Completely random question about those new-fangled scoreboards

I believe they're LED, but don't shoot me if they're not. Generally they have red numbers, although sometimes yellow.

Does anyone know why parts of the numbers disappear when they're shot through a lens? Seems like it happens with both still and video cameras.

Here's an example of what I mean:

No idea why I'm posting this here. It's just always confused me.

 

They're trying to give photographers seizures.

 

Could part of it be the same reason a line shows up on a computer screen when shot through a still or video camera?

 

Or why your TV has lines running through it when you videotape it?

 

I think that's it. Rather than glowing continuously like a light bulb, I believe that LEDs blink on and off very rapidly. If they happen to be off when the camera scans them, it won't see them. Then if they're on when the camera scans them for the next frame, it will see them.