Hearted Youtube comments on Technology Connections (@TechnologyConnections) channel.

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  29. Yes, that's what google says a pixel is, and it's an incomplete definition. They key point of what a pixel is has to do with being individually manipulated. As demonstrated with the shadow mask, the electron gun does not give a lick whether it actually falls on a phospher or not. That is a huge difference. I can turn on pixel 300,280 and give it an RGB intensity of 2A7033 on a digital display. It will happily do so. The best an CRT display can do is vary the intensity of it's beam on line 280, after a certain period of time past the h blank and hope the phosphors that get lit are visible through the mask. That's why old school consoles are in such lockstep with the crt's rate of refresh. The console knows what it put out the field previously, and some can know whats in the next field, but it could only guess what is sitting under the beam and being lit by use of registers that count what line the display is currently drawing and another counter that tracks to the hblank. From there it could "address" individual parts of the screen and know what should be displayed there. I say should because the console couldn't actually know what's there, it just knows what it is attempting to paint there. This is most telling in the atari where bits of the play field aren't displayed because the cpu had to take over to run the program code during the h blank, for a brief moment the tv had no information as to what to do with the electron gun and thus didn't fire until the display routine took over. In modern displays, I can look at the digital output and know the exact location and intensity of every dot on the screen. They are pixels, and can be directly manipulated.
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