Display apparatus including light emitting device and pixel driving circuit

A display apparatus, comprising:

• a sampling light shielding pattern disposed on a device substrate;
• an upper buffer layer disposed on the device substrate while covering the sampling light shielding pattern;
• a pixel driving circuit disposed on the upper buffer layer, the pixel driving circuit including:
• a driving thin film transistor including a driving gate electrode and a driving source electrode;
• and
• a plurality of switching thin film transistors including a sampling thin film transistor electrically connected between the driving gate electrode and the driving source electrode of the driving thin film transistor;
• and
• a light emitting device disposed on the device substrate and electrically connected to the pixel driving circuit,
• wherein the sampling thin film transistor comprises a sampling gate electrode overlapping with the sampling light shielding pattern, and a sampling semiconductor pattern disposed between the sampling light shielding pattern and the sampling gate electrode, and
• wherein the sampling gate electrode comprises a first electrode region extending onto a first side surface of the sampling semiconductor pattern.