Patent ID: 7948171
Filing Date: 2011-05-24
Classification: H01L

Abstract:
1. A light emitting device comprising: a substrate having an insulating surface; a semiconductor layer of a thin film transistor over the substrate; a first electrode directly connected to the semiconductor layer; an insulator covering an end portion of the first electrode; a buffer layer over the first electrode; a layer containing an organic compound over the buffer layer; and a second electrode over the layer containing an organic compound, wherein the first electrode comprises a first layer in direct contact with the semiconductor layer and with the buffer layer, and a second layer formed over of the first layer, wherein the insulator is interposed between the second layer and the buffer layer, wherein the first layer is continuous from the semiconductor layer to the buffer layer and is interposed between the second layer and the semiconductor layer, wherein the first electrode has a first region and a second region having a different number of layers from the first region, wherein a step is formed by an end part of the second layer between the first region and the second region, and wherein the step is covered with the insulator.