JP4046162B2 - Method for forming phosphor layer of plasma display panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of forming a phosphor layer of a PDP (plasma display panel), and more particularly to a method of forming a phosphor layer of a PDP having partition walls (ribs). The PDP is attracting attention as a thin display device having a wide viewing angle, and high definition and large screens are being promoted in order to expand applications in the field of high vision.
[0002]
[Prior art]
In the PDP, the front side substrate and the back side substrate are arranged facing each other with a slight gap, the periphery is sealed, the discharge space is filled with a discharge gas, and light emission at the time of occurrence of discharge in the discharge space is utilized. This is a self-luminous display panel that performs display.
[0003]
In this PDP, a band-shaped partition wall is usually formed on the back side substrate. The strip-shaped partition wall has a straight line shape or a meandering shape in detail. The straight shape is called a straight rib structure, and the meandering shape is sometimes called a meander rib structure. In any structure of the PDP, a concave groove-shaped space surrounded by the partition walls becomes a discharge space, and a phosphor layer is formed in the discharge space.
[0004]
In this meander rib structure PDP, a device has been devised to increase the light emission luminance by increasing the cell area, and a narrow area (narrow part) and a wide area in one concave groove-like space (discharge space). (Wide portion) is formed, and the narrow portion is a non-light emitting region (non-discharge region) and the wide portion is a light emitting region (discharge region: cell). In this structure, a cell having a honeycomb structure having a substantially hexagonal light emitting region when seen in a plan view is well known (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
JP-A-9-50768 (FIGS. 1 and 2)
[0006]
[Problems to be solved by the invention]
In general, in order to form a phosphor layer in a groove-shaped discharge space formed between the barrier ribs, a phosphor powder in which a binder resin and a solvent are added to the phosphor powder in the groove-shaped discharge space. The body paste is applied by a printing method or the like, dried, and then baked to form the body paste.
[0007]
However, there are the following problems in forming a meandering partition wall on a substrate and forming a phosphor layer in a groove-shaped discharge space.
[0008]
That is, as shown in FIG. 8, the phosphor paste 33 is applied to the concave discharge space 32 formed between the barrier ribs 29 (FIGS. 8A and 8). b)), and the phosphor paste 33 is sucked into the narrow part 34 by the capillary phenomenon as shown by the arrow N (see FIG. 8C), and is dried and baked as it is, in the vicinity of the narrow part 34. The discharge space is narrow and the phosphor layer of the wide portion (light emitting region) 35 becomes thin (see FIG. 8D).
[0009]
As a result, there is a problem in that the luminance does not increase because the discharge in the light emitting region does not spread, and the light emission efficiency of the panel becomes lower than expected. For this reason, when applying the phosphor paste, the appearance of a technique that prevents the phosphor paste from being sucked into the narrow portion has been desired.
[0010]
The present invention has been made in consideration of such circumstances, and a resin paste that can be burned out is applied in advance to the narrow portion of the groove-shaped discharge space, and then the groove-shaped discharge is performed. The object is to prevent the phosphor layer from being formed in the narrow portion by applying the phosphor paste to the space and firing the resin paste and the phosphor paste.
[0011]
[Means for Solving the Problems]
In the present invention, a phosphor layer is formed in the concave groove of the panel substrate on which a plurality of barrier ribs are formed so that a narrow portion and a wide portion can be alternately arranged in the concave groove between adjacent barrier ribs. A resin paste that burns away by firing is applied to a narrow portion of the groove, and a phosphor paste containing a phosphor powder, a binder resin, and a solvent is applied to at least a wide portion of the groove. Then, a phosphor layer forming method for a plasma display panel, comprising forming a phosphor layer in the concave groove by firing a resin paste and a phosphor paste.
[0012]
According to the present invention, the resin paste that is burned off by baking is applied to the narrow part (narrow part) of the concave groove between the barrier ribs, and then the phosphor paste is applied to the concave groove. Therefore, since the resin paste exists in the narrow part when applying the phosphor paste, the phosphor paste is applied only to the wide part (wide part) of the groove without being attracted to the narrow part by capillary action. Is done. As a result, the resin paste in the narrow portion is burned down when the phosphor paste is baked, and the phosphor layer is formed only in the wide portion (wide portion) of the concave groove. As a result, the discharge space near the narrow portion can be widened, and the phosphor layer in the wide portion (light emitting region) can be prevented from becoming thin.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the panel substrate includes a substrate made of glass, quartz, ceramic, or the like, and a substrate in which desired components such as an electrode, an insulating film, a dielectric layer, and a protective film are formed on these substrates.
