WO2003092032A1

WO2003092032A1 - Method of manufacturing rear substrate for plasma display panel

Info

Publication number: WO2003092032A1
Application number: PCT/JP2002/004053
Authority: WO
Inventors: Hideo Yoshizawa; Shunji Kuramoto
Original assignee: Yuugenkaisha Omega Techno Modeling
Priority date: 2002-04-23
Filing date: 2002-04-23
Publication date: 2003-11-06
Also published as: JPWO2003092032A1; JP4176711B2; KR20040097384A; AU2002251529A1

Abstract

A method of mass-producing, at a low cost, a rear substrate for plasma display panel having a barrier ribs data electrode and a fluorescent material layer formed at least on a glass substrate, characterized by comprising the steps of rotatingly running a rotary blade along a plurality of barrier ribs formed on the surface of the glass substrate and applying paste adhered onto the outer peripheral part of the rotary blade onto the inside of cells divided by the ribs.

Description

Specification

Manufacturing method of rear substrate for plasma display panel

The present invention relates to a method for manufacturing a back substrate for a plasma display panel, and a back substrate for a plasma display panel manufactured by the method. More specifically, the present invention relates to a paste coating method useful for forming a data electrode and a phosphor layer on a back substrate for a plasma display panel. Conventional technology

In recent years, plasma display panels (PDPs) have been in the limelight as image display devices have been oriented to large screens, high definition, high brightness, and thin depths, and are rapidly spreading. Cost reduction is strongly demanded for plasma display panels.Especially in the production of the back substrate, it is necessary to form data electrodes, barrier ribs, and phosphor layers with high precision, which is achieved at low cost. There is a strong demand for realizable manufacturing technology.

For example, as shown in FIG. 9, in the industrial production of a glass back substrate for an AC type plasma display panel, a data electrode 120 is first formed on a glass substrate 100 by a printing method and a sputtering method. After that, a dielectric layer 130 is formed, a barrier rib 110 is formed thereon, and subsequently, a phosphor layer 140 of three colors is formed.

In the method described above, when forming the data electrode, the barrier rib, and the phosphor layer, the positioning on the substrate must be performed with an accuracy of several tm to several tens of μΐη. For this reason, it is necessary to accurately form data electrodes and barriers using patterns manufactured with high accuracy, and to ensure positioning accuracy in subsequent subsequent processes.

Furthermore, `` Yuga. Is also required. As a means for solving this, use of a glass substrate having a high strain point has been proposed. However, this high strain point glass hinders cost reduction due to its higher cost than soda lime glass.

In any case, in the manufacture of a plasma display panel, forming the data electrodes, the barrier ribs, and the phosphor layers with high precision by the above-described method causes a large cost. Was.

In order to manufacture the rear substrate for plasma display panels at low cost, even if there is some “distortion” in the position and shape of the barrier ribs, the data electrode layer and the phosphor layer must be It must be able to be formed accurately and at the appropriate thickness in the predetermined position between them. This leads to the formation of highly reliable data electrodes and phosphor layers. Disclosure of the invention

Therefore, the present invention solves the above-mentioned problems, and provides a method of manufacturing a rear substrate for a plasma display panel which can be mass-produced at low cost, and a rear substrate for a plasma display panel manufactured by the method.

The feature of the method of manufacturing a rear substrate for a plasma display panel according to the present invention is that, first, a barrier is formed on a glass substrate, and then the shape and dimensions of the barrier formed in accordance with the actually formed barrier are formed. There is a method of applying a paste for forming a data electrode and a phosphor layer.

In other words, even if there is some “distortion” in the shape of the formed barrier, the data electrode rotates the Ag paste at the exact position in the cell delimited by the parallel. This is a method of applying with a pad. Similarly, a phosphor layer forming paste is applied to the side and bottom surfaces of the cell by a rotating blade to form a phosphor layer.

Specifically, it can be realized by rotating the rotating blade with the paste attached along the actually formed barrier _c. In order to further improve the followability of the rotating blade, it is preferable that the rotating blade be fitted with a shaft supporting the rotating blade. Further, a form in which the rotary plate is supported via a rotatable swing mechanism may be used.

