JP2003197379A - Conductive material holding sheet and el light emitting device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an EL light emitting device allowing a user to easily form a desired light emission pattern. <P>SOLUTION: In this EL light emitting device 10, a transparent resin sheet 14, an EL light emitting layer 16, an insulation layer 18, a permeation layer (conductive material holding sheet) 22, a soluble layer 24 are layered sequentially in an EL light emitting substrate 42. In the El light emitting base board 42, ink 46 containing a solvent is stuck in a desired pattern by means of an ink jet head 44 for locally dissolving the soluble layer 24 and exposing the permeation layer 22, and the permeation layer 22 is impregnated with a fluid conductive material 48. When a voltage is impressed between a back electrode 20 conducting with the conductive material 48 and the transparent conductive layer 12, an area matching the locally dissolved pattern in the soluble layer 24 is locally illuminated in the EL light emitting layer 16. Consequently, the EL light emitting substrate 42 can be easily illuminated in a desired light emitting pattern by the user. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EL light emitting substrate having an EL light emitting layer and an EL light emitting device using the same, and more particularly to a technique enabling a user to arbitrarily draw the light emitting pattern. .

[0002]

2. Description of the Related Art By applying an AC voltage to a transparent electrode and a back electrode sandwiched in the thickness direction of an EL light emitting layer made of an electroluminescent material, the EL light emitting layer is locally formed in a light emitting pattern corresponding to the shape of the back electrode. There is known an EL light emitting device of a type that emits light. For example, the utility model registration No. 3034483 filed by the applicant earlier is that. Such a sheet-shaped thin light emitting device is generally configured to have flexibility as a whole, and is used for various purposes as a backlight of a light emitting display plate, a backlight of a light emitting decorative plate, and the like.

[0003]

The EL light emitting device as described above emits light in a light emitting pattern defined by the light transmitting portion of the mask overlaid on the entire front surface thereof. There is difficulty in easily creating or changing the corresponding light emission pattern. Further, it is difficult to create a mask for a complicated pattern, a thin pattern, a pattern including a blur, etc., and there is a limitation in the degree of freedom of expression.

On the other hand, it has been proposed that a back electrode having a shape corresponding to a desired light emitting pattern is formed by applying a conductive paste by screen printing, but a user can easily make a screen plate. However, there is a drawback that the cost cannot be increased and the cost becomes high.

The present invention has been made in view of the above circumstances. An object of the present invention is to provide an EL light emitting substrate and an EL light emitting device using the same which allow a user to easily create a desired light emitting pattern. To provide.

[0006]

[Means for Solving the Problems] A gist of a conductive material holding sheet used in an EL light emitting device of the first invention for achieving the above object is to provide an EL light emitting layer having an EL light emitting body. In the EL light emitting device, a conductive material holding sheet for holding a conductive material in a pattern corresponding to the light emitting pattern, which is laminated on one surface of the EL light emitting layer in order to cause the EL light emitting layer to emit light in a desired light emitting pattern. The liquid conductive material is held in a state of being impregnated at least in the thickness direction, the absorbent being composed of an absorbent for absorbing the applied liquid conductive material.

[0007]

According to this structure, the liquid conductive material applied on the conductive material holding sheet made of the absorbent is at least penetrated in the conductive material holding sheet in the thickness direction. Since it is held, an AC voltage is applied between the liquid conductive material held in the conductive material holding sheet close to the EL light emitting layer and the conductive layer located on the opposite side of the EL light emitting layer. By doing so, the portion of the EL light emitting layer corresponding to the portion where the liquid conductive material held by the conductive material holding sheet has permeated is made to emit light in a desired pattern.

[0008]

[Other Aspects of the First Aspect of the Invention] Preferably, the conductive material holding sheet includes a soluble layer locally dissolved by a liquid conductive material on a side opposite to the EL light emitting layer. It is a thing. By doing so, the region corresponding to the pattern in which the soluble layer is locally dissolved in the EL light emitting layer is locally emitted, so that the EL light emitting substrate can easily emit light in a desired light emitting pattern on the user side. To be

Further, preferably, in the EL light emitting device capable of emitting light in a desired light emitting pattern using the conductive material holding sheet, on the side opposite to the EL light emitting layer of the conductive material holding sheet, A plurality of liquid conductive materials that are permeated into the conductive material holding sheet and a conductive layer laminated on the other surface of the EL light emitting layer, A plurality of conductive coating layers among the patterns corresponding to the pattern of the liquid conductive material permeated into the conductive material holding sheet by applying a driving voltage between the layers and the conductive coating layer. The parts emit light at independent timings. If you do this,
When a liquid conductive material is attached in a desired pattern using an inkjet head of an inkjet printer or a brush, the soluble layer to which the liquid conductive material is attached is locally dissolved to form a conductive material holding sheet. Since it is locally exposed, the conductive material holding sheet is impregnated with a liquid conductive material, and the conductive layer is laminated on the other surface of the EL light emitting layer so as to be conductive with the liquid conductive material. By applying a voltage in between, a plurality of regions of the EL light emitting layer corresponding to the locally dissolved pattern of the EL layer are caused to emit local light at different timings. The EL light emitting substrate can easily emit light.

