not sure, if it works this way today, but imagine there are 3 layers of lcd displays over each other. each filters a prime color, normaly red, green and blue, that means that it only let those colors through. the computer sends a set of three values to the monitor, that tell, how much a color shall be filtered. if you got a green point, it would be red 50, green220, and blue 50. much more green light comes through the filters so the point is green.
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