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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.
@allObjects
...this thread has a more recent, nice follow up that applies some of the 'implied' lessons learned:
use a led matrix 5x7 without driver chip?
Most prevalent is the use of Espruino Graphics' option to store bits vertically or cover (part of) columns in bytes vs part of rows (columns scattered over multiple buffer bytes)... It though all depends on how the LED matrix is built and has to be driven...
Graphics.createArrayBuffer(<withInPixels>,<heightIn8sOfPixels>,1,{vertical_byte:true});