Patent ID: 8334934

Claim:
An image display device for displaying an image on the basis of image data comprising: an image feature quantity calculating portion which calculates a plurality of image feature quantities based on a luminance histogram of the image data; an expansion coefficient determining portion which determines an expansion coefficient based on the plurality of image feature quantities by referring to a predetermined expansion coefficient lookup table; and a luminance range expansion processing portion which performs a luminance range expansion process on the image data using the expansion coefficient, the luminance range expansion process being a process to extend a range of luminances of the image data, wherein: the image data is moving picture data, the expansion coefficient determining portion determines the expansion coefficient for each frame of the moving picture data by referring to the predetermined expansion coefficient lookup table, and the image display device further comprises: an expansion correcting portion which: determines an expansion modification volume of which an absolute value is smaller than an absolute value of an ideal expansion modification volume, the ideal expansion modification volume being a differential of a current frame ideal expansion coefficient from a previous frame expansion coefficient, the current frame ideal expansion coefficient being an expansion coefficient determined by the expansion coefficient determining portion based on the plurality of image feature quantities of a current frame referring to the predetermined expansion coefficient lookup table, the previous frame expansion coefficient being an expansion coefficient used in the luminance range expansion process of a previous frame; and generates a current frame expansion coefficient by correcting the current frame ideal expansion coefficient using the expansion modification volume, and the luminance range expansion processing portion performs the luminance range expansion process on the image data based on the current frame expansion coefficient as the expansion coefficient.