[0014]
The partition walls may be formed on the panel substrate so that a plurality of narrow portions and wide portions can be alternately formed in the concave grooves between the adjacent partition walls. From this point of view, the shape of the partition is not particularly limited, and may be any shape, such as a linear shape or a meandering shape. For example, in the case of a straight partition, a projection that narrows the groove may be provided on the linear partition. In this case, in order to allow a narrow portion and a wide portion to be alternately arranged in the concave groove between the adjacent partition walls, the adjacent partition walls and the meandering partition wall sequentially shifted by half a pitch, It is desirable to do. The meandering shape does not need to be smoothly bent, and may be an angular bend. This partition wall can be formed by a sandblast method, a printing method, a photoetching method, or the like known in the art. For example, a partition plate may be formed by using a glass plate as a substrate, forming a mask on the glass plate, and cutting grooves directly on the substrate by sandblasting. Alternatively, for example, a glass paste made of a low-melting glass frit, a binder resin, a solvent, or the like may be applied on a substrate and dried, then cut by a sandblast method and fired. At this time, instead of cutting by the sand blasting method, a photosensitive resin may be used as the binder resin, and it may be formed by baking after exposure and development using a mask.
[0015]
The resin paste may be any resin paste that can be applied to a narrow portion (narrow portion) of the groove and is burned off by firing. It is desirable that the resin paste has a viscosity that can be maintained by surface tension in a narrow portion of the groove after application. On the other hand, various application methods known in the art can be applied to the application of the resin paste, but from the point of accuracy, the screen printing method is preferable. Therefore, it is desirable that the viscosity of the resin paste is adjusted to 50 to 100 poise, which is a viscosity that can be maintained by surface tension in a narrow portion of the concave groove and can be screen-printed.
[0016]
From the above viewpoint, it is desirable to use the same binder resin and solvent as those used for the phosphor paste for the resin paste. That is, it is desirable to use a component obtained by removing the phosphor powder from the phosphor paste. If the resin paste has such components, it is advantageous because the resin paste can be burned out at the firing temperature of the phosphor paste. Examples of the binder resin include acrylic resin and ethyl cellulose. Examples of the solvent include terpene solvents such as terpineol and higher alcohols.
[0017]
The resin paste may contain a non-combustible black material, and in this case, the black material can remain in the narrow portion of the concave groove after the phosphor paste is fired. Thereby, since the non-light-emitting area | region (narrow part) can be made into a dark color, the contrast of the screen of a plasma display panel can be improved.
[0018]
A black pigment or the like can be used as the black material. As this black pigment, fine powders of complex oxides of Fe (iron), Mn (manganese), Cr (chromium), Cu (copper), and Co (cobalt) can be applied. For example, Cr oxide or Cu oxide having an average particle diameter of 2 to 3 μm can be applied. As an example of the Cr oxide, Cr ₂ O ₃ or the like can be used.
[0019]
The phosphor paste may be any material that can be applied to at least a wide portion of the groove, and a binder resin and a solvent are added to the phosphor powder of red (R), green (G), or blue (B), respectively. Things can be applied.
[0020]
Any phosphor powder known in the art can be used as the phosphor powder. For example, as the phosphor of R, Y ₂ O ₃ : Eu, (Y, Gd) BO ₃ : Eu, YVO ₄ : Eu, or the like can be applied. As the phosphor of G, Zn ₂ SiO ₄ : Mn, BaAl ₁₂ O ₁₉ : Mn, Zn ₂ GeO ₂ : Mn, or the like can be applied. As the phosphor of B, BaMgAl ₁₀ O ₁₇ : Eu, BaMgAl ₁₄ O ₂₃ : Eu, BaMgAl ₁₆ O ₂₇ : Eu, or the like can be applied.
[0021]
The binder resin and solvent of the phosphor paste are the same as those used for the resin paste described above.
[0022]
It is desirable to apply the phosphor paste by screen printing from the viewpoint of accuracy. At this time, the viscosity of the phosphor paste may be adjusted to 50 to 100 poise, which is the same as the viscosity of the resin paste.
