Patent ID: 9123303
Filing Date: 2015-09-01
Classification: G09G

Abstract:
1. A display device comprising a liquid-crystal panel and a light source that radiates light from a back of the liquid-crystal panel, and displaying an image on the liquid-crystal panel based on an input image signal, the display device comprising: a display screen of the liquid-crystal panel, the display screen displaying a plurality of screen images; a required-brightness computation unit that computes required brightnesses for each of the screen images based on set brightness information indicating a set brightness specified for each of the screen images, the required brightnesses being a brightness of the light source required for making the display screen the set brightness; a brightness determination unit that compares the required brightnesses computed for each of the screen images, and determines the screen image corresponding to a maximum-required brightness being a highest brightness among the required brightnesses for said each of the screen images to be a maximum-required-brightness image; and a brightness control unit that performs light-source brightness control and performs image gradation control, based on a determination result, the light-source brightness control controlling the brightness of the light source so as to make the brightness of the light source the set brightness for the maximum-required-brightness image, the image gradation control controlling a gradation of the image displayed on the liquid-crystal panel in accordance with the brightness of the light source, so as to make a brightness of said each of the screen images other than the maximum-required-brightness image the set brightness specified for said each of the screen images.