The present invention relates to a method of implementing a method for controlling the brightness level for a liquid-crystal display backlight in sequence on the basis of the maximum luminance value and a low-power mode of the backlight is calculated from the luminance image data for the frame stored in the frame memory, will be. How to adjust the luminance of the liquid crystal display device backlight according to the present invention the luminance of the backlight on the basis of the maximum luminance value and the step of calculating the maximum luminance value from the luminance image data, the output of the frame a predetermined number of in the case where the step of calculating the levels, and comparing the brightness levels in the calculated backlight and before the luminance level of the backlight, the calculated luminance level is not equal to the previous brightness level, the brightness of the backlight a comprises the step of adjusting a predetermined level. According to the present invention, due to the sudden change in luminance can be reduced, the screen of the screen flickering phenomenon, and can also naturally be the contrast of the screen as a whole.
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