JP2003317616A - Manufacturing method for plasma display panel and phosphor layer forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to form a phosphor layer accurately and evenly with an excellent productivity in the case of one with a fine discharge cell structure. <P>SOLUTION: A phosphor ink 14 is discharged between partition walls 9 from a nozzle 19, and at the same time, a phosphor 14a just after being applied between the partition walls 9 is baked by a phosphor baking means 20. With this, drying after application of the phosphor ink 14 is dispensed with, so that it becomes possible to form a phosphor layer 10 between the partition walls 9 with accuracy, evenness and excellent productivity. <P>COPYRIGHT: (C)2004,JPO

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 plasma display panel known as a large-screen, thin, lightweight display device and a phosphor layer forming apparatus.

[0002]

2. Description of the Related Art FIG. 2 is a sectional perspective view of a conventional general plasma display panel (hereinafter referred to as PDP). The substrate 1 is a transparent and insulative substrate such as glass, and a plurality of display electrodes 4 covered with a dielectric layer 2 and a protective film 3 made of a MgO vapor-deposited film are provided on the substrate 1. . The display electrode 4 is a pair of the scan electrode 5a and the sustain electrode 5b. The substrate 6 is, for example, an insulating substrate such as glass, and a plurality of data electrodes 8 covered with the insulator layer 7 are attached to the substrate 6, and the data electrodes 8 on the insulator layer 7 are interposed between the data electrodes 8. A stripe-shaped partition wall 9 is provided in parallel with the data electrode 8. Further, a phosphor layer 10 is provided on the surface of the insulator layer 7 and the side surface of the partition wall 9. The substrate 1 and the substrate 6 are the scanning electrodes 5a.
The sustain electrodes 5b and the data electrodes 8 are arranged so as to be orthogonal to each other with the discharge space 11 interposed therebetween. At least one kind of rare gas selected from helium, neon, argon, and xenon is enclosed in the discharge space 11 as a discharge gas, sandwiched between two adjacent barrier ribs 9, and the data electrode 8 and the scan electrode 5a and the sustain electrode are maintained. The discharge space 11 at the intersection with the electrode 5b becomes the discharge cell 12.

In recent years, there has been an increasing demand for higher quality displays, and in order to realize this, P
In the DP, it is necessary to miniaturize the discharge cell 12. For example, in the conventional NTSC, the number of discharge cells 12 is 640 ×
480 is about (number), the size of the discharge cell 12 is 40-inch class is 0.43 mm × 1.29 mm, but the area is about 0.55 mm ^2, in the case of full-spec hi-vision television, the number of pixels 1920 x 1125
The size of the discharge cell 12 in the 42-inch class is 0.15 mm × 0.48 mm, and the area is 0.072.
It becomes mm ² .

The discharge cell 12 having a fine size as described above.
As a method of forming the phosphor layer 10 between the partition walls 9 of the above, instead of the conventional screen printing method, for example, a relatively low-viscosity phosphor ink composed of phosphor particles and an organic binder is ejected from the nozzle to the partition wall 9. The ink jet method is used in which the phosphor is applied between the partition walls 9 by the above process and then baked.

[0005]

In the ink jet method as described above, since the phosphor ink has a low viscosity, it is usually necessary to convey the red, green, and blue phosphor inks once each time the conveyor ink is applied. It is necessary to dry the phosphor ink in a furnace or the like. Then, after applying and drying all the phosphor inks of red, green, and blue, baking is performed in a conveyor furnace or the like, whereby the formation of the phosphor layer is completed. That is, three drying steps and one baking step are required to form the phosphor layer, which is a factor that hinders the improvement in productivity in the phosphor layer forming step.

In view of the above problems, it is an object of the present invention to enable a phosphor layer to be formed accurately and uniformly and with high productivity even in the case of a fine discharge cell structure.

[0007]

In order to achieve the above object, a method of manufacturing a plasma display panel according to the present invention comprises a plurality of barrier ribs arranged in parallel with each other and data electrodes arranged between the barrier ribs. On the substrate, a phosphor coating step of coating the phosphor between the partition walls by ejecting a phosphor ink from the nozzles to the partition walls, and a phosphor firing step of baking the phosphor immediately after being coated between the partition walls. I have.

In order to achieve the above object, the phosphor layer forming apparatus for a plasma display panel according to the present invention comprises:
It has a phosphor coating means for discharging and coating the phosphor ink from the nozzles between the partition walls, and a phosphor firing means for firing the phosphor immediately after being coated between the partition walls.

As described above, even in the case of a fine discharge cell structure, the phosphor layer can be formed accurately and uniformly and with high productivity.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Note that P in the following description
The structure of the DP is the same as that shown in FIG. 2, and the same components are given the same numbers.

FIG. 1 is a sectional view of a schematic structure of a phosphor layer forming apparatus for a PDP according to the present embodiment, and also a schematic sectional view of a substrate portion of a PDP on which a phosphor is formed. It is also shown.

The phosphor applying means 13 is for applying the phosphor ink 14 by ejecting it from the nozzle 19 between the partition walls 9 and applying it.
A server 15 for storing the phosphor ink 14 and a pressure pump 17 for pressurizing the phosphor ink 14 and supplying it to the header 16 are provided. Ink chamber 18 and nozzle 1
9 is provided in the header 16.

A phosphor burning means 20 is provided on the rear side of the header 16 in the scanning direction. The phosphor firing means 20 is, for example, a laser irradiation device or an infrared light irradiation device, which forms the phosphor layer 10 by non-contact heating and baking the phosphor ink 14a immediately after being applied. .

