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A big problem with an indexing color stripe scheme is that you can never have black in the image. If you did have a large black area in the image, you would lose track of which phosper stripe the beam is on at any given moment of time. When you exit the black area of the image, you wouldn't know what stripe the beam is currently on, and thus not know if you need R, G, or B at that point, to feed the electron gun.
So there is a minimum value of darkness, around 5% of peak white. Which makes the image look washed out.
This scheme would get rid of the convergence issue, and require less power for the very high voltage. But the minimum brightness problem, along with the shadow mask CRT already established, pretty much ended this.
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