JP3393226B2 - Method and apparatus for forming phosphor layer on back panel of plasma display panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor for a plasma display panel back plate, which can efficiently produce a plasma display panel back plate which is a constituent unit of a plasma display panel as an image display device. The present invention relates to a layer forming method and apparatus.

[0002]

2. Description of the Related Art Plasma display panels (PD
P) is a flat panel, because it is larger, thinner, lighter, and capable of displaying high-definition images than CRTs.
Among displays (FPD), it has been attracting attention as a display for the next generation.

The constituent units of the PDP can be roughly classified into a front plate and a rear plate. In the cell structure diagram of the AC type color PDP of FIG. 6, 1 is a front plate and 10 is a rear plate. The front plate 1 is provided with a dielectric layer 5 and a protective layer 6 behind a front glass plate 2 with a common electrode 3 and a scanning electrode 4 interposed therebetween. The rear plate 10 has address electrodes 12 and a dielectric layer 13 on the front side of a rear glass substrate 11, and ribs (partitions) 14 are formed on the front surface of the dielectric layer 13 so as to partition the address electrodes 12. . In the cells 15 between the ribs 14, R phosphor layer (red phosphor layer) 20R, G phosphor layer (green phosphor layer) 20G, B phosphor layer (blue phosphor layer) 20R are provided.
B is provided. The top of the rib 14 is in contact with the protective layer 6.

The manufacturing process includes a front plate used mainly in thin film technology and photolithography technology used in semiconductor manufacturing technology, and a back plate manufactured by combining thin film / photolithography technology with thick film technology. It can be classified as a face plate.

It is the phosphor layer forming process that greatly affects the display quality of the PDP. In order to reduce the color unevenness of the entire display area of the PDP and to improve the brightness, it is of course necessary to improve the luminous efficiency of the phosphor material itself, and the phosphor layer can be uniformly formed in the spaces (that is, cells) between the ribs. Proper process is important. A screen printing method is mainly used as a method for forming the phosphor layer in the cells of the back plate, but in a situation where the PDP is further increased in size and the pattern is made finer. At present, it is becoming particularly difficult to adapt to the required accuracy and the cross-sectional shape of the phosphor layer.

A schematic diagram of a conventional phosphor layer forming method by screen printing is shown in FIG. 7 (where R phosphor layer 20R is used).
The case of forming is illustrated. ). In the figure, 60 is a screen (metal mask), which is a screen (metal mask).
An opening 61 is formed. 62 is a screen frame with a screen, and 63 is a squeegee.

FIG. 7A shows a state before the printing pressure is applied to the squeegee 63, and a screen clearance T is provided between the rib 14 formed on the rear glass substrate 11 and the screen 60. Then, as shown in FIG. 7B, by applying a printing pressure to the squeegee 63 and pushing the squeegee 63 and moving the squeegee 63 over the screen 60, the squeegee 63 is solidified from the screen (metal mask) opening 61 to become the R phosphor layer. Push out the phosphor paste 21R to be used by squeezing,
Cells 15 between ribs 14 formed on the rear glass substrate 11.
Then, the R phosphor layer 20R is formed in the cell 15 as shown in FIG.

FIG. 7 exemplifies the case where the R phosphor layer 20R is formed. In the case of a color PDP, R (Red; red).
For G (Green; green) and B (Blue; blue),
Print transfer formation is performed using a dedicated phosphor paste.

FIG. 8 shows an explanatory diagram of a process for forming three color RGB phosphor layers by the screen printing method. In the figure, 11 is a rear glass substrate, 14 is a rib, 15 is a cell, 60 is a screen, 61 is a screen opening, 62 is a screen frame, 6
3 is a squeegee.

In the R phosphor layer screen printing forming step # 11 of FIG. 8, first, R phosphor paste printing # 11-1 is executed, and in FIG. As shown in FIG.
The R phosphor paste 21R is transferred to each of the cells for forming the R phosphor layer 20R. And drying and baking # 1
1-2, R phosphor layer 2 by transfer of R phosphor paste
After drying and firing at 0R, the R phosphor layer is completed # 11-3.

