JP3244483B2 - Method and apparatus for applying phosphor ink to discharge chamber of 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 method for manufacturing a display panel used for a display device or the like, and more particularly, to a method and an apparatus for forming a phosphor layer of a display panel.

[0002]

2. Description of the Related Art Before describing a conventional plasma display panel, the structure of an ideally constructed plasma display panel will be described with reference to FIG. FIG. 10 is a schematic sectional view of an AC type (AC type) plasma display panel. In FIG. 10, a display electrode 201 is provided on a front cover plate 200 which is a front glass substrate. Further, a dielectric glass layer 202 is provided on the surface of the display electrode 201, and the surface is further covered with a dielectric protection layer 204 formed of magnesium oxide (MgO). Note that the dielectric protection layer 204
Are configured such that the crystal orientation of MgO is oriented. Usually, the MgO dielectric protection layer 204 is formed by a vacuum deposition method in which magnesium oxide, which is a main raw material, is heated by an electron beam, as proposed in, for example, Japanese Patent Application Laid-Open No. Hei 5-342991.

An address electrode 206 and a partition 207 are provided on a back plate 205 which is a back glass substrate.
A phosphor layer 208 is provided. The discharge chamber 209 is formed by sealing the open surface end of the partition wall 207 of the back plate 205 thus configured. By discharging a discharge gas between the display electrode 201 and the address electrode 206 constituting the electrode layer in a state where the discharge gas is sealed in the discharge chamber 209, a monochrome display corresponding to one pixel is obtained.

Conventionally, screen printing is mainly used for forming the electrode layers (display electrodes and address electrodes). To form a phosphor layer, for example, see
A screen printing method as disclosed in JP-A-162019, an ink-jet method as disclosed in JP-A-53-79371, or
As disclosed in Japanese Patent No. 273925, a photoresist film method is used.

The brightness of a panel conventionally developed as a plasma display panel is described in, for example, Functional Materials Magazine, February, 1996, Vol. 16, No. As shown on pages 2 and 7, a 40-inch NTSC panel (640 × 480 cells with a cell pitch of 0.43 mm × 1.
29mm, 1 cell area about 0.55mm2), about 250c
d / m2

[0006]

In recent years, expectations for high-definition televisions and other high-definition televisions with large screens have been increasing. A cathode ray tube (CRT) is superior to a plasma display and a liquid crystal in terms of resolution and image quality, but is not suitable for a large screen of 40 inches or more in terms of depth and weight. On the other hand, liquid crystal has excellent features such as low power consumption and low driving voltage, but has limitations in screen size and viewing angle. On the other hand, a plasma display can realize a large screen. For example, a functional material magazine, February 1996, Vol. 16, No. 2,7
As described on the page, a 40-inch class product has already been developed.

[0007] The brightness of the plasma display currently commercialized is helium-xenon (He-Xe) or neon-xenon (Ne-Xe) sealed in a discharge chamber.
The luminance level depends on the intensity of ultraviolet rays generated by discharging in an atmosphere of a system gas. Especially He
In the discharge in the -Xe-based gas, vacuum ultraviolet rays having a wavelength of 147 nm due to the resonance line of Xe are emitted.
The green and blue ultraviolet-excited phosphors are excited to emit light. This is described in Applied Physics Magazine Vol. 51, No.
3, 1982, pp. 334-347, or Optical Technology Contact Vol. 34, no. 1, 19
1996, 25 pages or NHK Technical Journal No. 3
1, Vol. 1, No. 1, 1979, p.

A current 40-42 inch class plasma display is disclosed in, for example, Functional Materials Magazine, 1996
Monthly Vol. 16, No. As described on pages 2 and 7, the number of pixels is 640 × 480 and the cell pitch is 0.4.
3 mm x 1.29 mm, and the area of one cell is 0.55 m
It has a pixel level of m2. Furthermore, the pixel level of the full-spec high-definition television which is expected in recent years is 1920 × 1125, the cell pitch is 0.15 mm × 0.48 mm in a 42 inch class, and the area of one cell is 0.072 mm 2. become. Accordingly, the cell pitch and the area per cell become smaller as compared with the conventional NTSC as the definition of the plasma display advances, so that a high-precision phosphor film forming technique for improving the luminance is desired. .

However, in the case of applying the phosphor by the screen printing method, the phosphor layer 208 is provided between the two partition walls 207.
When the phosphor ink is filled, there is a problem that the screen plate is deformed, and the phosphor ink enters the adjacent partition walls to cause color mixing.

