Patent ID: 8625357

Claim:
A local self-boosting method of a flash memory device including at least one string having memory cells respectively connected to wordlines, the local self-boosting method comprising: forming a potential well at a channel of the at least one string, forming the potential well includes driving the wordlines with a first pass voltage; and forming potential walls at the potential well to be disposed at both sides of a channel of a selected one of the memory cells, forming potential walls includes driving at least one wordline adjacent respectively to both sides of a wordline connected to the selected memory cell with a second pass voltage that is lower than the first pass voltage, wherein: the channel of the selected memory cell is locally limited by the potential walls and boosted when a program voltage is applied to the selected memory cell, application of the program voltage to the selected memory cell starting after driving of the at least one wordline with the second pass voltage has started.