Next, in the G phosphor layer screen printing forming step # 12, first, the G phosphor paste printing # 12-1 is executed, and the squeegee 63 is pressed by pushing the squeegee 63 as shown in FIG. 8C. As shown in (D) of the figure,
The G phosphor paste 21G is transferred to each G cell adjacent to the G phosphor cell to form a G phosphor layer 20G. Then, in the drying / baking # 12-2, the G phosphor layer 20G is dried and baked by transferring the G phosphor paste, and the RG phosphor layer completion # 12-3 is obtained.

Finally, in the B phosphor layer screen printing forming step # 13, first, B phosphor paste printing # 13-1.
Then, by applying printing pressure to the squeegee 63 and pushing in the squeegee 63 in the same figure (E) and squeezing, the B phosphor paste 21B is transferred to the B cells respectively as shown in the same figure (F). The phosphor layer 20B is formed. And dry and bake #
In 13-2, the B phosphor layer 20B is dried and baked by transferring the B phosphor paste, and the RGB phosphor layer rear plate completion # 13-3 is obtained.

The screen printing method is capable of performing film formation and patterning at the same time, is characterized in that waste of the paste is small and the manufacturing cost can be reduced relatively easily, and is widely used for pattern formation. Is the way.

However, using the screen printing method, the PD
When forming the phosphor layer of the P back plate, there are the following problems.

The pattern formation in screen printing in which it is difficult to control the film thickness of the phosphor layer is generally carried out by pressing with a squeegee printing pressure while the screen is in contact with the substrate to be printed or the like. . In the case of forming the phosphor layer, since the screen contacts only the head of the rib, it is impossible to directly contact the screen with the cell concave portion to which the phosphor paste is originally transferred. Therefore, it is very difficult to control the film thickness by the printing conditions alone, because the phosphor paste that has passed through the screen opening becomes "flow printing" due to the fluidity of the paste and its own weight.

In addition, the fluidity of the phosphor paste varies greatly depending on the viscosity, and the paste leveling state (flatness) in the cell is greatly influenced, which affects the thickness and uniformity of the thickness of the phosphor layer. To do.

Increasing the thickness of the phosphor layer is effective for improving the display brightness of the PDP, and for this purpose, it is necessary to increase the viscosity of the phosphor paste. However, in the case of high-viscosity paste, the leveling property and the paste transfer rate are reduced, and the variation in film thickness is increased. On the other hand, if the phosphor paste viscosity is lowered in order to improve the leveling property and transfer rate, the transferred paste will flow from the cell side surface (rib wall surface) to the cell bottom surface, and the phosphor layer on the cell side surface will become extremely thin and As with the viscous paste, the variation in film thickness increases. The present situation is that slight variations in the viscosity of the phosphor paste make the phosphor layer film thickness and cross-sectional shape non-uniform, making it difficult to control the film thickness under printing conditions.

Eventually, the variation in the film thickness of the phosphor layer and the non-uniformity of the cross-sectional shape directly affect the "color unevenness" of the PDP, resulting in a display quality deterioration factor.

In screen printing where there is a high risk of phosphor paste contamination, a clearance is required between the screen and the printing object in order to improve the plate separation from the printing object such as the substrate. Just stretched. This extension distorts the screen pattern dimension, and a pitch shift occurs between the rib pattern and the phosphor screen pattern, which causes a problem that the phosphor layer formation position with respect to the cell is displaced. In an extreme case, the phosphor paste may mix into the adjacent cells.

The screen itself is a plate in which a mesh made of stainless steel or polyester is adhered to the screen frame with high tension. When the screen is stretched by the squeegee every time it is printed, the tension is lowered and the pattern dimension is plastically deformed. This decrease in tension and plastic deformation are also major factors that deteriorate the accuracy of phosphor formation and the reproducibility. This is the fundamental problem of the screen printing method.

When the phosphor paste is "flow-printed" by the screen printing method, the screen is in contact with only the rib head, the screen on the cell is in a floating state, and the printing target portion (cell recess) is Because it is non-contact,
It is difficult to completely transfer (drop) the phosphor paste that has passed through the screen opening into the cell.

