An object is to moderate the occurrence of mura in an oblique view in an image display device that conducts area active driving. An emission luminance calculator (151) computes a luminance (first emission luminance) (32) of LEDs in respective areas on the basis of an input image (31). The emission luminance corrector (152) applies a correction to the first emission luminance (32) on the basis of correction data (33) in an LED filter (155). Herein, provided that a first image is defined as an image displayed in the case of being externally given an image in which a high-gradation region and a low-gradation region neighbor each other as the input image (31), the emission luminance corrector (152) uses the LED filter (155) to compute a second emission luminance (34), thereby setting the values of correction data (33) stored in the LED filter (155) so as to yield a constant degree of spatial variation in the output gradations between the high-gradation region and the low-gradation region in the case of viewing the first image from a designated oblique direction.