Patent ID: 7167214

Claim:
A signal processing unit in a liquid crystal display device, to which a video signal is input and through which an image is displayed on a liquid crystal panel, comprising: a brightness component appearance frequency measuring unit that measures an appearance frequency of each brightness component in the video signal; a parameter outputting unit that outputs a distribution of each brightness component in the video signal, as a plurality of parameters representing the distribution characteristics of the brightness and the distribution characteristics of the contrast in each of a plurality of areas in the image, based on said appearance frequency measured by the brightness component appearance frequency measuring unit; a brightness component changing unit that changes signals which have been prepared in advance, respectively corresponding to the plurality of parameters outputted from the parameter outputting unit, by using the plurality of parameters, that changes a distribution of each brightness component in the video signal, by using a changing signal which is obtained by changing each of the signals which have been prepared in advance, and that outputs the processed, input video signal as an output video signal in which the distribution of each brightness component thereof is changed.