Further, in such non-contact screen printing, when the screen plate is released immediately after printing, a part of the incompletely transferred paste adheres as dirt to the back surface (cell surface) of the screen. , The screen moves away from the rib head. If printing is repeated with the paste attached to the back surface of the screen being imperfect due to this imperfect transfer, stains may accumulate on the back surface of the screen, stain the heads of the ribs, or mix the phosphor paste in adjacent cells, causing a problem of color mixing. Further, there is a problem that the adhered paste on the back surface of the screen influences and further reduces the phosphor paste transfer rate into the cell.

As a measure against this problem, a method of "cleaning" the back surface of the screen is generally performed by "discarding" a film or paper on a flat substrate every time printing is performed or when the back surface of the screen is soiled with paste. It has been implemented. However, it is generally difficult to completely remove the stain on the back surface of the screen by such a method, and it is generally accepted that the stain is easily accumulated even after cleaning.

As the size of the PDP becomes larger and the pattern area (display area) becomes wider proportionally, the clearance between the screen and the object to be printed is increased to secure the plate separation property in principle. It is necessary, and this increase in clearance tends to further increase the distortion of the screen pattern size, and as a result, the pattern printing accuracy tends to deteriorate. This phenomenon is the fundamental problem of the screen printing method.

In the screen printing method, it is generally accepted that a screen frame that is 4 to 6 times larger than the pattern effective area is used. When the PDP becomes large, it is necessary to further increase the screen frame size. The screen printing device automatically increases in size, leading to an increase in manufacturing cost.

[0026]

The technical elements required for the method of forming the phosphor layer of the PDP back plate are as follows.

(1) Large screen with high precision and high definition is easy. The PDP has a screen diagonal size of 20, 40, 50 inches and a display resolution of SVGA, XGA, HDTV. Are requested at the same time. Under such circumstances, it is necessary to form the phosphor layer of the back plate at the same time with a large substrate size, with high precision and narrow pitch.

However, in the conventional screen printing, the positional deviation due to the increase in the distortion of the screen pattern dimension due to the increase in the size of the substrate and the narrowing of the cell pitch can be avoided. Since the range is narrow and the printing state becomes more unstable, variations in the thickness of the phosphor layer increase, and it is difficult to achieve high precision and high definition.

(2) High brightness and no display unevenness The color PDP has R (red) G inside a cell partitioned by ribs.
A phosphor of three colors (green) B (blue) is a self-luminous display that utilizes the characteristic of emitting light by ultraviolet rays generated by gas discharge, and in order to improve the brightness (contrast) of the display, the phosphor is Various measures are being studied, including improving the luminous efficiency of the material itself.

As one of the measures, control of the thickness of the phosphor layer in the cell and the cross-sectional shape of the layer are also important factors in order to allow the phosphor to emit light efficiently.

To increase the brightness, it is effective to increase the absolute amount of the phosphor layer in the cell. However, if the phosphor layer is excessively increased, the gas discharge space in the cell becomes narrow and the discharge state becomes unstable. Become. Therefore, in order to improve the brightness in a state where the gas discharge is stable, it is not enough to control only the absolute amount of the phosphor layer in the cell, and the uniform film thickness (side surface of the rib) and the entire bottom surface of the cell ( A method capable of forming a phosphor layer having a cross section and forming a phosphor layer having a uniform film thickness over the entire display area is desirable.

However, in the conventional screen printing method, since the shape retention of the phosphor paste transferred in the cell is governed by the leveling property of the paste, many aspects cannot be controlled by the screen printing conditions alone. It is difficult to form a phosphor layer with a uniform film thickness on the entire cell on the cell side surface and the cell bottom surface.

In view of the above points, the present invention is capable of efficiently forming the phosphor layers of the back plate of the plasma display panel in a batch with good mass productivity, and moreover, the film thickness of the phosphor layers is easily controlled, and the film is formed. An object of the present invention is to provide a method and apparatus for forming a phosphor layer on a back plate of a plasma display panel, which can reduce the variation in thickness and make the film thickness in the cell uniform.

