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One thing with wire-based aperture grilles: tapping the side of the monitor will make the wires in the aperture grille vibrate, throwing of the colors. So, if you want to emulate a Trinitron display really, really well, you need an acceleration sensor and, for good measure, a microphone (to detect loud noises at the right frequency to make the wires vibrate)

I also have a question some reader might be able to answer: if you do the simple implementation, (at least) 2/3rds of your electrons will hit the aperture mask. To improve power efficiency, you would need finer control over the video signal. did any television ever do that? Or did they already have to do it to prevent the electron beams for different color from interfering with each other?

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