Further, preferably, the conductor layer laminated on the other surface of the EL light emitting layer is made of a transparent conductive material laminated on a transparent sheet, and the other surface side of the EL light emitting layer is formed. Emits light through the transparent conductive material. By doing so, a desired light emitting pattern is displayed through the transparent conductive material.

Further, preferably, the conductive material holding sheet is provided with a conductive mesh pattern in which a conductive paste is fixed to the surface in a mesh pattern on the side opposite to the EL light emitting layer. By doing so, the liquid conductive material applied to and permeated to the conductive material holding sheet conducts to the conductive mesh pattern, so that the liquid conductive material permeated into the conductive material holding sheet is It eliminates the need to connect lead wires one by one to establish continuity.

Further, it is preferable that the conductive material holding sheet can be used to emit light in a desired light emitting pattern.
The L light emitting device includes a conductive mesh pattern of a conductive material holding sheet laminated on one surface of the EL light emitting layer and a conductive layer laminated on the other surface of the EL light emitting layer, and the conductive mesh pattern is formed. When a drive voltage is applied between the conductive material layer and the conductive material layer, the conductive material holding sheet emits light in a pattern corresponding to the pattern of the liquid conductive material. By doing so, when the liquid conductive material is attached in a desired pattern using an inkjet head of an inkjet printer or a brush, the liquid conductive material can be electrically connected to the conductive mesh pattern,
By applying a voltage between the conductive mesh pattern and the conductive layer laminated on the other surface of the EL light emitting layer, the E
Since a plurality of regions of the L light emitting layer corresponding to the application pattern of the liquid conductive material are caused to emit local light at different timings, the EL light emitting substrate can easily emit light in a desired light emitting pattern on the user side. Further, it is possible to eliminate the connection of the lead wires one by one in order to conduct the liquid conductive material which has permeated the conductive material holding sheet.

Preferably, the conductor layer laminated on the other surface of the EL light emitting layer is made of an aluminum foil, and emits light from the one surface side of the EL light emitting layer through the conductive mesh pattern. To do. In this case, the liquid conductive material needs to be translucent, but the application pattern and the light emission pattern of the liquid conductive material are not inverted and are displayed in unison. Also,
Since the conductor layer laminated on the other surface of the EL light emitting layer is made of an inexpensive aluminum foil, the display device becomes inexpensive.

Also, preferably, the conductor layer laminated on the other surface of the EL light emitting layer is made of a transparent conductive material laminated on a transparent sheet, and the other surface side of the EL light emitting layer is formed. Emits light through the transparent conductive material. By doing so, even if the liquid conductive material is a non-translucent material containing carbon particles or the like, the light emission pattern is displayed without being hindered by the liquid conductive material.

Preferably, the liquid conductive material is
A pen or an ink jet printer is used to locally permeate the conductive material holding sheet in a desired light emitting pattern. By doing so, the light emitting pattern is formed in a desired pattern. For example, a brush can be used to obtain a unique light emission pattern, and an ink jet printer can be used to obtain a light emission pattern created using graphic software on a personal computer.

[0016]

A second aspect of the present invention for solving the above-mentioned problems is to provide an EL light-emitting device including an EL light-emitting layer having an EL light-emitting body. A conductive material holding sheet for holding a conductive material in a pattern corresponding to the light emitting pattern, the conductive material holding sheet being laminated on one surface of the EL light emitting layer to emit light in a desired light emitting pattern. Is provided with a large number of protrusions protruding to the opposite side, and the applied liquid conductive material is held in the applied pattern.

[0017]

According to the second aspect of the invention, since the liquid conductive material applied on the conductive material holding sheet is held by the large number of projections, the liquid conductive material held by the conductive material holding sheet is held. By applying an AC voltage between the electroconductive material of 1) and the electroconductive layer located on the opposite side of the EL light emitting layer, the liquid electroconductive material held by the electroconductive material holding sheet of the EL light emitting layer penetrated. A portion corresponding to the portion is made to emit light in a desired pattern.

