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US 8,575,631 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 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.
Claims15
A lighting device comprising:
- plural stages of light-emitting element units;
- a first wiring electrically connected to and in contact with a first-stage light-emitting element unit of the plural stages of light-emitting element units;
- and
- a second wiring electrically connected to and 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-blocking property, an organic compound-containing layer in contact with the first electrode layer, and a second electrode layer with a light-transmitting property in contact with the organic compound-containing layer,
- wherein the first electrode layer of the third light-emitting element and the first electrode layer of the fourth light-emitting element each include a first region in contact with the organic compound-containing layer and a second region having a narrower line width than the first region,
- wherein the second electrode layer of the first light-emitting element is in contact with the second region of the first electrode layer of the third light-emitting element, 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 is in contact with the second region of the first electrode layer of the fourth light-emitting element, so that the second light-emitting element and the fourth light-emitting element are connected in series,
- wherein the first electrode layer of each of the light-emitting elements included in the first-stage light-emitting element unit is a region branching from the first wiring, and
- wherein the second electrode layer of each of the light-emitting elements included in the last-stage light-emitting element unit is electrically connected to and in contact with the second wiring.
9 more elements
A lighting device comprising:
- plural stages of light-emitting element units;
- and
- a first wiring and a second wiring which overlap with the plural stages of light-emitting element units with a planarization insulating film provided therebetween, wherein the first wiring and the second wiring are provided under the plural stages of light-emitting element units,
- wherein the first wiring is electrically connected to a first-stage light-emitting element unit of the plural stages of light-emitting element units in a first opening formed in the planarization insulating film,
- wherein the second wiring is electrically connected to a last-stage light-emitting element unit of the plural stages of light-emitting element units in a second opening formed in the planarization insulating film,
- 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-blocking property, an organic compound-containing layer in contact with the first electrode layer, and a second electrode layer with a light-transmitting property in contact with the organic compound-containing layer,
- wherein the first electrode layer of the third light-emitting element and the first electrode layer of the fourth light-emitting element each include a first region in contact with the organic compound-containing layer and a second region having a narrower line width than the first region,
- wherein the second electrode layer of the first light-emitting element is in contact with the second region of the first electrode layer of the third light-emitting element, 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 is in contact with the second region of the first electrode layer of the fourth light-emitting element, so that the second light-emitting element and the fourth light-emitting element are connected in series,
- wherein the first electrode layer of each of the light-emitting elements included in the first-stage light-emitting element unit is electrically connected to the first wiring, and
- wherein the second electrode layer of each of the light-emitting elements included in the last-stage light-emitting element unit is electrically connected to the second wiring.
10 more elements
Dependencies are inferred from the claim text.