharge cells. The electric field concentrator having a groove shape, wherein the electric field concentrator has a shape of a vertical cut surface in which the electric field concentrator is perpendicular to an extension direction of the X electrode and the Y electrode. When the second panel side is viewed to be downward, the lower side surface portion of the electric field concentrating portion is formed to have a curved shape having a predetermined curvature. It provides a lightning display panel.

Plasma Display Panel, Field Concentrator, Corner, Curved Shape

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view of a plasma display panel.

FIG. 2 is a diagram illustrating a structure of a discharge cell included in the plasma display panel as shown in FIG. 1.

3 is a diagram illustrating a structure of a discharge cell having an electric field concentration unit.

4A and 4B show in detail a first panel of a plasma display panel having an electric field concentrator having angled edge portions.

FIG. 5 is a diagram illustrating in detail a first panel of a plasma display panel including an electric field concentrator having a curved shape according to a preferred embodiment of the present invention.

6 is a view showing the structure of a discharge cell provided in the plasma display panel according to an embodiment of the present invention.

<Description of Reference Number in Drawing>

102, 202, 302, 402, 502, 602: first substrate

104, 204, 304, 604: second substrate

106, 206, 306, 606: bulkhead

108, 208, 308, 608: phosphor layer

109a, 209a, 309a, 409a, 509a, 609a: first dielectric layer

109b, 209b, 309b, and 609b: second dielectric layer

110, 210, 310, 410, 510, 610: protective film

112a, 212a, 312a, 412a, 512a, and 612a: transparent electrode on the X electrode side

112b, 212b, 312b, 412b, 512b, and 612b: bus electrodes on the X electrode side

112, 212, 312, 412, 512, 612: X electrode

114a, 214a, 314a, 414a, 514a, 614a: transparent electrode on the Y electrode side

114b, 214b, 314b, 414b, 514b, and 614b: bus electrodes on the Y electrode side

114, 214, 314, 414, 514, 614: Y electrode

116, 216, 316, 616: A electrode

320, 420, 520, 620: Field Concentrator

421: corner (or bottom side)

The present invention relates to a plasma display panel. More particularly, the present invention relates to a plasma display panel having an electric field concentrator having a curved shape instead of an angled corner shape in order to prevent discharge nonuniformity and breakage of the dielectric layer.

Among the display apparatuses, there is a plasma display apparatus having a plasma display panel, which has recently attracted particular attention as a large flat panel display apparatus. Plasma display device is a process of encapsulating a discharge gas between the two substrates of the plasma display panel having a plurality of electrodes and applying a discharge voltage to generate a vacuum ultraviolet light by the discharge, and exciting the phosphor formed by the vacuum ultraviolet light in a predetermined pattern A device that displays a desired image using visible light generated by the.

1 is an exploded perspective view of a plasma display panel.

A plasma display panel comprising a first panel and a second panel, wherein the first panel includes an X electrode (common electrode) 112 having a first substrate 102, a transparent electrode 112a, and a bus electrode 112b. A Y electrode (scanning electrode 114) including a transparent electrode 114a and a bus electrode 114b, a first dielectric layer 109a, a protective film 110, and the like are provided. The second panel 104 includes a second substrate 104, An A electrode (address electrode) 116, a second dielectric layer 109b, a partition wall 106, a phosphor layer 108, and the like are provided. The first substrate 102 and the second substrate 104 are spaced apart from each other to face each other in parallel, and the space between the two substrates is partitioned by the partition wall 106 to form a discharge cell as a unit discharge space that causes discharge. In the discharge cell, the panel capacitance is formed by a dielectric provided in the discharge cell. The discharge cell may be equivalently modeled as a panel capacitor in which the panel capacitance and the electrode surrounding the discharge cell are combined.

FIG. 2 is a diagram illustrating a structure of a discharge cell included in the plasma display panel as shown in FIG. 1.