Even if “distortion” occurs on the glass substrate due to thermal expansion and contraction, etc., and the linearity of the barrier ribs is poor and the position thereof is slightly shifted, the method according to the present invention provides a rotating blade. Is rotating along the barrier ribs. For this reason, even if "distortion" occurs, the data electrode and the phosphor can be accurately formed at a predetermined position of the cell. As a result, the "distortion" of the glass substrate does not become strict. Good. For this reason, soda lime silica glass, whose use has been avoided because of its low strain point, can be used as a substrate.In other words, the present invention provides at least a barrier layer on a glass substrate. And a method of manufacturing a rear substrate for a plasma display panel on which a data electrode and a phosphor layer are formed, the method comprising: rotating a rotating blade along a plurality of barriers formed on a surface of the glass substrate; A method of manufacturing a rear substrate for a plasma display panel, characterized in that a paste adhered to an outer peripheral portion of a blade is applied to cells separated by the rib. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram illustrating an example of a back substrate for a plasma display panel according to the present invention.

FIG. 2 is an explanatory diagram of a method of forming barrier ribs (variables) by a sand blast method.

FIG. 3A and FIG. 3B are diagrams for explaining a state in which a conductive paste serving as a data electrode is applied by a rotating blade.

FIG. 4 is a diagram schematically illustrating a mechanism for supplying and attaching the paste to the rotating blade. FIG. 5 is a diagram illustrating a state in which a paste is applied by a laminated rotary blade.

FIG. 6 is a diagram schematically illustrating a mechanism suitable for applying a paste for forming a phosphor layer.

FIG. 7 is a diagram illustrating a waffle type variable valve.

FIG. 8 is a diagram illustrating a rotating blade with projections suitable for applying a paste for forming a phosphor layer on a back substrate having a waffle-type variable valve.

FIG. 9 is a diagram illustrating a back substrate for a plasma display panel according to the related art. BEST MODE FOR CARRYING OUT THE INVENTION

(Back substrate structure)

FIG. 1 shows an example of the structure of the back substrate 1 for a plasma display panel according to the present invention. On the glass substrate 10, first, a barrier rib 11 is formed without a dielectric layer. Data electrodes 12 are formed on the bottom surface of the cells separated by the no-live 11. The data electrode 12 is protected by the dielectric layer 13. Further, phosphor layers 14 R, 14 G, and 14 B are formed on the dielectric layer 13 _c (formation of a barrier rib).

The feature of the back substrate for a plasma display panel according to the present invention is that a barrier rib 11 is first formed on a glass substrate 10, and then a data electrode 12, a dielectric layer 13 and a phosphor layer 1 are formed. 4R, 14G, and 14B are formed, and the order is different from that of the widely used technology.

In the present invention, first, the barrier 11 is directly formed on the glass substrate 10. That is, in the prior art, the barrier rib was formed on a dielectric layer formed to protect the data electrode. On the other hand, in the present invention, the no-live 11 is placed on the glass substrate 10 via a dielectric layer. It is formed directly without it. For forming the barrier ribs, any of the well-known screen printing method, sand-plast method, press method, dry film method and photosensitive paste method may be applied.

Hereinafter, a method of forming a barrier using a sandblast method, which is a typical method, will be described. Figure 2 shows the process.

(a) On a glass substrate 10, a low-melting-point glass layer 41 to be a no-live is formed.

(b) Subsequently, a photoresist 42 is applied thereon.

(c) This substrate is covered with a photomask 43 having a predetermined pattern.

(d) A mask pattern 44 for protecting a portion to be a variable is formed by photolithography.

(e) High-hardness fine particles such as silica and alumina collide with the glass substrate to scrape off the cells.

(f) Through the above steps, a glass substrate 10 on which the rear rib 11 is formed is obtained.

In FIG. 2, the arrow (c) indicates a state in which light for sensitizing the resist is irradiated. The arrow in (e) shows the state of collision of high-hardness fine particles.

The following are other methods for forming barrier ribs. The screen printing method is a method of forming glass partition walls by screen printing. In order to obtain a film thickness necessary for a barrier rib, over-printing is performed more than ten times.

The press method is a method in which a metal mold with irregularities corresponding to a no-live is pressed against the glass space at a high pressure to form a barrier rib.

The dry film method is a method of forming a barrier rib by embedding and firing a glass paste in a gap portion of a patterned thick film dry film.

In the photosensitive paste method, the partition walls are made of photosensitive resin containing glass powder. It is a method of forming.

In each of the methods described above, the barrier lip 11 is separately formed on the glass substrate 10. In addition, the above-described sand-blast method is directly applied to the surface of the glass substrate, and the glass substrate and the barrier rib are formed by partially shaving the surface of the glass substrate to form a barrier rib. It goes without saying that the manufacturing method of the present invention can be applied to an integrated substrate.

