Patent ID: 8283862

Claim:
A method for manufacturing a light emitting device comprising the steps of: forming a thin film transistor including a semiconductor layer having a source region, a drain region, and a channel formation region therebetween, a gate insulating film, and a gate electrode over a first substrate having an insulating surface; forming a highly thermostable planarizing film over an uneven shape reflected by the thin film transistor wherein the highly thermostable planarizing film is a SiOx film including an alkyl group formed by application; forming an opening portion which has a tapered shape on a side face and is located over the source region or the drain region and a peripheral portion which has a tapered shape by selectively removing the highly thermostable planarizing film; forming a contact hole which reaches the source region or the drain region by selectively removing the gate insulating film; forming an electrode which reaches the source region or the drain region; forming an anode containing SiOx which is in contact with the electrode; forming a bank covering an edge portion of the anode; forming a layer containing an organic compound over the anode; forming a cathode over the layer containing the organic compound; and attaching a second substrate to the first substrate with a sealant.