Disclosed are an image-processing circuit capable of improving the ability to express a high-resolution image and a display device having the same and a method of driving a display device. The image-processing circuit determines whether input image data represents one or more of a forward diagonal line edge, a backward diagonal line edge, and a horizontal line edge, and then determines arrangement of a center unit pixel, and thereafter renders data of the center unit pixel into data of a peripheral unit pixel based on edge information and the arrangement of the center unit pixel.