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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.
@d3nd3-o0
It might be because its a "Memory In Pixel" type display. I assume this means that it retains the last pixels like an always on type of thing. A simple
Bangle.on('lcdPower', function(on) { if (!on)g.clear() });should do the job. Can save it as alcdoff.boot.jsfile, then delete it if you don't like.