Considering the fine cells, the phosphor coating by the screen printing method requires a partition wall pitch of 0.1 mm.
From 0.15 mm to 0.15 mm, since the partition walls have a width, the space filled with the phosphors has a very narrow width of about 0.1 mm to 0.08 mm, and the viscosity is high precisely and quickly by the printing method ( (Tens of thousands of centipoise) It becomes difficult to pour the phosphor ink. As a result, the phosphor ink cannot completely cover the back plate 205 and the address electrodes 206.

In the phosphor photo film method or the phosphor photo paste method using a phosphor and an ultraviolet photosensitive resin, the back plate 20 is embedded with a certain degree of accuracy between the partition walls.
5 (including the address electrode 206) can be filled. However, it is necessary to repeat the exposure and development process for each of the three colors, and there are problems such as color mixing due to undeveloped portions and difficulty in collecting expensive phosphor materials.

As a phosphor coating method which can solve such problems, Japanese Patent Application Laid-Open No. 53-79371 and Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. -162019 discloses an ink jet method in which a desired pattern is drawn on a substrate by ejecting a phosphor ink from a pressurized nozzle. In addition, the applicant of the present application has already filled and drawn the phosphor between the partition walls while continuously ejecting the phosphor ink having good fluidity from the fine nozzles as shown in Japanese Patent Application No. 8-245585. Suggest a way. However, even such a method has the following problems.

That is, in the above-described method, the partition 2
07 is assumed to be linear and its accuracy is also ensured. However, the linearity of the partition wall 207 cannot be said to be guaranteed, depending on the method of manufacturing the partition wall. In particular, the linearity of the partition walls and the distance between the partition walls differ greatly depending on the case of forming by a printing method or the glass distortion in the firing step.

In the case where the pitch between partition walls is made fine for a high-definition screen and ink is continuously filled as described above, it is necessary to make the nozzle hole diameter smaller than the pitch between partition walls. However, in reality, the diameter of the nozzle cannot be so fine due to the relationship between processing accuracy and ink flow. Therefore, the difference between the opening of the partition and the nozzle opening becomes smaller,
There is a problem that the phosphor ink is placed on the upper part of the partition walls due to a slight undulation of the partition walls or is filled between the adjacent partition walls to cause color mixing.

If the same amount of ink is always filled due to the undulation of the partition walls or the size of the partition spacing, the phosphor ink overflows in the area where the partition spacing is small, causing serious defects such as flowing into adjacent partitions and causing color mixing. is there. In view of the above, an object of the present invention is to provide a method and an apparatus for manufacturing a plasma display panel capable of forming a phosphor layer on a plasma display panel inexpensively and accurately.

[0016]

According to a first aspect of the present invention, a plurality of partition walls are formed adjacent to each other at a predetermined pitch.
Separated by two adjacent partitions on a broken glass substrate
In each space, multiple nozzles provided in the nozzle head
A phosphor ink applying apparatus that ejects phosphor ink from the tip, while maintaining the tip Gaga glass substrate and a predetermined relative position Roh nozzle, then generally centered between barrier ribs to phosphor ink is applied to a driver for driving the nozzle head so as to move a partition wall detector for detecting the adjacent pitch and septal wall of each position, based on the adjacent pitch is detected and the position of the test out septum, As the tips of the plurality of nozzles move along the partition, a drive controller that controls the positioning of the tips of the plurality of nozzles of the driver following the shape of the partition, and according to the shape of the partition. , Fireflies from multiple nozzles
Phosphor ink ejection amount control to control the ejection amount of optical ink
And a container .

As described above, in the first aspect, since the nozzle tip is positioned based on the actual position and pitch of the partition wall detected by the partition wall detector, the partition wall temporarily deviates from the prescribed shape. Even so, the nozzle can be correctly moved. Also, depending on the space partitioned by the partition
Discharge the phosphor ink at a constant rate
A homogeneous phosphor ink layer can be formed. Further
Since multiple nozzles are provided, multiple
The phosphor ink can be efficiently applied to the space.

[0018] The second aspect based on the first aspect, septal wall detector, characterized in that you detect the position and the adjacent pitch of the entire barrier ribs formed on the glass substrate prior to application of the phosphor ink And

As described above, in the second aspect of the invention, the position of the entire partition and the adjacent pitch are detected in advance, so that the phosphor ink application operation can be speeded up.

[0020] A third aspect based on the first aspect, septal wall is characterized in that it is formed in a stripe shape.

[0021] A fourth aspect based on the third aspect, the nozzle of several double is characterized in that a plurality of which discharges phosphor ink of the same color are driven integrally.

As described above, according to the fourth aspect of the present invention, a plurality of nozzles for ejecting the same color phosphor ink are integrally driven, so that different phosphor inks are mixed between the wrong partitions by ejection. Can be prevented.