[0018]

[Other Embodiments of the Second Aspect of the Invention] Here, it is preferable that the plurality of projections are elongated ridges that are parallel to each other, and that the tip end of the ridges are coated with the applied liquid conductive material. A linear conductive layer for electrical continuity is provided. Further, preferably, the EL light emitting device capable of emitting light in a desired light emitting pattern using this conductive material holding sheet is a tip end portion of a ridge of the conductive material holding sheet laminated on one surface of the EL light emitting layer. A linear conductive layer provided in, and a conductive layer laminated on the other surface of the EL light emitting layer, by applying a drive voltage between the linear conductive layer and the conductive layer, Light is emitted in a pattern corresponding to the pattern of the liquid conductive material held by the conductive material holding sheet. With this configuration, when the liquid conductive material is applied in a desired pattern by using an inkjet head of an inkjet printer or a brush, the liquid conductive material is formed into a linear shape provided on the tip of the ridge. Since it is electrically connected to the conductive layer, by applying a voltage between the linear conductive layer and the conductive layer laminated on the other surface of the EL light emitting layer, the liquid conductive material in the EL light emitting layer is applied. Since a plurality of regions corresponding to the coating pattern are locally emitted at different timings, the EL light emitting substrate can easily emit light with a desired emission pattern on the user side. Further, it is possible to eliminate the connection of the lead wires one by one in order to conduct the liquid conductive material which has permeated the conductive material holding sheet.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view showing a thin EL light emitting device 10 according to an embodiment of the present invention. This EL light emitting device 10
Is locally light-emitted and displayed with the light-emission pattern 11 drawn on the user side, for example.

FIG. 2 is a perspective view showing the back surface of the EL light emitting device 10, and FIG. 3 is a cross-sectional view of essential parts for explaining the structure of the EL light emitting device 10. 2 and 3, E
The L light emitting device 10 is laminated in such a manner that a flexible transparent resin sheet 14 made of, for example, a PET resin film, which is provided with a transparent conductive layer 12 such as ITO, on one surface, and the transparent resin sheet 14 is closely attached to one surface. A flexible EL (electroluminescence) light emitting layer 16 and a flexible insulating sheet (insulating layer) 18 which is laminated in a state of being in close contact with the EL light emitting layer 16 and preferably contains inorganic particles, and for selective light emission The back electrode layer 20 provided on one surface of the resin insulating sheet 18
It has a laminated structure in which and are sequentially laminated.

The EL light emitting layer 16 is formed by, for example, bonding a large number of microcapsules in which phosphor particles or phosphor particles are covered with an insulating material with a resin or the like, and an AC electric field is applied thereto. As a result, a predetermined emission color, for example, blue-green is emitted. Also, the insulating sheet 1
No. 8 contains a white pigment such as titanium oxide. Further, the back surface electrode layer 20 is laminated on the insulating sheet 18 in a state where it is detachably loosely adhered, and a permeation layer 22 capable of permeating a liquid, and the insulation sheet 18 of the permeation layer 22.
A soluble layer 24 that is provided so as to cover the side opposite to that in which a desired light emitting pattern region can be dissolved, and a flexible conductive sheet that is in close contact with the entire back surface of the soluble layer 24. And 26. This conductive sheet 26
Is a material formed by bonding carbon particles with a resin or the like, a metal vapor-deposited film such as an ITO film, or a metal foil such as copper or aluminum and has conductivity. ing.

The permeation layer 22 functions as a conductive material holding sheet for absorbing and holding a liquid conductive material, and is made of silica, silicon dioxide, talc, bentonite, calcium carbonate, kaolin, and sedimentation. A material in which a liquid such as calcium sulfate is mixed with a substance forming the soluble layer 24 or a binder such as CMC or a sizing agent and is relatively loosely bound to allow the liquid to penetrate at least in the thickness direction. Is. Therefore, the permeation layer 22
In some cases, the boundary between the soluble layer 24 and the soluble layer 24 cannot be distinguished. The soluble layer 24 includes polyvinyl alcohol, vinyl acetate, carboxymethyl cellulose, starch, sodium alginate, when the ink applied to the soluble layer 24 to draw a desired light emission pattern is water-soluble. Substances that become viscous when dissolved in water, such as casein, methylcellulose, and gum arabic, are used. When the ink applied to the soluble layer 24 to draw a desired light emission pattern is oily, nitrocellulose, ethylcellulose, ethylhydroxyethylcellulose, acrylic resin, vinyl chloride, vinyl acetate copolymer A substance soluble in a solvent such as coalesce, rosin ester, petroleum resin, maleic acid resin, polyester resin, ketone resin, chlorinated rubber, cyclized rubber, alkyd resin, polyurethane resin, epoxy resin and melamine resin is used.

