I wonder if modern tech could correctly illuminate vertical #RGB phosphor stripes (as in the #Trinitron) on a #CRT with a single electron gun and no shadow mask. This was a Hard Problem™ when color TV was first being invented. The shadow mask and aperture grille were invented to solve the problem by stopping the beams from hitting the wrong color. But now we have gigahertz-speed electronics. Could those modulate the beam with precise enough timing to not need a shadow mask or aperture grille?