JP4976668B2 - Plasma display panel - Google Patents

Description

The present invention relates to a plasma display panel having a pair of substrates facing each other across a discharge space.

  In general, a plasma display panel includes a front substrate and a rear substrate which are a pair of glass substrates disposed to face each other via a discharge space. On the inner surface side of the front substrate, a plurality of transparent electrodes facing each other through a discharge gap, a plurality of display electrode pairs each including a bus electrode laminated on one end portion of the transparent electrodes, and a plurality of display electrodes provided between the display electrode pairs A black stripe or black matrix (hereinafter referred to as a black pattern), a display electrode pair, a dielectric layer covering the black pattern, a protective film, and the like are provided. On the inner surface side of the rear substrate, a plurality of address electrodes that are substantially orthogonal to the display electrodes of the front substrate, an address electrode protective layer that covers the address electrodes, and a discharge space provided on the address electrode protective layer are divided into a plurality of discharge cells. Stripe-shaped or grid-shaped barrier ribs divided into three, and phosphor layers of three primary colors of red (R), green (G), and blue (B) filled in the discharge cells, respectively, are provided. . A discharge gas such as a rare gas is enclosed in the plurality of discharge cells, and an image can be displayed by selectively emitting light in each discharge cell.

  In the plasma display panel having such a structure, the black pattern is formed of an insulating and visible light-absorbing material, and prevents reflection of external light and increases the contrast of the image. The bus electrode is formed in a straight line from a metal material mainly composed of Ag (silver), for example, and supplies power to the transparent electrode with low resistance.

  Here, in order to further improve the contrast of the screen in recent years, when forming the bus electrode, a conductive black paste is printed on the lower layer (the layer in contact with the transparent electrode) on the display side, and the conductive material is formed thereon. It has been practiced to form a black and white two-layer bus electrode by printing a white layer of a conductive silver paste.

  Conventionally, when forming a bus electrode having such a black-and-white two-layer structure, the electrical properties required for each of the bus electrode black layer and the black pattern are different, so each is formed in a separate process using a different material. It had been. For this reason, the number of paste compositions to be prepared and the number of steps are large, which has been a major factor in increasing manufacturing costs and reducing productivity.

  In order to solve such a problem, a plasma display panel manufacturing method is known in which a black pattern and a bus electrode black layer are collectively formed by a series of exposure, development, and baking processes (see, for example, Patent Document 1). This patent document 1 uses the same insulating black photocurable composition for the black pattern and the bus electrode black layer, and the black pattern and the bus electrode black layer through a series of exposure, development and baking processes. The bus electrode black layer is formed into a thin film having a predetermined thickness. Then, a configuration is adopted in which a bus electrode white layer containing conductive particles is formed on the bus electrode black layer to form a black and white two-layer bus electrode. Here, even if the bus electrode black layer does not have conductivity, the bus electrode black layer is formed in a thin film and is sandwiched between the transparent electrode and the bus electrode white layer, so that the transparent electrode Interlayer conduction with the bus electrode white layer is ensured.

JP 2004-63247 A (refer to pages 5 and 6 and FIG. 2)

  However, in the configuration as described in Patent Document 1 described above, since the bus electrode black layer is in a thin film shape, external light reflection is increased, and the light shielding ability by the black layer between pixels is weakened, and the image quality may be deteriorated. On the other hand, if the bus electrode black layer is formed thick in order to improve the image quality, an example of the problem is that the electrical resistance increases in the interlayer conduction between the transparent electrode and the bus electrode white layer, which may increase the power loss. As mentioned. As described above, there is a demand for a configuration that can satisfactorily manufacture a plasma display panel without impairing characteristics.

The present invention is, in view of the problems as described above, to provide a plasma display panel capable of efficiently producing a single object.

According to the first aspect of the present invention, a pair of substrates opposed to each other via a discharge space, a plurality of electrode pairs formed on the inner surface of one of the pair of substrates, and between the electrode pairs Each of the plasma display panels includes a first black layer formed, and the electrode pair includes a plurality of transparent electrodes facing each other through a discharge gap on an inner surface of the one substrate, and the discharge in the transparent electrodes. is configured to include a bus electrode having a second black layer and main conductive layer laminated on the opposite end with respect to the gap, the second black layer, the first black layer and the same It is formed of a material, the than the thickness of the second black layer observed containing conductive particles having a large particle diameter, the first black layer and the second black layer has an insulating property, and characterized in that Plasma display panel.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an internal structure of a plasma display panel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing the main part of the front substrate. FIG. 3 is a plan view schematically showing the main part of the front substrate. In the present embodiment, a plasma display panel having a grid-like partition is illustrated, but the present invention is not limited to this, and the present invention can also be applied to a plasma display panel having a stripe-like partition.