[0023]
Firing is performed on the resin paste and phosphor paste applied to the concave grooves. For this firing, a firing method known in the art can be applied. For example, a substrate in which a resin paste and a phosphor paste are applied to the concave groove is carried into a firing furnace, and a temperature at which the binder resin and the solvent contained in the resin paste and the phosphor paste are burned out, for example, as a binder resin If the acrylic resin or ethyl cellulose described above is used and a terpene solvent such as terpineol or a higher alcohol is used as the solvent, baking is performed at a temperature of about 500 to 700 ° C.
[0024]
The present invention also provides a phosphor layer in the concave groove of the panel substrate on which a plurality of barrier ribs are formed so that a narrow portion and a wide portion can be alternately formed in the concave groove between adjacent barrier ribs. A phosphor paste containing a photosensitive material, a phosphor powder, a binder resin and a solvent is applied to the groove, and a process comprising a masking step, an exposure step, and a development step is performed. This is a method for forming a phosphor layer of a plasma display panel, which comprises removing a phosphor paste in a narrow portion and then firing the phosphor paste to form a phosphor layer in the concave groove. Also in this method, the partition is preferably a serpentine partition.
[0025]
The present invention further provides a plasma display panel comprising a substrate on which a phosphor layer is formed in a concave groove between the barrier ribs by the phosphor layer forming method described above.
[0026]
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In addition, this invention is not limited by this, A various deformation | transformation is possible.
[0027]
Embodiment 1
1 to 3 are explanatory views showing the structure of a PDP having a phosphor layer formed by using the phosphor layer forming method of the present invention. FIG. 1 is a partially exploded perspective view of a PDP, FIG. 2 shows a partition when the PDP is viewed in plan, and FIG. 3 shows a relationship between the partition, the display electrode, and the address electrode when the PDP is viewed in plan. ing.
This PDP is an AC type three-electrode surface discharge type PDP for color display, and is a PDP having a meander rib structure.
[0028]
This PDP is composed of a front panel assembly including a front substrate 11 and a rear panel assembly including a rear substrate 21. As the front substrate 11 and the rear substrate 21, a glass substrate, a quartz substrate, a ceramic substrate, or the like can be used.
[0029]
A plurality of display electrodes X and display electrodes Y are formed at equal intervals in the horizontal direction on the inner side surface of the substrate 11 on the front side. Each of the display electrodes X and Y is made of a wide transparent electrode 12 such as ITO or SnO ₂ and, for example, Ag, Au, Al, Cu, Cr, and a laminated body thereof (for example, a laminated structure of Cr / Cu / Cr). And a narrow bus electrode 13 made of metal. The display electrodes X and Y use a thick film method such as printing for Ag and Au, and the other, by combining a thin film method such as a vapor deposition method and a sputtering method with an etching method to obtain a desired number, thickness and width. And can be formed at intervals.
[0030]
On the display electrodes X and Y, a dielectric layer 17 for alternating current (AC) driving is formed so as to cover the display electrodes X and Y. The dielectric layer 17 is formed by applying a low-melting glass paste on the front substrate 11 by screen printing and baking.
[0031]
A protective film (not shown) is formed on the dielectric layer 17 to protect the dielectric layer 17 from damage caused by ion collision caused by discharge during display. This protective film is made of, for example, MgO, CaO, SrO, BaO or the like.
[0032]
A plurality of address electrodes (also called signal electrodes, data electrodes, etc.) A are formed on the inner side surface of the substrate 21 on the back side in a direction intersecting with the display electrodes X and Y in plan view, covering the address electrodes A. Thus, a dielectric layer 24 is formed. The address electrode A generates an address discharge for selecting a light emitting cell at the intersection with the scanning display electrode. For example, Ag, Au, Al, Cu, Cr, and a laminate thereof (for example, Cr / Cu / Cr laminated structure) and the like. As with the display electrodes X and Y, the address electrode A is also desired by using a thick film method such as printing for Ag and Au, and by combining a thin film method such as a vapor deposition method and a sputtering method with an etching method. Can be formed with the number, thickness, width, and spacing. The dielectric layer 24 can be formed using the same material and the same method as the dielectric layer 17.
