You cod try it whith LEDs audioguru get an red,greed and blue LED and focus them in the same spot on paper then try thurning them on in difrent combinations and you will get difrent colors.
This only simulates the color.Each color has its own freqency.The flourescent light bulb tricks you this way too it aculy emits red, green, blue and a litle ultraviolet.At night thurn on an flurescent light blub and watch a CD.You will only see the colors i menthond before.The UV light is not suposed to be emited.This escapes.Flourecent lights have mercury steam in them and this makes UV light wen ionized.This UV light makes the red ,green and blue phospor on the glass glow.
Thats how the worlds first white LED was made.It containd an red,green and blue LED chip that made it apear white.After that the true white LED was invented that used an single chip that made white light.
Almost evryting that works whith color is based on the red,green and blue.TVs,PC monitors,color LCDs,cameras,our eyes...
If you have an strong magnefing glass you can see those Red,Green and Blue pixels on the TV.(You will hardly see it on your PC monitor since there too small)