JPH0315191A - Color filter for el and el element - Google Patents

Abstract

PURPOSE:To facilitate exchanging a filter, and thereby improve maintainability as well as to reduce running cost by kneading fluorescent pigments having a specified luminous color into pressure sensitive adhesives so as to be formed into a film shape, and thereby bonding said film onto the luminous surface of an EL element. CONSTITUTION:A color filter 1 for EL is made up in such a way that fluorescent pigments 2 are kneaded into transparent resin 3 which is of consistency, while being applied onto a sheet of released paper 4 covered by non-contact resin so that a fluorescent film 5 is thereby formed. The color filter 1 for EL is bonded on the luminous surface 12a side of an EL element 11.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an EL (electroluminescence) element, and more particularly to a color adjusting means when a specific luminescent color such as white is desired for the EL element.

[Conventional technology]

Conventionally, when you want the EL element 31 to emit white light, for example, the phosphor 32 used in the EL element 31 basically emits green-blue light, so as shown in FIG. , a fluorescent pigment 33 having a pink luminescent color was mixed with the phosphor 32 to obtain the desired luminescent color, that is, white.

[The plot M that the invention attempts to solve]

However, in the conventional EL element 31 described above, the fluorescent pigment 33 mixed in the phosphor 32 has extremely poor durability against external conditions such as irradiation with ultraviolet rays, and the The fluorescent pigment 33 deteriorates and changes to a basic green-blue luminescent color. For example, when this EL element 31 is used as a backlight for an automobile's liquid crystal instrument panel, the color rendering property changes. This causes problems in terms of maintenance and running costs, such as the red display becoming difficult to read and having to be replaced.
This has become a problem for devices. Furthermore, when EL elements 31 with different luminescent colors are required, it is necessary to mix phosphors 32 with different fluorescent pigments 33, which requires a production line for each luminescent color, which causes problems in terms of management, etc. Problems such as congestion and reduced production efficiency also occurred.

[Means to solve the problem]

As a specific means for solving the above-mentioned conventional problems, the present invention provides an adhesive for EL, characterized in that at least one type of fluorescent pigment having a specific luminescent color is mixed into an adhesive to form a film. By providing a color filter and, in addition, an EL element characterized in that the EL color filter is attached to the light emitting surface side of a green-blue monochromatic EL element, the conventional EL element described above can be improved. This will solve the problems that have arisen in the past.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. What is shown in FIG. 1 shows the first embodiment of the present invention.
In this embodiment, an EL color filter 1 includes a fluorescent pigment 2 mixed into a viscous transparent resin 3, and a release paper 4 coated with a non-adhesive resin such as polyethylene resin. A fluorescent film 5 is formed on top. Incidentally, the fluorescent pigment 2 to be mixed with the transparent resin 3 is not limited to one type, and it is possible to mix a plurality of types of fluorescent pigments with different color development as required such as color rendering properties. What is shown in FIGS. 2 and 3 is also the second embodiment,
For example, when the adhesiveness of the fluorescent film 5 is insufficient, the fluorescent film 5 obtained in the first embodiment
For example, an adhesive eyebrow 6 made of polyisobutylene resin is attached to the EL color filter 7, and the adhesive eyebrow 6 may be attached only to one side as shown in FIG. As shown in FIG. 3, it may be attached to both sides. The one shown in FIG. 4 is also the third embodiment, and in all of the previous embodiments, the fluorescent film 5 is self-supporting, and this fluorescent film 5, that is, the EL color filters 1 and 7, is attached to a flat surface. In some cases, the fluorescent film 5 is easily wrinkled and requires a high degree of skill to adhere, so the fluorescent film 5 is attached to a base material 8 made of, for example, unsaturated polyester resin (typically Mylar resin). It is pasted to form an EL color filter 9. FIG. 5 also shows a fourth embodiment, in which the surface 8b of the substrate 8 of the previous third embodiment, which is the other side of the surface 8a to which the fluorescent film 5 is attached, is An EL color filter 10 is made by pasting an adhesive eyebrow 6. For example, when the fluorescent film 5 has poor adhesiveness, or when the EL color filter IO is required to have adhesion performance on both sides. It is carried out when What is indicated by the symbol 1l in FIG. 6 is an EL element, and this E
The L element 11 includes any one of the EL color filters 1, 7, 9, and 1o shown in FIGS. 1 to 5 (the figure shows an example of the EL color filter 1) and this EL color.・−
It consists of a monochromatic EL element 12 with filters 1, 7, 9, and 10 attached to the light emitting surface 12a side, and the monochromatic EL
The element 12 is different from the conventional example and is composed only of a single phosphor 13 that emits basic green-blue light. Here, for ease of understanding, we will use the above EL as a specific example.
If the explanation is given assuming that the element 11 is required to emit white light, the fluorescent pigment 2 mixed into the fluorescent film 5
EL color filter 1 (or EL color filter 7, 9, 10).
is formed, and this is used as the light emitting surface 12a of the monochromatic EL element 12.
By being attached to the side, the fluorescent pigment 2 that emits pink light is excited by the light emission of the monochrome EL element 12, and the green-blue color of the monochrome EL element 12 is emitted through the EL color filter 1. The pink color is added to the light emission, and the desired white light emission is obtained. Although the above explanation has been made using an example of white light emission, the implementation is not limited to this, and if the fluorescent pigment 2 is selected to emit light of another color or a plurality of emitted colors,
The EL element 11 has a green-blue color as a standard and a fluorescent pigment 2.
By adding the emitted light colors of the above, a light emitting color of any color can be obtained.

