If you need to make just a few black pixels, you can't just turn off the backlight in that area, so the backlight is always on and we just block light for those few pixels) (This might make you ask "Why?", but remember that the backlight does not have as fine-grained control as the pixels themselves. When an LCD is black, it is doing full light output, and then also blocking all of that light to create the appearence of black. Most LCD devices use a backlight which is always on. This depends on the display technology being used.
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