Other objects and novel features of the present invention will be clarified in the embodiments described later.

[0035]

In order to achieve the above object, a method for forming a phosphor layer for a back plate of a plasma display panel according to the present invention is provided in a cell between a plurality of ribs formed on a back substrate. In the case of forming a phosphor layer, a nozzle case having a cavity into which the phosphor paste is supplied, and the phosphor arranged at the tip of the nozzle case.
Photo-etched to match the cross-sectional shape of the layer
And a phosphor layer forming nozzle having a phosphor paste discharge port formed of an opening of a metal mask, the discharge port corresponding to a plurality of cells to be transferred, and the phosphor layer forming nozzle includes the rib. The non-contact state is moved on the back substrate, and the phosphor paste extruded from the ejection port by the pressurization and supply of the phosphor paste to the phosphor layer forming nozzle is transferred into the cell. The phosphor layer is simultaneously formed in the plurality of cells.

[0036]

A phosphor layer forming apparatus for a back plate of a plasma display panel according to the present invention has a structure in which a phosphor layer is formed in a cell between a plurality of ribs formed on a back substrate, and a phosphor paste is internally formed. There a nozzle case having a cavity supplied, are arranged in the nozzle casing tip and before
Photo etch to match the cross-sectional shape of the phosphor layer
And a phosphor layer forming nozzle having a phosphor paste discharge port formed of an opening of a metal mask formed by a plurality of holes, the discharge port corresponding to a plurality of cells to be transferred, and the phosphor layer forming nozzle. A phosphor paste supply unit that pressurizes and supplies the phosphor paste, and a nozzle drive unit that drives the phosphor layer forming nozzle so as to linearly move on the rear substrate in a non-contact state with the rib. The phosphor layer forming nozzle pushes out the phosphor paste from the discharge port and transfers it into the plurality of cells to simultaneously form a phosphor layer.

[0038]

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method and apparatus for forming a phosphor layer on a back plate of a plasma display panel according to the present invention will be described below with reference to the drawings.

1 to 5, an embodiment of the present invention (formation of a phosphor layer collectively by a nozzle extrusion transfer method) will be described. However, FIGS. 1 and 2 exemplify the case where the R phosphor layer 20R is formed. First, as shown in FIGS. 1 (A) and 2 (A), the ribs 14 are formed in parallel with the rear glass substrate 11 of the PDP back plate at equal intervals, and the cells 1 are formed between the ribs.
A rib substrate having No. 5 is prepared.

Next, as shown in FIGS. 1 (B) and 2 (B),
Using a phosphor layer forming nozzle 30 having a discharge port corresponding to each cross-sectional shape of the R phosphor layer 20R at the tip end corresponding to each cell 15 for the R phosphor layer, a phosphor paste supplying means described later in detail. Further, the R phosphor paste 21R is forcibly supplied to the phosphor layer forming nozzle 30 under pressure. As a result, the phosphor paste 21R in the nozzle that has received the pressure is forcibly extruded from each ejection port at the tip of the phosphor layer forming nozzle 30, and the extruded phosphor paste is formed on the substrate having the stripe rib pattern. Cells are transferred to the concave portions (that is, the bottom surface and both side surfaces) of the cell 15 and are continuously transferred by linearly moving the phosphor layer forming nozzle 30 with respect to the head of the rib 14 on the rear glass substrate 11 without contact. Go.

Then, on the upper surface of the rear glass substrate 11, the phosphor layer forming nozzle 30 is linearly moved within a required range, so that each cell for the R phosphor layer is as shown in FIGS. 1 (C) and 2 (C). The R phosphor layer 20R is collectively formed on 15 (simultaneously formed). After the formation, the rear glass substrate 11 is dried and baked to complete the R phosphor layer 20R.

In this case, the viscosity of the phosphor paste supplied under pressure can be sufficiently supplied to a high-viscosity paste excellent in shape retention, which cannot be transferred by the conventional screen printing method.

Although FIGS. 1 and 2 exemplify the case where the R phosphor layer 20R is formed, in the case of a color PDP, R (red).
For G (green) and B (blue), transfer forming is performed using dedicated phosphor pastes.