The edge portions of the EL light emitting layer 16, the resin insulating sheet 18, the permeation layer 22, the fusible layer 24, and the conductive sheet 26, which are laminated on each other, are located inside the edge of the transparent resin sheet 14. The insulating film 34, which is a resin resist film, is formed on the entire surface of the conductive sheet 26 excluding the edge portion by screen printing, and the resin of the edge portion of the transparent resin sheet 14 is formed. An insulating film 36, which is a resin resist film, is formed on a part of the insulating sheet 18 side. Further, a conductive paste is applied by screen printing to the edge of the conductive sheet 24 on the resin insulating sheet 18 and the edge of the transparent conductive layer 12 on the transparent resin sheet 14 to form a pair. Connecting portions 38 and 40 are formed in a longitudinal shape along the above-mentioned edge. These connections 38 and 4
Reference numeral 0 denotes a conductive layer formed by bonding metal powder such as copper powder, aluminum powder, or silver powder in contact with each other with a resin or the like, and makes conductive sheet 26 and transparent conductive layer 12 conductive respectively. Has been.

FIGS. 4 and 5 are views for explaining a main part of the step of drawing a desired light emitting pattern on the soluble layer 24.
4 and 5 show a transparent resin sheet 14 having a transparent conductive layer 12 laminated on one surface, and an EL light emitting layer 1.
6, an EL display substrate 42 including a resin insulating sheet 18, a permeation layer 22, and a fusible layer 24 is shown. As shown in FIG. 4, the inkjet head 44 of the inkjet printer discharges droplets of the ink 46 according to a command from a computer (not shown), and displays an image corresponding to the light emitting pattern 11 shown in FIG. 1, for example, on the back surface of the EL display substrate 42. The region corresponding to the image in the fusible layer 24 is melted by drawing in FIG. Next, as shown in FIG. 5, the conductive material 48 is applied on the melted region of the soluble layer 24 and reaches the boundary with the transparent resin sheet 14 until the permeation layer 22 is reached.
It penetrates in the thickness direction.

In this way, the conductive sheet 48, the conductive sheet 48, and the conductive sheet 26 are formed on the soluble layer 24.
The transparent resin sheet 14 is formed while the insulating film 34 is laminated.
Of the insulating film 36 on a part of the edge portion of the resin insulating sheet 18 side.
And the conductive sheet 2 on the resin insulation sheet 18 is formed.
4 and the edge portion of the transparent conductive layer 12 on the transparent resin sheet 14 are coated with a conductive paste to form a pair of connection portions 38 and 40, respectively, whereby the EL light emitting device 10 is formed. When configured, the conductive material 48 is brought into close contact with the conductive sheet 26 so as to be electrically connected to the connecting portion 38.

The EL constructed as described above
In the light emitting device 10, an alternating current of about 100 V is applied to the pair of connecting portions 38 and 40, that is, to the transparent conductive layer (transparent electrode) 12 and the back surface electrode layer (back surface electrode) 20 that sandwich the EL light emitting layer 16. When a voltage is applied, the electric field strength is highest between the transparent conductive layer 12 and the conductive material 48 that has penetrated into the permeation layer 22 that is closest to the transparent conductive layer 12. A portion in the vicinity of the material 48 is made to emit light, and locally made to emit light in the dissolved pattern of the fusible layer 24, and the above-described light emitting pattern 11 is obtained. The material, thickness, and the like of the portion of the EL light emitting layer 16 located between the transparent conductive layer 12 and the conductive sheet 26 are set so that the electric field strength enough to generate light emission cannot be obtained.

As described above, the EL light emitting device 1 of this embodiment
No. 0, the transparent resin sheet (surface layer) 14, the EL light emitting layer 16, the insulating layer 18, the permeation layer 22, and the soluble layer 24 were laminated in this order on the EL light emitting substrate 42. , An ink 46 containing a solvent such as an organic solvent,
When the ink is applied in a desired pattern using the ink jet head 44 of an ink jet printer, the soluble layer 24 to which the solvent is attached is locally dissolved to expose the permeation layer 22, so that the permeation layer 22 is exposed. The conductive sheet 2 soaked with the conductive material 48 and laminated on the back surface of the EL light emitting substrate 42 so as to be electrically connected to the conductive material 48.
By applying a voltage between the back surface electrode 20 including 6 and the transparent conductive layer 12, a region of the EL light emitting layer 16 corresponding to the pattern in which the soluble layer 24 is locally dissolved is locally emitted. Therefore, the EL light emitting substrate 42 can easily emit light in a desired light emitting pattern on the user side, and the degree of freedom of expression is further enhanced.

