Patent ID: 8742656

Claim:
A method of manufacturing an organic light emitting device comprising: forming a gate electrode on a substrate; forming a first insulating film on the gate electrode; forming a semiconductor layer on the first insulating film; forming a second insulating film on the semiconductor layer; forming a first electrode on the second insulating film; forming source and drain electrodes connected to the semiconductor layer, the drain electrode being connected to the first electrode and covers a part of the first electrode; forming a bank layer on the first electrode; etching the bank layer so that a taper angle of an edge area of the bank layer contacting the first electrode lies substantially in a range between 20° and 35°; forming a light emitting layer on the first electrode by evaporating an evaporation material generated in an evaporation source; and forming a second electrode on the light emitting layer, wherein the taper angle of the edge area of the bank layer is an angle between a surface of the first electrode and a surface of the light emitting layer, and the taper angle prevents damage by an electric field concentration and evaporation shadow phenomenon in the edge area, and wherein a scattering angle of the evaporation material lies substantially in a range between 35° and 55°.