[Configuration of plasma display panel]
In the present embodiment, as shown in FIG. 1, reference numeral 100 denotes a plasma display panel (PDP). The PDP 100 is formed, for example, in a substantially planar rectangular shape, and uses light emission by plasma discharge to generate an image. Is a device for displaying. The PDP 100 includes a rear substrate 200 and a front substrate 300 which are a pair of substrates disposed to face each other via a discharge space H constituting an image display area. The back substrate 200 and the front substrate 300 are sealed by providing seal frits (not shown) at the respective outer peripheral edges, and the inside of the sealed space has a reduced pressure of about 6.7 × 10 ⁴ Pa (500 Torr), for example. The space is filled with a He—Xe (helium-xenon) or Ne—Xe (neon-xenon) inert gas.

  The back substrate 200 is formed, for example, in a planar rectangular shape using a sheet glass material. A plurality of linear address electrodes 210, an address electrode protection layer 220 covering the address electrodes 210, and a plurality of discharge spaces H provided on the address electrode protection layer 220 are formed on the inner surface of the rear substrate 200. A grid-like barrier rib 230 partitioned into discharge cells 231 and phosphor layers (240R, 240G, 240B) of three primary colors of red (R), green (G), and blue (B) filled in the discharge cell 231 in order. ), Etc. are provided.

  Specifically, the address electrodes 210 are made of, for example, Al (aluminum), and are arranged at regular intervals substantially perpendicular to the longitudinal direction of the back substrate 200. One end of each address electrode 210 extends to the outside of the address electrode protective layer 220, thereby forming an address electrode lead-out portion (not shown). A column electrode drive unit (not shown) is electrically connected to the address electrode lead-out unit, and a voltage pulse is applied to each address electrode 210 by appropriately controlling the column electrode drive unit. .

  The address electrode protection layer 220 is formed of, for example, glass paste, and is provided over substantially the entire surface excluding the address electrode lead portion on the inner surface of the back substrate 200. The address electrode protective layer 220 functions as a dielectric layer for preventing the wear of the address electrode 210 due to discharge and accumulating charges necessary for driving during panel driving. The above-described seal frit is provided on the outer peripheral edge of the address electrode protection layer 220.

  The partition wall 230 is formed of, for example, a glass paste having the same component as that of the address electrode protection layer 220 and is integrally formed inside the outer peripheral edge on the address electrode protection layer 220, that is, at a portion corresponding to the discharge space H. . Each partition 230 has a predetermined height dimension from the base end to the top, and defines a gap dimension between the back substrate 200 and the front substrate 300.

  The phosphor layers (240R, 240G, 240B) are excited by ultraviolet light generated in the respective discharge cells 231 and emit visible light of the three primary colors of red (R), green (G), and blue (B).

  The front substrate 300 constitutes the display surface of the PDP 100 and is formed, for example, in substantially the same shape with the same material as the rear substrate 200. On the inner surface of the front substrate, as shown in FIG. 1, a plurality of display electrode pairs 310 arranged at regular intervals in a state substantially orthogonal to the address electrodes 210 are provided between the display electrode pairs 310. A plurality of black patterns 320 as first black layers, a dielectric layer 330 covering the display electrode pair 310 and the black pattern 320, a protective layer 340 covering the dielectric layer 330, and the like are provided. Yes.

  Specifically, the display electrode pair 310 includes a plurality of pairs of transparent electrodes 311a and 311b facing each other via a discharge gap G (see FIG. 2), and a pair of linear shapes stacked on one end of the transparent electrodes 311a and 311b. Bus electrodes 312a and 312b.

  The plurality of pairs of transparent electrodes 311a and 311b are each formed in a substantially T shape with a transparent conductive film such as ITO (Indium Tin Oxide), and correspond to a predetermined discharge cell 231 on the opposite back substrate 200 one by one. Is provided. As shown in FIGS. 2 and 3, the discharge gap G is a gap having a predetermined width formed between the pair of transparent electrodes 311a and 311b. The discharge gap G causes the pair of transparent electrodes 311a and 311b. The gap is electrically disconnected.

