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What about LED-backlit LCD ? Aren't they smart enough to selectively turn off some of the white LEDs when displaying black ?
Ah, can't wait until we have OLED and transflective screens everywhere
I believe that most LED backlights don't actually have a lot of LEDs behind the screen (known as "full array") that can be turned on and off, but rather have LED emitters at the edges of the screen that uniformly illuminate the area behind the LCD panel.
There is a technology known as "local dimming" that works like you describe, but it's only in high end TVs at this point. I don't know if anyone is making computer monitors with local dimming.