VIDEO DISPLAY DEVICE

摘要

The present invention effectively suppresses not only occurrences of halos but also degradation of the black level. This image display device has a liquid crystal panel (17) that displays images according to an image signal and a backlight (14) in which LEDs are used and controls the light emission brightness of the LEDs for each division region, which is obtained by dividing the backlight (14) into a plurality of regions, on the basis of a prescribed relation between a gradation value for an image region corresponding to each division region and the LED light emission brightness. When the gradation value for an image satisfies prescribed conditions, a first luminance adjusting portion (12a) adjusts the LED light emission brightness such that the range of variation in LED light emission brightness in a first range for the gradation value of the image region, which is determined on the basis of the prescribed conditions above, is smaller than the range of variations for the LED light emission brightness that is determined on the basis of the prescribed relation above, and a second luminance adjusting portion (12b) adjusts the LED light emission brightness in a second range for which the value is smaller than the first range such that the light emission brightness is smaller than a lower limit value for the LED light emission brightness adjusted above.

主权项

1. A video display device having a display panel that displays a video in accordance with a video signal and a backlight that uses LEDs as light sources for illuminating the display panel, the video display device controlling a light emission luminance of the LEDs, for each of regions obtained by dividing the backlight into a plurality of regions, based on a predetermined relationship between a gradation value of a video region corresponding to each of the regions obtained by the division and the light emission luminance of the LEDs, the video display device comprising:
a first luminance adjusting portion that, if a gradation value of the video meets a predetermined condition, adjusts the light emission luminance of the LEDs such that a variation range of the light emission luminance of the LEDs in a first range, defined based on the predetermined condition, of the gradation value of the video region is smaller than a variation range of the light emission luminance of the LEDs defined based on the predetermined relationship; and a second luminance adjusting portion that adjusts the light emission luminance of the LEDs so as to be a smaller light emission luminance than a lower limit value of the light emission luminance of the LEDs adjusted by the first luminance adjusting portion in a second range smaller in value than the first range.