Idk if it’s clear but I watched many sports game at night and the spotlights were flickering only during slow motion shots
In: Technology
* LED signs are made up of millions of individual LEDs.
* Each of those LEDs needs to get power.
* However it would be far too costly to have each LED get its own power driver circuit.
* So instead they share them in batches and rapidly switch which batch is getting power.
* To the human eye, the switching is so fast that you would never know that not all the LEDs are getting power at the same time.
* But when played back in slow motion, it’s clear that the LEDs turn on/off in waves.
* Some others have claimed it’s due to AC power changing direction many times a second, but LEDs are driven with DC power so the flickering is un-related.
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