FIG. 3 shows RGB by the nozzle extrusion transfer method.
The explanatory view of a fluorescent substance layer formation process is shown. In the figure, 11 is a rear glass substrate, 14 is a rib, 15 is a cell, and 30 is a phosphor layer forming nozzle.

In the R phosphor layer nozzle forming step # 1 of FIG. 3, first, the R phosphor forming # 1-1 is executed, and then, FIG.
Then, by supplying the R phosphor paste 21R to the R phosphor layer forming nozzle 30 and moving the upper side of the substrate 11 to the rib head without contact, the R cell is formed as shown in FIG. The R phosphor paste is transferred to each to form the R phosphor layer 20R. Then, in the drying / baking # 1-2, the R phosphor layer 20R is dried and baked by transferring the R phosphor paste, and the R phosphor layer completion # 1-3 is obtained.

Next, in the G phosphor layer nozzle forming step # 2, first, the G phosphor forming # 2-1 is carried out, and then FIG.
Then, by supplying the G phosphor paste 21G to the G phosphor layer forming nozzle 30 and moving the upper side of the substrate 11 to the rib head in a non-contact manner, a G cell is formed as shown in FIG. The G phosphor paste is transferred to form the G phosphor layer 20G. Then, in the drying / baking # 2-2, the G phosphor layer 20G is dried and baked by transferring the G phosphor paste, and the G phosphor layer is completed # 2-3.

Finally, in the B phosphor layer nozzle forming step # 3, first, the B phosphor forming step # 3-1 is executed, and then, FIG.
Then, by supplying the B phosphor paste 21B to the B phosphor layer forming nozzle 30 and moving the upper side of the substrate 11 to the rib head in a non-contact manner, a B cell is formed as shown in FIG. The B phosphor paste is transferred to form the B phosphor layer 20B. Then, in the drying / baking # 3-2, the B phosphor layer 20B is dried and baked by transferring the B phosphor paste, and the RGB phosphor layer is completed # 3-3.

Although the phosphor layers are formed in the order of RGB in FIG. 3, the order of formation is arbitrary.

FIG. 4 shows details of the phosphor layer forming nozzle 30 used in the present embodiment. As shown in this figure, the phosphor layer forming nozzle 30 has a cavity 32 inside a nozzle case 31, A phosphor paste supply port 33 communicating with the cavity 32 and a phosphor paste discharge port 35 formed of an opening of a metal mask 34 arranged at the tip of the nozzle case are provided. The metal mask 34 is arranged on the bottom surface side of the cavity 32, and the opening of the metal mask 34, that is, the phosphor paste ejection port 35 has a shape that matches the cross-sectional shape of the phosphor layer. In the illustrated example, the discharge port 35 has a substantially U-shape that is angular. It should be noted that the metal masks 34A shown in FIG.
34B or the like can be used, and the metal mask 34
For example, A has a round U-shaped ejection port 35A, and the metal mask 34B has a linear slit-shaped ejection port 35B.

As shown in FIG. 5, a phosphor paste supply unit 40 as a phosphor paste supply unit forcibly supplying the phosphor paste to the phosphor layer forming nozzle 30 under pressure,
The phosphor paste supply port 33 of the phosphor layer forming nozzle 30 is connected by a pipe 50, and a built-in screw 41 is rotated to pressurize the phosphor paste from the phosphor paste supply unit 40 to the phosphor layer forming nozzle 30. It is forcibly sent. As a result, one of the phosphor pastes 21R, 21G, and 21B is forcibly extruded from each ejection port 35 at the tip of the phosphor layer forming nozzle 30 and transferred to a predetermined cell.

In this case, the cross-sectional shape and the film thickness of the phosphor layer can be controlled by the shape of the metal mask opening (discharge port 35) attached to the tip of the phosphor layer forming nozzle 30. The shape of the mask opening is photo-etching, which can be arbitrarily and highly accurately manufactured. Furthermore, fine control of the phosphor layer thickness and cross-sectional shape can be easily performed by controlling the amount of phosphor paste pushed out by the pressurizing condition and varying the moving speed of the nozzle.