  As shown in FIG. 1, the bus electrodes 312a and 312b are respectively stacked on the opposite ends of the pair of transparent electrodes 311a and 311b with respect to the discharge gap G (see FIG. 2). One end of each of the bus electrodes 312a and 312b extends to the outside of the dielectric layer 330, thereby forming a bus electrode lead portion (not shown). A row electrode driving unit (not shown) is electrically connected to the bus electrode lead-out unit. By appropriately controlling the row electrode driving unit, each of the transparent electrodes 311a and 311b has a low resistance voltage. A pulse is applied.

  As shown in FIG. 2, the bus electrodes 312a and 312b have bus electrode black layers 313a and 313b as second black layers provided on the transparent electrodes 311a and 311b, and the bus electrode black layers. It has a two-layer structure including main conductive layers 314a and 314b provided by being stacked on 313a and 313b.

  The bus electrode black layers 313a and 313b are formed of an insulating and visible light-absorbing material such as a black inorganic pigment, for example, and are formed by baking a black pattern 320P (see FIG. 4) in a baking process described later. Is done. The bus electrode black layer 313a and the bus electrode black layer 313b which are adjacent to each other with the black pattern 320 interposed therebetween are formed in series including the black pattern 320. The bus electrode black layers 313a and 313b absorb visible light irradiated from the outside of the front substrate 300.

  In such bus electrode black layers 313a and 313b, as shown in FIGS. 2 and 3, a conductive material such as Ag is formed on the opposite end of the plurality of transparent electrodes 311a and 311b with respect to the discharge gap G. Conductive particles 315 each having a substantially spherical shape made of a conductive material are provided. The particle diameter d1 of the conductive particles 315 is set to be not less than the film thickness d2 of the bus electrode black layers 313a and 313b at the minimum, and at the maximum between the adjacent bus electrode 312a and the bus electrode 312b with the black pattern 320 interposed therebetween. Is preferably set to be smaller than the distance d3 (d2 ≦ d1 <d3). That is, by setting the particle diameter d1 of the conductive particles 315 to be equal to or greater than the film thickness d2 of the bus electrode black layers 313a and 313b, the electrical connection between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b corresponding thereto is achieved. can get. In this state, the bus electrode black layers 313a and 313b have a so-called anisotropic conductivity state in which they have conductivity only in the film thickness direction and insulation in the direction intersecting the film thickness direction. It has become. On the other hand, by setting the particle size d1 of the conductive particles 315 to be smaller than the distance d3, a short circuit does not occur between the bus electrode 312a and the bus electrode 312b adjacent to each other with the black pattern 320 interposed therebetween.

  The main conductive layers 314a and 314b are formed of, for example, a metal material containing Ag (silver) as a main component, and are formed by baking a conductive pattern 314P (see FIG. 4) in a baking process described later. The main conductive layers 314a and 314b mainly contribute to power supply to the transparent electrodes 311a and 311b when the panel is driven.

A plurality of black pattern 320, the bus electrode black layer 313a, at 313b and same material, is formed in a straight line. The black pattern 320 absorbs visible light irradiated from the outside of the front substrate 300, similarly to the bus electrode black layers 313a and 313b.

  The dielectric layer 330 is formed of, for example, glass paste or the like, and is provided to face the address electrode protection layer 220 of the back substrate 200. The dielectric layer 330 prevents wear of the display electrode pair 310 due to electric discharge during panel driving, and accumulates charges necessary for driving. The protective layer 340 is made of, for example, MgO (magnesium oxide) and protects the dielectric layer 330.

[Plasma display panel manufacturing method]
Next, as a method for manufacturing the PDP 100 having the above-described configuration, a method for manufacturing the front substrate 300 will be described with reference to the drawings. FIG. 4 is a cross-sectional view schematically showing the front substrate for explaining the method of manufacturing the plasma display panel in the present embodiment, (A) shows the state after the transparent electrode forming step, and (B). Shows the state after the black pattern forming step, (C) shows the state after the conductive pattern forming step, and (D) shows the state after the firing step.

  In the pretreatment process, the inner surface side of the front substrate 300 is sufficiently cleaned in advance by ultrasonic cleaning or water washing using a neutral detergent. In the transparent electrode forming step, for example, a transparent electrode material layer such as ITO, which is a material of the plurality of transparent electrodes 311a and 311b, is formed on the entire inner surface side of the front substrate 300 by, for example, a sputtering method. As a result, a plurality of transparent electrodes 311a and 311b are formed as shown in FIG.

