LUMINANCE CONTROL DEVICE, DISPLAY APPARATUS USING THE SAME, LUMINANCE CONTROL METHOD AND LUMINANCE CONTROL PROGRAM

摘要

Power consumption is cut down by reducing backlight light source luminance in accordance with the variability of luminance of the picture displayed on a display panel. A picture luminance detector 31 calculates information (luminance information) representing luminance of the picture at intervals of a time unit. A picture luminance storage 32 is a memory capable of storing the past records of luminance information within a fixed period of time (some seconds to some ten seconds). A processor 33 is configured of a variation detector 34 and a light source luminance determiner 35. Variation detector 34 performs detection of the variability of picture luminance based on the luminance information on the current picture detected by picture luminance detector 31 and the past records of picture luminance information stored in picture luminance storage 32 to output variation information. Light source luminance determiner 35 determines light source luminance based on the luminance information on the current picture detected by picture luminance detector 31 and the variation information output from variation detector 34 and outputs a light source information control signal.