Light emitting device
First Claim
1. A light emitting device comprising:
- a first electrode;
a first chemical compound layer containing a first organic substance;
an opposing electrode;
a second chemical compound layer containing a second organic substance; and
a second electrode, wherein the first chemical compound layer is disposed between the first electrode and the opposing electrode, and the second chemical compound layer is disposed between the opposing electrode and the second electrode;
wherein a fixed voltage is applied to the opposing electrode; and
wherein one of the first chemical compound layer and the second chemical compound layer emits light by applying a first voltage to the first electrode and simultaneously applying a second voltage which is inverse in polarity to the first voltage taking the fixed voltage applied as a reference to the second electrode.
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Accused Products
Abstract
A light emitting element, in which voltages having different polarities are applied alternately in order to prevent the accumulation of electric charge in an organic compound layer of the light emitting element, and in which light is always emitted, no matter whether a positive polarity voltage or a negative polarity voltage is applied, is provided. An opposing electrode is formed between a first electrode and a second electrode, and a first light emitting element having a compound layer that contains a first organic substance between the first electrode and the opposing electrode, and a second light emitting element having a compound layer that contains a second organic substance between the opposing electrode and the second electrode, are formed in the present invention. Note that a constant voltage (reference voltage) is imparted to the opposing electrode, and that voltages having inverse polarities are applied simultaneously, and alternately for fixed periods of time, to the first electrode and the second electrode. A light emitting element that always emits light, even if the polarity of the applied voltage changes, can thus be formed.
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Citations
35 Claims
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1. A light emitting device comprising:
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a first electrode;
a first chemical compound layer containing a first organic substance;
an opposing electrode;
a second chemical compound layer containing a second organic substance; and
a second electrode, wherein the first chemical compound layer is disposed between the first electrode and the opposing electrode, and the second chemical compound layer is disposed between the opposing electrode and the second electrode;
wherein a fixed voltage is applied to the opposing electrode; and
wherein one of the first chemical compound layer and the second chemical compound layer emits light by applying a first voltage to the first electrode and simultaneously applying a second voltage which is inverse in polarity to the first voltage taking the fixed voltage applied as a reference to the second electrode. - View Dependent Claims (2, 3, 4, 5)
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6. A light emitting device comprising:
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a first electrode;
a first chemical compound layer containing a first organic substance;
an opposing electrode;
a second chemical compound layer containing a second organic substance; and
a second electrode, wherein the first chemical compound layer is disposed between the first electrode and the opposing electrode, and the second chemical compound layer is disposed between the opposing electrode and the second electrode;
wherein a fixed voltage is applied to the opposing electrode; and
wherein one of the first chemical compound layer and the second chemical compound layer emits light alternately for fixed periods by applying a voltage having one of a positive polarity and a negative polarity taking the fixed voltage as a reference alternately for the fixed periods to the first electrode and simultaneously applying a voltage which is inverse in polarity to the voltage applied to the first electrode taking the fixed voltage as a reference to the second electrode. - View Dependent Claims (7, 8, 9, 10)
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11. A light emitting device comprising:
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a first electrode;
a first chemical compound layer containing a first organic substance;
an opposing electrode;
a second chemical compound layer containing a second organic substance; and
a second electrode, wherein the first chemical compound layer is disposed between the first electrode and the opposing electrode, and the second chemical compound layer is disposed between the opposing electrode and the second electrode;
wherein a fixed voltage is applied to the opposing electrode; and
wherein by applying a voltage having one of a positive polarity and a negative polarity taking the fixed voltage as a reference alternately for fixed periods to the first electrode and simultaneously applying a voltage which is inverse in polarity to the voltage applied to the first electrode taking the fixed voltage as a reference to the second electrode, a forward bias is applied to one of the first chemical compound layer and the second chemical compound layer, and simultaneously a reverse bias is applied to the other one of the first chemical compound layer and the second chemical compound layer; and
polarities of the biases applied to the first chemical compound layer and the second chemical compound layer are changed alternately for the fixed periods. - View Dependent Claims (12, 13, 14, 15)
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16. A light emitting device comprising:
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a first anode electrode;
a first chemical compound layer containing a first organic substance;
an cathode electrode;
a second chemical compound layer containing a second organic substance; and
a second anode electrode, wherein the first chemical compound layer is disposed between the first electrode and the opposing electrode, and the second chemical compound layer is disposed between the opposing electrode and the second electrode;
wherein the first electrode and the second electrode are formed by an anodic material and the opposing electrode is formed by a cathodic material;
wherein a fixed voltage is applied to the opposing electrode; and
wherein the first chemical compound layer emits light by applying a voltage having a positive polarity taking the fixed voltage as a reference to the first electrode, and electric charge accumulated in the second chemical compound layer is simultaneously relieved by applying a voltage having a negative polarity taking the fixed voltage as a reference to the second electrode. - View Dependent Claims (17, 18, 19, 20)
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21. A light emitting device comprising:
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a first electrode;
a first chemical compound layer containing a first organic substance;
an opposing electrode;
a second chemical compound layer containing a second organic substance; and
a second electrode, wherein the first chemical compound layer is disposed between the first electrode and the opposing electrode, and the second chemical compound layer is disposed between the opposing electrode and-the second electrode;
wherein the first electrode and the second electrode are formed by an anodic material and the opposing electrode is formed by a cathodic material;
wherein a fixed voltage is applied to the opposing electrode;
wherein by applying a voltage having one of the positive polarity and the negative polarity taking the voltage applied to the opposing electrode as a reference alternately for fixed periods to the first electrode, and simultaneously applying a voltage, which is inverse in polarity to the voltage applied to the first electrode taking the voltage applied to the opposing electrode as a reference, alternately for the fixed periods to the second electrode;
the first chemical compound layer emits light during applying the positive polarity voltage to the first electrode; and
the second chemical compound layer emits light during applying the positive polarity voltage to the second electrode. - View Dependent Claims (22, 23, 24, 25)
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26. A light emitting device comprising:
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a first anode electrode;
a first chemical compound layer containing a first organic substance;
an cathode electrode;
a second chemical compound layer containing a second organic substance; and
a second anode electrode, wherein the first chemical compound layer is disposed between the first electrode and the opposing electrode, and the second chemical compound layer is disposed between the opposing electrode and the second electrode;
wherein a fixed voltage is applied to the opposing electrode;
wherein a voltage having one of a positive polarity and a negative polarity taking the fixed voltage as a reference is alternately for fixed periods applied to the first electrode and simultaneously a voltage which is inverse in polarity to the voltage applied to the first electrode taking the fixed voltage as a reference is applied to the second electrode, wherein the first chemical compound layer emits light by applying a voltage having the positive polarity taking the fixed voltage as a reference to the first electrode, and electric charge accumulated in the second chemical compound layer is simultaneously relieved by applying a voltage having the negative polarity taking the fixed voltage as a reference to the second electrode. - View Dependent Claims (27, 28, 29, 30)
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31. A light emitting device comprising:
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a first anode electrode;
a first chemical compound layer containing a first organic substance over the first anode electrode;
an cathode electrode over the first chemical compound;
a second chemical compound layer containing a second organic substance over the cathode electrode; and
a second anode electrode over the second chemical compound layer. - View Dependent Claims (32, 33, 34, 35)
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Specification