Thin-film transistor substrate, method of manufacturing the same and display apparatus having the same

A display apparatus comprising:

• a first substrate;
• a gate electrode disposed on the first substrate, and being electrically connected to a gate line;
• a gate insulating layer disposed on the first substrate to cover the gate line and the gate electrode;
• a semiconductor layer disposed on the gate insulating layer corresponding to the gate electrode;
• a source electrode electrically connected to a data line formed on the gate insulating layer in a direction crossing a longitudinal direction of the gate line, the source electrode being on the semiconductor layer;
• a drain electrode formed on the semiconductor layer, the drain electrode being opposite to the source electrode to define a channel area of the semiconductor layer between the source and drain electrodes;
• an organic layer disposed on the gate insulating layer to cover the source electrode, the data line and the drain electrode, the organic layer having a first opening for exposing the channel area;
• an inorganic insulating layer disposed on the organic layer and an inner surface of the first opening, the inorganic insulating layer having a substantially uniform thickness;
• a pixel electrode disposed on the inorganic insulating layer and electrically connected to the drain electrode;
• and
• a second substrate facing the first substrate and including a common electrode.