JPH06223969A - Organic dispersion type el panel - Google Patents

Abstract

PURPOSE:To provide an organic dispersion type EL panel provided with a power feed section having low resistance and allowing a transparent electrode to be uniformly applied with voltage. CONSTITUTION:A transparent electrode layer 14 is integrally laminated and arranged on one principal plane of a phosphor layer 11 dispersively containing phosphor grains. A transparent electrode power feed section 15 is arranged between the phosphor layer 11 and the transparent electrode layer 14, and the first lead 18 is provided on the power feed section 15. The transparent electrode power feed section 15 is constituted of a metal foil 16 arranged on the phosphor layer 11 side and a metal paste coat layer 17 arranged on the transparent electrode layer 14 side in a two-layer structure. A back electrode layer 13 is laminated and arranged on the other principal plane of the phosphor layer 1 via a reflecting insulation layer 12 to constitute an organic dispersion type EL panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic dispersion type EL (electroluminescence) panel which can be used in a large area.

[0002]

2. Description of the Related Art An organic dispersion type EL panel has been attracting attention as a surface light emitter which is lightweight, thin and has a high degree of freedom in shape, and is widely used as a liquid crystal backlight or a charge eliminating light source for a dry copying machine. It is starting.

In a conventional organic dispersion type EL panel, as shown in FIG. 3, for example, a phosphor such as ZnS, which becomes a light emitting layer 3 through a reflective insulating layer 2 on an Al foil which becomes a back electrode 1, is formed. A coating layer of a paste in which particles are dispersed in an organic polymer is provided, and the light emitting layer 3 and a transparent electrode sheet 4 in which a transparent electrode such as an ITO vapor deposition film is formed on a transparent insulating film are integrated. Have

Further, a transparent electrode sheet 4 having an ITO film or the like
In order to apply a voltage evenly to the transparent electrode sheet 4, an Ag paste coating layer 5 or the like is provided as a power supply section on the transparent electrode sheet 4, and leads 6 for external extraction are provided on the power supply section 5. There is. Similarly, the back electrode 1 is also provided with a lead 7 for external drawing.

By the way, recently, display panels, landscape lighting,
Surface emitting sources are used for traffic signs and the like, and accordingly, large-area EL panels are required. However, in increasing the size of the EL panel, the conventional EL panel structure described above has the following problems.

That is, when the area of the EL panel is increased,
The length of the power supply part for the transparent electrode is naturally long, but when the power supply part is composed of the coating layer 5 of Ag paste as described above,
The coating layer 5 of the Ag paste has a large resistance, and the longer the power supply section is, the larger the resistance is, and therefore the power supply section may be partially burnt out. In addition, since it is necessary to flow a larger current through the power supply section for an EL panel having a larger area, in the power supply section including the Ag paste coating layer 5 having a high resistance, the contact portion between the lead 6 and the power supply section 5, the transparent electrode 4, and the like. The contact portion with the power supplying unit 5, the power supplying unit 5 itself, and the ITO film may generate heat, which may cause a short circuit or the like.

For this reason, when the Ag paste coating layer 5 or the like is used as the power supply section, the coating thickness should be thickened or the coating width should be wide, and a paste having high conductivity should be used. However, the sufficient effect has not been obtained, which is an obstacle to increasing the area of the EL panel.

On the other hand, as shown in FIG.
Although it has been attempted to use a metal foil 8 such as a copper foil (10 ^-6 Ω / cm or less) whose resistance is smaller than that of the Ag paste coating layer (10 ² to 10 ³ Ω / □), the ITO vapor deposition film Since the surface has irregularities, the contact between the metal foil 8 and the ITO vapor deposition film is likely to be a point contact, and there is a high possibility that a short circuit will occur due to partial voltage application. Further, when the light emitting layer 3 and the transparent electrode sheet 4 are thermocompression bonded, the ITO vapor deposition film may be divided.

[0009]

As described above, the EL panel has recently been required to have a larger size. However, in the power supply section structure of the conventional organic dispersion type EL panel, the Ag paste coating layer is used. In the thing, there is a high possibility that the power supply section will be cut or short-circuited, and if a metal foil is used, the power supply section itself can be made to have a low resistance, but a short circuit may occur due to partial voltage application, There was a problem such as dividing the ITO vapor deposition film during manufacturing.