  Next, in the black pattern forming step, insulating and visible light-absorbing black fine particles such as black inorganic pigment and conductive particles 315 having a predetermined particle diameter d1 are blended in a resin and kneaded to obtain a black paste. Adjust it. Then, the black paste adjusted by an application method such as an offset printing method, a high-definition screen printing method, or a high-definition dispenser coating method is applied to the end of the transparent electrodes 311a and 311b opposite to the discharge gap G, and Then, coating is performed across the mutually facing ends of the plurality of transparent electrodes 311a and 311b located between a pair of adjacent discharge gaps G, thereby forming a black pattern 320P as shown in FIG. 4B. . At this time, the conductive particles 315 in the black pattern 320P are conductive in the black paste adjustment stage so that at least one particle is disposed on the end opposite to the discharge gap G in the plurality of transparent electrodes 311a and 311b. It is preferable to adjust the density of the particles 315 in advance. And it is preferable that the conductive particles 315 are dispersed in a state where the particles are separated from each other to some extent and are not conductive in a direction intersecting the film thickness direction of the black pattern 320P. The film thickness of the black pattern 320P to be formed is preferably adjusted as appropriate in consideration of the pattern shrinkage rate in the firing process. That is, for example, the pattern is applied by adjusting the film thickness of the black pattern 320P to a value substantially equal to or slightly larger than the particle diameter d1 of the conductive particles 315. As a result, the black pattern 320P contracts after the firing step, and a part of the conductive particles 315 protrudes from the black pattern 320P, so that reliable conduction between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b is obtained. Become.

  Thereafter, in the conductive pattern forming step, a conductive paste is prepared in which conductive fine particles such as Ag are blended in a resin and kneaded. Then, the conductive paste is applied to the discharge gap G in the transparent electrodes 311a and 311b on the black pattern 320P by a coating method such as an offset printing method, a high-definition screen printing method, or a high-definition dispenser coating method. The conductive pattern 314 </ b> P is formed as shown in FIG. 4C by applying to the portion corresponding to the opposite end. In this state, even if the conductive pattern 314P and the conductive particles 315 in the black pattern 320P are not in contact with each other, the conductive pattern 314P and the conductive particles 315 are in contact with each other by contraction through the baking process. If so, there is no problem.

  Thereafter, in the firing step, the black pattern 320P and the conductive pattern 314P are fired. As a result, after baking, the black pattern 320P and the conductive pattern 314P volatilize the resin component contained in each pattern, and the film thickness shrinks compared to before the baking step. As a result, as shown in FIG. 4D, a film smaller than the particle diameter d1 of the conductive particles 315 at the portions sandwiched between the conductive patterns 314P and the transparent electrodes 311a and 311b on both ends of the black pattern 320P. Bus electrode black layers 313a and 313b having a thickness of d2 are formed. And the black pattern 320 is comprised in the site | part pinched by the bus electrode black layer 313a, 313b of the said both ends in the said black pattern 320P. Each conductive pattern 314P constitutes main conductive layers 314a and 314b. The bus is composed of bus electrode black layers 313a and 313b and main conductive layers 314a and 314b stacked on the bus electrode black layers 313a and 313b. Electrodes 312a and 312b are formed. A plurality of transparent electrodes 311a and 311b facing each other through the discharge gap G and bus electrodes 312a and 312b stacked on the transparent electrodes 311a and 311b constitute a display electrode pair 310.

  Then, as a subsequent process of the firing process, a dielectric layer 330 is formed by applying a glass paste on the inner surface of the front substrate 300 with a die coater or the like so as to cover the display electrode pair 310 and the black pattern 320. A protective layer 340 made of MgO or the like is formed thereon, and the front substrate 300 is completed.

[Operation of plasma display panel]
An operation of the PDP 100 including the front substrate 300 manufactured as described above will be described. In the front substrate 300, conduction between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b is ensured through the conductive particles 315 included in the bus electrode black layers 313a and 313b. Accordingly, even if the bus electrode black layers 313a and 313b are formed thick in order to prevent reflection of external light and obtain a clear image quality, the display electrode pair 310 is switched to the transparent electrodes 311a and 311b in driving the panel. Power is supplied with low resistance. For this reason, the power consumption required for driving the entire PDP 100 is reduced.