Further, according to this embodiment, the soluble layer 24 is
Since the desired light emission pattern region is locally dissolved by the ink applied by the inkjet printer, it is possible to print the image edited or drawn on the personal computer on the fusible layer 24 by the inkjet printer. Since the melted layer 24 is locally dissolved to expose the permeation layer 22, the permeation layer 22 is impregnated with the conductive material 48 through the holes of the fusible layer 24 opened by the dissolution, and the conductive material is The transparent electrode (transparent electrode) 12 of the back surface electrode 20 and the surface layer 14 including the conductive sheet 26 laminated on the back surface of the EL light emitting substrate 42 so as to be electrically connected to 48.
By applying a voltage between the EL emission layer 16 and
A region corresponding to the pattern in which the soluble layer 24 is locally dissolved is locally emitted.

Further, according to the present embodiment, the conductive material 48
Is permeated into the permeation layer 22 through the dissolution region (opening) formed in the fusible layer 24. Therefore, the applied voltage for display permeates the permeation layer 22 to the insulating layer side. Since the applied voltage is applied between the conductive material 48 and the transparent electrode 12, high quality light emission can be obtained without leakage light emission.

In this embodiment, the ink 46 may be made of a conductive material so that the ink 46 also serves as the conductive material 48. In such a case, the reference numeral 48 in FIGS. 3, 5, and 6 becomes 46.

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment will be designated by the same reference numerals and the description thereof will be omitted.

FIG. 6 is a sectional view of an essential part for explaining the structure of an EL light emitting device 50 of another embodiment of the present invention. This EL light emitting device 50 is
Insulating layer 18 laminated on L light emitting layer 16, soluble layer 24 laminated on permeation layer 22, conductive sheet 26, insulating film 34
And the connecting portion 38 are removed, the permeation layer 22 is adjacent to the EL light emitting layer 16, and the conductive material is permeated into the permeation layer 22 at a plurality of positions so as to obtain a desired light emission pattern. 48 or a connection layer 51 made of a conductive material applied and fixed on the conductive ink 46, and the connection layer 51.
2 is provided with a plurality of connector devices 53 made of a female female connector and a male connector made of metal, which are bonded to each connection layer 51 by a double-sided tape 52 in a conductive state. In the EL light emitting device 50 of the present embodiment, the output voltage of the AC power supply 54 is selectively applied to each of the plurality of connector devices 53 via the switching device 55 at an independent timing, so that the permeation layer 22 of the permeation layer 22 is exposed. A plurality of light emitting patterns corresponding to the conductive material 48 permeated in a plurality of places are caused to emit light at independent timings.

FIG. 7 is a cross-sectional view of an essential part for explaining the structure of an EL light emitting device 56 of another embodiment of the present invention, and FIG. 8 is a perspective view with a part cut away. This EL light emitting device 56
Is an EL light emitting layer 1 as compared with the EL light emitting device 10 described above.
6 is removed, and the fusible layer 24 laminated on the permeation layer 22 is removed, and the permeation layer 22 is replaced by the EL light emitting layer 16.
At a point adjacent to the conductive material 48 that is permeated from one surface of the permeation layer 22 and exposed on one surface of the permeation layer 22 so that a desired light emission pattern can be obtained. The difference is that a conductive grid layer 58 is provided in place of the conductive sheet 26 for performing the above. The insulating layer 18 is for enhancing the insulating property of the EL light emitting layer 16, but since it lowers the emission brightness,
In this embodiment, it is removed in order to give priority to the light emission brightness.

The conductive grid layer 58 corresponds to the conductive mesh pattern and is, for example, 0.1 to 0.3.
A net-like pattern having a line width dimension of about a stripe, a lattice, a honeycomb, etc., which is fixed on the permeation layer 22 by screen-printing and drying a conductive paste or a conductive adhesive. It is protected by the insulating film 34 laminated or pressure-bonded thereon, and at the same time, it is brought into contact with the connecting portion 38 to be electrically connected. EL above
The permeation layer 22 laminated so as to be adjacent to the light emitting layer 16 is
The EL is preferably attached via an adhesive with relatively low adhesion.
It can be peeled off by being adhered onto the light emitting layer 16, and the used permeation layer 22 can be discarded and replaced with a new permeation layer 22.

The EL light emitting device 56 constructed as described above.
Then, the transparent resin sheet (surface layer) 14 and the EL light emitting layer 1
6, E that the permeation layer 22, and the conductive grid layer 58 are sequentially laminated
In the L light-emitting substrate 42, or in the permeation layer 22 and the conductive grid layer 58 that are stacked on each other, a conductive ink containing a solvent such as water, alcohol, or an organic solvent is formed on the surface of the conductive grid layer 58 side. 46),
When the ink is applied in a desired pattern using the ink jet head 44 or a brush of an ink jet printer, the conductive ink 46 permeates the permeation layer 22 in the thickness direction, and at the same time, is electrically connected to the conductive grid layer 58.
By applying a voltage between the connecting portion 38 that is conductive with the conductive material 48 and the connecting portion 40 that is conductive with the transparent conductive layer 12, the conductive ink 4 of the EL light emitting layer 16 is formed.
Since 6 is locally permeated into the permeation layer 22 and the region corresponding to the pattern brought into proximity is locally emitted,
On the user side, that is, on the transparent resin sheet (surface layer) 14 side, the EL light emitting substrate 42 can easily emit light in a desired light emitting pattern, and the degree of freedom of expression is further enhanced.

