JP2008097957A - Plasma display panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP equipped with barrier ribs formed with accuracy and capable of restraining differences in emission intensity among discharge spaces. <P>SOLUTION: In the plasma display panel 10 with a pair of substrates 11, 21 arranged in opposition with an interposition of the barrier ribs and making up discharge spaces 3 by spaces surrounded by the barrier ribs and both the substrates 11, 21, the barrier ribs 24 are structured by assembling a plurality of columnar members with insulation properties in stripes or in crossing on one of the substrates 21, and a part of the plurality of columnar members is structured to be in a different thickness from those of the rest of the columnar members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a configuration of a plasma display panel, and more particularly to a configuration of barrier ribs and phosphor layers.

A plasma display panel (hereinafter referred to as “PDP”) is a video display device that is widely used in the television field and the like. There are a direct current (DC) type and an alternating current (AC) type of PDP. The AC type is known to be suitable for high-speed driving and a large screen, and has become mainstream.
The structure of the AC type PDP is generally as shown in the developed perspective view of FIG. A front panel 910 and a back panel 920 are arranged to face each other, and a plurality of pairs of display electrodes 912 disposed on the front substrate 911 and a data electrode 922 disposed on the back substrate 921 intersect. A discharge space 930 is interposed between the front panel 910 and the back panel 920, and the discharge space 930 is in a state of being divided into a matrix by partition walls 924 as illustrated. In each divided discharge space 930, a discharge is generated by the display electrode 912 to which a voltage is applied, and ultraviolet rays are generated. The generated ultraviolet light becomes visible light by the phosphor layer 925 formed in the discharge cell 930 and is emitted to the front panel 910 side.

With respect to such an AC type PDP, improvement in display performance due to high definition and the like is required every day. For example, when high definition is achieved in the PDP 900, the number of discharge spaces 930 that are divided increases as the number of electrodes increases. With Figure 10 shows a cross-sectional view of a virtual plane A (b), if the panel size is identical discharge spaces 930 is micronized, also decreases its pitch size W _C. When the progress of the miniaturization causes the formation region of the partition wall 924 and the formation region of the data electrode 922 to overlap (in the drawing, the length of Wa is 0 or less), the electric energy density distribution at the time of voltage application The panel voltage characteristics vary. In addition, since the discharge region becomes small, the light emission efficiency is lowered or the discharge voltage is increased.

One approach to improve these have finer thickness W _R of the partition wall 924. As a method for forming the partition wall 924, a sand blasting method, a screen printing method, or the like is known. In these methods, the formation accuracy of the partition wall 924 is improved. Furthermore, the equalization of the height of the partition 924 is also achieved by using a molding mold as in Patent Document 1.
JP 2003-123640 A

However, even if the conventional technique such as Patent Document 1 is used, the following problem may occur with respect to improvement in display performance due to further miniaturization of the discharge space.
First, in the above-described general formation method relating to the partition walls, a formation error may occur with respect to the shape of the plurality of partition walls. Further, as the discharge space is further miniaturized, the difficulty in forming fine barrier ribs at minute intervals increases. Therefore, when the barrier rib formation error is not improved, even if the discharge space is miniaturized, there is a risk that the display performance varies greatly due to the error. Specifically, in the case of a PDP having a partition wall having a formation error of the same level as in the past, the discharge space is made smaller than in the past, so that the light emission efficiency in each discharge space in the PDP and the desired light emission The difference with efficiency becomes large. That is, the effect that should be obtained based on the increase in the number of discharge space sections is greatly reduced.

  Secondly, there is a problem regarding the relative visibility for the user's color. Although three types of phosphor layers are mainly used in PDP, even if light is emitted in a discharge space of the same scale, depending on the color of the phosphor layer formed in the discharge space, other discharge spaces may be used. There is a difference in the relative luminous sensitivity of the user with respect to the color emitted by. For this reason, the shape accuracy of the barrier ribs can be improved, and even if the barrier ribs having a uniform shape are formed for each discharge space, there is a possibility that the user's relative visibility with respect to the emission color may vary, and the display performance may be reduced. There is still room for improvement.

The above-described conventional method relating to the formation of barrier ribs is mainly to integrally mold the entire barrier ribs on the dielectric layer, and in order to solve the second problem, the phosphor layers of the respective colors are formed. Changing the forming method and forming conditions locally for each portion corresponding to the discharge space is accompanied by a change in the mask and the like, which increases the manufacturing cost.
This invention is made | formed in view of the above subject, Comprising: While providing the partition formed accurately, it aims at providing PDP which can suppress the difference in a user's specific visual sensitivity.

In order to solve the above problems, the PDP according to the present invention has the following configuration.
A plasma display panel in which a pair of substrates are arranged to face each other with a partition wall, and a space surrounded by the partition wall and the two substrates is a discharge space, and the partition wall includes a plurality of insulating columnar members, A part of the plurality of columnar members has a thickness different from that of the remaining columnar members. The “thickness” of the columnar member means the length in the direction of the plane of the substrate and perpendicular to the extending direction of the partition walls.

  The partition wall is formed by assembling the plurality of columnar members in a cross shape or a stripe shape. For example, in the case where the barrier ribs have a grid pattern so as to partition each discharge space from the adjacent discharge space, it is assumed that one discharge space is surrounded by four columnar members from four directions. Further, it is assumed that the thickness of the columnar member is determined according to the emission color in the discharge space. In addition, a first phosphor layer is formed in advance on the main surface of the columnar member, and on the other hand, a dielectric layer is formed on the substrate on which the columnar member is assembled, and the dielectric layer is formed on the surface of the dielectric layer. Suppose that the 2nd fluorescent substance layer is previously formed in the part except the assembly position. In particular, the first phosphor layer and the second phosphor layer are at least one of three types of phosphor layers of green, blue, and red, and a boundary portion between the discharge space adjacent to the first discharge space. The thickness of the columnar member is determined according to the combination of the columnar member and the first phosphor layer.

  Of the plurality of columnar members, the columnar members assembled in a row in the first direction have phosphor layers of different colors on one main surface and the other main surface. At this time, in the columnar members assembled in a row in the first direction, the combinations of the phosphor layers formed on the one main surface and the other main surface are red and green, green and blue, Blue and red are preferred. In addition, the thickness of the columnar member in which the phosphor layers are combined is the thickest among the combinations, the columnar member in which red and green are combined, and the columnar member in which the combination of blue and red is combined The thinnest configuration is preferred. In addition, among the plurality of columnar members, the columnar members assembled in a row in the second direction intersecting the first direction have the same color fluorescence on one main surface and the other main surface. It can also be set as the structure by which the body layer was formed.

