KR100525892B1 - Barrier rib for plasma display panel and fabrication method thereof - Google Patents

Abstract

Disclosed are a partition for a plasma display panel, and a method of manufacturing the same, which can improve surface roughness.

The bulkhead for plasma display panel of the present invention has a fishbone type structure in which a narrow bulkhead and a wide bulkhead are alternately connected, and the wide bulkhead is formed from an upper center width so as to have the same plastic shrinkage ratio at the top and the bottom during firing. It is formed by dividing at least two or more sub partitions by a predetermined depth in the downward direction.

Therefore, according to the present invention, the wide partition is divided into at least two or more sub partitions to have the same plastic shrinkage rate in both the upper and lower portions of the wide partition, thereby improving the surface roughness and thus cracking or collapsing the upper part of the wide partition. This can solve the problem that occurs.

Description

Barrier rib for plasma display panel and its manufacturing method {Barrier rib for plasma display panel and fabrication method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a partition wall and a method of manufacturing the same, wherein surface roughness can be improved.

Plasma display panels are in the spotlight as next generation display devices having the highest practicality among flat panel display devices. That is, the plasma display panel has high brightness and a wide viewing angle, and thus has wide applicability as a large, thin display such as an outdoor advertising tower, a wall-mounted TV, or a theater display.

In general, a plasma display panel is a display device using visible light emitted by irradiating ultraviolet light generated by discharge of an inert gas enclosed in a discharge cell to a phosphor.

1 is a perspective view illustrating a cell structure which is typically arranged in a matrix form on an AC plasma display panel.

Referring to FIG. 1, a plasma display panel includes an upper plate having upper electrodes 14 and 16, an upper dielectric layer 18, and a passivation layer 20 sequentially formed on an upper substrate 10, and an upper substrate 12. A lower plate having an address electrode 22, a lower dielectric layer 24, a partition wall 26, and a phosphor layer 28 formed sequentially on the substrate. At this time, the upper substrate 10 and the lower substrate 12 are spaced apart in parallel by the partition wall (26).

Each of the upper electrodes 14 and 16 has a relatively wide width and has transparent electrodes 14A and 16A made of transparent electrode material (ITO) for visible transmission, and has a relatively narrow width and transparent electrodes 14A and 16A. It consists of metal electrodes 14B and 16B for compensating for the resistive component. The upper electrode includes a scan electrode 14 and a sustain electrode 16 according to a pulse applied thereto. The scan pulse for panel scanning and the sustain pulse for sustaining discharge are mainly supplied to the scan electrode 14, and the sustain pulse is mainly supplied to the sustain electrode 16.

Charges are accumulated in the upper dielectric layer 18 and the lower dielectric layer 24 during discharge.

The protective film 20 prevents damage to the upper dielectric layer 18 by sputtering, thereby increasing the lifetime of the PDP and increasing the emission efficiency of secondary electrons. As the protective film 20, magnesium oxide (Ago) is usually used.

The address electrode 22 is formed to cross the upper electrodes 14 and 16. The address electrode 22 is supplied with a data pulse for selecting cells to be displayed.

The partition wall 26 is formed in parallel with the address electrode 22 to prevent ultraviolet rays generated by the discharge from leaking to adjacent cells.

The phosphor layer 28 is applied to the surfaces of the lower dielectric layer 24 and the partition wall 26 to generate visible light of any one of red, green, and blue.

Then, an inert gas for gas discharge is injected into the discharge space therein.

In the plasma display panel configured as described above, the partition wall has a stripe type, a closed type, a fish bone type, or the like, depending on its formation structure.

The barrier rib of the stripe structure refers to the formation of the barrier rib in parallel with the address electrode, and the barrier rib of the closed structure means that the barrier ribs are formed between adjacent discharge spaces so that each barrier rib space is partitioned. The partition 26 of the structure is made of a combination of the stripe structure and the closed structure, and refers to the alternate formation of the wide partition 26a and the narrow partition 26b at regular intervals as shown in FIG. 2. do. The upper electrodes 14 and 16 are disposed at portions of the fishbone type partition wall 26 that face the wide partition wall. As a result, the discharge space is formed by the adjacent narrow partition walls 26b. At this time, the phosphor is applied not only to the narrow barrier rib 26b but also to the inner surface of the protruding inclined surface of the wide barrier rib 26a in the discharge space, thereby increasing the coating area of the phosphor, thereby improving luminous efficiency.