In FIG. 7, an aluminum foil is provided as a conductive layer instead of the transparent conductive layer 12 and the insulating film 34 is removed, or it may be made of a transparent material such as a transparent sheet. . In such a case, the liquid conductive material, that is, the conductive ink 46 needs to be translucent. However, the light emission pattern is displayed on the conductive grid layer 58 side, and The application pattern of the ink 46 and the light emission pattern are not inverted and are displayed in agreement. Further, since the conductor layer 12 laminated on the other surface of the EL light emitting layer 16 is made of an inexpensive aluminum foil, the display device 56 becomes inexpensive.

FIG. 9 is a cross-sectional view of essential parts for explaining the structure of an EL light emitting device 60 of another embodiment of the present invention. The EL light emitting device 60 of this embodiment has a height of several mm or less, preferably about 0.5 to 1.5 mm, in order to hold the applied conductive material 48 in place of the permeation layer 22. In addition, a large number of parallel elongated ridges 62 are arranged at a predetermined interval.
6 is provided with a rib layer 64 projecting from the side opposite to the EL light emitting layer 16 side, and a conductive sheet 26 or a conductive sheet for applying a voltage to the locally applied conductive material 48. The difference is that instead of the child layer 58, a conductive layer 68 that is applied to the rib layer 64 and is conducted to the conductive ink 46 held by the ridges 62 is provided. The conductive layer 68 may be in the form of a flat sheet, but as shown in FIG. 9, it is preferable that the conductive layer 68 be provided so as to protrude from the insulating film 34 and have a connecting portion in order to increase contact pressure and maintain reliability. 38, which are parallel to each other and are connected to the projection
It is composed of the conductive ridges 66 that are orthogonal to. The rib layer 64 functions as a conductive material holding sheet,
In order to replace a used one with a new one, it is removably attached to the EL light emitting layer 16. The rib layer 64
The ridges 62 of the EL light emitting layer 16 are formed by screen-printing and drying an insulating material paste or an adhesive made of a resin containing an inorganic filler, for example.
It is fixed on the top. The conductive ridges 66 of the conductive layer 68 are fixed to the insulating film 34 by, for example, screen printing and drying a conductive paste or a conductive adhesive.

The ridges 62 forming the rib layer 64 are for holding the locally applied conductive material 48, and have various shapes such as stripes, grids, short lines, and honeycombs. Composed of. In addition, the conductive layer 68
Is composed of conductive ridges 66 in stripes, grids or the like for contacting the locally applied conductive ink 46 and applying a voltage. Thus, it may be composed of a sheet-shaped conductor.

The EL light emitting device 60 constructed as described above.
Then, the transparent resin sheet (surface layer) 14 and the EL light emitting layer 1
6. In the EL light emitting substrate 42 in which the rib layer 64 is sequentially laminated, the conductive ink (transparent) 46 containing a solvent such as water or an organic solvent is provided on the surface of the rib layer 64 side, and the inkjet head of the inkjet printer. When it is attached in a desired pattern with 44 or a brush, the conductive ink 46 is held by the fine ridges 62, and
When the conductive ridges 66 of the conductive layer 68 are laminated thereon, the conductive ridges 64 are brought into contact with the conductive ridges 64 for electrical conduction, so that the conductive ridges 66 of the conductive layer 68 are connected to the connecting portions 38. A pattern in which the conductive ink 46 of the EL light emitting layer 16 is locally held by the rib layer 64 and brought close to the rib layer 64 by applying a voltage between the transparent conductive layer 12 and the connecting portion 40 which is in conduction. Since the region corresponding to is locally lit, the EL luminescent substrate 42 can easily illuminate with a desired luminescent pattern on the user side, and the degree of freedom of expression is further enhanced.

FIG. 10 is a cross-sectional view of essential parts for explaining the structure of an EL light emitting device 70 of another embodiment of the present invention. The EL light emitting device 70 of the present embodiment is different from the EL light emitting device 60 in that the insulating film 34 and the conductive layer 68 are removed, and instead, a linear conductive layer 72 is formed at the tip of the ridge 62. The difference is that it is the same as the others. The linear conductive layer 72 is applied to the surface of the rib layer 64 side and is held by the ridges 62 of the conductive ink 4.
6 is made of a material similar to that of the conductive layer 68 in a linear shape at the tip of the ridge 62.
To connect the connection part 38 with the connection part 38 electrically.
It has an end portion at a position where it can come into contact with. Also in the present embodiment, the same operational effects as the EL light emitting device 60 can be obtained.

