An image scale device for up-scaling an input image by generating data signals for a plurality of additional pixels, the additional pixels added to the input image to generate an up-scaled image, the device comprising an RGB interpolator configured to generate red (R), green (G), and blue (B) data signals for each of the additional pixels on the basis of the R, G, and B data signals of an arbitrary pixel among pixels of the input image that are adjacent to the respective additional pixel, and a W interpolator configured to generate a white (W) data signal for each of the additional pixels on the basis of W data signals of the pixels of the input image that are adjacent to the respective additional pixel.