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

A display apparatus comprising:

• a first substrate including a display area;
• a second substrate facing the first substrate;
• a plurality of pixels arranged on the first substrate in the display area;
• and
• a thin film transistor arranged on the first substrate to switch a data signal applied to each pixel,
• wherein the thin film transistor comprises:
• a gate electrode arranged on the first substrate;
• a semiconductor pattern arranged on the gate electrode, the semiconductor pattern including a source area, a drain area, and a channel area;
• a first etch stop pattern arranged on the semiconductor pattern to cover the channel area;
• a second etch stop pattern arranged on the first etch stop pattern;
• a source electrode arranged on the semiconductor pattern in the source area;
• and
• a drain electrode arranged on the semiconductor pattern in the drain area and spaced apart from the source electrode.