A pixel unit of a display device including: an OLED; a first transistor including a first electrode connected to a first node, a second electrode connected to a second node, and a third electrode connected to a third node; a capacitor including a first electrode receiving a power voltage and a second electrode connected to the first node; a second transistor including a first electrode receiving a scan signal, a second electrode receiving a data voltage and a third electrode connected to the second node; a third transistor including a first electrode receiving the scan signal, a second electrode connected to the first node and a third electrode connected to the third node, wherein at least one of the first and third transistors includes a fourth electrode, the fourth electrode receives a compensation voltage when an operation temperature is above a preset temperature and is floated when the operation temperature is equal to or more than the preset temperature.