JP2896977B2 - Electroluminescence device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent electrode and a back electrode, wherein a light emitting layer laminated on the transparent electrode and an insulating layer laminated on the light emitting layer are interposed between the transparent electrode and the back electrode. The present invention relates to an electroluminescence device in which a light emitting layer emits light when an AC electric field is applied between the light emitting layer and the light emitting layer.

[0002]

2. Description of the Related Art In this type of electroluminescent device, attention is paid to the fact that the light emitting layer changes color between light emission and non-light emission, and exhibits a uniform color as a whole when light is not emitted and partially changes color during light emission. In some cases, the ability to express colors is enhanced.

[0003] For example, as shown in FIG.
The light-emitting layer 3 and the insulating layer 4 are interposed between the light-emitting layer 3 and the back electrode 2. The light-emitting layer 3 is divided into a plurality of segments and partially laminated on the transparent electrode 1. Layer 3
An intermediate layer 5 having the same or similar color as that of FIG. 1 is interposed between the back electrode 2 and the insulating layer 4 so as to be located in the background between the segments of the light emitting layer 3 (Japanese Utility Model Application Laid-Open No. 62-124797).
issue). According to this structure, at the time of non-light emission, the light emitting layer 3 and the intermediate layer 5 of the background portion exhibit the same color or an approximate color, and exhibit a uniform color as a whole. It has a different color and is partially discolored.

[0004]

However, in the above-mentioned conventional structure, since the intermediate layer 5 is interposed between the back electrode 2 and the insulating layer 4, the intermediate layer 5 causes a gap between the transparent electrode 1 and the back electrode 2. The electric resistance increases and the luminance decreases during light emission,
Moreover, there is a problem that the distance between the transparent electrode 1 and the back electrode 2 is widened by the intermediate layer 5 to form a thick structure.

Accordingly, an object of the present invention is to provide an electroluminescence device which can be partially changed in color without lowering the luminance during light emission and which can be made thinner.

[0006]

According to the present invention, a light emitting layer laminated on the transparent electrode and an insulating layer laminated on the light emitting layer are interposed between the transparent electrode and the back electrode. An electroluminescence device in which a light emitting layer emits light by applying an AC electric field between the back electrode and
With partially laminated on the transparent electrode a light emitting layer, transparent
The same color as the light emitting layer at the time of non-light emission on the non-laminated part of the light emitting layer on the electrode
Alternatively, non-light-emitting layers of similar colors are stacked . It is desirable that the light-emitting layer and the non-light-emitting layer be disposed so as to overlap in a plane at the boundary. Further, it is desirable that the non-light-emitting layer be formed of an insulating layer.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electroluminescent device to which the present invention is applied will be described with reference to the drawings. In this electroluminescent device, FIGS. 1 and 2
Polyethylene terephthalate (PET) as shown in
A transparent electrode 11 made of indium tin oxide (ITO) or the like vacuum-deposited on a rectangular transparent film 10 made of synthetic resin such as
3, 14, non-light-emitting layer 15, insulating layer 16, and back electrode 1
7 is printed and formed by a screen printing method or the like.

The transparent electrode 11 is laminated on one side of the transparent film 10 over the entire area. The transparent electrode 11 has a partially rectangular connector portion 18 laminated at an end portion. The connector portion 18 is formed by printing and drying a carbon paste, and is different from the transparent electrode 11. Body.

The light-emitting layers 12, 13, and 14 are partially laminated on the transparent electrode 11 so as not to overlap the connector section 18 in plan view, and have shapes A, B, and A, respectively, as viewed from the transparent film 10 side. C. Light emitting layer 1
Nos. 2, 13 and 14 are formed by printing and drying an ink obtained by mixing and stirring a luminous body obtained by doping copper into zinc sulfide as a fluorescent substance and a fluororesin binder. , And changes color to blue-green during light emission.

The non-light-emitting layer 15 is provided on the transparent electrode 11 so as not to overlap the connector portion 18 and the light-emitting layers 12, 13 and 14 in plan view.
The light emitting layers 12, 13, and 14 are stacked on the non-stacked portions of the layers 13 and 14 so as to be flush with each other. The non-light-emitting layer 15 is formed by printing and drying an ink obtained by mixing and stirring zinc sulfide as a fluorescent substance and a fluororesin binder, and has the same color as the light-emitting layers 12, 13, and 14 during non-light-emission. It has a white color.
The non-light-emitting layer 15 and the light-emitting layers 12, 13, and 14 may be formed by printing the light-emitting layers 12, 13, and 14 after printing the non-light-emitting layer 15, or by printing the light-emitting layers 12, 13, and 14 after printing the light-emitting layers 12, 13, and 14. 15 can be formed by printing.