Next, the barrier rib has a stripe shape that partitions the discharge cell group arranged in the row or column direction from the adjacent discharge cell group, and corresponds to each discharge cell in one discharge cell group. It can also be set as the structure which has the structure by which the member was assembled | attached.
The cell pitch interval of the discharge spaces divided by the barrier ribs is preferably the same as the cell pitch interval of the adjacent discharge spaces. Furthermore, it is desirable that a dielectric layer is formed on the one substrate, the dielectric layer has a groove, and each of the plurality of columnar members is fitted into the groove.

The following method is adopted as the following manufacturing method for the PDP having the above configuration.
A method of manufacturing a plasma display panel in which a pair of substrates are arranged opposite to each other with a partition wall, and a space surrounded by the partition wall and both substrates is a discharge space, and a plurality of insulating columnar members are disposed on one substrate As a plurality of columnar members, some of the columnar members are different in thickness from the remaining columnar members.

  For example, when forming the barrier ribs, the plurality of columnar members are assembled in a cross pattern so that each discharge space is separated from the adjacent discharge space, and one discharge space is surrounded by four columnar members from four sides. Make the configuration. Therefore, it is desirable to determine the thickness of the columnar member according to the emission color in the discharge space. And performing the assembly of the columnar member on the dielectric layer formed on the one substrate, and forming the dielectric layer on the one substrate before the assembly of the columnar member; Preferably, the method includes a step of forming a first phosphor layer on the main surface of the substrate and a step of forming a second phosphor layer on a portion of the dielectric layer excluding a position where the columnar member is to be assembled.

Among them, the first phosphor layer and the second phosphor layer use at least one of three kinds of phosphor layers of green, blue, and red, and in the thickness direction of the columnar member, The four columnar members that surround the four sides are assembled so that the length from the boundary between the discharge space and the adjacent discharge space to the end of the columnar member is substantially equal.
Furthermore, it is desirable to form a groove portion at a position where the columnar member is to be assembled in the dielectric layer before assembling the columnar member, and to assemble the columnar member by fitting the columnar member into the groove portion. .

  In the above steps, it is desirable that the columnar members are assembled in order from the thickest columnar member among the plurality of columnar members. Further, as one of the methods described above, a method of assembling the plurality of columnar members using an in-liquid self-mounting process can be used in assembling the columnar members.

  Since the partition wall according to the present invention has a configuration in which a plurality of columnar members are assembled on a substrate, the partition wall according to the present invention is manufactured by processing the partition wall on the substrate by a sandblasting method, a printing method, or the like. Instead, it may be assembled using a columnar member molded in advance before assembly. In the case of the present invention, since a plurality of columnar members already formed before assembly are used, a partition wall formed with high accuracy can be easily obtained. Therefore, even if the discharge space is further miniaturized, it is possible to realize an accurate partition wall shape.

  Thereby, the magnitude | size of each discharge space partitioned off with a partition can be formed in a desired magnitude | size. Further, in the configuration according to the present invention, since the plurality of columnar members include columnar members having different thicknesses, even if the size of the discharge space based on the arrangement of the barrier ribs is the same, The size (volume) of the discharge region contributing to the discharge can be changed. Based on the difference in the user's relative luminous sensitivity with respect to the luminescent color in each discharge space, the difference in the relative luminous sensitivity for each color can be suppressed by appropriately configuring the partition so as to be a discharge area having a predetermined volume. That is, only by assembling the columnar members having different thicknesses as described above, it is possible to easily suppress the difference in the relative luminous sensitivity associated with each color without arranging the data electrodes and controlling the applied voltage.

Moreover, if it is the structure of the partition concerning this invention, it can respond to various shapes, such as a cross shape and stripe shape, providing the effect mentioned above.
For example, in the case where the partition walls are in the form of a cross beam, the size of each discharge space can be adjusted as appropriate by adopting a configuration in which each discharge space is surrounded by four columnar members. In addition, for example, during the PDP manufacturing process, it becomes easy to appropriately cope with a case where partial correction or change is required in the configuration or the like of the discharge space.

Further, if the thickness of the columnar member is determined according to the emission color in the discharge space, the volume in the discharge space for emitting each color can be made uniform for each color.
Further, if the first phosphor layer is formed in advance on the main surface of the columnar member and the second phosphor layer is formed in advance on a predetermined portion of the dielectric layer, the columnar member and the dielectric layer are collectively formed. Thus, the structure is different from the structure in which the phosphor layer is formed. That is, since the columnar member and the dielectric layer are individually formed in desired portions, a discharge space including a phosphor layer formed in a necessary portion with a necessary thickness or the like can be obtained. Therefore, the discharge efficiency for each discharge space is improved, and the variation in display performance is suppressed.

In particular, since the thickness of the columnar member from the area with the adjacent discharge space is defined for each discharge space of each color, it is possible to adjust the user's relative visibility for each color emitted from each discharge space. In addition, even in the case of adjusting the light emission amount contributing to the relative visibility for each position of the discharge space, it can be appropriately adjusted based on the thickness of the columnar member to be assembled.
In addition, as a partition extending in the first direction, a columnar member in which a phosphor layer of a different color is formed on each main surface is assembled in a column, so that discharges arranged in a row or column direction In the cell group, the setting conditions can be appropriately changed for each discharge cell. Furthermore, if the combination of colors of the phosphor layers to be formed is as described above, a discharge cell group in which the emission colors are specifically arranged in the order of red, green, and blue can be formed with the same effect. Particularly, among the phosphor layers of the above combination, if the thickness of the columnar member having the combination of red and green is the thickest, and the thickness of the columnar member having the combination of blue and red is the thinnest, adjacent discharge spaces The volume of the discharge space in which the green phosphor layer is formed can be minimized and the volume of the discharge space in which the blue phosphor layer is formed can be maximized. This is preferable because the relative visibility of the user is generally the strongest in green and the weakest in blue, so that variations in display performance based on this difference can be suppressed.