The first substrate 202, the second substrate 204, the partition 206, the phosphor layer 208, the first dielectric layer 209a, the second dielectric layer 209b, the protective film 210, and the X shown in FIG. The electrodes 212, 212a, 212b, the Y electrodes 214, 214a, 214b, and the A electrode 216 are formed of the first substrate 102, the second substrate 104, the partition 106, and the phosphor shown in FIG. The layer 108, the first dielectric layer 109a, the second dielectric layer 109b, the passivation layer 110, the X electrodes 112, 112a, 112b, the Y electrodes 114, 114a, 114b, and the A electrode 116. Respectively.

When a driving voltage is applied to each of the discharge spaces in the discharge cell through the electrodes 212 and 214, vacuum ultraviolet rays (VUVs) generated by plasma discharge are generated in accordance with the driving voltages applied to the discharge spaces, and the generated vacuum ultraviolet rays are generated. The silver excites the phosphor layer 208 to emit visible light, which is transmitted through the first panel to provide a visual stimulus to the viewer of the plasma display panel.

3 is a diagram illustrating a structure of a discharge cell having an electric field concentration unit.

The first substrate 302, the second substrate 304, the partition wall 306, the phosphor layer 308, the first dielectric layer 309a, the second dielectric layer 309b, the protective film 310, and the X electrode in FIG. 3. 312, 312a, and 312b, the Y electrodes 314, 314a, and 314b and the A electrode 316 are formed of the first substrate 202, the second substrate 204, the partition wall 206, and the phosphor layer (FIG. 2). 208, the first dielectric layer 209a, the second dielectric layer 209b, the protective film 210, the X electrodes 212, 212a, 212b, the Y electrodes 214, 214a, and 214b and the A electrode 216. . However, in FIG. 3, unlike FIG. 2, there is a difference in that the electric field concentrator 320 is further provided.

As shown in FIG. 3, when the first dielectric layer 309a is provided with a groove-shaped electric field concentrator 320, the groove-shaped space may be formed even if the distance between the X electrode 312 and the Y electrode 314 is increased. Because of the effect that the electric field is concentrated, it is not necessary to increase the driving voltage to be applied, and at the same time, the discharge space can be widely used as the distance between the X electrode 312 and the Y electrode 314 can be widened, thereby improving luminous efficiency. You can do it. In addition, as the first dielectric layer 309a is etched, the first panel transmittance of visible light emitted from the discharge cell is improved.

Korean Patent No. 0322071 discloses a plasma display panel having an electric field concentrator having such an effect in detail.

However, as shown in FIG. 3, when the groove-type electric field concentrator has an angled corner portion (the lower side of the side surface of 320 in FIG. 3), an unintended electric field tendency occurs in the corner portion due to the formation of an irregular electric field. May appear and the discharge may become unstable. Such an electric field deflection may reduce the uniformity of the discharge and impair the stability of the discharge, and may also cause breakage of the dielectric layer corresponding to the corner portion.

In order to solve the above problems, an object of the present invention is to provide a plasma display panel having an electric field concentrator having a curved shape instead of an angled corner shape in order to prevent the discharge nonuniformity and breakage of the dielectric layer.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plasma display panel including a plurality of discharge cells between a first panel and a second panel that face each other in parallel, wherein the first panel comprises: a first substrate; An X electrode and a Y electrode disposed on a first substrate and extending in parallel to each other in one direction, and having a first dielectric layer formed to cover the X electrode and the Y electrode, wherein the first dielectric layer comprises: the plurality of discharges; A groove concentrating electric field concentrator is provided at a portion corresponding to each cell, and the electric field concentrator has a shape of a vertical cut surface obtained by cutting the electric field concentrator so as to be perpendicular to an extension direction of the X electrode and the Y electrode. When looking at the first panel side up and the second panel side down, the lower end of the side surface of the electric field concentrating part becomes a curved shape having a predetermined curvature. Provides a plasma display panel characterized in that the sex.

In the present invention, the curved shape may be characterized in that the convex shape toward the central portion of the discharge cell.

In the present invention, the electric field concentrator may be formed to be parallel to the extending direction of the X electrode and the extending direction of the Y electrode between the X electrode and the Y electrode.

In the present invention, the electric field concentrator may be formed to be symmetrical with respect to the center of the electric field concentrator in the shape of the vertical cut surface.

