[cbm-vic-20]

TIL about "Charlieplexing", or how to use a reduced set of pins to drive a matrixed set of LEDs.

https://en.wikipedia.org/wiki/Charlieplexing

[jacquesm]

That's going to be funny when you try to make a photograph on a short shutter time. Half the display will be off!

[Liftyee]

True, but doesn't this apply to regular matrixed displays as well?

[satiated_grue]

Super common technique. Aircraft cockpit videos usually exhibit stroboscopic effects because of the scan rate of the camera and the refresh rate of the displays, and those are very expensive devices. Short shutter time photos are just not a case I think most displays are designed for.

[mmastrac]

A significant number of consumer electronic devices (especially reduced-cost ones) already do this. I have yet to see an alarm clock that isn't at least matrixed...