[0033]
A plurality of meandering partition walls 29 are formed on the dielectric layer 24 between the adjacent address electrodes A and A (see FIG. 2). The partition walls 29 can be formed by a sand blast method, a printing method, a photo etching method, or the like. For example, in the sandblasting method, a glass paste made of a low melting point glass frit, a binder resin, a solvent, etc. is applied on the dielectric layer 24 and dried, and then a cutting mask having an opening of a partition pattern is formed on the glass paste layer. It forms by spraying cutting particle | grains in the provided state, cutting the glass paste layer exposed to the opening of a mask, and also baking. In the photo-etching method, instead of cutting with cutting particles, a photosensitive resin is used as the binder resin, and it is formed by baking after exposure and development using a mask.
[0034]
Red (R), green (G), and blue (B) phosphor layers 28R, 28G, and 28B are formed on the side surfaces of the partition walls 29 and on the dielectric layer 24 between the partition walls. For the phosphor layers 28R, 28G, and 28B, a phosphor paste containing phosphor powder, a binder resin, and a solvent is applied to the concave discharge space between the barrier ribs 29 by screen printing or a method using a dispenser. This is repeated for each color and then fired. The phosphor layers 28R, 28G, and 28B can be formed by a photolithography method using a sheet-like phosphor layer material (so-called green sheet) containing phosphor powder and a binder resin. In this case, a phosphor sheet of each color can be formed between the corresponding partition walls by applying a sheet of a desired color to the entire display area on the substrate, exposing and developing, and repeating this for each color. it can.
[0035]
In the PDP, the panel assembly on the front side and the panel assembly on the back side are arranged so that the display electrodes X and Y and the address electrode A intersect with each other, the periphery is sealed, and the partition 29 is surrounded. It is produced by filling the discharge space with a discharge gas. In this PDP, the hexagonal discharge space at the intersection of the display electrodes X and Y and the address electrode A is one cell region (unit light emitting region) which is the minimum unit of display. One pixel is composed of three cells of R, G, and B indicated by broken-line triangles in FIG. Since this arrangement is triangular, it is also called a delta cell arrangement.
[0036]
The display was first selected by using the display electrode group on the Y side as scan electrodes and sequentially applying a scan voltage to each display electrode Y and applying an address voltage to a desired address electrode A during that time. A cell to emit light is selected by generating an address discharge between the address electrode A and the display electrode Y. Since the wall charges are formed on the dielectric layer corresponding to the light emitting cell, a sustain voltage is applied alternately between the Y-side display electrode group and the X-side display electrode group, The cell is caused to emit light by generating a discharge again (referred to as a sustain discharge or a display discharge) in the cell in which the charge is accumulated. This cell emits light by exciting the phosphor with ultraviolet rays generated by display discharge and generating visible light of a desired color from the phosphor.
[0037]
The display is performed by generating a sustain discharge between the display electrode X and the display electrode Y as described above. Between the X and Y electrodes of the wide portion 1 where discharge occurs is a light emitting region, and between the X and Y electrodes of the narrow portion 2 where no discharge occurs is a non-light emitting region.
[0038]
4 (a) to 4 (d) are explanatory views showing Embodiment 1 of the phosphor layer forming method of the present invention.
In this method, first, a plurality of meandering partition walls 29 are formed on the back substrate (see FIG. 4A). The meandering partition walls 29 are shifted by a half pitch. For this reason, in the groove 30 between the partition walls 29, the narrow portion 1 that is a narrow portion and the wide portion 2 that is a wide portion are formed. In this example, the width of the narrow portion 1 is about 70 μm, and the width of the wide portion 2 is about 300 μm.
[0039]
In this example, the sand blast method is used to form the partition walls 29. In order to form the partition wall by this sandblasting method, a partition wall material layer is formed on the entire partition wall formation surface on the substrate, and then the partition wall material layer is sprayed with cutting particles through a mask corresponding to the partition wall shape. Cut the material layer.
[0040]
Next, before applying the phosphor paste into the concave groove 30 between the meandering partition walls 29, the resin paste 3 is previously applied to the narrow portion 1 so that the phosphor paste does not flow into the narrow portion 1. Apply and dry (see FIG. 4B).
[0041]
Application of the resin paste 3 to the narrow part 1 is performed by screen printing using a screen having an opening in a corresponding part of the narrow part 1. At this time, the viscosity of the resin paste 3 needs to be not less than the viscosity at which the applied resin paste 3 is maintained by the surface tension on the narrow portion 1 and not more than the viscosity at which screen printing is possible. The viscosity of the resin paste 3 is adjusted to 50 to 100 poise. The adhesion amount of the resin paste 3 can be controlled by adjusting the viscosity of the resin paste 3. By this printing, the resin paste 3 is applied only to the narrow part 1 and is formed so as to close the narrow part 1.