The fifth invention, in the fourth aspect, the number of double
Nozzle of this is provided on the nozzle head at a predetermined pitch, the nozzle head rotator for rotating the nozzle head within a plane in which the gap of the nozzle head and the septum walls in the same
In addition, the drive controller detects the center of the nozzle head
Nozzle head rotator located in the center between the
Adjusts the rotation angle of the nozzle head according to the shape of the partition
By the nozzle position, characterized in that is positioned in the center between the barrier ribs.

[0024] In a sixth aspect based on the fourth aspect, a plurality of
The nozzles are provided on the nozzle head at a predetermined pitch.
Surface with the same gap between the nozzle head and the partition wall
A nozzle head rotator that rotates the nozzle head within
In addition, the nozzle head rotator is used to
The feature is to adjust the rotation angle of the nozzle head according to
And

As described above, in the fifth and sixth aspects, the nozzle position can be effectively adjusted even when the plurality of partition walls are entirely out of the predetermined shape.

According to a seventh aspect of the present invention, a plurality of nozzles provided in a nozzle head are provided in a space partitioned by two adjacent partitions on a glass substrate having a plurality of partitions formed adjacently at a predetermined pitch. A phosphor ink application method for ejecting phosphor ink from a tip, wherein a tip of a nozzle moves to a substantially center between partition walls to which phosphor ink is to be applied next, while maintaining a predetermined relative position to a glass substrate. A driving step of driving the nozzle head so as to perform, a partition detection step of detecting a position and an adjacent pitch of each partition, and a tip of a plurality of nozzles based on the detected position of the partition and the detected adjacent pitch. so they move along the partition wall, a drive control step of controlling the positioning of a plurality of the of the nozzle tip of the nozzle head to follow the shape of the partition wall, according to the shape of the partition wall , And a phosphor ink discharge amount control step of controlling the discharge amount of the phosphor ink from a plurality of nozzles.

As described above, in the seventh aspect , the nozzle tip is positioned based on the actual position and pitch of the partition wall detected by the partition wall detector, so that the partition wall temporarily deviates from the prescribed shape. Even so, the nozzle can be correctly moved. Also, depending on the space partitioned by the partition
By discharging phosphor ink at a fixed rate,
A uniform phosphor ink layer can be formed. Further
Since multiple nozzles are provided, multiple
The phosphor ink can be efficiently applied to the space.

The eighth aspect of the present invention, in the seventh, septal wall detection step, the partition walls overall position formed on a glass substrate
Position and adjacent pitch before application of the phosphor ink.
Ku, characterized in that.

As described above, in the eighth invention, the position of the entire partition and the adjacent pitch are detected in advance, so that the phosphor ink application operation can be speeded up.

[0030] A ninth aspect of the invention of the seventh, Nozzle <br/> Le is a plurality of each phosphor ink of the same color, characterized in that it is driven integrally.

As described above, in the ninth aspect of the present invention, by driving a plurality of nozzles for ejecting the same color phosphor ink integrally, different phosphor inks are mixed between wrong partition walls by ejection. Can be prevented.

[0032] In a tenth aspect based on the ninth invention, the nozzle of the double <br/> this number is arranged on the nozzle head at a predetermined pitch and the gap of the nozzle head and the septum walls in the same A nozzle head rotating means for rotating the nozzle head in a plane.
The drive control step further includes a nozzle head.
The center of the nozzle is located at the center between the detected
The head rotation step depends on the shape of the partition wall.
By adjusting the rotation angle of de, the nozzle position, characterized in that is positioned in the center between the barrier ribs.

An eleventh invention is the ninth invention, wherein
Several nozzles are provided on the nozzle head at a predetermined pitch
And the gap between the nozzle head and the partition was made the same.
A nozzle head rotating means for rotating the nozzle head in a plane.
Further comprising a step, wherein the step of rotating the nozzle head comprises:
Adjust nozzle head rotation angle according to wall pitch fluctuation
It is characterized by doing.

As described above, in the tenth and eleventh aspects, the nozzle position can be effectively adjusted even when the plurality of partition walls are entirely out of the predetermined shape.

According to a twelfth aspect, the first electrode is provided.
The front glass substrate and the second electrode are adjacent at a predetermined pitch.
Fluorescent light in each of the partitions and the spaces partitioned by the partitions.
Seals the back glass substrate on which the body layer is formed so as to face each other
Method for manufacturing a plasma display panel
And forming the phosphor layer by any one of the seventh to eleventh inventions.
It is characterized by the following.

