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Originally Posted by old_tv_nut
I suspect the 3 color filters are not plain red,green blue, but are polarized somehow - one LCD then switches transmissions between red and cyan, and the other between blue and yellow.
Red+yellow --> red
cyan+yellow--> green
cyan+blue--> blue
red+blue - not useful - black or nearly so
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But how can you get only cyan+yellow, if red is inline with the other two filters? Dito on the other combinations. Their graphic shows all three filters stacked on top one another in front of the crt face.