Lighting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYasuyuki Arai
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Abstract
An object of the invention is to provide a lighting device which can suppress luminance nonuniformity in a light emitting region when the lighting device has large area. A layer including a light emitting material is formed between a first electrode and a second electrode, and a third electrode is formed to connect to the first electrode through an opening formed in the second electrode and the layer including a light emitting material. An effect of voltage drop due to relatively high resistivity of the first electrode can be reduced by electrically connecting the third electrode to the first electrode through the opening.
Claims27
A lighting device comprising:
- a first electrode over a substrate;
- a first layer including a light emitting material over the first electrode;
- a second electrode over the first layer;
- a third electrode over and in contact with the first electrode;
- an insulating layer over and in contact with the first electrode,
- wherein the first layer extends beyond an edge of the second electrode,
- wherein the insulating layer is between the first layer and the third electrode, and
- wherein the third electrode is not in direct contact with the first layer and the second electrode.
A lighting device comprising:
- a first electrode over a substrate;
- a first layer including a light emitting material over the first electrode;
- a second electrode over the first layer;
- a third electrode over and in contact with the first electrode;
- an insulating layer over and in contact with the first electrode,
- wherein the first layer extends beyond an edge of the second electrode,
- wherein the insulating layer is between the first layer and the third electrode,
- wherein the third electrode is not in direct contact with the first layer and the second electrode, and
- wherein the first layer comprises:
- a second layer including a first light emitting material;
- a third layer including a second light emitting material;
- and
- a charge generation layer between the second layer and the third layer.
A lighting device comprising:
- a first electrode over a substrate;
- a first layer including a light emitting material over the first electrode;
- a second electrode over the first layer;
- a third electrode over and in contact with the first electrode;
- an insulating layer over and in contact with the first electrode,
- wherein the first layer extends beyond an edge of the second electrode,
- wherein the insulating layer is between the first layer and the third electrode,
- wherein the third electrode is not in direct contact with the first layer and the second electrode, and
- wherein the first layer comprises:
- a second layer including a first light emitting material;
- and
- a third layer including a second light emitting material.
Dependencies are inferred from the claim text.