Image display apparatus and control method therefor

A control method for an image display apparatus which includes:

• a lighting apparatus composed of a plurality of light emission blocks, the emissions of lights of which are able to be controlled independently of one another;
• and
• a display panel configured to control the transmittances of the lights from said lighting apparatus for each pixel;
• said method comprising:
• a first calculation step of calculating an amount of light emission for each light emission block based on an image signal;
• a step of reading in representative point brightness data and brightness distribution data from a storage unit which is configured to store the representative point brightness data for each case where each of said plurality of light emission blocks is caused to emit light, the representative point brightness data is data of brightnesses in predetermined representative points provided in each of said plurality of light emission blocks at the time when only one of said light emission blocks is caused to emit light with a predetermined amount of light emission, and which is also configured to store the brightness distribution data which is data showing brightness distribution in individual positions between mutually adjacent representative points of the one of said light emission blocks at the time when only the one of said light emission blocks is caused to emit light with the predetermined amount of light emission;
• a second calculation step of calculating an amount of correction for correcting a pixel value of a pixel in each of positions which correspond to the individual representative points of said plurality of light emission blocks, respectively, based on the amount of light emission for each of said light emission blocks and the representative point brightness data of said plurality of light emission blocks, and calculating an amount of correction for correcting a pixel value of each of pixels other than those at said representative points based on the amount of correction for correcting the pixel value of the pixel in each of the positions which correspond to the individual representative points, respectively, and said brightness distribution data;
• and
• a correction step of outputting to said display panel a correction image signal in which a pixel value of each pixel of an image signal inputted thereto is corrected by the use of the amount of correction calculated in said second calculation step.