  On the other hand, in the discharge cell group aligned in the row or column direction, columnar members each having the same color phosphor layer formed on each main surface as a partition extending in the second direction are assembled in a column. Furthermore, it is possible to appropriately correspond to the conditions of the discharge cells individually divided. In addition, for each discharge space, the four surfaces of the columnar member and the one surface of the dielectric layer contribute to light emission, which can contribute to the improvement of the light emission efficiency. Moreover, even if the partition wall has a stripe shape extending in one direction, the display performance is improved as compared with the conventional structure by having the structure composed of the plurality of columnar members and the structure composed of the columnar members having different thicknesses. Can be realized.

Furthermore, if the groove portion is formed in the portion where the columnar member is incorporated in the dielectric layer, the structure in which the columnar member is fitted into the groove portion increases the strength of assembling the columnar member. preferable.
With respect to a method of manufacturing a PDP having a partition wall having such a configuration, the following effects can be obtained.
In this invention, when forming a partition, the columnar member shape | molded previously is used. Therefore, even when the discharge space is further miniaturized, the formation accuracy is improved by assembling the columnar member as compared with the case where the partition walls are processed on the substrate using a sandblasting method, a printing method, or the like. A PDP having a partition wall can be manufactured. Specifically, in the case of the conventional technique such as the above method, it is difficult to form a partition having a precise shape corresponding to a minute discharge space. In particular, when the discharge space is further miniaturized, the influence of the formation error of the fine-shaped partition walls on the fine discharge space becomes larger than before, and the display performance varies from discharge space to discharge space. For this reason, it is difficult to improve sufficient display performance. However, if the columnar member is formed in a separate step as in the method according to the present invention, a fine partition that appropriately corresponds to a minute discharge space can be formed simply by assembling the columnar member.

  Furthermore, since the thickness of the partition wall can be adjusted as appropriate by assembling columnar members having different thicknesses as in the present invention, it is possible to easily manufacture a PDP having a precise shape and an appropriately adjusted discharge space volume. . In particular, in order to locally change the thickness of the partition wall, the manufacturing process becomes complicated if the above-described conventional manufacturing method is used, but if it is the above-described method, it can be achieved only by using columnar members having different thicknesses. It is also superior in terms of manufacturing costs.

Further, if the thickness of the columnar member is defined according to the emission color of the discharge space, the volume of the discharge space for each color can be easily set, and a dielectric layer is formed on one substrate. If the method of forming the first and second phosphor layers on the columnar member and the dielectric layer before assembling the columnar member is employed, each phosphor layer forms a phosphor layer in a concave microspace. There is no need. That is, since it performs separately with respect to the columnar member before an assembly | attachment and the dielectric material layer before an assembly | attachment of a columnar member, it can form easily by desired thickness etc. in a desired range.

In addition, it is preferable that a groove is formed in advance in the assembly portion of the columnar member in the dielectric layer because the standing state of the columnar member can be secured by fitting the columnar member into the groove.
Furthermore, if the above-mentioned fitting is performed in order of increasing thickness of the columnar member, the columnar member can be fitted only in the groove portion of a predetermined size, so that an assembly error of the columnar member can be prevented.
If a so-called self-mounting process in liquid is used for assembling the columnar members, a plurality of columnar members can be easily assembled at predetermined positions.

Hereinafter, an embodiment using an AC type PDP apparatus as an example for illustrating the features of the present invention will be described with reference to the drawings.
1. Overall Configuration FIG. 1A is an exploded perspective view of a main part of a PDP 10 according to the present embodiment. The PDP 10 includes a front panel 1 and a rear panel 2 that are arranged to face each other with a discharge space 3 interposed therebetween.
(1) Front panel 1
In the front panel 1, display electrode pairs 12 are disposed on a front substrate 11, and a dielectric layer 13 and a protective layer 14 are sequentially laminated so as to cover them.

The front substrate 11 is made of, for example, borosilicate alkaline earth glass, soda lime glass, high strain point glass of about 570 ° C., and has a thickness of about 2.8 mm.
The display electrode pair 12 includes a scan electrode (Scn) and a sustain electrode (Sus). In both Scn and Sus, a plurality of pairs of transparent electrodes 121 and 122 are formed in a stripe shape, and bus electrodes 123 and 124 for lowering the resistance of the transparent electrodes 121 and 122 are laminated. The transparent electrodes 121 and 122 are mainly composed of ITO (Indium Tin Oxide), tin oxide or zinc oxide, and have a thickness of 0.1 μm and a width of 150 μm. The bus electrodes 123 and 124 are mainly composed of silver, have a thickness of 2 to 10 μm and a width of 35 μm. A configuration without the transparent electrodes 121 and 122a is also applicable. As for the bus electrodes 123 and 124, a thin film (thickness of 0.1 to 1.0 μm) containing copper or aluminum as a main component in addition to silver, or a thin film (thickness 0. 1 to 1.0 μm) is also applicable. The display electrode pair 12 contributes to the generation of discharge in the discharge space 3 to be described later by a voltage applied from an external drive circuit (not shown).

The dielectric layer 13 is provided to protect the display electrode pair 12 and is formed using lead oxide or bismuth oxide-based low melting glass as its material.
The protective layer 4 is provided to protect the dielectric layer 13 from collision of ions mainly caused by discharge. For example, the protective layer 4 is mainly composed of magnesium oxide, calcium oxide, strontium oxide, barium oxide, etc. It is formed with a thickness of 1.0 μm.

Although not shown, a black stripe that shields light from the discharge space 3 may be provided between the adjacent display electrode pairs 12. Examples of black stripe materials include solid resin such as lead borosilicate glass powder and bismuth / phosphoric acid mixture, and black pigments such as chromium-manganese-copper pigments and iron-cobalt-chromium pigments. Can be used. As the resin, for example, a resin obtained by dissolving ethyl cellulose in a solvent can be used.
(2) Rear panel 2
In the rear panel 2, the data electrodes 22 are arranged in a stripe pattern on the rear substrate 21, a dielectric layer 23 is formed to cover them, and a partition wall 24 is formed. The partition panel 24 and the dielectric layer 23 are formed. A phosphor layer 25 is formed in the recess. The data electrode 22 is disposed in a direction crossing the display electrode pair 12.

The back substrate 21 is made of a glass material such as borosilicate alkaline earth glass, like the front substrate 11, and has a thickness of about 2.8 mm.
The data electrode 22 is made of silver and has a thickness of 2 to 10 μm and a width of 50 to 60 μm. This is not only silver, but also a thin film (thickness 0.1 to 1.0 μm) mainly composed of copper, aluminum, etc., a thin film (thickness 0.1 to 1.0 μm) made of a laminated film of chromium / copper / chrome, etc. Is also applicable.