Although one embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other modes.

For example, in the above-described embodiment, the soluble layer 24 is locally dissolved by the ink 46 ejected from the ink jet head 44, but the soluble layer 24 is applied using a writing instrument. A desired emission pattern region may be locally dissolved by the generated solvent. By doing so, when an image is drawn on the soluble layer 24 using a writing instrument such as a brush, the soluble layer 24 is locally dissolved and the permeation layer 22 is exposed. The conductive ink 46 is soaked in 22 with a brush or the like so that the conductive ink 46 and the conductive ink 46 are electrically connected.
By applying a voltage between the back surface electrode 20 including the conductive sheet 26 laminated on the back surface of the L light emitting substrate 42 and the transparent electrode 12 of the surface layer 14, the soluble layer 24 of the EL light emitting layer 16 is locally formed. The region corresponding to the chemically dissolved pattern is locally illuminated. That is, the desired light emission pattern 1
1 can be easily created by the user's operation, and the degree of freedom of expression is further enhanced.

Further, in the above-described embodiment, the EL light emitting device 10 is rectangular and the edges thereof are straight, but the EL light emitting device 10 is circular or elliptical and the edges thereof are curved. Good.

The insulating sheet 18 of the above-mentioned embodiment is
For electrically protecting the EL light emitting layer 16,
If the thickness is increased, the withstand voltage is increased but the display luminance is decreased, and the insulating sheet 18 may not necessarily be provided within a range in which the quality of the display device can be maintained. E for example
In the L light emitting device 10, the insulating sheet 18 may be removed. For example, in the EL light emitting device 56 of FIG. 7, the insulating sheet 18 may be provided on the 12 side of the EL light emitting layer 16.
Further, in the EL light emitting device 10, the surface layer 14 and the transparent electrode 12
The stacking order of and may be reversed.

In the above-described embodiment, the EL light emitting device 1 is used to form a desired light emitting pattern on the user side.
The EL light-emitting substrate 42, or the permeation layer (conductive material holding sheet) 22 and the rib layer (conductive material holding sheet) 64, which form a part of 0, can be replaced by themselves and are therefore distributed independently as consumables. It can be sold.

Further, in the embodiment of FIG. 6, the permeation layer 22
The voltage is applied to the conductive material 48 permeated by the connector device 53 by fixing the connector device 53 with the double-sided tape 52 on the connection layer 51 coated on the conductive ink 46. However, other connection methods such as connecting lead wires using a conductive adhesive may be adopted.

Further, the protrusion 62 in FIG. 9 may have a rod shape, or may have a triangular, trapezoidal, or inverted trapezoidal sectional shape. Further, a sheet in which a large number of rectangular holes and round holes are formed can also be used as the rib layer (conductive material holding sheet) 64. This is because the cross-sectional shape has a function of holding the applied fluid conductive material 48 having a substantially large number of protrusions.

The above description is merely an embodiment of the present invention, and the present invention can be modified in various ways without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram showing a front surface of an EL light emitting device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of the back surface of the EL light emitting device of FIG.

FIG. 3 is a partial cross-sectional view illustrating a main part of the EL light emitting device of FIG.

FIG. 4 is a view showing a manufacturing process of the EL light emitting device of FIG. 1 in which an inkjet head is used on the fusible layer 24 on the back surface of the EL light emitting substrate to provide a desired light emitting pattern. FIG. 7 is a diagram illustrating a state in which ink is applied so that a desired image is formed.

FIG. 5 illustrates a step of impregnating a conductive material through an opening formed by locally dissolving ink by forming an image corresponding to a desired light emission pattern on the soluble layer 24. FIG.

FIG. 6 is a cross-sectional view of an essential part for explaining the configuration of an EL light emitting device of another embodiment of the present invention, which is a view corresponding to FIG. 3.

7 is a cross-sectional view of an essential part for explaining the configuration of an EL light emitting device of another embodiment of the present invention, which is a view corresponding to FIG.

FIG. 8 is a partially cutaway perspective view illustrating a configuration of the EL light emitting device of FIG.

9 is a cross-sectional view of an essential part for explaining the configuration of an EL light emitting device of another embodiment of the present invention, which is a view corresponding to FIG. 3. FIG.

10 is a cross-sectional view of an essential part for explaining the configuration of an EL light emitting device of another embodiment of the present invention, which is a view corresponding to FIG. 3. FIG.

