Provided is an image display device capable of adjusting contrast and brightness and adjusting method therefor, wherein the watcher can watch a more excellent picture to make the contrast and brightness interlock and be adjusted to make the contrast and brightness better in a minimal limit saturation region and the pause region. The method includes the following steps: a first step of calculating, storing the imaginary saturation region generated when adjusting the contrast of the image signals according to the reset contrast higher than the former contrast; the second step, wherein, if the input image signals judges whether the imaginary saturation region is larger than the special limit saturation region; the third step to advance the contrast of the input image signals and output if the imaginary saturation region is not large; the fourth step to advance the brightness of the input image signals, reduce the contrast and output if the imaginary saturation region is large. |