KR100813847B1 - The manufacturing method of the barrier rib for the plasma display panel and the lower panel for the plasma display panel having the same - Google Patents

Abstract

A method of manufacturing a barrier rib for a plasma display panel and a lower panel including the barrier rib is provided to make shape of the barrier rib precisely by preventing vapors from being formed, while a liquid photo-sensitive paste is condensed into a mold. A mold pattern is formed on one surface of a soft mold(S101). A green sheet is arranged to be opposed to the soft mold(S103). The mold pattern is transferred on the green sheet to the first depth by using at least one pressure plate, which is moved on a rear surface of the soft mold or the green sheet(S105). The mold pattern is transferred on the green sheet to the second depth by using at least one pressure roller, which is rotated on the rear surface of the soft mold or the green sheet(S107). The soft mold is released from the green sheet, on which the mold pattern is formed(S111). The green sheet is plasticized(S113).

Description

Bulkhead for plasma display panel and lower plate including the same {The manufacturing method of the barrier rib for the plasma display panel and the lower panel for the plasma display panel having the same}

1 is an exploded perspective view showing one embodiment of a conventional plasma display panel.

2 is a process flowchart related to the method for manufacturing a lower plate for a plasma display panel of the present invention.

3A-3H are schematic process diagrams for the steps shown in FIG.

4A is a perspective view showing one embodiment of a soft mold for partition wall formation of a plasma display panel.

4B is a partially cutaway perspective view taken along the line AA ′ of FIG. 4A.

5A to 5C are cross-sectional views illustrating a process of forming the green sheet according to the movement of the pressure plate.

6A and 6B illustrate different press forms that may be applied in the first press forming step of the present invention.

7 is a vertical sectional view schematically showing a second pressure molding step of the present invention.

8A and 8B illustrate different press forms that may be applied to the second forming step of the present invention.

9 is a view showing another pressurized form that can be applied in the second forming step of the present invention.

10 is a vertical cross-sectional view showing the molding process of the green sheet by the preceding pressure roller and the trailing pressure roller.

11 to 13 are views showing different pressing forms that can be applied in the second forming step of the present invention.

14 is a view illustrating various embodiments according to a molding direction set in a second molding step.

<Description of the symbols for the main parts of the drawings>

100: soft mold 101; Indentation

102: uneven portion 105: mold pattern

110; Bulkhead Green Sheet 120: Lower Board

121: address electrodes 210, 211, 212, 213: pressure plate

220,321,322,421,422,423,521,522,523,521,522,523: Pressing roller

W, W1, W2, W3: Pressing width Wg: Overall width of green sheet

δ, δ1, δ2; Rolling reduction

The present invention relates to a method of manufacturing a partition wall provided in a plasma display panel and a method of manufacturing a lower plate for a plasma display panel including the same.

Plasma Display Panel (hereinafter referred to as "PDP") forms a sustain electrode and an address electrode in a matrix form between an upper substrate and a lower substrate, causing discharge between the electrodes, and using the ultraviolet rays generated therein. A flat panel display device that realizes an image by exciting a phosphor.

1 is a schematic view showing a surface discharge plasma display panel of a conventional AC drive system. The lower dielectric layer 21 filling the address electrodes 22 is formed on the lower substrate 20 on which the plurality of address electrodes 22 are disposed, and a plurality of discharge spaces G are partitioned on the lower dielectric layer 21. Thus, partition walls 24 are formed to form independent light emitting regions, respectively. R, G, and B phosphors 25 are coated in the discharge spaces G, respectively. The phosphor 25 is excited by ultraviolet rays generated during plasma discharge to generate visible light constituting a predetermined image.

The upper dielectric layer 11 and the passivation layer 15 are sequentially formed on the upper substrate 10 on which the sustain electrode pairs 16 are disposed. The dielectric dielectric layer 11 accumulates wall charges during plasma discharge, and the protective layer 15 protects the pair of sustain electrodes 16 and the dielectric dielectric layer 11 from sputtering of gas ions during plasma discharge. It increases the emission efficiency. An inert mixed gas of He, Xe, and Ne is enclosed in the discharge space G of the PDP at a pressure of about 400 to 600 Torr.