In the present invention, the electric field concentrator having the curved shape may be formed using a screen-printing method.

In the present invention, the electric field concentrator having the curved shape may be formed using a photo-sensitive method.

In the present invention, the electric field concentrator having the curved shape may be formed using a sand-blast method.

In addition, the present invention, the first substrate and the second substrate spaced apart from each other in parallel to each other; A partition wall partitioning a space between the first substrate and the second substrate to form a plurality of discharge cells; An X electrode and a Y electrode disposed on the first substrate and extending in parallel in one direction; The electric field concentrator is formed to cover the X electrode and the Y electrode and has a groove shape in a portion corresponding to each of the plurality of discharge cells, and the electric field concentrator extends in the X electrode and the Y electrode. When looking at the shape of the vertical cut surface cut to be perpendicular to the first substrate side up and the second substrate side down, the lower end of the side portion of the electric field concentrator is formed to have a curved shape having a predetermined curvature A first dielectric layer; An A electrode disposed on the second substrate and extending in a direction crossing the extension direction of the X electrode; A second dielectric layer formed to cover the A electrode; A phosphor layer disposed in the discharge cell; And a discharge gas filled in the discharge space in the discharge cell.

In the present invention, the curved shape may be characterized in that the convex shape toward the central portion of the discharge cell.

In the present invention, the plasma display panel may further include a protective film for protecting the first dielectric layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related well-known configuration or function may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

4A and 4B show in detail a first panel of a plasma display panel having an electric field concentrator having angled edge portions.

The first substrate 402, the first dielectric layer 409a, the protective film 410, the X electrodes 412, 412a, 412b, and the Y electrodes 414, 414a, 414b in FIGS. 4A and 4B are shown in FIG. The first substrate 302, the first dielectric layer 309a, the passivation layer 310, the X electrodes 312, 312a and 312b, and the Y electrodes 314, 314a and 314b are respectively corresponded.

FIG. 4A illustrates a case in which the shape of the vertical cut surface obtained by cutting the electric field concentrator 420 perpendicular to the extending directions of the X electrode 412 and the Y electrode 414 becomes a rectangular shape, and FIG. 4B shows the electric field concentrator. The case where the shape of the vertical cut surface which cut | disconnected 420 perpendicular to the extending direction of the X electrode 412 and the Y electrode 414 becomes a trapezoidal shape is shown.

4A and 4B, it can be seen that the lower end portion 421 of the electric field concentrator 420 is formed in an angled corner shape. As described above, when the groove-type electric field concentrator 420 has an angled corner portion, an unintended electric field tends to appear at the corner portion 421 due to the formation of an irregular electric field, resulting in unstable discharge. Can be. This phenomenon of electric field may reduce the uniformity of the discharge to impair the stability of the discharge and may also cause breakage of the dielectric layer corresponding to the corner portion 421. That is, the formation of an irregular electric field occurs due to the presence of the corner portion 421, and the formation of such an irregular electric field has a very sensitive effect on the discharge between the X electrode 412 and the Y electrode 414, thereby ensuring stability of the discharge. Will hurt. In addition, the dielectric material constituting the first dielectric layer 409a has a constant limit withstand voltage (maximum voltage capable of maintaining insulation). When an electric field is concentrated in the corner portion 421, the dielectric layer corresponding to the corner portion 421 is formed. In some cases, the dielectric material is exposed to a voltage above the limiting withstand voltage that it can withstand and is at risk of breakage.

In order to solve this problem, the present invention intends to form a corner portion 421 of the electric field concentrator 420 in a curved shape having a predetermined curvature.

FIG. 5 is a diagram illustrating in detail a first panel of a plasma display panel including an electric field concentrator having a curved shape according to a preferred embodiment of the present invention.

The first substrate 502, the first dielectric layer 509a, the protective film 510, the X electrodes 512, 512a, 512b and the Y electrodes 514, 514a, 514b in FIG. 5 are shown in FIG. 4A or 4B. The first substrate 402, the first dielectric layer 409a, the passivation layer 410, the X electrodes 412, 412a, and 412b and the Y electrodes 414, 414a and 414b, respectively.

