[0001] The present invention relates to a password input system using an FND, more specifically, a method of selecting a number displayed on an FND (Flexible Numeric Display) and inputting the password using a password, To a password input system using an FND having a password leakage prevention function. A password input system using an FND according to the present invention includes: a pad unit having a printed circuit board therein; An FND provided on a front surface of the pad unit for sequentially displaying numbers; A confirmation button provided on a front surface of the pad unit for selecting a number displayed on the FND and inputting the number using a password; A cancel button provided on a front surface of the pad unit for canceling a mistake in the input of a password and a malfunction; A storage unit for storing password information selected and input through the confirmation button; A driving unit for selectively operating the opening / closing switch through the input password information; And a controller for comparing the inputted password with the password stored in the storage unit and controlling the operation of the open / close switch through the drive unit only when the password is inputted according to the selection of the OK button. do.
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