Join Date: Jul 2005
Location: Nothern Pennsylvania,USA
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They are definitely NOT black and white CRT's, with colored lenses on them. They are monochrome(single-color) CRT's. 1 each R,G,and B. Each CRT has its own specific type phosphor, which when exited by the cathode ray, emits the proper color. Some projectors have color filtering, either in the lenses or glycol, but this is only to isolate the intended color further, therefore refining color output. Even in the color filtered models, each CRT still produces the appropriate color.
If each CRT was grayscale(black and white), with color filters in front, our lives would be MUCH easier. Unfortunately though, the strength of color filter needed would greatly reduce light output, and probably not display color correctly across the entire luminance range. Also running gray light through a colored filter would not result in the correct color. Another point would be that the tubes would have to be driven so hard to produce decent light output through the filters that they would NOT last long before wearing beyond use. I am sure there are other reasons but these are the top ones I can think of.
1272 stack coming soon!:)