JPH038292A - Manufacture of organic dispersion type el panel - Google Patents

Abstract

PURPOSE:To improve a yield by providing an insulating layer and a phosphor layer on separate films, laminating them in contact with each other, and unifying a light emitting face. CONSTITUTION:An insulating layer 3 is coated on an aluminum film 4, a phosphor layer 2 is coated on another film 7, and the coated faces are overlapped face to face and pressed. The melting point of the high-dielectric resin of the phosphor layer 2 is made lower than that of the insulating layer 3. Phosphors with a large average grain size dispersed in the phosphor layer 2 flow in the phosphor layer 2 when heat-pressed, and voids at the boundary with the insulating layer 3 where phosphors do not flow relatively are buried and matched. The adherence between the phosphor layer 2 and the insulating layer 3 is improved, the coated face of the phosphor layer 2 is made very smooth if the smooth film 4 is used, and an excellent light emitting face is obtained. The light emitting face is made uniform, and an EL panel can be manufactured with a good yield.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing an organic dispersion type EL panel.

[Conventional technology]

The manufacturing method of a so-called organic dispersion type EL panel, in which a fluorescent layer is formed by dispersing phosphor tO in a high dielectric resin, and an insulating layer is formed by dispersing an inorganic filler in a high dielectric resin, is shown in Figure 3. Back as shown! Trap on aluminum film 4 as pole, insulation 1
3. Conventionally, the phosphor layer 2 has been dot-coated sequentially using a comma coater method, a screen printing method, etc.
Using a paste made by kneading BaTiOs of m, a paste obtained by kneading a phosphor having an average particle size of 40 ttm is further applied to the same high dielectric resin from the soil to obtain fluorescent j2.

[Problem to be solved by the invention]

In the conventional example trap described above, in J5 shown in FIG. 6, P! The coated surface of the edge layer 3 has unevenness due to the inorganic substance, and the surface of the phosphor layer 20 in which phosphors with larger particle sizes are dispersed has significant hing holes and uneven coating thickness of 1 mm. In order to prevent this, the method of increasing the amount of high R1 resin in the phosphor layer and completely burying the phosphor particles has been carried out, but this results in a significant decrease in brightness when used as an EL panel.

That is, conventional organic dispersion type EL panels have many defects in appearance such as uneven light emission and spots, and it has been difficult to produce panels with a uniform light emitting surface with a good overall yield.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a method for manufacturing an organic dispersion type EL panel having a uniform light emitting surface with a high yield.

[Means to solve the problem]

The present invention is a manufacturing method in which an insulating layer and a fluorescent layer are formed on separate films, and these two layers are brought together with a trowel.

To explain this, as shown in FIG.
A fluorescent layer 2 is applied onto another film Z as shown in bl. Furthermore, the coating surfaces of the insulating layer and the fluorescent layer are the same? 1. Let it be sweet and increase the pressure.

This method will be explained in detail in further detail. The film 7 to which the fluorescent layer 2 is coated is coated with, for example, fluorescent material (for example, "fluorescent") on the surface to which the layer is coated.
Use by spreading a release agent (recone type, Teflon thread, etc.). Did you apply this fluorescent layer coating film to Albanium Protector 4? Heat and press the edge J-3 with the coated surfaces together,
If film 7 is released by +1, ? The edge layer 3Vc fluorescent layer 2 is transferred to complete the EL element. Instead of spreading the stripping agent onto the film 7, it can also be mixed into the fluorescent layer and transferred.

In order to transfer the fluorescent layer onto the VC insulating layer and finish the fluorescent layer surface uniformly, the film 7 is coated with the fluorescent X layer.
It is necessary to make the entire surface smooth, so (the roughness of the IJ coating surface should be 5 μm)
less than

After peeling off the film 7, the phosphor layer surface with good surface smoothness and the 4-layer side of the transparent 2S conductive film are heated and pressed using a metal roll, but the roll surface ffl thickness is less than 5 layer m. Use the one.

Next, in addition to the present invention, Q) method examples will be described. 6. A fluorescent layer is completely coated on the conductive layer side of a transparent conductive film, and insulation is coated on the coated surface and an aluminum film; It is also possible to press and bond directly to the tetraelectric film. In this case, before coating the phosphor layer, it is necessary to apply silver paste as a power supply to the layer side of the transparent electropolymer film in advance.

In the present invention, in order to improve the relationship between the fluorescent layer and the insulating layer, what is used for the fluorescent layer? As the #I3 resin, a resin having a lower melting point than IfI3 diN resin used for the insulating layer is used.

Also, Nabeyuki 1 used for fluorescent layer and insulating layer! If the melting points of the resins are the same or if the same high gx resins are used,
The density of the meat layer can be improved by adjusting the temperature and pressure during hot pressing.

[Effect]

According to the method of the present invention, it is possible to confirm the presence of uneven coating, pinholes, etc., and their removal is easy.

Fluorescent layer crow! l! [If the resin has a lower melting point than that used for the insulating layer, the phosphor with a larger average particle size will disperse in the fluorescent layer during heat pressure N.

As a result of void formation at the interface with the relatively non-flowing H1, the close contact between the fluorescent layer 1 and the P22 layer is impaired.