(Formation of data electrode)

Cells are separated by barrier ribs arranged at intervals of several hundred μm. It is important to form a data electrode with a predetermined width accurately and reliably at a specific location on the bottom surface of the cell.

In the prior art, this was not a particularly difficult step since the data electrodes only had to be formed on the surface of the flat glass substrate. However, in the present invention, cells separated by a barrier rib are already formed on the surface of the glass substrate. That is, in the present invention, the data electrode is formed on the bottom surface of the concave portion of the glass substrate.

Therefore, if the conventional screen printing / sputtering method is applied, formation of the data electrode involves considerable difficulty. The width of the data electrode to be formed is as thin as several tens x m. In addition, data electrodes must be accurately formed only on the bottom surface of the cells separated by the barriers.

In particular, in the screen printing method, it is inevitable that the paste adheres to the side of the cell. Considering the application of the sputtering method, it is difficult to form accurate data electrodes even with a mask pattern because the bottom of the cell is concave due to the presence of the barrier rib. As for the shape of the formed variable, there are a linear shape called a strip rib and a waveform shape.

Therefore, in the present invention, the data electrodes are formed by the method described below. Note that here, a glass foil containing fine metal particles is used. A data paste is formed by coating and baking a conductive paste of lit (eg, silver paste).

As shown in Fig. 3A, a fixed amount of conductive paste 31 is adhered to the outer periphery of a thin disk-shaped rotating blade 20 and a variable valve 11 is rotated while rotating the rotating blade. Then, the adhered paste is applied to a predetermined position on the surface of the glass substrate 10.

The disk-shaped rotary plate 20 is preferably a disk made of, for example, a cemented carbide and having a diameter of 10 to 5 Omm and a thickness of about 1 mm. The thickness of the tip of the rotating blade must be smaller than the internal method of the cell. Also, it is preferable that the tip of the rotating blade be tapered, since the rotating blade can be easily guided between the variable ribs. When the tip of the rotating blade is sharpened like a blade, it is suitable for forming a thin data electrode. Rotating blades are preferred because they do not require a complicated configuration, due to friction with the substrate when the blade travels forward. The rotary blade may be driven using an external drive source. In this case, coating can be performed without making the peripheral speed of the rotating blade coincide with the running speed.

It is preferable that the rotating plate is run while positioning on the substrate surface by the NC control of the X axis and the Y axis. In addition, it is good to move up and down in the Z-axis direction by NC control. The fitting between the rotating plate 20 and the shaft 21 that supports it is provided with “play” so that it can easily follow the shape of the actually formed variable valve 11. . FIG. 3B shows a state where the rotation blade 20 moves as if to swing the head by providing the “play”.

This "play" is one of the points in the present invention, and it is possible to make the rotary blade follow the variable even if the shape of the variable is slightly distorted. . In other words, the rotary blade generated in the previous process is not perfectly straight, but the rotary blade travels along the groove of the cell with the formed barrier as a guide. Can be done. The preformed barrier rib is formed by forming a non-lip material mainly composed of glass flicker into a predetermined shape on a glass substrate and firing it. At this time, the glass substrate is heated. At this time, it is assumed that the glass substrate expands and contracts due to the heat, and the dimensions in the plane direction are changed and the glass substrate is distorted.

Even in such a case, according to the present invention, the paste for forming the data electrode can be accurately applied to the cell bottom surface following the formed barrier rib. Here, the term “distortion of the substrate” means an order of several tens of PPM to several hundred PPM.

For this reason, the rear substrate does not necessarily need to be formed of a glass substrate having a high strain point, and an inexpensive glass substrate having a soda lime silicon composition can be used as the rear substrate for a plasma display panel. Next, the paste coating device 2 will be described in detail. As shown in FIG. 4, the paste application device 2 includes a rotary plate 20 and a paste supply device 22. The paste supply device 22 includes a paste supply roller 23, a paste amount adjustment roller 24, and a driving device (not shown).

A paste 3 having a constant viscosity is applied to the paste supply roller 23 with a constant thickness. The paste supply roller 23 rotates at a peripheral speed substantially equal to the peripheral speed of the rotary blade 20. The rotating blade 20 and the paste supply roller 23 come into contact with each other, and a fixed amount of the paste 3 adheres to the outer periphery of the rotating blade. When the rotating blade is stopped, the paste supply device and rotating blade are separated, and the supply of the paste is stopped.

