Linked by Howard Fosdick on Tue 2nd Aug 2011 22:18 UTC
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Member since:
1997-10-01
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.