  The bus electrode black layers 313 a and 313 b have a predetermined film thickness d 2, and a black pattern 320 is provided between each display electrode pair 310. As a result, the portion of the front substrate 300 other than the portion corresponding to the discharge cells 231 is almost covered with the visible light absorbing black layer, and the visible light from the outside of the front substrate 300 is sufficiently absorbed. When the panel is driven, the discharge lights between adjacent pixels do not interfere with each other.

  Further, the bus electrode black layers 313a and 313b are in a state of so-called anisotropic conductivity that has conductivity only in the film thickness direction and insulation in the direction intersecting the film thickness direction. ing. In addition, in the black pattern 320, insulation is ensured in the direction intersecting the film thickness direction. Thus, when the panel is driven, a short circuit does not occur between the bus electrode 312a and the bus electrode 312b adjacent to each other with the black pattern 320 interposed therebetween, and a predetermined discharge cell 231 is accurately lit.

[Operational effects of plasma display panel and manufacturing method thereof]
As described above, in the above-described embodiment, the PDP 100 is provided with the rear substrate 200 and the front substrate 300 facing each other via the discharge space H, and the plurality of display electrode pairs 310 formed on the inner surface of the front substrate 300. A black pattern 320 formed between the display electrode pair 310 is provided. A plurality of transparent electrodes 311a and 311b facing the display electrode pair 310 via a discharge gap G, and a bus electrode black layer 313a stacked on the opposite end to the discharge gap G in the transparent electrodes 311a and 311b. , 313b and bus electrodes 312a and 312b having main conductive layers 314a and 314b. Then, the bus electrode black layer 313a, the 313b, formed black pattern 320 and at the same first material, is provided with a conductive particle 315 having a large particle diameter d1 in the interior layers than the thickness d2.

  Therefore, it is possible to ensure good conduction between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b via the conductive particles 315 included in the bus electrode black layers 313a and 313b. As a result, the bus electrode black layers 313a and 313b and the black pattern 320 can be collectively formed of the same material, and the types of materials used for manufacturing and the number of manufacturing steps can be greatly reduced. Further, even if the bus electrode black layers 313a and 313b are formed thick in order to prevent reflection of external light and obtain a clear image quality, the display electrode pair 310 is changed to the transparent electrodes 311a and 311b in driving the panel. It is possible to supply power with low resistance. Therefore, the PDP 100 can be manufactured efficiently, and the good image quality characteristics and low power consumption of the PDP 100 can be obtained.

  Further, the black pattern 320 is provided with insulation in a direction intersecting with the film thickness direction. For this reason, even when the bus electrode black layer 313a and the bus electrode black layer 313b adjacent to each other with the black pattern 320 interposed therebetween are formed in series including the black pattern 320, the black pattern 320 is interposed during panel driving. A short circuit can be prevented from occurring between the bus electrode 312a and the bus electrode 312b adjacent to each other. Thereby, a predetermined discharge cell 231 can be accurately turned on, and reflection of external light can be suitably prevented by the black pattern 320 and the bus electrode black layers 313a and 313b formed in series. Therefore, good display characteristics of the PDP 100 can be obtained.

  The particle size d1 of the conductive particles 315 is set smaller than the distance d3 between the bus electrode 312a and the bus electrode 312b adjacent to each other with the black pattern 320 interposed therebetween. Therefore, the presence of the conductive particles 315 can prevent a short circuit from occurring between the bus electrode 312a and the bus electrode 312b adjacent to each other with the black pattern 320 interposed therebetween.

  In the method of manufacturing the PDP 100, the transparent electrodes 311a and 311b are formed in the transparent electrode forming step. In the black pattern forming step, the black paste containing the conductive particles 315 is located on the opposite end of the transparent electrodes 311a and 311b with respect to the discharge gap G and between a pair of adjacent discharge gaps G. The black pattern 320P is formed by applying across the ends of the transparent electrodes 311a and 311b facing each other. Furthermore, the conductive pattern 314P is formed in the conductive pattern formation step, and the black pattern 320P and the conductive pattern 314P are baked in the subsequent baking step.