The paste amount adjusting roller 24 rotates at the same speed as the paste supplying roller 23. By adjusting the axial distance between these two rollers, the amount of paste applied to the surface of the paste supply roller 23 can be adjusted.

As described above, the paste application device 2 having the rotating blade is A parallel drive formed on the glass substrate 10 is caused to travel in the longitudinal direction, and for example, a paste 31 for forming data electrodes is applied to the bottom surface of the cell. In order to apply the paste to the bottom surface of another cell, the paste application device is sequentially moved in a direction perpendicular to the length direction of the glass substrate barrier rib. In this way, the paste for forming the data electrode can be applied to a predetermined position on the bottom of all cells.

In order to apply paste to many parallel grooves at the same time, as shown in Fig. 5, it is preferable to use a laminated rotating blade 25 in which a plurality of rotating blades 20 are stacked, thereby increasing work efficiency. New At this time, the interval between the rotary blades 20... ′ In the stacked rotary blade 25 may be matched to the cell pitch of the plasma display. Alternatively, if the interval between the rotating blades cannot be matched to the cell pitch due to the thickness of the rotating blades, it is recommended that the spacing be set to a multiple of the cell pitch and the coating be performed while shifting as appropriate.

Even if the glass substrate expands and contracts due to the heat during firing, causing “distortion”, the absolute accuracy of the distance between the barrier ribs is small and close to the distance between nearby barrier ribs. Large between Bali Alives. For this reason, if a large number of rotating blades are stacked, the positional accuracy deteriorates.Therefore, it is preferable to stack several rotating blades and apply a paste by lining up some of them so that work efficiency increases. New

As described above, the paste coating method according to the present invention has been described using an example in which the data electrode is formed between the barrier ribs. However, this paste coating method is also applicable to a substrate having no barrier rib. It goes without saying that you can do it. Further, in the present invention, the application of the paste by the rotating blade may be understood as transferring the paste attached to the outer peripheral portion of the rotating blade to a predetermined position on the substrate surface.

According to the above-described method, the conductive paste can be stably applied to a predetermined width in a required amount, so that the data electrode can be formed with high reliability. Also, compared with the screen printing method, the conductive base in the process There is little loss of the paste and there is almost no need to collect the paste. For this reason, it is preferable because expensive paste materials can be efficiently used.

(Formation of dielectric layer)

Subsequently, a dielectric layer 13 for protecting the data electrode is formed. This dielectric layer may cover and protect the data electrodes 12. For this reason, its forming accuracy is not required much. Therefore, a ceramic paste for forming a dielectric layer by firing is placed on the glass substrate 10 on which the ribs 11 and the data electrodes 12 are formed, for example, by a screen printing method or the like. It is good to apply by diving method.

(Formation of phosphor layer)

In the rear substrate for a plasma display panel according to the present invention, a phosphor layer 14 is formed on a glass substrate 10 after forming a non-live 11, a data electrode 12, and a dielectric layer 13. I have. The phosphor layer is formed by applying three types of phosphor layer forming pastes of red 14 R, green 14 G, and blue 14 B between the barrier ribs 11 in order. In order to improve the luminous efficiency, it is desirable to apply the phosphor not only on the bottom surface of the cell formed of the barrier ribs but also on both sides. In addition, a control of the thickness (amount of application) of the paste to be applied is also required.

When the barrier rib is a strip rib, the phosphor layer can be formed according to the above-described method for forming the data electrode. Since it is necessary to apply the phosphor layer forming paste also to the side surface of the cell, the phosphor layer forming paste should be applied not only to the tip of the rotating blade but also to the side surface. I just need. If necessary, the viscosity of the paste for forming the phosphor layer may be adjusted.

FIG. 6 shows an example of a paste supply device suitable for applying a paste for forming a phosphor layer. The paste supply roller 23 is provided with a groove 231, which serves as a paste reservoir, and the phosphor layer paste 32 is stored therein. Figure 6 shows a flat rotating tip 201 with a flat tip. This shows a state in which the phosphor layer forming paste 32 adheres to the side surface and is applied to the dielectric layer 13 and the side surface of the cell formed on the glass substrate 10. .