On the other hand, it is classified into a sand blast method, a screen printing method, an etching method and the like according to the method of manufacturing the partition wall.

The fishbone barrier may be manufactured using one of sandblasting, screen printing, or etching.

3A to 3F are views for explaining a method of manufacturing a partition of a fishbone structure using a sandblasting method.

First, the barrier rib forming paste 33 is applied, printed or coated to have a predetermined height on the lower substrate 31 on which the address electrode (not shown) and the lower dielectric layer 32 are formed (FIG. 3A). In this case, the address electrode may be formed on the surface of the lower substrate 31 between the lower dielectric layer 32 and the lower substrate 31.

Subsequently, a dry film resist (DFR: Dry Film Resist) is formed on the partition forming paste 33 by using a laminating technique, and then the dry film resist is patterned through an exposure and development process. patterning) to form a dry film resist pattern 34 having a fishbone structure (FIG. 3B).

Then, a sand blast is performed using the dry film resist pattern 34 as a mask to form a partition 33a (FIG. 3C).

When the barrier rib 33a is formed, the dry film resist pattern 34 is peeled off by a wet process using a stripping solution, that is, an aqueous alkali solution such as NaOH, and then dried for a predetermined time (FIG. 3D).

Next, the partition 33a formed on the glass substrate 21 is baked (FIG. 3E).

As described above, the partition wall of the fishbone-type structure can be manufactured using the sandblasting method, and the firing process is essentially used to reinforce the partition wall.

However, when the fishbone partition wall is manufactured through a predetermined process, as illustrated in FIG. 4, the upper center portion of the wide partition wall 26a of FIG. 2 is recessed downward in the fishbone partition wall. As the central portion of the wide barrier rib 26a is recessed, the upper edge portion of the wide barrier rib 26a protrudes relatively upward.

This is because, as shown in Fig. 5a and 5b, the shrinkage ratio is different depending on the width of the partition wall. Arrows in FIG. 5A and FIG. 5B indicate plastic shrinkage force. At this time, the plastic shrinkage force acts less as the upper width of the partition narrows, and acts as the upper height wider.

As shown in FIG. 5B, in the case of the narrow partition wall 26b, since the upper width of the partition wall is very narrow, uniform force is received in the left and right directions during the firing process so that the center portion of the upper part of the narrow partition wall 26b is not recessed. Will not. Moreover, since the upper width of the narrow partition wall 26b is very narrow, the possibility of sinking becomes even thinner.

On the contrary, as shown in FIG. 5A, in the case of the wide partition 26a, the width of the upper portion is several times larger than the width of the narrow partition 26b, so that the upper middle portion is likely to be recessed downward. .

In addition, in the case of the wide partition 26a, the plastic shrinkage force is relatively larger than the partition 26b having a narrow plastic shrinkage force in the left and right directions and the upper direction by a predetermined process. Accordingly, shrinkage occurs from the inner surface and the upper surface of the wide partition 26a.

As shown in FIG. 5A, the wide partition 26a has a lower width than the upper portion.

Therefore, the inner surface of the wide partition 26a having a large area is contracted from the lower side. At this time, the lower inner surface of the wide partition 26a has a dense structure in which density is strengthened by shrinkage, whereas the lower central portion has a plasticity. The contracting force does not reach, and the porous structure becomes porous. In this case, the plastic shrinkage force is applied to the upper surface of the wide bulkhead in the downward direction from the upper direction. The plastic shrinkage force acts as the lower center of the porous structure so that the upper surface of the wide partition 26a is recessed downward. Will be.

That is, as shown in FIG. 5B, in the case of the narrow partition wall 26b, the narrow contraction force extends to the inside in a narrow relationship, and thus the dense structure is also inside, so that the upper surface of the narrow partition wall 26b is recessed downward. However, as shown in FIG. 5A, in the case of the wide partition 26a, the width becomes wider, so that the plastic shrinkage force does not work until the inside, thereby forming a porous structure instead of a dense structure, and thus the wide partition 26a. The top surface of the cavities will be recessed downward.