  For this reason, conventionally, the black pattern and the bus electrode black layer are formed of different materials in separate steps, but the bus electrode black layers 313a and 313b and the black pattern 320 are made of the same material. , And can be collectively formed by a series of pattern coating and baking processes. For this reason, since the kind of material used for manufacture can be reduced and a manufacturing process can be reduced significantly with this, a manufacturing cost can be made low. Further, in the state where conduction between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b is ensured through the conductive particles 315 included in the bus electrode black layers 313a and 313b by the above manufacturing method, A pair 310 and a black pattern 320 are obtained. As a result, the conductivity between the bus electrodes 312a and 312b and the transparent electrodes 311a and 311b can be obtained regardless of the film thickness d2 of the bus electrode black layers 313a and 313b. The bus black layers 313a and 313b having the characteristics can be obtained, and power can be supplied to the transparent electrodes 311a and 311b with low resistance. Therefore, the PDP 100 can be efficiently manufactured while ensuring suitable display properties and low power consumption.

  Further, in the black pattern forming step, the black paste is so arranged that at least one or more conductive particles 315 in the black pattern 320P are arranged on the end portion on the opposite side to the discharge gap G in the plurality of transparent electrodes 311a and 311b. In the adjustment step, the density of the conductive particles 315 is adjusted. Therefore, reliable conductivity between the bus electrodes 312a and 312b and the transparent electrodes 311a and 311b can be obtained.

  In the black pattern forming step, by adjusting the density of the conductive particles 315 in the black paste adjusting step, the conductive particles 315 are dispersed in the black pattern 320P in a state in which the particles are spaced apart to a certain extent. The pattern 320P is not conductive in the direction intersecting the film thickness direction. For this reason, the bus electrode black layers 313a and 313b are electrically conductive only in the film thickness direction, and have a so-called anisotropic conductivity state having insulation in the direction intersecting the film thickness direction. can do. Further, a short circuit can be prevented from occurring between the bus electrode 312a and the bus electrode 312b adjacent to each other with the black pattern 320 interposed therebetween.

[Modification of Embodiment]
In addition, this invention is not limited to embodiment mentioned above, The deformation | transformation shown below is included in the range which can achieve the objective of this invention.

  That is, in the above-described embodiment, as described above, the configuration including the grid-like partition wall 230 is illustrated, but the present invention is not limited to this, and the present invention is a plasma display panel including any shape of partition wall such as a stripe shape. Can be used.

  In the above embodiment, the configuration in which the plurality of linear display electrode pairs 310 are provided in parallel is exemplified. However, the present invention is not limited to this, and the shape of the display electrode pairs is any pattern shape such as a shape bent in a staircase pattern. But you can. Even in such a case, the same effect as the above-described embodiment can be obtained, that is, the plasma display panel can be efficiently manufactured.

  In the above-described embodiment, the configuration in which the transparent electrodes 311a and 311b are formed in a substantially T shape is illustrated. However, the shape of the transparent electrode may be any shape such as a rectangular shape. Even in such a case, the same effect as the above-described embodiment can be obtained, that is, the plasma display panel can be efficiently manufactured.

  Furthermore, in the above-described embodiment, the configuration in which the bus electrode black layer 313a and the bus electrode black layer 313b adjacent to each other with the black pattern 320 in between are formed in series including the black pattern 320 is described. Not limited to. That is, a configuration may be adopted in which a gap is formed between each of the bus electrode black layer 313a, the black pattern 320, and the bus electrode black layer 313b. In the case of such a configuration, the bus electrode black layer and the black stripe can be collectively formed in the series of paste applying process and baking process using the same material as in the above embodiment. In addition, since the bus electrode black layer and the black stripe are separated from each other, occurrence of a short circuit between adjacent bus electrodes can be reliably prevented.

  In the above embodiment, the conductive particles 315 are formed in a substantially spherical shape. However, the conductive particles 315 are not limited to this. For example, the transparent electrodes 311a and 311b and the main conductive layers corresponding thereto such as a flat spherical shape, a star shape, and a cubic shape. Any shape can be used as long as electrical connection with 314a and 314b can be ensured.

  And in the said embodiment, when forming the display electrode pair 310 and the black pattern 320 in the front substrate 300, as shown in FIG. 4, a transparent electrode formation process, a black pattern formation process, a conductive pattern formation process, The firing step is sequentially performed, but is not limited thereto. That is, for example, as shown in FIG. 5, the conductive particles 315 may not be mixed into the black paste, and the step of providing the conductive particles 315 and the step of applying the black paste may be performed separately. Here, FIG. 5 is a cross-sectional view schematically showing the front substrate for explaining the method of manufacturing the plasma display panel in the modification of the embodiment, and FIG. Shows the state, (B) shows the state after the particle disposing step, (C) shows the state after the black pattern forming step, (D) shows the state after the conductive pattern forming step, (E) Indicates the state after the firing step. The plasma display panel manufacturing method shown in FIG. 5 differs from that of the above-described embodiment shown in FIG. 4 only in the black pattern formation step (FIG. 4B). The same reference numerals are given and description thereof is omitted.