[0042]
As the resin paste 3, the same binder resin and solvent as those used for the phosphor paste to be applied later are used. As the binder resin, acrylic resin or ethyl cellulose is used. As the solvent, terpene solvents such as terpineol and higher alcohols are used.
[0043]
Thereafter, the phosphor paste 4 is applied to the entire concave groove between the partition walls 29 and dried (see FIG. 4C). The phosphor paste 4 is also applied to the grooves by screen printing using a screen having openings in the corresponding portions of the wide portion 2 that are the wide portions of the grooves. At this time, the viscosity of the phosphor paste 4 is also adjusted to the same 50 to 100 poise as that of the resin paste.
[0044]
As the phosphor paste 4, a phosphor powder known in the art is used, and the phosphor powder is added with a resin pace, a binder resin having the same components as those in 4, and a solvent.
[0045]
At the time of this screen printing, the narrow part 1 is blocked by the dried resin paste 3, so that the phosphor paste 4 does not flow into the narrow part 1.
[0046]
After the phosphor pace 4 is printed for each color, the phosphor paste 4 is dried and then baked to form phosphor layers 28R, 28G, and 28B for each color in the wide portion 2 of the concave groove (FIG. 4 (d)).
[0047]
Firing is performed at a temperature of about 500 to 700 ° C. when an acrylic resin or ethyl cellulose is used as a binder resin for the resin paste and the phosphor paste. By baking at this temperature, these resin components can be burned out. The solvent is almost lost at the time of drying, but the remaining solvent is also burned off at this temperature.
[0048]
That is, in this firing, the first applied resin paste 3 is burned off together with the resin component of the phosphor paste 4, and finally the phosphor layers 28R, 28G, and 28B in which the phosphor powder is solidified only in the wide portion 2 are formed. It is formed. As a result, it is possible to realize a structure in which the phosphor layer of the narrow part 1 is thin or the narrow part 1 has no phosphor layer at all. As a result, a phosphor layer having a large area and a constant thickness can be formed on the wide portion 2, and a PDP having stable light emission luminance can be obtained.
[0049]
Further, by making the phosphor layer of the narrow portion 1 thin or having no phosphor layer in the narrow portion 1, the impurity gas existing in the discharge space is exhausted or the discharge gas is introduced into the discharge space. It is possible to improve the air permeability when performing.
[0050]
5 and 6 are explanatory views showing an example in which a black pigment is added to a resin paste and fired. FIG. 6 shows a KK cross section of FIG.
You may add the black pigment which is not burnt down by baking to the resin paste 3 mentioned above. If the black pigment is added to the resin paste 3 in this way, when the phosphor paste is baked, the black pigment solidifies and remains in the narrow portion 1 to form the black pigment layer 6. As a result, the non-light emitting area, which is the narrow portion 1, can be darkened, and a black matrix effect can be produced in the PDP.
[0051]
As the black pigment, fine powders of complex oxides of Fe (iron), Mn (manganese), Cr (chromium), Cu (copper), and Co (cobalt) are applied. For example, Cr oxide or Cu oxide having an average particle diameter of 2 to 3 μm is applied. As an example of the Cr oxide, Cr ₂ O ₃ or the like is used.
[0052]
Thus, by forming the black pigment layer in the non-light emitting region, it is possible to improve the contrast when displaying the PDP.
[0053]
Even when the narrow portion 1 has no phosphor layer, a black pigment is added to the dielectric layer 21 (see FIG. 1) formed on the substrate 21 on the back side to make the dielectric layer 21 dark. In this case, since the dielectric layer 21 can be seen from the display surface side of the portion without the phosphor layer, the contrast when displaying the PDP is improved as in the case where the black pigment layer is formed in the non-light emitting region. be able to.
[0054]
Embodiment 2
FIG. 7A to FIG. 7D are explanatory views showing Embodiment 2 of the phosphor layer forming method of the present invention.
In this method, first, as in the first embodiment, a plurality of meandering partition walls 29 having a narrow portion 1 and a wide portion 2 are formed on a back substrate (see FIG. 7A).
