If your monitor is off it projects nothing so why can’t they just project nothing for black?
In: 11
that’s exactly what they do. There are two types of screens: LED and LCD. The first one produces color by turning on very small lamps for every pixel of the screen, the brighter the color the brighter it shines. For example red will be full red lamp, green lamp off and blue too, while black would be all off.
For LCD screens it’s a bit more complicated. Basically the screen is illuminated from the back by a single lamp, and every color pixel is a liquid crystal that “opens or closes” more depending on the amount of light that should go through. For black it doesn’t allow for any light to pass through, so it’s just as if it were off. But obviously in this case the main light can’t be turned off or everything else on the screen would be black too.
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