As shown in FIG. 1, the partition wall 24 may be formed in a stripe type of an open structure or a closed structure having a higher discharge efficiency, and may be formed between the upper and lower substrates 10 and 20. Maintain a predetermined interval, and serves to partition the discharge space (G). The partition wall 24 prevents electrical and optical crosstalk between the discharge spaces G, thereby improving image quality including color purity, and coating area on which the phosphor 25 is applied. It contributes to the light emission luminance of the PDP. Along with this direct role, the partition wall 24 defines a pixel as a minimum unit of an image formed by collecting the discharge spaces G of R, G, and B by dividing the discharge spaces G. In addition, the cell pitch between the discharge spaces G is defined to determine the resolution of the image. Therefore, the partition wall 24 is a core configuration for image quality and luminous efficiency, and in recent years, various studies on the partition wall 24 have been made as the panel needs to be enlarged and fixed in size.

As a method of manufacturing a general partition, a screen printing method, a sandblasting method, an etching method, a photolithography method using a photosensitive paste, and the like are applied. Among them, the screen printing method has the advantages of a simple process and a low manufacturing cost, but there is a problem in that the screen and the lower substrate are aligned, the printing and drying of the glass paste are repeated several times during each printing. In addition, when the position of the screen and the substrate is displaced during the printing process, the partition wall is deformed, so that the upper surface of the partition wall is not flat and the shape accuracy is inferior.

The sand blasting method has an advantage in large area, there is a certain limit to the formation of ultra-fine partition walls using the physical impact of the most commonly used process or the etching particles piggybacked in high-pressure air. In addition, in the laminating process of attaching a dry film resist to the partition paste as an etch barrier, if the dry film is not attached to the paste layer on the paste layer, the partition may be distorted to an unintended shape during sandblasting. have. Even in the peeling process of a dry film, when a processing time becomes long, there exists a problem that a partition is peeled from a dielectric layer and a desired partition shape cannot be obtained.

An etching method is a process of attaching a partition material on a board | substrate, and then etching a partition material using an appropriate etching liquid. The etching method has excellent shape stability, can form a high-definition closed-type partition wall, and can simplify the steps of the manufacturing process as compared to the conventional sandblasting process. It is a competitive process. However, since the etching method inevitably involves mechanical and chemical etching, the material loss is very high and environmental pollution occurs. In particular, there is a problem that the bulkhead shape is not uniform in a large area PDP, and the raw material is etched. There is a problem with fewer candidate substance groups because it is limited to possible substances.

In the photolithography method using the photosensitive paste, the photosensitive paste containing the ceramic partition wall material is coated on a substrate, dried to form a desired thickness, the masks are aligned to selectively expose the photosensitive paste, and the exposed portion is developed. It is a process of manufacturing a final partition by carrying out baking process after removing and obtaining a partition shape. The photolithography method is a simpler process than the above-described etching method since the step of forming the photoresist is eliminated. However, in the photolithography method, there is a problem that the partition wall shape is changed depending on the exposure conditions. That is, when exposing the photosensitive paste of the thick film containing a glass powder and a ceramic powder, uniform photosensitive is difficult by the scattering effect of these fillers. In addition, in the production of large area panels such as PDPs, it is not easy to reproduce the uniform exposure conditions over a large area, and the price of the photosensitive paste is expensive, and the bulkhead material is removed like the sandblasting method. There is a problem that occurs.

The conventional processes have a problem in that there is a process limitation or a low productivity in the production of a high-definition partition wall, and recently, a partition wall production method using a mold has been proposed. The production method of the partition disclosed in WO 2000/52299 is as follows. First, the mold is aligned with the substrate on which the electrode is formed, and then one end of the mold is fixed. Next, the liquid photosensitive paste which is a partition material is supplied between a mold and a board | substrate. That is, the photosensitive paste is supplied between the surface on which the mold pattern is formed and the substrate, and then the opposing surface on which the mold pattern is formed is filled to fill the photosensitive paste in the groove portion of the mold.

Then, the photosensitive paste filled in the grooves of the mold is irradiated with UV light and cured, and the mold is released to obtain a final partition. However, in the partition wall manufacturing method using the above-described mold, air is likely to be included in the liquid photosensitive paste as the partition wall material, which causes defects in the partition shape after firing. In addition, in order to harden the liquid photosensitive paste filled in the mold, it is necessary to go through a UV irradiation step, the number of processes increases. In addition, since the UV is inevitably irradiated to the mold of the polymer material, the life of the mold to be repeatedly used is shortened, and since the paste cured through UV irradiation is less releasable, there is no problem in mold release. Is generated.

SUMMARY OF THE INVENTION An object of the present invention relates to a plasma display panel partition wall capable of forming a high-definition partition pattern with high shape accuracy and a method of manufacturing a lower plate including the same.

