a backlight comprising a plurality of division areas of which emission luminance is variable for each division area;

a display panel of which transmittance of light emitted from the backlight is variable for each pixel;

one or more memories storing instructions; and

one or more processors, the one or more processors executing the instructions to:

(1) calculate emission luminance for each division area of the backlight on the basis of input image data;

(2) calculate a correction value for correcting the input image data on the basis of the emission luminance;

(3) correct the input image data on the basis of the calculated correction value; and

(4) control the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data and control light emission of each division area of the backlight on the basis of the calculated emission luminance,

wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe period,

wherein one frame period of the input image data comprises M subframe periods,

wherein a partial process executed in an N-th (N=1 to k, 1≤k<M) subframe period among the plurality of partial processes includes a process of dividing the input image data into M subframes in a vertical direction and determining emission luminance of the division area corresponding to an N-th subframe from the top on the basis of image data of the N-th subframe, and

wherein a partial process executed in an N-th (N=k+1 to M) subframe period among the plurality of partial processes includes a process of:

(a) dividing the input image data into M subframes in a vertical direction and determining emission luminance of the division area corresponding to an N-th subframe from the top on the basis of image data of the N-th subframe; and

(b) dividing the input image data into (M-k) (1≤ k<M) correction target areas in the vertical direction and calculating a correction value for correcting image data of an (N-k)-th correction target area from the top.