Accordingly, in the case of a wide partition, the upper edge portion protrudes and the center portion is recessed to lower the upper roughness.

As such, when the lower substrate having the upper surface recessed downward, that is, the lower substrate having the partition with the upper edge portion protruding therefrom is joined with the upper substrate, the edge portion of the wide partition wall is contacted by the large pressure of the upper substrate. There is a problem that the edge portion is broken or collapsed. The cracked or collapsed debris adheres to the inner surface of the partition or the lower dielectric layer, thereby degrading the brightness, luminous efficiency, and the like.

Accordingly, the present invention has been made to solve the above problems, the plasma display panel partition wall that can improve the upper roughness of the partition of the fishbone type structure to prevent the degradation of the brightness and luminous efficiency due to the collapse of the partition wall and The purpose is to provide a method for producing the same.

According to a first preferred embodiment of the present invention for achieving the above object, the partition for the plasma display panel is arranged in a stripe shape, each partition wall is alternately connected to the narrow partition and the wide partition along the long direction of the stripe form. It is made of a fishbone-type structure, the wide partition is formed by dividing into two or more sub partitions having a predetermined depth.

According to a second preferred embodiment of the present invention, a method for manufacturing a partition wall for a plasma display panel includes a) applying and drying a partition wall forming paste on a substrate provided on a lower plate; b) forming a dry film resist pattern on the applied and dried barrier rib forming paste, wherein the patterned dry resist is alternated from an upper center width of the wide barrier rib in a fishbone type structure in which a narrow barrier rib and a wide barrier rib are alternately connected. Patterned to form a predetermined depth in the direction; c) forming a barrier rib having the narrow barrier rib and the wide barrier rib from the barrier rib forming paste using the dry film resist pattern as a mask; And d) firing the formed partition wall.

According to the first and second embodiments of the present invention, the predetermined depth may be in the range of 0.4 to 0.7 times the height of the wide partition.

According to the first and second embodiments of the present invention, the upper center width may be in the range of 0.5 to 1.1 times the upper width of the narrow partition wall.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

The present invention is formed so that the central portion of the wide partition wall is recessed through a process similar to that of manufacturing a fishbone partition wall using a conventional sandblasting method.

However, in the present invention, when patterning the dry film resist to form a structure in which the central portion of the wide barrier rib is recessed, the portion not formed as the barrier rib and the center width portion of the wide barrier rib are patterned. That is, the patterned dry film resist is patterned so that the portion not formed as a partition and the central width portion of the wide partition are protected without being removed during sanding. Here, the dry film resist is preferably patterned to correspond to a portion which is not formed as a partition wall in consideration of a fishbone type structure in which a wide partition wall and a narrow partition wall are alternately connected. That is, the portion corresponding to the portion not formed as the partition wall between the adjacent large partition walls should be narrowly patterned, and the portion corresponding to the portion not formed as the partition wall between the narrow partition walls adjacent to each other should be widely patterned.

The partition wall as shown in FIGS. 6 and 7 may be formed by sandblasting using the patterned dry film resist as a mask. Here, the formed partition wall includes both a wide partition wall and a narrow partition wall.

6 is a cross-sectional view of a wide partition wall in a partition of a fishbone structure of a plasma display panel according to an exemplary embodiment of the present invention. FIG. 7 shows a plan view of the wide partition of FIG. 6.

6 and 7, when sand blasting is performed using the patterned dry film resist as a mask, a partition forming paste corresponding to a portion which is not formed as a partition (both wide and narrow partitions) and The partition forming paste corresponding to the central width portion of the wide partition is simultaneously sanded. Here, sanding corresponds to portions (eg, portions not formed by partition walls and center width portions of wide partition walls) which are not protected by the patterned dry resist by an abrasive sprayed through a sand blast spray nozzle or the like. It means to physically remove the partition forming paste.