As described above, in the twelfth aspect,
For the formation of phosphor layers in the production of plasma display panels
On the other hand, any one of the seventh to eleventh inventions can be used.
Wear.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a plasma display panel PDP manufactured by a manufacturing method and apparatus according to the present invention will be described with reference to FIG. (Overall Configuration and Manufacturing Method of PDP) As shown in FIG. 1, a schematic sectional view thereof shows an AC discharge type plasma display panel PDP according to an embodiment of the present invention.
Is configured by arranging a large number of cells that emit light of each color of R (red), G (green), and B (blue).

The plasma display panel PDP has a front panel FP in which display electrodes 12 serving as discharge electrodes, a dielectric glass layer 13 and a magnesium oxide protective layer 14 are arranged on a front glass substrate 11. The plasma display panel PDP further has a back panel BP in which address electrodes 16, partition walls 17, and phosphor layers 18 are arranged on a back glass substrate 15. The magnesium oxide protective layer 14 of the front panel FP, the partition wall 17 of the rear panel BP, and the phosphor layer 18 (including the address electrode 16 and the phosphor layer 1)
8) A discharge gas is sealed in the discharge chamber 19 formed during the step 8). This plasma display panel PDP
Is manufactured as described below.

(Front Panel FP) The front panel FP has a display electrode 1 on a front glass substrate 11.
2 is formed, and is covered with a lead-based dielectric glass layer 13, and a magnesium oxide protective layer 14 is formed on the surface of the dielectric glass layer 13. In this embodiment, the display electrode 12 is a silver electrode, and a silver electrode ink containing an ultraviolet-sensitive resin is uniformly applied on the front glass substrate 11 by a screen printing method, dried, and then patterned by exposure and development. And baking. The dielectric glass layer 13 is formed by screen printing and baking. The magnesium oxide protective layer 14 is made of magnesium oxide, and is formed by a sputtering method, a vacuum evaporation method, or the like.

(Back Panel BP) In the back panel BP, address electrodes 16 are formed on a rear glass substrate 15, and stripe-shaped partitions 17 made of glass are formed thereon at a predetermined pitch. It is manufactured by forming a phosphor layer 18 of a red phosphor, a green phosphor, and a blue phosphor in each of the spaces defined. In the present embodiment, the address electrode 16 is a silver electrode, and a silver electrode ink containing an ultraviolet-sensitive resin is applied on the rear glass substrate 15 by screen printing.
After being uniformly coated on the substrate 5 and dried, it is formed by patterning by exposure and development and baking.

The partition wall 17 may be formed by repeatedly printing several times by a screen printing method, or may use a so-called sand blast method, a lift-off method, or the like.
The phosphor layer 18 is formed by applying a red phosphor, a green phosphor, and a blue phosphor to each space sandwiched by the partition walls 17 by an ink discharge method.

As the phosphor of each color, a phosphor generally used for a plasma display panel can be used. Here, a phosphor having a composition represented by the following chemical formula is used. Red phosphor: (YXGd1-X) BO3: Eu3 + or YBO3: Eu3 + Green phosphor: BaAl12O19: Mn or Z
n2SiO4: Mn Blue phosphor: BaMgAl10O17: Eu2 +

(Plasma Display Panel PDP) The plasma display panel PDP is produced by laminating the front panel FP and the rear panel BP produced as described above as follows. The front panel FP and the rear panel BP are adhered to each other using a sealing glass, and a high vacuum (8
After evacuating to 10-7 Torr, a discharge gas of a predetermined composition is sealed at a predetermined pressure to produce a plasma display panel.

The composition of the discharge gas to be charged is a conventional Ne--Xe system, but the content of Xe is set to 5% by volume or more, and the charging pressure is 500 to 800 Torr.
Set to the range of r. In FIG. 1, for convenience of explanation, the front panel is shown rotated by 90 degrees unlike the actual case.

Hereinafter, a method for forming the phosphor layer according to the present embodiment will be described with reference to FIGS. 2, 3, 4, and 5. First, a principle method of forming a phosphor layer in each space partitioned by the partition wall 17 will be described with reference to FIG.
As shown in FIG. 2, the ink ejection device Aic used for forming the phosphor layer of the plasma display panel includes a nozzle 21 for ejecting the phosphor ink 20,
It includes a server 22 for supplying the phosphor ink 20 to the nozzles 21 and a pressurizer 23 for applying pressure to the nozzles 21.

First, the phosphor ink 20 of a specific color is put into the server 22 and pressure is applied by the pressurizer 23.
From 1 the phosphor ink 20 is discharged as a continuous flow Fc. At this time, the center of the nozzle 21 is
The phosphor ink 20 is filled between the partition walls 17 at the center between the stripe-shaped partition walls 17 provided on the substrate.