5 and 4A or 4B, the edge portion of the electric field concentrator 520 in FIG. 5 has a curved shape, whereas the edge portion 421 of the electric field concentrator 420 in FIG. 4A or 4B. It can be seen that the angle has an angled form.

As shown in FIG. 5, when the shape of the vertical cut surface obtained by cutting the electric field concentrator 520 perpendicular to the extending directions of the X electrode 512 and the Y electrode 514 is viewed so that the first substrate 502 side is upward, The lower end of the side surface of the electric field concentrator 520 (part corresponding to 421 in FIG. 4A or 4B) has a shape of a curved shape having a predetermined curvature (it is curved because it is a cut surface of a curved shape).

When the lower surface side of the electric field concentrator 520 is formed to have a curved shape, there is no angled edge so that the electric field does not be directed toward the lower side of the electric field concentrator. It can be. That is, the angled corner portion 421 of the conventional electric field concentrator 420 is formed in the form of a curved surface having a predetermined curvature in the present invention, so that the instability of discharge and breakage of the dielectric layer due to the electric field, which has been a problem in the prior art, are damaged. The problem is eliminated and the uniformity of the discharge is ensured to enable stable discharge.

Looking at the curved shape in the vertical cut surface of the electric field concentrator 520 as shown in Figure 5, it can be seen that the curved shape is a convex shape toward the center of the discharge cell.

In the present invention, the electric field concentrator 520 extends the X electrode 512 and the Y direction between the X electrode 520 and the Y electrode 514 for each of the plurality of discharge cells included in the plasma display panel. It is formed to be parallel to the extending direction of the electrode 514, and serves to concentrate the electric field between the X electrode 512 and the Y electrode 514 in the discharge space in the discharge cell.

In addition, referring to FIG. 5, which shows the shape of the vertical cut surface of the electric field concentrator 520, it can be seen that the electric field concentrator 520 is formed to be symmetric with respect to the center of the electric field concentrator 520. have.

In the present invention, the electric field concentrator 520 having a curved shape may be formed using a screen-printing method. The screen printing method is a method of printing a desired film shape on a substrate by placing a patterned screen mask on a substrate at a predetermined interval, pressing and transferring a paste necessary for film formation.

In addition, in the present invention, the electric field concentrator 520 having a curved shape may be formed using a photo-sensitive method. The photo-sensitive method is a method of forming a desired film shape on a substrate through a process such as printing, drying, exposure, development, firing, etc. using a photo-sensitive dielectric material.

In addition, in the present invention, the electric field concentrator 520 having a curved shape may be formed using a sand-blast method. The sand blast method is a method of forming a desired film shape by applying a wide film to a substrate and then spraying an abrasive through a nozzle to partially remove a part of the film.

In the present invention, the electric field concentrator 520 having a curved shape uses various methods in addition to the screen-printing method, the photo-sensitive method, or the sand-blast method. Can be formed.

6 is a view showing the structure of a discharge cell provided in the plasma display panel according to an embodiment of the present invention.

In FIG. 6, a first substrate 602, a second substrate 604, a partition 606, a phosphor layer 608, a first dielectric layer 609a, a second dielectric layer 609b, a protective film 610, and an X electrode ( 612, 612a, 612b, Y electrodes 614, 614a, 614b, and A electrode 616 are shown. In addition, the first dielectric layer 609a is provided with a groove-type electric field concentrator 620, and the lower end portion of the side surface of the electric field concentrator 620 has a curved shape with a predetermined curvature as described with reference to FIG. 5.

Hereinafter, the components of the discharge cell provided in the plasma display panel according to an exemplary embodiment of the present invention will be described in detail.

 In the present invention, the first panel of the plasma display panel includes a first substrate 602, a transparent electrode 612a on the X electrode side, and a bus electrode 612b on the X electrode side. The Y electrode 614 including the transparent electrode 614a and the bus electrode 614b on the Y electrode side, the first dielectric layer 609a, and the protective film 610 are provided.

The second panel includes a second substrate 604, an A electrode 616, a second dielectric layer 609b, a partition 606, and a phosphor layer 608.

