Patent ID: 9076397
Filing Date: 2015-07-07
Classification: G09G

Abstract:
1. An image display device including a backlight made up of a plurality of light sources, and having a function of controlling the luminance of each light source of the backlight, the image display device characterized by comprising: a display panel, including a plurality of display elements, that displays an image based on an externally given input image; an emission luminance calculator that divides the input image into a plurality of areas, and on the basis of an input image corresponding to each area, computes a luminance during emission of light sources corresponding to each area as a first emission luminance; a correction filter that stores correction data for a designated number of areas near a single area; an emission luminance corrector that computes a second emission luminance by applying the correction filter to each area and correcting the first emission luminance on the basis of the correction data; a display data calculator that, on the basis of the input image and the second emission luminance, computes display data for controlling optical transmittance of the display elements; a panel driving circuit that, on the basis of the display data, outputs to the display panel a signal controlling the optical transmittance of the display elements; and a backlight driving circuit that, on the basis of the second emission luminance, outputs to the backlight a signal controlling the luminance of each light source; wherein, provided that a first image is defined as an image displayed on the display panel 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, the emission luminance corrector uses the correction filter to compute the second emission luminance, thereby setting each correction data value stored in the correction filter so as to yield a constant degree of spatial variation in 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.