| 摘要 |
A back light (32) is provided with light sources (46a,46b,46c), respective lighting control circuits (50a,50b,50c) for lighting the light sources, and a brightness control circuit (48) for outputting respective light volume adjusting signals to the lighting control circuits. The brightness control circuit in response to receiving a luminance adjusting signal (LUM), adjusts only the light volume adjusting signals for a portion of the number of light sources, and fixes output of the rest of the light volume adjusting signals. The lighting control circuits apply voltages corresponding to the light volume adjusting signals to the light sources, thereby adjusting the luminance of the light sources. The light volume adjusting signals can be adjusted one by one, which facilitates luminance adjustment of the back light per se. Thus, by adjusting each light source at a time to the minimum luminance, the screen brightness of the liquid crystal display having this back light can be lowered to an appropriate level when it is used in dark places. <IMAGE>
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