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US 8,552,440 B2Granted
Lighting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei Yamazaki
Life of this patent
Estimating the term…
Abstract
For integration of light-emitting elements and for suppression of a voltage drop, plural stages of light-emitting element units provided over a substrate having an insulating surface and each including a plurality of light-emitting elements which is connected in parallel are connected in series. Further, besides a lead wiring with a large thickness, a plurality of auxiliary wirings with different widths and different thicknesses is used, and the arrangement of the wirings, electrodes of the light-emitting elements, and the like is optimized. Note that in the lighting device, light emitted from the light-emitting element passes through the substrate having an insulating surface and then is extracted.
Claims15
A lighting device comprising:
- plural stages of light-emitting element units;
- a first wiring in contact with a first-stage light-emitting element unit of the plural stages of light-emitting element units;
- and
- a second wiring in contact with a last-stage light-emitting element unit of the plural stages of light-emitting element units,
- wherein the first-stage light-emitting element unit includes at least a first light-emitting element and a second light-emitting element which are connected in parallel,
- wherein a light-emitting element unit adjacent to the first-stage light-emitting element unit includes at least a third light-emitting element and a fourth light-emitting element which are connected in parallel,
- wherein the first light-emitting element, the second light-emitting element, the third light-emitting element, and the fourth light-emitting element each include a first electrode layer with a light-transmitting property, an organic compound-containing layer which is in contact with the first electrode layer, a second electrode layer with reflectivity which is in contact with the organic compound-containing layer, and an auxiliary wiring which is in contact with the first electrode layer and has a narrower width than the first wiring and the second wiring,
- wherein the second electrode layer of the first light-emitting element and the auxiliary wiring of the third light-emitting element are connected to each other, so that the first light-emitting element and the third light-emitting element are connected in series,
- wherein the second electrode layer of the second light-emitting element and the auxiliary wiring of the fourth light-emitting element are connected to each other, so that the second light-emitting element and the fourth light-emitting element are connected in series,
- wherein the auxiliary wiring of each of the light-emitting elements in the first-stage light-emitting element unit is in contact with the first wiring, and
- wherein the second electrode layer of each of the light-emitting elements in the last-stage light-emitting element unit is in contact with the second wiring.
8 more elements
A lighting device comprising:
- plural stages of light-emitting element units connected in series;
- a first wiring in contact with a first-stage light-emitting element unit of the plural stages of light-emitting element units;
- and
- a second wiring in contact with a last-stage light-emitting element unit of the plural stages of light-emitting element units,
- wherein the first-stage light-emitting element unit includes at least a first light-emitting element and a second light-emitting element which are connected in parallel,
- wherein a light-emitting element unit adjacent to the first-stage light-emitting element unit includes at least a third light-emitting element and a fourth light-emitting element which are connected in parallel,
- wherein the first light-emitting element, the second light-emitting element, the third light-emitting element, and the fourth light-emitting element each include a first electrode layer with a light-transmitting property, an organic compound-containing layer which is in contact with the first electrode layer, a second electrode layer with reflectivity which is in contact with the organic compound-containing layer, a first auxiliary wiring which is in contact with the first electrode layer and has a narrower width than the first wiring and the second wiring, and a second auxiliary wiring which is in contact with the first electrode layer and has a narrower width than the first auxiliary wiring,
- wherein the second electrode layer of the first light-emitting element and the auxiliary wiring of the third light-emitting element are connected to each other, so that the first light-emitting element and the third light-emitting element are connected in series,
- wherein the second electrode layer of the second light-emitting element and the auxiliary wiring of the fourth light-emitting element are connected to each other, so that the second light-emitting element and the fourth light-emitting element are connected in series,
- wherein the first auxiliary wiring of each of the light-emitting elements in the first-stage light-emitting element unit is in contact with the first wiring, and
- wherein the second electrode layer of each of the light-emitting elements in the last-stage light-emitting element unit is in contact with the second wiring.
8 more elements
Dependencies are inferred from the claim text.