Patent ID: 8772783

Claim:
A display device comprising: a pixel comprising: a substrate; a semiconductor layer over the substrate; a gate insulating layer over the semiconductor layer; a gate electrode layer over the gate insulating layer; an insulating layer over the gate electrode layer; a source electrode layer or a drain electrode layer over the insulating layer; a first electrode layer in contact with the source electrode layer or the drain electrode layer over the insulating layer; an insulator covering and being in contact with the insulating layer, the source electrode layer or the drain electrode layer, and a portion of the first electrode layer; an electroluminescent layer over and in contact with a first surface of the first electrode layer and the insulator; and a second electrode layer over and in contact with the electroluminescent layer and the insulator, wherein the insulator has a first projection portion over a region where the source electrode layer or the drain electrode layer overlaps with the gate electrode layer, wherein the insulator has a second projection portion over the source electrode layer or the drain electrode layer, wherein the second projection portion does not overlap with the gate electrode layer, wherein a height of the first projection portion from a surface of the substrate is higher than a height of the second projection portion from the surface of the substrate; wherein the insulator covers a periphery of the first electrode layer, and wherein the insulator crosses over the first surface of the first electrode layer parallel to a short side of the first surface of the first electrode layer in two places so that the insulator has a first aperture, a second aperture and a third aperture overlapping with the first surface of the first electrode layer.