According to this embodiment, the following effects can be obtained.

(1) The phosphor layer forming method of this embodiment is required to manufacture a highly precise PDP with high accuracy such as the cross-sectional shape of the phosphor layer, the cell pitch, and the accuracy of the entire pattern. The precision is directly determined by the photoetching precision of the opening of the metal mask 34 attached to the tip of the phosphor layer forming nozzle 30. Photo-etching is a processing method capable of sufficiently realizing the manufacturing accuracy required for the PDP back plate, and as a result, it becomes possible to form the phosphor layer with high accuracy. Further, according to the present embodiment, the distortion of the entire display pattern is small, and the phosphor layer can be formed with extremely high reproducibility.

(2) In the conventional phosphor layer forming method by screen printing, it is difficult to control the uniformity of the film thickness and the cross-sectional shape by the printing conditions alone in order to improve the luminous efficiency of the phosphor layer. . The cross section of the phosphor layer formed by screen printing has a shape that is disadvantageous for improving the luminous efficiency of the phosphor because the cell side surface (rib wall surface) is thin and the cell bottom surface is likely to be thick due to the leveling of the phosphor paste.

However, in the phosphor layer forming method according to the present embodiment, the cross-sectional shape of the phosphor layer for efficiently emitting the phosphor is determined by the shape of the metal mask opening at the nozzle tip of the phosphor layer forming nozzle 30. As a result, it is possible to easily develop, the degree of freedom in controlling the cross-sectional shape of the phosphor layer and the film thickness is increased, and as a result, it is possible to realize a PDP with high luminous efficiency.

(3) The shape of the opening of the metal mask 34 that defines the cross-sectional shape of the phosphor layer can be manufactured by photoetching arbitrarily and with high precision. Further, the amount of phosphor paste extruded depending on the pressurizing condition. By controlling the above and varying the moving speed of the phosphor layer forming nozzle 30, fine adjustment of the phosphor layer film thickness and cross-sectional shape can be easily performed.

(4) Phosphor layers of the same color can be collectively formed on each cell 15 of the rear glass substrate 11, mass productivity is good, and the PDP can be easily enlarged.

In the embodiment, the nozzle driving means for linearly moving the phosphor layer forming nozzle 30 without contacting the head of the rib 14 on the rear glass substrate is, for example, a phosphor layer forming nozzle on the piston rod side. It can be realized by a mechanism such as an air cylinder for attaching 30 and linearly moving it.

Further, although the phosphor layer forming nozzle 30 is illustrated so that the discharge port 35 is directly opposed to the substrate surface, the phosphor layer forming nozzle 30 is inclined with respect to the traveling direction as indicated by a virtual line Q in FIG. You may move as a state.

Further, the phosphor paste supply unit 40 which pressurizes and supplies the phosphor paste to the phosphor layer forming nozzle 30 has a structure in which the phosphor paste is mechanically pressed by a screw, a pump or the like, and the inside of the hermetically sealed container is filled with gas or the like. A configuration in which pressure is applied to supply is possible.

The movement of the phosphor layer forming nozzle 30 with respect to the rear glass substrate 11 may be a relative movement, and the rear glass substrate 11 is moved without changing the position of the phosphor layer forming nozzle 30. It is self-evident that the present invention also covers.

Although the embodiment of the present invention has been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Ah

[0064]

As described above, according to the present invention,
The following effects can be achieved.

(1) High definition, high accuracy, high reproducibility In the present invention, it is required to manufacture a high definition PDP with high accuracy such as the cross-sectional shape of the phosphor layer, the cell pitch, and the accuracy of the entire pattern. Accuracy is directly determined by the processing accuracy of the phosphor paste discharge port at the tip of the phosphor layer forming nozzle by photoetching . When the discharge port is formed of a metal mask opening, the photo etching accuracy of the opening is P
The processing accuracy is sufficient to realize the manufacturing accuracy required for the DP back plate, and as a result, the phosphor layer can be formed with high accuracy. Further, according to the present invention, the distortion of the entire display pattern is small, and the phosphor layer can be formed with extremely high reproducibility.