FIG. 3 shows a plasma display panel PD.
1 shows a schematic configuration of an ink application device Aia used for manufacturing P. In the ink applying apparatus Aia, the rear glass substrate 15 is placed on the main body base 28, and the driving apparatus (not shown) linearly reciprocates on the rail 30 on the base 28 in the direction of arrow Dy. The movement in the direction of the arrow Dy is called Y-axis movement. At this time, the rear glass substrate 15 is placed on the base such that the stripe-shaped partition walls 17 provided on the rear glass substrate 15 are parallel to the linear reciprocating motion as the Y-axis motion.

On the other hand, an arm 33 is provided in the ink coating device Aia so as to be orthogonal to the partition wall 17. The nozzle 21 or the ink ejection device Aic shown in FIG. 2 is installed on the arm 33, and reciprocates linearly in an arrow Dx direction substantially perpendicular to an arrow Dy direction. The movement in the direction of the arrow Dy is referred to as X-axis movement.

In these movement operations, the command from the control device 36 is transmitted by the cable 37 for the Y-axis movement,
8. Ink applicator Aia
When the rear glass substrate 15 moves at a high speed in one direction of the arrow Dy, the phosphor ink 20 is filled between the nozzle 21 and a predetermined partition wall shown in FIG. At this time, the ink application device Aia is moved in one direction of the arrow Dy, and the phosphor ink 20 is filled between the adjacent partition walls or another predetermined partition wall. By this repetitive operation, the phosphor ink 20 is filled between the partition walls 17 provided on the entire surface of the rear glass substrate 15.

The application of the phosphor inks 20 corresponding to each of the three colors is completed by first applying the phosphor ink 20 of one color to all the portions of the rear glass substrate 15 between the partitions 17 corresponding to the colors. After that, the phosphor ink 20 of the next color may be similarly applied between the partition walls 17 corresponding to the color. On the other hand, it goes without saying that ink applicators Aia for three colors may be installed on the arm and applied simultaneously between the partitions 17 corresponding to each color.

Next, with reference to FIG. 4, the relationship between the nozzle 21 and the partition wall 17 in the ink application device Aia for discharging the phosphor inks 20 for three colors will be described. Partition wall 17
Are several hundred to several thousand depending on the definition of the screen.
For this purpose, it is important to improve the work efficiency by integrating a plurality of application nozzles 21 and to reduce the time required for applying the phosphor ink 20. FIG. 4 shows an example in which three nozzles are grouped together. The nozzle head body 39 has a header 40 for the purpose of distributing the phosphor ink 20 and equalizing the pressure. A nozzle 21 having a fine hole diameter is provided below the header 40.

Although not shown in FIG. 4 for visibility, the nozzle 21 is connected to the server 22 and the pressurizer 23 shown in FIG. The distance L between the rear glass substrate 15 located below the nozzle head 39 and the upper end of the partition wall 21 depends on conditions, but is 2 to 3 mm. Further, the nozzle diameter Dn is determined by the partition pitch and the partition width, or the amount of ejected ink, and is approximately several tens to 100 μm.

When the pitch between adjacent partition walls 17 is P,
Since phosphors of three colors of R, G, and B are alternately applied to each partition space, the nozzle pitch for ejecting the phosphor ink 20 of the same color is 3 × P. The position of each substrate of the ink application device Aia is initially set so that each of the grouped nozzles 21 is located at the center between the partition walls 17. Thereafter, the phosphor ink is filled between the partition walls by the ejection operation described with reference to FIG.

The nozzle head body 3 is moved by the reciprocating movement of the substrate.
9 is in the direction of the arrow Dy, and in FIG.
(No. of nozzles) × 3 (number of colors) × P (pitch between partition walls), each nozzle is positioned at the center between partition walls, and the phosphor ink 20 is supplied by the continuous flow Fc of phosphor ink.
Is filled in the space Sp between the partition walls 17. As described above, the feed amount Yf in the Y-axis direction of the ink ejection device Aic that simultaneously ejects the plurality of nozzles 21 that apply the phosphor inks 20 of the plurality of colors collectively.
Is Yf, where Nn is the number of nozzles and Nc is the number of colors.
= Nn × Nc × P.

In the method described above, the feed amount Yf of the nozzle head is always moved by the same distance, assuming that the partition walls 17 are formed at a uniform pitch over the entire surface of the substrate. However, in practice, the accuracy of the partition is shifted by about several tens of μm when it is large.