In the phosphor ink 14, phosphor particles of RGB colors, binders, solvent components, etc. have appropriate viscosities, for example, 2 to
It was prepared to be about 30,000 centipoise.

As the phosphor particles of each color, those generally used in the phosphor layer of the PDP are used. Specific examples include: blue phosphor: BaMgAl ₁₀ O ₁₇ : Eu ²⁺ green phosphor: BaAl ₁₂ O ₁₉ : Mn or Zn ₂ S
iO ₄ : Mn red phosphor: (Y _x Gd _1-x ) BO ₃ : Eu ³⁺ or YBO ₃ : Eu ³⁺ can be mentioned.

Next, a method of forming the phosphor layer of the PDP using the PDP phosphor layer forming apparatus shown in FIG. 1 will be described. First, the nozzle 19 is aligned with the partition wall 9 which is the target area for ejecting the phosphor ink. And the substrate 6
Alternatively, the phosphor coating means 13 is scanned, and the phosphor ink 14 is pressed by the pressurizing pump 17 so that the phosphor ink 14 is ejected from the nozzle 19 toward the space between the partition walls 9 to apply the phosphor between the partition walls 9. To do. Here, since the phosphor burning means 20 is provided on the rear side with respect to the scanning direction of the header 16, the phosphor 14 immediately after being applied is applied.
The a is heated and fired by the phosphor firing means 20, and as a result, the phosphor layer 10 is formed. Then, the series of operations described above is repeated for each color of red, blue, and green to complete the formation of the phosphor layer 10.

In the above, even if the phosphor ink 14 is a relatively low-viscosity phosphor ink suitable for being applied between the fine partition walls 9, immediately after applying the phosphor applied between the partition walls 9. Since the baking is performed, there is no need for a conventional drying step between application and baking. Therefore,
Even in the case of a fine discharge cell structure, the phosphor layer 10 can be formed accurately and uniformly and with good productivity.

Further, by using a phosphor layer forming apparatus in which a plurality of the phosphor layer forming apparatuses described above are put together, it is possible to collectively apply and fire the phosphor ink by one scanning. It is possible to further improve the productivity in the phosphor layer forming step.

Here, in order to prevent clogging of the nozzles 19 and precipitation of the phosphor particles, the average particle size of the phosphor particles used in the phosphor ink is preferably 5 μm or less.
In order for the phosphor to obtain good luminous efficiency,
The average particle size of the phosphor is preferably 0.5 μm or more.

In the case of such an average particle size of the phosphor, the diameter of the nozzle 19 is preferably 45 μm or more in order to prevent the clogging due to the phosphor particles, but of course it is more than the interval between the partition walls 9. Since it needs to be small,
It is preferably set in the range of 45 to 150 μm.

The pressure applied by the pressure pump 17 is preferably adjusted so that the flow of the phosphor ink 14 ejected from the nozzle 19 becomes a continuous flow. This is phosphor ink 1
This is because the shape and thickness of the phosphor layer 10 are more accurately and uniform than in the case where 4 is applied as droplets and applied intermittently.

In the above description, the structure in which the data electrode 8 is covered with the insulator layer 7 has been described as an example, but the present invention is not limited to this, and the data electrode 8 without the insulator layer 7 is provided. Even if the structure is exposed, the effect of the present invention can be obtained similarly.

Further, although the partition wall 9 has a striped shape as an example, the partition wall is not limited to this, and if the phosphor layer 10 is formed in a striped shape along the data electrode 8, the partition wall may be formed. The effect of the present invention can be obtained similarly in any form such as a form in which the stripe-shaped partition wall 9 and the crossing partition wall 9 are combined.

[0024]

As described above, according to the present invention, even when the structure of the discharge cell in the plasma display panel is minute, the phosphor layer can be formed accurately and uniformly and with high productivity.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an apparatus for forming a phosphor layer of a plasma display panel according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a general plasma display panel.

[Explanation of symbols]

6 substrate 8 data electrodes 9 partitions 10 Phosphor layer 13 Phosphor coating means 14 Phosphor ink 19 nozzles 20 phosphor firing means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Hirose             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Utaro Miyakawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C028 FF01 FF16                 5C040 FA01 GG09 JA13 JA21 MA02                       MA23 MA26 MA30

Claims (6)

[Claims] 1. A phosphor ink is ejected from a nozzle to a space between the partition walls by ejecting phosphor ink from a nozzle onto a substrate having a plurality of partition walls arranged in parallel with each other and data electrodes disposed between the partition walls. A method of manufacturing a plasma display panel, comprising: a phosphor coating step of coating and a phosphor firing step of firing a phosphor immediately after being applied between the partition walls. 2. The method for manufacturing a plasma display panel according to claim 1, wherein the phosphor firing step is laser firing. 3. The method of manufacturing a plasma display panel according to claim 1, wherein the phosphor firing step is firing by irradiation with infrared light. 4. Fluorescence of a plasma display panel having phosphor coating means for discharging and coating phosphor ink from nozzles to between partition walls, and phosphor burning means for baking the phosphor immediately after being coated between the partition walls. Body layer forming device. 5. The phosphor layer forming apparatus for a plasma display panel according to claim 4, wherein the phosphor firing means is a laser firing apparatus. 6. The phosphor layer forming apparatus for a plasma display panel according to claim 4, wherein the phosphor burning means is an infrared light irradiation device.