In order to achieve the above objects and other objects, the manufacturing method of the partition wall for plasma display panel according to an aspect of the present invention,

Preparing a soft mold having a mold pattern formed on one surface thereof;

Arranging the green sheet to face the soft mold;

A first molding step of causing the mold pattern to be transferred to the first depth of the green sheet by at least one pressure plate translating in pressure contact with the back surface of the soft mold or green sheet;

A second molding step of causing the mold pattern to be transferred to the second depth of the green sheet by at least one pressure roller which rotates in a pressure contact with the back surface of the soft mold or the green sheet;

Releasing the soft mold from the green sheet to which the mold pattern is transferred; And

And firing the patterned green sheet.

On the other hand, the manufacturing method of the lower plate for the plasma display panel according to another aspect of the present invention,

Preparing a soft mold having a mold pattern formed on one surface thereof;

Arranging the green sheet to face the soft mold;

A first molding step of causing the mold pattern to be transferred to the first depth of the green sheet by at least one pressure plate translating in pressure contact with the back surface of the soft mold or green sheet;

A second molding step of causing the mold pattern to be transferred to the second depth of the green sheet by at least one pressure roller which rotates in a pressure contact with the back surface of the soft mold or the green sheet;

Pressing the surface opposite to the pattern of the green sheet against the prepared lower substrate;

Releasing the soft mold from the green sheet; And

It comprises a step; to complete the lower plate by firing in a high temperature atmosphere.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 2 is a flowchart illustrating a method of manufacturing a lower plate for a PDP of the present invention. Referring to the drawings, the manufacturing method of the present invention is largely the step of preparing a soft mold (S101), the step of placing the green sheet on the soft mold facing (S103), the first forming step (S105) by the pressure plate ), The second molding step (S107) by the pressure roller, the step of pressing the green sheet against the prepared lower substrate (S109), the step of removing the soft mold (S111), and the plastic sheet is plasticized A step S113 is made.

Hereinafter, each of the above-described steps will be described in detail with reference to FIGS. 3A to 3H. The lower plate for PDP is formed through the following steps. First, to prepare a soft mold 100 having a partition-shaped pattern on the upper surface (Fig. 3a), the soft mold 100 is used as a mold for the transfer, the mold pattern is inversely opposite to the finally obtained partition pattern Has a relationship. 4A is a perspective view of one embodiment of the soft mold 100, and FIG. 4B is a partially cutaway perspective view taken along the line A-A 'of FIG. 4A. Referring to the drawings, the soft mold 100 has a mold pattern 105 on which an uneven portion 102 and a recessed portion 101 are repeated. The uneven portion 102 is formed by imprint transfer. The concave space is formed on the partition material for the discharge space, and the concave portion 101 forms a partition wall protruding on the partition material to partition the discharge spaces from each other.

On the other hand, since the soft mold 100 is made of a flexible material, the surface moldability of the soft mold 100 is lower than that of the hard mold made of a hard material such as metal, metal oxide, ceramic, or the like. In addition, the soft mold 100 made of a flexible material absorbs vibrations or movements generated during the release process by itself and does not put a load on the finished partition pattern, thereby structurally preventing deformation of the partition pattern. .

After placing the soft mold 100 prepared as shown in FIG. 3A on the normal support surface P, a release agent (not shown) is applied to the upper surface of the soft mold 100. Here, the release agent is such that the partition green sheet 110 to be in close contact with the upper surface of the soft mold 100 does not adhere to the soft mold 100 so as to manufacture the partition wall, between the soft mold 100 and the green sheet 110. It plays a role in improving dysplasia.

Next, the green sheet 110 is disposed on the soft mold 100 so as to face each other (FIG. 3B), and the pressure plate 210 prepared on the green sheet 100 is brought into pressure contact with a predetermined pressure. By translating to the other end at, a first molding step for transferring the mold pattern onto the green sheet 110 is performed (FIG. 3C). 5A to 5C illustrate a deformation state of the green sheet 110 according to the movement of the pressing plate 210 in the first forming step. Referring to the drawings, the pressing plate 210 has a pressing portion rounded to a predetermined radius (R) at its tip. In addition, the pressing plate 210 is set to be lowered to a predetermined pressing amount δ based on the vertical position of the upper surface of the green sheet 110 before molding. The green sheet 110 is forced toward the soft mold 100 by the downward pressure provided by the pressure plate 210 to fill the recess 101 formed in the soft mold 100. In this case, the mold pattern 105 is reversely transferred to the surface of the green sheet 110 through the pressure filling process. Here, in order to have a shape in which the surface of the green sheet 110 is completely matched with the mold pattern 105, through the effective pressing on the green sheet 100, the concave portion 101 of the mold pattern 105 is formed. The filling rate should be increased. Accordingly, the present invention provides various embodiments of the press molding process for increasing the filling rate of the mold pattern 105.