The space between the first substrate 602 and the second substrate 604 is partitioned by the partition wall 606 to form a discharge cell as a unit discharge space that causes discharge.

The discharge cell is filled with discharge gas (approximately 0.5 atm or less) of a pressure lower than atmospheric pressure, and is discharged by the electric field formed according to the driving voltage applied to the respective electrodes involved in each discharge cell. Plasma discharge occurs as charges collide, and vacuum ultraviolet rays are generated as a result of the plasma discharge. As the discharge gas, a mixed gas obtained by mixing xenon (Xe) gas with any one or two or more of neon (Ne) gas, helium (He) gas, or argon (Ar) gas is used.

The partition wall 606 defines a discharge cell so that a basic unit of an image can be formed and prevents cross talk between the discharge cells. The partition 606 of the plasma display panel is cut in parallel to the first substrate 602 and the second substrate 604, and may have a polygonal structure such as a square, a hexagon, or an octagon, or a circular or elliptical structure. The same shape is determined according to the pattern in which the partition wall 606 is formed.

In the phosphor layer 608, a vacuum ultraviolet (VUV) generated by the discharge is absorbed to cause a photo luminescence light emitting mechanism that emits visible light when the excited electrons become stable again. The phosphor layer 608 may include a red light emitting phosphor layer, a green light emitting phosphor layer, and a blue light emitting phosphor layer to enable the plasma display panel to realize a color image. The phosphor layer 608 may include a red light emitting phosphor layer, a green light emitting phosphor layer, and a blue light emitting layer. The phosphor layer may be disposed inside the discharge cell to form a unit pixel. Examples of the red light emitting phosphor include (Y, Gd) BO3: Eu3 +, examples of the green light emitting phosphor include Zn2Si04: Mn2 +, and examples of the blue light emitting phosphor include BaMgAl10O17: Eu2 +.

In FIG. 6, the phosphor layer 608 is illustrated as being formed on the side of the second substrate 604 and the partition wall 606 in the discharge cell. However, in the present invention, the arrangement of the phosphor layer is not limited thereto and may have various embodiments.

The first dielectric layer 609a is a dielectric layer used as an insulating film for the X electrode 612 and the Y electrode 614, and uses a material having high insulation resistance and good light transmittance. Some of the charges generated by the discharge are attracted by electrical attraction due to the polarity of the voltage applied to the electrodes 612 and 614, and are accumulated in the vicinity of the first dielectric layer 609a (with the protective film 610 interposed) and wall charges. Form a Wall Charge.

As described above, in the present invention, the first dielectric layer 609a is provided with a groove-type electric field concentrator 620 having a lower end surface thereof in a curved shape. When the electric field concentrator 620 is formed to be disposed between the X electrode 612 and the Y electrode 614 in the first dielectric layer 609a, the discharge path between the X electrode 612 and the Y electrode 614 is shortened. Discharge between the X electrode 612 and the Y electrode 614 due to the effect of increasing the density of electrons (negative charge) and ions (positive charge) in the groove-shaped space where the electric field is concentrated. Is easily disclosed.

As shown in FIG. 6, the shape of the vertical cut surface obtained by cutting the electric field concentrator 620 so as to be perpendicular to the extending directions of the X electrode 612 and the Y electrode 614 is on the first substrate 602 side, and the second substrate is on the second substrate side. When the substrate 604 side is faced downward, the lower end portion of the side surface of the electric field concentrator 620 is formed to have a curved shape having a predetermined curvature (because it is a cut surface of a curved shape).

As shown in FIG. 6, the curved shape is a shape that is convex toward the center of the discharge cell.

The second dielectric layer 609b is a dielectric layer used as an insulating film of the A electrode 616 and uses a material having high insulation resistance. Unlike the first dielectric layer 609a, the second dielectric layer 609b does not participate in the transmission of visible light, so a material having a good light transmittance is not required.

The passivation layer 610 protects the first dielectric layer 609a and facilitates discharge by increasing the emission of secondary electrons during discharge. The protective film 610 is formed using a material such as magnesium oxide (MgO).

