JP3909725B2 - Display panel substrate manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a display panel substrate having fine barrier ribs used for various display panels including a plasma display panel.
[0002]
[Prior art]
The basic structure of a plasma display panel that is also applied to a wall-mounted television or the like is as shown in FIG. 3, for example. That is, the front panel A and the back panel B are overlapped so that the striped electrodes A1 and B1 formed on both panels face each other, and discharge is generated in the striped or grid-shaped partition walls C at the intersections. To emit light.
[0003]
The partition wall C is provided to prevent crosstalk of light and to make the contrast of the screen, and is very fine. For example, in the case of a stripe shape, it is required to be formed over the entire panel with a width of about 30 μm and a height of about 200 μm at intervals of about 100 μm. And inside the partition C of such a fine dimension, fluorescent substance is apply | coated and inert gas, such as Ne and Xe, is enclosed. Therefore, from the viewpoint of obtaining a complex and clear image, naturally, the fine pattern required for the partition wall C is made, and the amount of the phosphor applied is made constant, and it adheres closely to the front panel A to prevent leakage of the inert gas. From a viewpoint or the like, the dimensional accuracy of the partition wall C is required to be high.
[0004]
Conventionally, as a method for forming such partition walls C, a screen printing method or a sand blasting method has been adopted. In the screen printing method, an operation of printing a glass paste on a glass substrate and drying is repeated about 10 times by aligning each time, and a partition wall is formed by so-called overprinting. In the sand blasting method, a glass paste is applied to the front surface of a glass substrate, coated with a photoresist, exposed and developed, and then a portion not covered with a resist pattern is sand blasted to form partition walls.
[0005]
[Problems to be solved by the invention]
In the method of forming the partition wall by the screen printing method, it is difficult to form a fine pattern due to the alignment and the distortion of the screen every time, and this difficulty is a great obstacle especially when the screen is enlarged. The occurrence of such a problem when the screen printing method is applied is one of the reasons that the partition wall raw material liquid is liable to sag.
Also, depending on the method of forming the partition wall by the sandblast method, the problem that the depth tends to be nonuniform can not be solved, and it is difficult to make a fine pattern and enlarge the screen.
Furthermore, in any of the methods, it takes a long time to increase the dimensional accuracy, which is a factor that increases the manufacturing cost.
[0006]
Therefore, the present invention provides a method for producing a display panel substrate suitable for a plasma display panel, which can solve the above-mentioned problems and can precisely transfer a fine pattern of a master mold by a simple method. The purpose is to provide.
[0007]
[Means for Solving the Problems]
The present inventor first paid attention to the occurrence of problems due to the dripping of the partition wall raw material liquid during the formation of the partition walls by the conventional screen printing method, and then does not use the partition wall raw material liquid as it is, but allows the carrier to be impregnated and retained. As a result of finding out that the liquid dripping itself can be eliminated by using it and further researching this desirable carrier, the present invention has been completed.
[0008]
The present invention provides, as means for achieving the above object, impregnated with a partition wall material liquid in the porous sheet, Place the porous sheet impregnated with septa material solution onto forming surface of the mold of the fine pattern, Furthermore, the first step of placing a glass plate thereon and heating while pressing to deform the porous sheet impregnated with the partition wall raw material liquid according to the shape of the fine pattern and curing the partition wall raw material liquid A display panel substrate comprising: a second step of removing a mold; and a third step of firing the remaining glass substrate and porous sheet at a temperature at which the porous sheet can be burned and removed. A manufacturing method is provided.
[0009]
The present invention provides a means for achieving the above object, impregnated with a partition wall material liquid in a porous sheet placed the porous sheet and the partition wall material liquid impregnated on a glass plate, mold thereon The first step of placing the formation surface of the fine pattern on top of each other , and heating while pressing to deform the porous sheet impregnated with the partition wall raw material liquid according to the shape of the fine pattern and curing the partition wall raw material liquid 2. A display panel substrate comprising: a second step; and a third step of removing the mold and firing the remaining glass substrate and porous sheet at a temperature at which the porous sheet can be burned and removed. Provide a method.
[0010]
The present invention also provides a method for producing a display panel substrate according to claim 1 or 2, which is a plasma display panel substrate according to claim 3 as means for achieving the above object.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the manufacturing method of the display panel substrate of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view for explaining the manufacturing method of the present invention, and FIG. 2 is a schematic front view for explaining the manufacturing method of the present invention, and is a schematic front view of a display panel substrate. is there.