6A and 6B show different embodiments of the pressurization process that can be applied in this first forming step. That is, referring to Figure 6a, by applying a pressure plate 210 is formed over the entire width (Wg) of the green sheet 110 can be pressed over the entire width (Wg) through a single process. Alternatively, although not shown in the drawings, the narrow width of the pressing plate formed over a portion of the width of the green sheet 110 may be reciprocated along a path set in a zigzag pattern, with respect to the total width Wg of the green sheet 110. Pressurization can be achieved. As another embodiment, as shown in Figure 6b, there is a method for applying a gradual pressing on the green sheet 110 by applying a plurality of pressing plates 211,212,213 leading and trailing along the direction of travel. . For example, as can be seen in the figure, the first pressing plate 211 is preceded, and the second and third pressing plates 212 and 213 are parallel to each other along the back of the first pressing plate 211. In addition, the preceding first pressing plate 211 has a pressing width W1 corresponding to the full width Wg of the green sheet, and each of the following second and third pressing plates 212 and 213 is the green sheet Wg. Although having a narrower pressing width (W1, W2), they are arranged side by side together to form a sufficiently wide pressing width corresponding to the full width (Wg) of the green sheet (110). As the first pressing plate 211 and the second and third pressing plates 212 and 213 which are in a posterior relationship pressurize the same area on the green sheet 110 with a time difference, gradual pressing may be performed. That is, when the rolling reductions set on the preceding pressing plates 211 and the following pressing plates 212 and 213 are respectively δ1 and δ2 on the basis of the vertical position before pressing on the upper surface of the green sheet 110, the relationship of δ1 <δ2 Pressing conditions satisfying the above are added.

Meanwhile, the narrow second and third pressing plates 212 and 213 are arranged side by side to correspond to the total width Wg of the green sheet 110 to provide uniform pressing conditions over the entire area. In general, it is inevitable that bending deformation is caused to some extent along the width direction of the pressing plates 211, 212, 213. For example, the repulsive load exerted from the green sheet 110 is different at both end portions and the center portion of the pressure plates 211, 212, 213, and the support state from the equipment operating the pressure plates 211, 212, 213 is somewhat different. have. Therefore, as the lengths of the pressing plates 211, 212, 213 increase, non-uniform pressing conditions are added according to the position of the green sheet 110, and thus, the precision of the partition pattern transferred on the green sheet 110 is inferior. May be generated. From the above consideration, instead of the wide single pressing plate, by arranging narrow second and third pressing plates 212 and 213 side by side, a highly uniform partition pattern is provided. In particular, this method can be very usefully used to increase the precision of the pattern when forming a partition pattern applied to a large area display of 40 inches or more.

On the other hand, prior to molding by the pressure roller to be described later, preliminary to the present molding step by the pressing plate 210 in consideration of the characteristics of the roll molding. That is, due to the characteristics of the pressure roller that provides a predetermined pressure while rotating at a constant speed, each green sheet 110 region cannot be precisely pressed upwards vertically, and the direction of the pressing force changes in a small angle range, so that the green sheet ( Unintended directionality may be formed in the transfer pattern on 110. Therefore, in the present invention, in order to form an accurate transfer pattern, after forming by the pressing plate 210 to form the basic structure of the transfer pattern, the molding by the pressure roller is performed.

Next, after the above-described first molding step (FIG. 3D), the pressure roller 220 is pressed into contact with the upper surface of the green sheet 110, and then the pressure roller 220 is rotated from one end to the other end, A second molding step is performed to completely fill the mold pattern 105 with the green sheet 110 (FIG. 3D). 7 is a process diagram schematically shown to conceptually illustrate this molding step. As shown, the pressure roller 220 has a diameter (R) optimized for the molding of the green sheet 110, the pressure roller is lowered by the amount δ downward downward with respect to the upper surface of the green sheet 110 before molding As the green sheet 110 is forcibly filled into the recess 101 of the mold pattern 105 by the 220, the green sheet 110 is molded.