The X electrode 612 and the Y electrode 614 have transparent electrodes 612a and 614a and bus electrodes 612b and 614b, respectively, but the A electrode 616 is not involved in the transmission of visible light, so the X electrode ( Unlike the 612 and the Y electrode 614, the transparent electrode and the bus electrode are not provided separately, but have a single electrode structure.

The transparent electrodes 612a and 614a use a transparent material such as indium tin oxide (ITO) to transmit visible light emitted from the discharge cell. However, since the transparent electrodes 612a and 614a generally have high electrical resistance, auxiliary electrodes of the bus electrodes 612b and 614b formed of a metal having high electrical conductivity are supplemented to improve electrical conductivity of the electrodes 612 and 614. I'm making it.

The present invention is characterized in that the first dielectric layer 609a is provided with a groove-type electric field concentrator 620 having a lower side surface portion having a curved surface. Therefore, the present invention is not applied only to the structure in which the X electrode 612 and the Y electrode 614 include both the bus electrode and the transparent electrode as in the above description, and only the bus electrode without the transparent electrode as in the ITO-less structure. The same may be applied to the case of the plasma display panel forming the X electrode and the Y electrode.

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.

As described above, according to the present invention, the plasma display panel includes an electric field concentrator having a curved shape instead of an angled corner, thereby improving discharge stability and preventing breakage of the dielectric layer.

Claims (10)

A plasma display panel comprising a plurality of discharge cells between a first panel and a second panel that face each other in parallel. The first panel includes a first substrate, an X electrode and a Y electrode disposed on the first substrate and extending in parallel in one direction, and a first dielectric layer formed to cover the X electrode and the Y electrode, The first dielectric layer includes a field concentrator having a groove shape at a portion corresponding to each of the plurality of discharge cells. When the electric field concentrator looks at the shape of the vertical cut surface which cuts the electric field concentrator so as to be perpendicular to the extending directions of the X electrode and the Y electrode, the first panel side is upward and the second panel side is downward. The lower surface side portion of the electric field concentrator is formed to have a curved shape with a predetermined curvature, The curved shape is a shape that is convex toward the center of the discharge cell, The electric field concentrator is formed such that the shape of the vertical cut surface is symmetrical with respect to the center of the electric field concentrator. Plasma display panel characterized in that. delete The method of claim 1, The electric field concentrator is formed to be parallel to the extending direction of the X electrode and the extending direction of the Y electrode between the X electrode and the Y electrode. Plasma display panel characterized in that. delete The method of claim 1, The electric field concentrator having the curved shape is formed using a screen-printing method. Plasma display panel characterized in that. The method of claim 1, The electric field concentrator having the curved shape is formed using a photo-sensitive method. Plasma display panel characterized in that. The method of claim 1, The electric field concentrator having the curved shape is formed using a sand-blast method. Plasma display panel characterized in that. First and second substrates spaced apart from each other and opposed to each other; A partition wall partitioning a space between the first substrate and the second substrate to form a plurality of discharge cells; An X electrode and a Y electrode disposed on the first substrate and extending in parallel in one direction; The electric field concentrator is formed to cover the X electrode and the Y electrode and has a groove shape in a portion corresponding to each of the plurality of discharge cells, and the electric field concentrator extends in the X electrode and the Y electrode. When looking at the shape of the vertical cut surface cut to be perpendicular to the first substrate side up and the second substrate side down, the lower end of the side portion of the electric field concentrator is formed to have a curved shape having a predetermined curvature A first dielectric layer; An A electrode disposed on the second substrate and extending in a direction crossing the extension direction of the X electrode; A second dielectric layer formed to cover the A electrode; A phosphor layer disposed in the discharge cell; And Discharge gas is filled in the discharge space in the discharge cell; The curved shape is a shape that is convex toward the center of the discharge cell, wherein the electric field concentrator is formed such that the shape of the vertical cut surface is symmetrical with respect to the center of the electric field concentrator. Plasma display panel characterized in that. delete The method of claim 8, The plasma display panel further includes a protective film for protecting the first dielectric layer. Plasma display panel characterized in that.

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