[0012]
In the first step, first, the porous sheet 20 impregnated with the partition wall raw material liquid is placed on the surface on which the fine pattern 50 of the mold 6 is formed, and then the glass plate 30 is further stacked on the porous sheet 20. Put. At this time, since the partition wall raw material liquid is impregnated and held in the porous sheet 20, liquid dripping does not occur during the operation, and handling is easy.
[0013]
The molding die 6 is a master die, and the material is not particularly limited as long as the fine pattern 50 can be formed. The fine pattern 50 is used to form a partition wall of a target display panel substrate, and the partition pattern forms a concave-convex inverted image. The fine pattern 50 of the mold 6 has a stripe shape or a lattice shape. For example, the fine pattern 50 is a stripe shape having a width of 60 μm, a depth of 200 μm, and an interval of about 160 μm. . In order to improve the releasability, a plating layer in which submicron fluororesin particles are dispersed is applied to the surface of the mold 6, for example, electroless nickel-PTFE dispersion by Hikifune Co., Ltd. or Osaka Gas Chemical Co., Ltd. Plating can be applied.
[0014]
The porous sheet 20 has a function of assisting the partition raw material liquid impregnated therein to transfer the fine pattern 50 of the mold 6 and finally form the partition. Therefore, in order to perform this transfer satisfactorily, it has pores that can impregnate and hold as much partition wall raw material liquid as necessary, and preferably those pores that are uniformly dispersed. Any material can be used as long as it exists. Further, in order to facilitate the transfer of the fine pattern 50, it is preferable that it is as thin as possible. Examples of the porous sheet 20 include paper, synthetic paper, plastic films and sheets, plastic foam, cloth, and non-woven fabric. As a suitable thing, the nonwoven fabric-like sheet | seat of ultra high molecular weight polyethylene can be used.
[0015]
The partition wall raw material liquid impregnated in the porous sheet 20 is not particularly limited as long as it has permeability and nonflammability to such an extent that it can be impregnated and can be cured to form partition walls. As such partition wall raw material liquid, a product name HEATLES GLASS GS-600 series (Homer Technology Co., Ltd.) forming a silicon-containing polymer, a polysilazane such as perhydropolysilazane, for example, a trade name Tonen Polysilazane (Tonen Corporation) The trade name is an inorganic binder, such as Red Proof's MR-10 series (Heatken Co., Ltd.) and conventionally used glass pastes. Since this partition wall raw material liquid becomes a partition wall, a dark-colored colorant such as black can be blended as necessary so as to be advantageous in obtaining the contrast of the display panel.
[0016]
As a method of impregnating the porous sheet 20 with the partition wall raw material liquid, a method of immersing the porous sheet in the partition wall raw material liquid, a method of applying the partition wall raw material liquid to the porous sheet, or the like can be applied.
[0017]
The glass plate 30 can be used as the back glass substrate 3 as it is. Moreover, this glass plate 30 supports the porous sheet 20 at the time of manufacture, and improves workability | operativity.
[0018]
Next, in the second step, heating is performed while pressing. By this pressing, the porous sheet 20 is pressed against the fine pattern 50 of the mold 6 and deforms corresponding to the shape of the fine pattern 50. At the same time, since the partition wall raw material liquid impregnated in the porous sheet 20 is cured by heating, the deformation is maintained as it is, and the fine pattern 50 is transferred to the porous sheet 20 while being inverted. At this time, the porous sheet 20 containing the hardened partition wall raw material liquid also adheres to the glass plate 30. Further, in this step, the mold 6 in the next step is more easily detached, so that the curing can be stopped to such an extent that the uneven shape of the fine pattern 50 can be maintained without completing the curing.
[0019]
As the pressing and heating means, for example, as shown in FIG. 1, a heat press machine P including a fixed platen P1 and a movable platen P2 movable in the vertical direction can be used. That is, the mold 6, the porous sheet 20, and the glass plate 30 are placed in this order on the stationary platen P1, and the movable platen P2 is lowered and pressed against the glass substrate and heated while being pressed. At this time, a combination of the mold 6, the porous sheet 20 and the glass plate 30 in advance can be placed on the stationary platen P <b> 1, or the glass plate 30, the porous sheet 20 and the mold 6 are fixed in this order. It can also be placed on the board P1. After the heating is finished, the movable platen P2 is raised this time, and the mold 6, the porous sheet 20, and the glass plate 30 are taken out. In order to ensure a uniform pressing state in this pressing operation, a cushioning material having good thermal conductivity may be sandwiched between the fixed platen P1 and the movable platen P2.
[0020]
This pressing force varies depending on the type and thickness of the porous sheet 20 and the amount and type of impregnation of the partition wall raw material liquid, and is determined in consideration of these factors comprehensively. Further, the heating conditions are determined according to the type and amount of the partition wall raw material liquid impregnated in the porous sheet 20.
