If your monitor is off it projects nothing so why can’t they just project nothing for black?
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There are to main parts to your normal display: the LED screen and the backlight. The LEDs are what provide all the pixels and colors for your image. The backlight is what illuminates them so the user can actually see them. In most monitors and TVs, backlights are always on and cover the entire screen all at once. This is why, even if the pixels are black and turned off, you see illumination.
Some newer monitors have localized illumation zones. The more zones, the more granular the illumination, and black effect. Some companies are even working on each pixel illuminating for itself, which results in a drastic change of perception of blacks for the user.
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