  Specifically, in the method for manufacturing PDP 100 shown in FIG. 5, a plurality of transparent electrodes 311a and 311b are formed on the inner surface side of front substrate 300 by the transparent electrode forming step (FIG. 5A). Next, in the particle disposing step, the conductive particles 315 having a predetermined particle diameter d1 are disposed on the end opposite to the discharge gap G in the transparent electrodes 311a and 311b (FIG. 5B). . Then, after the conductive particles 315 are installed, in the black pattern forming step, a black paste in which insulating and visible light-absorbing black fine particles such as a black inorganic pigment are mixed and kneaded with the resin is prepared, On the opposite end of the transparent electrodes 311a and 311b with respect to the discharge gap G, and between the opposing ends of the plurality of transparent electrodes 311a and 311b located between a pair of adjacent discharge gaps G. Application is performed to form a black pattern 350P (FIG. 5C). Thereafter, the conductive pattern 314P is formed in the conductive pattern forming step (FIG. 5D), and in the baking step, the black pattern 350P and the conductive pattern 314P are baked, and the state shown in FIG. A front substrate 300 is obtained. Also in this case, the black pattern 350P and the conductive pattern 314P after firing are volatilized by the resin component contained in each pattern and shrink the film thickness compared to before the firing step, so the bus electrode black layers 313a and 313b Conductivity between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b is ensured through the conductive particles 315 included therein.

  According to such a method for manufacturing a plasma display panel, the same effect as that of the above embodiment can be obtained, that is, the PDP 100 can be manufactured efficiently. Further, in the plasma display panel manufactured by the method, since the conductive particles 315 are not included in the black pattern 320, between the bus electrode 312a and the bus electrode 312b adjacent to each other with the black pattern 320 interposed therebetween. It is possible to reliably prevent the occurrence of a short circuit, and to reduce the amount of conductive particles 315 used as compared with the manufacturing method shown in FIG. Furthermore, each conductive particle 315 can be brought into contact with each of the plurality of transparent electrodes 311a and 311b more reliably.

[Effects of Embodiment]
As described above, in the above embodiment, the PDP 100 is provided with the plurality of display electrode pairs 310 formed on the inner surface of the front substrate 300 and the black patterns 320 respectively formed between the display electrode pairs 310. Yes. Then, a plurality of transparent electrodes 311a and 311b facing the display electrode pair 310 via the discharge gap G, and a bus electrode black layer stacked at the end opposite to the discharge gap G in the transparent electrodes 311a and 311b. Bus electrodes 312a and 312b having layers 313a and 313b and main conductive layers 314a and 314b are provided. Then, the bus electrode black layer 313a, the 313b, formed black pattern 320 and at the same first material, is provided with a conductive particle 315 having a large particle diameter d1 in the interior layers than the thickness d2. Therefore, it is possible to ensure good conduction between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b via the conductive particles 315 included in the bus electrode black layers 313a and 313b. As a result, the bus electrode black layers 313a and 313b and the black pattern 320 can be collectively formed of the same material, and the types of materials used for manufacturing and the number of manufacturing steps can be greatly reduced. Further, even if the bus electrode black layers 313a and 313b are formed thick in order to prevent reflection of external light and obtain a clear image quality, the display electrode pair 310 is changed to the transparent electrodes 311a and 311b in driving the panel. It is possible to supply power with low resistance. Therefore, the PDP 100 can be efficiently manufactured without impairing characteristics such as the image quality of the PDP 100.