Further, for example, when the nouribe is a waffle-type barrier rib 111 as shown in FIG. 7, the phosphor layer cannot be formed by the above-described method. Therefore, as shown in FIG. 8, it is preferable to use a gear-shaped projection-equipped rotary blade 202 provided with equally spaced projections 203 at its tip. The shape of the protrusion is preferably adapted to the shape of the cell formed by the waffle type rib.

A fixed amount of paste is automatically applied to the projection by the paste supply device. When the rotating plate rotates, the protrusions are engaged with the cells formed by the self-supporting ribs, and the paste is applied to the bottom and side surfaces of the cells.

At this time, it is preferable that the pressure at which the protrusion comes into contact with the cell bottom is always constant. In this way, even if the glass substrate has some warpage or undulation, the paste application will not be affected. It is also possible to increase the working efficiency by laminating a number of rotating blades with projections.

When the red (R), green (G), and blue (B) pastes are applied and fired in this way, a phosphor layer is formed.

As described above, a rear substrate for a plasma display panel can be obtained. In addition, the front glass substrate on which the bus electrodes are formed and the rear substrate are assembled and sealed, and further evacuated and sealed with discharge gas. If a peripheral circuit is mounted on this, a plasma display panel can be obtained.

In the above, the method of applying the paste for the data electrode and the paste for the phosphor between the parallels of the rear substrate for the plasma display panel has been disclosed.

However, this method is not limited to this, and can be grasped as the following invention. In other words, this method is capable of applying a precise and appropriate amount of paste to a predetermined position in a large number of concave portions formed in a periodic pattern on the substrate surface. It is also a method that can apply paste to specific parts on a flat substrate. Industrial applicability

As described in detail above, the back substrate for a plasma display panel according to the manufacturing method of the present invention does not necessarily require the glass substrate to be made of a glass composition having a high distortion point, and is used for building and vehicles. An inexpensive soda-lime-silica glass substrate mass-produced in Japan can be used as the back substrate for plasma display panels.

Further, according to the manufacturing method of the present invention, a data electrode and a phosphor layer can be accurately formed at predetermined positions between barrier ribs on a rear substrate for a plasma display panel.

Moreover, according to the present invention, the manufacturing cost of the rear substrate can be reduced for the following reasons.

1. Inexpensive glass substrates can be used.

2. Data electrodes and phosphor layers can be formed with high reliability.

3. Since expensive paste materials can be used efficiently, data electrodes and phosphor layers can be formed at low cost. .

The paste application technique in the present invention is not limited to the back substrate for a plasma display panel, but can be applied to a panel having a similar structure.

Claims

The scope of the claims

1. A method for manufacturing a rear substrate for a plasma display panel, comprising at least a glass substrate, and a variable electrode, a data electrode, and a phosphor layer,

A rotating blade is rotated along a plurality of barriers formed on the surface of the glass substrate, and a paste adhered to an outer peripheral portion of the rotating blade is applied to cells separated by the rib. A method for manufacturing a rear substrate for a plasma display panel, comprising:

2. The method according to claim 1, wherein the paste is a conductive paste, and the paste is applied to a bottom surface of the cell to form a data electrode.

3. The plasma display panel back substrate according to claim 1, wherein the paste is a phosphor layer forming paste, and the paste is applied to side and bottom surfaces of the cells to form a phosphor layer. Production method.

4. The method for manufacturing a rear substrate for a plasma display panel according to claim 1, wherein the rotating blade is fitted with a shaft supporting the rotating blade.

5. The method for manufacturing a rear substrate for a plasma display panel according to claim 1, wherein the rotating blade is a disk-shaped blade.

6. The method for manufacturing a back substrate for a plasma display panel according to claim 1, wherein the rotating blade is formed by stacking a plurality of disk-shaped blades,

7. The manufacturing of the back substrate for a plasma display panel according to claim 5, wherein the rotating plate has a tapered end. Method

8. The rear substrate structure for a plasma display panel according to claim 1, wherein the rotary plate has a plurality of projections regularly on an outer peripheral portion thereof, and the paste is intermittently applied on the substrate. Manufacturing method.

9. The method for manufacturing a rear substrate for a plasma display panel according to claim 8, wherein the rotating blade has the protrusions provided at equal intervals.

10. The method for manufacturing a rear substrate for a plasma display panel according to claim 8, wherein the rotating blade is formed by stacking a plurality of blades having the protrusion.

11. A rear substrate for a plasma display panel manufactured by the method for manufacturing a rear substrate for a plasma display panel according to any one of claims 1 to 10.