The present invention has been made in order to address such a problem, and makes it possible to reduce the resistance of the power supply section and evenly apply a voltage to the transparent electrode, and to make the EL panel have a large area, for example. It is an object of the present invention to provide an organic dispersion-type EL panel that can obtain stable quality even when the organic EL panel is changed.

[0011]

Means for Solving the Problems Organic dispersion type EL of the present invention
The panel has a luminescent layer containing phosphor particles dispersed therein, a transparent electrode layer integrally arranged to face one main surface of the luminescent layer, and a transparent layer disposed between the luminescent layer and the transparent electrode layer. An electrode power supply section, a first lead attached to the transparent electrode power supply section, a back electrode layer laminated on the other main surface of the light emitting layer via a reflective insulating layer, and the back surface. Organic dispersion type E having a second lead attached to the electrode layer
In the L panel, the transparent electrode power supply unit has a two-layer structure of a metal foil arranged on the light emitter layer side and a metal paste coating layer arranged on the transparent electrode layer side. There is.

[0012]

In the organic dispersion type EL panel of the present invention, the power supply part for the transparent electrode is composed of the metal foil and the coating layer of the metal paste.
It has a layered structure. The metal foil of the power supply section having the two-layer structure can minimize the electric resistance of the power supply section. In addition, since the coating layer of the metal paste is placed on the transparent electrode side made of ITO vapor deposition film, this coating layer keeps the contact between the metal foil and the transparent electrode in good condition, and the transparent electrode is not damaged during manufacturing. Can be prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show the organic dispersion type E of the present invention.
It is a figure which each shows the structure of one Example of L panel. In these figures, numeral 11 is a light emitting layer in which phosphor particles such as ZnS are dispersed and contained in an organic polymer having a high dielectric constant such as cyanoethyl cellulose. On one main surface of the light emitting layer 11, a reflective insulating layer in which a highly reflective inorganic oxide powder such as TiO ₂ or BaTiO ₃ is dispersed and contained in an organic polymer having a high dielectric constant such as cyanoethyl cellulose. 12 are laminated, and a back electrode layer 13 made of, for example, a metal foil such as Al or a metal film is integrally provided via the reflective insulating layer 12.

On the other main surface of the light emitting layer 11,
A transparent electrode layer (transparent electrode sheet) 14 formed by depositing an ITO film or the like on a transparent film such as a polyester film is laminated. The ITO film (not shown) is arranged to face the light emitting layer 11. Then, on the surface of the light emitting body layer 11 facing the transparent electrode layer 14, the power supply portion 15 for the transparent electrode is provided. This transparent electrode power supply unit 15 is
It has a two-layer structure of a metal foil 16 such as Cu foil or Al foil and a coating layer 17 of a metal paste such as Ag paste. Specifically, the metal foil 16 is arranged on the light emitting layer 11 side, and the metal paste coating layer 17 is formed on the metal foil 16. The metal foil 16 is adhered to the light emitting layer 11 with an adhesive, for example. An insulating adhesive is preferably used as this adhesive.

A first lead 19 for a transparent electrode is attached to the transparent electrode power supply section 15 described above. In addition, the second lead 20 is attached to the back electrode layer 13.

Outside the back electrode layer 13 and the transparent electrode layer 14, a water-absorbent film (not shown) is integrally provided as a moisture-proof measure for the light-emitting body layer 11, and is sandwiched from the outside. , A transparent packaging film (not shown) having a low water-moisture permeability, such as a polychlorotrifluoroethylene film, is arranged. Then, the protruding portions of these packaging films are thermocompression-bonded and sealed to form an organic dispersion type EL panel.

The organic dispersion type EL panel having the above structure is manufactured, for example, as follows.

First, the reflective insulating layer 12 and the light emitting layer 11 are dispersed on an Al foil which will be the back electrode layer 13, for example, by dispersing the respective pastes (inorganic oxide powder or phosphor particles in a cyanoethyl organic binder or the like). Stuff) in order,
A layer is formed by drying.

