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Nov22-10, 10:01 PM
P: 474
And PAL is perfection at last.

To answer the OPs questions, yes the TV screen only generates three colors red,green,blue - not exactly single wavelengths because the dyes used in the filters aren't perfectly monochromatic - but the theory is the same.
Our eyes have three color receptors and our brains can generate any color we can see from the relative brightness of these three

Although because our eyes color response and the TV standard RGB don't quite match up there are colors that we can see which you can't perfectly reproduce on a screen