JPH065190U - Electroluminescent device - Google Patents

Abstract

(57) [Summary] [Structure] The light emitting layer 3 is sandwiched between the electrodes 1 and 4 at least one of which is transparent to form the laminated body 5. The laminated body 5 is sandwiched between the pair of resin covering films 6 to form an electroluminescent device. The laminated body 5 and the resin cover film 6 are formed into substantially the same shape, and the periphery of the electroluminescent element is sealed with an insulating material 7. [Effect] Since the laminated body 5 and the resin outer cover film 6 have substantially the same shape, the area of the electroluminescent element becomes a substantially light emitting area, and the area efficiency of the non-light emitting portion is extremely small, and the resin outer cover is good. Since the films 6 are not laminated, no warpage due to the difference in heat shrinkage occurs.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electroluminescent device (EL device).

[0002]

[Prior art]

 As shown in FIGS. 3 and 4, an EL element of this type includes an insulating layer 2 formed by dispersing barium titanate powder in cyanoethyl cellulose (organic substance) on a back electrode 1 made of aluminum foil, and A light-emitting layer 3 formed by dispersing phosphor powder of zinc sulfide: copper in the same organic substance was laminated, while an indium-tin alloy was used on one side of a transparent polyethylene terephthalate film (PET) 4a. A transparent electrode 4 having a transparent conductive layer 4b made of ITO is prepared, and the transparent electrode 4 is sandwiched between the insulating layer 2 and the light emitting layer 3 so that the conductive layer 4b is in contact with the light emitting layer 3. It is known that a laminated body 5 is formed by sandwiching the laminated body 5 by thermocompression sealing (lamination) with a pair of resin outer covering films 6 made of a transparent trifluoroethylene chloride film (example). If, see Japanese Unexamined Utility Model Publication No. 63-194498).

[0003]

[Problems to be solved by the device]

 In such an EL element, the resin jacket films 6 sandwiched between the resin jacket film 6 and the resin jacket films 6 protruding from the periphery of the laminate body 5 are laminated, and a sealing dimension of 2 mm or more is required. ing. Since this sealing portion naturally becomes a non-light emitting portion, there is a problem that the outer dimension becomes large relative to the light emitting area of the EL element, which is a particular problem in the case of an EL element having a small light emitting area.

Focusing on this problem, by sandwiching the laminated body 5 between the resin outer skin films 6 folded in two, and laminating the resin outer skin films 6 protruding from the side end portions of the laminated body 5 together. There is an EL element having a small outer dimension for the area of the light emitting portion (see Japanese Patent Publication No. 4-7559), but the sealing portion remains, and the outer dimension is large for the light emitting area of the EL element. The problem has not been resolved.

In addition, in the case of the conventional EL device, it has been pointed out that a warp caused by a difference in heat shrinkage ratio between the electrodes 1 and 4 is observed in the laminating step (Japanese Patent Publication No. 3-238792). (See the official gazette).

Focusing on this problem, there is a method (see Japanese Patent Application Laid-Open No. 3-238792) in which opposing portions of the peripheral portions of both electrodes 1 and 4 are sealed with an adhesive. If the transparent electrode 4 is formed in a predetermined shape in advance on the peripheral portion and is overlapped with the back electrode 1 while aligning them with each other, the alignment of both electrodes 1 and 4 is difficult and the manufacturing process is complicated, and Even in the case of an EL element, a non-light emitting portion is also generated in the outer peripheral edge portion from the adhesive, so that there is a problem that the outer dimension becomes large relative to the light emitting area of the EL element.

[0007]

[Means for Solving the Problems]

 The present invention focuses on the above-mentioned problems, and relates to an electroluminescent device in which a laminate having a light emitting layer sandwiched between at least one transparent electrode is sandwiched between a pair of resin outer films, and the laminate and the resin outer film are provided. And have substantially the same shape, and the periphery of the electroluminescent element is sealed with an insulating material.

[0008]

[Action]

 In the EL element, since the laminate and the resin skin film have substantially the same shape, the area of the EL element becomes a substantially light emitting area, and the area efficiency of the non-light emitting portion is extremely small. Since the films are not laminated, warpage due to the difference in heat shrinkage does not occur.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, but the same or equivalent portions as those of the embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a cross-sectional view of an essential part of an embodiment of the present invention, in which an insulating layer 2 and a light emitting layer 3 are laminated and formed on a back electrode 1, and a transparent electrode 4 and a conductive layer 4b thereof are formed thereon. The insulating layer 2 and the light emitting layer 3 are sandwiched between the electrodes 1 and 4 so as to be in contact with the light emitting layer 3 to form a laminated body 5. The laminated body 5 is sandwiched by a pair of resin skin films 6, and then the whole body is desired. Is cut and the periphery is sealed with an insulating material 7 such as an epoxy resin adhesive.

By the way, an adhesive (not shown) is previously attached to the surface of the resin cover film 6 facing the laminated body 5, and the resin cover film 6 is attached to the laminated body 5 with this adhesive. When fixing, it is desirable to apply light pressure while heating, but the effect of heat exerted on the EL element is significantly lower than that of the conventional laminate.

Further, since the laminate 5 and the resin outer cover film 6 are cut at the same time, they have substantially the same shape, and the non-light emitting portion is significantly reduced as compared with the conventional one. It should be noted that the laminated body 5 and the resin outer cover film 6 do not have the same shape, but a part of the resin outer cover film 6 is extruded from the side end portion of the laminated body 5 and cut, and the resin outer cover films 6 are laminated together. By fixing it, the temporary fixing of the resin outer cover film 6 can be made more reliable, and even in this case, the non-light emitting portion is reduced as compared with the conventional one, and it affects the EL element. The effect of heat is lower than that of the conventional laminate.

FIG. 2 shows the time until the EL element of this example and the conventional EL element by laminating are installed in the same environment and continuously lit until the initial emission luminance is reduced to 50%. The results show that there is almost no difference in the change between the two, and it was found that the EL element of this example has no practical problem.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention, for example, the insulating layer 2 can be omitted. There are various methods of sealing with the insulating material 7, and for example, application with a syringe or adhesion with a brush is considered.

[0015]

The present invention provides an electroluminescent device in which a laminated body having a light emitting layer sandwiched between at least one transparent electrode is sandwiched between a pair of resin outer films, and the laminated body and the resin outer film are sandwiched from each other. The EL element has a substantially same shape, and the periphery of the electroluminescent element is sealed with an insulating material. Since the laminate and the resin outer cover film have substantially the same shape, the area of the EL element becomes a substantially light emitting area. The area efficiency of the non-light emitting portion is extremely small, and the resin outer films are not laminated, so that it is possible to provide an EL element that does not warp due to the difference in thermal shrinkage.

Furthermore, if the laminate and the resin outer film are cut at the same time, the positions of the two can be reliably determined. Therefore, even if the EL element has a complicated light emitting shape such as a star shape, it can be easily manufactured. You can

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a luminance characteristic diagram of the above embodiment.

FIG. 3 is an exploded perspective view of a main part of a conventional example.

FIG. 4 is a sectional view of a main part of a conventional example of the above.

[Explanation of symbols]

 1 Back Electrode 3 Light Emitting Layer 4 Transparent Electrode 5 Laminated Body 6 Resin Outer Film 7 Insulating Material

Claims (1)

[Scope of utility model registration request] 1. An electroluminescent device comprising a laminate having a light emitting layer sandwiched between electrodes, at least one of which is transparent, sandwiched by a pair of resin skin films, wherein the laminate and the resin skin film have substantially the same shape. An electroluminescent device characterized in that the periphery of the electroluminescent device is sealed with an insulating material.