The dielectric layer 23 protects the data electrode 22 and is made of an oxide glass containing zinc oxide or bismuth oxide and has a thickness of 8 to 15 μm. On the main surface of the dielectric layer 123 on the front panel side (positive side in the Z direction), a groove is formed in a portion corresponding to the region where the partition wall 24 is provided.
The barrier ribs 24 have a cross beam shape in which the first barrier ribs 241 positioned between the adjacent data electrodes 22 and the second barrier ribs 242 positioned between the adjacent display electrode pairs 12 are combined. As shown in FIG. 1A, the partition wall 24 is not integrally molded, and both the first partition wall 241 and the second partition wall 242 are columnar partition wall constituent members (hereinafter simply referred to as “ "Columnar member") is assembled. The shape and arrangement position of the columnar member will be described later. The partition wall 24 prevents erroneous discharge and optical crosstalk in the Y direction. The shape of the partition wall 24 is not limited to the above-mentioned cross-girder shape, but may be other shapes such as a stripe shape.

The phosphor layer 25 has three kinds of phosphor layers of red, green, and blue, and ultraviolet rays generated by the discharge excite the phosphor layer 25 and have a corresponding color in each of the divided discharge spaces. Visible light is emitted. As a material of the red phosphor layer, for example, (Y, Gd) BO ₃ : Eu, as a material of the green phosphor layer, for example, Zn ₂ SiO ₄ : Mn, as a material of the blue phosphor layer, for example, BaMgAl ₁₀ O ₁₇ : Eu can be used. The phosphor layer 25 is laid on the partition wall 24 and the dielectric layer 23 in each of the discharge spaces 3, but is not integrally formed in the discharge space 3, as shown in FIG. The barrier ribs 24 and the dielectric layer 23 are individually laid. These arrangement forms will also be described later.
(3) Discharge space 3
The discharge space 3 has a configuration in which the front panel 1 and the back panel 2 are sealed by a sealing material (not shown). After evacuating the discharge space 3 to a high vacuum state, a discharge gas composed of at least one rare gas component of helium, xenon and neon is at a pressure of 29.9 to 79.8 kPa (225 to 600 Torr). It is enclosed with. In order to improve luminous efficiency in the PDP 10, the xenon content of the discharge gas is desirably 20 to 100% (volume%).
2. Columnar member and phosphor layer The columnar member constituting the partition wall 24 and the phosphor layer disposed thereon will be described with reference to FIG. This figure is a cross-sectional view in the virtual plane A of FIG. In FIG. 1B, for the sake of convenience, the columnar members arranged in the X direction are not shown.

  The partition wall 24 is composed of a plurality of columnar members assembled to the dielectric layer 23. Each of the columnar members 241a, 241b, 241c is fitted in the dielectric layer 23. The fitting is performed by fitting the end portions of the columnar members 241a, 241b, 241c to the dielectric layer 23 as shown in the figure. This fitting is performed by fitting partition walls 241 a, 241 b, and 241 c having shapes corresponding to the groove portions (depth D 1 (about 5 μm)) of the dielectric layer 23. Further, the partition walls 241a, 241b, and 241c have a constant height, but have different thicknesses W1, W2, and W3, and sequentially have a size of 40 μm, 30 μm, and 50 μm.

  As shown in the figure, the phosphor layer 25 is not integrally formed in one discharge space 3B, 3R, 3G, and is formed on the partition walls 241a, 241b, 241c and the surface portion of the dielectric layer 23 constituting one discharge space. It is formed individually. For example, in the discharge space 3B, green phosphor layers 251B and 253B having a thickness of D22 (10 μm) are formed on the main surfaces of the opposing columnar members 241a and 241b, and the dielectric layer 23 sandwiched between these columnar members 241a and 241b. A green phosphor layer 252B having a thickness D21 (10 μm) is formed in the portion. Although not shown, a green phosphor layer having a thickness D22 is also formed on the main surface of the columnar member of the second partition wall facing in the discharge space 3B. Further, the columnar members constituting the second partition 242 have different thicknesses. Furthermore, the kind of color of the fluorescent substance layer formed for every thickness differs. However, the columnar members constituting the second partition walls have the same color phosphor layer formed on both main surfaces, although the color of the phosphor layer for each columnar member is different.

In each of the discharge spaces 3B, 3R, and 3G configured as described above, the size of the discharge space W _C1 in the X direction is set to 100 μm. The data electrodes 22 are evenly spaced from each other, and the discharge space size W _C1 for each of the discharge spaces 3B, 3R, and 3G is equally configured to be 100 μm. In the case of the barrier ribs 24 according to the present embodiment, the discharge regions 3B, 3R, and 3G have the same size W _C1 , but the discharge regions that contribute to the discharge have different sizes. For example, the length in the X direction as shown, the size W _B of the discharge region of the discharge space 3B is larger than the size W _R of the discharge region of the discharge space 3R. This is based on the difference in the width of the columnar members 241a and 241b constituting the discharge spaces 3B and 3R.

Specifically, it will be described with reference to a cross-sectional view of the main part of FIG. For convenience of explanation, the description of the back substrate and the front panel is omitted.
As illustrated, adjacent columnar members 241a, 241b, and 241c have different thicknesses, and boundaries of the discharge spaces are indicated by boundary lines (dotted lines) L31, L32, L33, and L34. Note that the intervals between these boundary lines, the so-called cell pitch intervals (distance W _C1 between the dotted lines) are all equal. For example, the adjacent columnar members 241a and 241b each have a thickness of t1 on the opposite side from the boundary line. Similarly, the columnar members related to the other discharge spaces have thicknesses t2 and t3 from the boundary line. Therefore, in the case of the columnar member 241a having the thickness W1, the thickness of the columnar member according to the present embodiment has a thickness t1 from the boundary line in one discharge space in a state assembled to the dielectric layer. , And has a thickness of t3 in the adjacent discharge space. The green phosphor layer 251B is provided on the thickness side of t1, and the red phosphor layer 25G is provided on the thickness side of t3. Similarly, the other columnar members have a combination in which phosphor layers of respective colors are formed on the columnar members having predetermined thicknesses t2, t3, and t1 from the boundary line. In this way, by setting the partition wall 24 in which the columnar members are arranged in a state in which the thickness of the columnar members is set as described above with respect to the boundary line between the discharge spaces, The volume can be adjusted appropriately. In addition, the configuration having a difference in the size of the discharge region is superior to the configuration in which the size of the discharge region is not different in the following points.

