We had a old LED panel on the electronics benches, it’s been there for ever and I decided to give it a shot, after some fumbling with the raspeberry pi RGB panel library I managed to make it work, if anyone has any of these around, this is the setting :
demo --led-rows=32 --led-cols=32 --led-chain=2 --led-multiplexing=2
it’ s basically 32x32 panels side by side with multplexing.