NON-VOLATILE MEMORY DEVICE AND MEMORY SYSTEM INCLUDING THE SAME

A non-volatile memory device and a read method thereof are disclosed. The read method includes providing a memory block having memory cells connected to word lines and connected in serial to a bit line, sensing potential of the bit line by applying a first read voltage to a selected word line of the word lines and providing a first pass voltage to an unselected word line adjacent to the selected word line, sensing potential of the bit line by applying a second read voltage higher than the first read voltage to the selected word line and providing a second pass voltage lower than the first pass voltage to the unselected word line adjacent to the selected word line, and sensing potential of the bit line by applying a third read voltage higher than the second read voltage to the selected word line and providing a third pass voltage lower than the second pass voltage to the unselected word line adjacent to the selected word line.