In the second molding step, the green sheet 110 material is forced to flow into the concave portion 101 of the unfilled mold pattern 105 through the first molding step, thereby completely filling the space. Accordingly, a high precision transfer pattern is formed on the green sheet 110 to completely match the mold pattern 105. In addition, in the second forming step by the pressure roller 220, the upper surface of the green sheet 110 may be flattened by the action of the pressure roller 220. As will be described later, since the green sheet 110 is bonded to the lower substrate through the upper surface thereof, it is preferable that the flatness of the upper surface of the green sheet 110 to be the bonding surface is high in order to improve the adhesion between the two.

Hereinafter, various embodiments of the second molding step that can be applied in the present invention will be described. 8A illustrates an embodiment of the pressure roller 220 having a wide pressing width W corresponding to the full width Wg of the green sheet 110 in relation to the green sheet 110 or the soft mold. 8B shows another embodiment of the pressure roller 220 ′ having a narrow width W corresponding to a portion width of the green sheet 100. Each method has different advantages and disadvantages. For example, according to the method of FIG. 8A, there is an advantage in the process that a batch operation on the entire width Wg of the green sheet 110 may be performed by one press. . Meanwhile, according to the method of FIG. 8B, while the pressure roller 220 ′ proceeds in an arbitrary direction, the green sheet 110 is pressed into a mold pattern by pressing the green sheet 110 in a predetermined pressing amount, and then moved laterally to move the green sheet 110. Will pressurize the entire area. According to this, there is a disadvantage in that the number of processes is increased by dividing and pressing the entire width Wg of the green sheet 110 several times as the pressing width W` is narrow, but occurs along the width direction of the pressing roller 220`. The bending deformation that can be reduced can be reduced, whereby the pressure is concentrated locally in some regions of the green sheet 110, and the so-called non-uniformity of the pressing state is insufficient in other regions of the green sheet 110. There is an advantage that it can be prevented, to obtain an even-shaped partition wall pattern. In particular, when manufacturing a large display of 40 inches or more, as shown in Figure 8b, rather than using a pressure roller 220 having a relatively wide corresponding to the green sheet 110 in consideration of the bending deformation state narrow ( It would be more desirable to use a pressure roller 220` having W`).

9 illustrates a method of using at least two pressure rollers 321 and 322 leading and trailing in the advancing direction to increase the filling rate for the mold pattern. That is, according to the illustrated method, the same area with a slight time difference is applied by applying the preceding first pressing roller 321 and the following second pressing roller 322 with the same overlapping pressing widths W1 and W2. Gradually pressing the green sheet 110 may be performed while driving. FIG. 10 is a cross-sectional view showing the relationship between the reduction amounts δ1 and δ2 set for the preceding pressure roller and the following pressure roller, respectively. As can be seen in the drawing, the amount of reduction in the Z direction set for the preceding pressing roller 321 ′ and the trailing pressing roller 322 ′ on the basis of the vertical position of the upper surface of the green sheet 110 before pressing, respectively δ1, δ2. In this case, pressurization conditions satisfying the relationship of δ1 <δ2 can be given. In this case, the green sheet 110 to be pressed is primarily pressurized by the preceding pressure roller 321 ′, and then deep pressurized by the trailing pressure roller 322 ′. Therefore, as the pressurization proceeds in multiple stages at least two times without deep pressurization at once, it is possible to reduce the load transfer to the soft mold 100 repeatedly used as a mold, thereby reducing the plastic deformation of the soft mold 100. By minimizing and controlling the amount of pressing down downwards two or more times, there is a technical advantage of manufacturing a more precise bulkhead compared to the method of deep pressing at a time with a single pressure roller. In order to set the reduction amounts δ1, δ2 for each pressure roller differently, as shown, pressure rollers 321 ', 322' having different diameters r1, r2 can be used. Of course, the rolling reduction amount may also be set differently by setting pressure rollers having substantially the same diameter to different separation heights with respect to the supporting surface. On the other hand, the reduction amount with respect to the preceding pressure roller 321 ′ and the trailing pressure roller 322 ′ may be set equal to each other. At this time, the trailing pressure roller 322 ′ serves to completely fill the mold pattern 105 by pressing the green sheet 110 once more after the preceding pressure roller 321 ′.

