@nicole i have heard of experimental CRT that tried something like this with the 3,58 NTSC color carrier, but they were not anywhere practical Another technology that might find more use would be projection TV They would get a lot simpler replacing complicated color convergence circuits for three spatially displaced tubes with a scanning mirror for sequentially scanning them Cheapies might run a single white tube through a color wheel, just like a DLP projector does it today /Multipart