JP2000021565A - Electroluminescence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electroluminescence capable of avoiding a current-carrying failure and executing uniform light emission. SOLUTION: A transparent electrode 2 formed by functionally dividing it into a display electrode 21 and a wiring electrode 23 is formed on a transparent substrate 1. One or more insulation layers 4 which are intermediate layers and a luminescent layer 5 are sequentially formed on the transparent electrode 2. A back electrode 6 facing to the display electrode 21 is formed on the luminescent layer 5. Multiple terminals 24 connected to the back electrode 6 are formed on the peripheral part of the transparent substrate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent electrode having a display electrode formed of a plurality of segments of a specific shape for expressing an arbitrary shape by selective light emission made of a transparent conductive material, and a transparent electrode opposed thereto. The present invention relates to electroluminescence in which a light emitting layer is interposed between back electrodes.

[0002]

2. Description of the Related Art A transparent electrode formed on a transparent substrate so as to be functionally separated into a display electrode and a wiring electrode, an insulating layer made of a dielectric material as an intermediate layer, a light emitting layer, and at least a back electrode facing the transparent electrode. , And so-called thin film electroluminescence is disclosed in, for example, Japanese Patent No. 2758785.

In such electroluminescence, a fluorescent substance, which is a luminescent center in a light emitting layer, is excited by applying an AC voltage of several hundred volts between a transparent electrode and a back electrode, and the excited fluorescent light is emitted. The substance emits light when the substance returns to the ground state.

[0004]

Generally, such a back electrode for electroluminescence is formed of a thin film of a metal conductive material such as aluminum (Al). Similarly, a terminal is drawn out to the peripheral portion on the transparent substrate.

However, since only one terminal of the back electrode is usually provided, if a break occurs between the terminal and the back electrode, no voltage is applied between the transparent electrode and the back electrode. However, there is a problem that the electroluminescence does not emit light.

[0006]

According to the present invention, there is provided a transparent electrode formed on a transparent substrate and having a function separated into a display electrode and a wiring electrode. Forming at least one intermediate layer and a light-emitting layer sequentially,
Electroluminescence in which a back electrode is formed on the light emitting layer so as to face the display electrode, and a plurality of terminals extending from the back electrode are provided.

Further, the present invention provides a method for forming a transparent electrode formed on a transparent substrate by separating the display electrode and the wiring electrode into functions.
At least one intermediate layer and a light-emitting layer are sequentially formed on the transparent electrode, and a back electrode is formed on the light-emitting layer so as to face the display electrode. In this case, a plurality of terminals are provided so as to be located at diagonal positions in the formation range of the back electrode.

According to the present invention, there is further provided a transparent electrode which is formed on a transparent substrate so as to be functionally separated into a display electrode and a wiring electrode,
Electroluminescence in which at least one intermediate layer and a light emitting layer are sequentially formed on the transparent electrode, and a back electrode is formed on the light emitting layer so as to face the display electrode. It has a substantially square shape and is provided with four terminals extending from the back electrode so as to be located at each corner of the back electrode.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transparent electrode 2 is formed on a transparent substrate 1 so as to be functionally separated into a display electrode 21 and a wiring electrode 23, and on this transparent electrode 2, at least one insulating layer as an intermediate layer is formed. A layer 4 and a light-emitting layer 5 are sequentially formed, and a plurality of terminals 24 connected to the back electrode 6 are provided on the light-emitting layer 5 by electroluminescence in which the back electrode 6 is formed so as to face the display electrode 21.

Thus, even if a disconnection occurs between any one of the terminals 24 and the back electrode 6, the conduction from the other terminal 24 to the back electrode 6 is ensured, so that electroluminescence is emitted.

A display electrode 21 and a wiring electrode 2 are provided on a transparent substrate 1.
3, a transparent electrode 2 formed so as to be functionally separated from the transparent electrode 2, an insulating layer 4 as an intermediate layer and a light emitting layer 5 are sequentially formed on the transparent electrode 2, and on the light emitting layer 5, In the electroluminescence in which the back electrode 6 is formed so as to face the display electrode 21, a plurality of terminals 24 connected to the back electrode 6 are provided so as to be located at diagonal positions in the formation range of the back electrode 6.

As a result, even if a disconnection occurs between any of the terminals 24 and the back electrode 6, the conduction from the other terminals 24 to the back electrode 6 is ensured, so that electroluminescence is emitted. Then, since the voltage is supplied to the back electrode 6 from the position where the distance is farthest in the formation range of the back electrode 6, a voltage difference in the formation range of the back electrode 6 hardly occurs.

A display electrode 21 and a wiring electrode 2 are provided on a transparent substrate 1.
3, a transparent electrode 2 formed so as to be functionally separated from the transparent electrode 2, an insulating layer 4 as an intermediate layer and a light emitting layer 5 are sequentially formed on the transparent electrode 2, and on the light emitting layer 5, Electroluminescence in which the back electrode 6 is formed so as to face the display electrode 21, wherein the back electrode 6 has a substantially square shape, and terminals 24 connected to the back electrode 6 are located at each corner of the back electrode 6. Four are provided.