When the three types of phosphor layers are formed in the discharge space as described above, the user's relative luminous sensitivity often differs depending on the color of each discharge space if the discharge space has the same size. In particular, regarding the user's specific visibility in a bright place (photopic vision), red is lower than the emission color (green) from the discharge space 3G in which the green phosphor layer is formed. Blue is lower than red. These differences can be an element that hinders improvement in display performance of the PDP 10. However, in the configuration according to the present embodiment, the discharge area 3B in which the blue light having the lowest specific luminous sensitivity is emitted is maximized, and the specific luminous efficiency is the highest. The discharge space 3G that emits green light has the smallest discharge area (W _G <W _R <W _B ). Thereby, it becomes possible to suppress the difference in the relative visibility. Of course, the above-described suppression can be realized without precisely setting other elements contributing to light emission, such as the amount of the phosphor layer and the magnitude of the applied voltage, for each of the discharge spaces 3G, 3B, and 3R. In the partition wall 241 according to this embodiment, the width _W B of the volume of the cell pitch interval _{W C1} and discharge _spaces, W G, but extends in a state of having a _{W R,} as described above, the partition wall 241 Since a plurality of columnar members are assembled, the partition wall thickness can be locally changed even in one partition wall by using columnar members having partially different thicknesses. Effect Thus, for example, be a phosphor layer of the same green was arranged discharge cell, it is possible to vary the width W _B of the volume of locally discharge space, as appropriate, on the spectral luminous efficiency of the user It can correspond to.

  In the present embodiment, as shown in the perspective view of the main part in FIG. 3, the columnar members 242a, 242b, and 242c constituting the second partition 242 also have different thicknesses W11, W12, and W13 (W11 <W12 <W13). ) Is set as follows. As is clear from FIG. 3, the discharge spaces 3B and 3R having the phosphor layers of other colors with respect to the discharge space 3G having the green phosphor layer are different in the thickness, respectively, at one end in the Y direction. The discharge region contributing to the discharge can be made large by the length of L1, L2 (L1> L2). In addition, since the second partition 242 has a configuration in which a plurality of columnar members are assembled, the thickness can be partially changed in one partition as in the first partition 241, and the same effect as described above can be obtained. Can be obtained. In the Y direction, the cell pitch interval is equal to the adjacent cell pitch interval as in the X direction described above.

Therefore, in the grid-like barrier ribs 24, both the first barrier rib 241 and the second barrier rib 242 can increase the discharge area of the discharge space in which the color (for example, blue) that lowers the relative visibility of the user is emitted. The degree of freedom in design related to the PDP in which the difference in relative visibility is suppressed is increased. Both the first barrier rib 241 and the second barrier rib 242 use columnar members having different thicknesses. However, depending on the light emission performance of the discharge spaces 3B, 3R, and 3G, either the first barrier rib 241 or the second barrier rib 242 is used. Only a columnar member having a different thickness may be used. In addition, although the sizes of the discharge regions of the respective discharge spaces 3G, 3B, and 3R are different, all three sizes are set differently so long as the difference in the light emission performance can be suppressed by the constituent material of the phosphor layer. It doesn't matter. Furthermore, depending on the size of the discharge space, the thickness of the phosphor layer formed on the main surface of the columnar member may be different from the thickness of the phosphor layer formed on the dielectric layer.
3. Manufacturing method of back panel 2 The manufacturing method of the back panel 2 provided with the partition 24 and the fluorescent substance layer 25 of the said structure is demonstrated using FIG. This figure is a perspective view showing the main part of the manufacturing process of the back panel 2. The manufacturing method of the back panel 2 according to the present embodiment includes a mask pattern forming step of forming a predetermined pattern of photoresist on a dielectric layer having a flat main surface, and a groove portion in an area where the photoresist is not disposed. A groove forming process for forming, a phosphor forming process for forming a phosphor layer in a region where the groove is not formed, and a partition arranging process for arranging a partition in the groove are sequentially performed.

  In the mask pattern forming process, as shown in FIG. 4A, the data electrode 22 and the flat main surface dielectric layer 230 are sequentially stacked on the back substrate 21, and a stripe shape is formed thereon. The photoresist 310 is formed. The stripe shape is a shape having a region not covered with the photoresist 310 in a region between the data electrodes 22. A known manufacturing method is used for the formation of the data electrode 22 and the like.

  Next, in the groove forming step, a sandblast method is performed on the dielectric layer 230 having the flat main surface on which the photoresist is formed. In the region of the dielectric layer 230 not covered with the photoresist 310, stripe-shaped grooves S21 and S23 are formed as shown in FIG. At this time, one groove S23 has a width W3 (50 μm), and the other groove S21 has a width W1 (40 μm). Although not shown, groove portions each having a width W2 (30 μm) are provided on one side of the groove portion 23 opposite to the other groove portion S21 and on the opposite side of the other groove portion S21 to the one groove portion S23. Similarly, they are formed in a stripe shape. Each of the grooves has a depth D1 (see the enlarged view of FIG. 4C).

After forming the dielectric layer 23 having the grooves S21 and S23, in the phosphor layer forming step, the blue phosphor layer 252B and the red phosphor layer 252R are formed on the surface of the dielectric layer 23 where the grooves S21 and S23 are not formed. A green phosphor layer 252G is formed as shown in FIG. These phosphor layers 252B, 252R, and 252G all have a thickness D21 (10 μm).
In the present embodiment, the phosphor layer 252B. A known screen printing method, ink jet method, dispenser method, or the like is used to form 252R and 252G. Generally, the phosphor layer is formed along the surface of the concave portion formed by the barrier ribs erected on the dielectric layer. In this case, when the discharge space becomes small (for example, when the size of W _C1 in FIG. 1B is small), the applied phosphor particles are clogged and the like, and the phosphor layer can be accurately formed. It becomes difficult. On the other hand, as in the present embodiment, if the portions corresponding to the formation of the phosphor layers 252B, 252R, and 252G are flat and no columnar member or the like is erected on the portions corresponding to the formation, even if coating is performed with a fine pattern. Can be carried out with high accuracy. Further, in the present embodiment, as shown in the enlarged view of FIG. 4C, the region where the phosphor layers 252B, 252R, and 252G are formed is formed from the groove portion of the dielectric layer 23 to a position separated by a predetermined distance L21. It is desirable that the predetermined distance L21 is approximately the same as the thickness D21 of the phosphor layers 252B, 252R, and 252G.