Referring to FIGS. 5 and 6, a typical example in which the accuracy of the partition wall is not ensured will be described. FIG. 5 shows a state of the partition wall when the glass shrinks in a heat treatment step or the like. FIG. 6 shows a state in which the partition wall pattern itself is distorted. The partition wall 17 having such non-uniformity may be excluded as a defect in the partition wall forming step depending on the degree thereof. However, even when the partition wall accuracy itself is appropriate, the non-uniformity of the partition wall 17 often causes a significant inconvenience in the phosphor coating process. For example, in the case of the NTSC level definition, if the partition pitch P is 360 μm and the partition width Wp is 100 μm,
The distance Lp between the partition walls is 260 μm. Further, assuming that the nozzle diameter Dn is 100 μm, the distance D between the partition and the nozzle end is D
Although ps has a margin of 80 μm, in actuality, variations in the processing accuracy of the nozzle 21, variations in the partition wall width Wp,
The margin (Dps) is considerably small due to pattern variations and the like.

This phenomenon is caused by a high definition resolution, for example, XGA
And it becomes more and more remarkable at the HD level. In such a situation, even in the above-described method, a phosphor coating defect such as the phosphor ink being applied to the partition walls or entering between adjacent partition walls may occur. In addition, the non-uniformity of the partition wall 17 as shown in FIGS. 5 and 6 often occurs rather as a tendency on the entire surface of the substrate, but it may occur in a part thereof due to a defect such as a mask. Have difficulty.

First Embodiment With reference to FIG. 7, an ink application apparatus Aia1 according to a first embodiment of the present invention will be described. Ink applicator Ai
In the configuration of a1, the arm 33 of the ink application device Aia shown in FIG. 3 is provided with a partition wall detection device 46 in addition to the ink ejection device Aic. When the ink ejection device Aic is sent as a whole in the X-axis direction indicated by the arrow Dx, the partition wall detecting device 46 detects in advance the position Pp of the partition wall 17 to which the phosphor ink 20 is to be applied next and the distance Lp between the partition walls 17. Then, the detection result is input to the control device 36. Control device 36
Performs feedback control of the position of the ink ejection device Aic based on the input position Lp of the partition wall 17 to correct the feed of the ink ejection device Aic in the X-axis direction (Dxf and Dxr) in both directions indicated by an arrow Dx. Thus, control is performed following the shape of the partition wall 17.

The ink ejection device Ai on the arm 33
It is desirable that the feed mechanism of c and the feed mechanism of the detection device 46 be independent of each other. In addition, the ink ejection device Aic
, A partition detection device is provided in the traveling direction of the substrate (arrow Dy), that is, before and after the head, and the feed correction by the feedback control in the X-axis feed so that the center of the head 40 is always located at the center between the partitions. May be applied. The ink applicator Aia1 according to the present embodiment is effective when the entire partition wall has the same tendency and is not a straight line as shown in FIG. Various methods can be applied as a method for detecting the position of the partition wall, such as using an optical sensor or a sensor for detecting a change in dielectric constant.

(Second Embodiment) With reference to FIGS. 8 and 9, an ink application apparatus Aia2 according to a second embodiment of the present invention will be described. The ink application device Aia2 is the ink application device Aia shown in FIG.
The head rotation mechanism 49 for rotating the nozzle head main body 39 is further provided on the upper part of the nozzle head main body 39 (FIG. 4) of the first ink discharge device Aic. Therefore, for simplicity, FIG. 9 shows the nozzle head main body 39,
Only the header 40, the head rotating mechanism 49, and the partition 17 on the rear glass substrate 15 are shown. And in FIG.
Head rotating mechanism 49 and nozzle head main body 3 shown in FIG.
9 shows a state when viewed from above.

In this embodiment, as shown in FIG.
The pitch P of the partition wall 17 is from P1 to P2 (P1> P2 in this example, but may be P1 <P2).
When the ink discharge device Aic moves to the area where the change is made, the head can be rotated by θ by the head rotating mechanism 49 as shown in the figure, and the center position of the nozzle 21 can be positioned at the center between the partition walls at the pitch P2. This nozzle position adjustment operation is performed by the ink application device Ai according to the first embodiment.
Based on data obtained by the partition wall detection method used in a2.

Since the partition wall pitch P may be larger or smaller than the designed value, the distance Dn between nozzles is set to be larger than the designed value by a predetermined amount. By adjusting the rotation angle (θ) of the head rotation mechanism 49, it is also effective to design the nozzle head so as to cope with the fluctuation of the partition wall pitch P.