11 shows another pressurization scheme that can be applied in the present molding step. As can be seen in the drawing, the preceding first pressing roller 421 and the second and third pressing rollers 422 and 423 arranged side by side are applied. As described above, the preceding pressing roller 421 and the following pressing rollers 422 and 423 are differentiated in their diameters, so that the pressing amount is different from each other, so that the pressing and sequential pressures are sequentially performed while the shallow pressing and the deep pressing are sequentially performed. I can lose it. Alternatively, the same reduction amount is set for the leading and trailing pressure rollers 421, 422, 423, so that the trailing pressure rollers 422, 423 may be operated in such a manner as to be added again after the preceding pressure roller 421. As can be seen in the figure, the preceding first pressing roller 421 is disposed at the center of the green sheet 110 to be pressed, and the following second and third pressing rollers 422 and 423 have their pressing widths W2, W3) may be disposed on both left and right sides of the green sheet 110 so as to partially overlap the first pressing roller 421. The second and third pressing rollers 422 and 423 may be arranged in parallel with each other to form a wide pressing width corresponding to the full width Wg of the green sheet 110.

By arranging the two or more pressure rollers 422, 423 side by side in this way to minimize the bending deformation that can occur along the width direction of the pressure roller, the pressure is concentrated in some areas of the green sheet 110 according to the deformation, In the region, a so-called non-uniform pressurized state in which pressure is insufficient can be suppressed. In order to meet this purpose, it is a matter of course that the preceding pressure rollers are operated in a plurality of two or more, or the following pressure rollers are operated in a plurality of three or more. In particular, in order to realize a large display of 40 inches or more, it may be preferable to operate a plurality of pressure rollers having a relatively narrow width together with a single pressure roller having a wide width.

Figure 12 shows another pressurization scheme that can be applied in this molding step. In the illustrated method, the first and second pressure rollers 521 and 522 arranged side by side are preceded and followed by the third pressure roller 523. As described above, the reduction amounts set for the preceding and trailing pressure rollers 521, 522, 523 may be set to be the same as or different from each other. In this case, the trailing pressure roller 523 may be understood to be applied to deeper pressing in the former case and to repressurizing the same depth in the latter case.

On the other hand, as can be seen in the drawing, it is preferable that the trailing third pressing roller 523 is disposed such that the pressing width W3 includes a region between the first and second pressing rollers 521 and 522. In this case, the third pressing roller 523 may have a pressing width W3 which overlaps the first pressing roller 521 and the second pressing roller 522, respectively. A certain clearance may be formed between the first and second pressure rollers 521 and 522, and thus a sufficient pressure may not be provided to the area therebetween. Thus, in order to provide even pressing force over the entire area of the green sheet 110, it may be desirable to adjust the position with respect to the third pressing roller 523. As described above, in order to minimize the bending deformation of the pressing roller, the number of preceding pressing rollers and / or trailing pressing rollers can of course be increased as necessary.

Figure 13 shows another pressurization scheme that can be applied in the present molding step. Referring to the drawings, the first to third pressure rollers 621, 622, and 623 are sequentially disposed and driven along the traveling direction thereof. Also in this pressing method, the reduction amounts for the respective pressure rollers 621, 622, and 623 may be set to be the same or different from each other. On the other hand, as can be seen in the drawings, the first to third pressure rollers (621, 622, 623) can be mutually adjusted to have a pressing width (W1, W2, W3) to some extent overlap with each other. The alignment of the pressure rollers 621, 622, 623 to some extent overlaps with each other in consideration of a common error in arrangement and the like, and excludes a non-uniform pressure state caused by an end of the pressure roller. The first to third pressure rollers 621, 622, 623 are arranged in parallel to each other to form a sufficient pressure width corresponding to the full width Wg of the green sheet. In consideration of the size of the green sheet 110 to be pressed, the precision of the partition shape required, the processing cost, and the like, the number of the pressing rollers may be increased or decreased according to a specific embodiment of the pressing method. .

On the other hand, it is preferable that the molding direction of the pressing roller 220 is set in consideration of the relative arrangement with the mold pattern 105, which is the forming direction of the pressing roller 220 affects the filling rate of the mold pattern 105. Because it's crazy. That is, in the shape of the mold pattern 105, when the direction in which the longest embossed or engraved shape extends is referred to as the longitudinal direction of the mold pattern 105, the pressing roller 220 may be formed in the mold pattern 105. It is preferred to proceed perpendicular to the longitudinal direction. This is because a higher filling rate can be obtained when the pressing roller 220 proceeds in parallel to the longitudinal direction of the mold pattern 105. Here, in most cases, the longitudinal direction of the mold pattern 115 will be a direction along the partition wall formed in an elongate shape. As described above, in the present invention, in transferring the partition pattern onto the green sheet 110, it is necessary to vary the forming path of the pressing roller 220 according to the partition shape. In particular, the forming path of the pressure roller 220 is relatively important in order to fabricate the partition structure of the sophisticated structure that can increase the resolution and discharge efficiency of the PDP, so that the transfer of the partition pattern for high efficiency onto the green sheet 110. In order to select the forming path of the pressure roller 220 at an angle corresponding to the partition shape. As can be seen in FIG. 14, the pressure roller 220 is disposed in parallel with one end 110a of the green sheet 110 (or soft mold) (θ1 = 0 degrees) and thus runs along a first vertical direction. Alternatively, the green sheet 110 may be inclined at an angle θ2 and θ3 with one end 110a and proceed along a second direction or a third direction perpendicular thereto. In this case, in order to adjust the relative angles with respect to the pressure roller 220 and the green sheet 110 or the soft mold, the method of rotating the pressure roller 220 at a predetermined angle, on the contrary, the pressure roller 220 As it is, there is a method of rotating the support surface on which the green sheet 110 or the soft mold is placed at a predetermined angle. After the second molding step is completed, the hardened partition wall pattern may be obtained by baking the green sheet 110 on which the partition pattern is formed in a high temperature atmosphere.

