R-T-BOnly LGs have it. I think they own a patent. Samsung notably doesn't.

mtcn77Well, yeah, but 'off' is only an illusion with the background radiation present in our universe. :)
I'm just making a case to adapt to it: cut back gamma for the blue channel 0.2 notes increase its brightness and contrast, reduce lcd brightness. I read an essay sometime in the past. I cannot find it, but can vouch for it to work out as stated.

It was a case of replacing mobile brightness with gamma and saturation. Let's be realistic, backglow is uncalibrated black level.

In other words,

Gamma is contrast.

The Contrast control on monitors and television sets is actually brightness, and the Brightness control is, as we've seen, black level.

mtcn77Turns out I have stumbled upon a great idea. Thanks, Norman Koren.
www.normankoren.com/makingfineprints1A.html

ValantarThat article is from 2005 and concerns CRT monitors. LCDs work differently and must thus be adjusted differently. The brightness controls of an LCD affects its black level, but only indirectly as the black level rises as the backlight brightens. Contrast controls on an LCD do not affect the intensity of the backlight and as such can't affect brightness in any meaningful manner.