(Third Embodiment) In the present embodiment, control of the filling amount of the phosphor ink 20 when the partition wall pitch changes as in the second embodiment will be described. When the discharge amount from the nozzle and the X-axis feed (movement amount) per unit time are kept constant, the filling amount of the phosphor 20 is relatively short in a region where the pitch of the partition walls 17 is larger than the predetermined pitch P. As a result, phosphor application to the partition wall surface and the back glass substrate 15 becomes insufficient. On the other hand, in a region where the pitch of the partition walls 17 is smaller than the predetermined pitch P, the relative filling amount of the phosphor 20 becomes excessively large, and the phosphor ink 20 is mixed into the adjacent partition walls 17 to cause a problem such as color mixing. Sometimes.

Therefore, in this embodiment, the position P of the partition wall 17 is detected by the partition wall detecting device 46 in the same manner as in the first embodiment.
p and the distance Lp between the partition walls 17 are detected, and the distance L between the partition walls is detected.
The discharge pressure of the phosphor ink 20 is controlled by adjusting the pressurizing pressure of the pressurizer 23 in accordance with p. Alternatively, the fluorescent ink 2 is controlled by variably controlling the X-axis feed speed in the longitudinal direction of the partition wall.
It is possible to adjust the relative discharge amount of 0.

In the first embodiment, the partition information including the position Pp of the partition and the distance Lp between the partitions 17 is detected at the time of applying the phosphor. It is more practical to perform the operations according to the first to third embodiments based on the information.

In the present invention, an example has been described in which a plurality of nozzles 21 are provided in the nozzle head (39). However, if necessary, the number of nozzles 21 provided in the nozzle head may be single or more. May be. Needless to say, a plurality of these nozzles 21 may be positioned in the substrate and applied in parallel.

As described above, the plasma display panel using the method for forming a phosphor layer according to the present invention is an unprecedented excellent method capable of forming a phosphor layer with high accuracy, stability, and low cost. This is a method that can be applied to wide-range pitches of specifications to plasma display panels of fine pitches such as HDTV.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a plasma display panel to which a phosphor ink is applied by a phosphor ink applying apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a phosphor ink ejection device according to an embodiment of the present invention.

FIG. 3 is a perspective view schematically showing a phosphor ink application device according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a relationship between a phosphor ink application nozzle and a partition in the phosphor ink application device according to the embodiment of the present invention.

FIG. 5 is an explanatory view showing an example of a schematic shape of an actual partition.

FIG. 6 is an explanatory view showing a schematic shape of a partition wall different from the shape shown in FIG. 5;

FIG. 7 is a perspective view schematically showing a coating apparatus according to the first embodiment of the present invention.

FIG. 8 is a plan view schematically showing an application nozzle with a head rotating mechanism of an application apparatus according to a second embodiment of the present invention.

FIG. 9 is a front view schematically showing a coating nozzle with a head rotating mechanism of a coating apparatus according to a second embodiment of the present invention.

FIG. 10 is a cross-sectional view of a plasma display panel to which phosphor ink has been applied by a conventional phosphor ink applying apparatus.

[Explanation of symbols]

 PDP Plasma display panel FP Front panel BP Back panel Fc Continuous flow Aic Ink ejection device Aia, Aia1, Aia2 Ink applicator 11, 200 Front glass substrate 12, 201 Display electrode 13 Dielectric glass layer 14, 203 Dielectric protection layer 15, 205 Back glass substrate 16, 206 Address electrode 17, 207 Partition wall 18, 208 Phosphor layer 19, 209 Discharge chamber 20 Phosphor ink 21 Nozzle 22 Server 23 Pressurizer 28 Main body base 30 Rail 33 Arm 36, 36r Controller 37, 38 Cable 39 Nozzle head main body 40 Header 46 Partition wall detecting device 49 Head rotating mechanism

──────────────────────────────────────────────────の Continuing on the front page (72) Kinzo Nonomura, Inventor 1006 Odakadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Daido Komyoji 1006, Odori Kadoma, Kadoma, Osaka Pref. (72) Inventor Naoko Matsuda 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Masaki Aoki 1006, Ojidoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kanako Miyashita 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-10-27543 (JP, A) JP-A 10-223138 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 9/227

Claims (12)