On the other hand, another aspect of the present invention provides a method for manufacturing a lower plate for PDP including the subsequent steps following the production of the partition pattern described above. This comprises the following steps which proceed after the second forming step (FIG. 3D). First, the green sheet 110 to which the mold pattern 105 is transferred is disposed to face the lower substrate 120 provided in a separate process (FIG. 3E). The lower substrate 120 may be prepared as a glass substrate. A plurality of address electrodes 121 may be disposed on the lower substrate 120, and optionally, a dielectric layer (not shown) covering the address electrodes 121 may be formed. For reference, the dielectric layer fills the address electrodes 121 and protects them. The green sheet 110 after the forming step of the present invention partitions the discharge space through a partition pattern formed on one surface thereof. In addition, since the dielectric layer can also serve as a base layer supporting the partition pattern, the dielectric layer is not an essential configuration. Meanwhile, when the green sheet 110 and the lower substrate 120 are disposed to face each other in this step, one surface of the green sheet 110 on which the barrier rib pattern is not formed is disposed on the lower substrate (with the address electrodes 121 disposed thereon). Place it upside down to face the upper surface of 120). When arranged in this way, one surface of the soft mold 100 attached to the green sheet 110 comes to the top surface.

Next, the step of pressing the lower substrate 120 and the green sheet 100 against each other is bonded (Fig. 3f). More specifically, the green sheet 110 and the lower substrate 120 which are disposed to face each other by applying a pressing means 230 which provides a predetermined pressure to the back surface of the soft mold 100 are pressed against each other. do. In this case, as the pressing means 230, for example, a pressing roller 230 for providing pressure while rotating in one direction of the other end of the soft mold 100 may be used. Through the pressing process, if the pressure contact between the green sheet 110 and the lower substrate 120 is sufficiently made, the useful soft mold 100 is removed from the green sheet 110 by removing (FIG. 3G). Finally, by baking the lower plate structure from which the soft mold 100 is removed at an appropriate temperature, for example, a high temperature of 500 degrees or more, the partition pattern formed on the green sheet 110 is cured, and the green sheet 110 and The coupling between the lower substrate 120 is firm.

According to the present invention, the barrier rib pattern for PDP is molded by pressing the barrier green sheet on the soft mold as a mold. Therefore, compared with the conventional manufacturing method of filling the photosensitive paste into the mold and forming the partition pattern through the curing process, the photocuring process can be omitted, so that the manufacturing process can be shortened, and the liquid photosensitive paste is filled into the mold. Since the generation of bubbles that may be mixed in the process can be basically excluded, it is possible to increase the precision of the partition shape.

Particularly, in the present invention, various pressing techniques are provided in which the green sheet material is completely filled in the recesses of the mold pattern so as to transfer the partition pattern of the correct shape onto the green sheet during press molding of the partition green sheet. Sophisticated partition wall patterns for implementing a display can be molded with high shape precision.