  Then, in the partition arrangement step, as shown in FIG. 4D, columnar members 241a and 241c having the same widths W1 and W3 as the groove portions S21 and S23 are fitted into the groove portions S21 and S23 by a method described later. At this time, the columnar members 241a and 241c use 241U in a state where phosphor layers of different colors are already formed on one main surface and the other main surface (hereinafter referred to as “columnar member unit”). As shown in the enlarged view, the thickness of the phosphor layer is the size of the dielectric layer 23 portion (groove portion S21) that is not covered with the phosphor layers 252B and 252R except for the groove portions S21 and S23 in the phosphor layer forming step. , S23 to a predetermined distance L21). Moreover, the area | region of the fluorescent substance layer formed in a columnar member is set to the position spaced apart by the magnitude | size corresponding to the depth D1 of a groove part from the edge part of a columnar member.

  In the present embodiment, the blue phosphor layer 253B and the red phosphor layer 251R are formed on the main surface of the columnar member 241c having the width W3. However, the combination of the columnar member type and the phosphor layer type is not limited to this. Alternatively, phosphor layers 253B and 251R of the same color may be formed on other columnar members having widths W1 and W2. Further, the widths of the columnar members 241a, 241b, and 241c are not limited to different widths W1, W2, and W3, and may be the same width. However, as described above, if the columnar members 241a, 241b, and 241c having different widths are used, it is possible to prevent the columnar members 241a, 241b, and 241c from being erroneously disposed when fitting into the groove portions of the dielectric layer 23. Therefore, it is desirable to use the columnar members 241a, 241b, and 241c having different widths W1, W2, and W3.

  The manufacture of the columnar member unit 241U is as follows. For example, when manufacturing the columnar member 241c, as shown in the perspective view of FIG. 5, the red phosphor layer 251R is formed in a predetermined pattern on one main surface of a thin glass plate having a thickness of 50 μm and dried. Thereafter, similarly, the blue phosphor layer 253B having the same pattern shape is formed on the other main surface and dried. Each phosphor layer 251R, 253B is formed to a thickness of 10 μm. Then, the part shown with the dashed-dotted line in a figure is cut | disconnected with a laser cutter, and the several columnar member unit 241U is produced. Similarly, phosphor layers of corresponding colors are formed on a thin glass plate having a thickness of 40 μm and a thin glass plate having a thickness of 30 μm, respectively, thereby producing a columnar member unit 241U. Since the columnar member unit 241U is manufactured based on the glass material as described above, it has insulating properties.

By the way, in order to form the phosphor layer on the thin glass, a screen printing method which is a known manufacturing method can be used. However, since the phosphor is formed on the flat thin glass as described above, the sputtering method is used. A so-called thin film forming method such as the above can also be used. When the thin film forming method is used, the organic binder material does not remain in the formed phosphor layer as compared with the case where the screen printing method or the like is used. Therefore, since a phosphor layer containing no impurities can be formed, a PDP provided with the phosphor layer is preferable because it leads to an improvement in light emission efficiency. Further, since the phosphor layer laminated on the dielectric layer 23 is also formed by the above-described method before the partition wall 24 is formed, the phosphor layer can be similarly formed by using a thin film forming method.
4). About the fitting method of the columnar member unit As described above, the columnar member unit 241U is fitted into the groove portions S21 and S23 of the dielectric layer. In this embodiment, for example, the following method is used for the fitting.
4-1. Use of Robot Arm As shown in FIG. 6A, the columnar member unit 241U is arranged using a robot arm 400 that operates in the horizontal direction (X direction) and the arm unit 401 moves up and down.

  The back substrate 21 on which the dielectric layer 23 is disposed is placed (fixed) on the pedestal 403. The grip portion 402 connected to the arm portion 401 is brought close to the dielectric layer 23. The proximity of the arm unit 401 is performed as follows, for example. First, the pair of chucks 404 provided in the grip portion 402 is in a state of sandwiching the columnar member unit 241U. While maintaining this state, the arm 401 is moved to a predetermined position with respect to the back substrate 21 by a drive mechanism that can move in the direction of the arrow R1 (X direction) (indicated by a dotted line in the figure). Next, the arm portion 401 is rotated in the direction of arrow R2.

Through the above process, the columnar member unit 241U is brought close to the groove, and the end of the columnar member is fitted into the groove of the dielectric layer. After the fitting, the holding of the columnar member unit 241U by the chuck 404 is released.
By repeating the above steps, the plurality of columnar member units 241U can be fitted into appropriate grooves.
(Modified example using robot arm)
As shown in FIG. 6B, a table 501 on which the back substrate 21 provided with the dielectric layer 23 after the phosphor layer forming step is placed, and driving units 502 and 503 for driving the table 501 in the X direction and the Y direction. An XY table 500 including a chuck 504 for fixing the rear substrate 21 on the table 501 is used. The columnar member unit 241U is attached to a gripping member 600, and the gripping member 600 is fixed to a shaft 601 of an elevating cylinder (not shown).

In the manufacturing apparatus having such a configuration, the gripping member 600 is moved up and down in the thickness direction (Z direction) of the back substrate, and the back substrate 21 is moved in both the X and Y directions by the drive units 502 and 503. Then, the columnar member unit 25U is fitted to a predetermined position (position of the groove portion of the dielectric layer 23), and the gripping of the columnar member unit 25u by the gripping member 600 is released.
The relative position between the dielectric layer 23 and the columnar member unit 25U may need to be corrected in consideration of the arrangement of the back substrate 21 on the table 501 and the like. For this reason, in order to obtain an accurate positional relationship, a position detection sensor is provided in the gripping member 600 and the like, a position serving as a reference of the dielectric layer 23 is measured, and position correction is performed when the shaft 601 is moved up and down. It is also effective to implement. Here, as the position detection sensor, a contact-type sensor or a contact-type sensor can be used.
4-2. Use of Self-Mounting Process in Liquid In this embodiment, in addition to the placement method using the robot arm as described above, the placement using the following self-mounting process method in liquid (FAS method (Fluidic Self-Assembly)) is used. A method can also be taken.