(57) [Claims] A plurality of partition walls are formed adjacent to each other at a predetermined pitch.
Partitioned by two adjacent partitions on the formed glass substrate
Each space provided has a plurality of nozzles provided in the nozzle head.
From the tip of the nozzle a phosphor ink applying device for ejecting phosphor ink, the tip of the nozzle front while keeping the Kiga glass substrate and a predetermined relative position, then the partition wall to the fluorescent substance ink is applied generally a driving means for driving the nozzle head so as to move to the center, the partition wall and the respective positions and the partition detecting means for detecting the adjacent pitch, the detected position and the detected neighboring pitch of the partition walls between based on the bets, the as tips of the plurality of nozzles are moved along the partition wall, a drive control means for controlling the positioning of a plurality of the of the nozzle tip of the drive means to follow the shape of the partition wall And, depending on the shape of the partition wall, fireflies from the plurality of nozzles.
Phosphor ink ejection amount control to control the ejection amount of optical ink
Means for applying a phosphor ink to a display panel . 2. The method according to claim 1 , wherein said partition wall detecting means is provided on said glass substrate.
The position of the entire formed partition and the adjacent pitch are
And wherein the first it is discovered before key application, claim 1
5. The phosphor ink applying device for a display panel according to claim 1 . 3. The partition wall is formed in a stripe shape.
Characterized in that there display of claim 1
Panel phosphor ink coating device. 4. The plurality of nozzles are phosphors of the same color.
Plurality of ejecting ink, characterized in that it is driven integrally, phosphor ink applying device of the display panel according to claim 3. 5. The plurality of nozzles are arranged at a predetermined pitch.
A nozzle head and a partition wall provided on the nozzle head;
Rotate the nozzle head in the plane with the same gap between
A nozzle head rotating unit for causing the drive control unit to detect a center of the nozzle head.
Positioned at the center between the issued partitions, the nozzle head rotating means according to the shape of the partitions
By adjusting the rotation angle of the nozzle head, the nozzle
Characterized in that the position is located at the center between the partition walls ,
A phosphor ink application device for a display panel according to claim 4 . 6. The plurality of nozzles are arranged at a predetermined pitch.
A nozzle head and a partition wall provided on the nozzle head;
Rotate the nozzle head in the plane with the same gap between
A nozzle head rotating unit for causing the nozzle head rotating unit to change the partition wall pitch.
Depending and adjusting the rotation angle of the nozzle head, the phosphor ink applying device of the display panel according to claim 4. 7. A phosphor formed on a glass substrate in which a plurality of partition walls are formed adjacent to each other at a predetermined pitch, from a tip of a plurality of nozzles provided in a nozzle head to each space partitioned by two adjacent partition walls. A phosphor ink applying method for discharging ink, wherein the tip of the nozzle moves to a substantially center between partition walls to which phosphor ink is to be applied next, while maintaining a predetermined relative position with respect to the glass substrate. A driving step of driving the nozzle head; a partition detection step of detecting a position and an adjacent pitch of each of the partition walls; based on the detected positions of the partition walls and the detected adjacent pitches, The nozzle follows the shape of the partition so that the tip of the nozzle moves along the partition.
A drive control step of controlling the plurality of positioning the tip of the nozzle of the heads or others, depending on the shape of the barrier ribs, phosphor ink discharge amount control step of controlling the discharge amount of the phosphor ink from the plurality of nozzles A phosphor ink application method for a display panel, comprising: 8. The method according to claim 8, wherein the partition wall detecting step comprises :
The position of the whole partition formed on the plate and the adjacent pitch
Claim to detect before applying ink
Item 7. How to apply phosphor ink to a display panel according to item 7.
Law. 9. The method according to claim 8, wherein the nozzle is provided for each phosphor ink of the same color.
Characterized in that a plurality of them are integrally driven
Item 8. A method for applying phosphor ink to a display panel according to Item 7 . 10. The plurality of nozzles have a predetermined pitch.
At a distance from the nozzle head.
Turn the nozzle head in the plane with the same gap between the walls.
Rotating the nozzle head, wherein the driving control step includes:
The nozzle head rotating step is positioned at the center between the detected partition walls, and the nozzle head rotating step is adapted to the shape of the partition wall.
Adjust the rotation angle of the nozzle head
The spill position is located at the center between the partition walls.
The method for applying phosphor ink on a display panel according to claim 9. 11. The method according to claim 11, wherein the plurality of nozzles have a predetermined pitch.
Provided on the nozzle head at a distance from the nozzle head.
Turn the nozzle head in the plane with the same gap between the walls.
Rotating the nozzle head, wherein the nozzle head rotating step includes changing the partition wall pitch.
And adjusting the rotation angle of the nozzle head in accordance with a dynamic, <br/> phosphor ink applying method of a display panel according to claim 9. 12. A front glass substrate provided with a first electrode.
A plate, a second electrode, a plurality of partition walls adjacent at a predetermined pitch
And a phosphor layer is formed in each space partitioned by the partition.
Sealed with the rear glass substrate facing
A method for manufacturing a display panel, wherein the phosphor layer is a phosphor according to claim 7.
Characterized by being formed by an ink application method.
A method for manufacturing a plasma display panel.