  In the method for manufacturing the PDP 100, the transparent electrodes 311a and 311b are formed in the transparent electrode forming step. In the black pattern forming step, the black paste containing the conductive particles 315 is located on the opposite end of the transparent electrodes 311a and 311b with respect to the discharge gap G and between a pair of adjacent discharge gaps G. The black pattern 320P is formed by applying across the ends of the transparent electrodes 311a and 311b facing each other. Furthermore, the conductive pattern 314P is formed in the conductive pattern formation step, and the black pattern 320P and the conductive pattern 314P are baked in the subsequent baking step. For this reason, conventionally, the black pattern and the bus electrode black layer are formed of different materials in separate steps, but the bus electrode black layers 313a and 313b and the black pattern 320 are made of the same material. , And can be collectively formed by a series of pattern coating and baking processes. Further, the display electrode pair 310 and the black pattern are connected in a state where conduction between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b is ensured via the conductive particles 315 included in the bus electrode black layers 313a and 313b. 320 is obtained. As a result, the bus electrode black layers 313a and 313b having sufficiently low reflectivity and light shielding properties can be obtained, and power can be supplied to the transparent electrodes 311a and 311b with low resistance. Therefore, the PDP 100 can be efficiently manufactured without impairing characteristics such as the image quality of the PDP 100.

  Furthermore, in another method for manufacturing the PDP 100, the transparent electrodes 311a and 311b are formed in the transparent electrode forming step. Next, in the particle disposing step, the conductive particles 315 having a predetermined particle diameter d1 are disposed on the end opposite to the discharge gap G in the transparent electrodes 311a and 311b. In the black pattern forming step, a plurality of transparent electrodes 311a and 311b are disposed on the end opposite to the discharge gap G in the transparent electrodes 311a and 311b and between a pair of adjacent discharge gaps G. The black pattern 320 </ b> P is formed by coating between the mutually facing ends. Furthermore, the conductive pattern 314P is formed in the conductive pattern formation step, and the black pattern 320P and the conductive pattern 314P are baked in the subsequent baking step. For this reason, conventionally, the black pattern and the bus electrode black layer are formed of different materials in separate steps, but the bus electrode black layers 313a and 313b and the black pattern 320 are made of the same material. , And can be collectively formed by a series of pattern coating and baking processes. Further, the display electrode pair 310 and the black pattern are connected in a state where conduction between the transparent electrodes 311a and 311b and the main conductive layers 314a and 314b is ensured via the conductive particles 315 included in the bus electrode black layers 313a and 313b. 320 is obtained. As a result, the bus electrode black layers 313a and 313b having sufficiently low reflectivity and light shielding properties can be obtained, and power can be supplied to the transparent electrodes 311a and 311b with low resistance. Therefore, the PDP 100 can be efficiently manufactured without impairing characteristics such as the image quality of the PDP 100.

It is the perspective view which showed the internal structure of the plasma display panel which concerns on one embodiment of this invention. It is sectional drawing which showed typically the principal part of the front substrate in the said embodiment. It is the top view which showed typically the principal part of the front substrate in the said embodiment. It is sectional drawing which showed the front substrate typically in order to demonstrate the manufacturing method of the plasma display panel in the said embodiment, (A) shows the state after a transparent electrode formation process, (B) is black pattern formation The state after a process is shown, (C) shows the state after a conductive pattern formation process, (D) shows the state after a baking process. It is sectional drawing which showed the front substrate typically in order to demonstrate the manufacturing method of the plasma display panel in the modification of the said embodiment, (A) shows the state after a transparent electrode formation process, (B) is (C) shows the state after the black pattern forming step, (D) shows the state after the conductive pattern forming step, and (E) shows the state after the firing step. It is a thing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Plasma display panel 200 ... Back substrate 300 ... Front substrate 310 ... Display electrode pair 311a, 311b ... Transparent electrode 312a, 312b ... Bus electrode 313a, 313b ... Bus electrode black layer (2nd black layer)
314a, 314b ... main conductive layer 314P ... conductive pattern 315 ... conductive particle 320 ... black pattern (first black layer)
320P, 350P ... black pattern d1 ... conductive particle size d2 ... bus electrode black layer thickness G ... discharge gap H ... discharge space

Claims (1)

A pair of substrates opposed to each other via a discharge space, a plurality of electrode pairs formed on the inner surface of one of the pair of substrates, and a first black layer formed between each of the electrode pairs; A plasma display panel comprising:
The electrode pair is
A plurality of transparent electrodes facing each other through a discharge gap on the inner surface of the one substrate;
A bus electrode having a second black layer and a main conductive layer laminated at an end opposite to the discharge gap in the transparent electrode,
The second black layer is formed by the first black layer and the same material, seen containing conductive particles having a particle size greater than the thickness of the second black layer,
The first black layer and the second black layer have insulating properties.
A plasma display panel characterized by that.

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