There is a foldable LED screen at CES this year that works similar to how you describe but 4 panels horizontally. The four panels fit so well that no join is visible.
https://youtu.be/A5bHCXRxAMg?si=AYEJ_HC5nFrjQHps
There is a foldable LED screen at CES this year that works similar to how you describe but 4 panels horizontally. The four panels fit so well that no join is visible.
https://youtu.be/A5bHCXRxAMg?si=AYEJ_HC5nFrjQHps