[Explanation of symbols]

10: EL light emitting device 12: Transparent conductive layer (transparent electrode) 14: Transparent resin sheet (surface layer) 16: EL light emitting layer 20: Back electrode layer (back electrode) 22: Permeation layer (conductive material holding sheet) 24: Soluble sheet (soluble layer) 42: EL light emitting substrate 46: Ink (fluid conductive material) 48: Conductive material (conductive coating layer) 50, 56, 60, 70: EL light emitting device 64: Rib layer (conductive material holding sheet)

Claims (12)

[Claims] 1. An EL light-emitting device comprising an EL light-emitting layer having an EL light-emitting body, which is laminated on one surface of the EL light-emitting layer and corresponds to the light-emitting pattern in order to cause the EL light-emitting layer to emit light in a desired light-emitting pattern. A conductive material holding sheet for holding the conductive material in a pattern, which is composed of an absorbent for absorbing the applied liquid conductive material, and the liquid conductive material permeates at least in the thickness direction. E, characterized in that it is held in a forced state
A conductive material holding sheet used for an L light emitting device. 2. The conductive material holding sheet according to claim 1, wherein the conductive material holding sheet has a soluble layer locally dissolved by a liquid conductive material on a side opposite to the EL light emitting layer. Sheet. 3. An EL light emitting device capable of emitting light in a desired light emission pattern using the conductive material holding sheet according to claim 2, wherein the conductive material holding sheet is provided on a side opposite to the EL light emitting layer. A plurality of conductive coating layers that are locally coated so as to be conductive with the liquid conductive material that has permeated the conductive material holding sheet, and a conductor laminated on the other surface of the EL light emitting layer Corresponding to the pattern of the liquid conductive material permeated into the conductive material holding sheet by applying a driving voltage between the plurality of conductive coating layers and the conductive layer. E, the portions of the pattern corresponding to the plurality of conductive coating layers emit light at independent timings.
L light emitting device. 4. The conductor layer laminated on the other surface of the EL light emitting layer is made of a transparent conductive material laminated on a transparent sheet, and the transparent conductive layer is formed on the other surface side of the EL light emitting layer. The EL light-emitting device according to claim 3, which emits light through a material. 5. The conductive material holding sheet according to claim 1, wherein the conductive material holding sheet is provided with a conductive mesh pattern in which a conductive paste is fixed to the surface in a mesh pattern on the side opposite to the EL light emitting layer. Material holding sheet. 6. An EL light emitting device capable of emitting light in a desired light emitting pattern using the conductive material holding sheet according to claim 5, wherein the EL light emitting device has a conductive mesh pattern and is laminated on one surface of the EL light emitting layer. A conductive material holding sheet and a conductive layer laminated on the other surface of the EL light-emitting layer, and a drive voltage is applied between the conductive net-like pattern and the conductive layer to form the conductive material. An EL light-emitting device, which emits light in a pattern corresponding to the pattern of a liquid conductive material that has permeated a holding sheet. 7. The conductor layer laminated on the other surface of the EL light emitting layer is made of an aluminum foil, and emits light from the one surface side of the EL light emitting layer through the conductive mesh pattern. The EL light emitting device according to claim 6. 8. The conductor layer laminated on the other surface of the EL light emitting layer is made of a transparent conductive material laminated on a transparent sheet, and the transparent conductive layer is formed on the other surface side of the EL light emitting layer. The EL light-emitting device according to claim 6, which emits light through a material. 9. The liquid conductive material is locally permeated into the conductive material holding sheet with a desired light emission pattern by a brush or an inkjet printer, according to claim 3, 4, 6, or 8. Any EL light emitting device. 10. In an EL light emitting device including an EL light emitting layer having an EL light emitting body, the EL light emitting layer is laminated on one surface of the EL light emitting layer and corresponds to the light emitting pattern so that the EL light emitting layer emits light in a desired light emitting pattern. A conductive material holding sheet for holding a conductive material in a pattern to be formed, comprising a large number of protrusions protruding to the side opposite to the EL light emitting layer, and the applied liquid conductive material is applied. A conductive material holding sheet used for an EL light emitting device, which is held in a pattern. 11. The plurality of protrusions are elongated ridges that are parallel to each other, and a linear conductive layer for establishing electrical connection with the applied liquid conductive material is provided at a tip end of the ridge. The conductive material holding sheet according to claim 10, which is provided. 12. An EL light emitting device capable of emitting light in a desired light emitting pattern using the conductive material holding sheet according to claim 11, wherein the conductive material holding sheet is laminated on one surface of the EL light emitting layer. A linear conductive layer provided at the tip of the strip and a conductive layer laminated on the other surface of the EL light emitting layer, and a drive voltage is applied between the linear conductive layer and the conductive layer. Thus, the EL light emitting device is characterized in that it emits light in a pattern corresponding to the pattern of the liquid conductive material held by the conductive material holding sheet.