A display panel driver includes a scaler circuit performing image enlargement processing on input image data corresponding to an input image to generate α-times enlarged image data corresponding to an α-times enlarged image (α 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 α-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 α), 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 α-times enlarged image.