[For production]

Next, the operation of the EL element 1l having the above structure will be explained.
The EL color filter has a shorter lifespan because it is separated from the L color filter 1 (or EL color filters 7, 9, and 10) and is attached using adhesive. Even when deterioration occurs in the EL color filter 1, the EL color filter 1 can be easily peeled off and replaced.

【Effect of the invention】

As explained above, according to the present invention, an EL color filter is formed into a film by mixing at least one type of fluorescent pigment having a specific luminescent color into an adhesive, and further, the EL color filter is By affixing the filter to the light-emitting surface side of the monochromatic EL element, fluorescent pigments with a shorter lifespan are integrated into the EL element, thereby preventing the overall lifespan from being shortened, and also preventing the EL element from shortening its lifespan. By making the EL color filter removable due to its viscosity, it is easy to replace the EL color filter even when the fluorescent pigment deteriorates, which improves maintainability during use and improves running fasteners. This has an extremely excellent effect in reducing the amount of water. Furthermore, by configuring the EL color filter separately, for example, even when an EL element other than white is desired, it is only necessary to change the fluorescent pigment used in the EL color filter, which is common to single-color EL elements. Since the production process can be simplified, production management and production processes can be simplified and production efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the EL color filter according to the present invention, FIGS. 2 and 3 are sectional views showing the second embodiment, and FIG. 4 is a sectional view showing the third embodiment. A sectional view showing,
FIG. 5 is a sectional view showing a fourth embodiment, FIG. 6 is a sectional view showing an embodiment of the EL element according to the present invention, and FIG. 7 is a sectional view of a conventional example. 3-------1 Transparent resin 4--1--1 Release paper 5--1 Fluorescent film 8--1 Adhesive eyebrow 8-- 1 base material 1 1 ------- EL element 1 2 ------- 1 monochromatic EL element 1 2 a ------- 1 light emitting surface

Claims (5)

[Claims] (1) A color filter for EL, characterized in that it is made into a film by mixing at least one type of fluorescent pigment having a specific luminescent color into an adhesive. (2) The EL according to claim (1), characterized in that a transparent film-like adhesive layer is attached to at least one surface of the EL color filter.
color filter. (3) The EL color according to claim 1, wherein a base material formed in the form of a film of transparent resin is attached to one surface of the EL color filter. filter. (4) A transparent film-like adhesive layer is attached to the other surface of the base material to which the EL color filter is attached. EL color filter described in item 3. (5) An EL device, characterized in that the EL color filter according to claims (1) to (4) is attached to the light emitting surface side of a green-blue monochromatic EL device.