Thus, when the partition formation paste corresponding to the portion not formed by the partition and the partition formation paste corresponding to the center width portion of the wide partition are simultaneously removed, the partition formation corresponding to the portion not formed by the partition occupying the wide area is formed. While the paste is relatively sanded, the partition forming paste corresponding to the center width portion of the wide partition wall occupying a narrow area is relatively difficult to sand. Accordingly, when sanding is performed until the lower dielectric layer 40 is exposed in a portion where the barrier ribs are not formed, sanding is performed by a predetermined sanding depth in the central width portion of the wide barrier rib. That is, the sanding depth of the central width W2 portion of the wide partition wall 42 may be about the middle of the height of the wide partition wall 42. If this is set to approximately the range, the sanding depth of the central width W2 portion of the wide partition wall 42 is preferably in the range of 0.4 to 0.7 times the height h of the wide partition wall 42. Outside this range, the central portion of the wide partition 42 may be recessed or the sub partitions 42a and 42b of the wide partition 42 may be narrowed and collapsed. For example, when the sanding depth of the center width W2 portion of the wide partition wall 42 becomes 0.7 times or more of the height h of the wide partition wall 42, the sub partition walls 42a and 42b of the wide partition wall 42 collapse. Can be. When sanding is performed by sandblasting, etching is performed not only in the vertical direction but also in the vertical direction. In this case, when sanding is continuously performed in the vertical direction of the wide partition 42, sanding is also performed in the horizontal direction of the wide partition 42. Therefore, as the sanding proceeds, the sub barrier ribs 42a and 42b of the wide barrier rib 42 become narrower and are likely to collapse. Therefore, it is preferable that the sanding depth of the center width W2 of the wide partition 42 is not more than 0.7 times the height h of the wide partition 42. Further, the center width W2 of the wide partition 42 is preferred. When the sanding depth of the portion becomes 0.4 times or less of the height h of the wide partition 42, the sanding depth is not deep and there is no sanding effect. In this case, since the inside of the wide partition 42 is still kept in a porous state, it is highly likely that the center width W2 portion of the wide partition 42 is recessed in the downward direction during the firing process. Therefore, the sanding depth of the center width W2 of the wide partition wall 42 is preferably 0.4 times or less of the height h of the wide partition wall 42.

The wide partition 42 formed by sanding is divided into two sub partitions 42a and 42b by a predetermined sanding depth. If necessary, it can be divided into several sub bulkheads.

As a result, during firing, the upper and lower portions of the wide bulkhead have the same shrinkage ratio, so that the central surface of the upper portion is not recessed downward.

Finally, the partition walls (wide partition walls and narrow partition walls) formed by sanding are completed by the firing process.

As shown in FIG. 6, when the partition wall is fired, as described above, the plastic shrinkage force acts in the left and right directions and the upward direction of the wide partition wall 42. At this time, since the portion of the center width W2 of the wide partition 42 is sanded to a predetermined sanding depth, the center wall W2 is also acted in the left and right directions through the surrounding space of the sanding depth. Accordingly, the plastic shrinkage force is applied to each of the divided sub barrier ribs 42a and 42b in the left and right directions, respectively.

Accordingly, the divided sub-barriers 42a are simultaneously subjected to the plastic shrinkage force from the left and the right, and are contracted from the side portions to form a dense structure. That is, since the upper width W3 of the sub barrier rib 42a is narrow like the upper width W1 of the narrow barrier rib, it becomes a dense structure over the entire area of the interior. As described above, since the dense structure is already formed over the entire inner region of the sub barrier rib 42a, the upper surface of the sub barrier rib 42a is caused by a plastic shrinkage force acting downward from the upper edge of the sub barrier rib 42a. The central part of is not depressed.

For this reason, since the entire inner area of the other divided sub barrier ribs 42b also has a dense structure, the upper width W4 of the other divided sub barrier ribs 42b is not recessed.

Therefore, the upper surface state of each of the sub barrier ribs 42a and 42b is uniformly formed without a difference in height, so that the roughness can be improved.

At this time, as shown in FIG. 7, the upper widths W3 and W4 of the respective sub partitions 42a and 42b of the wide partition 42 are preferably the same.

In addition, the center width W2 defined by the gap between the upper widths W3 and W4 of the sub-border walls 42a and 42b is in a range of 0.5 to 1.1 times the upper width W1 of the narrow partition wall 41. It is preferable. When the center width W2 becomes too wide, that is, when the center width W2 becomes 1.1 times or more than the upper width W1 of the narrow partition 41, the upper width W3 of each sub partition 42a, 42b If W4) becomes narrow and the upper part of the wide partition 42 is inconvenient, it may collapse, and if the center width W2 is too narrow, that is, the center width W2 is the upper width W1 of the narrow partition 41. If it is less than 0.5 times of the predetermined sanding depth is not formed, there is a possibility that a porous structure occurs on the lower inner surface of the wide partition 42. This range is not only vertical but also horizontal in the sand blasting process as described above The etching proceeds in the direction as well. Of course, the optimum range should be confirmed through experiments, but it is expected that the effects of the present invention can be attained as much as possible in the above-mentioned range through physical analysis.