Also, is there a paste that has phosphor dispersed throughout the film with excellent smoothness? When coated with a fluorescent layer on 20 surfaces, the fluorescent light in contact with the film becomes a very flat tR, which can be transferred to the entire insulating layer to obtain a luminescent surface that is superior to other conditions.

〔Example〕

1. Insulation I - Polyethylene terephthalate film with a surface roughness of less than 5 μm on which a silicone release agent was vapor-deposited and VCP2 edge layer A fluorescent layer was formed using a high dielectric resin with a low melting point. Each was coated using the n-comma coater method.

After removing pinholes, uneven coating, etc. that occurred on the coated surface of the fluorescent layer and Absolute Rf@, the inner coated surface was turned over and bonded under heat.

Furthermore, to explain Fig. 2 1CJ-, 20 surfaces of the fluorescent layer obtained by peeling off the polyethylene terephthalate film (
Light-emitting surface side) A K transparent tetraelectric film 1 was laminated, and a water replenishing film 5 was further laminated on both sides, and then covered with a moisture-proof film 6 to obtain an organic dispersion type EL panel.

2.7 Fluorescent layer mixed with a silicone release agent was coated on a polyethylene terephthalate film with a surface roughness of less than 5 μm, on which no release agent was deposited, by a comma coater method. In other respects, an EL panel was obtained in the same manner as the actual kJt+IN.

5. On a transparent conductive film printed with silver paste as a power feeder, a fluorescent layer using Takato Seishin resin, which has a lower melting point than the IP and edge layer resins, was coated using a comma coater method. After removing pinholes and uneven coating, the coated surface of the insulating layer and the coated surface of the fluorescent layer coated on the aluminum ζ film were brought together and bonded under heat. In this way, an EL device was obtained using a transparent four-electrode film by the direct method. Are other conditions enforced? lJ l
An EL panel was obtained in the same manner.

4. Use the same Takatoki resin for the insulating layer and fluorescent #, and use the same resin for the fluorescent layer and ? Temperature and pressure cracking Example 11 when thermo-compressing the edges
I adjusted it to a higher level. Other conditions were the same as in Example 1 to obtain an EL panel.

[Comparative example]

Next, for comparison, an EL panel was obtained using a conventional method.

1. First, an insulating layer is coated on the aluminum film using a comma coater method, and then a phosphor layer is coated on the insulating layer using a high nickel core resin and a low melting point crystal resin. Laminate a transparent film with clear holes and uneven coating on the fluorescent L-surface (light-emitting surface). An EL panel was obtained in the same way as the sledding and other 9 techniques, and the ability β defeat 1.

2. A PET film with a surface roughness of less than 10 μm/recone thread peeling and vapor deposition was used. 70,) In addition, an EL panel was obtained in the same manner as in Example 1.

5. The high-quality resin used for the P2 edge layer has a lower melting point than that used for the fluorescent 7-. An EL panel was obtained in the same manner as in Example 1.

Example+, 2. 3. 4 and Comparative Example L 2,5
Table 1 shows a comparison of the characteristics of the organic dispersion type EL panels obtained.

table (Note) *10 samples were evaluated based on their appearance.

*2 To measure the variation in the thickness of the EL cord, the thickness was measured at the four corners and the center of the EL cord at 405 points, and the difference between the maximum and minimum values was shown.

*3 Shows poor brightness when applied voltage + 0 OV - frequency 400 WJj.

〔Effect of the invention〕

In Table 1, it can be seen that there is a remarkable difference in the results of the present invention and the conventional method in terms of unevenness, and also in terms of thickness variation and 54 degrees.

By the method of the present invention, as a result of coating the fluorescent layer and all five insulating layers separately, it becomes easy to confirm the presence of pinholes, coating unevenness, etc. and remove them, and the yield rate of EL panel manufacturing is improved. did.

The organic dispersion type EL panel obtained by the method of the present invention has a uniform light-emitting surface without appearance defects such as unevenness and spots, regardless of the size or power.

Also, the density of the fluorescent layer and insulating layer has been improved, and the fluorescent layer is formed into a smooth film. By transferring it to a durable layer to obtain a smooth light-emitting surface, it was possible to significantly reduce the variation in coating film thickness as an EL layer.

[Brief explanation of the drawing]

Figure 1 fat tbl (c) is an explanatory diagram of the present invention, Figure 2
The figure is a sectional view of an EL panel according to the present invention, and Figure 3 is a sectional view of a conventional EL panel.
It is a sectional view of the L-slip. ......Transparent conductive film, ...Loquat layer, ...Water extraction film. 8"-〇 film. 2...Fluorescence/i1,...Aluminum group, 6...Iuk':) Inimu,

Claims (4)

[Claims] 1. A method for manufacturing an organic dispersion type EL panel, which comprises forming an insulating layer and a fluorescent layer on separate films, and then laminating the two layers so that they are in contact with each other. 2. The organic dispersion type EL according to claim 1, wherein the fluorescent layer is coated on a film with a smooth surface that is easy to peel.
How to manufacture panels. 3. 3. The method of manufacturing an organic dispersion type EL panel according to claim 2, further comprising adhering a conductive film to the smooth surface of the fluorescent layer transferred onto the insulating layer. 4. 2. The method of manufacturing an organic dispersion type EL panel according to claim 1, wherein the high dielectric resin used for the fluorescent layer is a high dielectric resin having the same or lower melting point than the resin used for the insulating layer.