I guess I didn't state my issue clearly. I don't want the highest contrast ratio possible for the display. What I do want is, for a given white luminance, say 120 cd/m2, I would like to get the deepest blacks within that parameter, regardless of the contrast ratio. I am aware that, given the luminance of 120, the lower the black level the higher the contrast ratio, but it will not be the huge contrast ratio that would result from, say, the highest level of luminance the display is capable of.