Light source control apparatus, control method for controlling the same, and liquid crystal display apparatus

摘要

Disclosed is a light source control apparatus which controls a plurality of light sources; wherein a luminance can be independently controlled for each of the plurality of light sources by changing a ratio between a turned-on period and a turned-off period; the light source control apparatus comprising a determining unit configured to determine the respective luminances of the plurality of light sources and to determine, as a light source driving condition, a length of the turned-on period of each of the plurality of light sources and a turn-on reference timing as a start timing of the turned-on period; a correcting unit configured to perform correction for the light source driving condition to lower the luminance(s) of at least one of the plurality of light sources so that an electric power consumption is not more than a threshold value at all of the turn-on reference timings.

主权项

1. A light source control apparatus which controls a plurality of light sources comprising:
a power source which supplies an electric power to the plurality of light sources; a driver unit configured to successively turn on the plurality of light sources; a determining unit configured to determine the luminance of each of the plurality of light sources in accordance with an inputted image signal and determines a Pulse Width Modulation (PWM) value relating to a length of a turn-on period within one frame period of each of the plurality of light sources on the basis of the determined luminance; a calculating unit configured to calculate an electric power consumption of the power source at a start timing or an end timing of the turn-on period of each of the plurality of light sources, which are successively turned on, on the basis of the PWM value determined by the determining unit; and a correcting unit configured to limit, if the electric power consumption calculated by the calculating unit exceeds a predetermined threshold value, the number of light sources which are simultaneously in a lighting state at the start timing or the end timing of the turn-on period of each of the plurality of light sources by shortening the length of the turn-on period of at least one or some of the plurality of light sources so that the electric power consumption does not exceed the threshold value at the start timing or the end timing of the turn-on period of each of the plurality of light sources, which are successively turned on.