Patent ID: 8217968

Claim:
An image display device, comprising: a backlight capable of controlling light intensity; a light modulator configured to modulate a transmittance of light from the backlight; a determiner configured to determine light intensity of the backlight based on luminance values of an input image; an intensity distribution estimator configured to estimate intensity distribution of the light from the backlight in each pixel position of the light modulator when the backlight irradiates light having the light intensity determined by the determiner to the light modulator; a detector configured to detect a maximum signal value from signal values of RGB subpixels forming each pixel of the input image; a transmittance corrector configured to calculate a corrected transmittance by converting the signal value of each subpixel of the input image in accordance with the light intensity in each pixel position of the input image estimated by the intensity distribution; a gray-scale level corrector configured to calculate a maximum corrected value by correcting the corrected transmittance of the subpixel having the maximum signal value in a displayable range of the light modulator; a signal corrector configured to calculate a corrected value by calculating a gain between the corrected transmittance and the maximum corrected value of the subpixel having the maximum signal value and multiplying the corrected transmittance of each subpixel excepting the subpixel having the maximum signal value by the gain; a light modulation controller configured to drive and control the light modulator so that an image in accordance with the corrected value and the maximum corrected value of each subpixel is displayed; and a backlight controller configured to control the backlight so that the backlight emits light having the light intensity determined by the determiner.