As a result, even if a disconnection occurs between any of the terminals 24 and the back electrode 6, the conduction from the other terminals 24 to the back electrode 6 is ensured, so that electroluminescence is emitted. Then, since voltage is supplied to the back electrode 6 from each corner of the formation area of the substantially square back electrode 6, a voltage difference in the formation area of the back electrode 6 hardly occurs.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiments shown in the accompanying drawings.

1 and 2 relate to a first embodiment of the present invention, wherein 1 is a transparent substrate such as soda glass which has been degreased and washed;
Reference numeral 2 denotes a display electrode 2 made of a transparent conductive material such as ITO formed on a transparent substrate 1 and formed in a plurality of segments of a specific shape in order to express an arbitrary shape by selective light emission.
1 and a terminal 22 drawn out to the peripheral side of the transparent substrate 1
And a wiring electrode 23 connecting the terminal 22 from the display electrode 21 and a transparent electrode formed with a terminal 24 for a back electrode to be described later, and 3 is a transparent electrode 2 formed on the wiring electrode 23. Chromium (C
r), an auxiliary electrode made of a metal conductive material such as r), an insulating layer 4 serving as an intermediate layer made of a dielectric material such as alumina or silicon nitride formed on the transparent electrode 2 excluding the display electrode 21 and the terminal 22; A light-emitting layer 6 composed of a light-emitting material of zinc sulfide as a base material and manganese as a light-emitting center formed on the electrode 21 and the insulating layer 4 is located on the light-emitting layer 5 and the display electrode 2
Aluminum (Al) formed so as to face 1
A part of the back electrode 6 is drawn out to the peripheral side of the transparent substrate 1 like the transparent electrode 2 and is connected to the terminal 24.

The terminal 24 need not be provided when a part of the back electrode 6 is directly extended to the periphery of the transparent substrate 1 and a power source is connected thereto.

The laminated body of the transparent electrode 2 to the back electrode 6 is sequentially formed by an appropriate method such as vapor deposition or sputtering.

Reference numeral 7 denotes a sealing member made of a material similar to that of the transparent substrate 1 adhered and fixed to the transparent substrate 1, and has a concave portion at the center to store the insulating protective liquid 8. The insulating protective liquid 8 was previously injected into a concave portion of the sealing member 7 using a tool such as a dispenser, and then the transparent substrate 1 on which the transparent electrode 2 to the back electrode 6 were formed was provided with an adhesive 9. The sealing is carried out by injecting into the concave portion by fixing to the sealing member 7, or after the sealing member 7 provided with the adhesive is fixed to the transparent substrate 1 on which the transparent electrode 2 to the back electrode 6 are formed, and then sealed. It is formed by a method such as injecting the insulating protection liquid 8 into the recess from the injection port 10 prepared in the stop member 7.

Thus, the electroluminescence can be obtained by providing the auxiliary electrode 3 made of a metal conductive material such as chromium having a lower resistivity than the wiring electrode 23 formed on the wiring electrode 2, and Since a voltage drop in the wiring electrode 23 located halfway to the display electrode 21 can be suppressed, uneven light emission caused by a difference in the distance between the wiring electrodes 23 can be improved, and the appearance can be improved.

A terminal 24 for supplying a voltage to the back electrode 6
Like the terminal 22 connected to the transparent electrode 2, the terminal 22 is formed so as to be located at a peripheral portion on the transparent substrate 1.
A total of six are provided alternately with two.

As a result, even if a disconnection occurs between any of the terminals 24 and the back electrode 6, the conduction from the other terminals 24 to the back electrode 6 is ensured. Defects can be avoided.

For this purpose, it is desirable to form many terminals 24, but the area of the transparent substrate 1 is limited, and the number is determined in relation to the terminals 22, but it is sufficient if at least two terminals are provided.

FIG. 2 is a view of the electroluminescence as viewed from the back electrode 6 side (that is, the back side). A terminal 22 forming a part of the transparent electrode 2 is connected to a wiring electrode 23 connected to the same. Are omitted, and the same applies to FIGS. 3 and 4 below.

FIG. 3 shows another example relating to the formation of the terminal 24, in which the display electrode 21 and the wiring electrode 2 are formed on the transparent substrate 1.
3, a transparent electrode 2 formed so as to be functionally separated from the transparent electrode 2, an insulating layer 4 as an intermediate layer and a light emitting layer 5 are sequentially formed on the transparent electrode 2, and on the light emitting layer 5, In the electroluminescence in which the back electrode 6 is formed so as to face the display electrode 21, a plurality of terminals 24 connected to the back electrode 6 are provided so as to be located at diagonal positions in the formation range of the back electrode 6. In this case, the “diagonal location” is synonymous with the “distant location”.

