Patent ID: 8179498
Filing Date: 2012-05-15
Classification: G02F,G09G,H04N

Abstract:
1. A liquid crystal display device comprising: a liquid crystal display panel; lighting means including a plurality of lighting regions for lighting the liquid crystal display panel; driving means configured to drive the liquid crystal display panel so that an image is displayed in accordance with an input image signal; and light control means configured to control a luminance of each of the plurality of lighting regions of the lighting means, in accordance with the input image signal, each of the lighting regions having a smaller width in a left-and-right direction of a display screen of the liquid crystal display panel than in an up-and-down direction of the display screen, wherein the light control means is configured to (i) detect, from input image signals for pixels in each of display regions which correspond respectively to the plurality of lighting regions on the display screen, a maximum grayscale level of each of the display regions (ii) set a light luminance of each of the plurality of lighting regions in accordance with a corresponding one of the maximum grayscale levels thus detected, and (iii) control, in accordance with a corresponding one of light luminances thus set, a luminance of each of light sources, the liquid crystal display device further comprising: luminance distribution calculation means configured to calculate, in accordance with the light luminance set by the light control means for each of the plurality of lighting regions, luminance distribution of light entering from the lighting means into the liquid crystal display panel; and grayscale conversion means configured to convert, in accordance with the luminance distribution calculated by the luminance distribution calculation means, the input image signal into a conversion image signal, the driving means being configured to drive the liquid crystal display panel so that an image is displayed in accordance with the conversion image signal.