Although the present invention has been described with reference to the embodiments illustrated 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 (25)

Preparing a soft mold having a mold pattern formed on one surface thereof; Arranging the green sheet to face the soft mold; A first molding step of causing the mold pattern to be transferred to the first depth of the green sheet by at least one pressure plate translating in pressure contact with the back surface of the soft mold or green sheet; A second molding step of causing the mold pattern to be transferred to the second depth of the green sheet by at least one pressure roller which rotates in a pressure contact with the back surface of the soft mold or the green sheet; Releasing the soft mold from the green sheet to which the mold pattern is transferred; And Baking the patterned green sheet; a method of manufacturing a partition for a plasma display panel comprising a. The method of claim 1, And the first depth (d1) and the second depth (d2) satisfy a relationship of d1? D2. Preparing a soft mold having a mold pattern formed on one surface thereof; Arranging the green sheet to face the soft mold; A first molding step of causing the mold pattern to be transferred to the first depth of the green sheet by at least one pressure plate translating in pressure contact with the back surface of the soft mold or green sheet; A second molding step of causing the mold pattern to be transferred to the second depth of the green sheet by at least one pressure roller which rotates in a pressure contact with the back surface of the soft mold or the green sheet; Pressing the surface opposite to the pattern of the green sheet against the prepared lower substrate; Releasing the soft mold from the green sheet; And Comprising a firing process in a high temperature atmosphere to complete the lower plate; manufacturing method of a lower plate for a plasma display panel comprising a. The method of claim 3, The mold pattern of the soft mold has an inverse relationship with a desired partition wall pattern, and has a concave-convex portion to form a discharge space on the green sheet and a concave portion to form a partition to partition the discharge spaces. The manufacturing method of the lower board for display panels. The method of claim 3, The method of manufacturing a lower plate for a plasma display panel further comprising the step of applying a release agent on the mold pattern of the soft mold before the first molding step. The method of claim 3, And the first forming step is performed by the pressing plate extending over the entire width of the green sheet and having a round pressing portion at a tip end thereof. The method of claim 3, And said first forming step is performed by at least two said pressing plates extending over a part of width of said green sheet and arranged side by side in the width direction. The method of claim 7, wherein The pressing plates are arranged parallel to each other to form a pressing width corresponding to the full width of the green sheet manufacturing method of the lower plate for a plasma display panel. The method of claim 3, And the first forming step is performed by the pressing plates arranged in a forward and backward direction along a traveling direction so that at least a part of the pressing width overlaps each other. The method of claim 3, And said second forming step is made by said pressing roller extending over the full width of said green sheet. The method of claim 3, And the second forming step is performed by at least two pressurizing rollers extending over a portion of the green sheet and arranged side by side in the width direction. The method of claim 11, The pressing rollers are arranged parallel to each other to form a pressing width corresponding to the full width of the green sheet manufacturing method of the lower panel for a plasma display panel. The method of claim 3, The second molding step is performed by the pressure roller extending over a part of the width of the green sheet once traveling is completed from one end to the other end, and then traveled a predetermined interval in the width direction and the driving is repeated again. Method of manufacturing the bottom plate. The method of claim 3, And wherein said second forming step is performed by said pressing rollers arranged laterally along said traveling direction so that at least a portion of said pressing width overlaps each other. The method of claim 14, The lowering amount δ1 of the preceding pressure roller and the lowering amount δ2 of the trailing pressure roller respectively set on the basis of the vertical position of the upper surface of the green sheet satisfy the relationship of δ1 ≦ δ2. Manufacturing method. The method of claim 15, The green sheet is a manufacturing method of the lower plate for a plasma display panel, characterized in that the pressure is progressively pressed by the pressing rollers going forward and backward. The method of claim 14, The pressure rollers, A preceding first pressing roller; And And a second pressing roller disposed to overlap the first pressing roller and having a same pressing width as that of the first pressing roller. The method of claim 14, The pressure rollers, A preceding first pressing roller; And And second and third pressure rollers, each of which has a portion of a pressing width overlapping with the first pressure roller, and trailing side by side, parallel to each other. 2. The method of claim 14, The pressure rollers, First and second pressure rollers disposed to be parallel to each other; And And a third pressing roller which is disposed so that a part of the pressing width overlaps with the first pressing roller and the second pressing roller. The method of claim 14, The pressure rollers, A preceding first pressing roller; A second pressing roller disposed so as to overlap a portion of the pressing width with the first pressing roller; And And a third pressing roller which is disposed so that a part of the pressing width overlaps with the second pressing roller and follows the second pressing roller. The method of claim 3, And the pressing roller is disposed in parallel with one end of the pressing surface and proceeds in the vertical direction thereof. The method of claim 3, And the pressing roller is disposed obliquely with respect to one end of the pressing surface and proceeds in a vertical direction thereof. The method of claim 3, And the forming path of the pressing roller is set in a direction perpendicular to the longitudinal direction of the mold pattern. The method of claim 23, wherein And said longitudinal direction is a longitudinal direction in which the longest shape extends in the mold pattern. The method of claim 24, Wherein the longitudinal direction is a direction in which a portion corresponding to the partition wall extends.

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