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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
Yes, it's the LCD refreshing - it inverts itself every so often in order to avoid 'Ghosting' which happens if the panel stays in the same state too long. I think it's more noticeable under polarised light.
When the backlight turns on it's much more noticeable so the refresh rate goes up far faster (but then the power usage isn't a big deal). To keep the power usage down normally the refresh has to be done at a reasonably low rate.