The insulating layer 16 is formed of each of the light emitting layers 12, 13, 14
Are stacked on the light-emitting layers 12, 13, and 14 and the non-light-emitting layer 15 so as to overlap in a plane. The insulating layer 16 is formed by printing and drying an ink obtained by mixing and stirring barium titanate, which is a high dielectric substance, and a fluororesin binder, and has the same color as the non-light emitting layers 12, 13, and 14. It has a white color.

The back electrode 17 is arranged such that the insulating layer 1 is overlapped with the light emitting layers 12, 13, and 14 via the insulating layer 16.
6 are stacked. The back electrode 17 is formed by printing and drying a carbon paste. A connector 19 adjacent to the connector 18 of the transparent electrode 11 is formed on the back electrode 17, and an AC electric field is applied between the connector 19 and the transparent electrode 11 through the connector 18 of the transparent electrode 11. It has become. That is, a tongue piece 15a adjacent to the connector portion 18 of the transparent electrode 11 is formed on the non-light emitting layer 15, and a tongue piece 16a located on the tongue piece 15a is formed on the insulating layer 16; The connector portion 19 is formed by printing. A connector (not shown) connected to the connector 18 and the connector 19 and connected to an AC power supply (not shown) is mounted near the connector 18, and the connector 18 and the connector 19 are connected via the connector. Is applied with an AC electric field. When printing the back electrode 17, the connector portion 18 can be simultaneously formed by printing, thereby simplifying the manufacturing process.

According to the above configuration, when an AC electric field is applied between the transparent electrode 11 and the back electrode 17, the light emitting layer 1
2, 13, and 14 emit light, and letters A, B, and C emerge.
That is, when the light-emitting layers 12, 13, and 14 do not emit light, the light-emitting layers 12, 13, and 14 have the same white color as the non-light-emitting layer 15 and have a uniform color as a whole.
4, the light emitting layers 12, 13, and 14 are non-light emitting layers 1
The color becomes blue green different from the color No. 5 and partially discolored, and letters A, B and C emerge.

Since the non-light-emitting layer 15 is laminated on the non-laminated portion of the light-emitting layers 12, 13, and 14 on the transparent electrode 11, the non-light-emitting layer 15 allows the transparent electrode 11 and the back electrode 1 to be stacked.
7, the letters A, B, and C can be embossed by partially discoloring without lowering the luminance at the time of light emission, and the non-light-emitting layer 15 allows the transparent electrode 11 and the back electrode 17 to emit light. Is not widened and the thickness can be reduced. Note that a slight gap is formed between the non-light-emitting layer 15 and the light-emitting layers 12, 13, and 14, which is used to absorb a printing error between the non-light-emitting layer 15 and the light-emitting layers 12, 13, and 14. Things. In addition, the non-light-emitting layer 15 and the light-emitting layers 12, 13,
Even if a part of the insulating layer 16 is visually recognized through the gap between the insulating layer 16 and the non-light-emitting layer 15, the color of the non-light-emitting layer 15 is set to the same white color as that of the insulating layer 16; The color is white as a whole, and the visibility is not deteriorated.

In the above example, the light emitting layers 12, 13, and 14 emit light at the same time. However, as shown in FIG. The connector section 19 adjacent to the connector section 18 of the transparent electrode 11 may be provided independently on each back electrode 17. In this case, the light emitting layers 12, 1
3, 14 can be emitted independently or simultaneously, and the degree of freedom in displaying characters A, B, and C is improved.

In the above example, the light-emitting layers 12, 13, and 14 are formed using an ink containing no color pigment, and when the light-emitting layers 12, 13, and 14 do not emit light, the light-emitting layers 12, 13, and 14 are formed.
Although the light-emitting layers 12, 13, and 14 were formed using an ink containing a color pigment, the light-emitting layers 12, 13, and 14 were formed when the light-emitting layers 12, 13, and 14 did not emit light.
14 has a configuration other than white, and the non-light-emitting layer 15 is formed by using an ink colored to the same or similar color as the light-emitting layers 12, 13, and 14 in the non-light-emitting time. Is also good.