[0021]
Next, in the third step, the mold 6 is detached, and the remaining glass plate 30 and porous sheet 20 are fired at a temperature at which the porous sheet 20 can be removed by combustion. By firing in this way, only the organic porous sheet 20 is burned and volatilized and removed. In this way, as shown in FIG. 2, the display panel substrate 10 includes the partition wall 2 having the fine pattern 51 in which the fine pattern 50 of the mold 6 is finely inverted and transferred, and the glass substrate 3 that supports the partition wall 2. Can be obtained.
[0022]
The display panel substrate 10 thus obtained can be used to obtain a target display panel such as a plasma display panel by attaching an address electrode or applying a phosphor according to a conventional method. .
[0023]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these.
[0024]
Example 1
By applying the manufacturing method of the present invention, a plasma display panel substrate having stripe-shaped partition walls as shown in FIG. 3 was manufactured. Hereinafter, a description will be given based on FIGS. 1 and 2.
First, a metal forming die 6 having a fine pattern 50 having a width of 60 μm, a height of 200 μm, and an interval of 160 μm was prepared and placed on a stationary plate P1 of a heat press machine P. Next, on the surface on which the fine pattern 50 of the metal mold 6 is formed, a nonwoven fabric-like sheet of ultrahigh molecular weight polyethylene having a thickness of 150 μm that is a porous sheet 20 is used as a partition wall raw material liquid under the trade name HEATLES GLASS (GS-600- 1; containing isopropyl alcohol as a diluent) was placed. Then, the glass plate 30 used as a board | substrate was set | placed on the application surface. In addition, the said impregnation process was performed by apply | coating HEATLES GLASS to a nonwoven fabric-like sheet | seat.
Next, the movable platen P2 of the heat press machine is lowered and pressed against the glass plate 30, while being heated at about 130 ° C. for about 20 to 30 minutes while applying a pressure of about 15 g / cm ² , the HEATLESS GLASS is Cured.
After the curing was completed, the movable platen P2 was raised and the metal mold 6 was detached to obtain a display panel substrate precursor as shown in FIG. Thereafter, this is put into a heating furnace, held at about 500 ° C. for about 30 minutes, the nonwoven fabric-like sheet is burned and removed, and a display panel substrate 10 having partition walls 2 and a glass substrate 3 as shown in FIG. Got.
When the surface of the display panel substrate 10 is observed with a microscope, the fine pattern 50 of the fine pattern 51 having a width of 60 μm, a height of 200 μm, and an interval of 160 μm is obtained by inverting and transferring the fine pattern 50 of the metal mold 6 as it is. It was confirmed that it was formed.
[0025]
【The invention's effect】
In the production method of the present invention, the porous sheet is impregnated and held with a partition wall raw material liquid that usually tends to sag. For this reason, it is possible not only to completely prevent problems caused by liquid dripping, but also because handling is easy, workability can be significantly improved. Further, since the processing time can be shortened, the manufacturing cost can be reduced.
By applying the manufacturing method of the present invention, fine patterning of the partition walls can be achieved, so that a display panel substrate to be applied to a high quality plasma display panel or the like can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic front view for explaining a production method of the present invention.
FIG. 2 is a schematic front view for explaining the production method of the present invention.
FIG. 3 is a schematic perspective view showing a structural example of a plasma display panel.
[Explanation of symbols]
2 Partition 3 Glass substrate 6 Mold 10 Display panel substrate 20 Porous sheet 30 Glass plate 50 Fine pattern 51 Fine pattern

Claims (3)

Impregnating the partition wall material liquid in the porous sheet, Place the porous sheet impregnated with septa material solution onto forming surface of the mold micropattern, a further first step of placing overlapping glass plates thereon was heated while pressing a second step of Ru curing the barrier rib material solution causes a porous sheet impregnated with septum material liquid is deformed to correspond to the shape of the fine pattern, the mold detached, the remainder A method for producing a substrate for a display panel, comprising a third step of firing the glass substrate and the porous sheet at a temperature at which the porous sheet can be burned and removed. The partition wall material solution is impregnated into the porous sheet, on a glass plate placed the porous sheet and the partition wall material liquid impregnated, a first step of placing overlapping the forming surface of the mold micropattern thereon, pressing Heating, while the porous sheet impregnated with the partition wall raw material liquid is deformed corresponding to the shape of the fine pattern and the partition wall raw material liquid is cured, and the mold is detached, and the remaining glass substrate And a third step of baking the porous sheet at a temperature at which the porous sheet can be burned and removed .   3. The method for manufacturing a display panel substrate according to claim 1, wherein the display panel is a plasma display panel.

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