BACKLIGHT DEVICE, ITS CONTROL METHOD AND IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a technique enabling suppression of luminance unevenness and color unevenness regardless of a direction of a screen in an image display device capable of changing the direction of the screen.

SOLUTION: A backlight device of an image display device capable of changing a direction of a screen comprises: a plurality of light sources capable of independently controlling emission for each of a plurality of divided light source blocks; storage means for storing unevenness correction data set so as to limit the luminance of each light source block within a predetermined allowable range to a target luminance for each direction of the screen and used for determining a drive signal of the light source of each light source block; acquisition means for obtaining a direction of the screen; and control means for determining a drive signal of the light source of each light source block using an unevenness correction data corresponding to a direction of the screen.

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