In the above example, the non-light-emitting layer 15 and the light-emitting layers 12, 13, and 14 are stacked on the transparent electrode 11 so as not to overlap in a plane. However, as shown in FIG. After the printing of the light-emitting layer 15, the light-emitting layers 12, 13, and 14 may be printed so that the light-emitting layers 12, 13, and 14 and the non-light-emitting layer 15 are arranged so as to overlap in a plane at the boundary. In this case,
There was no gap at the boundary between the light-emitting layers 12, 13, and 14 and the non-light-emitting layer 15, and in particular, the color of the non-light-emitting layer 15 was set to a color other than white different from that of the insulating layer 16 to diversify colors. Even in such a case, the insulating layer 16 of a different color from the non-light-emitting layer 15 may pass through the gap between the non-light-emitting layer 15 and the light-emitting layers 12, 13, and 14.
The visibility is not degraded, such as part of is visible,
In addition, the non-light-emitting layer 15, the light-emitting layers 12, 1
Even if the positions of the light-emitting layers 3, 14 are slightly shifted, the overlap between the non-light-emitting layer 15 and the light-emitting layers 12, 13, 14 can be set at the boundary between the light-emitting layers 12, 13, 14 and the non-light-emitting layer 15. A gap can be prevented from occurring, and visibility can be easily prevented from deteriorating without increasing printing accuracy and the like. Light emitting layer 1
In order to arrange the 2, 13, 14 and the non-light-emitting layer 15 so as to overlap with each other in a plane at the boundary, not only the case where the light-emitting layers 12, 13, 14 are printed after the non-light-emitting layer 15 is printed, but also The non-light-emitting layer 15 may be printed after printing the light-emitting layers 12, 13, and 14, in which case the light-emitting layer 15 and the light-emitting layers 12, 13,.
14 is reversed.

In the above example, the non-light-emitting layer 15 is provided independently. However, as shown in FIG. 5, the non-light-emitting layer may be constituted by the insulating layer 16, and in this case, the manufacturing The process is simplified, and the manufacturing cost can be reduced.

[0019]

As described above, in the electroluminescence device according to the present invention, the light emitting layer is partially laminated on the transparent electrode and the light emitting layer on the transparent electrode is not laminated.
Non-light-emitting layer of the same color or similar color as the light-emitting layer at the time of non-light emission
Are laminated, the electric resistance between the transparent electrode and the back electrode does not increase due to the non-light-emitting layer, and the color can be partially changed without lowering the luminance during light emission. Is not widened and the thickness can be reduced. In addition, if the light-emitting layer and the non-light-emitting layer are disposed so as to overlap in a plane at the boundary, no gap is formed at the boundary between the light-emitting layer and the non-light-emitting layer. Even if the color is diversified by setting to a different color, a part of the insulating layer of a different color from the non-light-emitting layer is visually recognized through the gap between the non-light-emitting layer and the light-emitting layer. Even if the position of the non-light-emitting layer or the light-emitting layer is slightly shifted due to a manufacturing error or the like without deteriorating the visibility, the light-emitting layer and the non-light-emitting layer can be set by setting the overlapping amount of the non-light-emitting layer and the light-emitting layer. It is possible to prevent a gap from being generated at the boundary portion between them, and it is possible to easily prevent the visibility from deteriorating without increasing the manufacturing accuracy and the like. Further, when the non-light-emitting layer is formed of an insulating layer, the manufacturing process can be simplified and the manufacturing cost can be reduced.

[Brief description of the drawings]

1A is a plan view of an electroluminescent device to which the present invention is applied, and FIG. 1B is a cross-sectional view of FIG.

FIG. 2 is a rear view of FIG.

FIG. 3 is a back view showing a modified example of the back electrode corresponding to FIG. 2;

FIG. 4 is a sectional view showing another example corresponding to FIG. 1 (b).

FIG. 5 is a sectional view showing another example corresponding to FIG. 1 (b).

FIG. 6 is a sectional view showing a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Transparent electrode 12 Light emitting layer 13 Light emitting layer 14 Light emitting layer 15 Non-light emitting layer 16 Insulating layer 17 Back electrode

Continued on the front page (72) Inventor Sadayuki Takahashi 4-1-1, Taihei, Sumida-ku, Tokyo, Japan Inside Seikosha Co., Ltd. (72) Inventor Hideki Okuyama 4-1-1, Taihei, Sumida-ku, Tokyo, Japan Inside Seikosha Co., Ltd. (56) reference JitsuHiraku Akira 62-123689 (JP, U) JitsuHiraku flat 2-109393 (JP, U) JitsuHiraku flat 3-52997 (JP, U) (58 ) investigated the field (Int.Cl. ⁶ , DB name) H05B 33/22

Claims (3)

(57) [Claims] 1. A light emitting layer laminated on the transparent electrode and an insulating layer laminated on the light emitting layer are interposed between the transparent electrode and the back electrode, and between the transparent electrode and the back electrode. An electroluminescence device in which the light-emitting layer emits light by applying an AC electric field to the light-emitting layer, wherein the light-emitting layer is partially laminated on the transparent electrode, and on a non-laminated portion of the light-emitting layer on the transparent electrode. No light emission
When the non-light emitting layer of the same color or similar color as the above light emitting layer is laminated
An electroluminescence device, characterized in that: 2. The electroluminescent device according to claim 1, wherein the light emitting layer and the non-light emitting layer are disposed so as to overlap in a plane at a boundary between the light emitting layer and the non-light emitting layer. 3. The electroluminescent device according to claim 1, wherein said non-light emitting layer is constituted by said insulating layer.