LED back lighting better for darker blacks on monitors?

[second.exodous]

I thought I would ask this question here since people that made this game and play-tested it probably are into horror games and like the darkness dark

I have a normal LCD display that functions like every other LCD display, the blacks are not all that black when playing a game that takes place in a darkened environment. They still give off lots of light making black look gray when it is the predominate color on the screen. I have heard that when the lighting is done with LEDs the blacks are much darker. I was thinking of getting a new monitor for this game and watching movies on as horror is my favorite genre and black is just are not dark.

So does anyone have any experience with this? Does LED back-lighting really make that much of an impact on black? LED TVs/monitors are new so I can't really go to a store to test it out and even if I could it would have to be in a darkened room to test it out anyway.