here's a couple projects I've done with an LED matrix marquee
RetroPie based ==>https://www.instructables.com/id/Vertical-Bartop-Arcade-With-Integrated-PIXEL-LED-D/
PC Based ==>https://www.instructables.com/id/Arcade-Machine-With-Changing-LED-Marquee/
Here's a guide for setting up this LED marquee and RetroPie ==>http://ledpixelart.com/files/retropie/ .
Runcommand onstart and onend is used here. When a new game is launched, a script runs which passes the rom name to the LED marquee software (http://pixelcade.org) which is then displayed on the panels. Both still image PNGs and GIF animations can be displayed by game.
This project also includes artwork that has been manually re-mastered for 128x32 for that classic 8-bit look. Disclaimer, I'm the creator for this project and sell these as kits.
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