Thin film transistor, organic light emitting device including thin film transistor, and manufacturing method thereof

An organic light emitting device comprising:

• a substrate;
• a driving transistor comprising:
• a first control electrode formed on the substrate;
• an insulating layer formed on the first control electrode and the substrate;
• a first electrode and a second electrode spaced apart from each other with respect to the first control electrode and formed on the insulating layer;
• a first ohmic contact layer and a second ohmic contact layer formed on the first electrode and the second electrode;
• and
• a first semiconductor layer formed on the first ohmic contact layer and the second ohmic contact layer to fill the first electrode and the second electrode;
• a pixel electrode connected to the second electrode;
• an organic light emitting member formed on the pixel electrode;
• a counter electrode formed on the organic light emitting member;
• and
• a switching transistor electrically connected to the first control electrode,
• wherein the switching transistor comprises:
• a second control electrode connected to a gate line, a second semiconductor layer formed in the area corresponding to the second control electrode;
• a third electrode connected to a data line and a fourth electrode electrically connected to the second semiconductor layer;
• a third ohmic contact layer formed between the third electrode and the second semiconductor layer;
• and
• a fourth ohmic contact layer formed between the fourth electrode and the second semiconductor layer.