Why do those moving black bars appear when trying to take a photo of an older tv or computer screen? And not on modern ones?
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Old TVs work sort of like ripples on water. So a special tool sends a ripple or a “beam” through the entire screen and then each dot (pixel) on the screen lights up to a certain colour as directed by this beam.
This beam is the black bar that the camera sees. The reason why you don’t see it with your eyes is because the camera doesn’t yet see the next beam after the first one faded. The see the fade which is the black line whereas our eyes would’ve picked the next one.
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