(2) Improvement of Luminous Efficiency In the conventional phosphor layer forming method by screen printing, in order to improve the luminous efficiency of the phosphor layer, it is not possible to make the film thickness uniform or control the cross-sectional shape by printing conditions alone. Have difficulty. The cross section of the phosphor layer formed by screen printing has a shape that is disadvantageous for improving the luminous efficiency of the phosphor because the cell side surface (rib wall surface) is thin and the cell bottom surface is likely to be thick due to the leveling of the phosphor paste.

However, in the present invention, the cross-sectional shape of the phosphor layer for allowing the phosphor to efficiently emit light can be easily developed as the shape of the discharge port (for example, the metal mask opening) at the tip of the phosphor layer forming nozzle. Further, the degree of freedom in controlling the cross-sectional shape of the phosphor layer and the film thickness is increased, and as a result, it is possible to realize a PDP with high luminous efficiency.

[Brief description of drawings]

FIG. 1 is a schematic view seen from the front for explaining an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is an explanatory diagram in the case of forming phosphor layers of three colors of RGB in the embodiment.

FIG. 4 is an exploded perspective view of a phosphor layer forming nozzle used in the embodiment.

FIG. 5 is a schematic diagram of a side cross section of a phosphor paste supply state using a phosphor paste supply unit by screw pressing in the embodiment.

FIG. 6 is a perspective view showing an AC type color PDP cell structure.

FIG. 7 is a schematic diagram illustrating formation of a phosphor layer by a conventional screen printing method.

FIG. 8 shows RGB 3 in a conventional screen printing method.
It is explanatory drawing at the time of forming a fluorescent substance layer of color.

[Explanation of symbols]

1 Front plate 10 Back plate 11 Rear glass substrate 14 ribs 15 cells 20R, 20G, 20B phosphor layer 21R, 21G, 21B phosphor paste 30 Phosphor layer forming nozzle 31 nozzle case 32 cavities 33 Phosphor paste supply port 34, 34A, 34B Metal mask 35 outlet 40 Phosphor paste supply unit 50 piping

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 9/227

Claims (2)

(57) [Claims] 1. A plasma display for forming a phosphor layer in a cell between a plurality of ribs formed on a back substrate.
In the phosphor layer forming method of the panel back plate, a nozzle case having a cavity into which the phosphor paste is supplied,
It is arranged at the tip of the nozzle case and the phosphor layer is disconnected.
And a phosphor paste discharge port formed of an opening of a metal mask formed by photoetching so as to match the surface shape , and the discharge port corresponds to a plurality of cells to be transferred. A layer forming nozzle is used, the phosphor layer forming nozzle moves on the rear substrate in a non-contact state with the rib, and the phosphor paste is ejected by pressurizing and supplying the phosphor layer forming nozzle to the phosphor layer forming nozzle. A method for forming a phosphor layer on a rear panel of a plasma display panel, comprising: transferring a phosphor paste extruded from an outlet into the cell to simultaneously form a phosphor layer in the plurality of cells. 2. A plasma display, wherein a phosphor layer is formed in a cell between a plurality of ribs formed on a back substrate.
In a phosphor layer forming apparatus for a panel back plate, a nozzle case having a cavity into which a phosphor paste is supplied,
It is arranged at the tip of the nozzle case and the phosphor layer is disconnected.
And a phosphor paste discharge port formed of an opening of a metal mask formed by photoetching so as to match the surface shape , and the discharge port corresponds to a plurality of cells to be transferred. A layer forming nozzle, a phosphor paste supplying unit that pressurizes and supplies a phosphor paste to the phosphor layer forming nozzle, and the phosphor layer forming nozzle is a straight line in a non-contact state on the rear substrate with the rib. And a nozzle driving unit that is driven to move, wherein the phosphor layer forming nozzle pushes out a phosphor paste from the ejection port and transfers the phosphor paste into the plurality of cells to simultaneously form a phosphor layer. A device for forming a phosphor layer on the back plate of a plasma display panel.