JP2003297241A - Manufacturing method of plasma display panel and fluolescent material layer forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a fluolescent material layer with precision and uniformity, even in case of a minute electric discharge cell structure. <P>SOLUTION: A fluolescent material ink 14 is ejected from nozzles 19 between barrier ribs 9, and coating is carried out with the fluolescent material ink 14 while applying a voltage to the data electrode 8 between barrier ribs 9. By this, even if an electrostatic charge is created between the ribs when the fluolescent material ink 14 is discharged from the nozzles 19, it becomes possible to form the fluolescent material layer between the barrier ribs 9 precisely and uniformly. <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. 3 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 rare gas selected from helium, neon, argon, and xenon is enclosed in the discharge space 11 as a discharge gas, and the discharge space 11 is sandwiched between two adjacent barrier ribs 9, and the data electrode 8, the scan electrode 5a, and the sustain electrode 5a. 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 .

[0004]

Conventionally, as a method of forming the phosphor layer 10, for example, a method of filling a phosphor paste between the partition walls 9 by a screen printing method and firing it has been used. If is fine as described above,
It is difficult to apply such a forming method. That is, when the cell size of the discharge cell 12 is fine and the interval between the barrier ribs 9 is narrow,
This is because the phosphor ink used in the screen printing method has a high viscosity, so that it becomes difficult to pour the phosphor ink between the partition walls 9 accurately and at high speed.

As another forming method, there is a method of applying phosphor ink consisting of phosphor particles and an organic binder while scanning the phosphor ink while ejecting it from the nozzle so as to apply it between the partition walls 9. According to this method, the phosphor ink can be poured even when the space between the partition walls 9 is narrow. However, when the phosphor ink is ejected from the nozzle, it may be charged by static electricity generated. In such a case, Causes an error in the ejection direction of the ejected ink, and as a result, problems such as a defective shape of the phosphor layer 10, riding on the top of the partition wall 9, and color mixing have been observed.

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 even in the case of a fine discharge cell structure.

[0007]

In order to achieve the above object, the present invention provides a phosphor ink for a substrate having a plurality of barrier ribs arranged in parallel with each other and a data electrode disposed between the barrier ribs. And a step of forming a phosphor layer between the barrier ribs by applying a voltage to the data electrode between the barrier ribs.
As a result, even in the case of a fine discharge cell structure, the phosphor layer can be accurately and uniformly formed.

[0008]

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. 3, 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 this embodiment, and also a sectional view of a schematic structure of a substrate portion of a PDP on which a phosphor is formed. It is also shown.

The application means 13 applies the phosphor ink 14 from the nozzle 19 to the space between the partition walls 9 to apply it. The server 15 for storing the phosphor ink 14 and the phosphor ink 14 are used.
Pressurizing pump 17 for pressurizing and supplying to header 16
And with. The header 16 has an ink chamber 18
And a nozzle 19 are provided.

The power source 20 is for selectively applying a voltage to the data electrodes 8 formed between the partitions 9 on the substrate 6 of the PDP.

The phosphor ink 14 contains phosphor particles of RGB colors, a binder, a solvent component, etc., and has an appropriate viscosity, for example, 2 to 2.
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 a phosphor layer of PDP using the phosphor layer forming apparatus of PDP shown in FIG. 1 will be described with reference to FIG. As shown in FIG. 2A, the alignment is performed so that the nozzles 19 are located between the partition walls 9 which are the target regions for ejecting the phosphor ink. Figure 2 (b) in that state
As shown in, the power source 20 selectively applies a voltage to the data electrodes 8 between the partition walls 9. And FIG. 2 (c)
As shown in FIG. 1, the phosphor ink 14 is pressurized by the pressurizing pump 17, and the phosphor ink 1 is directed from the nozzle 19 to the space between the partition walls 9.
4 is discharged. Then, the series of operations as described above,
The phosphor layer 10 is formed by repeating the process for each color of red, blue, and green, followed by drying and then firing.

Here, in the method of forming the phosphor layer 10 described above, the data electrodes 8 to which a voltage is applied are present between the partition walls 9 which are the target regions for forming the phosphor layer 10. In order to do this, phosphor ink 14 charged with static electricity
Is ejected to the data electrodes 8 with good directionality, and it becomes possible to accurately apply the phosphor ink between the partition walls 9.

As a result, the phosphor layer can be accurately formed between the partition walls 9 without causing problems such as a defective shape of the phosphor layer 10, riding on the tops of the partition walls 9, and color mixing. .

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, it is preferable that the diameter of the nozzle 19 is 45 μm or more in order to prevent clogging by the phosphor particles, but it is better than the interval between the partition walls 9. Of course, because it needs to be small,
It is preferably set in the range of 45 to 150 μm.

The pressure applied by the pressurizing 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. However, the present invention is not limited to this, and the data electrode 8 does not have the insulator layer 7. 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 along the data electrode 8 in a striped shape, 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.

[0022]

As described above, according to the present invention, even when the structure of the discharge cell in the plasma display panel is fine, it is possible to easily and accurately form the phosphor layer uniformly.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a method for forming a phosphor layer of a plasma display panel according to an embodiment of the present invention.

FIG. 3 is a schematic sectional view of a general plasma display panel.

[Explanation of symbols]

6 substrate 8 data electrodes 9 partitions 14 Phosphor ink 19 nozzles 20 power supplies

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01J 11/02 B41J 3/04 101Z (72) Inventor Takashi Hirose 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Incorporated (72) Inventor Utarou Miyagawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 2C056 FA07 FB01 4D075 AC07 CB36 DA06 DB13 DC21 EA07 EA33 EC11 5C028 FF01 5C040 FA01 FA04 GB03 GB14 GG09 JA02 MA24

Claims (5)

[Claims] 1. A phosphor ink is ejected from nozzles between the partition walls to a substrate having a plurality of partition walls arranged in parallel with each other and data electrodes arranged between the partition walls, and a data electrode between the partition walls is formed. A method for manufacturing a plasma display panel, comprising the step of forming a phosphor layer between barrier ribs by applying a voltage. 2. The method for manufacturing a plasma display panel according to claim 1, wherein the voltage applied to the data electrode is a DC voltage having a polarity different from the polarity of charging the phosphor ink. 3. The method for producing a plasma display panel according to claim 1, wherein the discharge of the phosphor ink from the nozzle to the space between the partitions is a continuous flow. 4. A phosphor layer formation of a plasma display panel, comprising: a coating means for discharging a phosphor ink from a nozzle to apply between the partition walls, and a power supply for applying a voltage to a data electrode between the partition walls for applying the phosphor. apparatus. 5. The phosphor layer forming apparatus for a plasma display panel according to claim 4, wherein the power source is a DC power source.