Therefore, the center width W2 may be designed in consideration of the sanding depth of the center width portion during sanding.

As described above, according to the present invention, by dividing the wide partition wall to have a center width at the time of sanding and sanding to a predetermined depth, the interior of the partition wall partitioned during firing is all dense structure and roughness to the upper surface of the partitioned partition wall Will be improved.

Accordingly, when the upper substrate is bonded to the upper substrate, there is no fear of breaking or collapsing the large partition wall due to the uniform surface roughness, and further, the foreign matters of the upper partition of the wide partition wall do not escape and contaminate the discharge space, thereby improving brightness and luminous efficiency. Can be.

1 is a perspective view showing a cell structure which is typically arranged in a matrix form on the AC plasma display panel.

2 is a plan view of a partition of a conventional fishbone structure.

3A to 3F are views for explaining a method of manufacturing a partition of a fishbone structure using a sand blast method in the related art.

4 is a view showing that the center portion is recessed in the partition of the conventional fishbone structure.

5A and 5B are cross-sectional views of a partition of a conventional fishbone structure.

6 is a cross-sectional view of a wide partition wall in a partition of a fishbone structure of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 7 is a plan view of the wide bulkhead of FIG. 6. FIG.

<Name of the code for the main part of the drawing>

40: lower dielectric layer 41: narrow partition wall

42: wide bulkhead 42a, 42b: sub bulkhead

Claims (12)

In the plasma display panel comprising a top plate composed of an upper electrode, a first dielectric layer and a protective layer, and a bottom plate composed of an address electrode, a second dielectric layer, a partition wall, and a phosphor layer, The barrier ribs are arranged in a stripe shape, and each barrier rib is formed of a fishbone structure in which narrow barrier ribs and a wide barrier rib are alternately formed along the longitudinal direction of the stripe shape, and the wide barrier rib is divided into two or more sub barrier ribs having a predetermined depth. Plasma display panel partition wall characterized in that it is formed. The partition wall for plasma display panel according to claim 1, wherein the predetermined depth is in a range of 0.4 to 0.7 times the height of the wide partition wall. The partition wall for plasma display panel of claim 1, wherein the upper center width is in a range of 0.5 to 1.1 times the upper width of the narrow partition wall. The barrier rib of claim 1, wherein the at least two sub barrier ribs have the same upper width. In the plasma display panel comprising a top plate composed of an upper electrode, a first dielectric layer and a protective layer, and a bottom plate composed of an address electrode, a second dielectric layer, a partition wall, and a phosphor layer, a) applying and drying a barrier forming paste on a substrate provided on the lower plate; b) forming a dry film resist pattern on the applied and dried barrier rib forming paste, wherein the patterned dry resist is alternated from an upper center width of the wide barrier rib in a fishbone type structure in which a narrow barrier rib and a wide barrier rib are alternately connected. Patterned to form a predetermined depth in the direction; c) forming a barrier rib having the narrow barrier rib and the wide barrier rib from the barrier rib forming paste using the dry film resist pattern as a mask; And d) firing the formed partition wall Plasma display panel manufacturing method comprising a. 6. The method of claim 5, wherein the patterned dry resist is patterned to correspond to the upper center width. 6. The method of claim 5, wherein the wide barrier rib is divided into at least two sub barrier ribs by a predetermined depth formed from an upper center width. The method of claim 7, wherein a plastic shrinkage ratio of the divided sub barrier ribs is maintained to be the same. The method of claim 5, wherein the predetermined depth is in the range of 0.4 to 0.7 times the height of the wide partition. 6. The method of claim 5, wherein the upper center width is in a range of 0.5 to 1.1 times the upper width of the narrow partition wall. The method of claim 7, wherein the divided sub barrier ribs have the same upper width. The method of claim 5, wherein the partition wall is formed by a sand blasting method.