A method for displaying a three-dimensional (“3D”) image, wherein the method includes; sequentially displaying a left frame image corresponding to a left eye and a right frame image corresponding to a right eye on a display panel, blocking a light provided to a display block of the display panel when the display block displays a mixed image which includes a left eye image of the left frame image corresponding to the left eye and a right eye image of the right frame image corresponding to the right eye, and providing the light to the display block of the display panel when the display block displays only one of the left eye image and the right eye image.