[0055]
Next, a phosphor paste 4a containing a photosensitive material is used, and this phosphor paste 4a is applied to the entire concave groove 30 between the meandering partition walls 29 and the partition walls 29 and dried (FIG. 7B). reference). The photosensitive material is for removing a desired portion of the phosphor paste by a photolithographic technique, and various materials known in the art can be applied as the photosensitive material. The other components of the phosphor paste are the same as those in the first embodiment. Application of the phosphor paste 4a into the concave groove 30 is performed by screen printing.
[0056]
Next, exposure is performed using a photomask, and development is performed to remove the phosphor paste 4a in the narrow portion 1 (see FIG. 7C). The shape of the photomask is appropriately selected depending on whether a negative type or a positive type is used for the photosensitive material.
[0057]
The phosphor pace 4a is repeatedly applied, dried, exposed and developed for each color, and then baked to form the phosphor layers 28R, 28G, and 28B for each color in the wide portion 2 of the groove (FIG. 7 ( d)).
[0058]
In this case, in the above, the application, drying, exposure, and development of the phosphor paste 4a were repeated for each color. However, after all the phosphor pastes for each color were applied, they were dried and then exposed and developed at once. The phosphor paste 4a for each color in the narrow portion 1 may be removed at a time. The firing temperature of the phosphor paste is the same as in the first embodiment.
[0059]
As a result, it is possible to realize a structure in which the phosphor layer of the narrow part 1 is thin or the narrow part 1 has no phosphor layer at all.
[0060]
Compared with the first embodiment, the present embodiment uses a photolithographic technique, and therefore has an advantage that the phosphor layer can be formed only on the wide portion 2 with high accuracy.
[0061]
【The invention's effect】
According to the present invention, since the phosphor layer is formed only in the wide portion of the groove between the barrier ribs, that is, in the light emitting portion, a delta cell array PDP having high luminance and high discharge efficiency is manufactured. Can do.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a configuration of a PDP having a phosphor layer formed by using the phosphor layer forming method of the present invention, and is a partially exploded perspective view of the PDP.
FIG. 2 is an explanatory diagram showing a configuration of a PDP having a phosphor layer formed by using the phosphor layer forming method of the present invention, and is an explanatory diagram showing a partition when the PDP is viewed in plan.
FIG. 3 is an explanatory view showing a configuration of a PDP in which a phosphor layer is formed by using the phosphor layer forming method of the present invention, and shows the relationship among barrier ribs, display electrodes, and address electrodes when the PDP is viewed in plan. It is explanatory drawing shown.
FIG. 4 is an explanatory view showing Embodiment 1 of the phosphor layer forming method of the present invention.
FIG. 5 is an explanatory view showing an example in which a black pigment is added to a resin paste and fired.
6 is an explanatory view showing a KK cross section of FIG. 5. FIG.
FIG. 7 is an explanatory view showing Embodiment 2 of the phosphor layer forming method of the present invention.
FIG. 8 is an explanatory view showing a conventional phosphor layer forming method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Narrow part 2 Wide part 3 Resin paste 4, 4a Phosphor paste 6 Black pigment layer 11 Front side board | substrate 12 Transparent electrode 13 Bus electrode 17, 24 Dielectric layer 21 Back side board | substrates 28, 28R, 28G, 28B Phosphor Layer 29 Partition 30 Groove A Address electrode X, Y Display electrode

Claims (6)

In this method, a phosphor layer is formed in the concave groove of the panel substrate on which a plurality of barrier ribs are formed so that a narrow portion and a wide portion can be alternately formed in the concave groove between adjacent barrier ribs. And
Applying a resin paste that burns down by firing on the narrow part of the groove,
Applying phosphor paste containing phosphor powder, binder resin and solvent to at least the wide part of the groove,
Then, a phosphor layer forming method for a plasma display panel, comprising forming a phosphor layer in the concave groove by firing a resin paste and a phosphor paste.   The method for forming a phosphor layer of a plasma display panel according to claim 1, wherein the resin paste has a viscosity such that after application, the narrow portion of the concave groove is maintained by surface tension.   The method for forming a phosphor layer of a plasma display panel according to claim 2, wherein the resin paste comprises a binder resin and a solvent contained in the phosphor paste.   The method for forming a phosphor layer of a plasma display panel according to claim 1, wherein the resin paste contains a non-combustible black material.   The method for forming a phosphor layer of a plasma display panel according to claim 1, wherein the resin paste is applied to the narrow portion of the concave groove by a screen printing method. A phosphor layer forming method of the partition wall of claim 1, wherein a meandering shaped partition plasma display panel.

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