For a custom display, I am looking for strips of fully addressable LEDs (WS2813 or similar) in a fine-pitch arrangement. 144 LEDs/m seems to be the maximum for the common 5x5 mm² package. But that's pushing it for my application; I would prefer 200 LEDs/m or more. Lower brightness and smaller source diameter would be fine.
Are there similar products in smaller packages and higher packing densities which I have overlooked? Thanks for any hints you might have!