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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Just to add that you could also be having some electrical issues if you get flickering - I think there's a note on the WS2811 page about using a pullup resistor and putting SPI into Open Drain mode? It might be needed if you're running the panel off a separate 5v supply.
... finally I don't know if Glediator handles the zig-zag pattern of the LEDs? It could be a pain to try and re-order them quickly. About the only thing I can think is to use
GraphicswithdrawImageof the image data you received.