In the FAS method, as shown in the schematic diagram of FIG. 7, the liquid 700 is injected into the tank 701, and the columnar member unit 25 </ b> U is fitted into the dielectric layer 23 in the liquid 700 with high accuracy. The back substrate 21 on which the dielectric layer 23 is laminated is held by a holder 702 disposed in the tank 701. Specifically, it is as follows.
First, the liquid 700 is injected into the tank 701 in a state where the back substrate 21 is held by the holder 702. It is preferable that the holder 702 is installed at the bottom of the tank 700 so as to be rotatable, and the upper surface thereof is installed obliquely with respect to the liquid level. The liquid 700 uses water or methyl alcohol, but other liquids can be used as appropriate. Note that it is preferable to use a liquid having a specific gravity smaller than that of the columnar member unit 241U because the columnar member unit 241U can be kept from floating on the liquid surface. Furthermore, it is preferable to adjust the specific gravity of the liquid so that the efficiency with which the columnar member unit 241U is arranged in a self-aligned manner on the dielectric layer 23 is increased.

  Next, the columnar member unit 25U is caused to flow into the liquid 700 from above the inclined surface of the holder 702. At the time of the inflow, a layer (hereinafter simply referred to as “guide layer”) 703 that guides the columnar member unit to a predetermined position while covering the dielectric layer 23 is laminated in advance. The guide layer 703 has holes 703a, 703b, and 703c penetrating in the thickness direction in a region where the phosphor layer is not formed on the dielectric layer 23. The columnar member unit 241U that has flowed in by the guide layer 703 moves on the surface of the guide layer 703 and enters the holes 703a, 703b, and 703c as shown in the enlarged view of FIG. Since the hole portions 703a, 703b, and 703c correspond to the size of the groove portion of the dielectric layer 23, the sizes thereof are different. The columnar member unit 241U is first introduced into the columnar member unit 241U having a thick columnar member, so that all the holes 703a corresponding to the size of the columnar member unit 241U are filled. After this state is reached, a columnar member unit 241U having a columnar member having the next largest thickness is newly introduced. Finally, a columnar member unit 241U including the columnar member having the smallest thickness is newly introduced. The columnar member units 241U having respective thicknesses enter the holes 703b and 703c suitable for the sizes. By providing the guide layer 703, the columnar member unit 241U does not protrude from the surface of the guide layer 703. Therefore, the movement of the flowed columnar member unit 241U is not blocked by the other columnar member units 241U. Even if the bottom and top of the columnar member unit 241U enter the holes 703a, 703b, and 703c upside down, the columnar member unit 241U protrudes from the surface of the dielectric layer 23, and movement of the other columnar member units 241U is blocked. The holder 702 can be rotated to move the columnar member unit 241U stagnated due to blocked movement and the columnar member unit 241U not properly fitted to the lower part in the slope direction. Although the columnar member unit 241U that has been moved is not shown, it is circulated and flows again from above the holder to be disposed in the holes 703a, 703b, and 703c at appropriate positions.

Through the above-described steps, each of the columnar member units 241U is fitted into an appropriate portion of the groove portion of the dielectric layer 23. After the columnar member unit 241U is fitted, the back substrate 21 is taken out of the tank 701 and the guide layer 703 is removed from the dielectric layer 23. As a result, a partition wall 24 in which a plurality of columnar members are fitted to the dielectric layer 23 is formed.
5. Verification Experiment Using the PDP provided with the back panel manufactured as described above, a verification experiment on the shapes of the barrier ribs and the phosphor layers was performed.

The PDP used in this experiment has a display area size of 5 inches diagonal, and the size of the divided discharge space (cell size) is 100 inches and equivalent to 8K × 4K (4000 scanning lines). . The discharge gas has a xenon content of 100% (volume%) and is sealed at a pressure of 29.9 kPa (225 Torr). 1 cell pitch (corresponding to _{W C1} in FIG. 1 (b)) 100 [mu] m, the width of the transparent electrode in Scn and Sus both 60 [mu] m, the width of the bus electrode are both 40 [mu] m. The display electrode pair has a discharge gap of 60 μm, and the data electrode has a width of 40 μm. The columnar member uses three types of widths of 30 μm, 40 μm, and 50 μm, and all have a height (a height that functions as a partition wall) of 80 μm.

In the evaluation method in this experiment, the shape of the barrier rib and phosphor layer of the degree of completion of the back panel was evaluated using a scanning confocal laser microscope (using a 408 nm short wavelength semiconductor laser). In addition, the emission luminance was evaluated using a CRT color analyzer.
In the conventional method in which the barrier ribs are formed by the photolithography method or the sand blasting method, and the phosphor is applied by the screen printing method or the ink jet method, pixel defects of 5 to 10% of the total number of pixels have been found. This is due to the quality of the phosphor due to missing printing, coating missing, etc. in the minute discharge space. On the other hand, in the manufacturing method according to the present embodiment, pixel defects caused by missing printing or missing coating of the phosphor can be reduced to 0.1% or less.

  Further, in the conventional method, the top width of the barrier rib is 30 μm and the bottom width is 50 μm, whereas in the manufacturing method according to the present embodiment, both widths are 30 μm, and the discharge region is enlarged. Furthermore, with regard to the thickness of the phosphor layer, in the conventional method, only about 3 μm can be formed in the part formed on the partition wall, and about 5 μm in the part formed on the dielectric layer, and the layer thickness distribution is non-uniform. . Further, the layer thickness distribution is different in one discharge space, and a variation image is generated for each discharge space in a plurality of discharge spaces. On the other hand, in the manufacturing method according to this embodiment, the phosphor layers formed on the barrier ribs and the dielectric layer are all uniform with a thickness of 10 μm.

As described above, in the PDP according to the conventional method, the light emission luminance at the time of all white display is 120 cd / m ² , and the luminance unevenness due to the non-uniform thickness of the phosphor layer occurs, but according to the present embodiment In the PDP, there is no luminance unevenness, and the light emission luminance is improved to 300 cd / m ² or more.
6). Other Matters In this embodiment, the rectangular groove is provided, but the present invention is not limited to this shape, and other shapes such as a tapered shape may be used. Furthermore, in order to increase the combined strength of the columnar member and the dielectric layer, an adhesive or the like may be interposed in the contact portion between the dielectric layer and the columnar member.

