The present invention relates to a device and a method for image enlargement and a display panel driver using the same. The display panel driver includes: a scaler circuit performing image enlargement processing on input image data corresponding to an input image to generate [alpha]-times enlarged image data corresponding to an [alpha]-times enlarged image, wherein [alpha] is a number larger than one which cannot be represented as 2k; and a driver section driving a display panel. In calculating a pixel value of a target pixel of the [alpha]-times enlarged image, the scaler circuit generates enlarged image data including 2n-times enlarged image data corresponding to a 2n-times enlarged image obtained by enlarging the input image with an enlargement factor of 2n (n is the smallest integer determined so that 2n is larger than [alpha]), and calculates the pixel value of the target pixel from the 2n-times enlarged image data through interpolation processing of pixel values of pixels of the 2n-times enlarged image corresponding to the target pixel of the [alpha]-times enlarged image.