As a result, even if a disconnection occurs between any of the terminals 24 and the back electrode 6, the electroluminescence is emitted because the conduction from the other terminals 24 to the back electrode 6 is ensured. Then, since the voltage is supplied to the back electrode 6 from the position where the distance is farthest in the formation range of the back electrode 6, a voltage difference in the formation range of the back electrode 6 hardly occurs.

That is, each point on the back electrode 6 has a potential difference due to the effect of the voltage drop in proportion to the distance from the terminal 24. With a configuration in which a voltage is supplied to the electrode 6, the voltage drop can be suppressed and light emission can be performed uniformly.

FIG. 4 shows another example of the formation of the terminal 24, in which the display electrode 21 and the wiring electrode 2 are formed on the transparent substrate 1.
3, a transparent electrode 2 formed so as to be functionally separated from the transparent electrode 2, an insulating layer 4 as an intermediate layer and a light emitting layer 5 are sequentially formed on the transparent electrode 2, and on the light emitting layer 5, Electroluminescence in which the back electrode 6 is formed so as to face the display electrode 21, wherein the back electrode 6 has a substantially square shape, and terminals 24 connected to the back electrode 6 are located at each corner of the back electrode 6. Four are provided.

As a result, even if a disconnection occurs between any of the terminals 24 and the back electrode 6, the conduction from the other terminals 24 to the back electrode 6 is ensured, so that electroluminescence is emitted. Then, since voltage is supplied to the back electrode 6 from each corner of the formation area of the substantially square back electrode 6, a voltage difference in the formation area of the back electrode 6 hardly occurs.

That is, each point on the back electrode 6 has a potential difference due to the effect of the voltage drop in proportion to the distance from the terminal 24, and a voltage is supplied to the back electrode 6 from each corner of the back electrode 6. With this configuration, it is possible to uniformly emit light while suppressing the voltage drop.

The present invention is directed to a transparent electrode having a display electrode formed of a plurality of segments of a specific shape for expressing an arbitrary shape by selective light emission made of a transparent conductive material, and a back electrode facing the transparent electrode. The present invention relates to electroluminescence in which a light emitting layer is interposed therebetween, and includes an anode (corresponding to the transparent electrode of the above embodiment) formed on a transparent substrate by function separation into a display electrode and a wiring electrode, and a hole injection layer ( The intermediate layer), the light-emitting layer, and at least the cathode (back electrode) facing the anode are sequentially laminated, and a DC voltage of about several tens of volts is applied between the anode and the cathode, so that a positive Inject holes and electrons and emit light from the light emitting layer by the energy generated at the time of their recombination,
For example, JP-B-6-32307 and JP-A-63-26
The present invention can be implemented in the so-called organic electroluminescence disclosed in Japanese Patent No. 4692 or the like in the same manner as in the above embodiment.

[0032]

According to the present invention, it is possible to avoid a current-carrying failure due to disconnection between the terminal and the back electrode at the time of manufacturing, and to reduce the potential difference at the back electrode to thereby achieve uniform light emission. It is.

[Brief description of the drawings]

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

FIG. 2 is a main part rear view for explaining terminals of a rear electrode of the embodiment.

FIG. 3 is a main part rear view for explaining terminals of a rear electrode of the embodiment.

FIG. 4 is a main part rear view for explaining terminals of a rear electrode of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Transparent electrode 21 Display electrode 22 Terminal 23 Wiring electrode 24 Terminal 3 Auxiliary electrode 4 Insulating layer (intermediate layer) 5 Light emitting layer 6 Back electrode

Claims (3)

[Claims] 1. A transparent electrode which is formed so as to be functionally separated into a display electrode and a wiring electrode on a transparent substrate, and at least one intermediate layer and a light emitting layer are sequentially formed on the transparent electrode. Electroluminescence, wherein a back electrode is formed on a light emitting layer so as to face the display electrode, wherein a plurality of terminals extending from the back electrode are provided. 2. A transparent electrode which is formed so as to be functionally separated into a display electrode and a wiring electrode on a transparent substrate, and at least one intermediate layer and a light emitting layer are sequentially formed on the transparent electrode. Electroluminescence in which a back electrode is formed on a light emitting layer so as to face the display electrode, and a plurality of terminals extending from the back electrode are provided so as to be located at diagonal positions in a formation range of the back electrode. Electroluminescence characterized by the following. 3. A transparent electrode, which is formed so as to be functionally separated into a display electrode and a wiring electrode, is formed on a transparent substrate, and at least one intermediate layer and a light emitting layer are sequentially formed on the transparent electrode. Electroluminescence in which a back electrode is formed on the light-emitting layer in opposition to the display electrode, wherein the back electrode is substantially rectangular, and a terminal drawn from the back electrode is connected to each of the back electrodes. Electroluminescence characterized in that four are provided so as to be located at corners.