Further, for each discharge space having phosphor layers of each color, the volume of the discharge region is appropriately set by changing the thickness of the columnar member. However, the present invention is not limited to this, and the discharge space size (W101, W102, W103) shown in the cross-sectional view of FIG. It is not substantially equal and may be set to different sizes as appropriate.
Further, the shape of the partition wall 24 is not limited to the cross-girder shape as shown in the figure, for example, a so-called honeycomb shape having a hexagonal pattern as shown in the schematic plan view of FIG. 9A or other polygonal shapes. Such a shape may be used. Further, even in the case of the stripe shape, the shape is not limited to the case where one partition wall is linear, and a so-called meander shape in which a part is meandering as shown in FIG.

  The PDP according to the present invention can achieve high definition, can ensure high performance quality, and is useful because it can cope with various sizes.

(A) is a principal part expansion perspective view of PDP which concerns on this embodiment, (b) is principal part sectional drawing concerning the back panel of PDP. It is principal part sectional drawing of the back panel which concerns on this embodiment. It is a principal part perspective view of the partition which concerns on this embodiment. It is a perspective view which shows the manufacturing process of the back panel which concerns on this embodiment. It is a perspective view which shows the base member of the columnar member which concerns on this embodiment. It is a schematic diagram which shows the arrangement | positioning method of the columnar member which concerns on this embodiment. It is a schematic diagram of the self-mounting process in the liquid distribution of the columnar member according to the present embodiment. It is sectional drawing of PDP which showed the modification concerning this embodiment. It is the model top view of the partition which showed the modification which concerns on this embodiment. (A) is a principal part expansion perspective view of PDP which concerns on a prior art, (b) is sectional drawing of the back panel of PDP which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front panel 2 Back panel 3 Discharge space 11 Front board 12 Display electrode pair 13 Dielectric layer 14 Protection layer 21 Back board 22 Data electrode 23 Dielectric layer 24 Partition 25 Phosphor layer 241a, 241b, 241c Columnar member

Claims (21)

A plasma display panel in which a pair of substrates are arranged to face each other via a partition, and a space surrounded by the partition and both substrates is a discharge space,
The partition wall is configured by assembling a plurality of columnar members having insulating properties on one substrate,
A part of the plurality of columnar members has a thickness different from that of the remaining columnar members. The plasma display panel according to claim 1, wherein the partition wall includes the plurality of columnar members assembled in a cross shape or a stripe shape. The barrier ribs are shaped like a cross so as to partition each discharge space from the adjacent discharge space,
The plasma display panel according to claim 2, wherein one discharge space is surrounded by four columnar members from four directions. The plasma display panel according to claim 3, wherein a thickness of the columnar member is determined according to a light emission color in the discharge space. On the main surface of the columnar member, a first phosphor layer is formed in advance, and on the other hand, a dielectric layer is formed on the substrate on which the columnar member is assembled, and on the surface of the dielectric layer, The plasma display panel according to claim 4, wherein a second phosphor layer is formed in advance in a portion excluding the scheduled assembly position. The first phosphor layer and the second phosphor layer are at least one of three kinds of phosphor layers of green, blue, and red,
The plasma according to claim 5, wherein a thickness of the columnar member from a boundary portion between the one discharge space and an adjacent discharge space is determined according to a combination of the columnar member and the first phosphor layer. Display panel. The columnar members assembled in a row in the first direction among the plurality of columnar members are formed with phosphor layers of different colors on one main surface and the other main surface. The plasma display panel according to any one of the above. In the columnar members assembled in a row in the first direction, the combinations of the phosphor layers formed on the one main surface and the other main surface are red and green, green and blue, blue and red The plasma display panel according to claim 7. The thickness of the columnar member in which the phosphor layers are combined is the thickest among the combinations, the columnar member in which red and green are combined, and the columnar member in which blue and red are combined. The plasma display panel according to claim 8. Among the plurality of columnar members, the columnar members assembled in a row in the second direction intersecting with the first direction form the same color phosphor layer on one main surface and the other main surface. The plasma display panel according to any one of claims 7 to 9. The barrier ribs have a stripe shape that partitions discharge cell groups arranged in a row or column direction from adjacent discharge cell groups, and one columnar member is assembled corresponding to each discharge cell in one discharge cell group. The plasma display panel according to claim 2. The plasma display panel according to any one of claims 1 to 11, wherein a cell pitch interval of discharge spaces divided by the barrier ribs is the same as a cell pitch interval of adjacent discharge spaces. A dielectric layer is formed on the one substrate,
The plasma display panel according to any one of claims 1 to 12, wherein the dielectric layer has a groove portion, and each of the plurality of columnar members is fitted into the groove portion. A method of manufacturing a plasma display panel in which a pair of substrates are arranged opposite to each other with a partition wall, and a space surrounded by the partition wall and both substrates is a discharge space,
A plurality of columnar members having insulating properties are assembled on one substrate in stripes or crosses to form the partition walls,
A method of manufacturing a plasma display panel, wherein a part of the columnar members has a thickness different from that of the remaining columnar members as the plurality of columnar members. When forming the partition wall,
Assembling the plurality of columnar members in a grid pattern so as to partition each discharge space from the adjacent discharge space,
The method for manufacturing a plasma display panel according to claim 14, wherein one discharge space is surrounded by four columnar members from four directions. The method for manufacturing a plasma display panel according to claim 15, wherein a thickness of the columnar member is determined according to a light emission color in the discharge space. The columnar member is assembled to the dielectric layer formed on the one substrate,
Before assembling the columnar member, forming a dielectric layer on the one substrate, forming a first phosphor layer on the main surface of the columnar member, and assembling the columnar member in the dielectric layer The method of manufacturing a plasma display panel according to claim 16, further comprising: forming a second phosphor layer in a portion excluding a predetermined position. For the first phosphor layer and the second phosphor layer, at least one of three kinds of phosphor layers of green, blue, and red is used,
In the thickness direction of the columnar member, the four columnar members surrounding the four sides are assembled so that the length from the boundary between the discharge space adjacent to the one discharge space to the end of the columnar member is substantially equal. The method for manufacturing a plasma display panel according to claim 17. Before assembling the columnar member, a groove is formed at a position where the columnar member is to be assembled in the dielectric layer,
The plasma display panel according to claim 18, wherein the columnar member is assembled by fitting the columnar member into the groove. The method for manufacturing a plasma display panel according to any one of claims 14 to 19, wherein in the assembly of the columnar members, the columnar members are assembled in order from the thickest columnar member among the plurality of columnar members. 21. The method for manufacturing a plasma display panel according to claim 14, wherein the plurality of columnar members are assembled using an in-liquid self-mounting process in assembling the columnar members.

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