Pixel driving circuit and electroluminescent display device including the same

A pixel driving circuit included in a single pixel of a display device, single pixel comprising:

• a driving transistor implemented as a p-type metal-oxide-semiconductor (PMOS) transistor, the driving transistor including a gate connected to a first node, a drain connected to a second node, and a source electrically connected to a high potential voltage line through which a high potential voltage is provided;
• a first capacitor including one end connected to the first node;
• a first transistor implemented as an NMOS transistor including an oxide semiconductor and applying a first voltage to the first node in response to a first scan signal;
• a second transistor applying a second voltage having a second voltage level different from or same as a first voltage level of the first voltage to an anode of a light-emitting element in response to a second scan signal supplied to a gate electrode of the second transistor via a first scan line that is connected to the gate electrode of the second transistor;
• a third transistor implemented as an NMOS transistor including an oxide semiconductor, and electrically connecting the first node to the second node in response to a third scan signal supplied to a gate electrode of the third transistor via a second scan line that is connected to the gate electrode of the third transistor and different from the first scan line, the third scan signal being different from the second scan signal such that the third transistor is not turned on while the second transistor is turned on;
• a fourth transistor applying a data voltage to the driving transistor in response to a fourth scan signal;
• a first emission transistor implemented as a PMOS transistor, the first emission transistor electrically connecting the second node to the anode of the light-emitting element in response to an emission signal;
• and
• a second emission transistor implemented as a PMOS transistor, the second emission transistor turned-on and electrically connected to another end of the first capacitor in response to the emission signal.