Next, an adhesive layer is provided on one surface of the metal foil 16 such as a copper foil having a thickness of about 30 μm, and a metal paste such as Ag paste is applied on the other surface at a thickness of about 10 μm, A metal paste coating layer 17 is formed. Metal foil 16 provided with this adhesive layer and metal paste coating layer 17
After cutting into the required size, the luminous body layer 1 is formed by the adhesive layer.
The transparent electrode power supply part 15 is formed by pasting on 1. In addition, on the transparent electrode power supply unit 15, the first transparent electrode
The lead 18 is attached (temporarily fixed).

On the other hand, an ITO film or the like is deposited on the transparent film to form a transparent electrode layer (transparent electrode sheet) 14. Then, the transparent electrode sheet 14 and the luminous body layer 11
Al foil 13 formed by laminating etc., ITO film and light emitter layer 11
And facing each other, and laying the water-absorbing film and the packaging film on the outside of them respectively, and then passing between the thermocompression-bonding rollers, and sealing the protruding part of the packaging film by thermocompression-bonding. Thus, an organic dispersion type EL panel is manufactured.

In the organic dispersion type EL panel of this embodiment, since the transparent electrode power supply part 15 has a two-layer structure of the metal foil 16 and the metal paste coating layer 17, the power supply part 1
The electric resistance of No. 5 can be minimized by the metal foil 16. In addition, the ITO vapor deposition film and the metal foil 16 that will become the transparent electrodes
Since the coating layer 17 of the metal paste is disposed between and, the metal foil 16 and the transparent electrode can be brought into uniform contact with each other, and a short circuit due to point contact can be prevented. Further, since the metal paste coating layer 17 can provide appropriate elasticity between the metal foil 16 and the transparent electrode, the Al foil 1 in which the transparent electrode sheet 14 and the light emitting layer 11 are laminated and formed.
It is possible to prevent the transparent electrode made of the ITO vapor deposition film or the like from being damaged when thermocompression-bonding the 3 and 3.

As a result, even when the organic dispersion type EL panel has a large area, that is, when the power supply section is long and a large current needs to flow through the power supply section, the power supply section burns out or generates heat. It is possible to effectively prevent the occurrence of a short circuit, and it is possible to uniformly apply a voltage to the transparent electrode. Therefore, it is possible to impart stable quality and operation characteristics to the organic dispersion type EL panel having a large area.

Further, specifically, when a large organic dispersion type EL panel having a size of 50 × 30 cm was manufactured according to the above-mentioned constitution and manufacturing method, stable lighting characteristics were obtained without causing burnout or short circuit of the power supply section. I was able to get

[0025]

As described above, according to the present invention, it is possible to evenly apply a voltage to the transparent electrode while reducing the electric resistance of the power supplying section, so that the quality is stabilized. It is possible to provide an organic dispersion type EL panel having a large area.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing a main configuration of an organic dispersion type EL panel according to an embodiment of the present invention.

FIG. 2 is a view showing a cross section of the organic dispersion type EL panel shown in FIG.

FIG. 3 is a cross-sectional view showing a configuration of a main part of a conventional organic dispersion type EL panel.

FIG. 4 is a cross-sectional view showing a main part configuration of another conventional organic dispersion-type EL panel.

[Explanation of symbols]

 11 ... Light emitter layer 12 ... Reflective insulating layer 13 ... Back electrode layer 14 ... Transparent electrode layer 15 ... Transparent electrode power supply section 16 ... Metal foil 17 ... Metal paste coating layer 18 ... First Lead 19 ... Second Lead

Claims (2)

[Claims] 1. A phosphor layer containing phosphor particles dispersed therein,
A transparent electrode layer integrally arranged to face one main surface of the light emitting layer, a transparent electrode power supply section disposed between the light emitting layer and the transparent electrode layer, and a transparent electrode power supply section. An organic material including a first lead, a back electrode layer laminated on the other main surface of the light emitting layer through a reflective insulating layer, and a second lead attached to the back electrode layer. In the dispersion type EL panel, the transparent electrode power supply unit has a two-layer structure of a metal foil disposed on the light emitter layer side and a metal paste coating layer disposed on the transparent electrode layer side. Characteristic organic dispersion type EL panel. 2. The organic dispersion type EL panel according to claim 1, wherein the metal foil is adhered to the light emitting layer through an insulating adhesive layer.