Patent ID: 8575631
Filing Date: 2013-11-05
Classification: H01L

Abstract:
1. 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.